Triblock polycarboxylic acid water reducing agent and preparation method thereof

A polycarboxylic acid and triblock technology, applied in the field of preparation of triblock polycarboxylate water reducing agent, can solve the problems of poor sulfate resistance, small slump loss, fast slump loss and the like

Active Publication Date: 2017-11-10
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The present invention aims to overcome the problems of insufficient water reducing effect, rapid slump loss, poor cement adaptability, poor sulfate tolerance and high slurry viscosity of existing polycarboxylate water reducers, and provides a triblock polycarboxylate high The preparation method of performance water reducing agent, the products produced have the advantages of low dosage, high water reducing rate, small slump loss, strong adaptability, high sulfate tolerance, low slurry viscosity, etc., and the preparation process is simple, low production cost

Method used

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  • Triblock polycarboxylic acid water reducing agent and preparation method thereof
  • Triblock polycarboxylic acid water reducing agent and preparation method thereof
  • Triblock polycarboxylic acid water reducing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] 15g polyethylene glycol monomethyl ether methacrylate (Mn=500g / mol), 0.17g S, S'-p-(α,α'-dimethyl-α"-acetic acid) trithiocarbonate and After 0.02g of azobisisobutylamidine hydrochloride and 35g of 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 60°C, the reaction time is 10h, the conversion rate of monomer X is 97.07%, and the unreacted monomer and small molecules are removed by dialysis to obtain the polyether Macromonomer-RAFT reagent (Mw=12.14kDa), add 2.05g acrylic acid (45.83% conversion rate), 0.24g sodium methacrylate (43.19% conversion rate) and continue polymerization for 12h to obtain triblock polycarboxylic acid Aqueous mother liquor (Mw=13.47kDa).

Embodiment 2

[0068] Mix 15g polyethylene glycol monomethyl ether acrylate (Mn=500g / mol), 0.11g S, S'-p-(α,α'-dimethyl-α"-acetic acid) trithiocarbonate with 0.01g After azobisisobutylamidine hydrochloride and 35g water are fully mixed, pass into N 2 O in the solution 2 discharge, the N 2 The reversible addition-fragmentation chain transfer polymerization reaction was carried out under protection, the reaction temperature was 80°C, the reaction time was 4h, the conversion rate of monomer X was 97.34%, and the unreacted monomer and small molecules were removed by dialysis to obtain the polyether macro Monomer-RAFT reagent (Mw=19.43kDa), add 4.64g methacrylic acid (47.84% conversion rate), 0.86g sodium propylene sulfonate (47.69% conversion rate) and continue polymerization for 5h to obtain triblock polycarboxylic acid dehydrated Agent stock solution (Mw=25.87kDa).

Embodiment 3

[0070] 28.5g polyethylene glycol monomethyl ether methacrylate (Mn=950g / mol), 0.32g S, S'-p-(α,α'-dimethyl-α"-acetic acid) trithiocarbonate After fully mixing with 0.03g 4,4'-azobis(4-cyanovaleric acid) and 66.5g water, pass N 2 O in the solution 2 discharge, the N 2 The reversible addition-fragmentation chain transfer polymerization reaction was carried out under protection, the reaction temperature was 70°C, the reaction time was 8 hours, the conversion rate of monomer X was 97.62%, and the unreacted monomer and small molecules were removed by dialysis to obtain polyether macro Monomer-RAFT reagent (Mw=12.48kDa), add 3.89g acrylic acid (48.56% conversion rate), 0.94g sodium methacrylate (47.04% conversion rate) and continue to polymerize for 5h to obtain three-block polycarboxylic acid dehydrated Agent stock solution (Mw=14.26kDa).

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Abstract

The invention discloses a triblock polycarboxylic acid water reducing agent. The tail ends of the blocks of the two ends of the triblock polycarboxylic acid water reducing agent are adsorption groups, and the middle block is a long side chain, wherein the adsorption groups at the tail ends comprise carboxylic acid groups and sulfonic acid groups. The triblock polycarboxylic acid water reducing agent has the advantages of low admixing amount, high water reducing rate, low slump loss, high adaptability, high sulfate tolerance, low slurry viscosity and the like. According to the invention, the sequential structure distribution of polycarboxylic acid is regulated and controlled to regulate the conformation of the polycarboxylic acid in a solution, so that the adsorption process is changed, thereby changing the macroscopic performance. A synthesis method disclosed by the invention is simple and low in production cost, and has low process requirements.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures in building materials, in particular to a preparation method of a tri-block polycarboxylate water reducer that can be used as a concrete water reducer. Background technique [0002] As a new generation of high-performance water reducer, polycarboxylate water reducer is also known as superplasticizer. Due to its wide source of copolymer raw materials, molecular composition can be designed, it has low dosage, good slump performance, molecular structure With outstanding advantages such as strong adjustability and clean production process, it is widely used to disperse cement particles in concrete and mortar. [0003] The excellent performance of polycarboxylic acid comes from its structure, and its comb structure is composed of anionic polyelectrolyte backbone and nonionic polyethylene glycol (PEG) side chains. The negatively charged carboxyl groups on the main chain of polycarboxylic ac...

Claims

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Application Information

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IPC IPC(8): C08F293/00C08F220/06C08F228/02C08F220/58C08F2/38C04B24/16C04B103/30
CPCC04B24/165C04B2103/0061C04B2103/302C08F2/38C08F220/06C08F220/58C08F220/585C08F228/02C08F293/005C08F2438/03
Inventor 王秀梅赵红霞王衍伟舒鑫杨勇冉千平
Owner JIANGSU SOBUTE NEW MATERIALS
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