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By the end of 2023, China's annual EVOH consumption will be about 30,000 tons, but more than 90% of it is dependent on imports, mainly from international giants such as Japan Kuraray (Kuraray) and Japan Synthesis Chemical (JSR).     Chuanwei Chemical (a subsidiary of SINOPEC) is currently the closest to the industrialized production of EVOH enterprises, has built an annual output of 12,000 tons of EVOH (including EVOH EW-3201 and EVOH EW-3801) production equipment, and plans to add 24,000 tons of new production capacity in the future, with a total production capacity of 36,000 tons/year, which is expected to be the first enterprise to achieve large-scale production in China. Dalian Institute of Chemical Physics, Chinese Academy of Sciences, has developed an EVOH preparation method based on alkaline deep eutectic solvent, which reduces the separation cost, improves the product purity and provides technical support for the localization of EVOH.   Shenzhen Institute of Advanced Polymer Research has successfully developed EVOH resins with performance comparable to that of international first-class products through continuous polymerization technology and polymer chain segment micro-regulation technology, filling the gaps in domestic technology.   Policy support: the national “14th Five-Year Plan” clearly puts forward to strengthen the independent research and development of high-end polymer materials, EVOH as a high-performance barrier material, by the policy encouragement and industrial funding support.   Market prospect: It is expected that after 2025, with the commissioning of domestic enterprises such as Chuanwei Chemical, the annual production capacity of EVOH in China is expected to exceed 50,000 tons, which will significantly reduce the dependence on imports, and some of the products may even be exported to the international market.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com    

EVOH (Ethylene Vinyl Alcohol Copolymer) is considered to be a more environmentally friendly material, mainly in terms of its advantages in reducing food waste, prolonging product freshness, and in the recycling process.EVOH's gas barrier properties are excellent, and it can effectively prevent oxygen, water vapor, and other substances from entering into the package, thus prolonging the shelf-life of the food, and reducing food spoilage and waste. This feature makes EVOH particularly important in food packaging, and can significantly reduce the environmental burden caused by food expiration or spoilage.     In addition, EVOH has good recyclability, and although its recyclability is not as good as that of materials such as PE (polyethylene) and PP (polypropylene), it can be used in combination with these materials to take advantage of the strengths of both materials; PE and PP have better mechanical strength and chemical resistance, while EVOH provides a better barrier to gases. Through composite use, this multi-layer packaging material ensures packaging functionality while allowing for easier disposal during recycling, helping to reduce resource waste.   What's more, EVOH is produced in a relatively environmentally friendly manner and does not release harmful substances during its use. Compared to other traditional plastic materials, the use of EVOH reduces the need for chemical additives, further minimizing the impact on the environment. Therefore, EVOH is playing an increasingly important role in promoting green packaging and circular economy, becoming an environmentally friendly and sustainable packaging material.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com    

I. Definition of Carboxylated Polyvinyl Alcohol (CPVA)Carboxylated polyvinyl alcohol is a hydrogen-modified polymer obtained through a carboxylation reaction based on polyvinyl alcohol (PVA). CPVA  has typically higher solubility and better performance than unmodified PVA.     II. Functions of Carboxylated Polyvinyl Alcohol PlasticizerCPVA can be used as a plasticizer to improve the processing properties and flexibility of plastics. It is often used in the production of soft plastics, coatings, and rubber products. AdhesiveCPVA can act as an adhesive, forming strong bonds between different materials. For example, when used as glue, it can bond materials such as paper, wood, and plastic together. LubricantCPVA can function as a lubricant, reducing friction on contact surfaces and extending the lifespan of materials. It is commonly used in industrial applications such as metalworking, textile manufacturing, and plastic processing. III. Applications of Carboxylated Polyvinyl Alcohol Packaging MaterialsCPVA is used in manufacturing food packaging materials, such as wrapping paper, plastic films, and straws. This polymer is not only safe and environmentally friendly but also provides excellent flexibility and water resistance, offering effective protection for food packaging. Paper CoatingCPVA is used to coat paper, enhancing its strength and water resistance. It is commonly applied in the production of books, magazines, and other paper-based products. Medical FieldCPVA is used to manufacture medical products, such as sutures and artificial cartilage. It has good biocompatibility and poses no adverse effects when in contact with human tissues, ensuring the safety and reliability of medical materials.   ConclusionCarboxylated polyvinyl alcohol is a multifunctional material with applications as a plasticizer, adhesive, and lubricant. It is widely used in packaging materials, paper coatings, and the medical field.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com  

