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Degree of polymerization and alcoholysis of polyvinyl alcohol

2024-09-05

Polyvinyl alcohol is obtained through the alcoholysis of polyvinyl acetate. Its degree of alcoholysis refers to the percentage of the number of vinyl alcohol units in the molecular chain to the total number of molecular structural units. The degree of polymerization of polyvinyl alcohol refers to the number of repeating units in the molecular chain, which directly affects the length and physical properties of the molecule. The different degrees of polymerization determine the different application fields and properties of polyvinyl alcohol. For example, polyvinyl alcohol with an ultra-high degree of polymerization is often used in applications requiring greater strength and durability, while polyvinyl alcohol with a lower degree of polymerization may be more suitable for applications requiring better solubility or flexibility.

 

For example: According to the chemical formula of polyvinyl alcohol (-C2H2O-)n, PVA 2488, -88 means that the degree of alcoholysis is 88mol%, and 24- means that its degree of polymerization is about 2400, so the ideal molecular formula of PVA2488 should be (-C2H2O-) 2400. The adjustment is approximately 2400*44=105600. Therefore, one is to measure the size of the formed skeleton, and the other is to measure the conversion rate into the desired product. Those two are different.

 

 

Polyvinyl alcohol (PVA) is the hydrolyzate of polyvinyl acetate. The solvent of PVA is water, but its solubility in water is largely affected by the degree of polymerization and is dominated by the degree of alcoholysis. Completely alcoholylated PVA has very little dissolution in water. When the alcoholysis degree is below 88%, it is almost completely dissolved at room temperature of 20°C. However, as the alcoholysis degree increases, the solubility decreases significantly. Solubility PVA is soluble in water. The higher the water temperature, the greater the solubility, but it is almost insoluble in organic solvents.

 

PVA solubility changes with the degree of alcoholysis and polymerization. .Partial alcoholysis and low polymerization degree PVA dissolve very quickly, while complete alcoholysis and high polymerization degree PVA dissolve slowly. As a general rule, the degree of alcoholysis has a greater impact on the solubility of PVA than the degree of polymerization.

 

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ElephChem Holding Limited, professional market expert in Polyvinyl Alcohol(PVA) and Vinyl Acetate–ethylene Copolymer Emulsion(VAE) with strong recognition and excellent plant facilities of international standards.

High strength high modulus polyvinyl alcohol fiber

2024-09-05

High-strength and high-modulus polyvinyl alcohol fiber, as a high-performance fiber product with excellent mechanical properties, biocompatibility and non-toxicity, has shown strong development momentum in the Chinese market in recent years. And driven by factors such as technological innovation, growing market demand, and increasing environmental awareness, the industry will continue to maintain rapid development.

 

The raw materials of high-strength and high-modulus PVA mainly include basic chemical raw materials such as coal, acetic acid, and vinyl acetate. These raw materials undergo a series of chemical reactions and are converted into preliminary products of polyvinyl alcohol (PVA), providing basic materials for the production of high-strength and high-modulus PVA.

 

The company uses upstream raw materials and uses specific spinning processes and drawing technologies to produce PVA fibers with excellent properties such as high strength and high modulus. This process requires advanced production equipment and technical support to ensure product quality and stability.

 

High-strength and high-modulus PVA fibers are widely used in many downstream industries, including building reinforcement materials, composite materials, textile industry (such as bulletproof vests, high-strength ropes, etc.), medical fields (such as surgical sutures, drug sustained-release carriers, etc.) and Environmental protection fields (such as water treatment, soil improvement, etc.). The needs and changes in the downstream market directly drive the development of the high-strength and high-module PVA industry.

 

The application of high-strength and high-modulus PVA fiber in the field of building materials is particularly prominent. It is mainly used to replace asbestos to enhance the strength and anti-cracking properties of cement products. Simply adding 0.3% to 0.5% of high-strength and high-modulus polyvinyl alcohol fiber and a small amount of polymer to substrates such as cement and gypsum can effectively change the brittleness of the substrate and eliminate cracks.

