公开(公告)号：US20200223970A1

公开(公告)日：2020-07-16

申请号：US16571017

申请日：2019-09-13

Applicant: BEIJING UNIVERSITY OF TECHNOLOGY

Inventor： XIAO LIU ,  QIAN XU ,  ZIMING WANG ,  GUANGHONG LAI ,  JIANAN GUAN ,  SHANSHAN QIAN ,  XIABING BAI

IPC: C08F265/04 ,  C04B24/26 ,  C08F8/12 ,  C08F2/06 ,  C08F2/40

Abstract: A preparation method of comb structure temperature/pH-responsive polycarboxylic acid adopts acrylic ester, temperature/pH-responsive monomer and other raw materials to obtain polycarboxylic acid via acrylate monomer self-polymerization, grafting with temperature/pH-responsive monomers and hydrolyzation. In other words, acrylate is used as the reaction monomer to polymerize polyacrylate with controllable molecular weight under the action of initiator and chain transfer agent, then the graft copolymers are copolymerized with temperature/pH-responsive monomers to obtain graft copolymers with acrylate polymers main chain and temperature/pH-responsive polymer side chains. Finally, the graft copolymer is hydrolyzed to obtain the comb structure temperature/pH-responsive polycarboxylic acid with polyacrylic acid main chain and temperature/pH-responsive monomer side chain.

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。

公开(公告)号：US20140114030A1

公开(公告)日：2014-04-24

申请号：US13910785

申请日：2013-06-05

Applicant: BEIJING UNIVERSITY OF TECHNOLOGY

Inventor： XIAO LIU ,  ZIMING WANG ,  SUPING CUI ,  MINGZHANG LAN ,  QIANJIN MAO ,  HONGXIA GUO ,  YALI WANG ,  JINBO YANG ,  XIAOYU MA ,  JIE ZHU

IPC: C08F220/18

CPC classification number: C04B24/16 ,  C04B24/26 ,  C04B24/2641 ,  C04B24/2647 ,  C04B2103/308 ,  C04B2103/32 ,  C08F220/06 ,  C08F220/18 ,  C08F283/01 ,  C08F290/06

Abstract: This invention relates to a method for preparing a star-shaped polycarboxylate superplasticizer by the first esterification step with polyol and (meth)acrylic acid as main reactants and the second polymerization step. In the first step, the star-shaped polymerizable active ends were synthesized by esterification between polyol and (meth)acrylic acid in the presence of catalyst. In the second step, the final star-shaped polycarboxylate superplasticizer was prepared by radical polymerization among the product obtained in first step, unsaturated polyoxyethylene ethers, molecular weight regulator and unsaturated carboxylic acid in the presence of initiator. The production process of this invention exhibits some characteristics including simple, easily controllable, high polymerization degree, low cost and pollution free. The star-shaped molecular structure of polycarboxylate superplasticizer can be achieved through synthesizing active “core” by esterification and “arm” by radical polymerization. It showed better cement paste fluidity and fluidity retention, which manifested as better adaptability to cement and application performance in concrete, than both traditional linear and comb-shaped polycarboxylate superplasticizer at common or lower dosage.

Abstract translation: 本发明涉及通过第一酯化步骤制备星形聚羧酸酯超增塑剂的方法，其中多元醇和（甲基）丙烯酸作为主要反应物和第二聚合步骤。 在第一步中，在催化剂存在下，通过多元醇与（甲基）丙烯酸的酯化合成星形可聚合活性末端。 在第二步中，通过在引发剂存在下的第一步获得的产物，不饱和聚氧乙烯醚，分子量调节剂和不饱和羧酸之间的自由基聚合制备最终的星形聚羧酸酯超增塑剂。 本发明的制造方法具有简单，容易控制，聚合度高，成本低，无污染等特点。 聚羧酸酯超增塑剂的星形分子结构可以通过酯化反应合成活性“核”，通过自由基聚合“臂”来实现。 表现出较好的水泥浆流动性和流动性保持性，与常规或较低剂量的传统线性和梳状聚羧酸盐超增塑剂相比，其表现出较好的水泥适应性和混凝土的施用性能。