Patent ID: 9175122
Filing Date: 2015-11-03
Classification: C04B,C08F

Abstract:
1. A preparation method of hyperbranched polycarboxylic acid containing copolymer cement dispersant, characterized in that Monomer A, B and C undergo the free radical copolymerization in the aqueous medium, wherein the molar ratio of Monomer A, Monomer B and Monomer C shall conform to: B/A=2˜10, C/(A+B+C)=0.02˜0.08, where Monomer A is expressed by General Formula (1): Where, R 1 is hydrogen atom or methyl; X 1 O, CH 2 O, CH 2 CH 2 O; m is the average addition mole number of epoxy ethane, which is an integer from 5 to 200. Monomer B is expressed by General Formula (2): Where, R 2 represents H or COOM; R 3 represents H or CH 3 ; M represents H, Na, K or NH 4 ; Monomer C is expressed by General Formula (3): Where, R 4 is hydrogen atom or methyl; X 2 ═O, CH 2 O, CH 2 CH 2 O; Y═CH 2 , CH 2 CH 2 , CH(CH 3 ), CH 2 CH 2 CH 2 , CH(CH 3 )CH 2 , C(CH 3 ) 2 ; n is the average addition mole number of epoxy ethane, which is an integer from 5 to 200.