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首页> 外文期刊>Journal of Applied Polymer Science >Antiadhesion elastomer seal coatings for UV and atomic oxygen protection
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Antiadhesion elastomer seal coatings for UV and atomic oxygen protection

机译：防粘弹性体密封涂料，可保护紫外线和原子氧

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Radiation blocking sunscreen coatings have been developed for the protection of elastomer seals used in low-Earth-orbit (LEO). The coatings protect the seals from ultraviolet (UV) radiation and atomic oxygen (AO) damage. The coatings were developed for use on NASA docking seals. Docking seal damage from the UV and AO present in LEO can constrain mission time-line, flight mode options, and increases risk. A low level of adhesion is also required for docking seals so undocking push-off forces can be low. The coatings presented also mitigate this unwanted adhesion. Greases with low collected volatile condensable materials (CVCM) and low total mass loss (TML) were mixed with slippery and/or UV blocking powders to create the protective coatings. Coatings were applied at rates up to 2 mg/cm(2). Coated seals were exposed to AO and UV in the NUV (near-UV) and UV-C wavelength ranges (300 to 400 nm and 254 nm, respectively). Ground based ashers were used to simulate the AO of space. The Sun's UV energy was mimicked assuming a nose forward flight mode, resulting in an exposure rate of 2.5 MJ/m(2) day. Exposures between 0 and 147 MJ/m(2) (UV-C) and 245 MJ/m(2) (NUV) were accomplished. The protective coatings were durable, providing protection from UV after a simulated docking and undocking cycle. The level of protection begins to decline at coverage rates less than 0.9 mg/cm(2). The leakage of seals coated with Braycote+20%Z-cote ZnO sunscreen increased by a factor of 40 after moderate AO exposure; indicating that this coating might not be suitable due to AO intolerance. Seals coated with DC-7-16.4%Z-cote ZnO sunscreen were not significantly affected by combined doses of 2x10(21) atoms/cm(2) AO with 73 MJ/m(2) UV-C. Unprotected seals were significantly damaged at UV-C exposures of 0.3 MJ/m(2) and DC-7-16.4%Z-cote coated seals were undamaged at all exposures up to the limits tested thus far which were 147 MJ/m(2) UV-C and 245 MJ/m(2) NUV. The coatings decreased adhesion sufficiently for docking seals at temperatures equal to or greater than -8 degrees C thus offer a simple and inexpensive way to mitigate adhesion. (c) 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41662.
机译：已开发出防辐射防晒涂料，用于保护低地球轨道（LEO）中使用的弹性体密封件。该涂层可保护密封件免受紫外线（UV）辐射和原子氧（AO）的损害。涂层被开发用于NASA对接密封件。 LEO中存在的UV和AO对接密封件损坏会限制任务时间表，飞行模式选项并增加风险。对接密封件还需要低水平的粘附力，因此，对接推压力可能很小。所提供的涂层也减轻了这种不希望的粘附。将具有低收集的挥发性可冷凝物质（CVCM）和低总质量损失（TML）的油脂与光滑和/或UV阻挡粉末混合，以形成保护涂层。涂料的涂覆速率最高为2 mg / cm（2）。将涂有涂层的密封条暴露在NUV（近UV）和UV-C波长范围（分别为300至400 nm和254 nm）中的AO和UV中。使用基于地面的灰烬来模拟空间的AO。假定鼻子向前飞行，模拟了太阳的紫外线能量，导致暴露速度为2.5 MJ / m（2）天。完成了0到147 MJ / m（2）（UV-C）和245 MJ / m（2）（NUV）之间的曝光。保护性涂层是耐用的，在经过模拟的对接和对接后，可提供防紫外线保护。当覆盖率小于0.9 mg / cm（2）时，保护水平开始下降。中度AO暴露后，涂有Braycote + 20％Z-cote ZnO防晒霜的密封件的泄漏增加了40倍;表示此涂层可能由于AO不耐受而不合适。密封剂涂有DC-7-16.4％Z-cote ZnO防晒霜不受2x10（21）atoms / cm（2）AO与73 MJ / m（2）UV-C的联合剂量的影响。未经保护的密封件在UV-C暴露量为0.3 MJ / m（2）时会受到严重破坏，并且DC-7-16.4％Z-cote涂层的密封件在所有暴露量（直至到目前为止测试的极限值147 MJ / m（2））下均不受损坏。 ）UV-C和245 MJ / m（2）NUV。涂层降低的粘附力足以在等于或大于-8摄氏度的温度下对接密封件，因此提供了一种简单而廉价的减轻粘附力的方法。 （c）2014 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，41662。

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