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Long-acting slow-release polycarboxylic acid slump retaining agent and preparation method thereof

A slow-release polycarboxylic acid and slump-retaining agent technology, applied in the field of building materials, can solve the problems of long transportation time of concrete mixer trucks, unable to fully meet market demand, insufficient slump-preserving performance, etc., and achieve good effect and slump-preserving performance. The effect of improving and good adsorption capacity

Active Publication Date: 2019-03-15
科之杰新材料集团河南有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the existing slump-retaining agents on the market can improve the effect of concrete slump-retaining in concrete applications, their slump-retaining performance is insufficient. Increasing the amount of slump-retaining agents will greatly increase the cost, which cannot fully meet the market demand. With the aggravation of congestion, the transportation time of concrete mixer trucks is getting longer and longer, so it is particularly important to develop a long-term ultra-slow release and high slump retention agent

Method used

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  • Long-acting slow-release polycarboxylic acid slump retaining agent and preparation method thereof
  • Long-acting slow-release polycarboxylic acid slump retaining agent and preparation method thereof
  • Long-acting slow-release polycarboxylic acid slump retaining agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Preparation of unsaturated esterified small monomers:

[0039] 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 copper chloride, 0.13 part of benzyltributylammonium chloride and 13 parts of chloroform, carry out esterification reaction, the esterification reaction temperature is 100 ℃, and the reaction time is 3 hours, after the reaction is finished, it is down to room temperature, that is to say, Saturated esterified small monomers.

[0040] (2) Copolymerization reaction:

[0041] At room temperature, 100 parts of cumenyl polyoxyethylene ether P-1, 1 part of ethyl 3-butenyl phosphocarboxylate and 0.5 part of azodiimidazolinyl propane dihydrochloride were dissolved in an appropriate amount of deionized water as For the primer, adjust the pH of the primer to 5-6 with 1 part of acrylic acid.

[0042] Dissolve 3 ...

Embodiment 2

[0047] (1) Preparation of unsaturated esterified small monomers:

[0048] 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 Part of zinc chloride, 0.45 part of three (N-nitroso-N-phenylhydroxylamine) aluminum and 18 parts of carbon tetrachloride, 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.

[0049] (2) Copolymerization reaction:

[0050] At room temperature, 100 parts of cumenyl polyoxyethylene ether P-2, 2 parts of ethyl 3-butenyl phosphocarboxylate and 1.5 parts of azodiimidazolinyl propane dihydrochloride were dissolved in an appropriate amount of deionized water as For the primer, use 2 parts of acrylic acid to adjust the...

Embodiment 3

[0056] (1) Preparation of unsaturated esterified small monomers:

[0057] 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 copper chloride, 0.35 part of benzyltributylammonium chloride and 40 parts of chloroform, carry out esterification reaction, the esterification reaction temperature is 120 ℃, and the reaction time is 5 hours, and after the reaction is finished, it is down to room temperature, that is, no Saturated esterified small monomers.

[0058] (2) Copolymerization reaction:

[0059] At room temperature, 100 parts of cumenyl polyoxyethylene ether P-3, 3 parts of ethyl 3-butenyl phosphocarboxylate and 1 part of azodiimidazolinyl propane dihydrochloride were dissolved in an appropriate amount of deionized water as For the primer, adjust the pH of the primer to 5-6 with 3 parts of methacrylic acid.

[0060] Dissolve 2...

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Abstract

The invention discloses a long-acting slow-release polycarboxylic acid slump retaining agent and a preparation method thereof. The preparation method comprises the following steps: firstly, esterifying: reacting methacrylic acid, saturated acid and 3-bis(2-ethoxy)-amino-2-hydroxypropionic acid under the action of a catalyst to obtain an unsaturated esterified small monomer; putting cumenyl polyoxyethylene, unsaturated monocarboxylic acid, 3-butylenyl phosphonate and the like into a backing material, and respectively dropwise adding a photoinitiator (a first solution) dissolved into the deionized water, a chain transfer agent, the unsaturated monocarboxylic acid, the unsaturated esterified small monomer and unsaturated carboxylic acid ester (a second solution) into the backing material forreaction and polymerization; thirdly, adding pH regulating liquid for neutralizing after thermal insulation is finished, thus obtaining a finished product. The slump retaining agent prepared with thepreparation method disclosed by the invention has good slump retention ability in a long time.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a long-acting slow-release polycarboxylic acid 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/14C08F220/28C08F220/06C08F220/38C08F230/02C08F2/48C08F2/10C08F2/38C08F283/06C04B24/16
CPCC04B24/163C04B24/165C08F212/14C08F283/065C08F220/387C08F220/281C08F220/06C08F230/02C08F2/38C08F2/48C08F2/10
Inventor 赖广兴方云辉温庆如赖华珍李格丽柯余良钟丽娜张小芳杜可禄张秉旺
Owner 科之杰新材料集团河南有限公司
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