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Ester-ether copolymerization low-bleeding type polycarboxylate superplasticizer and preparation method thereof

A technology of ester ether copolymerization and polycarboxylic acid, which is applied in the field of construction admixtures, can solve the problems of high water retention polycarboxylate superplasticizer, low cost performance, complex reaction conditions and reaction process, low reaction conversion rate, etc., and achieve good concrete retention Slump effect, good cement adaptability and material adaptability, and the effect of improving the dispersion effect

Active Publication Date: 2021-04-06
ZHEJIANG KZJ NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method hopes to change the water retention performance of the product by introducing organosilicon monomers. Since organosilicon monomers are generally poor in water solubility, the reaction conditions and reaction process are complicated, and the reaction conversion rate is low. The obtained high water retention polycarboxylate superplasticizer lower cost performance

Method used

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  • Ester-ether copolymerization low-bleeding type polycarboxylate superplasticizer and preparation method thereof
  • Ester-ether copolymerization low-bleeding type polycarboxylate superplasticizer and preparation method thereof
  • Ester-ether copolymerization low-bleeding type polycarboxylate superplasticizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Configure the first mixed solution and the second mixed solution respectively, and the ratio is as follows:

[0044] The first mixed solution: methacrylic acid (15 parts) + ethylene cyclohexanol (3 parts) + 1,2-dimethyl-3-(1-methylvinyl) cyclopentanol (6 parts) + water (30 share)

[0045] The second mixed solution: thioglycolic acid (1.2 parts)+L~ascorbic acid (0.2 parts)+sodium hypophosphite (0.5 parts)+water (40 parts)

[0046] (1) Mix 30 parts of polyethylene glycol monomethyl ether, 8 parts of maleic anhydride, 0.5 parts of concentrated sulfuric acid, and 0.1 part of p-hydroxyanisole, heat up to 160°C-180°C, stir and vacuumize at the same time to make it React under a vacuum of 0.3MPa-0.5MPa for 5-7 hours. After the reaction is completed, add 160 parts of deionized water, cool down to below 60°C, and obtain an aqueous esterified monomer solution;

[0047] (2) Add 145 parts of vinyl polyoxyethylene ethers to the above-mentioned aqueous esterified monomer solution f...

Embodiment 2

[0051] Configure the first mixed solution and the second mixed solution respectively, and the ratio is as follows:

[0052] The first mixed solution: methacrylic acid (12 parts) + ethylene cyclohexanol (6 parts) + 1,2-dimethyl-3-(1-methylvinyl) cyclopentanol (7 parts) + water (30 share)

[0053] The second mixed solution: thioglycolic acid (1.2 parts)+L~ascorbic acid (0.2 parts)+sodium hypophosphite (0.5 parts)+water (40 parts)

[0054] (1) Mix 30 parts of polyethylene glycol monomethyl ether, 8 parts of maleic anhydride, 0.5 parts of concentrated sulfuric acid, and 0.1 part of p-hydroxyanisole, heat up to 160°C-180°C, stir and vacuumize at the same time to make it React under a vacuum of 0.3MPa-0.5MPa for 5-7 hours. After the reaction is completed, add 160 parts of deionized water, cool down to below 60°C, and obtain an aqueous esterified monomer solution;

[0055] (2) Add 145 parts of vinyl polyoxyethylene ethers to the above-mentioned aqueous esterified monomer solution f...

Embodiment 3

[0059] Configure the first mixed solution and the second mixed solution respectively, and the ratio is as follows:

[0060] The first mixed solution: methacrylic acid (12 parts) + ethylene cyclohexanol (6 parts) + 1,2-dimethyl-3-(1-methylvinyl) cyclopentanol (7 parts) + water (30 share)

[0061] The second mixed solution: thioglycolic acid (1.2 parts)+L~ascorbic acid (0.2 parts)+sodium hypophosphite (0.5 parts)+water (40 parts)

[0062] (1) Mix 40 parts of polyethylene glycol monomethyl ether, 10 parts of maleic anhydride, 0.6 parts of concentrated sulfuric acid, and 0.1 part of p-hydroxyanisole, heat up to 160°C-180°C, stir and vacuumize at the same time to make it React under a vacuum of 0.3MPa-0.5MPa for 5-7 hours. After the reaction is completed, add 160 parts of deionized water, cool down to below 60°C, and obtain an aqueous esterified monomer solution;

[0063] (2) Add 135 parts of vinyl polyoxyethylene ethers to the above-mentioned aqueous esterified monomer solution ...

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Abstract

The invention discloses an ester-ether copolymerization low-bleeding polycarboxylate superplasticizer which is prepared by polymerizing the following raw materials: methoxypolyethylene glycol, maleic anhydride, a catalyst, a polymerization inhibitor, vinyl polyoxyethylene ether, unsaturated acid, unsaturated cyclic alcohol, a composite reducing agent, a chain transfer agent and an initiator. The invention also discloses a preparation method of the polycarboxylate superplasticizer. Through the molecular structure design, the functional group distribution and molecular weight of the product are effectively adjusted, and the prepared product effectively reduces the occurrence of concrete segregation and bleeding phenomena when the sand material is relatively clean, especially non-continuous grading, and has a remarkable effect.

Description

technical field [0001] The invention belongs to the technical field of building admixtures, in particular to an ester ether copolymerized low bleeding polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer, as an emerging high-performance superplasticizer, has been highly valued by personnel in the construction industry in recent years due to its superior performance, environmental protection and non-pollution characteristics, and has been developed and promoted at a high speed. It continues to rise year by year, and the national key construction projects and projects also use polycarboxylate superplasticizer as a designated product. However, with the country's continuous expansion of infrastructure and the continuous improvement of environmental protection requirements, high-quality sand and gravel materials have gradually decreased. In recent years, desalinated sea sand has gradually been applied to th...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F290/06C08F220/06C08F216/10C08F228/02C04B24/16C04B24/26C04B103/30
CPCC08F283/065C08F290/062C04B24/2629C04B24/165C04B2103/302C08F220/06C08F216/10C08F228/02
Inventor 张乐朱巧勇于飞宇曾贤华黄文耀沈聪聪
Owner ZHEJIANG KZJ NEW MATERIALS CO LTD
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