新型聚羧酸系减水剂在建筑石膏中的应用研究.pdfVIP

学兔兔 全国中文核心期刊 钎癯 盔蟓 新型聚羧酸系减水剂在建筑石膏中的应用研究 孙浩，龚雁。毛明富，倪忠斌。陈明清，刘士荣 (江南大学 化学与材料工程学院，江苏 无锡 214122) 摘要：研究了聚羧酸系减水剂对建筑石膏流动度及石膏晶体形貌的影响。采用大分子单体法合成了新型聚羧酸减水剂PC一1， 并与2种市售同类减水剂PC—S、PC—B进行比较。结果表明，聚羧酸型减水剂可以提高建筑石膏的流动性和强度，其中，PC一1掺量 为1．5％时，减水率达21．4％；掺量为0．7％时，建筑石膏的抗折强度提高3l％、抗压强度提高76％。其多种活性基团提高了螯合能力和 分散稳定性，促使建筑石膏形成网状结构。 关键词：聚羧酸减水剂；建筑石膏；流动度 中图分类号：Tu52g．042．2；TQ177．3 文献标识码：A 文章编号：1001—702X(2011)01—0054—03 Application study on bml~ng gypsum with polycarboxylate water reducer SUN Hao，GONG Yon，MA0 Min~~u，NI Zhongbin，CHEN Mingqing，LIU Shirong (School of Chemical and Material Engineering，Jiangnan University，Wuxi 214122，Jiangsu，China) Abstract：Effects of the polyearboxylic water reducer on fluidity and crystal morphology of building gypsum were investigated． Novel polycarboxylic water reducer(PC-1)was first synthesized by using macromonomer method，then the comparison researches were done using two same kind of water reducers(PC-S，PC-B)on sale．The results show that the polycarboxylic water reducer can improve the fluidity and strength of building plaster．When the dosage of PC一1 is 1．5％．water—reducing rate of gypsum is up to 21．4％：and the tensile strength and compressive strength of building gypsum can be enhanced by 31％．76％ respectively when the dosage is O．7％．The chelating capacity and dispersion stability are enhanced by a variety of active groups in PC一1．which make the gypsum has a network structure． Key words：polycarboxylic water reducer；building gypsum；degree of fluidity 我国的石膏矿产资源丰富，此外工业副产化学石膏的排 纳米磷钨酸为催化剂，先合成大分子单体，再经聚合反应合成