A method for preparing a
macro-
monomer synthesized polycarboxylate
water reducer through alcoholysis of alkenyl-
acyl chloride belongs to the field of water reducers. The method comprises the following steps: firstly polymerizing a cationic chain, and then reacting with the alkenyl-
acyl chloride, thus obtaining a
macro-
monomer; then carrying out copolymerization on the
macro-
monomer and a
carboxylic acid micro-monomer, i.e., polymerizing under an oxidization-reduction initiating
system formed by high-valence cerate and alcohols by taking an unsaturated cationic
quaternary ammonium salt monomer as a reactant, thus obtaining a terminal hydroxyl cationic
long chain; then respectively enabling the terminal hydroxyl cationic
long chain and
polyethylene glycol monomothyl
ether to react with the alkenyl-
acyl chloride respectively, thus preparing macro-monomers with different structures; then carrying out free
radical polymerization on the macro-monomers and unsaturated
carboxylic acid micro-monomers, thus obtaining the macro-monomer composite polycarboxylate
water reducer. According to the method disclosed by the invention, the macro-monomers with different structures and functions are successfully synthesized through ways of polymerizing the cationic chain and respectively reacting with the alkenyl-acyl
chloride by combining polyether, and a novel comb-structure polycarboxylate
water reducer which takes a polycarboxyl acid as a main chain and the cationic
long chain and the polyether as polybasic side chains can be finally obtained. A reaction technology is simple and easy, and multiple excellent effects of retaining
slump through reducing water, resisting clay, and the like are realized.