一种聚羧酸保坍剂的合成及性能研究

摘要

采用水溶液自由基聚合法，将异戊烯醇聚氧乙烯醚（ TPEG）、丙烯酸（ AA）及保坍助剂小单体（ BTZ）共聚合成了聚羧酸保坍剂，探讨了AA与TPEG的摩尔比、保坍助剂的种类及用量、链转移剂用量、引发剂用量、聚合反应温度、单体滴加时间对保坍剂性能的影响。该保坍剂具有一定的减水率，可单独使用，也可以与普通聚羧酸减水剂复配使用。与普通聚羧酸减水剂复配使用时，新拌混凝土分散性及保坍性能优异。%The polycarboxylate slump retaining agent was synthesis by TPEG , acrylic acid ( AA) and retaining auxiliaries ( BTZ) in aqueous solution by free radical polymerization .The effects of molar ratio of AA to TPEG , type and amount of BTZ , dosage of chain transfer , dos-age of initiator , polymerization temperature , and dropping time of monomer on the performance of the polycarboxylate slump retaining agent were investigated .The polycarboxylate slump retaining agent has a certain water reducing rate , could be used alone or combined with ordi-nary polycarboxylic superplasticizer .When compound used , the fresh concrete has good dispersion and slump retention properties .