有机硅微胶囊-有机硅树脂复合涂层对空间Kapton的原子氧防护

Atomic oxygen erosion resistance of microcapsules-silicone coatings on Kapton

将采用水相分离法制备的以明胶为囊壁、有机硅为囊芯的微胶囊与有机硅树脂乳液在一定条件下混合,在聚酰亚胺薄膜(Kapton)基材表面制备出含有机硅树脂的微胶囊-有机硅复合涂层,并将所制备的涂层分别进行原子氧暴露试验。结果表明,原子氧对Kapton侵蚀严重,质量损失严重,由原来光滑平整的表面变为凹凸不平的地毯状,太阳光吸收率变化值Δα为0.272。微胶囊-有机硅复合涂层对Kapton基体优良的保护作用,使试样的质量损失和剥蚀率明显下降,且Δα仅为0.071。尤其是微胶囊与有机硅质量比为1∶5的涂层,质量损失为Kapton试样的2.3%。

Microcapsules with gelatin as wall material and silicone resin as core material were prepared by means of separation in water phase. Microcapsulessilicone coatings of atomic oxygen （AO） resistant was prepared by Czochralski method on the surface of Kapton. The erosion behaviors of Kapton without and with microcapsulessilicone coatings were studied during exposure in AO environment in ground-based simulation facilities. The results indicate that the Kapton undergoes dramatical degradation with an obvious mass loss and change of surface morphologies. The optical properties of Kapton also significantly degenerate with a solar absorption rate changing of 0. 272 before and after AO exposure. The microcapsulessilicone coatings posses a good performance on the AO resistant with less mass loss and erosion rate and the Δα is only 0. 071. Specially, the mass loss of the coating, whose mass ratio of microeapsules to silicone is 1：5, decreases to 2.3% of the uncoated Kapton.