【摘要】 通过丙烯酸与端羟基壬基酚聚氧乙烯基醚的酯化反应,制得含有双键和聚氧乙烯长链的大分子单体,并将其作为聚羧酸盐高效减水剂的单体.研究了大分子单体制备中酸醇摩尔比、催化剂用量、反应温度、反应时间等对羧基转化率的影响,结果表明:酸醇摩尔比1.5、催化剂用量1.2%、反应温度130°C,酯化反应时间8h是制备丙烯酸聚氧乙烯酯大分子单体的最佳工艺条件.通过傅立叶变换红外光谱对大分子单体进行了表征,结果表明已得到预期结构的丙烯酸聚氧乙烯酯大分子单体.更多还原

【Abstract】 The macromonomer with double bond and long chain of polyoxyethylene, which was used as the monomer of polycarboxylate high range water-reducer, was prepared by the esterification of polyoxyethylene ether and acrylic acid. The influence of n(acid)/n(alcohol), catalyst content, reaction temperature and reaction time on the conversion rate of carboxyl was discussed. The structure of macromonomer was characterized by FT-IR spectrum. The experimental results proved that the proper technologic conditions for the preparation of polyoxyethylene acrylate macromonomer are as follow: the n(acid)/n(alcohol) is 1.5, the catalyst content is 1.2%, the reaction temperature is 130 °C and the reaction time is 8 h. The results show that the macromonomer with proleptic structure is obtained assuredly.更多还原