A preparation method of high toughness and low water absorption carbon-oxygen cross-linked polyvinyl acetal insulating material

Abstract

The invention discloses a preparation method of a high-tenacity low-water absorbability carbon oxygen crosslinked polyvinyl acetal insulating material, and belongs to the field of high-polymer materials. The preparation method comprises the following steps: taking polyvinyl alcohol as a raw material, dissolving polyvinyl alcohol with deionized water, cooling, carrying out a reaction between polyvinyl alcohol and a part of acetaldehyde at a low temperature under the catalysis of an inorganic acid, adding the rest acetaldehyde when the temperature is lowered to a proper temperature to ensure acetalization between the rest acetaldehyde and polyvinyl alcohol, heating to 40-60 DEG C at a temperature rising rate of 4-16 DEG C / h to ensure acetalization, separating polyvinyl acetal and an acid liquid via a centrifuger after acetalization is finished, washing the obtained polyvinyl acetal in a vacuum suction filtration washing machine with deionized water and dilute alkali, and carrying out centrifugal drying and pneumatic drying to obtain the product polyvinyl acetal. The carbon-oxygen-crosslinked polyvinyl acetal insulating material is excellent in strength, tenacity, weatherability, water resistance, and decay resistance, low in water absorbability, beneficial in tear resistance, high in service performance, wide in application range, and suitable for industrialized production.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a preparation method of a carbon-oxygen cross-linked polyvinyl alcohol insulating material with high toughness and low water absorption. Background technique [0002] At present, in the electronics industry, polyvinyl acetal can be used in emerging electronic products such as integrated circuits, positive and negative temperature coefficient thermistors, switching power supplies, high-voltage power supplies, and ultra-thin power supplies. [0003] The glass transition temperature of polyvinyl butyral is 60-80°C (due to different degrees of polymerization), while the glass transition temperature of polyvinyl acetal is between 110-140°C. Molecular material, with good insulation and low temperature sensitivity coefficient, can be applied to electronic products that have higher requirements on glass transition temperature, such as integrated circuit boards, thermistors, s...

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a method for preparing high toughness and low water absorption carbon-oxygen cross-linked polyvinyl acetal for the shortcomings of the above-mentioned traditional synthesis methods. The carbon-oxygen cross-linked polyvinyl acetal The product prepared by the preparation method of vinyl acetal has a high content of acetaldehyde group, which can increase the insulation performance, heat resistance performance, and the product has high thermal stability

Images