 

In textile, papermaking, coating and other fields, high-strength and high-modulus PVA fiber also plays an important role. In the field of textiles, it can be used as an auxiliary agent such as spinning fluid and textile slurry; in the field of papermaking, it is often used for surface coating, adhesion and paper strength improvement; in the field of coatings, it can enhance the adhesion of coatings and durability.

 

Website: www.elephchem.com

Whatsapp: (+)86 13851435272

E-mail: admin@elephchem.com

ElephChem Holding Limited, professional market expert in Polyvinyl Alcohol(PVA) and Vinyl Acetate–ethylene Copolymer Emulsion(VAE) with strong recognition and excellent plant facilities of international standards.

Properties and applications of high polymerization PVA

2024-09-05

High degree of polymerization PVA has excellent strength and durability due to its high degree of polymerization, and is an important raw material for preparing high-strength materials. High degree of polymerization is generally above 5000.

 

1. High-strength adhesive: High-polymerized PVA can be used to prepare high-strength glues that can firmly bond various materials and are widely used in construction, automobiles, electronics and other fields. For example, in the construction field, PVA adhesives are used to bond ceramic tiles, stone, wood and other materials, showing good durability and water resistance.

 

2. Film materials: High-polymerization PVA can also prepare transparent film materials. These film materials have excellent tensile strength, crack resistance and air barrier properties, and are suitable for textiles, food packaging and other fields. For example, film materials made of high-polymerized PVA are widely used in the packaging of high-end textiles because they are non-static, oil-resistant, and resistant to organic chemicals.

 

3. Special functional materials: Due to its unique properties, ultra-high molecular PVA is often used to prepare materials with special functions. For example, in the field of biomedicine, ultra-high molecular PVA can be used as artificial blood vessels, biomedical materials, etc. Because of its good biocompatibility and mechanical properties, it can effectively replace or assist human tissue.

 

4. Advanced coating materials: Ultra-high molecular PVA can also be used to prepare advanced coating materials. These materials have excellent wear resistance, scratch resistance, chemical corrosion resistance and other properties, and are widely used on the surfaces of key components in automobiles, aerospace and other fields. coating.

 

Website: www.elephchem.com

Whatsapp: (+)86 13851435272

E-mail: admin@elephchem.com

ElephChem Holding Limited, professional market expert in Polyvinyl Alcohol(PVA) and Vinyl Acetate–ethylene Copolymer Emulsion(VAE) with strong recognition and excellent plant facilities of international standards.

 

Properties and applications of medium and low polymerization degree PVA

2024-09-05

Low degree of polymerization PVA has good water solubility and plasticity due to its lower degree of polymerization and shorter molecular chain. These properties make low-polymerization PVA widely used in many fields. The degree of polymerization of PVA is generally below 1000.

 

PVA granule

1. Water-soluble adhesive: Low-polymerized PVA is often used as a water-soluble adhesive because of its excellent water solubility. For example, in the paper products industry, low-polymerized PVA is used for cardboard lamination, corrugated cardboard bonding, and office glue. It also has the advantage of being safe and non-toxic, making it widely used in the packaging industry, such as the bonding of kraft paper bags for heavy objects such as cement, fertilizers, and grain.

 

2. Coatings and coating materials: Low-polymer PVA can be used as a coating material on the surface of paper, which can significantly improve the gloss and anti-permeability of the paper. In addition, it can also be used as a pigment processing agent to improve the whiteness and gloss of coated paper and enhance the printing effect.

 

3. Commonly used low-polymerization polyvinyl alcohols such as PVA 05-88. This grade of PVA is also used for medical devices, warp sizing, release agents, etc.

 

Medium degree of polymerization PVA has a moderate degree of polymerization and exhibits good strength and heat resistance, so it is suitable for occasions that require a certain degree of strength and durability. The degree of polymerization of PVA is between 1000 and 5000.

