Reduction type ether polycarboxylic acid water reducer and preparation method thereof

A technology of ether polycarboxylic acid and water reducing agent, which is applied in the field of concrete admixture, can solve the problems of non-condensing of concrete, high cost of shrinkage reducing agent and expansion agent, so as to prevent shrinkage cracking, ensure workability, and increase steric resistance effect of effect

Active Publication Date: 2022-03-25
KZJ NEW MATERIALS GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems of shrinkage and cracking of concrete, high cost of adding shrinkage reducing agent and expansion agent, and long-term non-condensation of concrete caused by compound retarder, the present invention provides a shrinkage-reducing ether polycarboxylate water reducer, including esterification products, ether Macromonomer, acrylic acid, unsaturated esterified monomer, functional monomer B;

Method used

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  • Reduction type ether polycarboxylic acid water reducer and preparation method thereof
  • Reduction type ether polycarboxylic acid water reducer and preparation method thereof
  • Reduction type ether polycarboxylic acid water reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A1, preparation of esterification product: preparation of esterification product: in parts by weight, add 72 parts of acrylic acid and 100 parts of 4-hydroxyphenylboronic acid pinacaester into the first reaction vessel for mixing, and under nitrogen protection conditions, add 3.6 parts of para Toluenesulfonic acid, 2.8 parts of hydroquinone, and adjust the reaction temperature to 120°C, and react for 5 hours to obtain the esterified product;

[0038]A2, copolymerization reaction: by weight, first 5 parts of the esterification product prepared by A1, 100 parts of 4-hydroxybutyl vinyl ether polyoxyethylene ether with a molecular weight of 4000, 2 parts of trans-2-[4- (Trifluoromethyl)phenyl]vinylboronic acid, 0.7 part of polyoxyethylene sorbitan tetraoleate and 118 parts of water are added into the second reaction vessel and stirred evenly, and 0.8 part of ammonium persulfate is mixed with 20 parts of water evenly In the first dropping device; 3 parts of ferrous sulfate, ...

Embodiment 2

[0041] B1, preparation of esterification product: by weight, 156.3 parts of methacrylic acid, 100 parts of 4-hydroxyphenylboronic acid pinacidate are added in the first reaction vessel and mixed, under the condition of nitrogen protection, 2 parts of concentrated sulfuric acid are added, 7.7 part of diphenylamine, and adjust the reaction temperature to 135°C, and react for 5 hours to obtain the esterified product;

[0042] B2, copolymerization reaction: by weight, earlier the esterification product that 7 parts of B1 make, the ethylene glycol monovinyl polyoxypropylene ether of 100 parts of molecular weight 2400, 1.4 parts of trans-2-[4-(three Fluoromethyl)phenyl]vinylboronic acid, 1.2 parts of polyoxyethylene sorbitan tetraoleate and 131 parts of water are added to the second reaction vessel and stirred evenly, and 1.5 parts of sodium persulfate and 20 parts of water are mixed evenly in the second reaction vessel In one dropping device; 1 part of sodium hypophosphite, 2 parts...

Embodiment 3

[0045] C1. Preparation of esterification product: In parts by weight, add 66.4 parts of methacrylic acid and 100 parts of 4-hydroxyphenylboronic acid pinacidate into the first reaction vessel for mixing, and add 2.3 parts of p-toluenesulfonic acid under the condition of nitrogen protection , 3.5 parts of methyl hydroquinone, and adjust the reaction temperature to 125°C, and react for 4 hours to obtain the esterification product;

[0046] C2, copolymerization reaction: by weight, first the esterification product that 6 parts of C1 make, 100 parts of methallyl monomethyl ether polyoxyethylene ether of molecular weight 3000, 0.8 part of trans-2-[4- (Trifluoromethyl) phenyl] vinyl boronic acid, 2 parts of polyoxyethylene sorbitan tetraoleate and 129 parts of water, add in the second reaction vessel and stir evenly, 2.8 parts of tert-butyl hydroperoxide and 20 parts Mix water in the first dropping device; mix 2.6 parts of ascorbic acid, 0.5 parts of potassium hypophosphite and 20 p...

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Abstract

The invention relates to the field of concrete admixtures, in particular to a shrinkage-reducing ether polycarboxylic acid water reducer and a preparation method thereof. The reduction type ether polycarboxylic acid water reducer is characterized by comprising an esterification product, an ether macromonomer, acrylic acid, an unsaturated ester monomer and a functional monomer B, the esterification product is mainly obtained by performing esterification reaction on a functional monomer A and unsaturated acid; the functional monomer A is a monomer with a benzene ring, borate and hydroxyl; the functional monomer B is a monomer with a double bond, a benzene ring, a borate radical and a fluorocarbon bond. The shrinkage-reducing ether polycarboxylic acid water reducer provided by the invention can effectively reduce the surface tension of concrete, has better dispersing capacity, and can obviously improve the shrinkage-reducing effect of the concrete. Meanwhile, the hydration speed of the concrete can be further delayed, shrinkage cracking caused by temperature is prevented, and good application prospects and popularization value are achieved.

Description

technical field [0001] The invention relates to the field of concrete admixtures, in particular to a shrinkage-reducing ether polycarboxylate water reducer and a preparation method thereof. Background technique [0002] One of the reasons for cracks in concrete is plastic shrinkage, and the cracking caused by shrinkage will affect the service life and actual performance of concrete. Especially concrete components and engineering structures of bridges and high-rise buildings, once cracked, it will affect the overall performance of the building. Therefore, it is necessary to solve the shrinkage cracking problem of high performance concrete. At present, shrinkage reducing agents, expansion agents or fibers are usually used to compensate the plastic shrinkage of concrete at home and abroad, but the amount of addition is large, and the project cost increases. The current research hotspot is the synthesis of a polycarboxylate water reducer with shrinkage reduction function. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F230/06C08F220/06C08F220/20C08F220/14C04B24/26C04B103/30
CPCC08F283/065C04B24/2694C04B2103/302C08F230/065C08F220/06C08F220/20C08F220/14
Inventor 林志君张小芳柯余良郭元强陈展华肖悦
Owner KZJ NEW MATERIALS GROUP CO LTD
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