光固化单体甲基丙烯酸甲氧基乙酯的工艺研究

Study on the Synthesis Technology of Photocurable Monomer Methoxyethylmethacrylate

以甲基丙烯酸和乙二醇单甲醚为原料,活性炭负载对甲苯磺酸为催化剂,在带水剂、阻聚剂的作用下催化合成甲基丙烯酸甲氧基乙酯。考察了原料配比、催化剂用量、阻聚剂用量、反应时间对酯化率的影响;最佳工艺条件为:醇与酸的物质的量比1.7∶1,催化剂用量为原料总质量(醇与酸的总和,下同)的3%,阻聚剂用量为原料总质量的0.15%,反应时间4 h。该工艺条件下酯化率达80.1%以上;同时建立了该酯化合成的表观动力学模型,得到相应的反应速率方程。

Methoxyethyl methacrylate was synthesized by the reaction of methacrylic acid and ethyleneglycol monomethyl ether, at the presence of activated carbon loaded with p - tolu- enesulfonic acid as catalyst, together with water - carrier and polymerization inhibitor. The effects of such factors as the ratio of raw materials, the amount of catalyst, the amount of poly- merization inhibitor and reaction time on the esterification degree were investigated. The opti- mum synthesis conditions were as follows： n（ MAA ） ： n （EM） = 1： 1.7, catalyst （3% of the total mass of the raw materials） , polymerization inhibitor （0. 15% of the total mass of the raw materials）, reaction time （4 h）. The esterification degree was up to 80. 1% under such process conditions and the apparent kinetics model was established.