Boosting ABS with N-Phenylmaleimide Enhancing Heat Resistance and Durability

In the world of polymers, creating materials that are not only robust but also resistant to high temperatures is increasingly important. One such innovation that has gained popularity, especially in ABS (Acrylonitrile Butadiene Styrene) applications, is the use of N-Phenylmaleimide (N-PMI). With its unique properties, N-PMI manufactured by Yangchen Tech serves as a powerful heatresistant modifier, pushing the boundaries of what ABS can achieve in various demanding environments. Let’s dive into the specific applications of N-PMI in ABS and discover why this compound is an industry favorite.

 

N-phenylmaleimide

Basic Information

 

Chemical Structure N-phenylmaleimide
Chemical Formula C10H7NO2
CAS No. 941-69-5
Molecular Weight 173.16
Packing Type Paper bag (20 kg)

 

Why Use N-Phenylmaleimide in ABS?

 

ABS is a versatile thermoplastic known for its strength, toughness, and ease of processing. However, its performance can be compromised in hightemperature environments. N-Phenylmaleimide (N-PMI) is a gamechanger here, offering exceptional thermal stability that significantly enhances the heat resistance of ABS. When incorporated into ABS, N-PMI improves the polymer’s ability to withstand higher temperatures without losing structural integrity.

 

Applications of Resin Modifiers

 

 

Resins Function Applications
Styrenic Polymers (ABS, ACS, AES, AAS, etc.) Improves heat resistance and heat stability Vehicle parts, light electrical appliances
PVC Improves the heat resistance of PVC-ABS compounds Housing for televisions, office devices, etc.
PMMA Improves the heat resistance of acrylic resins Optical disc substrates, optical fibers, lighting equipment parts
Polymer Alloys Modifies PA, PC, PBT Vehicle parts, household electrical appliances parts, office devices
α-Olefin
(Maleic Anhydride, N-Phenylmaleimide Copolymer)
  Water-soluble hot-melt adhesives, honeymoon adhesives
Phenolic Resins Improves heat resistance Heat-resistant adhesives of printed-circuit boards

 

Applications of Resin Modifiers

Key Benefits of N-PMI in ABS HeatResistant Modifiers

 

1. Enhanced Thermal Stability:  

N-PMI’s chemical structure allows ABS to maintain its mechanical properties at elevated temperatures. By incorporating N-PMI, ABS can withstand temperature stresses, maintaining its durability and shape without softening or warping. This makes N-PMImodified ABS ideal for applications where temperature resistance is critical.

 

2. Improved Mechanical Strength:  

One of the significant challenges of heat exposure is the potential for a polymer to become brittle. N-PMI helps counteract this by enhancing the stiffness and impact strength of ABS. Products made with N-PMImodified ABS exhibit increased toughness, even in highheat scenarios, making them suitable for applications requiring both strength and heat resistance.

 

3. Color Stability at High Temperatures:  

ABS tends to discolor or yellow when exposed to high temperatures. N-PMI addresses this issue by enhancing the color stability of ABS, ensuring that products retain their original appearance. This is particularly beneficial in applications where aesthetics are important, such as automotive interiors, electronics, and home appliances.

 

4. Improved Chemical Resistance:  

N-PMI also enhances the chemical resistance of ABS, providing better durability against oils, solvents, and other chemicals. This feature is advantageous in environments where materials are exposed to both heat and potentially aggressive chemicals.

 

Applications of N-PMI in ABS Based Products

 

N-PMI manufactured by Yangchen Tech modified ABS is suited for a wide range of high-performance applications across industries:

 

Automotive Parts: From engine covers to internal parts near heat sources, automotive components require heatstable materials. N-PMImodified ABS resists deformation and discoloration, even under highheat conditions, making it ideal for underthehood applications.

 

Consumer Electronics: ABS modified with N-PMI is widely used in electronics housings, including for laptops, smartphones, and other devices that generate heat. The stability and color retention provided by N-PMI are essential for electronics, where functionality and appearance are both important.

 

Home Appliances: Kitchen appliances, where heat and chemical exposure are common, benefit from the added resilience and durability of N-PMIenhanced ABS. The materials maintain strength and appearance, even under frequent hightemperature use.

 

Industrial Equipment and Tools: For equipment parts and tools that encounter high temperatures, modified ABS offers a balance of toughness, stability, and heat resistance, thanks to the properties imparted by N-PMI.

 

 

Why Choose N-Phenylmaleimide from Yangchen Tech?

 

At Yangchen Tech Factory, we are dedicated to providing the highest quality N-Phenylmaleimide for use as a heatresistant modifier in ABS and other thermoplastics. As a leading manufacturer, we ensure our N-PMI meets rigorous quality standards, ensuring high purity (99%) and excellent solubility. Our N-PMI products allow ABS to achieve superior heat stability, making it suitable for a broad spectrum of highdemand applications.

 

With a robust production capacity, Yangchen Tech Factory produces up to 2,000 tons of N-Phenylmaleimide annually. This allows us to fulfill both largescale and custom orders, offering global partners a reliable and consistent supply for their production needs. Our commitment to quality and customization has made us a trusted partner in the materials industry.

 

 

Partnering for a Stronger, More Heat-Resistant Future

 

N-Phenylmaleimide is revolutionizing the capabilities of ABS, providing the heat resistance and strength that industries demand. With Yangchen Tech Factory's premium N-PMI, manufacturers can unlock new levels of performance in their ABS products, whether for automotive, electronics, or industrial applications. As demand for more heatresistant materials grows, N-PMImodified ABS is paving the way for the next generation of highperformance plastics.

