Polycarboxylate superplasticizer and preparation method thereof

The invention belongs to concrete admixtures, and particularly relates to a polycarboxylate superplasticizer and a preparation method thereof. Through molecular structure design, resin acid and ethylene oxide are subjected to addition condensation under the action of a base catalyst to obtain a rosin-based macromonomer, and the rosin-based macromonomer, unsaturated polyoxyethylene ether, unsaturated acid and the like are subjected to a copolymerization reaction to obtain the polycarboxylate superplasticizer. Under the synergistic effect of various groups, the polycarboxylate superplasticizer disclosed by the invention has the characteristics of high water-reducing rate, good workability and high adaptability. 本发明属于混凝土外加剂，具体涉及一种聚羧酸减水剂及其制备方法。本发明通过分子结构设计，采用树脂酸和环氧乙烷加成缩合，在碱催化剂的作用下，得到松香基大单体，再和不饱和聚氧乙烯醚、不饱和酸等发生共聚反应，得到所述的聚羧酸减水剂。在各种基团的协同作用下，本发明的聚羧酸减水剂具有减水率高，和易性好，适应性高的特点。