Short side chain anti-sludge polycarboxylic acid water reducer and preparation method thereof

A clay-resistant, polycarboxylic acid technology, applied in the field of concrete admixtures, can solve the problems of increasing the adsorption of clay minerals, decreasing the water-reducing ability, and requiring separation and purification, so as to ensure the water-reduction rate, improve the tolerance, and make up for the The effect of reducing the steric repulsion

Active Publication Date: 2019-05-10
湖北筑选新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the phosphoric acid monomer introduced in this method makes it difficult to control the molecular weight in the polymerization reaction, and the introduction of a large number of functional monomers greatly reduces the water reducing capacity
[0007] The above-mentioned patents have synthesized anti-mud polycarboxylate superplasticizers through different design ideas and methods, but they all use conventional polyether or modified polyether monomers. On the one hand, longer side chains can provide more excellent steric repulsion However, on the other hand, it will increase the interlayer adsorption of clay minerals to polycarboxylate, which improves the water-reducing and dispersing ability and is not conducive to the design of mud-resistant performance.
However, the modification of the side chain structure has an adverse effect on the reactivity of the polyether monomer, which is unfavorable for improving the conversion rate of the polymerization reaction.
In addition, the above-mentioned patents all have more or less problems such as complex reaction process and need for separation and purification.

Method used

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  • Short side chain anti-sludge polycarboxylic acid water reducer and preparation method thereof
  • Short side chain anti-sludge polycarboxylic acid water reducer and preparation method thereof
  • Short side chain anti-sludge polycarboxylic acid water reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Add 100 parts of 4-hydroxybutyl vinyl ether, 60 parts of fumaric acid, 60 parts of monomethyl maleate and 20 parts of acryloyl ethyl sulfobetaine and some deionized water into the reaction vessel, Stir well at 30°C. Start to add 2 parts of hydrogen peroxide, 0.5 parts of L-ascorbic acid and 0.5 parts of thioglycolic acid solution dropwise at a constant speed for 3 hours. After the dropwise addition, add NaOH solution to adjust the pH to 5, add some deionized water to adjust the solid content of the reaction solution to 40%, and obtain the anti-mud type mother liquid UC-CT1.

[0044] The preparation method of the maleic acid monomethyl ester is as follows: add anhydrous maleic diol in the reaction vessel, wait for the temperature to rise to 50-60°C, add maleic anhydride to react for 3 hours, and distill the reaction product under reduced pressure Remove the unreacted alcohol to obtain monomethyl maleate; wherein the ratio of maleic anhydride to maleic diol is 1:1.2.

Embodiment 2

[0046] Add 100 parts of ethylene glycol butyl vinyl ether, 75 parts of maleic anhydride, 52 parts of monobutyl maleate and 25 parts of acryloyl ethyl sulfobetaine and some deionized water into the reaction vessel, Stir well at 40°C. Start to add 2 parts of ammonium persulfate, L-ascorbic acid and mercaptopropionic acid solution dropwise at a constant speed, and the dropping time is 2.5 hours. After the dropwise addition, add some NaOH solution to adjust the pH to 5.5, add some deionized water to adjust the solid content of the reaction solution to 40%, and obtain the mud-resistant mother solution UC-CT2.

[0047] The preparation method of the monobutyl maleate is as follows: add anhydrous maleic diol in the reaction vessel, wait for the temperature to rise to 50-60° C., add maleic anhydride to react for 3 hours, and distill the reaction product under reduced pressure The unreacted alcohol is removed to obtain monobutyl maleate; wherein the ratio of maleic anhydride to maleic ...

Embodiment 3

[0049] Add 100 parts of diethylene glycol monovinyl ether, 90 parts of itaconic acid, 45 parts of monoethyl itaconate and 30 parts of methacryloyl ethyl sulfobetaine and some deionized water into the reaction vessel, Stir well at 40°C. Start to add ammonium persulfate, mohr's salt and thioglycolic acid solution dropwise at a constant speed, and the dropping time is 2h. After the dropwise addition is completed, add some NaOH solution to adjust the pH to 6, add some deionized water to adjust the solid content of the reaction solution to 40%, and obtain the mud-resistant mother solution UC-CT3.

[0050] The preparation process of the monoethyl itaconate is: itaconic acid, anhydrous C 1-4 Alcohol and benzoyl chloride are added to the reaction vessel and mixed, heated and stirred to a temperature of 70°C, and the reaction is continued for 3 hours, and the reaction product is distilled off under reduced pressure to remove excess C 1-4 Alcohol, then add the recrystallization solven...

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Abstract

The invention discloses a short side chain anti-sludge polycarboxylic acid water reducer and a preparation method thereof. Small molecule unsaturated vinyl ether, unsaturated polyacid / unsaturated polybasic anhydride, unsaturated polyacid monoalkyl ester and sulfonic-acid-group-containing unsaturated betaine are polymerized in water solution to form the short side chain anti-sludge polycarboxylic acid water reducer. The short side chain small molecule unsaturated vinyl ether replaces a traditional polyether macromonomer, as a side chain structure is shorter, a polycarboxylic acid structure hashigher electric charge density, on one hand, spatial repulsive force reduction caused by a short side chain can be remedied, on the other hand, intercalation adsorption of the side chain in a clay interlayer structure can be reduced, and the clay mineral tolerance of the polycarboxylic acid water reducer is improved.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a short side chain mud-resistant polycarboxylate water reducer and a preparation method thereof. Background technique [0002] In recent years, due to the large-scale development of infrastructure projects, high-quality sand and gravel resources are gradually being exhausted, and inferior materials, such as sand and gravel resources with high mud content, often appear in the process of water reduction with polycarboxylic acid. In order to solve the problem of adaptability of clay minerals and polycarboxylate superplasticizers, researchers at home and abroad have conducted a lot of research. [0003] The patent US 2017 / 028475 Clay insensitive concrete superplasticizer discloses a mud-resistant polycarboxylate superplasticizer, which is an SMA copolymer prepared by copolymerization of styrene, dicarboxylic acid ring-opened maleic anhydride, and ring-opened m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F216/14C08F222/02C08F222/26C08F220/38C08F222/06C08F222/16C08F222/04C04B24/16C04B103/30
Inventor 董耀武代柱端陈健周晓阳
Owner 湖北筑选新材料有限公司
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