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Space environment damage prevention protective coating as well as preparation method and application thereof

A protective coating and space environment technology, applied in coatings, anti-corrosion coatings, etc., can solve problems such as surface cracking, and achieve the effect of not easy to crack, low cost, and simple steps

Inactive Publication Date: 2015-08-12
JIANGXI SCI & TECH NORMAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the AO environment, the PSZ coating has better corrosion resistance than the general silicone coating, but the surface of the PSZ coating still has a certain tendency to crack

Method used

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  • Space environment damage prevention protective coating as well as preparation method and application thereof
  • Space environment damage prevention protective coating as well as preparation method and application thereof
  • Space environment damage prevention protective coating as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] First repeat the vacuum-pumping-nitrogen-filling operation of the reactor 3 to 5 times, then fill the entire reaction system with nitrogen at a rate of 1-10mL / s, open the nitrogen purge valve of the reactor, and make the nitrogen automatically overflow the reactor , to prevent air from entering; the tetrahydrofuran after dewatering was added to the above-mentioned reactor cooled with an ice-water bath, followed by methylvinyldichlorosilane, and then slowly passed NH at a flow rate of 50mL / min 3 , continuously stirred for 6 hours, then filtered and distilled under reduced pressure to obtain a colorless, viscous, colloidal polysilazane precursor; the polysilazane precursor was dissolved in tetrahydrofuran or toluene, according to Si / Al moles Add aluminum isopropoxide in a ratio of 1:1, keep stirring at 150°C for 5 hours, filter and distill under reduced pressure to obtain a light yellow viscous liquid, that is, polyaluminosilazane polymer; polyaluminum is treated with tolu...

Embodiment 2

[0036] First, repeat the operation of vacuum-pumping and nitrogen-filling the reactor for 3 to 5 times; then fill the entire reaction system with nitrogen at a rate of 1-10mL / s, and open the nitrogen vent valve of the reactor, so that the nitrogen automatically overflows the reactor , to prevent air from entering; the tetrahydrofuran after dewatering was added to the above-mentioned reactor cooled with an ice-water bath, followed by a mixture of methyldichlorosilane and methylvinyldichlorosilane, and then slowly passed through at a flow rate of 40mL / min into NH 3 , stirred continuously for 10 hours, then filtered and distilled under reduced pressure to obtain a colorless, viscous, colloidal polysilazane precursor; dissolve the polysilazane precursor in tetrahydrofuran or toluene, according to the Si / Al molar ratio Add aluminum isopropoxide at 0.5:1 and stir continuously for 48 hours at 90°C, filter and distill under reduced pressure to obtain a light yellow viscous liquid, tha...

Embodiment 3

[0038] First, repeat the vacuum-pumping-nitrogen-filling operation of the reactor for 3 to 5 times; then fill the entire reaction system with nitrogen at a rate of 1-10mL / s, open the nitrogen purge valve of the reactor, and make the nitrogen automatically overflow the reactor , to prevent air from entering; the tetrahydrofuran after dewatering was added to the above reactor cooled with an ice-water bath, followed by a mixture of methyldichlorosilane and methylvinyldichlorosilane, and then slowly at a flow rate of 30mL / min Access to NH 3 , stirred continuously for 12 hours, then filtered and distilled under reduced pressure to obtain a colorless, viscous, colloidal polysilazane precursor; dissolve the polysilazane precursor in tetrahydrofuran or toluene, according to the Si / Al molar ratio Add aluminum isopropoxide in 5:1 and keep stirring at 100°C for 24h, filter and distill under reduced pressure to obtain a light yellow viscous liquid, that is, polyaluminosilazane polymer. D...

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Abstract

The invention provides a method for preparing a space environment damage prevention protective coating. The method comprises the following steps: preparing polysilazane from organochlorosilane and an ammonia gas through reaction, enabling polysilazane and aluminum isopropoxide to react to prepare a polyaluminum chloride silazane polymer, coating the polyaluminum chloride silazane polymer on the surface of a space material, and curing, thereby obtaining the coating resistant to elemental oxygen corrosion. The protective coating prepared by using the method is applicable to an external material which is sensitive to near-earth orbit elemental oxygen corrosion on space aircrafts. By adopting the method for preparing the space environment damage prevention protective coating, the corrosion resistance of the protective coating to the near-earth orbit elemental oxygen corrosion is improved, and meanwhile the tendency that an organic silicon coating has cracks in the ceramic conversion process can be inhibited.

Description

technical field [0001] The invention belongs to the technical field of material engineering, and particularly relates to a protective coating against damage to a space environment and a preparation method and application thereof. Background technique [0002] With the development of aerospace technology, the time of spacecraft operation in space is gradually extended, and the erosion effect of space environment on spacecraft is increasingly prominent. Atomic oxygen (AO) is the most dominant environmental factor in low Earth orbit (LEO) space. High-throughput, high-energy, high-activity AO collides with the surface of the orbiting spacecraft, causing oxidation and erosion, causing material quality loss, resulting in premature degradation of material properties and failure. For example, the polyimide (PI) film used as the substrate of solar panels will form a carpet-like morphology on the surface due to AO ablation, resulting in the degradation of optical, thermal and mechani...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/16C09D5/08C08G77/62
Inventor 多树旺刘庭芝张豪常豫川赵莉曼胡亮
Owner JIANGXI SCI & TECH NORMAL UNIV
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