 

1. Textile enhancer: Medium-polymerized PVA is commonly used as a textile enhancer in the textile industry. By adding it to textiles, it can significantly improve the softness and wear resistance of textiles, thereby extending their service life. For example, by blending medium-polymerized PVA with cotton, wool, viscose fiber, etc., you can produce Vinyl textiles with excellent properties.

 

2. Fiber products: Medium-polymerized PVA can also be used as a raw material for fiber products, such as PVA fiber (vinylon) that has been dissolved, spun and acetalized, and is widely used in clothing, tarpaulins, cords, fishing net ropes, etc.

 

3. Commonly used polyvinyl alcohols with medium polymerization degrees include PVA 17-88, 20-8824-8826-88 etc. These can also be used to produce glues, paper adhesives, fabric finishing agents, PVA films, etc

 

 

Website: www.elephchem.com

Whatsapp: (+)86 13851435272

E-mail: admin@elephchem.com

ElephChem Holding Limited, professional market expert in Polyvinyl Alcohol(PVA) and Vinyl Acetate–ethylene Copolymer Emulsion(VAE) with strong recognition and excellent plant facilities of international standards.

How to Choose a High-Quality Antimony Trioxide Supplier from China A Practical Guide

2024-08-29

Antimony trioxide (Sb2O3) with a purity of over 99.5% is crucial for optimizing processes in the petrochemical and synthetic fiber industries. China is a major global supplier of this high-purity catalyst-grade material. For international buyers, importing antimony trioxide from China involves several considerations. Here’s a practical guide to addressing common concerns and selecting a top-notch supplier, illustrated with a real-world example.

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Common Concerns for Overseas Buyers

1.Quality Assurance: Buyers often worry about the purity and consistency of the product. High-purity antimony trioxide is essential for effective catalytic performance.

2.Supplier Reliability: Concerns about the supplier’s ability to deliver on time and maintain quality can impact production schedules.

3.Regulatory Compliance: Ensuring the product meets international standards and regulations is crucial.

4.Customer Support: Effective communication and support are necessary for resolving any issues.

Methods to Address Concerns

1.Request Certifications: Verify that the supplier holds relevant certifications such as ISO 9001 (Quality Management) and ISO 14001 (Environmental Management). These indicate adherence to international quality and environmental standards.

2.Evaluate Technical Capabilities: Check if the supplier uses advanced production technologies and has a dedicated R&D team to ensure product quality and innovation.

3.Review Sample Products: Obtain samples for independent testing to confirm that the product meets the required purity levels and specifications.

4.Check Customer Reviews and References: Look for feedback from other international clients to gauge the supplier’s reliability and customer service.

5.Assess Communication and Support: Ensure the supplier offers robust support and clear communication channels to address any concerns or issues promptly.

Case Study: Choosing a Supplier for Antimony Trioxide

Scenario: GlobalChem, an international company specializing in petrochemical production, must import high-purity antimony trioxide from China for their catalytic processes. They are looking for a reliable supplier that can consistently deliver a product with a purity of 99.9% or higher.

Selection Process:

1.Define Requirements:

1.Purity: 99.9% or higher.

2.Certifications: ISO 9001 and ISO 14001.

3.Delivery Time: 4-6 weeks.

4.Technical Support: Comprehensive assistance with product usage.

2.Research Potential Suppliers: GlobalChem identifies several suppliers using online trade platforms and industry directories.

3.Evaluate Certifications:

1.Supplier X: Holds ISO 9001 and ISO 14001 certifications. Provides detailed purity reports.

2.Supplier Y: Only has ISO 9001 and less detailed purity documentation.

4.Conclusion: Supplier X is preferred due to its additional ISO 14001 certification and thorough documentation.

5.Assess Technical Capabilities:

1.Supplier X: Uses state-of-the-art production equipment and has a strong R&D team.

2.Supplier Y: Utilizes older technology with no dedicated R&D support.

6.Conclusion: Supplier X’s advanced technology and R&D capabilities suggest superior product quality and reliability.

