Preparation method of early-strength polycarboxylic acid water reducer

A technology of polycarboxylic acid and water reducer, which is applied in the field of concrete admixtures, can solve the problems of difficulty in obtaining synthetic monomer raw materials and low conversion rate in the polymerization process, and achieve small slump loss, simple synthesis method, and high water reducing rate. high effect

Active Publication Date: 2016-06-29
JIANGSU SOBUTE NEW MATERIALS +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to overcome the problems of the existing early-strength polycarboxylate water-reducer that its macromolecular synthetic monomer raw materials are difficult to obtain and the conversion rate of the polymerization process is low, and provides a preparation of an early-strength polycarboxylate water-reducer method, the produced product has the advantages of low dosage, high water reducing rate, strong cement adaptability, etc., and the preparation process is simple and the production cost is small

Method used

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  • Preparation method of early-strength polycarboxylic acid water reducer
  • Preparation method of early-strength polycarboxylic acid water reducer
  • Preparation method of early-strength polycarboxylic acid water reducer

Examples

Experimental program
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Effect test

Embodiment 1

[0043] 14.82g polyethylene glycol monomethyl ether acrylate (Mn=500g / mol), 0.68g 4-cyano-4-(phenylthioformylthio)valeric acid and 0.06g azobisisobutylamidine After the hydrochloride and 27.5g of water are fully mixed, N 2 O in the solution 2 discharge, the N 2 The reversible addition-fragmentation chain transfer polymerization reaction is carried out under protection, the reaction temperature is 60 ° C, the reaction time is 10 h, the conversion rate of monomer a is 98.55%, and the unreacted monomer and small molecules are removed by dialysis to obtain polyether macromolecules Body-RAFT reagent (Mw=7.91kDa),

[0044] Add 2.46g of acrylic acid (47.84% conversion rate) and 5.41g sodium methacrylate (45.35% conversion rate) to continue polymerization for 12 hours to obtain early-strength polycarboxylic acid mother liquor (Mw=8.68kDa).

Embodiment 2

[0046] 29.64g polyethylene glycol monomethyl ether acrylate (Mn=950g / mol), 0.28g 2-(phenylthioformylthio) propionic acid and 0.03g azobisisobutylamidine hydrochloride and 55g After the water is fully mixed, N 2 O in the solution 2 discharge, the N 2 The reversible addition-fragmentation chain transfer polymerization reaction is carried out under protection, the reaction temperature is 70 ° C, the reaction time is 6 hours, the conversion rate of monomer a is 97.34%, and the unreacted monomer and small molecules are removed by dialysis to obtain a large polyether monomer Body-RAFT reagent (Mw=43.09kDa),

[0047] Add 39.83g of acrylic acid (50.95% conversion rate) and 79.71g sodium propylene sulfonate (47.04% conversion rate) to continue polymerization for 10 hours to obtain early-strength polycarboxylic acid mother liquor (Mw=78.08kDa).

Embodiment 3

[0049] 29.64g of polyethylene glycol monomethyl ether methacrylate (Mn=950g / mol), 0.17g of 4-cyano-4-(phenylthioformylthio)valeric acid and 0.02g of 4,4'- Nitrogen bis(4-cyanovaleric acid) and 55g water are fully mixed, feed N 2 O in the solution 2 discharge, the N 2 The reversible addition-fragmentation chain transfer polymerization reaction is carried out under protection, the reaction temperature is 70°C, the reaction time is 8h, the conversion rate of monomer a is 97.62%, and the unreacted monomer and small molecules are removed by dialysis to obtain a large polyether monomer Body-RAFT reagent (Mw=31.14kDa),

[0050] Add 11.74g of methacrylic acid (49.65% conversion rate) and 28.3g 2-acrylamide-2-methylpropanesulfonic acid (47.84% conversion rate) to continue polymerization for 8h to obtain early strength polycarboxylic acid mother liquor (Mw=34.23kDa) .

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Abstract

The invention provides a preparation method of an early-strength polycarboxylic acid water reducer. The preparation method includes following steps: fully mixing monomer a with chain transfer agent, initiator and water; performing reversible addition-fragmentation chain transfer polymerization under protection of N2; enabling a product to be in polymerization reaction with monomer b and monomer c under protection of N2. The preparation method is simple in synthesis, low in process requirement and low in production cost. The early-strength polycarboxylic acid water reducer produced by the method has the advantages of low doping quantity, high water reducing efficiency and high cement adaptability, workability of concrete mixed by using the water reducer is high, and early strength of the water reducer can be improved remarkably.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures in building materials, in particular to a preparation method of an early-strength polycarboxylate water reducer that can be used for concrete. Background technique [0002] The wide application of concrete admixtures has made it an indispensable fifth component in concrete besides cement, sand, stone and water. The research and application of admixtures has promoted the development of new varieties of concrete and concrete construction technology. Among them, water reducing agent is the most widely used admixture in concrete engineering, and its usage has exceeded 80% of the total admixture, and it is an indispensable and important part of modern concrete. As a new type of high-performance water reducer, polycarboxylate superplasticizer is also called superplasticizer. Due to its wide source of copolymer raw materials and designable molecular composition, it has the advantages of low d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C08F220/06C08F228/02C08F220/58C08F212/14C08F2/38C04B24/16C04B103/30
Inventor 冉千平王秀梅杨勇刘金芝黄振张建纲翟树英
Owner JIANGSU SOBUTE NEW MATERIALS
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