【摘要】 以丙烯酸和甲氧基聚乙二醇为主要原料,采用直接酯化法合成了聚羧酸系减水剂大分子单体(甲氧基聚乙二醇丙烯酸酯)。探讨了丙烯酸与甲氧基聚乙二醇摩尔比、催化剂和阻聚剂的用量、反应温度及反应时间对酯化反应的影响。得出最佳合成条件:丙烯酸与甲氧基聚乙二醇摩尔比为1.5,对甲苯磺酸的用量为甲氧基聚乙二醇质量分数为3%,对苯二酚的用量为丙烯酸质量分数的1.5%,甲苯用量为反应物总量的30%,反应温度为130℃,反应时间为6 h,酯化率可达96.8%。更多还原

【Abstract】 Macromonomer for polycarboxylic acid type water-reducers(polyethylene glycol acrylate) was synthe-sized by direct-etherification with methoxy polyethylene glycol and acrylic acid as primary materials.The effects of mole ratio of acrylic acid to methoxy polyethylene glycol,amount of catalyst and inhibitor,reaction tempera-ture and the reaction time on esterification were investigated.The conversion of product reaches 96.8% under the optimal experiment condition:the mole ratio of acrylic acid and methoxy polyethylene glycol is 1.5,the a-mount of p-methyl benzene sulfuric acid is 3% according to the mass of methoxy polyethylene glycol,the a-mount of hydroquinol is 1.5% according to the mass of acrylic acid,the amount of toluene is 30% according to the mass of total reactant,the reaction temperature is120℃and the reaction time is 6 h.更多还原