Characteristics and applications of polyvinyl alcohol (PVA)

Polyvinyl alcohol is an organic compound that appears as a white, flake, flocculent, or powdered solid, odorless. Soluble in water (above 95 ℃), slightly soluble in dimethyl sulfoxide, insoluble in gasoline, kerosene, vegetable oil, benzene, toluene, dichloroethane, carbon tetrachloride, acetone, ethyl acetate, methanol, ethylene glycol, etc. It has good solubility, adhesion, and membrane properties, and is widely used in many fields.

1. The bonding performance and solubility of polyvinyl alcohol are used as adhesives for cellulose fibers and synthetic fibers in the textile industry. It can improve the tensile strength, wear resistance, and softness of fibers. In addition, polyvinyl alcohol can also be used to prepare anti shrinkage agents for cellulose fibers, increasing fiber stability and reducing shrinkage rate.

2. Polyvinyl alcohol, as a water-soluble adhesive, is used for paper bonding and coating processing in paper production. It can increase the mechanical strength, moisture resistance, and smoothness of paper, making it have good printing performance and crack resistance.

3. The flexibility and transparency of polyvinyl alcohol films are widely used in the packaging fields of food, medicine, and industrial products. It can prepare high barrier packaging films, effectively protecting products from contamination by oxygen, water vapor, and odors. In addition, polyvinyl alcohol film can also be used for packaging frozen food to prevent frost formation during the freezing process.

4. Polyvinyl alcohol can be used as an adhesive and plasticizer. Improve the bonding strength, weather resistance, and frost resistance of building materials, as well as improve their corrosion resistance and waterproof performance. It can also be used to prepare high-performance building adhesives for the installation and repair of tiles, floors, and walls. In addition, polyvinyl alcohol is used as a soil stabilizer, with its viscosity and solubility, which can solidify soil, prevent soil erosion and geological disasters.

5. Polyvinyl alcohol can be used in the pharmaceutical field to prepare drug coatings and sustained-release agents, improving the stability and bioavailability of drugs. In addition, it can also be used to prepare medical devices and drugs such as artificial tears, soft contact lenses, and drug injections.

Finally, polyvinyl alcohol has a wide range of applications in the fields of environmental protection and water treatment. Due to its good water solubility and biodegradability, it can be used as a raw material for environmentally friendly materials, such as biodegradable plastics and soluble fertilizers. In addition, it can also be used as a water treatment agent, and through its hydrophilicity and solubility, it can remove suspended solids and organic matter in water, improving water quality.

In summary, polyvinyl alcohol, as an important synthetic polymer, has wide applications in many fields. With the development of technology, people's research and application of polyvinyl alcohol will continue to deepen, and it is believed that it will play an important role in more fields.

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