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Low-creep high-efficiency polycarboxylate superplasticizer and preparation method thereof

A technology of polycarboxylate and water reducer, which is applied in the field of preparation of low-creep high-efficiency polycarboxylate water reducer, can solve the problem of less water reducer, and achieve the effect of strengthening steric hindrance, increasing compactness, and uniform dispersion Effect

Active Publication Date: 2021-12-10
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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  • Low-creep high-efficiency polycarboxylate superplasticizer and preparation method thereof

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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: 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 1mol double-end unsaturated ether macromonomer;

[0028] (2) After mixing 1 mol of ethylenediamine and 1 mol of glycidyl methacrylate, react at a constant temperature of 60° C. for 3 hours to prepare 1 mol of unsaturated amine monomer;

[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 silicon amine monomer;

[0030] (4) Dissolve 50g of double-ended unsaturated ether macromonomer, 20g of unsaturated amine monomer, 20g of unsaturated silicon amine monomer, 0.5g of hydrogen peroxide and 5g of acrylic acid in 80g of deionized water, under constant temperature conditions of 30°C Stir evenly, then mix 5g of ac...

Embodiment 2

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

[0033] (2) After mixing 1 mol of diethylenetriamine and 1 mol of glycidyl methacrylate, react at a constant temperature of 70° C. for 3 hours to prepare 1 mol of unsaturated amine monomer;

[0034] (3) After mixing 1 mol of aminopropyltriethoxysilane and 1 mol of glycidyl methacrylate, react at a constant temperature of 70° C. for 3 hours to prepare 1 mol of unsaturated silicon amine monomer;

[0035] (4) Dissolve 40g of double-ended unsaturated ether macromonomer, 30g of unsaturated amine monomer, 20g of unsaturated silicon amine monomer, 0.5g of hydrogen peroxide and 5g of acrylic acid in 80g of deionized water, at a constant temperature of 30°C Stir evenly, then mix 5g of ...

Embodiment 3

[0037] (1) After mixing 1 mol of methallyl polyoxyethylene ether (molecular mass: 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 1mol double-end unsaturated ether macromonomer;

[0038] (2) After mixing 1 mol of ethylenediamine and 1 mol of glycidyl methacrylate, react at a constant temperature of 60° C. for 3 hours to prepare 1 mol of unsaturated amine monomer;

[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 silicon amine monomer;

[0040] (4) Dissolve 50g of double-ended unsaturated ether macromonomer, 20g of unsaturated amine monomer, 20g of unsaturated silicon amine monomer, 0.5g of hydrogen peroxide and 5g of acrylic acid in 80g of deionized water, under constant temperature conditions of 30°C Stir evenly, then mix 5g of ac...

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Abstract

The invention discloses a low-creep high-efficiency polycarboxylate superplasticizer, and discloses a formula and a synthesis process of the low-creep high-efficiency polycarboxylate superplasticizer in detail. The low-creep high-efficiency polycarboxylate superplasticizer is prepared from the following components in parts by weight: 30 to 60 parts of double-end unsaturated ether macromonomers, 20 to 40 parts of unsaturated amine monomers, 20 to 40 parts of unsaturated silicon amine monomers, 5 to 15 parts of unsaturated small monomers, 0.01 to 1 part of a reducing agent, 0.01 to 1 part of an oxidizing agent, 1 to 5 parts of a chain transfer agent, 1 to 5 parts of a catalyst and 200 to 300 parts of water. The preparation method comprises the following steps of: (1) preparing a double-end unsaturated ether macromonomer; (2) preparing an unsaturated amine monomer; (3) preparing an unsaturated silicon amine monomer; and (4) preparing the water reducing agent. The water reducing agent provided by the invention has the advantages of high water reducing rate, strong applicability, capability of reducing concrete creep and the like.

Description

technical field [0001] The invention relates to a preparation method of a low-creep type high-efficiency polycarboxylate water reducer, which 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 hydropower stations. Concrete is the most widely used building material in the above-mentioned projects, and it is required to have small long-term deformation under stress, that is, a low degree of creep. However, the current creep of ordinary concrete and high-strength concrete is relatively 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 to the con...

Claims

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Application Information

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Patent Type & Authority Applications(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