92 results about "Solar absorptivity" patented technology

A reduced solar aborptivity appliqué having a surface layer for adhering to an surface and high aspect ratio microstructures extending from the surface layer having pigmentation or spectral tailoring.

The invention discloses a polyimide film and a preparation method and applications thereof. The compound forming the polyimide film is the compound of which structural general formula is shown in the formula I. The preparation method of polyimide is as follows: aromatic dianhydride 2,3,3',4'-diphenyl ether tetracarboxylic acid dianhydride (aODPA) and a series of aromatic diamine monomers are used as raw materials to prepare polyimide resin through chemical imidization. The polyimide film prepared by the technology has good optical transparency, low solar absorptivity-emissivity ratio and good thermal stability, and can be used to prepare the thermal protection device of the spacecraft, the solar cell array substrate and the antenna reflector/collector or solar sail and have important application value.

The invention provides a method for preparing a micro-arc oxidized coating with high solar absorptivity and high emissivity. The invention solves such a problem associated with prior Al-alloy coating that the solar-absorptivity, emissivity and bond, etc. can't meet the requirements from such fields as aerospace and decoration. The procedures are: placing a cleaned Al alloy in a stainless steel electrolytic tank as an anode, taking the stainless steel electrolytic tank as a cathode, supplying power by a pulse micro-arc oxidizing power supply, controlling the current density to be 0.5- 30A/dm<2>, positive voltage 240-1000 V, power supply frequency 50-3000 Hz, duty rate 10-50%, and controlling the electrolyte by a cooling circulating water to be no more than 30 DEG C, pH value of the electrolyte 8-12, carrying out micro-arc oxidization for 5-180 min., and then obtaining a ceramic coating. The invention reduces the cost and improves the product performance. The invention obtains a ceramic coating that has a solar absorptivity on Al alloy surface more than 0.90 and emissivity more than 0.80, in addition, the coating is of high hardness (more than 1000 Hv) and good bond with the substrate.

The invention provides a preparation method of an aluminum alloy surface conductive thermal control coating with low solar absorptivity and high emissivity, and relates to the preparation method of the aluminum alloy surface conductive thermal control coating. The preparation method aims at solving the technical problems that a conductive thermal control coating integrated film meeting the requirements of space ultraviolet radiation and electron radiation cannot be prepared with the existing aluminum alloy surface treatment technology. The method includes the steps of 1, surface pre-treatmentof an aluminum alloy part; 2, preparation of electrolyte; 3, pulse micro-arc oxidation; and 4, magnetron sputtering. The thickness of the prepared aluminum alloy surface conductive thermal control coating with low solar absorptivity and high emissivity is 20-100 micrometers, and the roughness of the prepared aluminum alloy surface conductive thermal control coating with low solar absorptivity andhigh emissivity is 2.0-12.0 micrometers; and the solar absorptivity is 0.35-0.42, the emissivity is 0.88-0.92, the value of alpha s/epsilon is about 0.4, the surface resistivity is 1*10<-5> Ohm.cm, the dual requirements of thermal control and static resistance of spacecrafts are met, and the conductive thermal control coating can be used for spacecraft structures.

The invention discloses a preparation method of a cellulose source carbon-based photothermal conversion material for sea water desalination, which comprises the following steps: mixing nanocellulose,a cell regulator, epoxy resin, polyamide resin and water, stirring to a uniform state, standing for degassing to obtain a homogeneous suspension, and carrying out directional freezing and drying to obtain a cellulose-based porous material; and performing carbonization treatment to obtain the cellulose source carbon-based photothermal conversion material for sea water desalination. According to theinvention, nanocellulose is used as a base material, epoxy resin and polyamide resin are used as adhesives, pores are generated after sublimation of ice crystals through freezing and drying, so thatthe cellulose source carbon-based photothermal conversion material has a rich porous network structure, multiple scattering of light rays in the cellulose source carbon-based photothermal conversion material is facilitated, the solar absorptivity is effectively improved, the solar seawater desalination requirement is met, the interface light-steam conversion efficiency is improved, and the seawater desalination efficiency is maximized. The raw materials are wide, the cost is low, and the biodegradability is realized.

A ceramic paste is applied to a first glass sheet 11, and a ceramic paste is applied to a second glass sheet 13 with a lower solar absorptivity than that of the first glass sheet 11. In this case, the amount per unit area of the ceramic paste to be applied to the first glass sheet 11 is allowed to be smaller than that of the ceramic paste to be applied to the second glass sheet 13. Alternatively, a first ceramic paste and a second ceramic paste are allowed to have different compositions from each other. The first glass sheet 11 and the second glass sheet 13 are bent so that the surfaces onto which the ceramic pastes have been applied are shaped as concave surfaces. The applied ceramic paste is fired using the heating used for bending. Thus maskings 12 and 14 are formed. The first glass sheet 11 and the second glass sheet 13 are bonded to each other, with a resin interlayer film 15 being interposed therebetween.

