Polycarboxylic acid water reducing agent for improving rheological behavior of cement pastes and preparation method thereof

A technology of rheological properties and cement paste, applied in the field of polycarboxylate water reducer and its preparation to improve the rheological properties of cement paste, can solve the problems of reduced concrete anti-corrosion ability and reduced concrete strength, and achieve space stabilization effect Significant, rheologically improved, highly hydrophilic properties

Active Publication Date: 2019-04-16
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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  • Polycarboxylic acid water reducing agent for improving rheological behavior of cement pastes and preparation method thereof
  • Polycarboxylic acid water reducing agent for improving rheological behavior of cement pastes and preparation method thereof
  • Polycarboxylic acid water reducing agent for improving rheological behavior of cement pastes and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) transesterification reaction: 120.0gCH 3 (CH 2 ) 11 C 6 h 4 (OC 2 h 4 ) 20 OH, 25.0g methyl methacrylate, 0.90g polymerization inhibitor hydroquinone are mixed, under the protection of nitrogen, the temperature is raised to 40-60°C, then 2.15g catalyst 4-dimethylaminopyridine is added, and the temperature is raised to 80-90°C °C, keep the reaction temperature for 10 h, and cool down to room temperature after the reaction, to obtain the first mixture containing the esterification product and unreacted methyl methacrylate.

[0035] (2) Copolymerization reaction: Take 50.0g of the first mixture prepared in step (1), 80.0g of isobutylene alcohol polyoxyethylene ether with a molecular weight of 5000 and 330.0g of isobutenol polyoxyethylene ether with a molecular weight of 6000, 5.0g Hydroxyethyl methacrylate phosphate, 40.0g itaconic anhydride, 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 ves...

Embodiment 2

[0038] (1) transesterification reaction: 144.0gCH 3 (CH 2 ) 7 C 6 h 4 (OC 2 h 4 ) 11 Mix OH, 54.0g methyl acrylate, and 1.22g polymerization inhibitor phenothiazine. Under nitrogen protection, heat up to 40-60°C, then add 3.25g catalyst dibutyltin oxide, heat up to 90-100°C, and keep warm for reaction After 8 hours, the temperature was lowered to room temperature after the reaction, and the first mixture containing the esterified product and unreacted methyl acrylate was obtained.

[0039] (2) Copolymerization reaction: 30.0g of the first mixture prepared in step (1), 500.0g of isobutyl alcohol polyoxyethylene ether with a molecular weight of 6000, 10.0g of hydroxyethyl methacrylate phosphate, 12g of acrylic acid, 20.0g of Compound A(R 1 for -CH 2 , R 2 is H, n is 50) and 300.0g deionized water are added to the reaction vessel and mixed, ammonium persulfate aqueous solution (wherein ammonium persulfate 3.52g, water 30.00g), isopropanol aqueous solution (wherein isopr...

Embodiment 3

[0042] (1) transesterification reaction: 180.0gCH 3 (CH 2 ) 8 C 6 h 4 (OC 2 h 4 ) 15 Mix OH, 47.0g methyl methacrylate, and 3.25g polymerization inhibitor diphenylamine. Under the protection of nitrogen, heat up to 40-60°C, then add 4.34g catalyst isopropyl titanate, heat up to 90-100°C, and keep warm. After reacting for 6 hours, the temperature was lowered to room temperature after the reaction, and the first mixture containing the esterified product and unreacted methyl methacrylate was obtained.

[0043] (2) Copolymerization reaction: 40.0g of the first mixture prepared in step (1), 100.0g of isobutylene alcohol polyoxyethylene ether with a molecular weight of 5000 and 200g of isobutenol polyoxyethylene ether with a molecular weight of 4000, 15.0g of Ethyl methacrylate phosphate, 22.0g methacrylic acid, 10.0g compound A (R 1 for -CH 2 CH 2 , R 2 for CH 3 , n is 20) and 200.0g deionized water are added to the reaction vessel and mixed, hydrogen peroxide aqueous s...

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Abstract

The invention discloses a polycarboxylic acid water reducing agent for improving a rheological behavior of cement pastes. The polycarboxylic acid water reducing agent is prepared by a copolymerizationreaction of a first mixture, unsaturated polyether, hydroxyethyl methacrylate phosphate, unsaturated acid, a compound A, an initiator, a molecular weight regulator and water. The invention also discloses a preparation method of the polycarboxylic acid water reducing agent for improving the rheological behavior of cement pastes. The method comprises the following steps that an esterification product with a benzene ring is obtained by carrying out the ester exchange reaction between alkylphenol polyoxyethylene ether and unsaturated carboxylic ester; the esterification product is copolymerized with the unsaturated polyether, compound A and hydroxyethyl methacrylate phosphate to introduce a benzene ring, a phosphate group and an imide structure into branched chains of the polycarboxylic acidwater reducing agent, so that the rheological behavior of the concrete, and the stability, the fluidity and the like of the slurry can be improved.

Description

technical field [0001] The invention relates to the field of concrete materials in building materials, and relates to a polycarboxylate water reducer for improving the rheological properties of cement paste and a preparation method thereof. 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 requir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F290/06C08F230/02C08F222/04C08F220/14C08F220/06C08F222/02C04B24/26C04B103/30
CPCC04B24/246C04B2103/302C08F283/065C08F290/062C08F230/02C08F222/04C08F220/06C08F220/14C08F222/02
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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