EVOH (ethylene vinyl acetate copolymer) is a polymer with excellent gas barrier properties and is commonly used in food packaging, medical products, and protective materials for automotive and electronic products. Due to the high molar fraction of vinyl acetate, EVOH exhibits excellent gas barrier properties, especially for oxygen and nitrogen, and is therefore often used in food packaging to extend the shelf life of products.     The gas barrier properties of EVOH stem from its highly crystalline structure, which allows the molecular chains to be arranged more tightly, reducing the path of gas molecules through the material. In order to improve the properties of EVOH, different degrees of hydrolysis are often used to adjust the degree of crystallinity. The higher the degree of hydrolysis, the higher the crystallinity of EVOH and the consequent increase in barrier properties. Therefore, the degree of hydrolysis of EVOH must be strictly controlled during the production process to ensure that the material has ideal gas barrier properties. In China, EVOH products (EW-3201 and EW-3801) produced by Sinopec are highly recognized.     EVOH also offers significant advantages over other plastics in terms of chemical resistance, high temperature resistance and transparency. Its excellent processability allows it to be used directly in multilayer composites without the need for complex post-treatment operations during production, thus enhancing the functionality and economy of the final product.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com      

🔬 At a molar fraction of 5% vinyl acetate, the mechanical properties of EVA (ethylene vinyl acetate copolymers) become very similar to those of soft PVC.EVA is flexible in its own right, which gives it a number of advantages, such as the disadvantage of avoiding the migration of plasticizers, which is the main reason for the gradual replacement of PVC.     💪 These copolymers have a higher modulus and better processing properties than typical elastomers and do not require vulcanization considerations. Polyvinyl alcohol can be obtained by hydrolysis of polyvinyl acetate. Poly(vinyl alcohol) is an atactic cubic polymer but does not disrupt the lattice structure due to the small hydroxyl groups. Therefore, ester bases that are not sufficiently hydrolyzed reduce crystallinity and the number of intermolecular hydrogen bonds.   💧 Highly hydrolyzed poly(vinyl acetate) (containing fewer unhydrolyzed ester groups) has a higher crystallinity. As the degree of hydrolysis increases, the molecules become easily crystallized. If these molecules are not sufficiently dispersed before dissolution, hydrogen bonding will cause them to associate with each other. In order to achieve hydrolysis levels above 98%, manufacturers need to operate at a low temperature of 96°C to ensure that the larger molecules have sufficient thermal energy to dissolve.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com  

PVB resin, a versatile and highly adaptable material, has found its way into a myriad of applications across various industries. Its unique properties, such as transparency, durability, and adhesion, make it an indispensable component in modern manufacturing and technology.   PVB resin is widely used as an interlayer material in the production of safety glass. This type of glass boasts exceptional transparency and high impact resistance, making it ideal for applications in the aerospace and automotive sectors. Whether it’s for airplane windows or car windshields, PVB resin-based safety glass ensures both clarity and durability, providing an extra layer of protection in high-stakes environments.   In the realm of protective coatings, PVB resin plays a crucial role in manufacturing anti-corrosion and anti-rust paints. These coatings are known for their strong adhesion, excellent water resistance, and ability to withstand harsh weather conditions. Additionally, PVB resin is used to create metal primers and cold-resistant paints, ensuring that structures and machinery remain intact and functional even in extreme environments.   PVB resin is a key ingredient in the production of vibrant decorative films, which can serve as an alternative to traditional ceramic decals. These films are not only visually appealing but also highly durable. In the PVB resin industry, it is also used to create molding compounds that can replace metals like steel and lead. Furthermore, PVB resin-based adhesives are widely employed for bonding materials such as wood, ceramics, metals, plastics, leather, and laminated composites, showcasing its versatility.   The textile industry benefits from PVB resin in the form of fabric treatment agents and yarn tubes, which enhance the quality and durability of textiles. In the food industry, PVB resin is used to produce non-toxic packaging materials, ensuring the safety and integrity of food products. Its non-toxic nature makes it an ideal choice for packaging sensitive items like tea and cigarettes, where odor retention is a concern.   In the paper industry, PVB resin is utilized as a paper treatment agent, improving the strength and quality of paper products. Additionally, it is used to create anti-shrinkage agents, stiffening agents, and other waterproof materials, further expanding its utility in industrial applications.   PVB resin’s solubility in alcohols and non-toxic nature make it a preferred choice in the printing industry. It is compatible with various printing techniques, including flexography, gravure, letterpress, screen printing, and heat transfer printing. Its ability to produce odor-free prints makes it suitable for packaging sensitive items like tea and cigarettes. Moreover, its cationic properties allow it to adhere strongly to glass surfaces, making it particularly effective for glass decoration through screen printing.   From enhancing the safety of vehicles and aircraft to revolutionizing the printing and packaging industries, PVB resin has proven to be a material of immense value. Its adaptability, combined with its eco-friendly and non-toxic characteristics, ensures that it will continue to play a pivotal role in shaping the future of technology and industry. As research and innovation progress, we can only expect to see even more groundbreaking applications of this remarkable material.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com

