CN111393882A - Ultraviolet radiation resistant low-absorptivity inorganic white thermal control coating and preparation method thereof - Google Patents
Ultraviolet radiation resistant low-absorptivity inorganic white thermal control coating and preparation method thereof Download PDFInfo
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- CN111393882A CN111393882A CN202010212002.2A CN202010212002A CN111393882A CN 111393882 A CN111393882 A CN 111393882A CN 202010212002 A CN202010212002 A CN 202010212002A CN 111393882 A CN111393882 A CN 111393882A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
- C09D1/02—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances alkali metal silicates
- C09D1/04—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances alkali metal silicates with organic additives
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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Abstract
The invention discloses an ultraviolet radiation resistant low-absorptivity inorganic white thermal control coating and a preparation method thereof. The invention aims to solve the problem that the conventional inorganic white paint thermal control coating has larger degradation on the photo-thermal performance under the action of space ultraviolet irradiation. The thermal control coating comprises the following components: water glass, white pigment, a dispersing agent, a base material wetting agent, a defoaming agent, a thickening agent and the balance of deionized water. The coating can be prepared by dispersing for 2-6 hours by adopting a sand milling process, and then the coating can be prepared by adopting coating processes such as air spraying, brushing or blade coating. The solar absorption ratio of the coating is 0.11-0.20, the adhesive force is 0-1 grade, and after the ultraviolet radiation resistant 5000ESH coating is adopted, the solar absorption ratio change value is not more than 0.05, so that the performance requirements of high-performance and high-reliability spacecrafts on thermal control coatings are met.
Description
Technical Field
The invention belongs to the technical field of functional coatings, and particularly relates to an ultraviolet irradiation resistant low-absorptivity inorganic white thermal control coating and a preparation method thereof.
Background
Space is a high vacuum environment and heat exchange between the spacecraft and the external space is mainly carried out in the form of thermal radiation. The spacecraft which runs in the space environment is easy to generate high temperature due to solar radiation to influence the running of each component and equipment in the spacecraft, so the thermophysical property of the structural part or the equipment surface of the spacecraft plays a decisive role in the radiation heat exchange state. The function of the thermal control design is to select the coating reasonably and organize the heat exchange paths, processes and heat exchange quantities of the inner and outer surfaces of the spacecraft, so that the equipment and the structure reach a balanced temperature, and the environmental temperature of each equipment is ensured to be within the operating temperature working interval of the equipment, so that each equipment can run normally.
The application of thermal control coating is a measure which is most widely, economically and simply applied in the thermal control system in the field of spacecraft, the thermal control coating mainly plays a role of passive temperature control to realize the heat exchange between the spacecraft and the space environment, and the photothermal property of the thermal control coating is mainly determined by the solar absorption ratio (α)s) And infrared emissivity () characteristics to regulate the temperature of the spacecraft surface. Generally, the smaller the solar absorption ratio, the larger the infrared emissivity, and the better the temperature control performance. Spacecraft operating in space environments are susceptible to high vacuum, charged particle irradiation, ultraviolet irradiation, atomic oxygen erosion, high and low temperature difference changes and the like, and the environments can affect the optical and thermal properties of a spacecraft surface coating. However, although the solar ultraviolet light accounts for a small proportion in the space environment, the irradiation has higher energy, and has stronger irradiation damage effect on the coating, so that the change of the optical performance of the white thermal control coating is larger. In the current research, the inorganic thermal control coating still has poor adhesive force and high solar absorption, and particularly, the photo-thermal performance of the coating is reduced more after ultraviolet irradiation.
Disclosure of Invention
The invention aims to provide an ultraviolet-resistant inorganic white thermal control coating with excellent photo-thermal performance; mainly solves the problem that the photo-thermal conversion performance of the existing inorganic white thermal control coating is reduced greatly under the action of space ultraviolet irradiation, and provides a preparation method of the inorganic white thermal control coating with excellent ultraviolet irradiation resistance and low solar absorption ratio.