 

For inquiries or to learn more about our N-Phenylmaleimide and its applications, reach out to Yangchen Tech Factory. Let’s build stronger, more heatresistant solutions together!

FAQ of N-Phenylmaleimide Manufactured by Yangchen Tech

If you’re searching for a high-quality, high-performance heat-resistant modifier, look no further than Yangchen Tech’s N-Phenylmaleimide (N-PMI) CAS: 941-69-5. Known for its superior quality and purity, Yangchen Tech’s N-PMI is ideal for enhancing the heat resistance and performance of various resins, including ABS, PVC, and PMMA. Below are some frequently asked questions (FAQs) about our N-Phenylmaleimide, along with insights into why it is an essential component for your high-performance polymer needs.

 

 

1. What is N-Phenylmaleimide?

 

N-Phenylmaleimide (CAS: 941-69-5), also known as N-PMI, is a high-purity monomaleimide compound widely used as a heat-resistant modifier in high-performance polymers. This compound is highly effective in improving the thermal stability, durability, and overall performance of resins and thermoplastics. 

 

2. What are the key advantages of Yangchen Tech’s N-Phenylmaleimide?

 

Our N-Phenylmaleimide stands out due to its high purity and consistent performance:

  • High Purity: We ensure our product reaches a specification of 99.7% purity, allowing it to deliver optimal performance in industrial applications.
  • Good Solubility: Our N-PMI exhibits excellent solubility, making it easier to incorporate into various formulations, leading to a homogeneous and stable final product.
  • Good Liquidity: The liquid consistency of our N-PMI simplifies the blending process, ensuring uniform distribution within the polymer matrix.
  • Heat Resistance: By adding Yangchen Tech’s N-PMI, manufacturers can significantly enhance the heat resistance of materials like ABS, PVC, and PMMA.

 

Basic Infomation


 

Chemical Structure Structure formula of N-Phenylmaleimide
Chemical Formula C10H7NO2
Molecular Weight 173.16
CAS No. 941-69-5
Packing Type Paper bag (20 kg)

 

Specification


 

Property Limits Results
Appearance Yellow crystalline powder Yellow crystalline powder
Purity % >98 99.5
Melting Range ℃ >85 88~90

 

 

3. How can Yangchen Tech’s N-Phenylmaleimide improve my product’s performance?

 

When incorporated into resins, our N-PMI acts as a modifier that:

  • Enhances Thermal Stability: Ideal for applications where high temperatures are a concern, such as in the automotive, electronics, and industrial sectors.
  • Improves Mechanical Strength: It helps strengthen polymers, enabling them to withstand greater wear and tear.
  • Increases Compatibility in Blends: Its good solubility ensures smooth blending with various resins, resulting in a consistent, high-quality final product.

 

4. What are the technical specifications of Yangchen Tech’s N-Phenylmaleimide?

 

At Yangchen Tech, we pride ourselves on producing N-PMI that meets international quality standards. Here’s an overview of its specifications:

 

  • Purity: 99.7%
  • CAS Number: 941-69-5
  • Form: Liquid with excellent liquidity for easy handling and formulation
  • Solubility: High solubility in organic solvents for easy integration into resins like ABS, PVC, and PMMA

 

5. In which industries can I use Yangchen Tech’s N-Phenylmaleimide?

 

Due to its superior thermal stability, N-Phenylmaleimide is valuable across several sectors:

  •  Automotive: Ideal for creating durable, heat-resistant materials in automotive parts.
  • Electronics: Useful for high-performance electronic materials that require thermal resilience.
  • Industrial Applications: Excellent for specialty polymers and thermoplastics requiring stability under extreme conditions.

 

6. Why choose Yangchen Tech’s N-Phenylmaleimide over other suppliers?

 

Yangchen Tech is a leader in the development and production of N-Phenylmaleimide. Here’s why our customers prefer us:

  • Uncompromised Quality: We adhere to strict quality control measures to ensure our N-PMI meets industry standards.
  • Customization Options: We offer customized solutions to meet the unique requirements of your applications.
  • Global Reach: With years of experience in foreign trade, we provide reliable service to clients worldwide.

 

7. How can I order N-Phenylmaleimide from Yangchen Tech?

 

To get a quote or learn more about how our N-Phenylmaleimide can meet your industrial needs, please contact us through our website. We’ll be happy to provide further information on pricing, shipping options, and any custom requirements.

 

Yangchen Tech’s N-Phenylmaleimide is a trusted choice for manufacturers seeking a high-purity, high-performance heat-resistant modifier. With good solubility, excellent liquidity, and a 99.7% purity standard, our N-PMI is designed to enhance the heat resistance, stability, and performance of your products. Connect with us today to learn how Yangchen Tech’s N-Phenylmaleimide can support your industrial requirements.

 

 

N-phenylmaleimide (N-PMI) 99% Purity The Ultimate Heat-Resistant Modifier for Advanced Materials

In today’s rapidly evolving world of advanced materials, high-performance additives play a pivotal role in enhancing product durability, heat resistance, and overall functionality. If you are in the market for a premium heat-resistant modifier, N-phenylmaleimide (N-PMI) stands out as the go-to solution for a wide range of industrial applications.

 

N-phenylmaleimide

 

Why Choose N-Phenylmaleimide (N-PMI) manufactured by Yangchen TECH for Heat Resistance?

