The application of Polyvinyl Alcohol1788 and Polyvinyl Alcohol1799

Polyvinyl Alcohol 1788 aqueous solution at room temperature with time viscosity increases. But the concentration of 8% when the viscosity is absolutely stable, independent of time, the special phenomenon of C polyvinyl alcohol film is good, ill gas height for many gas in addition to water vapour and ammonia. Good light resistance, not affected by illumination. Lit fire can burn, there is a special smell. Aqueous solution in storage, can appear sometimes poisonous variable. Non-toxic, non irritating to human skin. Used as emulsifying stabilizer polyvinyl acetate emulsion polymerization. Used in the manufacture of water soluble adhesive. Modifier starch adhesive. It is also can be used for the preparation of photosensitive resistance and benzene solvents. And is also used as a mold release agent, dispersing agent. It should be stored in a cool, dry place. And it should be payed attention to moisture proof and fire prevention.

Polyvinyl alcohol 1799 is also called sizing resin, referred to as PVA 1799. It is a kind of white or yellowish powder or floc solid. The glass transition temperature of 85 ℃, saponification value is 3 to 12mgKOH / g. Dissolved in 90 to 95 ℃ hot water, almost insoluble in cold water. The concentration of aqueous solution of more than l0%, at room temperature will gel gel, high temperature will be thin to restore liquidity. In order to make the viscosity stability, can be added to the amount of sodium thiocyanate in solution, calcium thiocyanate phenol, butyl alcohol, such as viscosity stabilizer. Polyvinyl Alcohol 1799 solution on commission sand caused gel than Polyvinyl Alcohol l788 more sensitive, solution quality 0.1% borax will make 5% Polyvinyl Alcohol 1799 aqueous gel, borax amount caused by the same concentration of Polyvinyl Alcohol 1788 solution gelation needs 1%. The polyvinyl alcohol water solution of the same concentration, the same degree of alcoholysis, borax boric acid occurs more easily than gel.

Polyvinyl Alcohol 1799 is than Polyvinyl Alcohol 1788 on benzene, chlorinated hydrocarbons, esters, ketones, ethers, aromatic hydrocarbon solvent tolerance ability. Heating above to 100 ℃ fade, 150 ℃ soon discoloration decomposition, will be higher than 200 ℃. Discoloration of the properties can be obtained by adding 0.5% to 3% boric acid and inhibition of polyvinyl alcohol heating. Good light resistance, not affected by illumination. With etherification, esterification, acetal reactivity with long chain polyol. Lit the fire burns, there is a special smell. Non-toxic, non irritating to human skin.

Polyvinyl Alcohol 1799 is mainly used in the manufacture of high viscosity polyvinyl butyral. It is widely used as sizing material dispersing agent. Other types of Polyvinyl Alcohol 1799 for polyvinyl acetate emulsion polymerization of emulsion stabilizer, but not as effective as Polyvinyl Alcohol 1788, Polyvinyl Alcohol 1799 and is generally Polyvinyl Alcohol 1788 mixed use. Polyvinyl Alcohol 1799 is used for the manufacture of polyvinyl formal solution (mainly l 07 building glue). And 1799 is also used for the preparation of high benzene solvents.