7.Review Customer Feedback:

1.Supplier X: Positive reviews from other international clients, with testimonials highlighting consistent quality and dependable service.

2.Supplier Y: Mixed reviews with occasional issues reported.

8.Conclusion: Supplier X’s positive reputation supports its reliability and service quality.

9.Evaluate Customer Support:

1.Supplier X: Offers excellent customer support with prompt responses and detailed technical assistance.

2.Supplier Y: Limited support with slower response times.

10.Conclusion: Supplier X’s strong customer support is crucial for smooth operations.

11.Test Samples: GlobalChem requests samples from Supplier X. The samples confirm that the antimony trioxide meets the required 99.9% purity.

12.Finalize the Agreement: After confirming the supplier’s credentials and product quality, GlobalChem signs a contract with Supplier X, ensuring terms for regular deliveries and support services.

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Conclusion

Selecting a high-quality antimony trioxide supplier from China involves careful evaluation of key factors:

Certifications and Quality Assurance: Confirm compliance with international standards.

Technical Capabilities: Ensure modern production technology and R&D support.

Customer Reviews: Check feedback for reliability and service quality.

Customer Support: Evaluate the supplier’s responsiveness and support.

By following these steps, GlobalChem successfully secured a reliable and high-quality supplier, ensuring efficient and effective production for their petrochemical processes.

Enhancing Plastic Performance A Deep Dive into STYRENE N-PHENYLMALEIMIDE MALEIC ANHYDRIDE COPOLYMER

2024-08-28

In the evolving landscape of materials science, the demand for advanced plastics that can withstand harsh environments is greater than ever. Industries ranging from automotive to electronics rely on polymers that not only meet rigorous safety and performance standards but also deliver exceptional durability under extreme conditions. One of the most effective ways to enhance the performance of these plastics is through the addition of heat-resistant modifiers: STYRENE N-PHENYLMALEIMIDE MALEIC ANHYDRIDE COPOLYMER manufactured by Yangchen Tech.

 

Among these, the STYRENE N-PHENYLMALEIMIDE MALEIC ANHYDRIDE COPOLYMER manufactured by Yangchen Tech stands out as a key player. This copolymer, known for its robust thermal stability and mechanical properties, is increasingly being utilized to improve the performance of plastics, enabling them to function reliably in high-temperature applications. In this article, we will explore how this copolymer works as a heat-resistant modifier, its benefits, and its wide-ranging applications in various industries.

 

STYRENE N-PHENYLMALEIMIDE MALEIC ANHYDRIDE COPOLYMER

 

Basic Physical Properties manufactured by Yangchen Tech

 

 

N-phenylmaleimide terpolymer (NSM 1 #)

Test Item

Test Standard

Test Data

Molecular weight and distribution

GPC

Mw=12~15*10 4 ; PDI=2.0~3.0 

Glass transition temperaturehttps://www.yangchentech.com℃

DSC

150-180℃(customized optional)

Initial decomposition temperaturehttps://www.yangchentech.com℃

TGA

395-405℃

Density

ASTM-D792

1.15-1.25ghttps://www.yangchentech.comcm3

Appearance

——

white powders

 

The Importance of STYRENE N-PHENYLMALEIMIDE MALEIC ANHYDRIDE COPOLYMER in Plastics

Plastics have revolutionized modern manufacturing, offering unparalleled versatility, lightweight characteristics, and cost-effectiveness. However, one of the inherent limitations of many plastics is their sensitivity to heat. Traditional plastics often soften, deform, or lose their structural integrity when exposed to elevated temperatures, which can be a significant drawback in applications that require high thermal resistance.

 

This is where heat-resistant modifiers come into play. By incorporating these modifiers, manufacturers can significantly enhance the thermal performance of plastics, making them suitable for use in demanding environments. Heat-resistant modifiers not only improve the material's ability to withstand high temperatures but also enhance other properties such as mechanical strength, chemical resistance, and dimensional stability.

