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

A polycarboxylic acid-based, unsaturated technology, applied in the direction of phosphorus organic compounds, chemical instruments and methods, compounds of Group 5/15 elements of the periodic table, etc., can solve the problems of low carboxyl content, poor effect of water reducing The slump ability can not achieve the best effect, etc., to achieve the effect of delaying the hydration process, good adaptability, and insensitivity to mud content

Active Publication Date: 2016-10-12
GUANGDONG FUTE NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0055] Prepare unsaturated phosphoric acid ester according to following raw material amount and process, specifically:

[0056] (1) Esterification reaction: To ensure that there is no residual water in the reaction kettle, first pass nitrogen into the kettle for 5 minutes, add 15 g of ethylene glycol, and then put 23.7 g of maleic anhydride into the bottom of the kettle, seal the mouth of the kettle, open and stir, and the temperature After keeping at 55°C for 1 hour, turn on the condensed water to lower the temperature, add 9.7 g of deionized water, stir for 5 minutes, and beat the material, turn off the nitrogen and circulating water to obtain ethylene glycol maleate;

[0057] (2) Phosphorylation reaction: Slowly add 42.3 g of the prepared ethylene glycol maleate into the reaction kettle, stir with the stirrer at low speed, and control the temperature of the water bath at 40°C; Add a total of 15g of phosphorus pentoxide in 4 batches, and each addition needs an interval of 15...

Embodiment 2

[0062] Prepare phosphoric acid-based high-slump polycarboxylate-based high-performance water-reducers according to the following raw material quantities and processes, specifically:

[0063] (1) Esterification reaction: To ensure that there is no residual water in the reaction kettle, first pass nitrogen into the kettle for 5 minutes, add 18g of ethylene glycol, and then put 39g of itaconic anhydride into the bottom of the kettle, seal the mouth of the kettle, open and stir, and keep the temperature After keeping at 60°C for 2 hours, turn on the condensed water to lower the temperature, add 10.1 g of deionized water, stir for 5 minutes, then beat the material, turn off the nitrogen, and circulate water to obtain ethylene glycol itaconate.

[0064] (2) Phosphorylation reaction: slowly add 28.8 g of the prepared ethylene glycol itaconate into the reaction kettle, stir with a stirrer at a low speed, and control the temperature of the water bath at 43°C. After the reactants are ke...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/09C08F283/06C08F220/06C08F230/02C08F222/02C08F220/56C04B24/26C04B103/30
CPCC04B24/243C04B2103/302C07F9/091C08F283/065C08F220/06C08F230/02C08F222/02C08F220/56
Inventor 林震张炜梁晓彤黎锦霞
Owner GUANGDONG FUTE NEW MATERIALS TECH CO LTD
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