公开(公告)号：US20160237193A1

公开(公告)日：2016-08-18

申请号：US14829505

申请日：2015-08-18

Applicant: BEIJING UNIVERSITY OF TECHNOLOGY

Inventor： XIAO LIU ,  ZIMING WANG ,  MING ZHAO ,  SUPING CUI ,  MINGZHANG LAN

IPC: C08F267/06

CPC classification number: C08F267/06 ,  C08F8/06 ,  C08F8/12 ,  C08F265/00 ,  C08F265/04 ,  C08F218/12 ,  C08F216/06

Abstract: This invention relates to a method for preparing a polycarboxylate superplasticizer by graft copolymerization of fatty acid vinyl ester onto acrylate polymer. In this invention, a type of polycarboxylate superplasticizer by graft copolymerization of fatty acid vinyl ester onto acrylate polymer was synthesized by the processes of polymerization-grafting-alcoholysis-hydrolysis with acrylate and fatty acid vinyl ester as main reactants. In the first polymerization step, the polyacrylate was synthesized by using acrylate as monomer and a certain amount of initiator and molecular weight regulator. In the second graft copolymerization step, the graft polymer with polyacrylate as main chain and poly(fatty acid vinyl ester) as side chain was synthesized by graft copolymerization between polyacrylate and fatty acid vinyl ester. The final polycarboxylate superplasticizer product with polyacrylic acid as main chain and polyvinyl alcohol as side chain was obtained by subsequent alcoholysis and hydrolysis steps. The preparation process of this invention exhibited some characteristics including simpleness, easy controlling, low cost, environmental friendliness and pollution free. The fatty acid vinyl ester was as a reactant instead of conventional polyethylene glycol macromonomer, which enriched the applicable scope of reactive raw materials. The prepared polycarboxylate superplasticizer showed good cement paste fluidity and fluidity retention, which manifested as good adaptability to cement and application performance in concrete.

Abstract translation: 本发明涉及一种通过将脂肪酸乙烯基酯接枝共聚到丙烯酸酯聚合物上制备聚羧酸酯超增塑剂的方法。 在本发明中，通过丙烯酸酯和脂肪酸乙烯基酯作为主要反应物的聚合接枝 - 醇解 - 水解方法，合成了一种通过脂肪酸乙烯基酯接枝共聚丙烯酸酯聚合物的多羧酸酯超增塑剂。 在第一聚合步骤中，通过使用丙烯酸酯作为单体和一定量的引发剂和分子量调节剂来合成聚丙烯酸酯。 在第二次接枝共聚步骤中，以聚丙烯酸酯为主链的接枝聚合物和聚（脂肪酸乙烯基酯）为侧链，通过聚丙烯酸酯与脂肪酸乙烯基酯的接枝共聚合成。 通过随后的醇解和水解步骤获得了以聚丙烯酸为主链和聚乙烯醇作为侧链的最终多羧酸酯超增塑剂产品。 本发明的制备方法具有简单易控，成本低，环保，无污染等特点。 脂肪酸乙烯基酯作为反应物代替常规的聚乙二醇大分子单体，其丰富了反应性原料的适用范围。 制备的聚羧酸酯超增塑剂具有良好的水泥浆流动性和流动性保持性，表现为对水泥的适应性和混凝土的应用性能。