分别以甲基丙烯磺酸钠(SMAS)等5类含磺酸基的不饱和单体,合成了5种侧链带有磺酸基团的梳形聚羧酸减水剂.用红外光谱(FT-IR)对其结构进行了确认.正交试验分析表明,SMAS是最佳的磺酸基单体,并用SMAS与丙烯酸、丙烯酸酯-聚乙二醇单甲醚共聚得到了一种新型聚羧酸高效减水剂(SPC3).应用试验结果表明,当水灰比(W/C)为0.29,掺入量为0.30%时,SPC3的减水率高达36%,而萘磺酸甲醛缩合物(SNF)减水剂的减水率只有17%.同样条件下,掺入SPC3制备的泵送混凝土在120 min的坍落度损失为8.9%,远小于掺入SNF时的65.0%.掺入0.30%的SPC3制备的高强度混凝土(HPC),其90d压缩强度达到71.6 MPa.
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