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A kind of phenolic modified mud resistant polycarboxylate water reducer and preparation method thereof

A phenolic modification and polycarboxylic acid technology, which is applied in the field of concrete admixtures, can solve the problems of difficult preparation of polyethylene glycol derivatives and inappropriate application of water reducing agents in the market, achieve good steric hindrance effect, improve resistance to Adsorption capacity, reducing the effect of intercalation adsorption

Active Publication Date: 2022-04-19
CHINA WEST CONSTR ACAD OF BUILDING MATERIALS CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water reducer has a good slump-preserving effect on mud-containing sand and gravel, but it is difficult to obtain polyethylene glycol derivatives substituted by one end of the reaction raw material, which is not suitable for the current domestic water reducer application market

Method used

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  • A kind of phenolic modified mud resistant polycarboxylate water reducer and preparation method thereof
  • A kind of phenolic modified mud resistant polycarboxylate water reducer and preparation method thereof
  • A kind of phenolic modified mud resistant polycarboxylate water reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A preparation method of a phenolic modified mud-resistant polycarboxylate water reducer, the specific steps are as follows:

[0039] S1, the preparation of phenyl unsaturated ester:

[0040] Add 0.3 mol itaconic acid, 0.3 mol phenyl glycidyl ether, 0.42 g sulfuric acid, 0.25 g 2-tert-butylhydroquinone and continuously feed N 2 In a reaction vessel, keep stirring, control the reaction temperature at 80°C, and react for 5 hours to obtain the phenyl unsaturated ester.

[0041] S2, 68g of methacrylic acid, 58g of phenyl unsaturated ester, 25g of deionized water are prepared into material A, and 1.5g of mercaptoethanol, 0.42g of saffron, and 20g of deionized water are prepared into material B;

[0042] S3, take 2.0g of potassium persulfate and 20g of deionized water and add and continuously feed N 2 In the reaction container, stir at room temperature until the mixture is uniform, as the bottom material;

[0043] S4, continuous access to N 2 , control the temperature in t...

Embodiment 2

[0046] A preparation method of a phenolic modified mud-resistant polycarboxylate water reducer, the specific steps are as follows:

[0047] S1, the preparation of phenyl unsaturated ester:

[0048] Add 0.4mol acrylic acid, 0.4mol phenyl glycidyl ether, 0.9g p-toluenesulfonic acid, 0.42g p-hydroxyanisole and continuously feed N 2 In a reaction vessel, keep stirring, control the reaction temperature at 90°C, and react for 6 hours to obtain the phenyl unsaturated ester.

[0049] S2, 60g methacrylic acid, 45g phenyl unsaturated ester, 20g deionized water are prepared into material A, 1.1g thioglycolic acid, 0.54g vitamin C, 20g deionized water are prepared into material B;

[0050] S3, take 2.0g of hydrogen peroxide and 20g of deionized water and add it into N continuously 2 In the reaction container, stir at room temperature until the mixture is uniform, as the bottom material;

[0051] S4. Control the temperature in the reaction vessel to 40°C, drop materials A and B into the...

Embodiment 3

[0054] A preparation method of a phenolic modified mud-resistant polycarboxylate water reducer, the specific steps are as follows:

[0055] S1, the preparation of phenyl unsaturated ester:

[0056] Add 0.32mol methacrylic acid, 0.3mol phenyl glycidyl ether, 1g tetrabutylammonium bromide, 0.54g hydroquinone and continuously feed N 2 In a reaction vessel, keep stirring, control the reaction temperature at 80°C, and react for 7 hours to obtain the phenyl unsaturated ester.

[0057] S2, 35g maleic anhydride, 35g phenyl unsaturated ester, 45g deionized water are prepared into material A, 1.0g sodium hypophosphite, 0.4g vitamin C, 0.1g ferrous sulfate, 20g deionized water are prepared into Material B.

[0058] S3, take 2.0g of ammonium persulfate and 20g of deionized water and add and continuously feed N 2 In the reaction vessel, stir at room temperature until the mixture is uniform, as the base material.

[0059] S4. Control the temperature in the reaction vessel to 30°C, add m...

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Abstract

The invention discloses a phenolic modified mud-resistant polycarboxylic acid water reducer, which is composed of unsaturated carboxylic acid A, phenyl unsaturated ester, phenols and aldehydes in deionized water for free radical polymerization and polycondensation Prepared by reaction; the mass percentages of each raw material component are as follows: 35-85% of unsaturated carboxylic acid A, 15-40% of phenyl unsaturated ester, 1-4% of phenols, 0.5-4% of aldehydes, 0.05% of catalyst A ~0.3%, initiator 1~3%, reducing agent 0.2~1%, chain transfer agent 0.5~2.0%. Phenyl unsaturated ester is prepared by ring-opening reaction of unsaturated carboxylic acid B and phenyl glycidyl ether under the conditions of catalyst B and polymerization inhibitor. The phenols are one of phenol, hydroquinone, resorcinol, catechol or phloroglucinol. The aldehydes are one of formaldehyde, paraformaldehyde, acetaldehyde, benzaldehyde, and terephthalaldehyde. The water reducer of the invention can limit the adsorption of clay to the polycarboxylate water reducer, and can significantly reduce the amount of admixture and improve the slump retention performance of the concrete when used in machine sand concrete containing mud.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a phenolic modified mud-resistant polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer (PCE), as the third generation of high-performance superplasticizer, has the characteristics of high water reducing rate and good slump retention performance. With the rapid development of my country's construction industry, the consumption of construction sand and gravel is huge, and high-quality sand and gravel resources are scarce. The problem of mud in sand and gravel has become an urgent problem to be solved in the concrete industry. At present, the clay contained in construction sand varies according to the origin, but it is mainly a type of layered structure of aluminosilicate minerals. A large number of engineering examples and studies have shown that compared with high-efficiency water-reducers such ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/06C08F222/06C08F222/02C08F220/30C08F8/00C08G8/28C04B24/26C04B24/30C04B103/30
CPCC08F220/06C08F222/06C08F222/02C08F8/00C08G8/28C04B24/2641C04B24/302C04B2103/302C08F220/302
Inventor 高育欣杨文曾超王福涛王军刘明毕耀刘其彬闫松龄罗杰
Owner CHINA WEST CONSTR ACAD OF BUILDING MATERIALS CO LTD
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