Coating with three functions of stray light elimination, molecular adsorption and thermal control as well as preparation method and application of coating

Abstract

The invention relates to the technical field of surface engineering, and discloses a coating with three functions of stray light elimination, molecular adsorption and thermal control as well as a preparation method and application of the coating. The coating comprises carbon black, a zeolite molecular sieve and aluminum dihydrogen phosphate. The invention provides a coating with stray light elimination, molecular adsorption and thermal control functions, which takes carbon black, a zeolite molecular sieve and aluminum dihydrogen phosphate as raw materials, the highest solar absorption ratio of a coating formed by the coating is greater than 0.98, the hemispherical emissivity can reach 0.89-0.92, and the saturated adsorption capacity can reach 50-95 mg / g; meanwhile, along with the continuous increase of the absorption amount of molecular pollutants, the solar absorption ratio is only slightly reduced, and the hemispherical emissivity is basically unchanged. In addition, the preparation method of the coating is simple and easy to implement, and industrial preparation is easy.

Description

technical field [0001] The present application relates to the technical field of surface engineering, in particular to a three-functional coating of stray light elimination-molecular adsorption-thermal control and its preparation method and application. Background technique [0002] In aerospace applications, molecular pollutants released by organic materials in a vacuum environment pose a major threat to the efficiency and lifespan of precision electronic and optical instruments in spacecraft. At the same time, some aerospace products, such as cameras, telescopes, and laser systems, require high absorption characteristics and control of stray light characteristics in the near-infrared range. Stray light is the cause of decreased contrast and image quality and increased noise in optical systems. Molecular pollutants are more sensitive, and there is a greater need to reduce the effects of molecular pollutants. [0003] Patent CN202011357112.4 discloses an organic black molec...

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Problems solved by technology

[0003] Patent CN202011357112.4 discloses an organic black molecular absorption coating. The coating in its specific embodiment is made of carbon black, 13X type zeolite molecular sieve and cyanate resin, and its molecular adsorption effect is poor. The saturated adsorption capacity of pollutants is only 17.58mg / g, and the organic resin contained in the organic coating itself will produce molecular pollutants in the vacuum environment of the space, which further affects the overall adsorption effect of the coating

At the same time, as the coating continues to adsorb molecular pollutants, the performance of this organic black molecular absorbing coating for eliminating stray light is affected

In addition, the coating slurry preparation process of this patent is relatively complicated, and carbon black and zeolite molecular sieves need to be pretreated, followed by the atomic layer periodic precipitation growth process and the addition of accelerators, coupling agents and ultra-black powders. No advantage in time-consuming and cost

[0004] Patent US2018051177A1 discloses an inorganic black molecular absorption coating. The filler used in the coating in the specific embodiment is 13X zeolite and bone char, and the binder is AS-30 silica sol. The binder forms a three-dimensional network coating structure It shows that the coating adhesion is average, and it is impossible to use a higher filler ratio to improve the adsorption capacity of the coating, otherwise the coating will be pulverized and the film-forming property is poor. At the same time, the coating is sprayed on the surface of the epoxy coating, and the thickness can only be 60~ 70μm, the lower thickness further reduces the molecular adsorption capacity of the coating, only 0.6mg / cm 2

The multi-layer structure that needs to build up the primer layer is also not advantageous in terms of time consumption and cost

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