Slow-release polycarboxylate superplasticizer and preparation method thereof

A slow-release polycarboxylate and superplasticizer technology, which is applied in the field of polycarboxylate superplasticizers for cement concrete, can solve the problems of no esterification reaction, low conversion rate of high-performance superplasticizers, and difficulty in process control Large and other problems, to achieve the effects of weakening interspersed adsorption, improving sensitivity, and improving dispersion retention performance

Active Publication Date: 2017-10-24
JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water reducing and slump retention properties of the water reducing agent are good, but it is difficult to ensure that there is no esterification reaction by using unsaturated acid anhydride and monohydric alcohol amine for acylation reaction, and the preparation process is relatively complicated, and the process control is difficult. The conversion rate of the prepared amide / imide type polycarboxylate high-performance water reducer is low

Method used

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  • Slow-release polycarboxylate superplasticizer and preparation method thereof
  • Slow-release polycarboxylate superplasticizer and preparation method thereof
  • Slow-release polycarboxylate superplasticizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Partially react 1 mol of acrylic acid with 0.6 mol of diphenylphosphoryl chloride to obtain unsaturated small monomers containing phosphate groups, and then add 0.6 mol of phenylethylamine to the above reaction system to react with phosphate groups to obtain amide group-containing unsaturated monomers. Unsaturated small monomer, and then with 5mol methallyl polyoxyethylene ether, under the action of 0.01mol sodium persulfate, 0.03mol sodium metabisulfite and 0.01mol sodium methacrylsulfonate, keep at 50 ℃ for free radical Polymerize for 3 hours to obtain a copolymer product, adjust the pH value of the copolymer product to 6.5 with sodium hydroxide, and add water to obtain a polycarboxylate water reducer with a mass concentration of 40%.

Embodiment 2

[0038] Partially react 1 mol of methacrylic acid with 0.8 mol of diphenylphosphoryl chloride to obtain unsaturated small monomers containing phosphate groups, and then add 0.8 mol of aniline to the above reaction system to react with phosphate groups to obtain amide group-containing unsaturated monomers. Small unsaturated monomers, and 1.2 mol isoprenyl polyoxyethylene ether, under the action of 0.02 mol potassium persulfate, 0.1 mol sodium sulfite and 0.02 mol mercaptopropanol, kept at 25 ° C for 5 hours to obtain For the copolymerization product, adjust the pH value of the copolymerization product to 6.0 with calcium hydroxide, and add water to obtain a polycarboxylate water reducer with a mass concentration of 15%.

Embodiment 3

[0040]Partially react 1mol maleic acid with 0.2mol diphenylphosphoryl chloride to obtain unsaturated small monomers containing phosphate groups, then add 0.2mol phenethylamine to the above reaction system to react with phosphate groups to obtain amide group-containing group of unsaturated small monomers, and then with 8mol methallyl polyoxyethylene propylene ether under the action of 0.05mol hydrogen peroxide, 0.2mol ferrous pyrophosphate and 0.05mol mercaptoacetic acid, keep at 30 ℃ for free radical The copolymerization product was obtained after the polymerization reaction for 4 hours, and the pH value of the copolymerization product was adjusted to 7 with sodium hydroxide, and water was added to obtain a polycarboxylic acid-based water reducer with a mass concentration of 50%.

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Abstract

The invention discloses a slow-release polycarboxylate superplasticizer and a preparation method thereof. The preparation method comprises specific steps as follows: firstly, small unsaturated carboxylic acid monomers and diphenylphosphinyl chloride are subjected to a partial reaction, and small unsaturated monomers containing phosphate ester groups are obtained; then 2-phenylethylamine and phosphate ester groups are added to a reaction system and subjected to a reaction, and small unsaturated monomers containing amide groups are obtained; the small unsaturated monomers containing the amide groups are subjected to an oxidation-reduction free radical polymerization reaction with unsaturated polyether macromonomers under the action of an initiating agent, a reducing agent and a chain transfer agent, and a copolymerization product is obtained; pH value is adjusted to 6-7 after the reaction, water is added, and the polycarboxylate superplasticizer is obtained. The amide groups containing benzene rings are introduced to side chains of the prepared polycarboxylate superplasticizer, so that the dispersibility of the polycarboxylate superplasticizer for cement is improved, the polycarboxylate superplasticizer has good slump retaining performance on the premise of water reduction, and besides, the yield of the polycarboxylate superplasticizer containing the amide groups can reach 94% or higher.

Description

technical field [0001] The invention relates to the technical field of a polycarboxylate water reducer for cement concrete, in particular to a preparation method of a slow-release polycarboxylate water reducer. Background technique [0002] Polycarboxylate water reducer, as a new type of high-performance water reducer following the aliphatic, naphthalene and sulfamate-based water reducers, because of its low dosage, high water-reducing rate, and adjustable molecular structure Excellent properties such as strong tonality and environmental protection have been more and more widely used in a series of concrete projects such as high-speed railways, bridges, tunnels, and dams. The quality of concrete sand and gravel is getting worse (high mud content and stone powder content), etc., polycarboxylate superplasticizers often have some problems in practical applications, and the excessive loss of slump over time is the most common one. main problem. Especially when transporting for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/54C04B24/26C04B103/30
CPCC04B24/2605C04B2103/302C08F283/065C08F220/06C08F220/54
Inventor 钱珊珊李梦婷姜海东黄春满郑春扬郭兆来
Owner JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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