Preparation method of low-density thermoplastic polyimide micro-foamed material

A technology of polyimide and thermoplastic, applied in the field of preparation of polyimide micro-foaming materials, can solve the problems of high density, high content of open-cell structure, large cell size of foaming materials, etc., and achieve cell structure Uniformity, simple and easy preparation method, high cell density

Inactive Publication Date: 2012-10-03
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The foamed material prepared by this method has the defects of large cell size (>100μm), high content of open cell structure, and high density

Method used

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  • Preparation method of low-density thermoplastic polyimide micro-foamed material
  • Preparation method of low-density thermoplastic polyimide micro-foamed material
  • Preparation method of low-density thermoplastic polyimide micro-foamed material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In the present embodiment, thermoplastic polyimide selects the Ultem1010 polyimide of GE Company for use, and its molecular structural formula is where A is B for

[0041] high pressure CO 2 The above-mentioned thermoplastic polyimide is physically foamed with high-pressure tetrahydrofuran fluid, and the specific foaming process is as follows:

[0042] (1) Inject thermoplastic polyimide into a single screw under high pressure, and melt extrude to prepare a polyimide sheet with a thickness of 2mm;

[0043] (2) Put the thermoplastic polyimide sheet prepared in step (1) into the autoclave, and pass CO at a pressure of 5MPa 2 and tetrahydrofuran high-pressure fluids to make CO 2 Saturated with tetrahydrofuran in the polyimide sheet, the saturation temperature is 10°C, and the saturated polyimide sheet is obtained;

[0044] (3) Put the saturated polyimide sheet into a mold, and then foam it in a high-temperature oil bath at 220° C. for 30 seconds to obtain a microfo...

Embodiment 2

[0065] In this embodiment, the thermoplastic polyimide is the same as that selected in Embodiment 1. In this embodiment 1, high-pressure HFC-245fa and high-pressure tetrahydrofuran fluid are used to physically foam the above-mentioned thermoplastic polyimide, and the specific foaming process is as follows:

[0066] (1) Inject thermoplastic polyimide into a single screw under high pressure, and melt extrude to prepare a polyimide sheet with a thickness of 2mm;

[0067] (2) Put the thermoplastic polyimide sheet prepared in step (1) into an autoclave, and feed HFC-245fa and tetrahydrofuran high-pressure fluid with a pressure of 12MPa to make HFC-245fa and tetrahydrofuran in the polyimide sheet The material reaches saturation, and the saturation temperature is 100°C to obtain a saturated polyimide sheet;

[0068] (3) Put the saturated polyimide sheet into a mold, and then foam it in a high-temperature oil bath at 170° C. for 20 seconds to obtain a microfoamed polyimide sheet.

...

Embodiment 3

[0081] In this embodiment, the thermoplastic polyimide is the same as that selected in Embodiment 1. In this example, high pressure CO 2 The above-mentioned thermoplastic polyimide is physically foamed with methanol fluid, and the specific foaming process is as follows:

[0082] (1) Inject thermoplastic polyimide into a single screw under high pressure, and melt extrude to prepare a polyimide sheet with a thickness of 5mm;

[0083] (2) Put the thermoplastic polyimide sheet prepared in step (1) into an autoclave, and pass CO at a pressure of 15MPa 2 and methanol high-pressure fluids that make CO 2 Saturation with methanol in the polyimide sheet, the saturation temperature is 100°C, to obtain a saturated polyimide sheet;

[0084] (3) Put the saturated polyimide sheet into a mold, and then foam it in a high-temperature oil bath at 240° C. for 15 seconds to obtain a microfoamed polyimide sheet.

[0085] The polyimide micro-foamed sheet prepared above has smooth surface, soft t...

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Abstract

The invention discloses a preparation method of a low-density thermoplastic polyimide micro-foamed material. In the preparation method of the low-density thermoplastic polyimide micro-foamed material, when thermoplastic polyimide is physically foamed by taking one or more of high-pressure fluids CO2, N2, HFC and HCFC as a physical foaming agent and by taking one or more of tetrahydrofuran, chloroform, ethanol, methanol, acetone, pyridine, N-methyl-pyrrolidone, and N, N-dimethylformamide as an organic co-solvent, the high pressure fluid and the organic solvent are kept in high-pressure saturated states in a polyimide sheet, and then, the saturated polyimide sheet is foamed in a high-temperature oil bath. The obtained polyimide micro-foamed sheet is a light-weight and low-density material, is smooth in surface, soft in texture, free of powder dropping in the using process, uniform in cell structure, high in cell density and excellent in tensile property, and is a foamed material with a wide application prospect.

Description

technical field [0001] The invention relates to the field of preparation of polyimide micro-foaming materials, in particular to a preparation method of low-density thermoplastic polyimide micro-foaming materials with microporous structure, smooth material surface and excellent mechanical properties. Background technique [0002] Polyimide foam has excellent high and low temperature resistance, physical and mechanical properties, radiation resistance and low dielectric properties, so it is used as a wave-transmitting material, damping material, high and low temperature resistant material and low dielectric material for aircraft , submarines, radar and other high-tech fields. [0003] A large number of patents at home and abroad disclose methods for preparing low-density polyimide foam materials by chemical foaming and physical foaming. 50~300Kg / m 3 ), the cell size is above 200 microns, and there is a certain degree of open cell structure. The existence of such a large-siz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/14C08J9/12C08L79/08C08G73/10
Inventor 翟文涛郑文革凌建强
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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