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Synthetic method of polycarboxylate water reducer
The invention discloses a synthetic method of a polycarboxylate water reducer. The synthetic method comprises an esterification process and a polymerization process; the esterification process comprises the steps: stirring and heating polyethylene glycol monomethyl ether, methacrylic acid and toluenesulfonic acid, stirring and heating, vacuumizing and reacting, and after the reaction is finished,cooling and discharging to obtain a macromonomer; the polymerization process comprises the steps: adding a polyethylene glycol monomethacrylate solution and water into a four-neck flask, stirring andheating, slowly dropwise adding ammonium persulfate, acrylic acid and acrylamide, and keeping the temperature for half an hour to obtain the acrylamide modified polycarboxylate water reducer. According to the preparation method, methoxypolyethylene glycol, methacrylic acid and toluenesulfonic acid are stirred, heated, vacuumized, reacted and cooled to obtain the macromonomer, so that the preparation process is simplified, and the effective content of the macromonomer is guaranteed; the continuous esterification reaction of the macromonomers is terminated through rapid cooling, so that the reduction of the number of the esterified macromonomers in the mixture is inhibited, and the hydrolysis of the ester is reduced.
本发明公开了一种聚羧酸减水剂的合成方法，包括酯化工艺和聚合工艺；所述酯化工艺包括对聚乙二醇单甲醚、甲基丙烯酸和甲苯磺酸进行搅拌加热，搅拌加热，抽真空反应，待反应完成后，冷却到出料得到大单体；所述聚合工艺包括在四口烧瓶中加入聚乙二醇单甲基丙烯酸酯溶液和水，搅拌升温，缓慢滴加过硫酸铵、丙烯酸和丙烯酰胺，保温半个小时，可得丙烯酰胺改性聚羧酸减水剂。通过本发明对聚乙二醇单甲醚、甲基丙烯酸和甲苯磺酸进行搅拌加热抽真空反应后冷却到得到大单体，通过本发明的技术方案不仅简化了制备工艺，保证了大单体的有效含量；通过快速冷却终止大单体的继续酯化反应，以抑制混合物中酯化大单体数量降低，减少酯化物的水解。
Synthetic method of polycarboxylate water reducer
The invention discloses a synthetic method of a polycarboxylate water reducer. The synthetic method comprises an esterification process and a polymerization process; the esterification process comprises the steps: stirring and heating polyethylene glycol monomethyl ether, methacrylic acid and toluenesulfonic acid, stirring and heating, vacuumizing and reacting, and after the reaction is finished,cooling and discharging to obtain a macromonomer; the polymerization process comprises the steps: adding a polyethylene glycol monomethacrylate solution and water into a four-neck flask, stirring andheating, slowly dropwise adding ammonium persulfate, acrylic acid and acrylamide, and keeping the temperature for half an hour to obtain the acrylamide modified polycarboxylate water reducer. According to the preparation method, methoxypolyethylene glycol, methacrylic acid and toluenesulfonic acid are stirred, heated, vacuumized, reacted and cooled to obtain the macromonomer, so that the preparation process is simplified, and the effective content of the macromonomer is guaranteed; the continuous esterification reaction of the macromonomers is terminated through rapid cooling, so that the reduction of the number of the esterified macromonomers in the mixture is inhibited, and the hydrolysis of the ester is reduced.
本发明公开了一种聚羧酸减水剂的合成方法，包括酯化工艺和聚合工艺；所述酯化工艺包括对聚乙二醇单甲醚、甲基丙烯酸和甲苯磺酸进行搅拌加热，搅拌加热，抽真空反应，待反应完成后，冷却到出料得到大单体；所述聚合工艺包括在四口烧瓶中加入聚乙二醇单甲基丙烯酸酯溶液和水，搅拌升温，缓慢滴加过硫酸铵、丙烯酸和丙烯酰胺，保温半个小时，可得丙烯酰胺改性聚羧酸减水剂。通过本发明对聚乙二醇单甲醚、甲基丙烯酸和甲苯磺酸进行搅拌加热抽真空反应后冷却到得到大单体，通过本发明的技术方案不仅简化了制备工艺，保证了大单体的有效含量；通过快速冷却终止大单体的继续酯化反应，以抑制混合物中酯化大单体数量降低，减少酯化物的水解。
Synthetic method of polycarboxylate water reducer
一种聚羧酸减水剂的合成方法
ZHANG MORAN (author) / SUN WEN (author) / SHEN HAOZHE (author)
2021-02-19
Patent
Electronic Resource
Chinese
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