A kind of solid anti-mud ultra-slow release polycarboxylate slump retaining agent and preparation method thereof

An ultra-slow-release polycarboxylate technology, which is applied in the field of building materials, can solve the problems of polycarboxylate slump-preserving agent loss, expensive equipment, and impact on slump-preserving effects, and achieve improved adsorption, good material adaptability, and retention The effect of slump

Active Publication Date: 2021-02-26
重庆建研科之杰新材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the disadvantages of the preparation of solid polycarboxylate slump-retaining agent are high preparation cost, expensive equipment and high energy consumption. Its slump protection effect is affected to a certain extent

Method used

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  • A kind of solid anti-mud ultra-slow release polycarboxylate slump retaining agent and preparation method thereof
  • A kind of solid anti-mud ultra-slow release polycarboxylate slump retaining agent and preparation method thereof
  • A kind of solid anti-mud ultra-slow release polycarboxylate slump retaining agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Preparation of unsaturated esterified small monomers:

[0038] 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.

[0039] (2) Melt polymerization

[0040] Add 80 parts by weight of unsaturated polyether P-1 and 20 parts by weight of 4-hydroxybutyl vinyl polyoxyethylene ether with a molecular weight of 500 into the reactor, raise the temperature to 85°C to make it in a molten state, and then once Add 1 part by weight of benzyltriphenylphosphine chloride, and stir evenly;

[0041] Mix 1 part b...

Embodiment 2

[0045] (1) Preparation of unsaturated esterified small monomers:

[0046]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 finished, it is lowered to room temperature, and the unsaturated esterified small monomer is obtained.

[0047] (2) Melt polymerization

[0048] Add 60 parts by weight of unsaturated polyether P-2 and 40 parts by weight of 4-hydroxybutyl vinyl polyoxyethylene ether with a molecular weight of 800 into the reactor, raise the temperature to 90°C to make it in a molten state, and then once 1 weight part tetrakis (triphenylphosphine) palladium was added, and ...

Embodiment 3

[0053] (1) Preparation of unsaturated esterified small monomers:

[0054] 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.

[0055] (2) Melt polymerization

[0056] Add 20 parts by weight of unsaturated polyether P-3 and 80 parts by weight of 4-hydroxybutyl vinyl polyoxyethylene ether with a molecular weight of 1500 into the reactor, raise the temperature to 80°C to make it in a molten state, and then once Add 2 parts by weight of tetrakis (triphenylphosphine) palladium, and stir evenly;

[0057] Mix 5 p...

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Abstract

The invention discloses a solid anti-mud ultra-slow-release polycarboxylic acid slump retaining agent and a preparation method thereof, comprising the following steps: (1) Esterification: methacrylic acid, saturated acid and 3-bis(2-hydroxyethyl ) Amino-2-hydroxypropanesulfonic acid reacts under the action of a catalyst to obtain unsaturated esterified small monomers; (2) melt polymerization: adding unsaturated polyether and 4-hydroxybutyl vinyl polyoxyethylene ether (3) solidified slices: after the reaction, use a mechanical pump to evacuate to remove the organic solvent, and then use a condensing microtome to slice to obtain white flake solid polycarboxylic acid Slump retaining agent. The slump-retaining agent prepared by the invention has good anti-mud effect and good slump retention ability for a long time.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a solid anti-mud 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. [000...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C08F212/14C08F216/14C08F220/38C08F220/06C08F220/28C08F230/02C08F283/06C04B24/16
CPCC04B24/163C04B24/165C08F212/14C08F283/065C08F220/281C08F216/1416C08F220/387C08F220/06C08F230/02
Inventor赖广兴方云辉孟祥杰林艳梅李格丽柯余良钟丽娜张小芳李卫黄小文
Owner重庆建研科之杰新材料有限公司