PVA 2488 & PVA 2499 is a white sheet, wool or powdered solids and tasteless.
The physical properties of PVA 2488 & PVA 2499 were affected by chemical structure, Alcoholysis, polymerization degree of impact. Polymerization degree of PVA 2488 & PVA 2499 is divided into high polymerization degree, higher degree of polymerization, polymerization and low degree of polymerization. Alcoholysis in General, and 78%, and 98% are three. The Alcoholysis of partial Alcoholysis usually 87%~89%, alcoholized Alcoholysis of 98%~100% completely. In General, the degree of polymerization increased, aqueous solution viscosity, film strength and increased solvent resistance, but solubility in water, the film elongation decreased. The relative density of PVA 2488 & PVA 2499 is (25 ° c/4 c) 1. 27~1. 31 (solid), 1. 02 (10%), melting point of 230 ℃, the glass transition temperature is 75~85℃, heated to more than 100 degrees in the air and slowly change color, embrittlement. Heated to 160~170℃ etherification of dehydration, loss of solubility, heats up to 200 ° c starts to break down. Contains more than 250 ℃ of conjugated polymers. Refractive index of 1. 49~1.52, thermal conductivity is 0. 2w/(m· K), specific heat capacity 1~5J/(kg · K), resistivity (3. 1~3. 8)×10Ω·cm。Soluble in water, in order to completely dissolve are usually required to be heated to 65~75℃.Insoluble petrol, kerosene, oil, benzene, toluene, ethylene dichloride, carbon tetrachloride, acetone, ethyl acetate, methanol and ethylene glycol. Slightly soluble in dimethyl sulfoxide. 120~150℃ soluble in Glycerin. But the gel when cooled to room temperature. Soluble PVA 2488 & PVA 2499 should be the first items while stirring add room temperature water. Distributed evenly after warming accelerated dissolution, thus preventing caking and affect dissolving speed.
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LIWEI CHEMICAL CO. LTD., As a subsidiary of Sinochem Corporation, Liwei PVA is the biggest manufacturer of PVA polyvinyl alcohol, PVA fibers in China. Liwei PVA is one of the top 10 PVA factories and the top 100 strongest enterprises in anhui province. Sinochem Corporation was built in 1971 and started production of PVA polyvinyl alcohol since 1978. We mainly deals in polyvinyl alcohol,PVA,PVA fiber and raw materials for producing PVA like vinyl acetate,calcium carbide.