Polyvinyl Alcohol

The global consumption structure of polyvinyl alcohol (PVA) is: polymerization assistants account for about 24%, polyvinyl butyral (PVB) accounts for about 15%, adhesives account for about 14%, textile pulp accounts for about 14%, and paper pulp Materials and coatings account for about 10%, and others 23%.   The consumption structure of polyvinyl alcohol (PVA) in China is: polymerization assistants account for about 38%, fabric slurries account for about 20%, adhesives account for about 12%, vinylon fibers account for about 11%, papermaking slurries and coatings account for about 8% %, architectural coatings account for about 5%, and others 6%. Polymerization aids, fabric sizing and adhesives are the main downstream consumer markets for polyvinyl alcohol.   In the first half of 2023, the supply and demand of China PVA products were in a weak balance, and prices were running at low levels. The advantages of China PVA variety in supporting a stable market share. With the introduction of new technologies, new processes, and new products, the continuous expansion of new application fields, and the gradual replacement of imported products, new development opportunities have been brought to the domestic polyvinyl alcohol and vinylon industry. However, as various companies increase their export efforts and adopt fierce competition at the low end, and with the adjustment of China's industrial structure, rising wages and other costs, and high environmental protection requirements, some downstream industries, such as the labor-intensive textile industry, have relocated to Southeast Asia, making domestic Demand growth momentum has slowed, foreign consumption has increased, and exports have increased. After more than ten years of competitive integration and optimization, the industry is showing a new pattern of optimized production capacity, increased concentration, stable market varieties, slow growth in market demand, high technical barriers, moderate competition, and innovation-driven development, reaching a new balance between supply and demand. Develop into a benign new business format.   With the rapid development of PVA downstream industries such as PVA optical film, PVB film, polymerization additives, soil improvement, paper adhesives, ceramic adhesives, environmental protection, medicine and cosmetics, the demand for special PVA products is very strong, and Anhui The special PVA products of leading enterprises in the industry represented by ElephChem have developed rapidly, and they have increased their research and development efforts on PVA fiber, PVB resin, PVB film, PVA optical film, redispersible rubber powder and other products. Special varieties of PVA and The production technology of downstream new material products is becoming increasingly mature, filling many gaps in the country. New PVA products are gradually being put on the market, and their market share is also constantly increasing. Common varieties have basically achieved import substitution, and the downstream consumption structure of the domestic PVA industry has been further expanded.

China is one of the world's largest PVA production countries, since 1965 Beijing Oriental Petrochemical Co., LTD. (the former Beijing Organic Chemical plant) from Japan to introduce technology to build China's first set of calcium carbide acetylene method (from calcium carbide acetylene method to petroleum ethylene method in 1995) PVA production plant, China's PVA production has developed steadily.   According to statistics, in 2015, China's polyvinyl alcohol (PVA) production was about 700,000 tons, increasing to 802,000 tons in 2022, with a compound annual growth rate of 1.96% during the period. In terms of demand, the apparent consumption of PVA in China in 2022 was 639,600 tons, an increase of 2.16%. Common types such as PVA 2488, PVA 2088 and PVA 0588 are in great demand in various fields.   Output and consumption

