Preparation, Characterization and Performances of Powdered Polycarboxylate Superplasticizer with Bulk Polymerization

Materials

Xiao Liu¹  Suping Cui¹  Xu Liang¹  Huiqun Li¹  Mingzhang Lan¹  Jie Zhu¹  Ziming Wang¹  Yunsheng Zheng² 

[1] College of Materials Science and Engineering, Beijing University of Technology,Beijing 100124, China;State Key Laboratory of Solid Waste Reuse for Building Materials, Beijing 100041, China;

关键词: polycarboxylate;    superplasticizer;    powdered;    fluidity;    cement;   

DOI  :  10.3390/ma7096169

来源: DOAJ

【 摘 要 】

A polycarboxylate superplasticizer (PCE) was synthesized in a non-solvent system with bulk polymerization and then was pulverized into powdered form to achieve a rapid transportation and convenient preparation. PCE synthesized by using isopentenyl polyethylene glycol (TPEG) or isobutenyl polyethylene glycol (IPEG) as a macromonomer exhibited the best fluidities and retaining properties at 80 °C and 75 °C, respectively.Besides, azobisisobutyronitrile (AIBN) was suitable as an initiator, and the fumaric acid was suitable as the third monomer. The test results of 1H nuclear magnetic resonance(1H NMR) confirmed the occurrences of polymerization, and the measurement results of molecular weight and distribution showed that PCE molecular weight characteristics were in accordance with their fluidity properties in cement paste. The application performances in cement showed that PCEs with the best paste fluidity retentions had the longest final setting time and the shortest setting time interval, and the PCEs with good fluidity properties can obviously delay the hydration process and lower the hydration heat. Accordingly, this is a novel, energy-saving and economical method to prepare powdered PCE in the field of concrete admixtures.

【 授权许可】

Unknown