 

N-PMI (CAS: 941-69-5) is an exceptional monomaleimide compound known for its high purity—up to 99.7%—and outstanding solubility. This compound is a game-changer for manufacturers aiming to enhance the thermal stability of plastics, polymers, and other advanced materials. With its superior heat resistance, N-PMI is the ideal choice for industries requiring durable, long-lasting materials that can withstand extreme conditions.

 

Basic Infomation


 

Chemical Structure Structure formula of N-Phenylmaleimide
Chemical Formula C10H7NO2
Molecular Weight 173.16
CAS No. 941-69-5
Packing Type Paper bag (20 kg)

 

Specification


 

 

Property Limits Results
Appearance Yellow crystalline powder Yellow crystalline powder
Purity % >98 99.7
Melting Range ℃ >85 88~90

 

Key Features of N-PMI:

 

1. Purity Up to 99.7%: The extremely high purity of our N-phenylmaleimide ensures consistency and top-notch performance in every application.

2. Good Solubility: A crucial characteristic that distinguishes N-PMI is its excellent solubility, making it easier to integrate into various material systems without compromising on performance.

3. Heat Resistance: As a heat-resistant modifier, N-PMI significantly improves the thermal stability of polymers and resins, helping them endure high temperatures without degradation.

4. Versatile Applications: This compound can be used in a wide variety of fields, including automotive, electronics, and aerospace industries, where advanced materials are critical for success.

 

The Competitive Edge of Using N-Phenylmaleimide (N-PMI)

 

By incorporating N-PMI into your production process, you are ensuring that your materials benefit from both superior heat resistance and processing efficiency. Its good solubility ensures smooth integration, reducing the risk of clumping or uneven distribution. Whether you're working with plastics, coatings, or adhesives, N-PMI's chemical properties provide unmatched reliability.

 

Enhance Your Products with Yangchen Tech’s N-PMI

 

At Yangchen Tech Factory, we pride ourselves on being industry leaders in providing cutting-edge solutions like N-phenylmaleimide (N-PMI). Our products are meticulously produced to meet the highest quality standards, ensuring that you receive a high-purity, heat-resistant modifier that performs consistently across applications.

 

Upgrade your materials with N-PMI and experience the difference that 99.7% purity and good solubility can make. Our dedicated team is ready to provide customized solutions tailored to your unique needs, helping you optimize the performance of your advanced materials.

 

Contact Us Today  

For more information on our N-phenylmaleimide (N-PMI), or to discuss how our products can improve your manufacturing processes, visit our website or reach out to our team directly. Let us help you push the boundaries of what's possible with advanced materials.

 

Unlocking the Potential of N-Phenylmaleimide A Versatile Solution from Yangchen Tech

At Yangchen Tech, we pride ourselves on producing high-quality N-phenylmaleimide (N-PMI), a vital compound that serves as a building block in various advanced applications. With its exceptional properties, N-PMI is increasingly recognized for its role in high HDT thermoplastic resins, paints and coatings, adhesives, and more. Let’s delve into the diverse applications of N-phenylmaleimide and discover why it’s an essential ingredient in numerous industries.

 

N-phenylmaleimide

 

Basic Infomation


 

 

Chemical Structure Structure formula of N-Phenylmaleimide
Chemical Formula C10H7NO2
Molecular Weight 173.16
CAS No. 941-69-5
Packing Type Paper bag (20 kg)

1. High HDT Thermoplastic Resins

N-phenylmaleimide is renowned for enhancing the heat distortion temperature (HDT) of thermoplastic resins. By incorporating N-PMI, manufacturers can achieve superior thermal stability, making it ideal for applications that demand durability under heat. This property is crucial in automotive, aerospace, and electrical components, where high-performance materials are essential.

2. Paints and Coatings

In the paints and coatings industry, N-PMI acts as a key additive that improves the overall durability and chemical resistance of formulations. Its excellent adhesion properties ensure that coatings maintain their integrity, even in harsh environmental conditions. This makes it a favored choice for both industrial and consumer applications, providing long-lasting finishes.

 

N-phenylmaleimide

3. Adhesives

Adhesives formulated with N-phenylmaleimide benefit from enhanced heat and chemical resistance, making them suitable for demanding applications. From automotive assembly to construction, N-PMI improves the bond strength and longevity of adhesive formulations, ensuring reliable performance under stress.

 

Specification


 

 

Property Limits Results
Appearance Yellow crystalline powder Yellow crystalline powder
Purity % >98 99.5
Melting Range ℃ >85 88~90

 

4. Pharmaceutical and Agrochemical Intermediates

N-phenylmaleimide is also utilized in the production of pharmaceutical and agrochemical intermediates. Its reactivity allows for the synthesis of various compounds, contributing to the development of effective drugs and crop protection products. This versatility highlights its importance in both the healthcare and agricultural sectors.

5. Bactericides and Fungicides

The antimicrobial properties of N-PMI make it a valuable component in the formulation of bactericides and fungicides. By enhancing the efficacy of these products, N-PMI contributes to effective pest control in agriculture and hygiene products, helping to protect crops and maintain health standards.

6. Underwater Organism Repellents

N-phenylmaleimide is also applied in formulations designed to repel underwater organisms. Its chemical structure offers enhanced resistance to biofouling, making it ideal for marine applications. This property is especially beneficial for coatings used on ships and underwater equipment, reducing maintenance costs and improving performance.

7. Rubber Vulcanization Modifiers

In the rubber industry, N-PMI acts as a vulcanization modifier, improving the thermal and mechanical properties of rubber compounds. This results in enhanced durability and heat resistance, making it suitable for automotive tires, seals, and gaskets, where performance is critical.

