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Highly-adaptive ultra-slow-release type polycarboxylate slump retaining admixture and preparation method thereof

An ultra-sustained release and adaptable technology, applied in the field of building materials, can solve the problems of not being able to fully meet the market demand, the improvement of the slump retention effect is not obvious, and the slump retention performance is insufficient. The effect of good collapse ability

Active Publication Date: 2019-03-29
GUANGDONG KEZHIJIE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the existing slump-preserving agents on the market can improve the slump-preserving effect of concrete in the application of concrete, but the slump-preserving performance is insufficient. Especially in the case of high mud content in the ground material, increasing the amount of slump-preserving agent can improve the slump-preserving effect Not obvious, showing poor adaptability and unable to fully meet market demand

Method used

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  • Highly-adaptive ultra-slow-release type polycarboxylate slump retaining admixture and preparation method thereof
  • Highly-adaptive ultra-slow-release type polycarboxylate slump retaining admixture and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Preparation of unsaturated esterified small monomers:

[0033] Under normal pressure, 41 parts of methacrylic acid, 71 parts of propionic acid, 130 parts of 3-bis(2-hydroxyethyl)amino-2-hydroxypropanesulfonic acid (DIPSO) were added to the reactor, and 0.25 1 part of titanium trichloride, 0.13 part of benzyl tributyl ammonium chloride and 13 parts of petroleum ether, carry out esterification reaction, the esterification reaction temperature is 100 ℃, and the reaction time is 3 hours, and after the reaction is completed, it is cooled to room temperature, that is Obtain unsaturated esterified small monomers.

[0034] (2) Copolymerization reaction:

[0035] At room temperature, in parts by weight, 1 part of diethyl vinyl phosphate, 3 parts of 2-[2-(furan-2-yl) vinyl]-4,6-bis(trichloromethyl)-1, 3,5 triazine and appropriate amount of water were placed in a four-necked flask and stirred.

[0036] Mix 100 parts of 4-hydroxybutyl vinyl ether polyoxyethylene ether with a...

Embodiment 2

[0041] (1) Preparation of unsaturated esterified small monomers:

[0042] Under normal pressure, 60 parts of methacrylic acid, 162 parts of butyric acid, 130 parts of 3-bis(2-hydroxyethyl)amino-2-hydroxypropanesulfonic acid (DIPSO) were added to the reactor, and 0.55 1 part of sodium p-toluenesulfonate, 0.45 part of tris(N-nitroso-N-phenylhydroxylamine) aluminum and 18 parts of cyclohexane, carry out esterification reaction, the esterification reaction temperature is 110 ℃, and the reaction time is 4 hours , After the reaction is completed, the temperature is lowered to room temperature, and the unsaturated esterified small monomer is obtained.

[0043] (2) Copolymerization reaction:

[0044]At room temperature, in parts by weight, 2 parts of diethyl vinyl phosphate, 2 parts of 2-(3,4-dimethoxy)-4,6-bis(trichloromethyl)-1,3,5 -Triazine and appropriate amount of water are placed in a four-necked flask and stirred.

[0045] Mix 100 parts of 4-hydroxybutyl vinyl ether polyoxye...

Embodiment 3

[0050] (1) Preparation of unsaturated esterified small monomers:

[0051] Under normal pressure, 90 parts of methacrylic acid, 85 parts of butyric acid, 130 parts of 3-bis(2-hydroxyethyl)amino-2-hydroxypropanesulfonic acid (DIPSO) were added to the reactor, and 0.6 1 part of titanium trichloride, 0.35 part of benzyltributylammonium chloride and 40 parts of sherwood oil, carry out esterification reaction, the esterification reaction temperature is 120 ℃, and the reaction time is 5 hours, after the reaction finishes, it is down to room temperature, namely Obtain unsaturated esterified small monomers.

[0052] (2) Copolymerization reaction:

[0053] At room temperature, in parts by weight, 3 parts of diethyl vinyl phosphate, 5 parts of diphenyliodonium trifluoromethanesulfonate and appropriate amount of water were placed in a four-necked flask and stirred.

[0054] Mix 100 parts of 4-hydroxybutyl vinyl ether polyoxyethylene ether with a weight average molecular weight of 3000 a...

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Abstract

A highly-adaptive ultra-slow-release type polycarboxylate slump retaining admixture and a preparation method thereof are disclosed. The method includes an esterification step, namely a step of reacting methacrylic acid, a saturated acid and 3-bis(2-hydroxyethyl)amino-2-hydroxy propanesulfonic acid under the existence of a catalyst to obtain an unsaturated esterified small monomer; (2) subjecting 4-butanediol vinyl ether polyoxyethylene ether as a macromonomer to copolymerization under the action of a composite photoinitiator; and (3) neutralizing the obtained copolymerization product with a sodium hydroxide solution to obtain the slump retaining admixture. The prepared slump retaining admixture has good slump retaining capability at high temperature for long time, has certain anti-mud effects and has good adaptability to mud-containing ground materials.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a highly adaptable ultra-slow-release polycarboxylate slump retaining agent and a preparation method thereof. Background technique [0002] As the third generation of new high-performance water reducer, polycarboxylate water reducer has the advantages of high water reducing rate, designable molecular structure, and small air-entrained volume. It is very suitable for preparing high-strength and high-performance concrete. Recognized, it has been widely used in nuclear power, water conservancy, bridges, tunnels and other large-scale infrastructure and other large-scale projects. However, due to the influence of factors such as temperature changes, cement changes, and high mud content in sand and stone materials, the polycarboxylate superplasticizer has the problem of excessive slump loss in application, which affects engineering construction and quality. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/20C08F230/02C08F2/48C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F2/48C08F220/20C08F230/02C08F283/065C08F220/06
Inventor 赖广兴方云辉谢木和赖华珍李格丽柯余良钟丽娜张小芳郭元强林添兴
Owner GUANGDONG KEZHIJIE NEW MATERIALS
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