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Chemcial Industry and Engineering 2020, Vol. 37 Issue (6) :30-37    DOI: 10.13353/j.issn.1004.9533.20200114
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Synthesis of High Performance Polycarboxylate Superplasticizer
Shao Zhicheng, Guo Keyu, Liu Shiwei, Yu Shitao
College of Chemical Engineering, Qingdao University of Science and Technology, Shandong Qingdao 266042, China

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Abstract In order to save energy and reduce energy consumption, a high-performance polycarboxylate superplasticizer (PCE) was synthesized by the method of the simulated adiabatic conditions, isopentenol polyoxyethylene ether (TPEG), acrylic acid (AA), sodium methacryl sulfonate (SMAS) as the polymerization monomers, thioglycolic acid (TGA) as chain transfer agent, and ammonium persulfate-ascorbic acid (APS-Vc) as redox initiation system. The effects of the amount of AA, SMAS and TGA on the properties of the PCE were investigated. The optimal reaction conditions were obtained as following:n(TPEG):n(AA):n(SMAS):n(TGA)=1.00:4.00:0.20:0.18, initial reaction temperature 15℃ and polymerization time 4 h. Under the above reaction conditions, the weight average molecular weight, number average molecular weight and molecular weight distribution of the obtained PCE were 42 688, 36 409, and 1.172 5, respectively. And the properties of its solid content, cement slurry fluidity, slump and water reduction were better than those of PCE obtained by the traditional thermostatic polymerization. In addition, PCE could delay the hydration and hardening process of cement, promote the close arrangement of ettringite, and improve the mechanical strength of the cement such as compressive and flexural resistance.
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Shao Zhicheng
Guo Keyu
Liu Shiwei
Yu Shitao
Keywordsadiabatic reaction;   polycarboxylate superplasticizer;   fluidity;   cement hydration process     
Received 2020-03-16;
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Shao Zhicheng, Guo Keyu, Liu Shiwei, Yu Shitao.Synthesis of High Performance Polycarboxylate Superplasticizer[J]  Chemcial Industry and Engineering, 2020,V37(6): 30-37
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