 

Understanding STYRENE N-PHENYLMALEIMIDE MALEIC ANHYDRIDE COPOLYMER

The STYRENE N-PHENYLMALEIMIDE MALEIC ANHYDRIDE COPOLYMER is a high-performance copolymer that combines the beneficial properties of styrene, N-phenylmaleimide, and maleic anhydride. Each component of this copolymer contributes to its unique characteristics:

 

Styrene: Provides the polymer with rigidity, toughness, and ease of processing.

N-Phenylmaleimide: Enhances the thermal stability and mechanical strength of the polymer.

Maleic Anhydride: Improves the polymer's adhesion properties and compatibility with other materials, allowing for better blending and modification.

When combined, these monomers create a copolymer that exhibits excellent heat resistance, making it an ideal choice for applications that require long-term stability at elevated temperatures.

 

How STYRENE N-PHENYLMALEIMIDE MALEIC ANHYDRIDE COPOLYMER Improves Plastic Performance

The incorporation of STYRENE N-PHENYLMALEIMIDE MALEIC ANHYDRIDE COPOLYMER into plastic formulations can lead to significant improvements in several key areas:

 

1. Thermal Stability

One of the most critical benefits of this copolymer is its exceptional thermal stability. Plastics modified with this copolymer can maintain their structural integrity and performance even when exposed to high temperatures over extended periods. This makes them suitable for use in applications such as automotive engine components, electrical insulation, and industrial machinery, where consistent performance under heat stress is essential.

 

2. Mechanical Strength

In addition to its thermal properties, the copolymer also enhances the mechanical strength of plastics. The inclusion of N-phenylmaleimide in the copolymer’s structure contributes to its high tensile strength and resistance to deformation. This ensures that the modified plastics can withstand mechanical stresses and maintain their shape and functionality under load, making them ideal for structural components in various industries.

 

3. Chemical Resistance

Plastics modified with STYRENE N-PHENYLMALEIMIDE MALEIC ANHYDRIDE COPOLYMER also exhibit improved chemical resistance. This is particularly important in environments where the material is exposed to aggressive chemicals, solvents, or corrosive substances. The copolymer’s resistance to chemical degradation helps extend the lifespan of the plastic products and reduces the risk of failure in critical applications.

 

4. Dimensional Stability

Dimensional stability is another crucial factor in high-performance plastics. The copolymer’s ability to resist shrinkage and maintain its dimensions under thermal and mechanical stress ensures that the plastic components retain their precision and functionality throughout their service life. This is especially important in applications where tight tolerances are required, such as in precision-engineered parts.

How to Use Sodium Alginate for Reflux

2024-08-27

Reflux, also known as GERD (gastroesophageal reflux disease), causes heartburn and discomfort. While medications are common for relief, sodium alginate, a natural compound from seaweed, offers an alternative approach. Here’s how to use sodium alginate for reflux relief.

 

Choose the Right Form:

Sodium alginate is available in liquid, chewable tablets, and powder forms. Pick the one that suits your preference and is easy to use.

 

Follow the Recommended Dosage:

Always read the instructions on the packaging or ask a healthcare professional about the correct dosage. Typically, sodium alginate is taken after meals or before bed, allowing it to form a barrier when you’re lying down.

 

Prepare the Dosage:

 

Liquid: Measure the correct amount using a measuring cup or spoon.

Chewable Tablets: Simply follow the instructions and chew them thoroughly.

Powder: Mix with water or juice as directed.

Take the Medication:

Consume the sodium alginate according to the recommended dosage. Whether it's swallowing the liquid, chewing the tablets, or drinking the prepared mixture, follow the instructions closely.

 

Observe Precautions:

Sodium alginate may interact with certain medications or health conditions. If you have any concerns, consult your healthcare provider before starting.

 

Monitor Your Symptoms:

Keep track of your reflux symptoms and any changes after using sodium alginate. This helps determine if the treatment is working and if any adjustments are needed.

