Method for preparing modified polyvinyl alcohol copolymer cross-linked ceramic green body reinforcing agent

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...

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.

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