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Using water separation technique,acrylic acid (AA) and polyethylene glycol (PEG) 1000,of which the ratio was 1.5,were esterified and the optimum esterification ratio of 90% could be reached under the condition of 110 ℃×3 h.Using polyoxyethylene acrylate macro-monomer (PA) prepared in the esterification,AA and sodium methylacryl sulfonate (MAS) as monomers,a copolymer which could be used as superplasticizer was prepared by free radical co-polymerization in n(PA):n(AA):n(MAS) of 1:7:3.When the synthesis condition was 80 ℃× 5 h,the optimal dosage of initiator was 3.0%-4.0%,the fluidity of cement paste with the samples could reach 270 mm.By analyzing the effect of the content of residual small molecule sulfonic monomer on the properties of sample,n(MAS)/n(PA) was controlled in a range of 2.5-3.8.
Using water separation technique, acrylic acid (AA) and polyethylene glycol (PEG) 1000, of which the ratio was 1.5, were esterified and the optimum esterification ratio of 90% could be reached under the condition of 110 ℃ × 3 h. Using polyoxyethylene acrylate macro-monomer (PA) prepared in the esterification, AA and sodium methylacryl sulfonate (MAS) as monomers, a copolymer which could be used as superplasticizer was prepared by free radical co-polymerization in n (AA) n MAS: 1: 7: 3.When the synthesis condition was 80 ℃ × 5 h, the optimal dosage of initiator was 3.0% -4.0%, the fluidity of cement paste with the samples could reach 270 mm. effect of the content of residual small molecule sulfonic monomer on the properties of sample, n (MAS) / n (PA) was controlled in a range of 2.5-3.8.