Mud-resistant polycarboxylic acid water-reducing agent and preparation method thereof

A technology of polycarboxylic acid and water reducer, which is applied in the field of concrete admixture preparation, can solve the problems of reducing the dispersion and retention effect of traditional water reducers, and achieve the effects of inhibiting the adverse effects of soil, reducing adsorption, and inhibiting adverse effects

Active Publication Date: 2014-10-29
HAISO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a mud-resistant polycarboxylate water reducer that can effectively resist the adverse effects of soil and its preparation method for the problem that the soil in the concrete aggregate will reduce the dispersion and retention effect of the traditional water reducer

Method used

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  • Mud-resistant polycarboxylic acid water-reducing agent and preparation method thereof
  • Mud-resistant polycarboxylic acid water-reducing agent and preparation method thereof
  • Mud-resistant polycarboxylic acid water-reducing agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Add 99.0g water, 240.0g (0.1mol) methallyl polyoxyethylene ether (average molecular weight 2400), 13.6g 50 % (0.05mol) of allyltrimethylammonium chloride aqueous solution, stirred and heated to 80°C. An aqueous solution obtained by dissolving 30.2 g (0.42 mol) of acrylic acid and 2.3 g (0.02 mol) of hydroxyethyl acrylate in 8.1 g of water was added dropwise within 2 h. While adding the monomer solution of acrylic acid and hydroxyethyl acrylate dropwise, an aqueous solution obtained by dissolving 1.04 g of mercaptopropionic acid and 4.47 g of ammonium persulfate in 104.7 g of water was added dropwise over 2.5 h. After the dropwise addition, keep warm for 2 hours to complete the polymerization reaction, then cool the reaction mixture, neutralize it with 30wt% NaOH solution to make pH = 6, and add water to adjust the solid content to 40wt%, that is, the mud-resistant polycarboxylate water reducer HSPC- KN1.

Embodiment 2

[0044] Add 99.3g water, 240.0g (0.1mol) 3-methyl 3-butene-1-alcohol polyoxyethylene ether (average Molecular weight 2400), 12.5g of 50% (0.03mol) 2-(methacryloyloxy) ethyltrimethylammonium chloride aqueous solution, stirred and heated up to 60°C, added 1.38g of 30% H 2 o 2 solution. An aqueous solution obtained by dissolving 23.0 (0.32 mol) of acrylic acid and 6.5 g (0.05 mol) of hydroxypropyl acrylate in 7.4 g of water was added dropwise within 2.5 h. While adding the monomer solution of acrylic acid and hydroxypropyl acrylate dropwise, an aqueous solution obtained by dissolving 0.89 g of mercaptopropionic acid and 0.53 g of L-ascorbic acid in 27.0 g of water was added dropwise over 3 h. After the dropwise addition, keep warm for 1.5h to complete the polymerization reaction, then cool the reaction mixture, neutralize it with 40wt% NaOH solution to make the pH = 6, and add water to adjust the solid content to 40wt%, that is, the mud-resistant polycarboxylate superplasticizer...

Embodiment 3

[0046] Add 50.0g of water, 120.0g (0.1mol) of allyl polyoxyethylene ether (average molecular weight 1200), 4.1g of 50% (0.01 mol) of (3-acrylamidopropyl) trimethylammonium chloride aqueous solution, stirred and warmed up to 60°C, added 1.64g of 30% H 2 o 2 solution. An aqueous solution obtained by dissolving 14.4 g (0.20 mol) of acrylic acid and 13.0 g (0.10 mol) of hydroxyethyl methacrylate in 6.9 g of water was added dropwise within 0.5 h. While adding the monomer solution of acrylic acid and hydroxyethyl methacrylate dropwise, an aqueous solution obtained by dissolving 1.37 g of thioglycolic acid and 0.60 g of L-ascorbic acid in 37.4 g of water was added dropwise over 1 h. After the dropwise addition, keep warm for 3 hours to complete the polymerization reaction, then cool the reaction mixture, neutralize it with 40wt% NaOH solution to make pH = 7, and add water to adjust the solid content to 40wt%, that is, the mud-resistant polycarboxylate superplasticizer HSPC- KN3. ...

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Abstract

The invention discloses a mud-resistant polycarboxylic acid water-reducing agent and a preparation method thereof. The mud-resistant polycarboxylic acid water-reducing agent disclosed by the invention is prepared by copolymerizing an unsaturated polyalkylene dialcohol ether monomer a, an unsaturated carboxylic acid monomer b, unsaturated acid hydroxyalkyl ester c and an ammonium salt cationic unsaturated monomer d through free radicals under the action of an initiator and a chain transfer agent; and the mol ratio of the monomer a to the monomer b to the monomer c to the monomer d is 1.0:(2.0-4.2):(0.2-1.0):(0.1-0.5). Under the condition that aggregates contain mud, the dispersion effect of the mud-resistant polycarboxylic acid water-reducing agent disclosed by the invention is obviously prior to that of the traditional water-reducing agent; and the mud-resistant polycarboxylic acid water-reducing agent not only has low amount of admixture but also has better keeping property.

Description

technical field [0001] The invention relates to the field of preparation of concrete admixtures, in particular to a mud-resistant polycarboxylate water-reducer capable of effectively resisting adverse effects of soil and a preparation method thereof. Background technique [0002] High-performance concrete is generally composed of cement, coarse and fine aggregates, high-performance water reducer and water, among which high-performance water reducer and aggregate are essential raw materials. Polycarboxylate superplasticizer has become an important material for the manufacture of high-performance concrete because of its low dosage, high water-reducing rate, low concrete shrinkage, and environmental protection. It has been widely used in engineering. However, in the actual production process of concrete, it is found that the traditional polycarboxylate superplasticizer is very sensitive to the mud content in the aggregate. With the increase of mud content, the dispersion perfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F226/02C08F220/06C08F220/28C08F220/34C08F220/60C04B24/26C04B103/30
Inventor 赵帆詹洪王友奎杨灿李绵贵
Owner HAISO TECH
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