8. Photosensitive Resins

N-phenylmaleimide is widely used in photosensitive resins, particularly in photolithography processes. Its ability to undergo polymerization upon exposure to light allows for precise patterning in electronics and semiconductor manufacturing, facilitating the production of high-tech components.

9. Insulating Varnishes

Finally, N-PMI is an essential component in insulating varnishes used in electrical applications. Its thermal stability and electrical insulation properties protect components from heat and electrical stress, ensuring the reliability and safety of electrical systems.

Why Choose Yangchen Tech's N-Phenylmaleimide?

At Yangchen Tech, we are committed to delivering high-quality N-phenylmaleimide with exceptional purity and consistency. Our advanced manufacturing processes ensure that our product meets stringent industry standards, providing our customers with the reliability they need. Whether you’re in the automotive, pharmaceutical, or coatings industry, our N-PMI can enhance your formulations and improve product performance.

N-phenylmaleimide is a versatile compound with applications spanning numerous industries, from high HDT thermoplastic resins to paints, adhesives, and beyond. As a trusted manufacturer, Yangchen Tech is dedicated to providing innovative solutions that meet the evolving needs of our customers.

What is PVC Heat Stabilizer?

What is PVC Heat Stabilizer? —— A Professional Insight into Performance and Applications

 

Polyvinyl chloride (PVC) is one of the most versatile polymers, widely used in industries ranging from construction to consumer goods. However, PVC is highly susceptible to degradation when exposed to heat, light, or processing stresses. To combat this, PVC heat stabilizers manufactured by Yangchen Tech play a crucial role in preserving the material’s integrity and extending its useful life. 

In this blog, we’ll dive deep into what PVC heat stabilizers are, their critical performance features, and how they’re applied across industries. Additionally, Yangchen Tech, a leader in advanced material solutions, manufactures high-performance PVC heat stabilizers designed to meet the most demanding industrial standards.

 

What is a PVC Heat Stabilizer?

 

PVC heat stabilizer is an additive used to protect PVC from thermal degradation during both processing and its operational life. PVC is sensitive to heat, and without a stabilizer, the material can decompose, releasing hydrochloric acid (HCl), which accelerates further degradation. This leads to discoloration, loss of mechanical properties, and poor product performance.

PVC heat stabilizers neutralize the acidic by-products, slow down the degradation process, and ensure that the PVC material retains its color, flexibility, and strength, even when exposed to high temperatures.

 

PVC Heat Stabilizer

 

Key Performance Features of PVC Heat Stabilizers

 

1. Thermal Stability

   The primary function of a PVC heat stabilizer is to provide thermal stability. During high-temperature processing methods like extrusion, molding, or calendaring, PVC would degrade quickly without a stabilizer. By slowing the breakdown of the polymer, heat stabilizers ensure that PVC retains its mechanical and aesthetic properties throughout its lifecycle.

2. Long-term Durability

   Heat stabilizers not only provide protection during processing but also improve the long-term durability of PVC products. Whether used in construction materials like pipes and window profiles, or consumer products such as vinyl flooring, stabilizers help maintain the structural integrity of the material over years of exposure to varying environmental conditions.

3. Color Retention

   One of the visible signs of PVC degradation is discoloration. Heat stabilizers play a critical role in maintaining the product’s color by preventing the oxidation and breakdown of the polymer, which often leads to yellowing or fading of PVC materials.

4. Mechanical Performance

   By stabilizing the material at the molecular level, heat stabilizers ensure that PVC products maintain their flexibility, toughness, and impact resistance, even when subjected to prolonged exposure to heat or UV light.

 

Basic Infomation

 

 

Test Item Test Standards Test Data
Molecular weight and distribution GPC Mw=12~16*104.PDI=2.0~3.0
Glass transition temperaturehttps://www.yangchentech.com℃ DSC 160~210℃(Adjustable)
Initial decomposition temperaturehttps://www.yangchentech.com℃ TGA 395-405℃
Density  ASTM-D792 1.00~1.15ghttps://www.yangchentech.comcm3
Appearance NG Off-white powder

 

Applications of PVC Heat Stabilizers

 

1. Construction Industry

   PVC is widely used in the construction industry for products like pipes, window frames, and roofing membranes. Heat stabilizers are essential to ensure that these materials can withstand outdoor conditions, temperature fluctuations, and long-term use without degrading or losing their structural properties.

2. Electrical and Cable Insulation

   PVC’s excellent insulating properties make it ideal for electrical wiring and cable insulation. However, these applications often require the material to be heat-resistant to avoid failure in high-temperature environments. PVC heat stabilizers ensure that cables maintain their insulating properties, flexibility, and durability even in harsh conditions.

3. Packaging Industry

   In the packaging industry, PVC is used for films, containers, and bottles. Heat stabilizers are crucial for maintaining the clarity and mechanical strength of PVC packaging materials during both manufacturing and storage, preventing warping or cracking under varying temperatures.

4. Automotive Sector

   PVC is often used in the automotive industry for dashboards, door panels, and seals. These applications require high heat resistance and mechanical durability, both of which are ensured by the use of effective heat stabilizers.

 

Why Choose Yangchen Tech for PVC Heat Stabilizers?

 

At Yangchen Tech Factory, we specialize in developing advanced PVC heat stabilizers tailored to meet the needs of various industries. Our expertise in material science, combined with state-of-the-art manufacturing capabilities, ensures that we deliver products that offer superior performance and consistency.

