APEG-MAH-AMPS醚类聚羧酸系水泥减水剂的合成

发布时间：2018-03-02 18:20

  本文选题：水泥　切入点：聚羧酸　出处：《山西大学学报(自然科学版)》2017年01期 　论文类型：期刊论文

【摘要】：以烯丙基聚氧乙烯醚2000(APEG2000)、马来酸酐(MAH)和2-丙烯酰胺-2-甲基丙磺酸(AMPS)为原料,以过硫酸铵-亚硫酸钠为引发体系,合成出醚类聚羧酸系水泥减水剂。经正交试验选出最佳合成工艺条件:APEG与MAH摩尔比为1∶2,APEG与AMPS摩尔比为1∶0.4,过硫酸铵-亚硫酸钠引发体系质量占聚合单体总质量的1.5%,聚合时间6h,聚合温度45℃。该条件下单体转化率为93.68%,水泥净浆初始流动度为242mm,坍落度为199mm。采用傅立叶变换红外光谱仪(FTIR)对聚合物分子结构进行了表征;通过扫描电镜(SEM)和X射线衍射(XRD)对加入该减水剂的硬化水泥石微观结构进行了分析,结果表明,减水剂的加入减慢了水泥凝胶体向结晶体转变的过程,同时加快了水泥的水化程度。
[Abstract]:Using allyl polyoxyethylene ether 2000 (APEG2000), maleic anhydride (MAH) and 2-acrylamide (2-methylpropanesulfonic acid) (AMPS) as raw materials, ammonium persulfate and sodium sulfite were used as initiators. Ether polycarboxylic acid series cement superplasticizer was synthesized by orthogonal test. The optimum reaction conditions were obtained: the molar ratio of 1: APEG to MAH was 1: 2, APEG to AMPS was 1: 0.4, and the mass of initiator system of ammonium persulfate and sodium sulfite was 1.5% of the total mass of monomer. The polymerization time was 6 h, the polymerization temperature was 45 鈩，

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