In recent years, with the accelerated pace of urbanization in my country and the continuous growth of automobile sales, there has been a strong demand for PVB laminated glass. At the same time, with the development of technology, PVB Film has been researched and developed, and the application market has been further developed. In this development process, we must not only pay attention to new technological innovation, but also overcome the technical difficulties in the process of PVB waste collection and recycling, so as to achieve the environmental friendliness and maximize the economic benefits of the PVB industry. At present, the recycling of PVB resin mainly includes physical recycling method, chemical recycling method and energy recovery method.   Physical recycling is to put the discarded PVB through a series of physical treatment processes, such as separation, purification, cleaning, etc., and at the same time, add certain additives as required for reuse. This method can effectively utilize PVB materials and greatly reduce environmental pollution. For example, the PVB solid waste and scraps discarded in the market are recycled, and after sorting, cleaning, drying, and crushing processes, plasticizers, tougheners, three-salt stabilizers and other additives are added, and waterproof membranes for construction are produced through high-speed mixing, mastication, tableting and other processes. Through experimental research, it has been found that the waterproof membrane has good mechanical properties, convenient processing, and a wide operating temperature range, and has broad market prospects in the construction field.   The chemical recycling method uses light, heat, radiation, and chemical reagents to degrade PVB polymer into low-molecular single or hydrocarbon substances. At the same time, the cracked raw materials can be reused. Common cracking methods include hydrolysis, alcoholysis, thermal cracking, hydrocracking, catalytic cracking, etc. However, the current technology of this deep chemical recovery method is not very mature, the technology cost is high, and the economic benefits are low. Currently, the most commonly used method is to process waste PVB to obtain pure polymer resins and additives. Supercritical separation technology is used to separate the additives and resin in colorless PVB.   Energy recovery is the process of extracting energy from waste plastic, typically used as fuel or to generate steam to generate electricity. Because PVB polymer contains a large amount of hydrocarbons, it is flammable. Although the energy recovery method is one of the methods for recycling PVB waste, it is not commonly used due to its high cost.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com

Polyvinyl Alcohol (PVA) is a versatile polymer with diverse applications in various industries. Its unique properties, such as high tensile strength, good film-forming abilities, and excellent water solubility, make it highly sought after in the market.   The market for Polyvinyl Alcohol has grown significantly in recent years, thanks to its wide range of applications. The demand for PVA is driven by its use in sectors such as adhesives, textiles, paper, packaging, construction, and pharmaceuticals. The global market for Polyvinyl Alcohol is expected to witness steady growth due to the increasing adoption of eco-friendly and sustainable materials in various industries.   Polyvinyl Alcohol is widely used as a binder in adhesive formulations due to its excellent adhesion properties. Its application in industries such as woodworking, packaging, and labels presents significant growth opportunities. The more commonly used grades are 2488, 0588, 2688, and etc.   When it comes to the textile industry for various purposes, including sizing agents, warp yarn lubricants, and fiber modification. The increasing demand for eco-friendly textile materials and the growing emphasis on sustainable production methods provide ample opportunities for PVA in this sector. Especially in some developing countries where the textile industry is prevalent. The annual demand for PVA 1788 is extremely huge.   With its strong binding capabilities, PVA is extensively used in the paper industry. It enhances the strength and quality of paper products, leading to improved printability and durability. The rising demand for high-performance paper products and the emphasis on recyclability drive the market for PVA in this sector.   The development of flexible packaging materials has gained traction in recent years. PVA-based films and coatings offer excellent barrier properties, making them suitable for food packaging and other sensitive products. The growing demand for sustainable and recyclable packaging solutions presents opportunities for PVA-based materials. PVA water-soluble film is also widely used in demoulding and construction industries.   The future of Polyvinyl Alcohol looks promising. As industries continue to prioritize sustainability and environmental concerns, PVA's biodegradability and non-toxic nature make it an attractive choice. Additionally, ongoing research and development efforts aim to enhance the properties and expand the application scope of PVA, opening doors for novel uses in areas such as biomedicine, food, cosmetics, and 3D printing.   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.