 

Conclusion:

 

Sodium alginate, a natural product from seaweed, can help manage reflux symptoms by forming a protective barrier in the stomach.

 

 

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What Food is Natamycin In?

2024-08-27

Natamycin is a key ingredient in food preservation, especially for preventing spoilage and mold. Let's break down what natamycin is and the types of food it is commonly found in.

 

What is Natamycin?

Natamycin is a natural antifungal compound made by certain bacteria through fermentation. It's been used for decades to stop mold and yeast growth in foods. Unlike synthetic preservatives, natamycin is natural, making it a preferred choice for clean-label foods. It is safe and approved by food safety authorities worldwide, including the FDA, EFSA, and WHO.

 

Foods That Commonly Contain Natamycin

Natamycin is used in many foods that are prone to mold. Here are some common examples:

 

Cheese

Hard and Semi-Hard Cheeses: Natamycin is often applied to the surface of cheeses like Gouda, Cheddar, and Parmesan. It prevents mold during aging and extends shelf life without changing the cheese's flavor, aroma, or texture.

Soft Cheeses: It's also sometimes used in soft cheeses like Brie or Camembert to prevent unwanted mold while still allowing the necessary mold for ripening.

Yogurt and Fermented Dairy Products

 

In products like yogurt, sour cream, and kefir, natamycin helps prevent mold, extending shelf life and maintaining quality.

Baked Goods

 

Breads, pastries, and other baked goods can develop mold, especially in humid conditions. Natamycin is used on these products to prevent mold without affecting taste or texture.

Meat Products

 

Cured and processed meats like sausages and salamis are treated with natamycin to stop mold growth during storage and distribution, ensuring safety and quality.

 

 

For related products, please visit our website:https://www.reachever.com/

 

 

How Long Does Melatonin Last?

2024-08-27

Melatonin is a hormone that our body makes naturally to help us sleep. Sometimes, people have trouble sleeping and take melatonin supplements to help. As a company that supplies melatonin, we know it's important to share clear information. This article will explain how long melatonin works in your body.

 

 

Melatonin comes in different forms, like tablets, capsules, and liquids. When you take it, melatonin goes into your bloodstream and helps your brain get ready for sleep. How long it lasts depends on a few things:

 

 

Dosage: The amount of melatonin you take affects how long it works. Smaller doses (like 0.5 to 1 milligram) usually last a few hours. Bigger doses (like 3 to 10 milligrams) might work for 4 to 8 hours.

 

 

Individual Differences: Everyone’s body is different. Your age, weight, and health can change how long melatonin stays in your system.

 

 

When You Take It: The timing also matters. If you take melatonin about 30 minutes to an hour before bed, it can help you fall asleep and stay asleep through the night.

 

 

Type of Melatonin: Some melatonin supplements are made to release the hormone slowly over time. These can last longer than the regular ones that release it all at once.

 

 

To sum up, how long melatonin lasts depends on the dose, your body, when you take it, and the type you use. Lower doses might not last as long, but higher doses and special formulations can work longer. As a melatonin supplier, we focus on giving you high-quality products to help you sleep better.

 

 

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How Long Does It Take for L-Glutathione to Lighten Skin?

2024-08-27

L-glutathione, a supplement thats gaining popularity, is known for its potential to lighten skin. But how long does it actually take to see results?

 

L-glutathione is a powerful antioxidant that our bodies naturally produce. It helps protect our cells, supports detoxification, and boosts our immune system. Recently, people have started using it for its skin-lightening effects.

 

However, the time it takes for L-glutathione to lighten skin can be different for everyone. Your bodys unique chemistry and genetics play a big role in how quickly you might see changes. Some people notice improvements in their skin tone within a few weeks, but for others, it might take longer.

 

Its important to be patient and consistent. You might need to take L-glutathione supplements for several months before seeing the full effects. Combining the supplement with a good skincare routine and following recommended guidelines will help you achieve the best results.

 

Keep in mind that patience and consistency are key. With time, you might start to see the radiant, even-toned skin youre aiming for.

 

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