| 摘要 |
A slump retaining polycarboxylic acid superplasticizer. A weight average molecular weight of the superplasticizer is 20,000-80,000. The slump retaining polycarboxylic acid superplasticizer is prepared by performing polymerization reaction on a monomer A, a monomer B, a monomer C and a monomer D in an aqueous solution in the presence of a redox initiator, wherein a molar ratio of (the monomer A+the monomer B):the monomer C:the monomer D is 1:(3-8):(4-12), and a molar ratio of the monomer A to the monomer B is 1:(1-4). |
| 主权项 |
1. The slump-retaining type polycarboxylate superplasticizer, characterized with weight-average molecular weight of 20,000 to 80,000, which is obtained through polymerization reaction of monomer A, monomer B, monomer C and monomer D in aqueous solution with the existence of redox initiator, the molar ratio, (monomer A+monomer B):monomer C:monomer D, is 1:3˜8:4˜12, wherein, molar ration of monomer A and monomer B is 1:1˜4, and the said monomer A is represented by general formula (1): Wherein, R1 represents H or CH3; X represents O, CH2O or CH2CH2O; p represents integer between 110 and 350; and the said monomer B is represented by general formula (2): Wherein, R2 represents H or CH3; R3 represents alkyl having carbon number of 1˜4; n represents integer between 20 and 90; and the said monomer C is represented by general formula (3): Wherein, R4 represents H or CH3; M represents hydrogen atom, alkali metal ion, alkaline earth metal ion, ammonium ion or organic amine group; and the said monomer D is represented by general formula (4): In general formula (4), R5 represents H or CH3; x=0 or 1, y=0 or 1, and x and y don't equal to 0 or 1 simultaneously. |
