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以改性聚醚(TPEG)、甲基丙烯酸(MAA)和丙烯酰胺(AM)为主要原料,在引发剂和分子量调节剂作用下,在水溶液中共聚合成TPEG-MAA-AM三元共聚高效减水剂。考察了单体摩尔比、引发剂用量、反应温度和反应时间等合成条件对减水剂性能的影响规律。结果表明,最佳的减水剂合成条件为:n(TPEG)∶n(MAA)∶n(AM)=1∶1.3∶0.9,引发剂质量为单体总质量的5%,反应温度为75℃,反应时间为4h。在上述条件下制得的减水剂具有良好的分散性,掺入该减水剂0.2%(质量分数),水灰比为0.29时,水泥的净浆流动度可达到295mm。抗压强度测试表明,该种减水剂应用于混凝土多孔砖砌体中具有较好的力学性能。
The modified polyether (TPEG), methacrylic acid (MAA) and acrylamide (AM) as the main raw materials, initiator and molecular weight regulator in the aqueous solution of copolymerization TPEG-MAA-AM terpolymerization high efficiency minus Liquid agent. The effects of synthesis conditions such as monomer molar ratio, initiator amount, reaction temperature and reaction time on the performance of superplasticizer were investigated. The results showed that the optimal conditions for the synthesis of water-reducing agent were as follows: n (TPEG): n (MAA): n (AM) = 1: 1.3: 0.9; initiator mass was 5% of the total monomer mass; ℃, the reaction time is 4h. The superplasticizer obtained under the above conditions has good dispersibility. When the superplasticizer is mixed with 0.2% (mass fraction) of the superplasticizer and the water-cement ratio is 0.29, the fluidity of cement paste can reach 295mm. Compressive strength tests show that the superplasticizer used in concrete perforated brick masonry has good mechanical properties.