早强型聚羧酸高性能减水剂的研制

Development of Polycarboxylic Acid Water Reducing Agent for Low Gas Diversion

预制混凝土构件生产要求聚羧酸系减水剂具有良好减水分散和提高混凝土早期强度效果,通常使用减水剂与有机、无机早强剂及其他小料复合而成,早强效果不明显且易产生沉淀和分层。文中选用不同厂家4000分子量聚醚单体,采用酸醚比为4:1,引入部分丙烯酰胺,调整引发剂品种和用量并采取合适工艺,合成出具有早期强度高和分散效果好的聚羧酸高性能减水剂。

The production of precast concrete members requires polycarboxylate superplasticizers to have good effects of reducing water dispersion and improving the early strength of concrete.Usually,superplasticizers are compounded with organic and inorganic early strength agents and other small materials,and the early strength effect is not obvious,and precipitation and delamination are easy to occur.In this paper,4000 molecular weight polyether monomers from different manufacturers were selected,the ratio of acid to ether was 4:1,part of acrylamide was introduced,the variety and dosage of initiator were adjusted and appropriate technology was adopted to synthesize polycarboxylic acid high performance water reducer with high early strength and good dispersion effect.