Anti-mud polycarboxylic acid water reducing agent and preparation method thereof

A technology of polycarboxylic acid series and water reducing agent, which is applied in the field of polycarboxylate water reducing agent for concrete, can solve the problem of reducing concrete water reducing rate and slump retention performance, increasing the content of PCE water reducing agent, and prolonging the setting time of concrete. and other problems, to achieve the effect of reducing surface adsorption, avoiding adverse effects, and easy control of reaction conditions

Active Publication Date: 2020-12-25
CHINA STATE CONSTRUCTION ENGINEERING CORPORATION +1
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  • Abstract
  • Description
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  • Application Information

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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  • Anti-mud polycarboxylic acid water reducing agent and preparation method thereof
  • Anti-mud polycarboxylic acid water reducing agent and preparation method thereof

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preparation example Construction

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

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

[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, dissolving the initiator in part of dimethyl sulfoxide to form material B;

[0038] Step 4: Warm up the base material to 62°-68°, start to add A and B materials dropwise at a constant speed, and keep warm for 3.0 hours under the condition of 62°-68° after the dropwise addition;

[0039] Step 5: After the heat preservation is completed, cool the solution to room temperature, dialyze to remove impurities, and then remove the solvent to obtain a mud-resistant polycarboxylate superplasticizer.

[0040] The prepara...

Embodiment 1

[0045]Dissolve polyvinyl alcohol in dimethyl sulfoxide at 50°C to form a PVA solution with a concentration of 2%, add acryloyl chloride twice the mass of polyvinyl alcohol and an appropriate amount of concentrated sulfuric acid into the PVA solution, and reflux at 50°C for 3 hours After stopping the reaction. Pour the solution into a beaker filled with water, precipitate out, filter with suction, wash, and dry in a vacuum 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 base liquid, and chlorinate 28 parts of methacrylic polyglycol ether, 22 parts of acrylic acid, and 13 parts of acryloyloxyethyl trimethyl Ammonium, 1.2 parts of 2,4-diphenyl-4-methyl-1-pentene are dissolved in part of dimethyl sulfoxide to form material A, and 0.9 parts of dibenzoyl peroxide are dissolved in part of dimethyl sulfoxide Form material B in the sulfone, raise the temperature of the base material to 65±3°, s...

Embodiment 2

[0047] Dissolve polyvinyl alcohol in dimethyl sulfoxide at 50°C to form a PVA solution with a concentration of 3%, add acryloyl chloride twice the mass of polyvinyl alcohol and an appropriate amount of concentrated sulfuric acid into the PVA solution, and reflux at 50°C for 3 hours After stopping the reaction. Pour the solution into a beaker filled with water, precipitate out, filter with suction, wash, and dry in a vacuum 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 base liquid, and 30 parts of methacrylic acid polyglycol ether, 20 parts of methacrylic acid, 10 parts of acryloyloxyethyltrimethyl Ammonium chloride and 0.8 parts of isooctyl 3-mercaptopropionate are dissolved in part of dimethyl sulfoxide to form material A, and 1.5 parts of dibenzoyl peroxide are dissolved in part of dimethyl sulfoxide to form material B. Heat up the base material to 65±3°, start dropping A and B mater...

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Abstract

The invention discloses an anti-mud polycarboxylate water reducer and a preparation method thereof, and belongs to the technical field of polycarboxylate water reducers for concrete. The anti-mud polycarboxylate water reducer is prepared from the following raw materials: a multi-arm polymer precursor, methallyl polyethylene glycol ether, an unsaturated acid monomer, acryloyloxyethyl trimethyl ammonium chloride, a chain transfer agent and an initiator. The anti-mud polycarboxylate-type water reducing agent disclosed by the invention has a multi-arm molecular structure containing quaternary ammonium salt functional groups, can reduce the surface adsorption effect of clay on water reducing agent molecules, and can also inhibit the expansion of the clay, so that the intercalation spacing of the clay is reduced, the adsorption capacity of the clay on the polycarboxylate-type water reducing agent is reduced, and finally, the mud-resistant effect is achieved. The water reducing agent has theadvantages of long slump retaining time and strong mud resistance, can avoid adverse effects caused by mud-containing aggregate in concrete, and is simple and reasonable in preparation method, high inefficiency, low in cost and suitable for industrial production. The product is stable in performance and is a green and environment-friendly water-soluble polymer.

Description

technical field [0001] The invention relates to the technical field of polycarboxylate water reducer for concrete, in particular to a mud-resistant polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer (PCE) has gradually replaced other types of superplasticizers due to its advantages such as good molecular structure design, high concrete water-reducing rate, good slump performance over time, environmental friendliness, and superior durability. , developed into a new generation of widely used water reducing agent. [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 poor-quality sand and gravel with high mud content. However, the polycarboxylate superplasticizer has a strong sensitivity to the mud content in the sand and gravel, which is mainly manifes...

Claims

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Application Information

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Patent Type & Authority Applications(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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