Polyvinyl Alcohol 1799

1 PVA (PVA 088-20 & PVA 1788) water resistance modification PVA (Polyvinyl alcohol) has very low air permeability and is a high-barrier packaging material with excellent performance. Because the molecular chain contains a large number of hydroxyl groups and has high hydrophilicity, these hydroxyl groups are easy to form hydrogen bonds with water molecules under high humidity, resulting in changes in the aggregate structure of PVA, causing its barrier properties to drop sharply. Therefore, necessary water resistance modification should be carried out on PVA to reduce the effect of humidity on the barrier properties of PVA. The mechanism of PVA water resistance modification is to cross-link PVA by adding a cross-linking agent, and completely or partially block the hydroxyl groups, which can reduce its hydrophilicity and achieve the purpose of improving water resistance. The 8511 Institute of the China Aerospace Corporation has developed a melamine resin modified liquid "868" that has no toxic side effects on the human body. "868" is a multifunctional polycondensate. When the amount added is not large, it can moderately cross-link with the hydroxyl groups in PVA, so that PVA forms a strong three-dimensional structure coating, which determines the air tightness of PVA under wet conditions and improves water resistance. This modified PVA coating liquid will not form a skin at room temperature, will not swell or fall off when in contact with water, and can be used for glue preparation and coating at room temperature.   2 PVA (PVA 100-27 & PVA 1799)water-soluble modification PVA's water solubility can be used to make water-soluble films. Water-soluble films are a new type of green and environmentally friendly packaging material, which is widely used in the packaging of various products in Europe, America, Japan and other countries. For example, pesticides, fertilizers, pigments, detergents, water treatment agents, concrete additives, detergents, chemical reagents for photography and chemical reagents for gardening care. Because the water solubility of pure PVA film cannot meet the requirement of dissolution time ≤ 300s in water at 20℃, Wen Huojiang et al. carried out Michael addition reaction with PVA and acrylamide, and then hydrolyzed and synthesized modified PVA under base catalysis. Water-soluble anionic groups were introduced into the PVA molecular chain to enhance the solubility. Water-soluble films were prepared using this as raw material, and the relationship between the amount of alkali, acrylamide and modification rate was discussed. The modification rate made a great contribution to the low-temperature rapid solubility of the prepared film within a certain range. The effect on water solubility beyond a certain range was not significant, but it would lead to excessively high costs.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com

We used partially alcoholysis PVA-217SB (PVA080-22 & PVA1780) and high-efficiency environmentally friendly pulp together, and added a certain proportion of starch. We conducted experiments on several polyester-cotton varieties, which not only significantly improved the pulp shaft quality, but also greatly reduced the pulp cost.   Pulp performance: The chemical structure of PVA varies depending on the degree of alcoholysis. PVA with an alcoholysis degree of 99.6% is fully alcoholysis, like the PVA-1799 (PVA 100-27) we usually work with. On the other hand, PVA with an alcoholysis degree of 88% is partially alcoholysis, such as PVA-1788 (PVA 088-20) and PVA-217SB. The fully alcoholysis PVA mainly has hydroxyl groups in its structure, whereas the partially alcoholysis version contains some ester groups along with hydroxyl groups. This difference makes their performance quite distinct. For example, when mixing partially hydrolyzed PVA with completely hydrolyzed PVA and starch, the starch ratios needed aren't too different between the two. Generally, it should not exceed 70%, that is, the starch to PVA mixing ratio is generally about 7:3, in order to obtain a slurry with good miscibility. Runli's eco-friendly slurry is a milky white liquid that has over 98% effective ingredients. It has a viscosity of 2 to 8 mPa·s at 20℃ and a pH level between 7.5 and 8.5. This slurry flows well, has good elasticity, strong adhesion, mixes easily with other slurries and additives, and it's simple to remove after use.     Summary: (1) From the trial, tracking, and test analysis of Runli slurry and partially hydrolyzed PVA, we found that the slurry flow rate is stable and it is not easy to form sizing skin at low temperature. The thousandth reel is smooth, the sizing yarn feels smooth, and there is less regenerated hairiness. (2) The new sizing yarn indicators are way better than the old formula. We’ve seen a big drop in loom breakage and a solid increase in the good axis rate and loom efficiency. (3) The use of Runli sizing agent and partially alcoholysis PVA (PVA-217SB) sizing agent has greatly reduced the sizing cost.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com  

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 (PVA 100-27 & PVA 1799) 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.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com