The invention provides an application of a diamine compound containing a thiazole ring in preparing a solar heat-absorbing coating. The application comprises the following steps: under protection of argon, dissolving the diamine compound containing the thiazole ring in an organic solvent, and then adding a dianhydride monomer or a derivative thereof to carry out the polymerization reaction to obtain polyimide resin containing the thiazole ring; then, mixing the polyimide resin containing the thiazole ring with a pigment and a solvent, and then ball-milling and uniformly dispersing to obtain the coating. Test results show that the adhesive force of the coating prepared by the solar heat-absorbing coating is 4-5B, the solar absorptivity is 0.80-0.85, and the emissivity is 0.11-0.39. Therefore, the coating has higher solar absorptivity and lower emissivity, and can effectively improve the photothermal conversion efficiency of a solar heat collector. The coating has good mechanical property and strong weather resistance, and can be widely applied to the field of utilization of solar energy at medium and low temperature.

Disclosed is an optical thin film for a thin-film solar cell, which is formed directly on a top surface of the thin-film solar cell having a transparent conductive film layer to provide a high infrared emissivity and a lower solar absorptivity to the thin-film solar cell. The optical thin film is formed through a vacuum vapor deposition process. The thin film makes it possible to provide enhanced infrared emissivity based on its reduced thickness, while suppressing unnecessary incoming solar radiation in a simplified structure to achieve a reduced solar absorptivity so as to maintain desired cell efficiency. The optical thin film of the present invention is capable of achieving reduction in weight of a solar cell, and suitable for use, particularly, in space environments.

The invention belongs to the technical field of photoelectrical-material new energy and relates to a method for preparing a copper, zinc, tin and sulfur film material. The method comprises the following steps that copper nano-powder, zinc nano-powder, and tin nano-powder are used as raw materials and are evenly mixed with sulfur powder, quadrol, absolute ethyl alcohol and sodium borohydride, the mixture is washed and dried after ball milling, and then copper, zinc, tin and sulfur nano-powder is obtained; the nano-powder is evenly mixed with polyvinyl alcohol, isopropanol, and iodine elementary substance, so that a colloidal solution used as an electrophoretic solution is formed; a copper, zinc, tin and sulfur film coating is formed on a substrate through electrophoretic deposition with the electrophoretic deposition method, so that an electrophoretic deposition diaphragm is formed; drying, vulcanization and annealing are carried out on the electrophoretic deposition diaphragm, so that the copper, zinc, tin and sulfur film material is formed. According to the method, the copper, zinc, tin and sulfur film material with the honeycomb-shaped cellular structure is prepared according to the electrophoretic deposition technology and the reduction, vulcanization and annealing comprehensive treatment technology and is large in specific surface area, the cost is reduced, and the solar absorptivity and the efficiency of photovoltaic conversion of a film photovoltaic battery are effectively improved. The method is suitable for manufacturing of the film photovoltaic battery.

The invention discloses a cooling device of a space optical remote sensor. The cooling device of the space optical remote sensor comprises a radiator (1), a heat reservoir (2), at least one L-shaped heat pipe (3) and two heat insulation plates (4), wherein thermal control coatings which are high in infrared emittance and low in solar absorptivity are arranged on the outer surfaces, facing a copious cooling space, of the radiator (1) and the heat reservoir (2), other outer surfaces of the radiator (1) and the heat reservoir (2) are respectively coated with multiple layers of heat insulation assemblies, the heat reservoir (2) and the radiator (1) are machined integrally to form a part with an L-shaped cross section, both the heat reservoir (2) and the radiator (1) are filled with phase-change materials, the bottom of the heat reservoir (2) faces the earth and prevents heat flow coming from the earth from reaching the radiator (1) together with the heat insulation plates (4), and the at least one L-shaped heat pipe (3) is installed in the radiator (1) and in the heat reservoir (2). The cooling device of the space optical remote sensor has the advantages that resources on a satellite can be saved, heat disturbance from the earth can be eliminated, and temperature of electronic equipment which emits heat intermittently and is arranged inside the space optical remote sensor is controlled.

The invention discloses a preparation method of a high-absorption high-emissivity ultra-black molecular adsorption coating, belonging to the technical field of ultra-black materials. The invention aims to overcome the problems that an existing molecular pollution adsorber with a zeolite molecular sieve as a functional material is large in weight and size, inflexible in installation position and not wide enough in absorption area. According to the preparation method, carbon black and zeolite powder with large specific surface areas are taken as cores, functional powder prepared by an atomic layer deposition technology and taking an ultrathin oxide film layer as a shell is taken as filler, the filler is mixed with a low-volatility resin material, and then coating and curing are conducted so as to obtain the molecular adsorption coating. The average solar absorptivity of the coating is 95%, the hemispherical emissivity of the coating is 91%, a surface layer has the performance of eliminating stray light, and the adsorption capacity of the coating to organic gases (VOCs) such as phthalate, organosiloxane and n-butene is larger than or equal to 17.58 mg/g. The coating has excellent space environment adaptability and can meet the application requirements of spacecrafts and satellite imaging systems.