In order to solve the technical problems, the ultraviolet radiation resistant low-absorptivity inorganic white thermal control coating is prepared from the following raw materials:
the preparation method of the ultraviolet radiation resistant low-absorptivity inorganic white thermal control coating is carried out according to the following steps:
step one, taking a thickening agent accounting for 42-46 wt% of the total mass of the thickening agent and a defoaming agent accounting for 42-46 wt% of the total mass of the defoaming agent, mixing the thickening agent and the defoaming agent with water glass, the defoaming agent, a dispersing agent and a base material wetting agent, stirring at the speed of 500-800 rpm for 10-30 min, adding a white pigment, and performing sand milling dispersion at the speed of 1200-1800 rpm for 2-6 h;
secondly, adding the rest of the thickening agent and the defoaming agent under the condition of low-speed stirring at 500-800 rpm, and stirring and dispersing for 10-30 min;
and thirdly, filtering the mixture by using a 200-300-mesh filter screen or filter cloth to obtain the inorganic thermal control coating.
And step four, coating the inorganic thermal control coating obtained in the step three on the surface of the base material polished by sand paper, and finally curing to obtain the inorganic white thermal control coating.
Further limit, the water glass is one or a mixture of potassium water glass, sodium water glass and lithium water glass according to any ratio.
Further limiting, the potassium water glass is prepared from potassium silicate, potassium hydroxide and water according to the mass ratio of (5-10) to (0.2-1) to 20; the sodium silicate is prepared from sodium silicate, sodium hydroxide and water according to the mass ratio of (5-10) to (0.2-1) to 20; the lithium water glass is prepared from lithium silicate, lithium hydroxide and water according to the mass ratio of (5-10): 0.2-1): 20.
Further, the pigment is one or a mixture of zinc oxide, titanium dioxide and zirconium dioxide in any ratio.
Further, the defoaming agent is polyoxypropylene glycerol ether and/or polyoxypropylene polyoxyethylene glycerol ether, and when the two are mixed, the polyoxypropylene glycerol ether and the polyoxypropylene polyoxyethylene glycerol ether are mixed according to any ratio.
Further defined, the dispersant is an alkylaryl polyether alcohol.
Further defined, the substrate wetting agent is a silicone polyether.
Further, the thickener is one of bentonite and nonionic polyurethane thickener.
Further, the base material in the fourth step is aluminum alloy, magnesium-lithium alloy or carbon fiber composite material.
And further limiting, in the fourth step, the inorganic thermal control coating obtained in the third step is coated by adopting an air spraying, blade coating or brush coating process.
Further defined, the curing is carried out at room temperature for 7 to 10 days in the fourth step.
The invention provides an inorganic white thermal control coating which is simple, convenient and easy to produce, is resistant to ultraviolet irradiation and low in volatility, when the coating thickness (dry film) of the thermal control coating prepared by the method is 80-150 mu m, the thermal control coating has a lower solar absorption ratio (0.11-0.20), the adhesive force is 0-1 grade, after 5000ESH ultraviolet irradiation, the solar absorption ratio change value of the coating is not more than 0.05, and the performance requirements of a high-performance and high-reliability spacecraft on the thermal control coating are met.
Drawings
FIG. 1 is a graph of solar spectral reflectance of an inorganic white thermal control coating;
FIG. 2 is an adhesion test optical photograph of an inorganic white thermal control coating;
fig. 3 shows the solar spectrum reflectivity of the inorganic white thermal control coating after 5000ESH ultraviolet irradiation.
