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Esterification product, low-hydration-heat ether polycarboxylic acid water reducing agent and preparation method of low-hydration-heat ether polycarboxylic acid water reducing agent

A technology of water reducing agent and polycarboxylic acid, applied in the field of concrete admixtures, can solve the problems of poor adaptability of hydration heat inhibitor and water reducing agent and cement, non-coagulation of concrete, etc., to achieve strong binding ability and reduce hydration heat. , the effect of improving workability

Active Publication Date: 2022-03-11
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 poor adaptability between heat of hydration inhibitors, water reducing agents and cement, and the long-term non-condensation of concrete caused by compound retarders, the present invention provides an esterification product, which is mainly composed of functional monomer A and unsaturated It is obtained by esterification reaction of acid;

Method used

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  • Esterification product, low-hydration-heat ether polycarboxylic acid water reducing agent and preparation method of low-hydration-heat ether polycarboxylic acid water reducing agent
  • Esterification product, low-hydration-heat ether polycarboxylic acid water reducing agent and preparation method of low-hydration-heat ether polycarboxylic acid water reducing agent
  • Esterification product, low-hydration-heat ether polycarboxylic acid water reducing agent and preparation method of low-hydration-heat ether polycarboxylic acid water reducing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A1. Preparation of esterification product: by weight, 98 parts of acrylic acid and 100 parts of 4-hydroxyphenylboronic acid pinacaester were added to the first reaction vessel for mixing. Under nitrogen protection conditions, 1.59 parts of cerium sulfate and 2.97 parts of hydroquinone, and adjust the reaction temperature to 120°C, and react for 5 hours to obtain the esterification product;

[0039]A2, copolymerization reaction: in parts by weight, first prepare 5 parts of the esterification product prepared by A1, 100 parts of 4-hydroxybutyl vinyl ether polyoxyethylene ether with a molecular weight of 3000, and 0.8 part of sorbitol polyoxyethylene ether tetra-oil Ester and 119 parts of water, add to the second reaction vessel and stir evenly, mix 2 parts of ammonium persulfate and 20 parts of water evenly in the first dropping device; mix 2 parts of sodium hypophosphite, 1.2 parts of thioglycolic acid and 20 parts of water Uniformly in the second dropping device; 8 part...

Embodiment 2

[0042] B1, preparation of esterification product: in parts by weight, add 58.6 parts of methacrylic acid and 100 parts of 4-hydroxyphenylboronic acid pinacolate into the first reaction vessel and mix them. Under the condition of nitrogen protection, add 2.38 parts of concentrated sulfuric acid, 0.80 part of diphenylamine, and adjust the reaction temperature to 135°C, and react for 4 hours to obtain the esterification product;

[0043] B2, copolymerization reaction: by weight, earlier the esterification product that 3 parts of B1 make, methallyl alcohol polyoxyethylene ether of 100 parts of molecular weight 2400, 1.5 parts of sorbitol polyoxyethylene ether tetraoleate and Add 113 parts of water into the second reaction vessel and stir evenly, mix 1.5 parts of hydrogen peroxide and 20 parts of water evenly in the first dropping device; mix 0.8 parts of ascorbic acid, 2 parts of n-butanthiol and 20 parts of water in the second In the adding device; 4 parts of acrylic acid, 5 part...

Embodiment 3

[0046] C1. Preparation of esterification product: In parts by weight, add 156 parts of methacrylic acid and 100 parts of 4-hydroxyphenylboronic acid pinacidate into the first reaction vessel for mixing, and add 6.4 parts of p-toluenesulfonic acid under the condition of nitrogen protection , 5.12 parts of methyl hydroquinone, and adjust the reaction temperature to 125°C, and react for 6 hours to obtain the esterification product;

[0047] C2, copolymerization reaction: by weight, 6 parts of the esterification product prepared by C1, 100 parts of allyl polyoxyethylene polyoxypropylene ether with a molecular weight of 3000, and 0.5 part of sorbitol polyoxyethylene ether tetraoleate and 123 parts of water, added to the second reaction vessel and stirred evenly, 3 parts of potassium persulfate and 20 parts of water were mixed uniformly in the first dropping device; 2.5 parts of 2-hydroxy-2-sulfinic acid disodium salt, Mix 0.5 parts of 3-mercaptopropionic acid and 20 parts of water ...

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Abstract

The invention relates to the field of concrete admixtures, in particular to an esterification product, a low-hydration-heat ether polycarboxylic acid water reducer and a preparation method of the low-hydration-heat ether polycarboxylic acid water reducer. The low-hydration-heat ether polycarboxylic acid water reducer comprises an esterification product, unsaturated polyoxyethylene ether, acrylic acid, an unsaturated ester monomer and a functional monomer B, the functional monomer B is a monomer with double bonds and borate radicals. The low-hydration-heat ether polycarboxylic acid water reducing agent provided by the invention has better dispersing capacity and adaptability to cement, aggregate impurities and environment, remarkably improves the workability of concrete, can further complex calcium ions in the concrete, is strong in binding capacity, effectively reduces the hydration heat of high-strength concrete, and improves the water reducing efficiency. Good application prospects and popularization values are realized.

Description

technical field [0001] The invention relates to the field of concrete admixtures, in particular to an esterification product, a low hydration heat ether polycarboxylate water reducer and a preparation method thereof. Background technique [0002] With the continuous development of infrastructure, concrete structures are gradually moving towards the direction of complexity, high strength, and high performance. Various long-span and new-type structural bridges continue to appear, and higher requirements are placed on the performance of concrete. High-strength self-compacting concrete has high strength and excellent working performance. Its self-compacting performance can meet the needs of complex structure construction such as small operating space, difficult vibration, and dense steel bars. High strength can effectively resist external damage. [0003] In order to meet the high strength, high fluidity, and high filling properties of high-strength self-compacting concrete, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F5/02C08F283/06C08F230/02C08F220/06C08F220/20C08F220/14C04B24/26C04B103/30
CPCC07F5/025C08F283/065C04B24/2694C04B2103/302C08F230/02C08F220/06C08F220/20C08F220/14Y02W30/91
Inventor 张小芳林志君方云辉郭元强陈展华柯余良肖悦
Owner KZJ NEW MATERIALS GROUP CO LTD
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