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

A technology of polyvinyl acetal and low water absorption, which is applied in the field of polymer materials to achieve the effects of shortening condensation time, stable quality and high yield

Active Publication Date: 2018-04-20
天元(宜昌)新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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

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Embodiment

[0035] A continuous preparation method of a carbon-oxygen cross-linked polyvinyl acetal insulating material with high toughness and low water absorption, the steps are as follows:

[0036] Step 1: Preparation of polyvinyl alcohol-acetaldehyde water emulsion

[0037] Add 650 parts by mass of water into the dissolution tank, add 52 parts by mass of polyvinyl alcohol under stirring, keep warm at 25°C for 1.5h, raise the temperature to 95°C and keep warm for 1.5h, and when the temperature is lowered to 65°C, filter to obtain polyvinyl alcohol Vinyl alcohol aqueous solution, and then 10 parts by mass of acetaldehyde aqueous solution was added to the solution at a temperature of 35°C, and stirred for 60 minutes to obtain a polyvinyl alcohol-acetaldehyde aqueous emulsion

[0038] Step 2: Preparation of polyvinyl alcohol-acetaldehyde-hydrochloric acid aqueous emulsion

[0039] Cool the uniformly stirred polyvinyl alcohol-acetaldehyde water emulsion to 13°C, and add a hydrochloric aci...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F116/06C08F8/28
CPCC08F8/28C08F116/06
Inventor 陈海云杨录新
Owner 天元(宜昌)新材料科技有限公司
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