| abstract |
The invention provides a comb-type polycarboxylate dispersant containing polyether side chains and a preparation method thereof. The dispersant is formed by mixing components in the following mass ratios: 4-50 parts of allyl polyoxyethylene ether 1-10 parts of acrylic acid homologues and 1-10 parts of acrylates. The method includes: (1), adding a certain amount of chain transfer agent, water and methanol into the reaction vessel, stirring, and heating to above 90°C; (2), using a constant flow pump to drop allyl polystyrene into the reaction vessel The mixed solution of oxyethylene ether, acrylic acid homologue, acrylate and a certain amount of methanol; use another constant flow pump to drip the initiator aqueous solution in the reaction bottle; the total control dropping time is 1-2 hours, after the drop Keep warm for 2-3h; (3) Cool to room temperature, neutralize with alkali solution to pH 7-8, then raise the temperature to above 110°C to distill methanol. |