Super-early-strength polycarboxylate-type water reducing agent as well as preparation method and application thereof

A polycarboxylate-based, ultra-early-strength type technology, applied in the field of polycarboxylate-based water reducers, can solve problems such as slow strength development, achieve high early strength, good slump retention, and promote the effect of cement hydration reaction

Inactive Publication Date: 2021-04-20
SHANGHAI DONGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of this application is to overcome the defects of the existing polycarboxylate water reducer in delaying cement hydration and slow development of early strength, and provide a super early strength polycarboxylate water reducer

Method used

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  • Super-early-strength polycarboxylate-type water reducing agent as well as preparation method and application thereof
  • Super-early-strength polycarboxylate-type water reducing agent as well as preparation method and application thereof
  • Super-early-strength polycarboxylate-type water reducing agent as well as preparation method and application thereof

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Experimental program
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preparation example Construction

[0048] In the first aspect, the present application provides a method for preparing a super-early-strength polycarboxylate water reducer, the preparation method comprising: in the presence of an oxidizing agent, a reducing agent and a chain transfer agent, including unsaturated polyoxygen Ethylene polyoxypropylene block amine ether, polyethylene glycol monomethyl ether ester, unsaturated monocarboxylic acid, amino unsaturated ester, N,N-dimethylacrylamide, N-isopropylacrylamide and 2 -The monomer mixture of acrylamide-2-methylpropanesulfonic acid undergoes free radical polymerization reaction, and then adds liquid caustic soda for neutralization, and then adds thiocyanate to obtain the super-early-strength polycarboxylate water-reducing agent.

[0049] In one embodiment, based on parts by weight, the super early strength polycarboxylate water reducer is made of the following raw material components: 100 parts of unsaturated polyoxyethylene polyoxypropylene block amine Ether, ...

Embodiment 1

[0081] A preparation method of super-early-strength polycarboxylate water-reducer, comprising the steps of:

[0082] (1) Preparation before polymerization: 100 parts of ethylene glycol polyoxyethylene polyoxypropylene block polyether with a number average molecular weight of 4000, 20 parts of polyethylene glycol monomethyl ether esterified with a number average molecular weight of 4000 and 120 parts of water parts by weight, put it into a reaction container, heat up to 30°C, stir fully to completely dissolve the solid and mix evenly to obtain the first mixed solution;

[0083] Preparation of solution A: Accurately weigh 14 parts by weight of acrylic acid, 2.5 parts by weight of amino unsaturated ester, 0.5 parts by weight of mercaptopropionic acid and 15 parts by weight of water, stir and mix evenly and pump into high tank A for dripping;

[0084] Preparation of solution B: Accurately weigh 0.3 parts by weight of hanging white block (alias: sodium formaldehyde sulfoxylate, model...

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Abstract

The invention relates to a super-early-strength polycarboxylate-type water reducing agent. The super-early-strength polycarboxylate-type water reducing agent is prepared from the following raw material components: unsaturated polyoxyethylene polyoxypropylene block amine ether, polyethylene glycol monomethyl ether ester, unsaturated monocarboxylic acid, amino unsaturated acid ester, acrylamide monomers, an alkali metal hydroxide solution, a thiocyanate early strength agent, an oxidizing agent, a reducing agent, a chain transfer agent and water. Wherein the polyethylene glycol monomethyl ether ester is an esterification product obtained by reacting polyethylene glycol monomethyl ether with unsaturated monocarboxylic acid under an acidic condition; wherein the amino unsaturated acid ester is an esterification product of unsaturated monocarboxylic acid and N, N-dialkylethanolamine. The invention further relates to a preparation method and application of the super-early-strength polycarboxylate-type water reducing agent. The super-early-strength polycarboxylate-type water reducing agent promotes hydration of cement, does not contain any active reinforcing admixture, and has remarkable economic benefits, social benefits and environmental benefits; and the preparation process is simple and convenient to operate.

Description

technical field [0001] The present application relates to the technical field of polycarboxylate water reducer, in particular to a super early strength polycarboxylate water reducer, a method for preparing the super early strength polycarboxylate water reducer, and the super early strength polycarboxylate water reducer. Application of early-strength polycarboxylate water reducer in the preparation of concrete prefabricated components. Background technique [0002] Polycarboxylate superplasticizer is the third generation of high-performance concrete admixture, with high water reducing rate, excellent slump retention performance, low dosage, good adaptability, low bleeding rate, low chloride ion content and alkali content, green and environmental protection It is very suitable for preparing high-performance and high-strength concrete with good durability, and has been widely used in various concrete projects. However, the concrete cement prepared by ordinary polycarboxylate s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F290/06C08F220/34C08F220/06C08F220/54C08F220/58C04B24/16C04B103/30
Inventor 徐军季锦卫罗琼翟立杰潘环宇章鹏飞
Owner SHANGHAI DONGDA CHEM
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