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Preparation method of aerospace hyperbranched polysiloxane polyimide transparent hybrid thin films

A technology of polysiloxane polyimide and film, which is applied in the field of preparation of hyperbranched polysiloxane polyimide transparent hybrid film for space, can solve the problem that the uniformity of coating thickness is difficult to be effectively controlled, The expansion and shrinkage of the adhesion interface is not uniform, and the coating cannot be guaranteed to be intact, etc., to achieve the effect of low preparation cost, conducive to large-scale industrial production, and excellent intrinsic anti-atomic oxygen performance

Active Publication Date: 2013-12-11
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, the coating process requires special equipment and is limited by the size and shape of the film; secondly, the uniformity of coating thickness is difficult to be effectively controlled during the coating process, and it is difficult to achieve large-scale production, manual operation, storage, loading, and The integrity of the coating cannot be guaranteed under the collision of high-altitude particles; again, the coating material and the base material have different thermal expansion coefficients. When the temperature changes, the adhesion interface will expand and shrink unevenly, resulting in internal stress, fracture, and delamination. , seriously affecting the overall performance of the material

Method used

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  • Preparation method of aerospace hyperbranched polysiloxane polyimide transparent hybrid thin films
  • Preparation method of aerospace hyperbranched polysiloxane polyimide transparent hybrid thin films
  • Preparation method of aerospace hyperbranched polysiloxane polyimide transparent hybrid thin films

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Example 1: Add 35g N,N-dimethylacetamide (DMAc), 19.83g phenyltrimethoxysilane and 0.38g aminopropylmethyldiethoxysilane to a container equipped with a magnetic stirrer in sequence , And start stirring at the same time to cool down the system. When the temperature dropped to 5°C, 5.5 g of distilled water was dropped into the system within 1 hour. Keep the reaction conditions unchanged, continue to stir for 1 hour, raise the temperature to 50°C, and stir for 3 hours. After the reaction is completed, the temperature is controlled at 65° C. and the pressure is -0.075 MPa by rotary evaporation. The small molecule volatiles generated by the reaction are removed to obtain HBPSi with an amino group content of 0.16 mmol / g.

Embodiment 2

[0034] Example 2: Add 20g of N,N-dimethylformamide (DMF), 24.04g of phenyltriethoxysilane and 0.76g of aminopropylmethyldiethoxy to a container equipped with a magnetic stirrer. Silane, while stirring and cooling the system. When the temperature dropped to 6°C, 6g of distilled water was dropped into the system within 1h. Keep the reaction conditions unchanged, continue to stir for 1 hour, raise the temperature to 50°C, and stir for 3 hours. After the reaction is completed, the temperature is controlled at 70° C. and the pressure is -0.075 MPa by rotary evaporation. The small molecule volatiles generated by the reaction are removed to obtain HBPSi with an amino group content of 0.32 mmol / g.

Embodiment 3

[0035] Example 3: Add 22g DMAc, 19.83g phenyltrimethoxysilane and 1.15g aminopropylmethyldimethoxysilane to a container equipped with a magnetic stirrer in sequence, and start stirring at the same time to cool the system. When the temperature dropped to 4°C, 4.8 g of distilled water was dropped into the system within 1 hour. Keep the reaction conditions unchanged, continue to stir for 1 hour, raise the temperature to 50°C, and stir for 3 hours. After the reaction is completed, the temperature is controlled at 60° C. and the pressure is -0.075 MPa by rotary evaporation. The small molecule volatiles generated by the reaction are removed to obtain HBPSi with an amino group content of 0.46 mmol / g.

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Abstract

The invention provides a preparation method of aerospace hyperbranched polysiloxane polyimide transparent hybrid thin films. The method comprises the following steps: carrying out hydrolytic condensation on two monomers: phenyl-containing silane and aminopropyl-containing silane in a strong polar aprotic solvent system; vacuumizing to remove micromolecular volatile matters generated by the reaction to obtain amino-containing hyperbranched polysiloxane; modifying a polyimide material by the amino-containing hyperbranched polysiloxane to prepare polyimide containing an HBPSi (Hyperbranched Polysiloxane) structure; and through thermal imidization, obtaining a series of hyperbranched polysiloxane polyimide transparent hybrid thin films (HBPSI-PI). The reaction condition for synthesizing the HBPSi is mild and the cost is low. Furthermore, the HBPSi structure is finally introduced to main chains of polyimide molecules by way of chemical bonds, so that the material is endowed with excellent intrinsic atomic oxygen resistance and good light permeability. The HBPSi-PI hybrid thin films are excellent in comprehensive performance, low in preparation cost, and suitable for industrial production.

Description

Technical field [0001] The invention relates to a method for preparing a transparent hybrid film of hyperbranched polysiloxane polyimide for space use, and relates to the preparation of an amino group-containing hyperbranched polysiloxane (HBPSi) and a space antigen oxygen polysiloxane containing a HBPSi structure. Preparation method of imide transparent hybrid film. Background technique [0002] With the rapid development of science and technology, all countries are striving to expand their space fields. The development of space technology places more and more demands on materials. For a spacecraft to operate in a low-earth orbit (LEO) environment with high atomic oxygen (AO) content without being damaged, it must have excellent antigenic oxygen performance. Polyimide (PI) as an engineering material with excellent comprehensive performance has a wide range of uses in the aerospace field, but the erosion of AO greatly reduces the service life of unmodified PI, so it is necessar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L79/08C08G73/10C08G77/26
Inventor 张秋禹雷星锋张和鹏陈营姚盼孙婉露
Owner NORTHWESTERN POLYTECHNICAL UNIV
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