Method for preparing polyvinyl butyral resin by using polyvinyl acetate as raw material
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A technology of polyvinyl butyral resin and polyvinyl acetate, which is applied in the direction of coatings and adhesives, can solve the problems of low degree of acetalization and the inability to achieve high-quality polyvinyl butyral resin, and achieve improvement The effect of acetalization degree, easy control method and large profit margin
Active Publication Date: 2014-04-30
安徽皖维膜材料有限责任公司
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[0004] At present, most domestic enterprises use the precipitation method to manufacture polyvinyl butyral resin, but because the precipitation method requires reaction control and the degree of acetalization of the obtained products is generally low, it is impossible to achieve high-quality polyvinyl butyral Resin Requirements
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[0015] 1. Alcoholysis and condensation
[0016] Use methanol to make polyvinyl acetate into a solution with a mass concentration of 10-15%, heat it to 45°C, add hydrochloric acid with a mass concentration of 30%; continue to heat up the reaction solution to 55°C, add n-butyraldehyde, and react at 55°C for 4 hours , and then the temperature was raised to 65° C., and the reaction was continued for 2 hours. The mass ratio of polyvinyl acetate, n-butyraldehyde and hydrochloric acid is 9:2.8:2.2.
[0017] 2. Post-processing
[0018] Put the reaction solution prepared in step 1 into the water washing tank, add pure water under stirring, gradually precipitate polyvinyl butyral resin, wash with pure water in multiple steps to obtain polyvinyl butyral resin semi-finished products, and polyvinyl butyral resin The semi-finished butyral resin is sent to a drying tower at 100°C by a screw conveyor for drying to obtain a polyvinyl butyral resin with an acetalization degree of 77-85wt%.
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Abstract
The invention discloses a method for preparing polyvinyl butyral resin by using polyvinyl acetate as a raw material. The method comprises unit processes including alcoholysis, condensation and post-processing, wherein the alcoholysis and the condensation processes use polyvinyl acetate and butyraldehyde as the raw materials and hydrochloric acid as a catalyst. The alcoholysis and the condensation processes are firstly carried out at 45-55 DEG C for 3.5-4.5 hours in the presence of solvent, and then the reactions are continued for 1.5-2.5 hours after the temperature is raised to 60-65 DEG C to obtain a reaction solution. After the reactions are finished, the reaction solution is washed and dried to obtain the polyvinyl butyral resin with an acetalation degree of 77-85wt%. The method provided by the invention can effectively increase the acetalation degree of polyvinyl butyral and reduce the difficulty of reaction control.
Description
1. Technical field [0001] The present invention relates to a preparation method of polyvinyl butyral resin, specifically a method of preparing polyvinyl butyral resin with polyvinyl acetate as raw material, so as to obtain polyvinyl butyral resin with high degree of acetalization Polyvinyl butyral resin. 2. Background technology [0002] Polyvinyl butyral resin is non-toxic, odorless, non-corrosive, non-flammable, has good light transmission, insulation, wear resistance, water resistance, oil resistance, cold resistance, aging resistance, and low temperature impact resistance. It has special adhesion and light transmission to inorganic and organic glass. It has a strong combination of metals, ceramics, plastics, leather and wood. Its application fields are very extensive, and its main scale application fields include the manufacture of safety glass, coatings, inks, adhesives, ceramics, decals, papermaking, photovoltaic cell film, etc., and the market prospect is broad. ...
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