 

Workshop of Yangchen Tech

  • Workshop of Yangchen Tech
     

     

     

    Here’s what sets Yangchen Tech apart:

     

    - Innovative Formulations: Our team of experts continuously innovates to create customizable stabilizers that meet specific application requirements, whether for construction, automotive, or consumer goods.

    - Eco-friendly Solutions: We are committed to providing sustainable solutions, and our range of lead-free and Ca-Zn stabilizers is designed to align with global environmental standards.

    - Uncompromising Quality: Rigorous quality control measures at every stage of production ensure that our PVC heat stabilizers perform reliably under the most challenging conditions.

    - Technical Support: At Yangchen Tech, we believe in providing more than just a product; we offer technical consultation and support to ensure that our solutions integrate seamlessly into your production processes.

     

    Our Warehouse

     

    • Yangchen Tech's warehouse
       

       

       

      PVC heat stabilizers are indispensable in ensuring that PVC products perform well under heat stress and maintain their durability over time. With thermal stability, color retention, and mechanical performance being key factors, Yangchen Tech's advanced PVC heat stabilizers stand out as industry-leading solutions for manufacturers worldwide.

      For more information or to inquire about our custom solutions, contact Yangchen Tech Factory today and discover how we can help elevate the performance of your PVC products. Let us be your trusted partner in ensuring heat resistance and long-lasting quality.

      Surface Modification of Aluminum Nitride (AlN) Powders

      Aluminum nitride (AlN), with the chemical formula AlN, is a covalent bonded nitride consisting of [AlN] tetrahedra as structural units. It belongs to the hexagonal crystal system and has characteristics such as low molecular weight, strong atomic bonding, simple crystal structure, and high lattice vibration coordination.

       

      Due to the unique crystal parameters, AlN exhibits excellent properties such as high thermal conductivity, high strength, high volume resistivity, high insulation withstand voltage, low dielectric loss, and a thermal expansion coefficient that matches silicon. These properties make AlN an ideal material for high thermal conductivity ceramic electronic substrates and packaging materials. It is often considered the most ideal electronic substrate material.

       

      Tip 1: Thermal Conductivity and Other Applications of AlN

       

      The theoretical thermal conductivity of AlN single crystals is 320 W/(m·K), while the thermal conductivity of polycrystalline AlN ceramics can range from 140 to 200 W/(m·K), which is approximately 10 times that of conventional resin substrates and alumina ceramics. In addition, AlN has a direct bandgap structure and can theoretically emit light across a wide range of wavelengths, from deep ultraviolet to deep infrared. It is an indispensable material in GaN-based light-emitting diodes, field-effect transistors, and other devices.

       

      1. Why Modify the Surface of Aluminum Nitride Powders?

      The surface of AlN powders is highly reactive and easily reacts with moisture in the air. AlN initially transforms into an amorphous AlOOH phase, which may further convert into Al(OH) under certain temperature, pH, and ion activity conditions. This leads to the formation of Al(OH) or AlOOH (aluminum hydroxide) films on the surface of the powders. The increase in oxygen content significantly reduces the thermal conductivity of AlN ceramics. Due to this characteristic, handling, storage, transportation, and post-processing of AlN powders can be problematic.

       

      Tip 2: Methods for producing Aluminum Nitride Powders

       

      The primary methods for producing high-purity, fine-grained, and narrowly distributed AlN powders include the direct nitridation of aluminum powder, the carbothermic reduction of aluminum oxide, self-propagating high-temperature synthesis (SHS), chemical vapor deposition (CVD), and high-energy ball milling. Industrial production mainly uses the first two methods, while the others are primarily employed in experimental research.

       

      Tip 3: Methods for Determining the Hydrolysis Degree of AlN Powders

       

      The degree of hydrolysis of AlN powders can be determined through various techniques, including X-ray diffraction (XRD) analysis to examine phase changes, scanning electron microscopy (SEM) to observe changes in the shape of AlN powder particles before and after hydrolysis, and transmission electron microscopy (TEM) to analyze the crystal structure of the products. Additionally, the hydrolysis degree can be determined by monitoring the ammonia gas produced during hydrolysis, which results in the formation of NH₄⁺ and OH ions, leading to changes in the pH of the solution.

       

      Moreover, the primary forming method for AlN-based ceramic substrates, often referred to as the "king of ceramic substrates," is the slip casting method. This method is efficient and cost-effective. However, the hydrolysis of AlN powders severely hinders the development of water-based slip casting processes for AlN ceramics. Non-water-based slip casting methods, while viable, are expensive, lead to poor uniformity of samples, and generate organic vapors that cause environmental pollution.

       

      In addition, new applications of AlN, such as in thermally conductive plastics and thermally conductive adhesives, require AlN powders with improved hydrolysis resistance, compatibility with organic materials, and low interface thermal resistance.

      Thus, improving the hydrolysis resistance and stability of AlN powders has become a hot topic in research on surface modification methods for AlN powders. The following will briefly explore the methods of surface modification for AlN.

       aluminum nitride powder of Xiamen Juci

      2. Surface Modification Methods of Aluminum Nitride (AlN)

       

      There are various surface modification techniques for AlN powder, with the basic principle being to perform physical adsorption or chemical treatment on the powder's surface. This results in the coating of AlN particles or the formation of a thin reactive layer, preventing AlN powder from hydrolyzing when it interacts with water. The main methods include coating modification, surface chemical modification, and heat treatment, among others.

