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A shrinkage-reducing polycarboxylate water reducer and its preparation method

A technology of polycarboxylic acid and water reducing agent, which is applied in the field of construction admixtures and can solve problems such as low water reducing rate and poor shrinkage reduction effect

Active Publication Date: 2021-11-19
KZJ NEW MATERIALS GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of the existing shrinkage-reducing water-reducer mentioned in the above-mentioned background technology that not only the water-reducing rate is low but also the shrinkage-reducing effect is poor, the present invention provides a shrinkage-reducing polycarboxylate water-reducer, which also includes the following components: esterification product , unsaturated polyoxyethylene ether, emulsifier, initiator solution, chain transfer agent solution, ester macromonomer, acrylic acid, shrinkage functional monomer and unsaturated sulfonate mixed solution;

Method used

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  • A shrinkage-reducing polycarboxylate water reducer and its preparation method
  • A shrinkage-reducing polycarboxylate water reducer and its preparation method
  • A shrinkage-reducing polycarboxylate water reducer and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0035] (1) Preparation of esterification products: in parts by weight, add 101 parts of fumaric acid and 100 parts of cocoic acid diethanolamide into the first reaction vessel and mix them. Under nitrogen conditions, add 0.75 parts of antimony trioxide, 0.45 Parts of methyl hydroquinone, and adjust the temperature at 110 ° C, react for 5 hours, that is, monomers with amide and double hydroxyl groups and unsaturated esterification products are obtained;

[0036](2) Copolymerization reaction: in parts by weight, 3 parts of the esterification product prepared in step (1), 70 parts of allyl polyoxyethylene polyoxypropylene ether with a molecular weight of 3000 and 30 parts of monoacrylic acid polyoxyethylene ether with a molecular weight of 600 Ethylene glycol ester, 0.45 parts of sodium dodecylbenzene sulfonate, 0.9 parts of diethylene glycol monolaurate and 113 parts of water are added into the second reaction vessel and stirred evenly, and 1.5 parts of hydrogen peroxide and 20 p...

Embodiment 2

[0039] (1) Preparation of esterification product: In parts by weight, 87.8 parts of acrylic acid and 100 parts of cocoic acid diethanolamide are added to the first reaction vessel for mixing, and under nitrogen conditions, 2.17 parts of cerium sulfate and 1.16 parts of 4-hydroxyl piperidinol oxygen free radical, and adjust the temperature at 120°C, and react for 6 hours to obtain monomers with amide and double hydroxyl groups and unsaturated esterified products;

[0040] (2) Copolymerization reaction: in parts by weight, first prepare 2 parts of esterification products obtained in step (1), 70 parts of methallyl polyoxyethylene polyoxypropylene ethers with a molecular weight of 3000 and 30 parts of monopolyoxypropylene ethers with a molecular weight of 1000. Add polyethylene glycol methoxyether monoacrylate, 0.5 parts of sodium dodecylbenzene sulfonate, 1 part of diethylene glycol monolaurate and 130 parts of water into the second reaction vessel and stir evenly, 1.5 parts over...

Embodiment 3

[0043] (1) Preparation of esterification products: in parts by weight, 81 parts of fumaric acid and 100 parts of cocoic acid diethanolamide are added to the first reaction vessel for mixing, and under nitrogen conditions, 4 parts of cerium sulfate and 2.4 parts of formazan are added. Hydroquinone, and adjust the temperature at 80°C, and react for 5 hours to obtain monomers and unsaturated esterification products with amides and dihydroxy groups;

[0044] (2) Copolymerization reaction: in parts by weight, 1 part of the esterified product obtained in step (1), 70 parts of allyl alcohol polyoxyethylene ether with a molecular weight of 3000 and 30 parts of monomethoxyl ether with a molecular weight of 2400 Polyethylene glycol methacrylate, 0.3 parts of sodium dodecylbenzenesulfonate, 0.6 parts of diethylene glycol monolaurate and 119 parts of water are added to the second reaction vessel and stirred evenly, 2.5 parts of hydrogen peroxide and 20 parts of Water is mixed evenly in th...

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Abstract

The invention relates to the technical field of building admixtures, in particular to a shrinkage-reducing polycarboxylate water reducer and a preparation method thereof. The water reducer includes: esterification product, unsaturated polyoxyethylene ether, emulsifier, initiator solution, chain transfer agent solution, ester macromonomer, acrylic acid, shrinkage functional monomer and unsaturated sulfonate mixed solution . The preparation method includes the preparation of esterification products; copolymerization reaction; neutralization reaction; esterification of coconut acid diethanolamide and unsaturated acid to prepare esterification products, which has the advantages of low cost and easy operation, and the obtained The esterification product is copolymerized with the shrinkage-reducing functional monomer, so that the main chain of the polycarboxylate water-reducer has hydrophilic groups such as amides and shrinkage-reducing groups, and the prepared polycarboxylate water-reducer has a lower surface tension. It effectively reduces the drying shrinkage of concrete, effectively improves the mechanical properties and strength of concrete, and has significant application value.

Description

technical field [0001] The invention relates to the technical field of building admixtures, in particular to a shrinkage-reducing polycarboxylate water reducer and a preparation method thereof. Background technique [0002] As a new type of water reducer, polycarboxylate water reducer has the advantages of low dosage, high water reducing rate, good slump retention, small shrinkage, relatively good adaptability to cement and admixtures, and obvious reinforcement effect. The outstanding performance of the series has been widely used in various engineering fields. With the construction of national large-scale infrastructure nuclear power, water conservancy, bridges and various large-scale projects, the performance requirements of concrete are constantly improving. It also has the effect of reducing the drying shrinkage of hardened concrete. This multifunctional polycarboxylate water reducer has become a hot research topic at home and abroad. [0003] The first kind of shrinka...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F228/02C08F2/26C04B24/16C04B103/30
CPCC04B24/165C04B2103/302C08F2/26C08F283/065C08F220/06C08F228/02C04B24/00C04B24/24C04B24/26
Inventor 张小芳史艳娜方云辉林艳梅郭元强朱少宏
Owner KZJ NEW MATERIALS GROUP CO LTD