Polycarboxylic acid water reducer and synthesis method thereof

Abstract

The invention discloses a synthesis method of a polycarboxylic acid water reducer. The synthesis method comprises the following steps: S1, preparing raw materials; S2, preparing each raw material intoa solution with a corresponding concentration; S3, uniformly mixing a TPEG dissolved solution, a sodium methylallyl sulfonate dissolved solution, an ammonium persulfate dissolved solution, a polyethylene allyl propionate macro-monomer dissolved solution and a thioglycolic acid dissolved solution according to the following volume ratio: 4 to 5 parts of the TPEG dissolved solution, 1 to 2 parts ofthe sodium methylallyl sulfonate dissolved solution, 1 to 2 parts of the ammonium persulfate dissolved solution and 2 to 4 parts of the polyethylene allyl propionate macro-monomer dissolved solution;then uniformly stirring and raising the temperature to 70 to 75 DEG C; then dropwise adding an acrylic acid solution and a hydrogen peroxide solution into a mixed solution, and finishing dropwise adding within 3 to 4h; S4, dropwise adding the thioglycolic acid dissolved solution into the solution of S3, wherein the dropwise adding amount is 0.05 to 0.1 percent of the total solution volume in S3, and finishing dropwise adding within 3 to 4h; then reacting at 70 to 75 DEG C for 3 to 5h. The invention further discloses the polycarboxylic acid water reducer prepared by adopting the synthesis method.

Description

technical field [0001] The invention relates to a polycarboxylate water reducer, in particular to a polycarboxylate water reducer and a synthesis method thereof. Background technique [0002] Polycarboxylate Superplasticizer (Polycarboxylate Superplasticizer) is a high-performance water-reducing agent and a cement dispersant in the application of cement concrete. Widely used in highways, bridges, dams, tunnels, high-rise buildings and other projects. [0003] In many concrete projects, traditional high-efficiency concrete such as naphthalene series is increasingly unable to meet engineering needs due to limitations in technical performance. A new generation of water reducer that has attracted much attention at home and abroad, polycarboxylate high-performance water reducer, because it has truly designed an effective molecular structure based on the mechanism of dispersed cement, has a super-dispersion type, and can prevent concrete slump loss. It does not cause obvious ret...

AI Technical Summary

Problems solved by technology

[0004] However, at present, polycarboxylate superplasticizers have problems such as insufficient slump retention, strong temperature sensitivity, and high viscosity in high-temperature environments, which seriously affect construction and engineering quality.