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Preparation method of viscosity-reduction type polycarboxylate water reducer

A technology of viscous polycarboxylic acid and water reducer, which is applied in the field of concrete admixtures in building materials, can solve the problems of high viscosity, achieve high dispersion, obvious viscosity reduction effect, and good adaptability

Inactive Publication Date: 2014-06-18
NANJING RUIDI HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention does not involve the molecular structure design of carboxylic acid copolymers to solve the problem of high viscosity of cement-based materials with low water-to-cement ratio

Method used

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  • Preparation method of viscosity-reduction type polycarboxylate water reducer
  • Preparation method of viscosity-reduction type polycarboxylate water reducer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Put 100 parts of methyl alkenyl polyoxyethylene ether (see general formula 1 for molecular structure, n=50) into the bottom of the kettle, add 100 parts of deionized water, heat up to 60°C, stir to dissolve, and then put 10 parts of butyl acrylate Parts, 70 parts of random polyoxyethylene oxypropylene ether acrylate (see general formula 1 for molecular structure, m=50, q=10, z=0), stir evenly;

[0027] 2) Control the temperature at 60°C, add 3.5 parts of potassium persulfate into the kettle, and stir for 10 minutes;

[0028] 3) Control the temperature at 60°C, add dropwise a mixed solution containing 15 parts of acrylic acid, 1.2 parts of mercaptoethanol and 15 parts of deionized water for 3 hours;

[0029] 4) Continue to keep warm for 2 hours

[0030] 5) Cool down to 35°C-40°C, add 30% liquid caustic soda to neutralize, and adjust the pH value to 5. Add water and dilute to 40% concentration to obtain the product VPC-1 of the present invention.

Embodiment 2

[0032] 1) Put 100 parts of methyl alkenyl polyoxyethylene ether (see general formula 1 for molecular structure, n=50) into the bottom of the kettle, add 100 parts of deionized water, heat up to 60°C, stir to dissolve, and then put in butyl acrylate 5 70 parts, 70 parts of methoxy atactic polyoxyethylene oxypropylene ether acrylate (see general formula 1 for molecular structure, m=50, q=20, z=0), stir evenly;

[0033] 2) Control the temperature at 60°C, add 3.5 parts of potassium persulfate into the kettle, and stir for 10 minutes;

[0034] 3) Control the temperature at 60°C, add dropwise a mixed solution containing 15 parts of acrylic acid, 1.2 parts of mercaptoethanol and 15 parts of deionized water for 3 hours;

[0035] 4) Continue to keep warm for 2 hours

[0036] 5) Cool down to 35°C-40°C, add 30% liquid caustic soda to neutralize, and adjust the pH value to 5. Add water and dilute to 40% concentration to obtain the product VPC-2 of the present invention.

Embodiment 3

[0038] 1) Put 100 parts of methyl alkenyl polyoxyethylene ether (see general formula 1 for molecular structure, n=50) into the bottom of the kettle, add 100 parts of deionized water, heat up to 60°C, stir to dissolve, and then put in butyl acrylate 5 70 parts, 70 parts of methoxy atactic polyoxyethylene oxypropylene oxybutylene acrylate (see general formula 1 for molecular structure, m=50, q=20, z=20), stir evenly;

[0039] 2) Control the temperature at 60°C, add 3.5 parts of potassium persulfate into the kettle, and stir for 10 minutes;

[0040] 3) Control the temperature at 60°C, add dropwise a mixed solution containing 15 parts of acrylic acid, 1.2 parts of mercaptoethanol and 15 parts of deionized water for 3 hours;

[0041] 4) Continue to keep warm for 2 hours

[0042] 5) Cool down to 35°C-40°C, add 30% liquid caustic soda to neutralize, and adjust the pH value to 5. Add water and dilute to 40% concentration to obtain the product VPC-3 of the present invention.

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Abstract

The invention discloses a preparation method of a viscosity-reduction type polycarboxylate water reducer, which belongs to the field of concrete admixtures. The water reducer is prepared from random polyoxyalkyl ether unsaturated acid ester, unsaturated modified polyoxyethylene ether, unsaturated acid alkyl ester, and (methyl) acrylic acid, by means of copolymerization with an aqueous solution and then adding alkali for neutralization, under the presence of an initiator and a molecular weight regulator. By a certain quantity of hydrophobic units and hydrophobic groups which are introduced into and controlled in carboxylic acid copolymer molecule structures, the viscosity of a cement-based material is reduced under the presence of the water reducer. The water reducer prepared by the method has the advantages of high viscosity reducing effect, high dispersibility, good adaptability to cement, and the like; the water reducer is especially applicable to preparation of high-strength concrete, self-compacting concrete, low-water-binder-ratio high-dosage mineral admixture concrete, and the like.

Description

technical field [0001] The invention belongs to the field of concrete admixture in building materials. In particular, it relates to a method for preparing a viscosity-reducing polycarboxylate water reducer. Background technique [0002] With the in-depth study of functional design, the advantages of polycarboxylate water reducer, such as low dosage, high water reduction, high slump retention, and early strength, have been gradually realized, and it has been widely used in civil engineering and other fields. At present, the polycarboxylate superplasticizers on the market all have excellent dispersion properties, and can usually meet the requirements of low water-binder ratio concrete for water-reducing rate, but they cannot solve the construction performance of concrete caused by low water-binder ratio. problem. The development of high-performance concrete technology is inseparable from the development and application of polycarboxylate-based water reducers. The addition o...

Claims

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Application Information

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IPC IPC(8): C08F290/06C08F220/18C08F220/06C08F8/44C04B24/26C04B103/30
Inventor 唐修生温金保黄国泓祝烨然季海马进南
Owner NANJING RUIDI HIGH TECH
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