Flexible polyimide foam and preparation method and applications thereof

A polyimide, polyimide precursor technology, applied in the field of polyimide, can solve the problems of uneven foam density, poor uniformity, holes, etc., and achieve the effect of uniform density and pore size, and uniform pore size

Active Publication Date: 2019-04-09
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional method of preparing soft open-cell polyimide foam is more likely to be accompanied by a series of problems such as holes, poor uniformity, and uneven foam density.

Method used

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  • Flexible polyimide foam and preparation method and applications thereof
  • Flexible polyimide foam and preparation method and applications thereof
  • Flexible polyimide foam and preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] 1) Add 40 parts of BTDA, 50 parts of low-boiling point solvent absolute ethanol, and 45 parts of low-boiling point solvent tetrahydrofuran into a there-necked flask equipped with a mechanical stirrer, a spherical condenser and a thermometer, and heat and reflux for 3 hours under stirring to obtain Homogeneous solution of diesters of aromatic diacids.

[0067] 2) Add 40 parts of 4,4'-ODA to the homogeneous solution obtained in step 1), and add 0.1 part of imidization accelerator isoquinoline, and 1.5 parts of polyethylene glycol 600, under the condition of nitrogen protection Under stirring and reflux for 20 minutes to carry out polycondensation reaction, a homogeneous solution was obtained.

[0068] 3) 0.5 parts of polyoxyethylene ether nonionic fluorocarbon surfactant FSO-100 was stirred and refluxed for 20 minutes under nitrogen protection to obtain a polyimide precursor resin solution.

[0069] 4) The polyimide precursor resin solution in step 3) was rotary evapor...

Embodiment 2

[0092] 1) Add 80 parts of BTDA, 60 parts of low-boiling point solvent absolute ethanol, and 50 parts of low-boiling point solvent tetrahydrofuran into a there-necked flask equipped with a mechanical stirrer, a spherical condenser and a thermometer, and heat and reflux for 3 hours under stirring to obtain Homogeneous solution of diesters of aromatic diacids.

[0093] 2) Add 80 parts of 4,4'-ODA to the homogeneous solution obtained in step 1), and add 0.5 parts of imidization accelerator isoquinoline, and 3 parts of polyethylene glycol 600, under the condition of nitrogen protection Under stirring and reflux for 20 minutes to carry out polycondensation reaction, a homogeneous solution was obtained.

[0094] 3) 1 part of polyoxyethylene ether nonionic fluorocarbon surfactant FSO-100 was stirred and refluxed for 30 minutes under nitrogen protection to obtain a polyimide precursor resin solution.

[0095] 4) The polyimide precursor resin solution in step 3) was rotary evaporated...

Embodiment 3

[0101] 1) Add 40 parts of ODPA, 60 parts of low boiling point solvent absolute ethanol, and 30 parts of low boiling point solvent tetrahydrofuran in a there-necked flask equipped with a mechanical stirrer, a spherical condenser and a thermometer, and heat and reflux for 4 hours under stirring to obtain Homogeneous solution of diesters of aromatic diacids.

[0102] 2) Add 40 parts of 3,4'-ODA to the homogeneous solution obtained in step 1), add 0.1 part of imidization accelerator isoquinoline, and 1 part of silicone oil, and stir and reflux for 40 minutes under nitrogen protection. Polycondensation reaction to obtain a homogeneous solution.

[0103] 3) 0.1 part of polyoxyethylene ether nonionic fluorocarbon surfactant FSO-100 was stirred and refluxed for 40 minutes under nitrogen protection to obtain a polyimide precursor resin solution.

[0104] 4) Rotate the polyimide precursor resin solution in step 3) to a viscous state at 60°C and pour it into a porcelain dish, then cov...

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Abstract

The present invention relates to flexible polyimide foam and a preparation method and applications thereof. The flexible polyimide foam is obtained by foaming a block/plate-shaped polyimide foam precursor containing slow-release components of a foaming agent; and the flexible polyimide foam has the average density of 14.7-47.7 kg/m<3> and the pore size of 130-530 micrometers. The flexible polyimide foam disclosed by the invention has the beneficial effects that by adopting a foaming form of a polyimide (PI) precursor block/plate, the problem of large density deviation in the thickness direction, of a polyimide precursor powder foaming method, can be effectively solved and the product yield of the foam made from the prepolymerized powder is improved; by adopting the PI precursor containingthe slow-release components and by regulating and controlling the type and the using amount of the slow-release components of the foaming agent, the density of the PI flexible foam can be adjusted andcontrolled, so that the foaming process window is wider and the pore size of the foam is more uniform; and meanwhile, by adopting the polyimide precursor plate, the water absorption rate can be effectively reduced and the storage time of the material is prolonged in the preservation process, so that the quality stability of the final foam product is improved.

Description

technical field [0001] The invention belongs to the technical field of polyimide, and in particular relates to a soft polyimide foam, its preparation method and its application. Background technique [0002] Polyimide (PI) foam is a class of polymer materials containing a large number of gas micropores / mesopores / nanopores. Compared with traditional foam plastics, polyimide foam not only has the characteristics of heat insulation, shock absorption, and noise reduction, but also has the characteristics of high temperature resistance, low temperature resistance, intrinsic flame retardancy, radiation resistance, and low smoke emission rate. It has been widely and important used in many high-tech fields such as aerospace, aviation, space, ships, and nuclear power. According to the cell structure, polyimide foam is divided into two categories: soft open-cell foam and rigid closed-cell foam. The former are usually prepared from thermoplastic polyimide resins, while the latter are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10C08J9/04C08L79/08
CPCC08G73/1039C08G73/1064C08G73/1067C08G73/1071C08J9/04C08J2379/08
Inventor 许云汉胡爱军杨士勇
Owner INST OF CHEM CHINESE ACAD OF SCI
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