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Low sunlight absorptivity alumina-potassium silicate paintcoat for heat control and its preparing method

A technology of solar absorptivity and thermal control coating, applied in the direction of coating, etc., can solve the problems of lack of thermal control effect, accelerated corrosion and degradation of surface materials, poor adaptability of substrates, etc., and achieves a significant effect of resisting atomic oxygen erosion , low solar absorption rate, and stable space behavior

Inactive Publication Date: 2004-03-10
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after a large number of experiments, we found that inorganic coatings purely bonded with silicate have defects such as poor leveling, brittle, porous coating films, and poor adaptability to substrate volume changes.
After this kind of coating is impacted and eroded by atomic oxygen and other high-energy particles in the space environment, the coating is easy to fall off, which accelerates the corrosion and degradation of the surface material, and does not achieve thermal control effect.

Method used

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  • Low sunlight absorptivity alumina-potassium silicate paintcoat for heat control and its preparing method
  • Low sunlight absorptivity alumina-potassium silicate paintcoat for heat control and its preparing method
  • Low sunlight absorptivity alumina-potassium silicate paintcoat for heat control and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Put 70g of potassium silicate and 200g of water into the mixing tank, start the mixer and stir evenly, then add 1g of stabilizer diethanolamine and stir evenly. Dilute the industrial sulfuric acid into 10% dilute sulfuric acid, slowly add it into the stirring tank, and control the pH within the range of 11-13 to obtain the acidic modified water glass base material. Sodium hexametaphosphate 0.5g is dissolved into 10% aqueous solution and dropped in the stirring tank, then drops into OP emulsifier 0.5g, defoamer tri-n-butyl phosphate 0.5g (purchased from Germany Bayer company, its product model is 5500) and 1 g of dispersant alkaryl polyether alcohol (purchased from Union carbide, namely 466 type dispersant) were stirred evenly. 10g of light calcium carbonate, 30g of heavy calcium carbonate, 10g of talc powder, 10g of mica powder and 140g of alumina powder were put into a tank for dispersion and ground by a ball mill to make a slurry. When in use, add phenylacrylic acid ...

Embodiment 2

[0034] Take 86g of potassium silicate and 200g of water and put them into the mixing tank, start the mixer and stir evenly, then add 1.5g of stabilizer diethanolamine and stir evenly. Dilute the industrial sulfuric acid into 10% dilute sulfuric acid, slowly add it into the stirring tank, and control the pH within the range of 11-13 to obtain the acidic modified water glass base material. Dissolve 1g of sodium hexametaphosphate into a 10% aqueous solution and put it into the stirring tank, then add 1g of OP emulsifier, 1g of 5500-type defoamer tri-n-butyl phosphate and 466-type dispersant of alkaryl polyether alcohol 2g and stir well. 20g of light calcium carbonate, 40g of heavy calcium carbonate, 16g of talc powder, 16g of mica powder and 168g of alumina powder were put into a tank for dispersion and ground by a ball mill to make a slurry. When in use, add phenylacrylic acid emulsion at a ratio of 1:0.6 (slurry: styrene-acrylic emulsion), and keep the mixed slurry in a fully ...

Embodiment 3

[0036]Take 105 g of potassium silicate and 200 g of water and put them into a mixing tank, start the mixer and stir evenly, then add 2 g of stabilizer diethanolamine and stir evenly. Dilute the industrial sulfuric acid into 10% dilute sulfuric acid, slowly add it into the stirring tank, and control the pH within the range of 11-13 to obtain the acidic modified water glass base material. Dissolve 1g of sodium hexametaphosphate into a 10% aqueous solution and put it into the stirring tank, then add 2g of OP emulsifier, 1g of 5500-type defoamer tri-n-butyl phosphate and 466-type dispersant of alkaryl polyether alcohol 2g and stir well. Various filler light calcium carbonate 40g, heavy calcium carbonate 60g, talcum powder 5g, mica powder 5g and

[0037] Alumina powder 200 is put into a tank for dispersion and ground by a ball mill to make a slurry. When in use, add phenylacrylic acid emulsion at a ratio of 1:0.9 (slurry: styrene-acrylic emulsion), and keep the mixed slurry in a ...

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Abstract

A thermally controlled alumina-potassium silicate coating with low solar absorptivity for artificial satellite, space aircraft, etc is prepared from potassium silicate, diethanolamine, emulsifier, sodium hexametaphosphate, disperser, defoaming agent, light calcium carbonate, heavy calcium carbonate, talc power, mica powder, alumina powder and water through preparing slurry and proportionally mixing with phenylacrylic acid emulsion. Its advantages are high space stability, resistance to atomic oxygen corrosion, and thermal control effect, and low heat absorptivity.

Description

technical field [0001] The invention relates to a method for preparing a thermal control coating, which is used for low-earth orbit vehicles such as satellites, manned spacecraft, space stations, space shuttles and other spacecraft and various space probes, especially a low-solar Absorption rate (α s ) Al 2 o 3 - Preparation method of potassium silicate thermal control coating. Background technique [0002] With the continuous development of the aerospace industry, the temperature control of space vehicles has become a new system technology. Space vehicles (such as satellites and spacecraft) have high temperatures on the sunny side and low temperatures on the backside, with a temperature difference of hundreds of degrees. The substrates and equipment often cannot withstand such harsh temperature environment changes. Therefore, in order to ensure the normal operation of the space vehicle, it is necessary to carry out careful design and experiments on its thermal control s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D125/14
Inventor 张蕾严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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