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Mud-resistant water reducing agent and preparation method thereof

A mud-resistant and water-reducing agent technology, which is applied in the field of construction admixtures, can solve problems such as the decline in concrete work performance, the dispersion performance, fluidity and retention performance of polycarboxylate superplasticizers, etc.

Pending Publication Date: 2022-02-01
垒知化学(福建)有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, when the concrete raw materials contain clay impurities (such as montmorillonite), the anionic functional groups in the polycarboxylate superplasticizer can easily adsorb and intercalate with the clay impurities in the concrete raw materials. increase, the dispersibility, fluidity and retention performance of the polycarboxylate superplasticizer are significantly reduced, resulting in a substantial decline in the working performance of concrete

Method used

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

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preparation example Construction

[0067] The present invention also provides a preparation method of an anti-mud type water reducer, comprising the steps of:

[0068] In parts by weight, 300-500 parts of ethylene glycol monovinyl polyoxyethylene ether, 3-30 parts of unsaturated carboxylic acid monomer, 3-15 parts of aromatic aldehyde chitosan quaternary ammonium salt, 0.5-3 parts The oxidizing agent, 26-150 parts of liquid A, 11-100 parts of liquid B and 300-500 parts of water are placed in the reactor for reaction, and the mud-resistant superplasticizer is obtained after the reaction;

[0069] Wherein, liquid A includes unsaturated carboxylic acid monomer, aromatic aldehyde chitosan quaternary ammonium salt, unsaturated carboxylic acid ester monomer and water;

[0070] Liquid B includes reducing agent, chain transfer agent and water.

[0071] Specifically, the anti-mud type water reducer provided by the present invention is composed of ethylene glycol monovinyl polyoxyethylene ether, unsaturated carboxylic a...

Embodiment 1

[0114] In terms of weight fraction, 440 parts of ethylene glycol monovinyl polyoxyethylene ether and 400 parts of water are placed in the first reaction vessel and stirred at room temperature until completely dissolved, then 3 parts of acrylic acid and 2 parts of aromatic aldehyde chitosan are added The quaternary ammonium salt is stirred to make the first mixed solution;

[0115] After the first mixing temperature drops to 10-20°C, add 1.5 parts of hydrogen peroxide and 0.2 parts of 1% ferrous ion solution to the first mixed solution, and stir for 5-10 minutes to obtain the second mixed solution;

[0116] Add liquid A and liquid B dropwise to the second mixed liquid at the same time. After the dropwise addition is completed, the dropwise addition time is 40-50 minutes. liquid;

[0117] A neutralizing agent was added dropwise to the third mixed solution to adjust the pH to 5-7, and 25 parts of water was replenished to obtain an anti-mud type superplasticizer with a solid cont...

Embodiment 2

[0121] In terms of weight fraction, 440 parts of ethylene glycol monovinyl polyoxyethylene ether and 400 parts of water are placed in the first reaction vessel and stirred at room temperature until completely dissolved, then 3 parts of acrylic acid and 2 parts of aromatic aldehyde chitosan are added The quaternary ammonium salt is stirred to make the first mixed solution;

[0122] After the first mixing temperature drops to 10-20°C, add 1.5 parts of hydrogen peroxide and 0.2 parts of 1% ferrous ion solution to the first mixed solution, and stir for 5-10 minutes to obtain the second mixed solution;

[0123] Add liquid A and liquid B dropwise to the second mixed solution at the same time. After the dropwise addition is completed, the dropwise addition time is 40-50 minutes. After the dropwise addition is completed, the reaction temperature is 10-35° C. to obtain the third mixed solution;

[0124] A neutralizing agent was added dropwise to the third mixed solution to adjust the p...

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Abstract

The invention relates to a mud-resistant water reducing agent and a preparation method thereof. The mud-resistant water reducing agent is prepared from the following raw materials in parts by weight: 300-500 parts of ethylene glycol monovinyl polyoxyethylene ether, 3-30 parts of an unsaturated carboxylic acid monomer, 3-15 parts of aromatic aldehyde chitosan quaternary ammonium salt, 26-150 parts of a liquid A, 0.5-3 parts of an oxidizing agent, 11-100 parts of a liquid B, and 300-500 parts of water, wherein the liquid A comprises an unsaturated carboxylic acid monomer, aromatic aldehyde chitosan quaternary ammonium salt, an unsaturated carboxylic ester monomer and water; and the liquid B comprises a reducing agent, a chain transfer agent and water. According to the mud-resistant water reducing agent and the preparation method thereof provided by the invention, the aromatic aldehyde chitosan quaternary ammonium salt is grafted on the side chain of ethylene glycol monovinyl polyoxyethylene ether, so the mud-resistant performance of the water reducing agent is improved.

Description

technical field [0001] The invention relates to the technical field of building admixtures, in particular to a mud-resistant water reducer and a preparation method thereof. Background technique [0002] Conventional polycarboxylate superplasticizers are comb-shaped linear polymers with long chain branches, containing a large number of anionic functional groups (-OH, -COOH), which can be adsorbed on the surface of cement particles in concrete through electrostatic repulsion and space The steric hindrance disperses the cement particles and avoids agglomeration, thereby effectively increasing the dispersion performance, fluidity and retention of concrete. [0003] However, when the concrete raw materials contain clay impurities (such as montmorillonite), the anionic functional groups in the polycarboxylate superplasticizer can easily adsorb and intercalate with the clay impurities in the concrete raw materials. Increase, the dispersibility, fluidity and retention performance o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F251/00C08F220/06C08F220/20C04B24/26C04B24/38C04B103/30
CPCC08F283/065C08F251/00C04B24/2694C04B24/38C04B2103/302C08F220/06C08F220/20
Inventor 肖悦方云辉饶帮礼李乐民郭元强陈展华
Owner 垒知化学(福建)有限公司
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