       

      1. Coating Modification Method of AlN 

      Coating modification is a traditional method that has been applied for a long time. It involves coating AlN powder with inorganic or organic compounds to reduce or shield particle agglomeration. Furthermore, the coating generates steric hindrance, making it difficult for the particles to re-agglomerate, thus achieving surface modification. The modifiers used for coating include surfactants, inorganic materials, dispersants, etc.

       

      a. Surfactant Method

      Surfactant modification relies on the surface charge characteristics of AlN particles. By adding cationic or anionic surfactants, the interfacial tension between the powder dispersion system (gas-liquid, solid-liquid) is altered, and a coating layer is formed on the powder surface with carbon-oxygen chains extending outward. The surfactant's hydrophilic group can adsorb onto the solid surface, alter chemical reactivity, and lower surface tension, which can control the hydrophilicity, lipophilicity, and surface activity of the nanomaterial. This process modifies the surface properties of the powder or imparts new characteristics to the powder.

       

      This is reflected in three aspects:

       

      The hydrophilic group reacts with the surface group to form a new structure, which provides new activity to the powder surface.

      The reduction of the surface energy stabilizes the powder.

      The hydrophobic groups of the surfactant form steric hindrance on the surface, preventing powder re-agglomeration, thereby improving the dispersion of the nanomaterial in different media.

      Example: Research by Guo Xingzhong et al. found that AlN powder modified with organic carboxylic acids and polyethylene glycol showed no significant Al(OH)3 phase after soaking in water for 48 hours, indicating that the organic carboxylic acids coated the surface of the AlN powder, thereby preventing water molecules from eroding the AlN powder surface.

       

      b. Inorganic Coating Modification

      Inorganic surface modification of AlN powder involves depositing inorganic compounds or metals on the surface through specific methods to form a coating film or a core-shell composite particle, improving surface properties. This process utilizes physical or chemical adsorption principles to ensure that the coating material is uniformly attached to the coated object, forming a continuous and complete coating layer. The modified powder's surface then exhibits the properties of the coating material.

       

      c. Dispersant Method

      Dispersants, which have amphiphilic structures similar to traditional surfactants, use anchoring groups and solvated chains to replace the hydrophilic and hydrophobic groups of surfactants. The anchoring groups can strongly adsorb onto the particle surface through ionic bonds, covalent bonds, hydrogen bonds, or van der Waals forces, either at single or multiple points. The solvated chains are selected by varying the polymer monomer or adjusting the copolymer composition to regulate compatibility with the dispersion medium. Additionally, increasing the molecular weight of the solvated chain ensures the formation of a sufficiently thick space layer on the particle surface.

       

      When selecting dispersants, two main factors are considered:

       

      The polarity of the dispersion medium and its solubility for the solvated chains of the dispersant. Typically, a medium with a high ability to dissolve the solvated chain and a low ability to dissolve the anchoring group is preferred.

      The surface polarity, surface functional groups, and acid-base properties of the particles to be dispersed. Low-polarity particles require dispersants with multiple anchoring groups. Different functional groups have varying reactivity and interaction methods, and the absorption sites on the particle surface can select anchoring groups based on their acid-base properties.

       

      Surface Chemical Modification

       

      Surface chemical modification is accomplished through chemical reactions or adsorption between surface modifiers and the particle surface. Polymer long chains are grafted onto the surface of the powder, and the long chains containing hydrophilic groups in the polymer extend and form a steric barrier in aqueous media. This helps to disperse and stabilize the AlN powder in the medium, relying not only on electrostatic repulsion but also on steric hindrance, which is highly effective.

       

      The selection of surface modifiers must aim to lower the surface energy of the particles, eliminate surface charges, and reduce surface attraction. To achieve good surface modification, organic substances used for modification should also provide the maximum degree of wetting with the particles, forming a uniform and dense coating. This is primarily dependent on the physical and chemical adsorption of the organic modifier on the particle surface. Physical adsorption occurs through van der Waals forces, electrostatic attraction, and other physical interactions between the modifier and the particles. Chemical adsorption relies on the reaction between functional groups on the particle surface and the modifier to achieve the surface coating of the particles by the surfactant.

       

      Thermal Spray Method for Surface Coating of AlN Powder

       

      The surface properties of AlN particles differ significantly from those of organic matrices, and common surface chemical modifiers (such as organosilicon, titanates, and aluminates) are used to modify the surface of AlN to increase its compatibility with the matrix. After treatment, the powder exhibits strong non-wettability to water. These small particles, with their non-wetting nature, float in water like an oil film without sinking. Based on this phenomenon, the activation index is used to characterize the degree of hydrophobicity. A higher activation index indicates better hydrophobicity, while a lower index indicates poorer hydrophobicity. When the unmodified nano-AlN powder is strongly hydrophilic, it sinks entirely when in contact with water, resulting in an activation index of R = 0. The activation index R is defined as the mass of the floating portion of the sample divided by the total mass of the sample.

       Application of AlN filler

      Coupling Agent Modification of AlN

       

      A coupling agent is a compound that contains both a polar group that can react with the surface of inorganic particles and an organic functional group that can react with or be compatible with organic materials. The role of the coupling agent is that one end can bind to the surface of the powder, while the other end can strongly interact with the dispersion medium. This improves the affinity of AlN powder with polymer materials, facilitating the dispersion of the powder in the polymer matrix.

       

      Common coupling agents include the following types:

       

      a) Silane Coupling Agents: Organic silane coupling agents are the most commonly used and widely applied coupling agents. Their general structural formula is Y-(CH2CH2-Si)-X3, where n is typically 2-3. In this structure, Y is the organic functional group, such as vinyl, methacryloxy, epoxy, amino, or hydrophobic groups, and X is the functional group bound to the silicon atom. Silane coupling agents are often classified based on the X group, which includes types like hydrolyzed silane, peroxysilane, and polysilane.

