Super-slowly-released polycarboxylic acid slump inhibitor and preparation method thereof

An ultra-slow-release, polycarboxylic acid technology, applied in the field of building materials, can solve problems such as inability to fully meet market demand, cost increase, and insufficient slump performance, and achieve low cost, easy operation, and good slump performance.

Active Publication Date: 2019-03-08
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-retaining agents in the market can improve the effect of concrete slump-retaining in concrete applications, but the slump-retaining performance is insufficient. Increasing the amount of slump-retaining agents will greatly increase the cost, which cannot fully meet the market demand.

Method used

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  • Super-slowly-released polycarboxylic acid slump inhibitor and preparation method thereof
  • Super-slowly-released polycarboxylic acid slump inhibitor 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, 100 parts of isopentenol polyoxyethylene ether with a weight average molecular weight of 2000 and 0.5 parts of dimethyl vinyl phosphate were dissolved in deionized water as a primer, and 1 part of acrylic acid was used to adjust the pH of the primer to 5- 6.

[0036] Dissolve 2 parts of cumyl...

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, 100 parts of isopentenol polyoxyethylene polyoxypropylene ether with a weight average molecular weight of 2400 and 1.0 parts of dimethyl vinyl phosphate were dissolved in deionized water as a primer, and 1.5 parts of methacrylic acid was used to adjust the primer. p...

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, 100 parts of methallyl alcohol polyoxyethylene ether with a weight average molecular weight of 3000 and 1.5 parts of dimethyl vinyl phosphate were dissolved in deionized water as a primer, and 2.0 parts of acrylic acid was used to adjust the pH of the primer to 5 ~6.

[0054] 3 parts of 2-hydroxyl-2-methyl-1-[4...

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Abstract

The invention discloses a super-slowly-released polycarboxylic acid slump inhibitor and a preparation method thereof. The preparation method includes the steps: (1) esterification: performing reactionon methacrylic acid, saturated acid and 3-bi(2-ethoxyl) amino-2-hydroxypropyl sulfonic acid under the action of a catalyst to prepare an unsaturated esterification micro-monomer; (2) placing unsaturated polyether, unsaturated phosphate and unsaturated monocarboxylic acid into a backing material, and dripping a photo-initiator (solution A) dissolved in deionized water, a chain transfer agent, theunsaturated monocarboxylic acid, the unsaturated esterification micro-monomer and unsaturated carboxylic ester into the backing material to perform reaction polymerization; (3) adding pH (potential ofhydrogen) conditioning solution after heat preservation to neutralize mixture to obtain the slump inhibitor. The prepared slump inhibitor has good slump retention ability at high temperature for a long time.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to an 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. [0003] To solve th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/38C08F220/20C04B24/16C04B103/30
CPCC04B24/165C04B2103/302C08F283/065C08F220/387
Inventor 赖广兴方云辉谢木和赖华珍林艳梅李格丽柯余良黄忠钟丽娜张小芳
Owner GUANGDONG KEZHIJIE NEW MATERIALS
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