The invention provides a thermal control film for a space. The thermal control film comprises a polyimide germanium-plated film body and a carburized polyimide film body, wherein the polyimide germanium-plated film body and the carburized polyimide film body are bonded with each other point to point locally through a polyimide double-sided pressure-sensitive adhesive. The thermal control film hasthe advantages that the polyimide double-sided pressure-sensitive adhesive is used for locally bonding the polyimide germanium-plated film body with the black carburized polyimide film body point to point, a microwave array antenna is completely coated, heat in the thermal control film is absorbed by the black carburized polyimide film body, and the high infrared emissivity of the polyimide germanium-plated film body is utilized to dissipate heat to the space. Meanwhile, the low solar absorptivity of the polyimide germanium-plated film body is utilized to reduce the high-temperature influenceof external heat flow of the space on the antenna. Since the weight of the thermal control film is much lower than that of spray paint of an antenna structure, the lightweight design of a satellite isfacilitated.

The invention relates to a solar photo-thermal transforming absorbing film system and a preparation method thereof. The transformation absorbing film system is of a three-layer structure, and composed of an absorbing bottom layer, an absorbing middle layer and an antireflective top layer, wherein the absorbing bottom layer and the absorbing middle layer are prepared from M-A12O3 mixed hydrosol which is composed of transition metal M salt and aluminium salt and has different contents of the M salt; and the antireflective top layer is prepared from A 12O3 collosol, SiO2 collosol, and A12O3-SiO2mixed collosol. The solar photo-thermal transforming absorbing film system has a low preparation cost, the preparation method is simple and feasible, and no environment pollution is caused; and the optical property of the film system can meet the practical application requirement, that is to say, the solar absorptivity is greater than 0.90, and the emissivity is less than 0.10.

The invention discloses a solar energy bracket, which comprises a bottom framework, a plurality of top frameworks and the same number of solar energy photovoltaic plates. The solar energy bracket is characterized in that a strip-shaped groove is formed on the inner wall of each framework side of the top frameworks; the solar energy photovoltaic plates are mounted in the top frameworks through the strip-shaped grooves; an upright column is arranged in the bottom framework; a rotating beam capable of rotating round the upright column is arranged at the top of the upright column; a plurality of cross beams are arranged between two opposite framework sides of each top framework; and the rotating beam is arranged below the cross beams and perpendicular to the cross beams. The invention solves the problems that the solar energy photovoltaic plates have low solar absorptivity, are easy to be damaged, have short service lives and influence the use of solar energy, which are caused by the solar energy bracket placing manner in the prior art, and provides the solar energy bracket which has a simple structure, is safe and convenient to use, can fully absorb solar energy and improves the work efficiency of the solar energy photovoltaic plates.

The invention discloses a nano black chrome highly selective endothermic film formula and a preparation method thereof. The raw materials consist of a base material, nano dichromium trioxide powder and ethanol; the base material includes manganese acetate, ferric chloride, nickel chloride and cupric chloride; and the mass ratio of the components which are the manganese acetate, the ferric chloride, the nickel chloride and the cupric chloride in the base material is 3-5:1-3:2-4:1. The nano material uniformly is deposited on the surface of the metal base material; and through actual measurement,solar absorptivity is greater than 93%, and infrared emissivity is less than 10%; the obtained film has excellent product stability, weatherability and optical performance; and the preparation technology is simple and feasible, and the formula and the preparation method have stronger market prospects and economic benefits prospects.

The invention discloses a membrane structure of a high-temperature oxidation-resistant selective absorption membrane for the inner pipe of a condensation solar thermal power generation collector pipe, which is mainly characterized by comprising a stainless steel substrate (1), wherein a Ti membrane (2), a TiAlON membrane (3) and an Al2O3 membrane (4) are sequentially arranged on the surface of the stainless steel substrate (1) from interior to exterior. The membrane structure disclosed by the invention has the characteristics of reasonable membrane structure, strong high-temperature oxidation resistance, high solar absorptivity, low reflectivity, long service life and the like.

The invention relates to a solar instantaneous water-based phase change heat accumulator which comprises a double-layer vacuum glass jacketing, a mixture of energy storage particles and water, a heat exchange copper calandria and an anti-expansion spring plug, wherein the double-layer vacuum glass jacketing is cylindrical; an outlet and an inlet of the heat exchange copper calandria are positioned outside the double-layer vacuum glass jacketing, and are symmetrically formed in the outlet end of the double-layer vacuum glass jacketing up and down; other parts of the heat exchange copper calandria are wound inside the double-layer vacuum glass jacketing; the space between the heat exchange copper calandria in the double-layer vacuum glass jacketing and the inner wall of the double-layer vacuum glass jacketing is filled with the mixture of energy storage particles and water; and the center of the outlet of the double-layer vacuum glass jacketing is sealed with the anti-expansion spring plug. According to the solar instantaneous water-based phase change heat accumulator, the solar absorptivity can be effectively improved, the heat loss due to radiation is reduced, and a wider approach for the application of solar thermal collectors is developed.