An Introduction of Polyvinyl Alcohol resins
Polyvinyl alcohol resin products of solid white, Flocculent, granular, powdery in appearance of three;Nonpoisonous and tasteless, pollution-free, can be dissolved in a 80--90 water.Its solution has good adhesion and film;Resistant to oils, lubricants, and most organic solvents such as hydrocarbons;With long-chain polyol ester, ether, Acetal, and other chemical properties.
Because free of ethylene glycol is very unstable, and cannot exist alone, to achieve the practical value of Polyvinyl alcohol, usually based on vinyl acetate monomer for polymerization, or made of hydrolyzed Polyvinyl alcohol and alcohol solution.
In the presence of ultraviolet rays, gamma rays, x-rays, and susceptible to free radical polymerization of vinyl acetate.Very pure vinyl acetate in anaerobic heating alone does not polymerize.In the presence of initiator, VAC can polymerize under relatively mild conditions.According to the different uses of polyvinyl acetate and industrial implementation there are many kinds of polymerization of vinyl acetate.Using polyvinyl acetate used in the manufacture of Polyvinyl alcohol fiber, usually using methanol as solvent use solvent polymerization.Polyvinyl acetate in methanol or Alcoholysis reaction under the action of sodium hydroxide while are Polyvinyl alcohol resin.
Mainly used in the textile industry in warp sizing, textile finishing agent, vinylon fiber raw materials;107 adhesive in building decoration industry, Interior and exterior wall coating, adhesive;In the chemical industry, Polyvinyl alcohol is used as emulsifier and dispersant and polyvinyl, Acetal, butyral resins;For pulp and paper industry paper adhesives;Agriculture for soil adhesion, pesticide Synergist and Polyvinyl alcohol films;Also used in cosmetics and high-frequency quenching agent and so on.