A preparation method of a modified polyvinyl alcohol copolymer cross-linked ceramic green body reinforcing agent

The technology of polyvinyl alcohol copolymer and ceramic body is applied in the field of ceramic body reinforcing agent, which can solve the problems of increasing the viscosity of the body slurry, pollution, and reducing the yield of finished products, so as to increase the strength of the green body and have a broad application prospect. , the effect of increasing strength

Active Publication Date: 2018-06-15
四会市奥耳新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the reinforcing agents commonly used in domestic ceramic production include carboxymethyl cellulose, polyvinyl alcohol, etc., but adding these reinforcing agents will increase the viscosity of the green body slurry, which brings great inconvenience to ceramic production
[0003] Chinese Patent No. CN201410834890.6 discloses an acrylamide-grafted cornstarch ceramic enhancer and its preparation method and application. Starch is used as the main synthetic raw material. It has a wide source and no pollution. Compared with other enhancers, it is cleaner and greener; Natural starch has disadvantages such as poor processing performance, difficulty in dispersing at low temperature and poor penetration ability, high price of polyacrylamide, pollution of residual monomers, and restrictions on use by various conditions.
[0006] However, the current reinforcing agent still has production problems such as affecting the fluidity of the mud and producing pinholes and black spots, which increases the cost of ceramic production and reduces the yield of finished products.

Method used

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  • A preparation method of a modified polyvinyl alcohol copolymer cross-linked ceramic green body reinforcing agent
  • A preparation method of a modified polyvinyl alcohol copolymer cross-linked ceramic green body reinforcing agent
  • A preparation method of a modified polyvinyl alcohol copolymer cross-linked ceramic green body reinforcing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] a. Add 100 parts (by mass) of vinyl acetate and 42 parts of acrylic acid into the reactor, add 50 parts of ethanol and stir to completely dissolve the monomers and obtain a mixed solution I;

[0027] b. Add 1 part of sodium hypophosphite to the above mixed solution I, stir and fully dissolve to obtain mixed solution II, and heat the mixed solution II to 90°C;

[0028] c. Dissolve 0.5 parts of ammonium persulfate in water, and add the solution dropwise to the mixed solution II, and react at 90°C for 4 hours to obtain the mixed solution III;

[0029] d. Add 5 parts of sodium hypophosphite to the mixed solution III, and at the same time add sodium hydroxide solution to adjust the pH of the system to 7, stop heating, and cool under stirring conditions to obtain a modified polyvinyl alcohol copolymer cross-linked ceramic Body enhancer.

[0030] According to the laboratory test, 0.4% of the reinforcing agent of the present invention is added to the ceramic standard formula s...

Embodiment 2

[0034] a. Add 100 parts (by mass) of vinyl acetate and 420 parts of acrylic acid into the reactor, add 500 parts of ethanol and stir to completely dissolve the monomers and obtain a mixed solution I;

[0035] b. Add 20 parts of sodium sulfite to the above mixed solution I, stir and fully dissolve to obtain mixed solution II, and heat mixed solution II to 60°C;

[0036] c. Dissolve 20 parts of potassium persulfate in water, and add the solution dropwise to the mixed solution II, and react at 60°C for 2 hours to obtain the mixed solution III;

[0037] d. Add 10 parts of sodium sulfite to the mixed liquid III, and at the same time add ammonia solution to adjust the pH of the system to 7, stop heating, and cool under stirring conditions to obtain a modified polyvinyl alcohol copolymer cross-linked ceramic body strengthening agent .

[0038] According to the laboratory test, 0.3% of the reinforcing agent of the present invention is added to the ceramic standard formula soil slurry...

Embodiment 3

[0042] a. Add 100 parts (by mass) of vinyl acetate and 200 parts of acrylic acid into the reactor, add 300 parts of ethanol and stir to completely dissolve the monomers and obtain a mixed solution I;

[0043] b. Add 8 parts of sodium bisulfite to the above mixed solution I, stir and fully dissolve to obtain mixed solution II, and heat mixed solution II to 80°C;

[0044]c. Dissolve 3 parts of ammonium persulfate in water, and add the solution dropwise to the mixed solution II, and react at 80°C for 3.5 hours to obtain the mixed solution III;

[0045] d. Add 8 parts of sodium hypophosphite to the mixed liquid III, and at the same time add potassium hydroxide solution to adjust the pH of the system to 8, stop heating, and cool under stirring conditions to obtain a modified polyvinyl alcohol copolymer cross-linked ceramic Body enhancer.

[0046] According to the laboratory test, 0.5% of the reinforcing agent of the present invention is added to the ceramic standard formula soil s...

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Abstract

The invention relates to a modified polyvinyl alcohol copolymer cross-linked ceramic green body reinforcing agent. Vinyl acetate and acrylic acid are subjected to a free-radical polymerization reaction in the presence of an initiator and a chain transfer agent, part of ester bonds of the copolymer are hydrolyzed when an alkali is added for treatment, and then, the acrylic acid and vinyl acetate modified polyvinyl alcohol copolymer ceramic green body reinforcing agent is prepared. The copolymer cross-linked ceramic green body reinforcing agent disclosed by the invention has relatively good dispersity, and the viscosity of slurry cannot be improved by adding the reinforcing agent into a ceramic slurry system; and during the forming of green body slurry, the slurry is completely hydrolyzed into an acrylic acid and vinyl alcohol copolymer under alkaline conditions, and hydroxyl groups of the copolymer are subjected to hydrogen bonding with particles in a green body, so that internal particles of the green body are of a reticular structure, the green strength, dried strength and glazed strength of the green body are greatly improved. The strength of the ceramic green body is greatly improved while the original adhesiveness, dispersity and viscosity reducing property of polyvinyl alcohol are kept, so that the reinforcing agent has a broad application prospect.

Description

technical field [0001] The invention belongs to the technical field of ceramic body reinforcing agents, and in particular relates to a preparation method of a modified polyvinyl alcohol copolymer cross-linked ceramic body reinforcing agent. Background technique [0002] While improving people's quality of life, ceramics have brought a heavy burden to energy and environmental resources—the high-quality clay resources, the main raw material for ceramic production, are increasingly depleted. Due to the non-renewability of high-quality clay, in the production process of ceramics, the proportion of high-quality clay gradually decreases, and the proportion of clay with more barren materials gradually increases, resulting in a decrease in the dry strength of the ceramic body, cracks, broken corners, missing edges, etc. Many defects are so serious that the yield rate is seriously reduced, affecting ceramic production. Finding or manufacturing new raw materials to replace or partial...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F218/08C08F220/06C08F8/12C04B35/634
CPCC04B35/63416C08F8/12C08F218/08C08F2800/20C08F2810/40C08F220/06
Inventor 谢义鹏许钧强康伦国姚东生
Owner 四会市奥耳新材料有限公司
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