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以对甲氧基苯酚为阻聚剂,氨基磺酸为催化剂,环己烷为带水剂进行丙烯酸与新戊二醇酯化反应合成二丙烯酸新戊二醇酯。考察了阻聚剂、催化剂及带水剂的种类与用量、反应物醇酸比、反应温度、反应时间对反应结果的影响,确定了最佳的工艺条件。在n(丙烯酸)∶n(新戊二醇)为2.4∶1,对甲氧基苯酚、氨基磺酸、环己烷分别为反应物总质量的1.0%(质量)、0.5%(质量)、40%~50%(质量)条件下,反应温度为80~90℃,反应时间为6h,新戊二醇双酯化率可达90%以上。所得产物经减压蒸馏分离精制得到二丙烯酸新戊二醇酯,其纯度为98%。
Using p-methoxyphenol as polymerization inhibitor, sulfamic acid as catalyst and cyclohexane as water-bearing agent, esterification of acrylic acid with neopentyl glycol to synthesize neopentyl glycol diacrylate. The effects of polymerization inhibitor, type and amount of catalyst and water-carrying agent, the ratio of alkyd to reactant, reaction temperature and reaction time on the reaction were investigated. The optimum technological conditions were determined. In the n (acrylic acid): n (neopentyl glycol) 2.4: 1, p-methoxyphenol, sulfamic acid and cyclohexane were 1.0 mass%, 0.5 mass% 40% ~ 50% (mass) conditions, the reaction temperature is 80 ~ 90 ℃, the reaction time is 6h, neopentyl glycol double esterification rate of up to 90%. The resulting product was isolated and purified by distillation under reduced pressure to obtain neopentyl glycol diacrylate with a purity of 98%.