A kind of anti-mud type polycarboxylate water reducer and preparation method thereof

A polycarboxylate-based, mud-resistant technology, applied in the field of polycarboxylate water-reducing agents for concrete, can solve the problems of reduced concrete water-reducing rate and slump-retaining performance, increased PCE water-reducing agent content, and prolonged concrete setting time and other problems, to achieve the effect of reducing surface adsorption, avoiding adverse effects, and easy control of reaction conditions

Active Publication Date: 2022-06-21
CHINA STATE CONSTRUCTION ENGINEERING CORPORATION +1
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AI Technical Summary

Problems solved by technology

However, polycarboxylate superplasticizers are highly sensitive to the mud content in sand and gravel, which is mainly manifested in the increase of the amount of PCE superplasticizer, resulting in a sharp decrease in concrete water reducing rate and slump retention performance, and a decrease in strength.
In the case of high aggregate mud content, simply increasing the amount of PCE can no longer effectively solve the problems of poor concrete fluidity and rapid loss. This is an important reason that has always restricted the further promotion and application of PCE in the ready-mixed concrete industry.
[0004] Although this phenomenon can be alleviated by increasing its dosage, this brings problems such as prolonged concrete setting time, reduced compressive strength ratio, and high cost.

Method used

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  • A kind of anti-mud type polycarboxylate water reducer and preparation method thereof
  • A kind of anti-mud type polycarboxylate water reducer and preparation method thereof

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preparation example Construction

[0034] The preparation method of the above-mentioned anti-mud type polycarboxylate water-reducing agent comprises the following steps:

[0035] Step 1, dissolving the multi-arm polymer precursor in part of dimethyl sulfoxide to form a bottom liquid;

[0036] Step 2, dissolving methacrylic polyethylene glycol ether, unsaturated acid monomer, acryloyloxyethyltrimethylammonium chloride and chain transfer agent in part of dimethyl sulfoxide to form material A;

[0037] Step 3, the initiator is dissolved in part dimethyl sulfoxide to form B material;

[0038] Step 4, heat the bottom material to 62°-68°, start to drip A and B materials at a constant speed, and keep the temperature at 62°-68° for 3.0h after the dripping is completed;

[0039] Step 5: After the heat preservation is completed, the solution is cooled to room temperature, the impurities are removed by dialysis, and then the solvent is removed to obtain an anti-sludge type polycarboxylate water-reducing agent.

[0040] ...

Embodiment 1

[0045]Dissolve polyvinyl alcohol in dimethyl sulfoxide at 50 °C to form a PVA solution with a concentration of 2%, add 2 times the mass of polyvinyl alcohol with acryloyl chloride and an appropriate amount of concentrated sulfuric acid into the PVA solution, and reflux at 50 °C for 3 hours. Then stop the reaction. The solution is poured into a beaker filled with water, precipitated, filtered, washed, and dried in a vacuum drying oven to obtain a multi-arm polymer precursor. Dissolve 6.5 parts of the multi-arm polymer precursor in part of dimethyl sulfoxide to form a bottom liquid, 28 parts of methacrylic polyglycol ether, 22 parts of acrylic acid, 13 parts of acryloyloxyethyl trimethyl chloride Ammonium, 1.2 parts of 2,4-diphenyl-4-methyl-1-pentene were dissolved in part of dimethyl sulfoxide to form feed A, and 0.9 parts of dibenzoyl peroxide was dissolved in part of dimethyl sulfoxide Form B material in the sulfone, heat the bottom material to 65±3°, start adding A and B ma...

Embodiment 2

[0047] Dissolve polyvinyl alcohol in dimethyl sulfoxide at 50 °C to form a PVA solution with a concentration of 3%, add 2 times the mass of polyvinyl alcohol with acryloyl chloride and an appropriate amount of concentrated sulfuric acid into the PVA solution, and reflux at 50 °C for 3 hours. Then stop the reaction. The solution is poured into a beaker filled with water, precipitated, filtered, washed, and dried in a vacuum drying oven to obtain a multi-arm polymer precursor. Dissolve 8 parts of the multi-arm polymer precursor in part of dimethyl sulfoxide to form a bottom liquid, mix 30 parts of methacrylic polyglycol ether, 20 parts of methacrylic acid, 10 parts of acryloyloxyethyl trimeth Ammonium chloride and 0.8 parts of isooctyl 3-mercaptopropionate are dissolved in part of dimethyl sulfoxide to form A material, 1.5 parts of dibenzoyl peroxide are dissolved in part of dimethyl sulfoxide to form B material, and The bottom material is heated up to 65±3°, and the A and B ma...

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Abstract

The mud-resistant polycarboxylate water-reducer of the present invention and its preparation method belong to the technical field of polycarboxylate water-reducers for concrete, and are prepared from the following raw materials: multi-arm polymer precursor, methpropylene polyethylene glycol ether , Unsaturated acid monomer, acryloyloxyethyltrimethylammonium chloride, chain transfer agent, initiator. The anti-mud type polycarboxylate water-reducer disclosed by the present invention has a multi-arm molecular structure containing quaternary ammonium salt functional groups, which can reduce the surface adsorption of clay on water-reducer molecules, and can also inhibit the expansion of clay, making clay intercalation The distance between them becomes smaller, thereby reducing the adsorption capacity of the clay on the polycarboxylate superplasticizer, and finally achieves the effect of "mud resistance". The water reducer has the advantages of long slump retention time and strong mud resistance, can avoid adverse effects caused by mud-containing aggregates in concrete, has simple and reasonable preparation method, high efficiency and low cost, and is suitable for industrial production. The performance of the product is stable, and the product is a green and environmentally friendly water-soluble polymer.

Description

technical field [0001] The invention relates to the technical field of polycarboxylate water-reducing agents for concrete, in particular to a mud-resistant polycarboxylic acid-based water-reducing agent and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer (PCE) has gradually replaced other types of superplasticizers due to its good molecular structure designability, high concrete water reduction rate, good slump retention performance over time, environmental friendliness, and superior durability. , developed into a new generation of widely used water reducer. [0003] However, with the rapid development of my country's construction industry, a large number of high-quality concrete raw materials are consumed, and more and more concrete projects are forced to use sand and gravel with poor quality and high mud content. However, the polycarboxylate superplasticizer has a strong sensitivity to the mud content in the sand and gravel. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F261/04C08F220/06C08F220/34C08F212/12C04B24/26C04B103/30
CPCC08F283/065C08F261/04C04B24/2694C04B2103/302C08F220/06C08F220/34C08F212/12
Inventor 王博孙金桥屈建霍亮廖娟
Owner CHINA STATE CONSTRUCTION ENGINEERING CORPORATION
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