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Polyimide film alkali-free glass cloth pre-impregnation composite material and preparation method thereof

A polyimide film, alkali-free glass cloth technology, applied in chemical instruments and methods, glass/slag layered products, adhesive types, etc., can solve the problems of inconvenient production operation, easy breakage, brittleness, etc. Achieve long storage period, excellent electrical properties, good flexibility

Inactive Publication Date: 2009-07-08
CHINESE ELECTRICAL EQUIP GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The polyimide film alkali-free glass cloth prepreg used for the interlayer insulation and interturn insulation of the low-voltage coil of the existing H-level dry-type transformer has a short storage period, such as after being stored at room temperature for 20 days or after being baked at 60°C for 24 hours It becomes hard, and there are many defects such as brittleness, powder falling, and easy breakage during use, which brings a lot of inconvenience to production operations, thus limiting the application of polyimide film alkali-free glass cloth prepreg on dry-type transformers. use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A preparation method of polyimide film alkali-free glass cloth pre-impregnated composite material, comprising the following steps:

[0033] In the first step, the resin solution with good heat resistance is mixed uniformly according to the following mass fraction ratio:

[0034] Bisphenol A type epoxy resin E-51 10%

[0035] Bisphenol A type epoxy resin E-12 28%

[0036] Novolac epoxy resin F-44 8%

[0037] DDS 12%

[0038] Polyester polyol 5%

[0039] Acetone 22%

[0040] Ethanol 15%

[0041] In the second step, the resin solution obtained in the first step is used as an adhesive to make a polyimide film alkali-free glass cloth composite material;

[0042] In the third step, the polyimide film alkali-free glass cloth composite material obtained in the second step is immersed in the resin solution prepared in the first step until it is completely saturated, and then baked and dried in an oven at 100°C. For 2 minutes, the product is obtained by natural cooling, an...

Embodiment 2

[0044] A preparation method of polyimide film alkali-free glass cloth pre-impregnated composite material, comprising the following steps:

[0045] In the first step, the resin solution with good heat resistance is mixed uniformly according to the following mass fraction ratio:

[0046] Bisphenol A type epoxy resin E-44 10%

[0047] Bisphenol A type epoxy resin E-12 25%

[0048] Novolac epoxy resin F-51 5%

[0049] DDS 12%

[0050] Reactive epoxy toughener 8%

[0051] Acetone 25%

[0052] Toluene 15%

[0053] In the second step, the resin solution obtained in the first step is used as an adhesive to make a polyimide film alkali-free glass cloth composite material;

[0054] In the third step, the polyimide film alkali-free glass cloth composite material obtained in the second step is immersed in the resin solution prepared in the first step until completely soaked, and then baked and dried in an oven at 150 ° C. The baking time is After 10 minutes, the product is cooled n...

Embodiment 3

[0056] A preparation method of polyimide film alkali-free glass cloth pre-impregnated composite material, comprising the following steps:

[0057] In the first step, the resin solution with good heat resistance is mixed uniformly according to the following mass fraction ratio:

[0058] Bisphenol A type epoxy resin EX-48 18%

[0059] Bisphenol A type epoxy resin E-12 22%

[0060] Novolac epoxy resin F-48 8%

[0061] 594 boron amine complex 5%

[0062] Polysulfoneamide 7%

[0063] Acetone 20%

[0064] Ethanol 20%

[0065] In the second step, the resin solution obtained in the first step is used as an adhesive to make a polyimide film alkali-free glass cloth composite material;

[0066]In the third step, the polyimide film alkali-free glass cloth composite material obtained in the second step is immersed in the resin solution prepared in the first step until it is completely soaked, and baked and dried in an oven at 135 ° C. The baking time is 5 Minutes, natural cooling is...

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Abstract

The invention provides a pre-dipping composite material with good flexibility and a preparation method. The pre-dipping composite material is prepared by gluing composite alkali-free glass cloth on two surfaces of a polyimide film, then dipping the polyimide film into a novel resin with good heat resistance, and baking the polyimide film; and the preparation method comprises steps of dipping the composite material into resin solution, drying, naturally cooling and the like. The pre-dipping material has the advantages of good flexibility, long storage period and difficult cracking, and can be used at any angle; and a cured substance has excellent electric property, heat resistance and adhesive property. The pre-dipping composite material can be used for insulation and end sealing insulation among coil layers of F and H-grade dry transformers, and can also be suitable for slot insulation and inter-turn insulation of H-grade motors.

Description

technical field [0001] The invention relates to a preparation method of an insulating material, in particular to a preparation method of a polyimide film alkali-free glass cloth pre-impregnated composite material. Background technique [0002] The polyimide film alkali-free glass cloth prepreg used for the interlayer insulation and interturn insulation of the low-voltage coil of the H-class dry-type transformer has a short storage period, such as after being stored at room temperature for 20 days or after being baked at 60°C for 24 hours It becomes hard, and there are many defects such as brittleness, powder falling, and easy breakage during use, which brings a lot of inconvenience to production operations, thus limiting the application of polyimide film alkali-free glass cloth prepreg on dry-type transformers. use. Contents of the invention [0003] In order to solve the shortcomings of the currently used polyimide film non-alkali glass cloth pre-impregnated composite ma...

Claims

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Application Information

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IPC IPC(8): B32B7/12B32B17/04B32B27/04B32B37/12B32B38/08C09J163/02C09J163/04C08J7/04
Inventor 刘超孙宏胡兆楠
Owner CHINESE ELECTRICAL EQUIP GRP CO LTD
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