Polyvinyl Alchol PVA 1788 and PVA 1799

Architectural coatings commonly use Polyvinyl Alcohol PVA 1788 and PVA 1799. Polyvinyl Alcohol is derived from the hydrolysis of Polyvinyl Acetate, and can not derived by the polymerization of Vinyl Alcohol. Because Vinyl Alcohol is very unstable, there can be no free Vinyl Alcohol Monomer. The formula of Polyvinyl Alcohol is (CH2CH)OH, wherein the degree of hydrolysis and degree of polymerization has a great influence on the physical properties of Polyvinyl Alcohol. The polymerization degree of the Polyvinyl Alcohol can be divided into a high polymerization degree, medium polymerization degree and low degree of oligomerization, and recently, the development of an ultra-high degree of polymerization products.

There are three typically kinds of alcoholysis, namely, 78 %, 88 % and 98 %. The complete alcoholysis of Polyvinyl Alcohol is 98 % to 100 %, partial alcoholysis of alcoholysis typically is 87 % to 89 %. For convenience, we often fetching thousands of polymerization degree, rounded at the front, percentages in the back alcoholysis. Therefore, PVA 1788 means that polymerization is 1700, with diethylene glycol 88 %, PVA 1799 means that polymerization is 1700, with diethylene glycol 99 %.

PVA 1788 is with good water solubility, whether in cold water, was quickly dissolved in hot water, but PVA 1799 only dissolves in hot water at 95 ℃ or above. Due to Polyvinyl Alcohol PVA to neutral, at the time of dissolution does not need special corrosion requirements, but it’s best to use stainless steel or enamel reaction kettle, because these materials will not rust and contamination of the solution.

PolyvinylAlcohol PVA 1788 and PVA 1799 can be used for emulsion polymerization of Vinyl Acetate emulsion stabilizer. Polyvinyl Alcohol can be used in the manufacturing of water-soluble adhesives, and can be used as modification of starch adhesive agents. And also can be used to preparation of photosensitive adhesive and benzene class solvent resistant sealant. Polyvinyl Alcohol also can be used as release agents, dispersants and so on.