High-performance polycarboxylic acid water reducing agent and preparation method thereof

Abstract

The invention discloses a preparation method of a high-performance polycarboxylic acid water reducing agent. The preparation method of the high-performance polycarboxylic acid water reducing agent comprises the following steps of: adding an unsaturated polyether macromonomer A and water into a reactor, uniformly stirring and dissolving, and then adding an initiator F hydrogen peroxide; then respectively dropwise adding unsaturated carboxylic acid or an unsaturated carboxylic acid anhydride small monomer B, an unsaturated carboxylate ester small monomer C, an aqueous solution of an initiator D, an aqueous solution of an initiator E and an aqueous solution of a molecular weight regulator, and carrying out reaction for 3-5 hours at the room temperature of 10-40 DEG C, so as to obtain a copolymerization product; carrying out a neutralization reaction, namely regulating the pH value of the copolymerization production to be 6-7 by adopting sodium hydroxide, so as to obtain the high-performance polycarboxylic acid water reducing agent. The invention also discloses a high-performance polycarboxylic acid water reducing agent prepared by adopting the preparation method. By controlling a material adding manner, two initiators are compounded, initiated and synthesized to form the high-performance polycarboxylic acid water reducing agent, the synthesized high-performance polycarboxylic acid water reducing agent is environmentally-friendly, pollution-free and high in reaction conversion ratio, and concrete doped with the high-performance polycarboxylic acid water reducing agent has better water reducing property, slump loss resistant property, dispersibility and workability.

Description

Technical field [0001] The present invention is a technical field of chemical building materials buildings, and especially involves a polycarboxylic acid high -performance water reduction agent and its preparation method. Background technique [0002] Polyether polycarboxylic acid water reduction agent has a high water reducing rate and collapse capacity, and its applications are becoming more and more extensive.In existing technologies, a variety of polycar carboxylic acid reduction agents with different molecular structures and performance characteristics appear, but there are not strong adaptability to certain cement, and concrete with high mud content and high stone powder content.Insufficient defects such as collapse performance. At the same time, due to high water reduction rate, water secretion is also prone to occur, especially in the concrete ratio of low and medium labels. [0003] The public number CN101530760A is publicly aggregated for 3 to 5 hours to synthesize a hi...

AI Technical Summary

Problems solved by technology

Its defect is: the heating temperature of this method is higher, and energy consumption is bigger, has increased production cost

Its disadvantages are: the water reducer synthesized by this method needs to be fed with nitrogen, the reaction temperature is high and not easy to control, it also increases the production cost, and the product has poor slump retention effect