Polyvinyl butyral (PVB) is a highly versatile and widely used polymer in various industries. It finds extensive application in the automotive, architecture, and photovoltaic industries, among others.   In the automotive sector, PVB is used as an interlayer PVB films in laminated glass, providing enhanced safety and sound insulation. In the architectural field, PVB is utilized in safety glass, offering protection against impact, UV radiation, and break-ins. Additionally, the photovoltaic industry employs PVB as a critical component in solar cell encapsulation, ensuring durability and efficient energy conversion.   The PVB market has witnessed substantial growth in recent years, driven by increasing demand for safety and energy-efficient solutions across industries. In the automotive sector, stringent safety regulations and rising consumer awareness have boosted the adoption of laminated glass, thereby driving the demand for PVB. Similarly, the growing emphasis on sustainable construction practices has fueled the demand for PVB in the architectural industry, where energy-efficient glazing solutions are sought after.   Moreover, the expanding solar energy sector has presented opportunities for PVB in photovoltaic applications. The advancements in solar cell technology and the shift towards renewable energy sources have increased the demand for PVB as a reliable encapsulation material.   The future of the PVB market looks promising, with several factors contributing to its growth. The increasing focus on safety and environmental sustainability will continue to drive demand for PVB in automotive and architectural applications. The growing urbanization and infrastructure development across regions also present significant opportunities for the PVB market.   Furthermore, advancements in PVB technology, such as the development of new formulations and improved performance characteristics, are expected to expand the scope of PVB applications. Manufacturers are investing in research and development to enhance the properties of PVB, including its optical clarity, adhesion, and resistance to yellowing over time.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com  

The full name of PVB is polyvinyl butyral, or PVB resin for short. It contains a lot of hydroxyl (OH) groups, which can produce bridging reactions with some thermosetting resins to improve chemical resistance and coating film hardness. PVB molecules contain long branched chains and have good flexibility, excellent transparency, strong adhesion, good light resistance, heat resistance, cold resistance, water resistance, film-forming properties, solubility, miscibility, high tensile strength and impact resistance, etc. It is widely used in the fields of manufacturing laminated safety glass, coatings, adhesives, ceramic film decals, vacuum aluminum foil paper, electrical materials, fiberglass products, fabric treatment agents and engineering plastics. It is a synthetic resin material with broad development and utilization prospects.   There are three main synthesis methods for producing PVB in the industry: one-step method, dissolution method and precipitation method. The following will introduce these three process methods and their advantages and disadvantages in the production process one by one.   The one-step method refers to a generation process in which the hydrolysis of polyvinyl acetate (PVAC) and the acetal reaction of the generated PVB are carried out simultaneously. It is represented by the production process of Solutia Company (the chemical division of Monsanto Company was split to form Solutia Company, which has now been acquired by Eastman Company). Vinyl acetate is bulk polymerized to form a methanol solution of polyvinyl acetate, and HCI is added for alcoholysis. The PVA generated by alcoholysis is suspended in a mixed solvent of ethanol and ethyl acetate, and butyraldehyde and HCI are added for acetal reaction. At the reflux temperature, react for 8 to 10 hours. As the reaction proceeds, PVA is completely dissolved and a uniform PVB solution is finally formed. Then add alkali to adjust the pH to 6. After reaching the specified acetal rate, it precipitates in water. After washing, neutralizing and drying, the finished PVB product can be obtained.   The dissolution method is to make PVA into a methanol suspension, add HCI and butyraldehyde to perform a condensation reaction. As the reaction proceeds, PVA gradually dissolves to form a uniform solution. After reaching the specified acetal ratio, it precipitates in water. After washing, neutralizing and drying, the finished PVB product can be obtained. The acetal rate of the PVB resin produced by this method can reach more than 86%, and the condensation distribution is uniform.   The precipitation method requires first dissolving PVA in water (85-90°C), then filtering the solution, pressing it into an acetal kettle, adding hydrochloric acid and butyraldehyde, and adding butyraldehyde in two batches to start homogeneous condensation. When the reaction reaches a certain level, PVB particles are precipitated from the solution and suspended in the mother liquor, which is a heterogeneous condensation reaction. When the condensation is completed, the material is put into a water washing kettle, washed with water, and alkali is added for stabilization, then filtered and dried to obtain powdered PVB.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com

