Novel antistatic white thermal control coating and preparation method thereof

Abstract

The invention discloses a novel antistatic white thermal control coating and a preparation method thereof; wherein the coating, from interior to exterior, comprises a surface treatment agent layer, a prime coat layer and a finishing coat layer; the prime coat layer and the finishing coat layer all use room temperature curing type organic silicone resin as a matrix resin; a plurality of sheet-shaped metal powders are crossedly overlapped and arranged in the prime coat layer, and one ends of part of the sheet-shaped metal powders extend to the finishing coat layer; and white zinc oxide is distributed in the finishing coat layer. The coating provided by the invention is white, thickness is 100-140mum, solar absorptance is 0.24-0.29, hemispherical emissivity is 0.85-0.91, total mass loss TML is less than 1%, a collected volatile condensable material CVCM is less than 0.1%, and volume resistivity rhoV is not less than 107 ohm*m. The coating, through 100 times of high and low temperature heat cycle test in a temperature range from -100 to 100 DEG C, has advantages of non-cracking, non-spalling, non-foaming and non-discoloring phenomena, stable optical property and good adhesion force, and can basically satisfy demand of a spacecraft on the antistatic white thermal control coating.

Description

technical field [0001] The invention relates to the technical field of aircraft thermal control materials, in particular to a novel antistatic white thermal control coating and a preparation method thereof. Background technique [0002] Thermal control coating is an important part of the passive thermal control system of spacecraft. When the spacecraft is exposed to sunlight for a long time or operates in space where sunlight cannot reach, it can maintain The balance of energy absorption and radiation on the outer surface allows the spacecraft to achieve the ideal operating temperature. Therefore, almost every outer surface of a spacecraft needs to be coated with a thermal control coating to ensure the safety of the star and the normal operation of the instruments in the star. [0003] During the in-orbit service of the spacecraft, the surface materials are subjected to various extremely harsh and complex conditions such as solar electromagnetic rays, charged particles such...

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Problems solved by technology

[0004] At present, the volume resistivity of thermal control coatings for domestic spacecraft, especially the white thermal control coatings used on the outer side of spacecraft, does not reach the level of antistatic coating ρ V ≤10 7 The index of Ω·m and the high resistivity make the thermal control coatings currently developed cannot be used normally.

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