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A double-layer structure polyimide composite material with extreme environmental resistance and its preparation method

A double-layer structure, polyimide technology, applied in the field of material chemistry, can solve the problems of insufficient high temperature stability, insufficient mechanical properties, weak anti-ultraviolet radiation performance, etc.

Active Publication Date: 2021-03-09
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current polyimide composite membrane materials often have shortcomings such as insufficient mechanical properties, insufficient anti-anti-oxidation performance, weak anti-ultraviolet radiation performance, and insufficient high-temperature stability.

Method used

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  • A double-layer structure polyimide composite material with extreme environmental resistance and its preparation method
  • A double-layer structure polyimide composite material with extreme environmental resistance and its preparation method
  • A double-layer structure polyimide composite material with extreme environmental resistance and its preparation method

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preparation example Construction

[0038] The invention provides a method for preparing a double-layer structure polyimide composite material with extreme environmental tolerance, comprising the following steps:

[0039] S1) Carry out calcination, acid leaching and sodium treatment on the mica powder, then use small organic molecules to intercalate the mica powder, and then disperse the intercalated mica powder in a solvent for ultrasonic crushing to obtain a suspension of mica nanosheets ;

[0040]S2) Mix the mica nanosheet suspension with the polyamic acid solution to obtain the mica nanosheet-polyamic acid dispersion; It is a low-concentration mica nanosheet-polyamic acid dispersion; 60wt%-80wt% mica nanosheet-polyamic acid dispersion is recorded as a high-concentration mica nanosheet-polyamic acid dispersion;

[0041] S3) Using the combined method of spraying assembly and thermal curing, spray the low-concentration mica nanosheet-polyamic acid dispersion and the high-concentration mica nanosheet-polyamic a...

Embodiment 1

[0074] Preparation of double-layer polyimide composites:

[0075] a. First, put the mica powder into the electric furnace at a heating rate of 5°C / min to 800°C and keep it warm for 1 hour; then, take 15g of calcined mica powder and add it to 500mL of 5mol / L nitric acid solution at 95°C React for 5h, filter, wash, and dry; then, take 15g of acid-leached mica powder, add it to 500mL of 40wt.% sodium chloride solution, react for 3h at 95°C, filter, wash, and dry; then, take Add 5g of sodium mica powder and 15g of cetyltrimethylammonium chloride into 500mL of deionized water and react at 80°C for 24 hours, filter, wash, and dry; finally, take 20g of intercalated mica powder and add into 500mL of ethanol, under the condition of magnetic stirring, adopt 665W power to sonicate and collect the supernatant suspension by centrifuging at 3000r / min for 10min every 0.5h to obtain mica nanosheet suspension. figure 2 It is an atomic force microscope photo of mica nanosheets in Example 1 of...

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Abstract

The invention provides a method for preparing a double-layer structure polyimide composite material, comprising: S1) calcining, acid leaching and sodiumizing mica powder, then using small organic molecules to intercalate the mica powder, and then Ultrasonic crushing is carried out in the solvent to obtain a suspension of mica nanosheets; S2) mixing the suspension of mica nanosheets with a polyamic acid solution to obtain a dispersion of mica nanosheets-polyamic acid; according to the content of mica nanosheets, 5wt %‑30wt% mica nanosheet‑polyamic acid dispersion is recorded as low concentration mica nanosheet‑polyamic acid dispersion; 60wt%‑80wt% mica nanosheet‑polyamic acid dispersion is recorded as high concentration mica nanosheet‑polyamic acid dispersion Polyamic acid dispersion; S3) Spraying assembly and thermal curing combined method, sequentially spraying low-concentration mica nanosheet-polyamic acid dispersion and high-concentration mica nanosheet-polyamic acid dispersion on the surface of the substrate to obtain a double layer Structural polyimide composite.

Description

technical field [0001] The invention relates to the technical field of material chemistry, in particular to a double-layer polyimide composite material with extreme environmental tolerance and a preparation method thereof. Background technique [0002] Polyimide is a very practical engineering polymer material with excellent mechanical properties, excellent thermal stability, inherent chemical resistance stability and outstanding dielectric properties, and is widely used in microelectronics and aerospace, etc. industry. In particular, polyimide has been used as the outer material of aerospace thermal insulation blankets to protect spacecraft from the adverse environment of low orbit (atomic oxygen, ultraviolet rays, extreme temperatures and space debris, etc.). Although polyimide has excellent overall properties, it is very sensitive to the attack of atomic oxygen like hydrocarbon polymers. After atomic oxygen radiation, the mechanical properties and service life of polyim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/04C08J5/18C08L79/08C08K9/04C08K9/02C08K3/34C08K7/00C09D179/08C09D7/62
CPCC08J5/18C08J2379/08C08J2479/08C08K3/34C08K7/00C08K9/02C08K9/04C08K2201/011C08L2201/08C09D179/08C09D7/62C09D7/70C08J7/0427
Inventor 俞书宏潘晓锋高怀岭
Owner UNIV OF SCI & TECH OF CHINA
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