Detailed Description
Example 1: in this embodiment, the inorganic thermal control coating is made of the following raw materials by mass percent: 20.8 wt% of potassium water glass, 28.9 wt% of zinc oxide pigment, 0.9 wt% of polyoxypropylene polyoxyethylene glycerol ether, 5.7 wt% of alkylaryl polyether alcohol, 0.3 wt% of silicone polyether, 3.6 wt% of nonionic polyurethane and the balance of water. Wherein the potassium silicate glass is obtained by mixing potassium silicate, potassium hydroxide and water according to the mass ratio of 8:0.5g: 20.
The preparation method of the inorganic thermal control coating taking the zinc oxide pigment as an example comprises the following specific steps:
first, 20.8 wt% of potash water glass, 0.4 wt% of defoaming agent polyoxypropylene polyoxyethylene glycerol ether (Wuhanneng Kenren pharmaceutical chemical Co., Ltd.), 5.7 wt% of dispersant alkylaryl polyether alcohol (Depines chemical Co., Ltd., Guangzhou, model 405), 0.3 wt% of base material wetting agent organosilicon polyether (break Tai chemical Co., Ltd., model 298) and 1.6 wt% of nonionic polyurethane thickener (break Tai chemical Co., Ltd., model TT935) were mixed with water, stirred at a low speed of 500rpm for 20min, then 28.9 wt% of zinc oxide (Allantin reagent Co., Ltd.) was added, and dispersed at a high speed of 1400rpm for 4 h.
Then under the low-speed stirring of 500rpm, 2.0 wt% of nonionic polyurethane thickener and 0.5 wt% of polyoxypropylene polyoxyethylene glycerol ether defoamer are dripped, stirred and dispersed for 20min, and filtered by 300-mesh filter cloth to obtain the coating. Preparing a coating on the surface of the aluminum alloy base material which is just polished by sand paper by adopting a blade coating process, and curing at room temperature for 10 days to obtain the inorganic thermal control coating. The thickness of the inorganic thermal control coating is measured to be 100 +/-5 mu m, the solar absorption ratio of the coating is 0.14, as shown in figure 1, and the adhesion is 1 grade, as shown in figure 2; after 5000ESH ultraviolet irradiation, the solar absorption ratio of the coating is 0.17, as shown in figure 3, and the performance requirements of the high-performance and high-reliability spacecraft on the thermal control coating are met.
Claims (10)
1. The inorganic white thermal control coating with ultraviolet radiation resistance and low absorptivity is characterized by being prepared from the following raw materials in percentage by mass:
18 to 40 percent of water glass, 14 to 29 percent of white pigment, 0.9 to 5.7 percent of defoaming agent, 2.9 to 5.7 percent of dispersing agent, 0.2 to 0.6 percent of base material wetting agent, 2.1 to 3.6 percent of thickening agent and the balance of water.
2. The ultraviolet radiation resistant low-absorptivity inorganic white thermal control coating as claimed in claim 1, wherein the water glass is one or a mixture of potassium water glass, sodium water glass and lithium water glass in any ratio.
3. The inorganic white thermal control coating with ultraviolet radiation resistance and low absorptivity according to claim 2, characterized in that the potassium water glass is prepared by potassium silicate, potassium hydroxide and water according to the mass ratio of (5-10): (0.2-1): 20; the sodium water glass is prepared from sodium silicate, sodium hydroxide and water according to the mass ratio of (5-10) to (0.2-1) to 20; the lithium water glass is prepared from lithium silicate, lithium hydroxide and water according to the mass ratio of (5-10): 0.2-1): 20.
4. The ultraviolet radiation resistant low absorptivity inorganic white thermal control coating according to claim 1, wherein the pigment is one or a mixture of zinc oxide, titanium dioxide and zirconium dioxide in any ratio.
5. The ultraviolet radiation resistant low absorptivity inorganic white thermal control coating according to claim 1, wherein said defoaming agent is polyoxypropylene glycerol ether and/or polyoxypropylene polyoxyethylene glycerol ether.
6. The ultraviolet radiation resistant low absorptivity inorganic white thermal control coating according to claim 1, wherein said dispersant is an alkylaryl polyether alcohol.
