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利用多聚甲醛与氰乙酸乙酯在催化剂作用下得到氰基丙烯酸乙酯缩聚物,然后在同一反应器内连续完成脱水、脱溶剂及缩聚物裂解,对裂解得到的粗单体在高真空下精制,获得α-氰基丙烯酸乙酯单体。讨论了原料配比、催化剂用量、真空度、磷酸及增塑剂对产品收率的影响,确定了最佳反应条件,收率以氰乙酸乙酯质量计可达到75%,α-氰基丙烯酸乙酯纯度大于99.6%,并且常温密封条件下可贮存2年,能够满足各种型号α-氰基丙烯酸乙酯胶黏剂的配制要求。
Using paraformaldehyde and ethyl cyanoacetate under the action of a catalyst to obtain ethyl cyanoacrylate polycondensate, and then continuously dehydrating in the same reactor, removing the solvent and cracking the polycondensate, cracking the resulting crude monomer under high vacuum Refined to obtain α-cyanoethyl acrylate monomer. The effects of raw material ratio, catalyst dosage, degree of vacuum, phosphoric acid and plasticizer on the yield of the product were discussed. The optimal reaction conditions were determined. The yield was 75% by mass of ethyl cyanoacetate, Ethyl ester purity of more than 99.6%, and room temperature seal conditions can be stored for 2 years, to meet the various types of α-cyanoethyl acrylate adhesive preparation requirements.