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Preparation method for anti-mud-type polycarboxylic-acid water-reducing agent and application thereof

A technology of polycarboxylic acid and water-reducing agent, which is applied in the field of preparation of clay-resistant polycarboxylate water-reducing agent, can solve the problem of side chain entering into clay frame structure, poor clay resistance, poor plasticity retention over time, and mixing of water-reducing agent with water-reducing agent. To solve the problems of large amount, etc., to achieve the effect of shortening the synthesis time, high water reduction rate, and weakening the interspersed effect

Active Publication Date: 2015-08-26
GUANGZHOU INSTITUTE OF BUILDING SCIENCE CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its molecule is in a comb-like structure, and the side chains are easy to enter the clay framework structure, resulting in an excessive amount of superplasticizer
[0006] However, the preparation of mud-resistant polycarboxylate superplasticizers in the prior art requires different degrees of temperature. The synthesis time is long, heating is required, and energy is consumed. The prepared mud-resistant polycarboxylate superplasticizers have good mud resistance and Poor plasticity over time

Method used

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  • Preparation method for anti-mud-type polycarboxylic-acid water-reducing agent and application thereof
  • Preparation method for anti-mud-type polycarboxylic-acid water-reducing agent and application thereof

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preparation example Construction

[0029] The invention provides a preparation method of mud-resistant polycarboxylate superplasticizer, comprising:

[0030] Material preparation, butenol polyoxyethylene ether, acrylic acid, p-styrene formate, maleic anhydride-β-cyclodextrin, mercaptopropionic acid, ascorbic acid, sodium dithionite, and hydrogen peroxide in a mass ratio of 100- 130: 15-25: 1-5: 5-15: 0.1-10.0: 0.3-1.2: 0.1-1.0: 0.5-5.0;

[0031] Under normal temperature conditions of 5-35°C, mix and dissolve isobutylene alcohol polyoxyethylene ether and maleic anhydride-β-cyclodextrin in water to obtain an aqueous monomer solution with a mass concentration of (50-70)%;

[0032] Mixing acrylic acid and p-styrene methacrylate to form an aqueous solution with a mass concentration of (80-95)% to obtain a mixed solution of acrylic acid and p-styrene methacrylate;

[0033] Adding (5-15)% of the mixed solution of acrylic acid and p-styrene formate to the aqueous monomer solution;

[0034] Add (27-50)% hydrogen perox...

Embodiment 1

[0043]Mix 18.0 g of acrylic acid with 4.0 g of p-styrene methacrylate, and add deionized water to prepare solution A with a concentration of 80%.

[0044] 0.7 g of ascorbic acid was mixed with 1.0 g of mercaptopropionic acid, and deionized water was added to prepare solution B with a concentration of 5%.

[0045] Mix 3.0 g of sodium dithionite with 7.0 g of deionized water to prepare solution C with a concentration of 30%.

[0046] At room temperature of 20°C, 120.0g of isobutenol polyoxyethylene ether with a molecular weight of 2400 and 7.0g of maleic anhydride-β-cyclodextrin were added to the reactor, and then 98.0g of deionized water was added to prepare a monomer mass concentration of 56% macromonomer solution, then add 3.0g solution A, after stirring evenly, add 3.0g 27.5% hydrogen peroxide solution. After the above mixture was stirred for 10 minutes, solution B, the remaining solution A and solution C were added dropwise under nitrogen protection, and the addition was c...

Embodiment 2

[0048] 21.0 g of acrylic acid was mixed with 2.5 g of p-styrene methacrylate, and deionized water was added to prepare solution A with a concentration of 85%.

[0049] Mix 0.5 g of ascorbic acid and 0.5 g of mercaptopropionic acid, and add deionized water to prepare solution B with a concentration of 2.5%.

[0050] Mix 1.5 g of sodium dithionite with deionized water to prepare solution C with a concentration of 35%.

[0051] At room temperature at 5°C, add 130.0 g of isobutenol polyoxyethylene ether with a molecular weight of 2400 and 5.5 g of maleic anhydride-β-cyclodextrin into the reactor, and then add 60.0 g of deionized water to prepare a monomer mass concentration of 69% macromonomer solution, then add 2.0g solution A, after stirring evenly, add 1.5g 27.5% hydrogen peroxide solution. After the above mixture was stirred for 10 minutes, solution B, the remaining solution A and solution C were added dropwise under nitrogen protection, and the addition was controlled within...

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Abstract

The invention discloses a preparation method for an anti-mud-type polycarboxylic-acid water-reducing agent and application thereof. The method is used to improve production efficiency of the anti-mud-type polycarboxylic-acid water-reducing agent, save energy and reinforce anti-mud performance and gradual plasticity-maintaining property of the anti-mud-type polycarboxylic-acid water-reducing agent. The preparation method for the anti-mud-type polycarboxylic-acid water-reducing agent provided by the invention comprises the following steps: under the normal temperature condition of 5 to 35 DEG C, mixing isobutylene alcohol polyoxyethylene ether and maleic anhydride-beta-cyclodextrin and then dissolving the mixture in water; adding a mixed solution of acrylic acid and p-styryl formate; adding hydrogen peroxide; under the protection of nitrogen, adding a mixed solution of mercaptopropionic acid and ascorbic acid, a mixed solution of acylic acid and p-styryl formate, and sodium dithionite; and adding an aqueous sodium hydroxide solution and adjusting the pH value to 6 to 7 so as to obtain the anti-mud-type polycarboxylic-acid water-reducing agent. The anti-mud-type polycarboxylic-acid water-reducing agent provided by the invention has a cup-shaped structure.

Description

technical field [0001] The invention relates to the field of concrete water reducers for building materials, in particular to a preparation method and application of a mud-resistant polycarboxylate water reducer. Background technique [0002] Anti-mud polycarboxylate superplasticizer is a new generation of water reducer proposed in the 1980s by polymerization of unsaturated monomers containing carboxyl groups and other monomers. High efficiency, adjustable function, green environmental protection, etc., have been widely used in the low-grade ready-mixed concrete industry, but the mud-resistant polycarboxylate superplasticizer has a negative effect on the clay mineral components of the aggregate during the application of low-grade concrete Especially sensitive. With the explosive growth of concrete construction in recent years, the resources of high-quality sand and gravel aggregates have decreased sharply, and the clay content of aggregates has continued to increase. With t...

Claims

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Application Information

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IPC IPC(8): C08F291/06C08F220/06C08F212/14C08F4/40C04B24/28C04B103/30
Inventor 孙申美邵强徐海军钟开红
Owner GUANGZHOU INSTITUTE OF BUILDING SCIENCE CO LTD
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