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A low-creep type high-efficiency polycarboxylate water reducer and its preparation method

A technology of water reducing agent and polycarboxylic acid, which is applied in the field of preparation of low creep type high-efficiency polycarboxylate water reducing agent, can solve the problem of less water reducing agent, etc. Effect

Active Publication Date: 2022-06-07
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing studies are all focused on the influence of polycarboxylate superplasticizer on concrete fluidity, strength and durability, and there are few studies and applications on the influence of superplasticizer on concrete creep.

Method used

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  • A low-creep type high-efficiency polycarboxylate water reducer and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0027] (1) After mixing 1 mol of methallyl polyoxyethylene ether (molecular mass of 3000) with 1 mol of glycidyl methacrylate, under the catalysis of 48.4 g of triphenylphosphine, react at a constant temperature of 180 ° C for 5 hours , to prepare 1 mol of double-end unsaturated ether macromonomers;

[0028] (2) after mixing 1mol of ethylenediamine with 1mol of glycidyl methacrylate, react at 60°C constant temperature for 3 hours to prepare 1mol of unsaturated amine monomers;

[0029] (3) after mixing 1 mol of aminopropyltrimethoxysilane and 1 mol of glycidyl methacrylate, react at a constant temperature of 60° C. for 3 hours to prepare 1 mol of unsaturated silicone amine monomers;

[0030] (4) Dissolve 50g of double-end unsaturated ether macromonomer, 20g of unsaturated amine monomer, 20g of unsaturated silicone amine monomer, 0.5g of hydrogen peroxide and 5g of acrylic acid in 80g of deionized water, under the condition of constant temperature of 30℃ Stir well, then mix 5g ...

Embodiment 2

[0032] (1) after mixing 1 mol of allyl polyoxyethylene ether (molecular mass of 3000) with 1 mol of glycidyl methacrylate, under the catalysis of 48.4 g of triphenylphosphine, react for 5 hours at a constant temperature of 150 ° C to prepare Obtain 1mol of double-end unsaturated ether macromonomer;

[0033] (2) after mixing 1mol of diethylenetriamine with 1mol of glycidyl methacrylate, react under 70 ℃ of constant temperature conditions for 3 hours to prepare 1mol of unsaturated amine monomers;

[0034] (3) after mixing 1 mol of aminopropyl triethoxysilane and 1 mol of glycidyl methacrylate, react at 70° C. constant temperature for 3 hours to prepare 1 mol of unsaturated silicone amine monomers;

[0035] (4) Dissolve 40g of double-ended unsaturated ether macromonomer, 30g of unsaturated amine monomer, 20g of unsaturated silicone amine monomer, 0.5g of hydrogen peroxide and 5g of acrylic acid in 80g of deionized water, under the condition of constant temperature of 30℃ Stir we...

Embodiment 3

[0037] (1) After mixing 1 mol of methallyl polyoxyethylene ether (molecular mass of 2000) with 1 mol of glycidyl methacrylate, under the catalysis of 48.4 g of triphenylphosphine, react at a constant temperature of 180 ° C for 5 hours , to prepare 1 mol of double-end unsaturated ether macromonomers;

[0038] (2) after mixing 1mol of ethylenediamine with 1mol of glycidyl methacrylate, react at 60°C constant temperature for 3 hours to prepare 1mol of unsaturated amine monomers;

[0039] (3) after mixing 1 mol of aminopropyltrimethoxysilane and 1 mol of glycidyl methacrylate, react at a constant temperature of 60° C. for 3 hours to prepare 1 mol of unsaturated silicone amine monomers;

[0040] (4) Dissolve 50g of double-end unsaturated ether macromonomer, 20g of unsaturated amine monomer, 20g of unsaturated silicone amine monomer, 0.5g of hydrogen peroxide and 5g of acrylic acid in 80g of deionized water, under the condition of constant temperature of 30℃ Stir well, then mix 5g ...

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Abstract

A low-creep type high-efficiency polycarboxylate superplasticizer was invented, and its formula and synthesis process were disclosed in detail. The low-creep type high-efficiency polycarboxylate water reducer is based on parts by weight, including 30-60 parts of double-ended unsaturated ether macromonomers, 20-40 parts of unsaturated amine monomers, and 20-20 parts of unsaturated silicon amine monomers. 40 parts, 5-15 parts of unsaturated small monomer, 0.01-1 part of reducing agent, 0.01-1 part of oxidizing agent, 1-5 parts of chain transfer agent, 1-5 parts of catalyst, 200-300 parts of water. The preparation method is as follows: (1) preparing double-end unsaturated ether macromonomer; (2) preparing unsaturated amine monomer; (3) preparing unsaturated silicon amine monomer; (4) preparing water reducer. The water reducing agent of the invention has the advantages of high water reducing rate, strong applicability, and ability to reduce concrete creep.

Description

technical field [0001] The invention relates to a preparation method of a low creep type high-efficiency polycarboxylate water reducer, and belongs to the field of admixtures in building materials. Background technique [0002] With the progress of society and the development of the construction industry, more and more super high-rise, long-span, and important buildings with special requirements have emerged, such as super-large bridges, skyscrapers, and large-scale hydropower stations. Concrete material is the most widely used building material in the above-mentioned projects. It is required to have small long-term deformation under the stress state, that is, to have a low degree of creep. At present, the creep of ordinary concrete and high-strength concrete is large, which cannot meet the above requirements. Therefore, new requirements are put forward for the creep of concrete. As a key factor affecting the safety and durability of concrete, creep is of great significance...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F290/06C08F220/36C08F230/08C08F220/06C08F222/06C04B24/26C04B103/30
CPCC08F290/062C04B24/2694C04B2103/302C08F220/36C08F230/085C08F220/06C08F222/06
Inventor 李悦田源黄舟吴玉生赵晨轶
Owner BEIJING UNIV OF TECH