| abstract |
The present application relates to the field of water reducing agents, and specifically discloses a polycarboxylate water reducing agent and a preparation method thereof. The structural formula of a polycarboxylate water-reducing agent includes structural units represented by formula (i) and formula (ii): R 1 and R 2 are independently selected from hydrogen, C1-C6 alkyl groups, A 1 and A 2 are each independently independently selected from divalent C1-C6 alkyl, B 1 and B 2 are each independently selected from divalent C4-C6 alkyl, m 1 and m 2 are each independently selected from 0, 1, n 1 and n 2 are independently selected from 0, 1, 20≤p 1 ≤80, 20≤p 2 ≤80, 0≤q 1 ≤10, 0≤q 2 ≤10; R 3 is selected from hydrogen, C1-C6 alkyl, Carboxymethyl, R 4 is selected from hydrogen, C1-C6 alkyl group, carboxyl group, when R 4 is a carboxyl group, R 4 can bond with the carboxyl group in formula (ii) to form an acid anhydride group. The present application improves the dispersion performance of the polycarboxylate water reducing agent. |