The invention discloses a preparation method of a star-shaped
alcohol amine ester polycarboxylic acid
cement grinding aid, which comprises the following steps: adding an unsaturated
alcohol amine esterification product prepared by the invention, 15-30% of unsaturated acid
monomer and water into a reaction kettle, heating to 60-80 DEG C, stirring for 15-30 minutes, cooling to
room temperature, adding unsaturated polyether
monomer and an initiator into the reaction kettle, adding water to adjust the
system concentration to 50-70%, and stirring for 15-30 minutes to obtain the star-shaped
alcohol amine ester polycarboxylic acid
cement grinding aid. The
reaction temperature is kept at 20-60 DEG C, a dropwise adding material A composed of the residual unsaturated acid
monomer aqueous solution and a dropwise adding material B composed of a
chain transfer agent and a
reducing agent aqueous solution are dropwise added at the same time, the dropwise adding time is 2-4 h, then heat preservation is conducted for 1-2 h at the temperature of 50-60 DEG C, polyhydric alcohol amine is added to adjust the pH value to be 6-7, water is added, and the star-shaped alcohol amine ester polycarboxylic acid
cement grinding aid with the concentration of 30-60 wt% is obtained; the star-shaped structure contains various required functional groups, and the obtained product can be directly used without compounding, not only has the effects of grinding aiding and enhancing, but also solves the problems of poor adaptability with a concrete admixture and reduced
slurry fluidity after being doped with a
cement grinding aid.