Polyvinyl Butyral (PVB) is a versatile and widely-used thermoplastic resin known for its exceptional properties. It is made by the condensation polymerization of polyvinyl alcohol (PVA) with butyraldehyde. PVB offers unique advantages such as transparency, excellent adhesion, impact resistance, and UV stability, making it indispensable in numerous industries.   One of the key characteristics of PVB is its high transparency. PVB films have excellent optical clarity, allowing light to pass through without distortion. This property makes PVB a popular choice for safety glass applications, such as laminated glass used in automotive windshields and architectural windows. The inherent toughness of PVB also enhances the safety of laminated glass by preventing it from shattering upon impact.   PVB exhibits remarkable adhesion to various substrates, including glass, metals, and plastics. This adhesive property makes it an ideal interlayer material for laminated safety glass. The strong bond created by PVB interlayers holds the glass together even when it breaks, thus providing enhanced protection against personal injury and property damage. The adhesion of PVB also makes it suitable for laminating other materials, such as textiles, metals, and electronic components.   When used as an interlayer in laminated glass, PVB significantly improves impact resistance. The tough and flexible nature of PVB helps absorb and distribute energy upon impact, minimizing the risk of breakage. This impact-resistant property finds applications in safety glass for automotive windshields, architectural structures, and bullet-resistant glass.   PVB exhibits excellent resistance to ultraviolet (UV) radiation. It acts as a UV stabilizer, protecting the underlying materials from degradation caused by prolonged exposure to sunlight. This makes PVB an ideal choice for outdoor applications, such as solar panels and architectural glazing, where UV resistance is crucial.   PVB can be customized and modified to suit specific application requirements. By altering the molecular weight and modifying the plasticizers, various grades of PVB with different characteristics can be produced. This versatility enables manufacturers to tailor PVB properties such as viscosity, glass transition temperature, and adhesion strength to meet the specific needs of different industries, including automotive, construction, and electronics.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com  

VAE emulsion, also known as Vinyl Acetate Ethylene Copolymer Emulsion, is highly regarded in the adhesives industry for its exceptional bonding capabilities. VAE emulsion adhesive, a product of Vinyl Acetate Ethylene Copolymer Emulsion, offers tremendous advantages as a reliable and versatile adhesive across various industries. Its numerous formulations, each utilizing different protective colloids, provide tailored solutions to specific application requirements.   VAE emulsion is a versatile adhesive solution that finds widespread application due to its excellent adhesion properties. It is commonly used in industries such as construction, woodworking, packaging, and automotive, offering a reliable bond across different substrates. One notable advantage of VAE emulsion adhesive is its ability to form strong bonds on porous materials, including wood, paper, and fabric.   The formulations of VAE emulsion vary based on the protective colloids used during production, resulting in diverse properties and performance attributes. VAE emulsion is usually prepared using a medium-pressure emulsion polymerization process, with an ethylene mass fraction of 10% to 40%, generally 14% to 18%. Using different protective colloids, the structure and performance of the emulsion are different. VAE emulsion made with polyvinyl alcohol as protective colloid has excellent viscosity, fast curing speed, and strong adhesion to PVC film. A protective system that combines nonionic surfactants and carboxymethylcellulose, its VAE emulsion has excellent adhesion to PVC. It has good water-based properties and can be used with borax and dextrin. Commonly used VAE emulsion grades include CW 40-705, CW 40-707, CW 40-716, CW FH-Ⅰ. These are widely used in woodworking, packaging, plastic film lamination, printing, textile and construction industries   VAE emulsion adhesive boasts several noteworthy characteristics that contribute to its popularity. It often exhibits excellent film-forming properties, creating a durable and long-lasting bond. The adhesive's high solid content allows for efficient coverage and reduced drying time, making it suitable for both manual and automated applications. Additionally, VAE emulsion adhesive typically possesses low VOC (Volatile Organic Compound) levels, promoting healthier and more sustainable working environments.   Beyond its traditional use as an adhesive, VAE emulsion finds innovative applications through modification processes. By introducing compatible additives or compounds, VAE emulsion adhesive can achieve specific properties tailored to unique requirements. Examples include the modification of VAE emulsion adhesives for improved heat resistance in automotive applications, enhanced water resistance in packaging applications, or increased flexibility in textile applications. These modifications broaden the range of industries and applications that can benefit from VAE emulsion adhesive.   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.