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Superfine glass fiber, preparation method and application thereof, and polyimide film

A technology of ultra-fine glass fiber and polyimide film, applied in the field of polyimide film and glass fiber, can solve problems such as the decline of comprehensive mechanical properties of the film

Inactive Publication Date: 2020-03-24
ANHUI GUOFENG PLASTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface of the inorganic filler and the film matrix are in a phase separation state, which will lead to a decrease in the comprehensive mechanical properties of the film.

Method used

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  • Superfine glass fiber, preparation method and application thereof, and polyimide film
  • Superfine glass fiber, preparation method and application thereof, and polyimide film
  • Superfine glass fiber, preparation method and application thereof, and polyimide film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A preparation method of ultrafine glass fibers, comprising the steps of:

[0044] S1. Take 10 g of glass fibers with an average diameter of 0.8 μm and an average length of 30 μm, soak them in 90 g of 5% sodium hydroxide aqueous solution at room temperature for 4 hours, filter, wash the filter cake with water, and dry it in a vacuum oven at 70 ° C. Disperse in 90g of N,N-dimethylformamide to obtain solution A, raise the temperature to 60°C, add 1g of diphenylmethane diisocyanate and 0.002g of stannous octoate, diphenylmethane diisocyanate and stannous octoate with N, After N-dimethylformamide is dissolved, add it, keep it warm for 4 hours, filter, wash the filter cake with N,N-dimethylformamide, and dry it in a vacuum oven at 70°C to obtain the intermediate material;

[0045] S2. Uniformly disperse 10g of the intermediate material in 90g of N,N-dimethylformamide to obtain solution B. In a nitrogen atmosphere, add 1g of diaminodiphenyl ether to solution B, react at 60°C f...

Embodiment 2

[0047] A preparation method of ultra-fine glass fibers, the diaminodiphenyl ether is replaced by p-phenylenediamine, and the others are the same as in embodiment 1.

Embodiment 3

[0049]A low thermal shrinkage polyimide film, the preparation method of which comprises the steps of: dissolving 30g of diaminodiphenyl ether in 300g of N,N-dimethylformamide to obtain a diamine solution; adding 0.2g of diamine to the diamine solution The ultra-fine glass fibers obtained in Example 1 were stirred and dispersed evenly, and then added in portions of pyromellitic dianhydride, and when stirring until the viscosity was 30-130PaS, the addition of pyromellitic dianhydride was stopped to obtain a colloid, and the colloid was placed in a vacuum Degas at room temperature in an oven, then use a film coater to coat a film with a thickness of 300 μm on a glass plate, and then place it in an oven for gradual imidization. The imidization procedure is: keep warm at 80°C for 5 minutes, then heat up to 180°C and keep warm 7min, then raise the temperature to 320°C for 10min, then raise the temperature to 450°C for 5min, tear off the film after cooling to obtain a low-heat-shrinka...

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PUM

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Abstract

The invention discloses a preparation method of superfine glass fiber, and the method comprises the following steps: S1, soaking glass fibers in a sodium hydroxide aqueous solution, washing, drying, uniformly dispersing in an organic solvent to obtain a solution A, adding diisocyanate and a catalyst, reacting, filtering, and washing a filter cake to obtain an intermediate material; and S2, uniformly dispersing the intermediate material in an organic solvent to obtain a solution B, adding diamine into the solution B in an inert gas atmosphere for reaction, filtering, washing a filter cake, anddrying to obtain the superfine glass fiber. The invention further discloses the superfine glass fiber which is prepared according to the preparation method of the superfine glass fiber. The inventionalso discloses application of the ultrafine glass fiber in a polyimide film. The invention further discloses a low-heat-shrinkage polyimide film. The surface of the prepared superfine glass fiber is grafted with-NH2, and the superfine glass fiber can be combined with polyimide to achieve the effects of reducing thermal shrinkage of the polyimide film and maintaining mechanical properties.

Description

technical field [0001] The invention relates to the technical field of polyimide film and glass fiber, in particular to an ultrafine glass fiber, its preparation method, application and polyimide film. Background technique [0002] Polyimide is a special engineering plastic with excellent performance. Because of its excellent heat resistance, insulation properties are widely used in aerospace equipment manufacturing, printed circuit boards, integrated circuits, battery packaging, etc. The polyimide film needs to be glued to the copper plate when making the circuit board. Metal materials generally do not produce heat shrinkage, but polyimide film as a polymer will produce about 0.15-0.3% shrinkage, which will lead to tearing of the film or deformation of the copper plate, and scrapping of components. Therefore, reducing the thermal shrinkage of polyimide films has become the main direction of research and development of polyimide films. [0003] At present, there are mainl...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L79/08C08K9/04C08K7/14C03C25/66C03C25/24
CPCC08J5/18C08K9/04C08K7/14C03C25/66C03C25/24C08J2379/08
Inventor 方超
Owner ANHUI GUOFENG PLASTIC
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