A kind of preparation method of ether-ester copolymerization type polycarboxylate water reducer with improved rheological properties

A technology of rheological characteristics and copolymerization, which is applied in the field of ether ester copolymerization polycarboxylate water reducer, can solve the problems of reduced concrete anticorrosion ability and concrete strength, and achieves difficult bleeding and segregation, strong flow retention performance, and improved The effect of dispersion

Active Publication Date: 2021-12-07
KZJ NEW MATERIALS GROUP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, although the addition of traditional polycarboxylate-based water reducers to high-strength or high-performance concrete can reduce the friction between particles in the concrete, it will also have many negative effects, such as reduced concrete strength, reduced concrete anti-corrosion ability, etc.

Method used

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  • A kind of preparation method of ether-ester copolymerization type polycarboxylate water reducer with improved rheological properties
  • A kind of preparation method of ether-ester copolymerization type polycarboxylate water reducer with improved rheological properties
  • A kind of preparation method of ether-ester copolymerization type polycarboxylate water reducer with improved rheological properties

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Esterification reaction: 200.0g molecular weight is the methoxypolyethylene glycol of 4000, 52.2g methyl acrylate, 80.0gCH 3 (CH 2 ) 11 C 6 h 4 (OC 2 h 4 ) 20 Mix OH and 1.25g of polymerization inhibitor phenothiazine hydroquinone, under the protection of nitrogen, heat up to 40-60°C, then add 3.15g of catalyst 4-dimethylaminopyridine, heat up to 80-90°C, and react at constant temperature for 8h , down to room temperature after the reaction, to obtain the first mixture containing the esterification product and unreacted unsaturated acid and unsaturated carboxylic acid ester.

[0030] (2) Copolymerization reaction: get the first mixture that 100.0g step (1) makes, 200.0g molecular weight is the isopentenol polyoxyethylene ether of 5000, 16.0g methacrylic acid, 30.0g compound A (R 1 for -CH 2 , R 2 for CH 3 , n is 100) and 200.0g of deionized water are added to the reaction vessel and mixed, hydrogen peroxide aqueous solution (wherein hydrogen peroxide is 3....

Embodiment 2

[0033] (1) Transesterification reaction: 160.0g of methoxypolyethylene glycol with molecular weight of 3000, 65.9g of methyl methacrylate, 80.0g of CH 3 (CH 2 ) 7 C 6 h 4 (OC 2 h 4 ) 11 Mix OH and 1.02g of polymerization inhibitor hydroquinone, under the protection of nitrogen, heat up to 40-60°C, then add 3.25g of catalyst dibutyltin oxide, heat up to 90-100°C, keep warm for 6 hours, after the reaction Cool down to room temperature to obtain a first mixture of esterified product and unreacted methyl acrylate.

[0034](2) Copolymerization reaction: 200.0g of the first mixture prepared in step (1), 100.0g of isobutyl alcohol polyoxyethylene ether with a molecular weight of 4000, 14.4g of acrylic acid, 10.0g of compound A (R 1 for -CH 2 , R 2 is H, n is 20) and 300.0g deionized water are added to the reaction vessel and mixed, ammonium persulfate aqueous solution (wherein ammonium persulfate 3.15g, water 30.00g), dodecanethiol aqueous solution (wherein isopropanol 1.80g...

Embodiment 3

[0037] (1) Transesterification reaction: 100.0g of methoxypolyethylene glycol with a molecular weight of 1000, 57.0g of methyl methacrylate, 60.0g of CH 3 (CH 2 ) 8 C 6 h 4 (OC 2 h 4 ) 15 OH and 0.80g polymerization inhibitor diphenylamine were mixed, and under the protection of nitrogen, the temperature was raised to 40-60°C, and then 3.54g of catalyst sodium carbonate was added, the temperature was raised to 90-100°C, and the reaction was kept for 6 hours. After the reaction was completed, it was lowered to room temperature to obtain A first mixture of esterified product and unreacted methyl methacrylate.

[0038] (2) Copolymerization reaction: the first mixture prepared by 150.0g step (1), 150.0g molecular weight is 6000 isobutenol polyoxyethylene ether, 14.7g maleic anhydride, 20.0g compound A (R 1 for -CH 2 CH 2 , R 2 for CH 3 , n is 50) and 200.0g deionized water are added to the reaction vessel and mixed, hydrogen peroxide aqueous solution (wherein hydrogen p...

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Abstract

The invention discloses a method for preparing an ether-ester copolymerized polycarboxylate water-reducer for improving rheological properties. The raw materials for preparing the water-reducer include the first mixture, unsaturated polyether with a molecular weight of 4000-6000, unsaturated polyether Saturated acid, compound A, initiator, molecular weight regulator and deionized water, the first mixture is composed of methoxypolyethylene glycol with molecular weight of 1000-4000, alkylphenol polyoxyethylene ether, unsaturated carboxylic acid The raw materials of ester and polymerization inhibitor are obtained through transesterification. The present invention introduces benzene ring and imide structure. The introduction of benzene ring structure can effectively improve the adsorption efficiency and the thickness of the adsorption layer of polymer molecules on the surface of cement particles, making the space stabilization effect of the water reducing agent more significant; the imide structure Among them, it can improve the adsorption on the surface of cement particles, increase the electrostatic repulsion between cement particles, and improve the stability and fluidity of cement paste.

Description

technical field [0001] The invention relates to the field of concrete materials in building materials, in particular to an ether-ester copolymerized polycarboxylate water reducer for improving the rheological properties of cement paste. Background technique [0002] In the field of concrete materials, water reducing agent is an admixture of concrete mixture, which is used to improve its rheological properties, and has been widely used at present. The application of water reducing agent can effectively reduce the water-cement ratio of concrete, improve the pore structure and compactness of concrete, and improve the strength and durability of concrete. This has important positive significance in improving project quality, service life, reducing costs, and reducing environmental pollution. . [0003] With the vigorous development of my country's construction industry, important buildings with high-strength, high-performance concrete structures and special functional requiremen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F4/40C08F2/38C08G65/332C04B24/26C04B103/30
CPCC04B24/2694C04B2103/006C04B2103/302C08F283/06C08F283/065C08G65/3322C08F220/06
Inventor 赖华珍方云辉邵幼哲吴传灯郭元强林添兴麻秀星温庆如
Owner KZJ NEW MATERIALS GROUP CO LTD
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