       

      b) Titanate Ester Coupling Agents: These coupling agents are a new type developed by Kenrich Petroleum Company in the mid-1970s. They exhibit good modification effects for many inorganic particles.

       

      c) Aluminate Ester Coupling Agents: Aluminate ester coupling agents are a new class of coupling agents.

       

      b) Hydrophobization Treatment: Hydrophobization treatment involves selecting organic substances with hydrophobic groups (such as long-chain alkyl, aliphatic hydrocarbon, or cycloalkyl groups) to surround the surface of AlN powder. These hydrophobic groups firmly bond to the powder surface, resulting in a strong hydrophobicity.

       

      c) Surface Grafting Modification: Surface grafting polymerization is a chemical method that links high-molecular polymers to the surface of AlN powder, significantly improving the dispersion of particles in organic solvents or polymer matrices.

       

      d) Inorganic Acid Modification: Inorganic acids, such as phosphoric acid or mono-dihydrogen phosphate, are used to treat the surface of AlN powder. This treatment not only enhances the hydrolysis resistance of AlN but also improves the dispersion of the powder. The relationship between the suspension stability of AlN and time, as well as the stability of AlN in water, depends on the specific inorganic acid used.

       

      Heat Treatment Method

      The heat treatment method involves heating the powder to induce oxidation on its surface, forming a dense alumina protective film, thereby enhancing its hydrolysis resistance. Li Yawei and other researchers studied the effect of heat treatment on the hydrolysis resistance of aluminum nitride (AlN) in the temperature range of 700-1050°C in air. They found that AlN started to oxidize at 700°C in the air, and as the temperature increased, further oxidation occurred. At 1050°C, the AlN was completely oxidized. After heat treatment, the hydrolysis resistance of the AlN powder was found to be temperature-dependent, with the resistance decreasing as the water temperature increased.

       

      Other Modification Methods

      There are several other modification methods, such as high-energy treatments, ultrasound, and encapsulation, which can also be used to modify the surface of AlN powders. Typically, combining these methods with others yields better surface modification results.

       

      Factors Affecting the Surface Modification of AlN Powder

       

      Several factors influence the surface modification of AlN powder, such as temperature, time, and the amount of modifier used. The modifier works by interacting with the surface groups of the nano powder to achieve modification. However, the chemical structure of the modifier and the length of the molecular chains can impact the dispersion of the nano powder in the polymer matrix. The molecular weight of the modifier has a significant effect on surface modification. If the molecular weight is too low, the coating layer will be thin and unable to provide sufficient steric hindrance, leading to poor dispersion of the modified powder. On the other hand, a higher molecular weight modifier will form a thicker coating on the surface, which can better interact with the organic matrix, as shown in Figure 4.

       

      When using silane coupling agents to modify the surface of AlN powder, a small amount of anhydrous ethanol or other solvents is often added to accelerate the reaction between the coupling agent and the powder. However, the presence or absence of the solvent can affect the interaction between the AlN powder and the coupling agent.

       

      Reference: Baidu Wenku

      What is the safety knowledge of polyacrylamide?

      Polyacrylamide is a widely used chemical compound that has various applications in industries such as wastewater treatment, agriculture, mining, and paper production. While it is generally safe when handled properly, there are certain safety considerations to keep in mind when working with polyacrylamide. Here are some important safety knowledge points:

       

      1. Personal Protective Equipment (PPE): When handling polyacrylamide, it is recommended to wear appropriate PPE, including gloves, safety glasses, and protective clothing. This helps to protect the skin and eyes from direct contact with the chemical.

       

      2. Handling and Storage: Polyacrylamide should be stored in a cool, dry, and well-ventilated area away from incompatible substances. Avoid exposure to heat, open flames, and direct sunlight. Follow proper handling procedures to prevent spills, leaks, and accidents.

       

      3. Inhalation and Dust Control: Polyacrylamide can sometimes generate dust particles, especially when in powdered form. Inhalation of these particles may cause respiratory irritation. It is important to work in well-ventilated areas or use local exhaust ventilation systems to control dust.

       

      4. Skin and Eye Contact: Direct contact with polyacrylamide can cause mild to moderate irritation to the skin and eyes. In case of contact, immediately rinse with plenty of water for at least 15 minutes. If irritation persists, seek medical attention.

       

      5. Environmental Considerations: Polyacrylamide can be harmful to aquatic organisms if released into water bodies. Take precautions to prevent spills or leaks into the environment. Follow local regulations for proper disposal of polyacrylamide waste.

       

      6. Health Effects: While acute exposure to polyacrylamide is generally low risk, prolonged or repeated exposure may have adverse health effects. Some studies suggest that polyacrylamide may be a potential skin sensitizer or respiratory sensitizer. It is important to follow good hygiene practices and minimize unnecessary exposure.

       

      7. Emergency Procedures: In the event of a spill or accidental release of polyacrylamide, contain the area, prevent further spread, and clean up the spill using appropriate methods and equipment. If a large spill occurs or if there is a risk of exposure to a significant amount of the substance, contact the appropriate emergency response authorities.

       

      It is important to note that the safety considerations may vary depending on the specific form and concentration of polyacrylamide being used. Always refer to the safety data sheet (SDS) and follow the manufacturer's instructions and safety guidelines for the particular product you are.

      How to choose the right type of polyacrylamide?

