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本文介绍在30℃的条件下采用水溶液自由基聚合的方法,将异戊烯醇聚氧乙烯醚(TPEG)与丙烯酸(AA)、甲基丙烯磺酸钠(MAS)共聚合成聚羧酸系减水剂;通过试验研究TPEG的分子量、TPEG与AA的摩尔比、链转移剂用量(相当于所有单体质量和的百分比)对水泥净浆性能影响;通过正交试验优化工艺,得到最佳的合成工艺为:TPEG分子量2400,n(TPEG):n(AA)=1.0:4.5,链转移剂3.0%,还原剂0.5g,TBHP 3.0g。采用最佳工艺合成的产品在掺量仅为水泥用量的0.15%(质量分数)时就具有良好的减水率。合成方法可免除蒸汽、节约能源、降低生产成本。
This article describes the use of aqueous solution of free radical polymerization at 30 ℃ under the conditions of the method, the isoprenol polyoxyethylene ether (TPEG) and acrylic acid (AA), sodium methanesulfonate (MAS) copolymerization of polycarboxylic acid minus The effects of TPEG molecular weight, molar ratio of TPEG to AA and chain transfer agent (equivalent to the percentage of all monomers) on the properties of cement paste were studied. The optimum process was obtained through orthogonal experiment The synthesis process is as follows: TPEG molecular weight 2400, n (TPEG): n (AA) = 1.0: 4.5, chain transfer agent 3.0%, reducing agent 0.5g, TBHP 3.0g. The products synthesized by the best technology have a good water-reducing rate when the dosage is only 0.15% (mass fraction) of the cement content. The synthesis method can eliminate the steam, save energy and reduce the production cost.