Unsaturated phosphate ester for producing high-slump-retaining type polycarboxylic acid water reducing agent

Abstract

The invention relates to unsaturated phosphate ester for producing a high-slump-retaining type polycarboxylic acid water reducing agent. The unsaturated phosphate ester is prepared through the following steps of firstly, performing an esterification reaction on one or a mixture of one or more of the unsaturated acid and the unsaturated acid anhydride, and alcohol; then performing a phosphorylation reaction on the prepared unsaturated acid ester and a bonderite so as to obtain unsaturated phosphate ester; and finally performing a radical polymerization reaction on the prepared phosphate ester, and methyl-2-propen-1-ol or one or a mixture of one or more of TPEG, a chain-transfer agent, unsaturated acid and an unsaturated acid derivative at the room temperature so as to obtain the phosphoric acid base high-slump-retaining type polycarboxylic acid high-performance water reducing agent. The unsaturated phosphate ester disclosed by the invention can be used for synthesizing the water reducing agent, so that the water reducing agent is excellent in properties, and has the advantages of being low in mixing quantity, high in water reducing rate, excellent in slump-retaining capacity, good in adaptability to cement, insensitive to mud content of concrete materials and the like.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures in building materials, in particular to an unsaturated phosphate used for producing high-slump polycarboxylate water reducers. Background technique [0002] Concrete is the most widely used building material in modern times. Concrete admixture is the key material for the development of concrete to the high-tech field, and water reducer is the most widely used concrete admixture. Adding water reducing agent into concrete can improve the workability of concrete, increase the strength of concrete, and save cement under the same water consumption. [0003] Polycarboxylate-based water reducer is the third generation of high-performance water reducer developed after ordinary water reducers represented by wood calcium and wood magnesium and high-efficiency water reducers represented by naphthalene and melamine. It has the advantages of low dosage, high water reducing rate, low shrinkage of ...

AI Technical Summary

Problems solved by technology

This technology discloses a kind of unsaturated phosphoric acid ester, and unsaturated phosphoric acid ester participates in synthesizing polycarboxylate water reducer, but the unsaturated phosphoric acid ester in this application is propenyl phosphite or acrylate hydroxypropyl phosphate, this There are few free carboxyl groups in the two kinds of phosphates participating in the polymerization reaction, and the effect of applying water reducing agent is not good.

[0008] CN104261719A discloses a polycarboxylate water reducer, and discloses its general structural formula, which is composed of three parts, unsaturated carboxylic acid monomer, unsaturated phosphoric acid ester monomer and polyether macromonomer. There are no carboxyl groups on the two carbon atoms of the disclosed unsaturated phosphate monomer, and the content of carboxyl groups in the water reducing agent is relatively low, and its slump retention ability in cement cannot achieve the best effect

[0011] Among them, R represents an alkyl group with 1 to 2 carbon atoms, and X represents an alkyl or alkoxy group with 2 to 6 carbon atoms. This structure participates in the synthesis of water reducers and has a certain effect on the slump retention ability of concrete, but the effect There is still room for improvement

Images