This paper introduces the function and application of polyvinyl alcohol in detail.
Firstly, the physical and chemical properties of Pva are introduced. Polyvinyl alcohol, also known as PVA, is a water-soluble organic compound, which is generally a white or cream solid. According to the data of huayuan.com, its chemical structure formula is [c2h4o]n, and its relative molecular weight is 44.053. Soluble in water, slightly soluble in dimethyl sulfoxide, insoluble in various organic solvents such as kerosene, petroleum ether, vegetable oil, benzene, toluene, dichloroethane, ethylene glycol, carbon tetrachloride, acetone, ethyl acetate, methanol, etc.
Secondly, polyvinyl alcohol is widely used. At present, as a chemical raw material, it can be used to manufacture polyvinyl acetal, gasoline resistant pipes, vinylon, paper coating, fabric treatment agent, adhesive, emulsifier, glue, etc. according to a study in 2019, the polyvinyl alcohol contained in the glue can be used as the culture medium of hematopoietic stem cells, allowing the hematopoietic stem cells from experimental mice to multiply hundreds of times, Thus greatly reducing the cost of hematopoietic stem cell culture, can help treat leukemia and other diseases.
Finally, the main industrial uses of polyvinyl alcohol include:
1. building adhesives and binders construction adhesives made from polyvinyl alcohol include putty adhesives, coating adhesive base materials, etc., and their scale accounts for more than 40% of the total. At present, the most widely used adhesives are pva17-99 and pva20-99 with medium viscosity and pva24-99 and pva26-99 with high viscosity. In addition to building glue, polyvinyl alcohol can also be used to make adhesives for paper, wood, textiles, office glue and high-grade paint base materials, which are mainly used for paper, wood, textiles, office glue and high-grade paint base materials. These adhesives have high technical content and require a high level of compounding.
2. the adhesive made of textile size and fiber polyvinyl alcohol has very good adhesion and film-forming property. It is cheap and good. It is mainly used for sizing pure polyester or polyester cotton yarn. Sometimes it is used for sizing high count pure cotton yarn together with acrylic size. Polyvinyl alcohol is the main raw material of vinylon fiber. It is used to manufacture staple fiber, long fiber, medium strength medium modulus, high strength high modulus, water-soluble fiber and other varieties. Among them, the high-strength and high modulus vinylon fiber is regarded as a "green and environment-friendly" high-tech material.
3. Polyvinyl Butyral (PVB) polyvinyl alcohol can also be used to make PVB films, and high-end PVB films can be used to make windscreens for automobiles and bulletproof glasses for military industry. With the rapid development of green energy, PVB films have also been widely used in the photovoltaic industry.
4. papermaking in order to improve the wear resistance, tear resistance and folding resistance of paper, paper surface sizing agent, pigment adhesive and beater additive made of polyvinyl alcohol are widely used in the papermaking industry.
5. biodegradable PVA film the film-forming, biodegradation and water degradation of polyvinyl alcohol make Polyvinyl Alcohol Film the favorite of new product packaging, and industrial research and development is gradually expanding and deepening.