  Polyvinyl alcohol (PVA) has several applications in agriculture, including:   1. Seed coating: PVA can be used as a seed coating material to enhance germination, improve seedling growth, and provide protection against pests and diseases.   2. Soil stabilizer: PVA can be added to soil to improve its structure and stability, especially in erosion-prone areas. It helps reduce soil erosion, increase water retention, and enhance soil fertility.   3. Mulching film: PVA films can be used as mulching materials to cover the soil around plants. This helps to conserve moisture, control weed growth, and maintain stable soil temperatures, leading to improved plant growth and higher crop yields.   4. Slow-release fertilizers: PVA can be incorporated into fertilizer formulations to create slow-release or controlled-release fertilizers. This allows nutrients to be released gradually over time, providing sustained nutrition to plants and minimizing nutrient leaching.   5. Crop protection: PVA can be used as a component in biodegradable agricultural films for crop protection purposes. These films can be used for insect barriers, weed control, and microbial resistance, reducing the reliance on conventional plastic films.   6. Hydrogel applications: PVA hydrogels have been utilized in agriculture for various purposes, such as water retention in drought-prone areas, as carriers for controlled release of agrochemicals, and as bio-based materials for seed germination and plant growth.   These applications demonstrate the versatility of PVA in agriculture, providing solutions for improving plant growth, conserving resources, and promoting sustainable farming practices.   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 alcohol (PVA) has various applications in the film industry. Here are some of the common applications of PVA in films:   1. Water-soluble film: PVA can be used to produce water-soluble films that are used for packaging various products such as detergents, agrochemicals, and personal care products. These films dissolve in water, providing convenience and reducing waste.   2. Food packaging film: PVA can be used as a coating or component in food packaging films. It provides excellent oxygen barrier properties, moisture resistance, and aroma retention, helping to extend the shelf life of food products.   3. Biodegradable film: PVA can be used to produce biodegradable films that are environmentally friendly. These films can replace traditional plastic films in applications such as mulch films, agricultural films, and compostable packaging materials.   4. Drug delivery films: PVA films can be used as drug delivery systems in the pharmaceutical industry. These films can be loaded with active pharmaceutical ingredients and used for transdermal patches, oral dissolvable films, or other drug delivery applications.   5. Optical film: PVA can be used in the production of optical films for applications such as LCD displays and optical lenses. These films provide excellent optical clarity, high transparency, and low birefringence.   6. Photographic film: PVA has been widely used in the production of photographic films. It acts as a binder and protective coating, ensuring adhesion of the photo emulsion to the film base and providing surface protection.   Overall, PVA has versatile properties that make it suitable for a wide range of film applications, including water-soluble films, food packaging films, biodegradable films, drug delivery films, optical films, and photographic films.   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.   PVA 088-50 & PVA 24-88 Polyvinyl alcohol PVA 088-20 & PVA 17-88 Polyvinyl alcohol PVA 100-27 & PVA 1799 Polyvinyl alcohol    

Polyvinyl alcohol (PVA) is used in textile sizing, which is the process of applying a protective coating to yarn or fabric to enhance its weaving and handling properties. In textile sizing, various grades of PVA can be utilized, depending on the specific requirements of the sizing process and the desired characteristics of the finished textile product.   The selection of the PVA grade depends on factors such as the desired viscosity, film-forming properties, adhesion strength, and water solubility. Generally, medium-to-high molecular weight PVA grades with moderate viscosity are preferred for textile sizing applications. These grades offer good film-forming ability, excellent adhesion to the fibers, and compatibility with other sizing agents.   PVA-based sizing formulations may also include additional additives like lubricants, softeners, antistatic agents, and crosslinking agents to further enhance the performance and processability of the sized yarn or fabric.   It's worth noting that the specific PVA grade and formulation used for textile sizing can vary depending on the type of textile fibers being sized (e.g., natural or synthetic fibers), weaving techniques, and the desired properties of the final textile product.   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.

Pharmaceutical grade polyvinyl alcohol (PVA) is a high-purity form of PVA that meets specific quality standards and regulations for use in the pharmaceutical industry. It is used in various pharmaceutical applications, including as a binder, film former, coating agent, and viscosity modifier.   Pharmaceutical grade PVA undergoes stringent quality control processes to ensure its purity, stability, and safety. It is typically produced using high-quality raw materials and advanced manufacturing techniques to meet the strict requirements of the pharmaceutical industry.   The properties of pharmaceutical grade PVA, such as its solubility, viscosity, and film-forming characteristics, can be tailored to suit specific pharmaceutical formulations. It is often used in the production of tablets, capsules, oral suspensions, ophthalmic solutions, and topical formulations.   Due to its biocompatibility, low toxicity, and good film-forming properties, pharmaceutical grade PVA is widely accepted and used in the pharmaceutical industry. It plays a crucial role in improving the stability, bioavailability, and overall performance of pharmaceutical products.   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.  

