A kind of colorless transparent polyimide film aluminized thermal control coating and preparation method thereof
A technology of transparent polyimide and thermal control coating, which is applied in coating, metal material coating process, sputtering plating, etc., can solve the problems of good heat dissipation performance, low theoretical equilibrium temperature, and low absorption-radiation ratio , to achieve good heat dissipation and heat preservation performance, moderate theoretical equilibrium temperature, and improved reliability
Active Publication Date: 2019-06-18
SHANGHAI INST OF SATELLITE EQUIP
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is: the existing F46 / Ag flexible thermal control composite coating material has selected the F46 film with high transmittance in the visible light band as the base material, and selected the reflectance in the visible light band and the infrared band Metal silver with a high average value is used as the coating material, and most of the sunlight irradiated on the surface of the material is reflected. Therefore, the F46 / Ag flexible thermal control composite coating material is used as a secondary surface mirror, and its absorption-radiation ratio is as low as 0.1 (belonging to low absorption-radiation ratio), good heat dissipation performance, and low theoretical equilibrium temperature
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[0021] The structure and preparation process of a colorless PI / Al flexible thermal control composite coating material will be further described below with reference to the description of the drawings and specific embodiments.
[0022] in: figure 1 It is a schematic structural diagram of a colorless PI / Al flexible thermal control composite coating material. The reason why the colorless PI film is selected as the substrate 1 is that the thermal emissivity of the PI film is relatively large. Compared with golden yellow PI, colorless PI has higher transmittance and lower absorption. The reason for choosing aluminum as the reflective layer 2 is that the reflectivity of aluminum in the whole band is high. When encountering dry air, the aluminum surface can be self-passivated to form a dense aluminum oxide layer as the protective layer 3 to protect the aluminum in the inner layer from oxidation.
[0023] The preparation process of the colorless PI / Al flexible thermal control compos...
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Abstract
The invention relates to a colorless and transparent thermal-control coating with an aluminum-plated polyimide film. The colorless and transparent thermal-control coating is characterized in that since the ratio between solar absorptance (alphas) and heat radiation rate (epsilonH) is 0.3, and the thermal-control coating belongs to a thermal-control coating material for a secondary surface mirror and with medium radiation absorptance. The balance temperature of the surface of a thermally-radiated object without internal heat sources in a vacuum environment mainly depends on the radiation absorptance of the surface of the object, and currently, flexible thermal-control coatings for regulating the temperature of the surface of the thermally-radiated object only include a low-radiation-absorptance (alphas / epsilonH=0.1) flexible thermal-control coating with a silver-plated F46 film (hereinafter referred to as 'F46 / Ag') and a high-radiation-absorptance (alphas / epsilonH=0.6) flexible thermal-control coating with an aluminum-plated polyimide film (golden and transparent) (hereinafter referred to as 'golden PI / Al'). The colorless and transparent thermal-control coating has the advantages that not only is the variety of the flexible thermal-control coating materials enriched and is the blank between 0.1 and 0.6 is filled, but also the design redundancy of a thermal-control system can be reduced.
Description
technical field [0001] The invention belongs to the field of new materials, and in particular relates to a colorless transparent polyimide film aluminized thermal control coating and a preparation method thereof. Background technique [0002] Flexible thermal control coating is a kind of flexible thermal control composite coating material made by continuously depositing a large area of highly reflective metal film on a flexible and transparent substrate by means of physical vapor deposition. Its biggest feature is that it can be selected by different Various types of flexible transparent substrates and highly reflective coating materials modulate the thermal radiation rate and solar absorption ratio respectively, and then modulate the radiation absorption ratio. [0003] The existing F46 / Ag is a flexible thermal control composite coating material with a low absorptive ratio made by continuously depositing a large area of highly reflective metal Ag film on a flexible and ...
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IPC IPC(8): C23C14/20C23C14/56C23C14/24
CPCC23C14/20C23C14/24C23C14/562
Inventor 倪俊范秋林李灿伦黄涛景加荣
Owner SHANGHAI INST OF SATELLITE EQUIP
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