      Choosing the right type of polyacrylamide is crucial for various applications such as wastewater treatment, enhanced oil recovery, papermaking, and mining. With a wide range of polyacrylamide types available, selecting the most appropriate one requires careful consideration of several factors. Here are some key points to help you make the right choice:

       

      1. Polymer Structure: Polyacrylamides come in different structures, including linear, branched, or cross-linked. Linear polymers offer higher viscosity and are effective in flocculation and sedimentation processes. Cross-linked polymers have superior resistance to shear degradation and are commonly used in applications requiring increased stability.

       

      2. Charge Type: Polyacrylamides can be classified as nonionic Polyacrylamides , anionic Polyacrylamides, or cationic Polyacrylamides depending on their charge characteristics. Nonionic polymers are typically used for flocculation processes where the suspended solids have no charge. Anionic polymers are effective in neutralizing positively charged particles, while cationic polymers are suitable for negatively charged particles.

       

      3. Molecular Weight: The molecular weight of polyacrylamide affects its performance in terms of viscosity, flocculation efficiency, and shear resistance. Higher molecular weight polymers are generally preferred for applications involving solid-liquid separation, while lower molecular weight polymers are suitable for thinning and dispersing applications.

       

      4. Application Requirements: Consider the specific requirements of your application. Factors such as pH, temperature, salinity, and the presence of other chemicals can influence the effectiveness of polyacrylamides. It is essential to choose a polymer that can withstand the conditions and provide optimal performance.

       

      5. Compatibility: Ensure that the chosen polyacrylamide is compatible with other chemicals or coagulants that may be used in your process. Compatibility issues can lead to decreased efficiency or even flocculation failure.

       

      6. Environmental Considerations: Evaluate the environmental impact of the polyacrylamide you choose. Look for products that are non-toxic, biodegradable, and produced using environmentally friendly methods.

       

      7. Technical Support: If you are unsure about the appropriate type of polyacrylamide for your application, consult with experts or suppliers who can provide technical guidance and support. They can help you select the right product based on your specific needs.

       

      By considering these factors and seeking expert advice, you can choose the right type of polyacrylamide that will optimize the performance of your application while ensuring cost-effectiveness and environmental.

      What transparent of TPU influence for the color appearance of TPU products ?

      If non-transparent TPU (Thermoplastic Polyurethane) is changed to a transparent form without altering the incorporation of colorants, it can lead to a few potential problems:

       

       

      Inconsistent or altered color appearance:The colorants used in non-transparent TPU are typically designed for its opaque nature. When the TPU becomes transparent, the interaction between light and the colorants changes, which can result in an inconsistent or altered color appearance. The color may appear less vibrant or distorted, and the intended hue may not be achieved.

       

      Non-transparent TPU

       

       

      Loss of opacity: Non-transparent TPU is engineered to block or reduce the transmission of light, resulting in its opacity. When it becomes transparent, light can pass through more easily, leading to a loss of the desired opacity. This can be problematic if the material's intended purpose requires a certain level of light blocking or privacy.

      Non-transparent TPU

       

      To overcome these problems, manufacturers would need to modify the colorant formulation for transparent TPU. They would typically use transparent colorants specifically designed for transparent materials to achieve the desired color appearance. Additionally, adjustments may be needed in the material's composition and processing parameters to address changes in properties such as opacity and compatibility with surrounding.

       

      Selection of concentrated sulfuric acid pump

      Selection of concentrated sulfuric acid pump

      sulfuric acid pump

      The selection of concentrated sulfuric acid pump is a common problem in chemical industry practitioners, and concentrated sulfuric acid pump is used in many production processes, which inevitably involves the problem of type selection, such as improper selection, light ones can cause higher costs, more maintenance work, affect production, and heavy ones may lead to personal and property safety, so how to select the type correctly has become one of the important issues.

      Case medium: 98% concentrated sulfuric acid.

      Medium specific gravity: 1.84.

      Medium temperature: room temperature.

      Content of solid particles in the medium: 1% fine particles.

      Transport flow design: 12 m3/H

      Conveying head design: summary of 20 M selection:

      1.Material: there are many materials that can withstand concentrated sulfuric acid, but the material I suggest is still fluoroplastic (polytetrafluoroethylene / F46), because this material not only has excellent corrosion resistance, but also its sealing and mechanical strength are also prominent. in order to ensure the safety and durability in the process of conveying concentrated sulfuric acid, fluoroplastic is determined as the material of concentrated sulfuric acid pump.

      2.Pump type: conveying high specific gravity concentrated sulfuric acid with a specific gravity of 1.84, it is obvious that the magnetic drive pump is not the best choice, because the magnetic torque in the magnetic pump does not meet the requirements, it is likely to lead to adverse phenomena such as "demagnetization" or "heating" (unless the magnetic coupling is selected as a "rare earth magnetic cylinder" with high magnetic performance, but this increases the cost of the pump). Therefore, I suggest using centrifugal pump.

      3.The problem of motor power: because the specific gravity of concentrated sulfuric acid is 1.84, we can calculate the actual shaft power of the pump according to a simple formula, and the actual shaft power = (water test) shaft power × specific gravity.

      Therefore, it can be calculated that the motor power required for the pump is at least "1.9x1.84mm 3.496", so the motor power should be selected as: 4KW.

      4.Machine seal selection: the original machine seal can be ignored, but it is mentioned in the case that there are 1% fine particles in the medium, so the machine seal had better choose the wear-resistant machine seal-cemented carbide machine seal, particle-resistant machine seal.