Using succinic acid as the cross-linking agent, through the reaction of COOH- and OH-, an ester group is generated, which cross-links the PVA molecules and generates a modified PVA glue that is insoluble in water. The introduced COOH-group can improve its water resistance, hardness, adhesion, etc.   Weigh an appropriate amount of PVA, add water, heat it in a water bath with electric stirring, and control the water bath temperature to 80-90°C. After it is completely dissolved, stop heating to obtain PVA glue. In a water bath at a certain temperature, add an appropriate amount of succinic acid to the above-mentioned PVA glue, stir it under closed conditions to react, and cool to room temperature to obtain a modified PVA glue.   Using succinic acid as the cross-linking agent, PVA glue was modified, and the optimal modification conditions were determined to be: PVA glue mass concentration 7%, reaction temperature 85°C, and PVA glue to succinic acid mass ratio 5.6:1. Here Under the conditions, the hardness, adhesion, viscosity and impact resistance of the modified PVA glue obtained were significantly improved, and the water resistance was also improved. This method can be used to prepare PVA adhesives and coatings that require high adhesion and water resistance. 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 acetal mixed aldehyde adhesive can be prepared by using polyvinyl alcohol (PVA) and crotonaldehyde as the main raw materials, hydrochloric acid (HCl) as the catalyst and acetaldehyde as the modifier.   Put a certain amount of PVA into a three-necked flask equipped with a mechanical stirrer and a reflux condensation device, add deionized water, adjust the water bath temperature to 95°C, and keep it warm for 2 hours to fully dissolve it; when the solution cools to room temperature, Slowly add measured HCl dropwise while stirring, and mix thoroughly; heat the water bath to the specified temperature, add crotonaldehyde and acetaldehyde solutions according to the formula, and stir thoroughly; after the reaction is completed, use NaOH solution to adjust the pH value to 8 to 9, and then add Add appropriate amount of urea and stir for 20 minutes.   The results show that when the reaction temperature is (90±2)℃, the reaction time is 4 h, 8% PVA solution is 200 mL, HCl is 1mL, crotonaldehyde is 1.0~1.5mL, and acetaldehyde is 4mL, acetalization The viscosity of the product is moderate, the bonding strength is relatively maximum (4.5MPa), and the water resistance is relatively good; under the premise that other conditions remain unchanged, by changing the amount of crotonaldehyde, the final viscosity of the system can be further adjusted to meet the requirements of wood. Adhesive usage requirements.   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.   PVA 2488 & 088-50 Modified PVA 725 PVA 1788 & 088-20    

By adding nanoscale reinforcements to the composite matrix, the mechanical properties of the composite (such as strength, stiffness, elastic modulus, etc.) can be significantly improved. The polyvinyl alcohol adhesive modified with nano-silica particles is non-toxic and pollution-free. It will be widely used and is worthy of systematic research.   Current research on the modification of nanoparticles mainly focuses on the following two aspects: one is to use silica as the base, modify its surface with a modifier, and then graft the polymer; the other is to use the polymer as the base, and then graft it. branch modifier, and then graft silica. To modify nanosilica, it is generally dispersed in an organic solvent and then a modifier is added.   Introducing inorganic nanoparticles into the adhesive for modification can improve its tensile bonding strength and elongation at break. When the dosage of nanoparticles is within a certain range, the nanoparticles can be well dispersed into the adhesive matrix. Because of their huge specific surface area, they can interact strongly with the adhesive matrix, thus improving the mechanical properties of the adhesive. However, if the dosage exceeds a certain range, serious agglomeration will occur, the particle interface area will be reduced, the interaction between the nanoparticles and the adhesive matrix will also be weakened, and the content of reactive nanoparticles will be reduced, resulting in a reduction in its mechanical properties. . The mechanical property test results of the nano-modified adhesive show that when the dosage of nano-silica particles is 4%, the various performance indicators of the modified adhesive reach the maximum value.   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.

