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    Additive for increasing early activity index of nickel slag and preparation method thereof
    1.
    发明授权
    Additive for increasing early activity index of nickel slag and preparation method thereof 有权

    公开(公告)号：US11142481B2

    公开(公告)日：2021-10-12

    申请号：US16814262

    申请日：2020-03-10

    Applicant: Beijing University of Technology

    Inventor： Yali Wang ,  Jianfeng Wang ,  Yunfang Lv ,  Zhenguo Wang ,  Yuanzhong Han ,  Shichao Zhang

    IPC: C04B24/00 ,  C04B7/147 ,  C07C213/06

    Abstract: An additive for increasing an early activity index of nickel slag and a preparation method thereof, belonging to the field of additive technologies, are provided. The preparation method includes: successively adding maleic anhydride and triethanolamine to a reactor; setting the heating temperature to 50° C. for reaction, where a large amount of heat is released during the reaction; when the reaction temperature decreases to 60° C. after heat is released in the reaction, allowing triethanolamine maleate to react with a solution of bromine in carbon tetrachloride; adding water to the mixture, where the weight percentage content of the added water is 60%; separating and removing carbon tetrachloride from water; and conducting uniform stirring to obtain the additive. A molar ratio of the maleic anhydride, the triethanolamine, and bromine is (0.2-1):1:(0.2-1), and a molar ratio of the maleic anhydride to the bromine is 1:1.

    Preparation method of high-performance star-shaped polycarboxylate superplasticizer
    4.
    发明授权
    Preparation method of high-performance star-shaped polycarboxylate superplasticizer 有权
    高性能星形聚羧酸酯超增塑剂的制备方法

    公开(公告)号：US08912299B2

    公开(公告)日：2014-12-16

    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: C04B24/26 ,  C04B24/16 ,  C08F290/06 ,  C08F220/18 ,  C08F220/06 ,  C04B103/32

    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。

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