研究了聚乙烯醇(PVA)和正丁醛在盐酸催化条件下,沉淀法合成聚乙烯醇缩丁醛(PVB).考察了m(正丁醛):m(PVA)、催化剂用量、乳化剂用量、低温反应时间(tL)、高温反应温度(TH)以及高温反应时间(TH)对缩醛反应的影响,结果表明,最佳合成工艺条件为:m(正丁醛):m(PVA)为2.2:1,催化剂的用量为13％(以正丁醛和PVA总质量计),乳化剂用量为1.9％(以正丁醛和PVA总质量计),在3～7℃反应3 h,45℃反应1 h的条件下,制备得到的聚乙烯醇缩丁醛的缩醛度可达到88.47％.%Polyvinyl butyral ( PVB) was synthesized by precipitation method with polyvinyl alcohol ( PVA) and n-butyraldehyde,and hydrochloric acid as catalysts.The effects of m( n-butylaldehyde):m(PVA),catalyst dosage ,dosage of emulsifier , reaction time (t L ) at low temperature , high temperature reaction temperature ( TH ) and reaction time ( tH ) at high temperature on the aldolization was discussed ,the results showed that the optimum process conditions were as follows:m( nb-utylaldehyde ): m( PVA) was2.2:1,catalyst dosage was 13％( total weight of n-butylaldehyde and PVA ) ,dosage of emulsifier was 1.9％( total weight of n-butylaldehyde and PVA),reaction time was 3 h at3～7 ℃,reaction time was 1 h at 45℃,the acetal degree of polyvinyl butyral is 88.47％.
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