The water resistance of polyvinyl alcohol was improved by cross-linking with maleic acid (commonly known as maleic acid, MA). The esterification crosslinking of PVA membrane is achieved through the esterification reaction between PVA molecule and MA at high temperature. The esterification crosslinking reaction actually introduces carbonyl group into the polymer chain of PVA, forming a new polymer, but the main chain of the whole PVA polymer remains unchanged.   The PVA after esterification with MA only has chemical crosslinking, and does not produce a stable crystal structure, so the PVA film is easy to be swollen by water and destroy the structure of the film. Therefore, the PVA film should be heat treated. Since the esterification reaction in the liquid phase is characterized by reversibility, the crosslinking of polymers in the PVA film during the heating process makes the esterification reaction irreversible due to the partial water that has not been removed in the casting liquid and the complete volatilization of the water generated by the esterification reaction of PVA and MA, and the cross-linked PVA film is stable.   PVA can improve the water resistance and poor mechanical properties of PVA by chemical crosslinking with MA. Proper concentration of crosslinker and heat treatment conditions can make PVA obtain better water resistance.   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 alcohol (PVA) contains a large number of hydrophilic hydroxyl groups, which exhibit strong affinity for water during external drying and wetting changes. The use of epoxy resin, with high bonding strength and good stability, as a modifier for PVA is mainly because the epoxy groups in the epoxy resin can react with the hydroxyl groups in PVA to form ethers. To carry out the epoxy resin modification method of PVA, measure the required amounts of PVA and water and add them separately to three-necked flasks equipped with stirring and reflux devices. Start stirring and raise the temperature to 90°C, maintaining the reaction for 1 hour to obtain a PVA aqueous solution of a certain concentration. Cool it to 70°C, increase the stirring speed, and add a specific amount of epoxy resin to the glue solution. Maintain the reaction at this temperature for 2 hours to obtain epoxy resin-modified PVA.   Through orthogonal experiments, it has been determined that the optimal reaction conditions for PVA modification are a PVA concentration of 8%, modification time of 2 hours, epoxy resin addition of 2.4% (mass fraction), and modification temperature of 60°C. Under these conditions, the modified PVA exhibits excellent performance in terms of curing degree, which reaches 89.6%, significantly higher than the curing degree of unmodified PVA, which is 64.5%.   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 alcohol (PVA) is a versatile synthetic polymer that has found various applications in the field of modern traditional Chinese medicine (TCM) preparations. Its unique properties make it suitable for use in different dosage forms, including tablets, capsules, and topical formulations.  One of the main applications of PVA in TCM preparations is as a film-forming agent. It can form a thin, flexible, and transparent film when applied onto the surface of a tablet or capsule. This film helps in improving the appearance, stability, and shelf-life of the product. Additionally, the PVA film can act as a barrier, protecting the active ingredients from moisture, oxygen, and other environmental factors.   PVA can also be used as a binder in the formulation of TCM tablets. By adding PVA to the powder mixture,it enhances the cohesion and compressibility of the blend, resulting in tablets with improved mechanical strength and reduced friability. This ensures that the tablets retain their integrity during handling, packaging, and transportation.   Furthermore, PVA can serve as a viscosity modifier and suspending agent in liquid TCM formulations. By adjusting the concentration of PVA, it is possible to control the flow and rheological properties of the liquid, allowing for better dispersion and suspension of the active ingredients. This is particularly useful for TCM preparations that contain insoluble or poorly soluble herbal extracts or powders.   Another important application of PVA in TCM preparations is as a component in transdermal patches or topical formulations. Due to its biocompatibility and adhesive properties, PVA can act as a matrix material for delivering TCM active ingredients through the skin. The PVA matrix provides controlled release and prolonged drug delivery, facilitating the absorption of the herbal components into the systemic circulation.   In summary, polyvinyl alcohol has shown great potential in the field of modern traditional Chinese medicine preparations. Its film-forming, binding, viscosity modifying, and transdermal delivery properties contribute to the development of high-tech plastic packaging and improved product formulations, enhancing the efficacy and quality of TCM products.   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.