Abstract:This paper described the research of two-step synthesis of polycarboxylic superplasticizer, the contents of the subject and its significance briefly,and introduced the development of two-step synthesis of polycarboxylic superplasticizer in recent years at home and abroad ,and analyzed the mechanism of superplasticizer in essence. Moreover, it described the synthesis methods, techniques and experimental characterizaton method of two-step synthesis of polycarboxylic superplasticizer. Some data processing, comparison and analysis through the experimental materials from the choice experiment were made. The effect of initiator dosage, preparation from different mixed polyoxyethylenes for cement fluidity , PPG introduced after they played an antifoaming function , MAA seeking alternatives were investigated. The comparison among the aphthalene superplasticizer, polycarboxylic superplasticize with two-steps synthesis and a series of comparative products at home and abroad was made through concrete experiment. Then, some concluding analysis from experimental data was made. Finally,the paper was summarized, and some prospects of future research directions to two-step synthesis of polycarboxylic superplasticizer was proposed.
Keywords: two-step synthesis; polycarboxylic; superplasticizer; MPEG; cement fluidity