PVB CAS#63148-65-2

PVB CAS#63148-65-2

PVB resin has certain chemical stability, but it can be decomposed in acidic or alkaline (especially acidic) medium. It starts to decompose thermally after being heated to 100°C, and will be almost completely decomposed at 200–240°C. Hydrolysis can occur in dilute acid, at this time intermolecular cross-linking can occur, a small amount of double bonds is formed in the chain, and the acetate group will be further hydrolyzed. Heated in concentrated acid to form a transparent solution, while decomposing into aldehydes. Upon heating in dilute alkali solution with alkali concentration less than 1%, the free acid in PVB resin is neutralized and the thermal stability of the resin is improved. However, when PVB resin is heated with 3% alkaline solution to boiling, the acetate groups can be further hydrolyzed and saponified.

Product Application of PVB CAS#63148-65-2

The main application of poly(vinyl butyral) is as interlayers in safety glass laminates. In this application, a pure (colourless, light-stable) product with high hydroxyl content (for good adhesion) is required. Such material is preferably prepared from poly(vinyl alcohol) rather than directly from poly(vinyl acetate). In a typical process, completely hydrolysed poly(vinyl alcohol) is suspended in ethanol and then butyraldehyde and a small quantity of sulphuric acid (catalyst) are added. The mixture is heated at 800℃ for 6 hours. Water is then added to the product with rapid agitation and the poly(vinyl butyral) is precipitated as granules, which are washed with alkali and dried.

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