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Low-dielectric polyimide fiber, preparation method and application

A technology of polyimide fiber and polyimide matrix, which is applied in the field of low dielectric polyimide fiber and its preparation, to achieve the effects of reducing production cost, simple fiber preparation method, and simple preparation method

Active Publication Date: 2020-06-23
CHANGSHA ADVANCED MATERIALS IND RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a low-dielectric polyimide fiber and its preparation method and application, which solves the technical method of obtaining polyimide precipitated fiber by spinning first and then refining in the prior art, and proposes a A new organic special functional fiber material, the invention relates to a low-dielectric polyimide fiber and its preparation method, which can be applied to high-end insulating materials, low-dielectric composite materials, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Add 139.5 g of dimethylacetamide and 28.1 g of xylene into a four-necked round-bottomed flask equipped with a mechanical stirrer, a water separator, a condensation reflux device and nitrogen protection, start stirring, then add 11.03 g of p-phenylenediamine until fully Dissolve, heat up to 110°C, add 35.41g P6FDA in three batches, heat up to 145°C and react for 8 hours to obtain a polyimide mother liquor, add 195.5g dimethylacetamide to the mother liquor and cool to obtain a resin precursor liquid. Dimethylacetamide and water are prepared according to the mass ratio of 1:1 to prepare the precipitating solution, and the prepared precipitating solution and resin precursor solution are respectively continuously entered into the precipitating equipment with a rotation speed of 800rpm, and the precipitating solution and resin precursor The mass ratio of the liquid is 4:1, the linear flow velocity of the precipitating liquid and the precursor liquid is 0.5m / s respectively, an...

Embodiment 2

[0048]Add 218.2 g of dimethylacetamide and 36.4 g of xylene into a four-necked round-bottomed flask equipped with a mechanical stirrer, water separator, condensation reflux device and nitrogen protection, start stirring, then add 34.12 g of 6FDAM until fully dissolved, and heat up To 116°C, add 21.85g of pyromellitic anhydride in three batches, after the addition, raise the temperature to 149°C and react for 10 hours to obtain a polyimide mother liquor, add 195.5g of dimethylacetamide to the mother liquor and cool to obtain a resin Precursor. Dimethylacetamide and water are prepared according to the mass ratio of 1:0.8 to prepare the precipitating solution, and the prepared precipitating solution and resin precursor solution are respectively continuously entered into the precipitating equipment with a rotation speed of 1200rpm, and the precipitating solution and resin precursor The mass ratio of the liquid is 6:1, the linear flow velocity of the precipitating liquid and the pr...

Embodiment 3

[0050] Add 230.3 g of dimethylacetamide and 33.2 g of xylene to a four-necked round-bottomed flask equipped with a mechanical stirrer, a water separator, a condensing reflux device, and nitrogen protection, start stirring, then add 18.2 g of DABTF until fully dissolved, and heat up To 120°C, add 35.51g of P6FDA in three batches. After the addition, raise the temperature to 150°C and react for 10 hours to obtain a polyimide mother liquor. Add 280.5g of dimethylacetamide to the mother liquor and cool to obtain a resin precursor. Dimethylacetamide and water are prepared according to the mass ratio of 0.8:1 to prepare the precipitating solution, and the prepared precipitating solution and resin precursor solution are respectively continuously entered into the precipitating equipment with a rotation speed of 1500rpm, and the precipitating solution and resin precursor The mass ratio of the liquid is 5:1, the linear flow velocity of the precipitating liquid and the precursor liquid is...

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PUM

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Abstract

The invention discloses a preparation method of a low-dielectric polyimide fiber. The preparation method comprises the following steps: S1, under the protection of nitrogen, adding aromatic diamine into a polar solvent and xylene for full dissolution, and then raising the temperature to 110-125 DEG C to prepare a mixed solution; S2, adding aromatic dianhydride into the mixed solution in batches, and continuously raising the temperature to 140-160 DEG C for thermal imidization reaction for 6-12h to form a polyimide mother solution; and S3, precipitating the polyimide mother solution to preparethe low-dielectric polyimide fiber, wherein the molar ratio of aromatic diamine to aromatic dianhydride is 1.01-1.15. The preparation method is simple, and the problem of a conventional preparation method for preparing fiber pulp by a spinning and then pulping treatment process is solved; and the polyimide mother solution is prepared by a one-step method, so that the operation process and the preparation period are saved, the preparation cost of the polyimide fiber is reduced, and the fiber preparation method is simple and can realize continuous production.

Description

technical field [0001] The invention belongs to the technical field of special functional organic fibers, and relates to a low-dielectric polyimide fiber, its preparation method and application. Background technique [0002] Polyimide fiber is a special organic fiber material with high and low temperature resistance, good dielectric properties, and flame retardancy. As a special fiber material, it is widely used in aerospace, weapons, ships, and rail transportation due to its excellent performance. , electronics industry, high temperature protection and other fields, especially in the field of high-end equipment with dielectric and lightweight functional products, polyimide fibers can be used as dielectric materials, shielding protection materials, high-temperature insulation materials in integrated circuits, and can also be used Lightweight materials are used in aviation, high-speed rail, ships, etc. [0003] With the increase of communication transmission rate, signal str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/74
CPCD01F6/74
Inventor 周利庄黄活阳王芳马彦
Owner CHANGSHA ADVANCED MATERIALS IND RES INST CO LTD