7. The ultraviolet radiation resistant, low absorptivity inorganic white thermal control coating of claim 1, wherein said substrate wetting agent is a silicone polyether.
8. The ultraviolet radiation resistant low absorptivity inorganic white thermal control coating according to claim 1, wherein said thickener is one of bentonite and nonionic polyurethane thickener.
9. The method for preparing an inorganic white thermal control coating with ultraviolet radiation resistance and low absorptivity according to any one of claims 1-8, characterized in that the preparation method comprises the following steps:
step one, taking a thickening agent accounting for 42-46% of the total weight of the thickening agent and a defoaming agent accounting for 42-46% of the total weight of the defoaming agent, mixing the thickening agent with water glass, the defoaming agent, a dispersing agent and a base material wetting agent, stirring at the speed of 500-800 rpm for 10-30 min, adding a white pigment, and performing sand milling dispersion at the speed of 1200-1800 rpm for 2-6 h;
secondly, adding the rest of the thickening agent and the defoaming agent under the condition of low-speed stirring at 500-800 rpm, and stirring and dispersing for 10-30 min;
and thirdly, filtering with a 200-300-mesh filter screen or filter cloth to obtain the inorganic thermal control coating.
And step four, coating the inorganic thermal control coating obtained in the step three on the surface of the base material polished by sand paper, and finally curing to obtain the inorganic white thermal control coating.
10. The method for preparing the ultraviolet radiation resistant low-absorptivity inorganic white thermal control coating according to claim 9, wherein the base material in the fourth step is an aluminum alloy, a magnesium-lithium alloy or a carbon fiber composite material; coating the inorganic thermal control coating obtained in the third step by adopting an air spraying, blade coating or brush coating process; curing for 7-10 days at room temperature.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111893451A (en) * | 2020-08-13 | 2020-11-06 | 上海卫星工程研究所 | High-performance wave-transparent nano thermal control film for satellite, preparation method and application thereof |
| CN112480727A (en) * | 2020-11-26 | 2021-03-12 | 哈尔滨工业大学 | Preparation method of white molecular adsorption coating with thermal control function |
| CN114192363A (en) * | 2021-12-23 | 2022-03-18 | 上海卫星装备研究所 | Preparation method and system of solar absorption ratio adjustable thermal control coating and heat insulation assembly |
| US11407684B1 (en) * | 2021-04-06 | 2022-08-09 | Guangzhou University | Water-resistant long-acting inorganic zinc oxide super-hydrophilic paint, preparation method and application thereof |
| CN116082877A (en) * | 2022-12-29 | 2023-05-09 | 上海卫星装备研究所 | High-reflectivity filler and inorganic thermal control coating thereof and preparation method thereof |
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| CN111893451A (en) * | 2020-08-13 | 2020-11-06 | 上海卫星工程研究所 | High-performance wave-transparent nano thermal control film for satellite, preparation method and application thereof |
| CN112480727A (en) * | 2020-11-26 | 2021-03-12 | 哈尔滨工业大学 | Preparation method of white molecular adsorption coating with thermal control function |
| US11407684B1 (en) * | 2021-04-06 | 2022-08-09 | Guangzhou University | Water-resistant long-acting inorganic zinc oxide super-hydrophilic paint, preparation method and application thereof |
| CN114192363A (en) * | 2021-12-23 | 2022-03-18 | 上海卫星装备研究所 | Preparation method and system of solar absorption ratio adjustable thermal control coating and heat insulation assembly |
| CN116082877A (en) * | 2022-12-29 | 2023-05-09 | 上海卫星装备研究所 | High-reflectivity filler and inorganic thermal control coating thereof and preparation method thereof |
| CN116082877B (en) * | 2022-12-29 | 2024-04-09 | 上海卫星装备研究所 | High-reflectivity filler and inorganic thermal control coating thereof and preparation method thereof |
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