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Ester polycarboxylic acid water reducer with low hydration heat and preparation method thereof

An ester polycarboxylic acid, low hydration heat technology, applied in the field of concrete admixtures, can solve problems such as poor adaptability and non-condensation of concrete, and achieve the effects of easy operation, reducing hydration heat, and maintaining slump

Pending Publication Date: 2022-03-01
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 reducers and cement, and the long-term non-condensation of concrete caused by compound retarders, the present invention provides a low heat of hydration ester polycarboxylate water reducer, including Esterification product, ester macromonomer, acrylic acid, unsaturated sulfonate, functional monomer B;

Method used

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  • Ester polycarboxylic acid water reducer with low hydration heat and preparation method thereof
  • Ester polycarboxylic acid water reducer with low hydration heat and preparation method thereof
  • Ester polycarboxylic acid water reducer with low hydration heat and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Preparation of A1 esterification product: in parts by weight, 117.2 parts of methacrylic acid and 100 parts of 4-hydroxyphenylboronic acid pinacidate were added to the first reaction vessel for mixing, and under nitrogen protection conditions, 3.3 parts of p-toluenesulfonic acid were added, 4.3 parts of methyl hydroquinone, and adjust the reaction temperature to 120°C, and react for 5 hours to obtain the esterified product;

[0038] A2 copolymerization reaction: in parts by weight, first with 3.5 parts of esterification products made in step A1, 100 parts of polyethylene glycol monomethacrylate with a molecular weight of 5000, 0.8 parts of polyoxyethylene sorbitol tetraoleate and Add 121 parts of water into the second reaction vessel and stir evenly, mix 2 parts of hydrogen peroxide and 20 parts of water in the first dropping device; mix 0.5 parts of ascorbic acid, 1.5 parts of thioglycolic acid and 20 parts of water in the second dropping device Medium; Mix 8 parts of ...

Embodiment 2

[0041] Preparation of B1 esterification product: in parts by weight, add 130 parts of acrylic acid and 100 parts of 4-hydroxyphenylboronic acid pinacolate into the first reaction vessel and mix them. Under nitrogen protection conditions, add 1.84 parts of concentrated sulfuric acid and 6.9 parts of diphenylamine , and adjust the reaction temperature to 125°C, and react for 4 hours to obtain the esterification product;

[0042] B2 copolymerization reaction: in parts by weight, first prepare 2 parts of the esterification product obtained in step B1, 100 parts of monomethoxy ether monoacrylate polyethylene glycol with a molecular weight of 3000, and 0.5 part of sorbitol polyoxyethylene ether tetra-oil Ester and 125 parts of water, add to the second reaction container and stir evenly, 3 parts of sodium persulfate and 20 parts of water are mixed evenly in the first dropping device; 2 parts of sodium hypophosphite, 2 parts of n-butyl mercaptan and 20 parts Water is mixed uniformly i...

Embodiment 3

[0045] Preparation of C1 esterification product: In parts by weight, 59 parts of methacrylic acid and 100 parts of 4-hydroxyphenylboronic acid pinacidate were added to the first reaction vessel for mixing, and under nitrogen protection conditions, 3.9 parts of cerium sulfate, 2.4 parts of Diphenylamine, and adjust the reaction temperature to 130°C, and react for 5h to obtain the esterification product;

[0046] C2 copolymerization reaction: in parts by weight, 5 parts of the esterification product prepared in step C1, 100 parts of monomethoxy ether monomethacrylate polyethylene glycol with a molecular weight of 3000, and 1.5 parts of sorbitol polyoxyethylene ether Tetraoleate and 119 parts of water are added into the second reaction vessel and stirred evenly, 1 part of potassium persulfate and 20 parts of water are mixed evenly in the first dropping device; 1.5 parts of 2-hydroxy-2-sulfinic acid Disodium salt, 0.8 parts of 3-mercaptopropionic acid and 20 parts of water are mix...

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Abstract

The invention relates to the field of concrete admixtures, in particular to a low-hydration-heat ester polycarboxylic acid water reducer and a preparation method thereof. The low-hydration-heat ester polycarboxylic acid water reducer is characterized by comprising an esterification product, an ester macromonomer, acrylic acid, unsaturated sulfonate 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 double bonds and borate radicals. The low-hydration-heat ester 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 a low-hydration thermal ester 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 amount of cementitious ...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F230/06C08F220/06C08F228/02C04B24/16C04B103/30
CPCC08F283/065C04B24/165C04B2103/302C08F230/065C08F220/06C08F228/02Y02W30/91
Inventor 张小芳林志君郭元强方云辉柯余良陈展华肖悦
Owner KZJ NEW MATERIALS GROUP CO LTD
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