Making Latex Suitable for the Modification of Cement Paste by Selecting Water-soluble Monomer
HAN Dongdong1, CHEN Weideng1,2, ZHONG Shiyun1
1 Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University, Shanghai 201804; 2 Fujian Academy of Building Research, Fuzhou 350025
Abstract: Three water-soluble monomers with different molecular structures were selected to prepare the styrene-acrylate latex used for the modification of cement-based materials. The flowability test and the residue on sieve test of cement paste were applied to evaluate the stability of latex in cement paste. Results show that the stability of latex in cement paste increases with the increase of water-soluble monomer content (0%—4%). At the same content of water-soluble monomer, the latex containing N-methylol acrylamide (NMA) has the best stability when mixed with cement, followed by the latex containing acrylic acid (AA), then the latex containing hydroxyethyl methacrylate (HEMA). Which shows a good accordance with the inorganic value/organic value (I/O) of water-soluble monomer (I/O: NMA>AA>HEMA). It is also found that the content and structure of water-soluble monomer determine the critical coagulation concentration (CCC) of latex, and the higher CCC leads to the better stability of latex in cement paste. The greater the tendency of water-soluble monomer distributed on the surface of polymer particles contributes to the better stability of latex.
韩冬冬,陈维灯,钟世云. 水溶性单体对聚合物乳液在水泥浆体中稳定性的影响[J]. 《材料导报》期刊社, 2017, 31(24): 74-78.
HAN Dongdong, CHEN Weideng, ZHONG Shiyun. Making Latex Suitable for the Modification of Cement Paste by Selecting Water-soluble Monomer. Materials Reports, 2017, 31(24): 74-78.
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2017, Vol. 31 
