LONG-ACTING SUSTAINED-RELEASE POLYCARBOXYLIC ACID SET-RETARDING AGENT AND PREPARATION METHOD THEREFOR

摘要

Disclosed are a long-acting sustained-release polycarboxylic acid set-retarding agent and a preparation method therefor, the method comprising the following steps: (1) esterification: reacting methacrylic acid, saturated acid and 3-bis (2-hydroxyethyl) amino-2-hydroxypropanesulfonic acid under the action of a catalyst to obtain unsaturated esterified small monomers; (2) putting cumenyl polyoxyethylene ether, unsaturated monocarboxylic acid, diethyl 3-butenylphosphonate, etc. in a substrate material, and then, separately dropping a photoinitiator (a first solution), a chain transfer agent, an unsaturated monocarboxylic acid, an unsaturated esterified small monomer, and an unsaturated carboxylate (a second solution) dissolved in deionized water to the substrate material for reaction and polymerization; and (3) after the heat preservation is completed, adding a pH adjusting solution for neutralization to obtain the product. The set-retarding agent prepared by the present invention has a good slump constant retention capability over a long period of time.