CN112625521A - Low-infrared-emissivity coating with visible light compatibility and preparation method thereof - Google Patents
Low-infrared-emissivity coating with visible light compatibility and preparation method thereof Download PDFInfo
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- CN112625521A CN112625521A CN202011393500.8A CN202011393500A CN112625521A CN 112625521 A CN112625521 A CN 112625521A CN 202011393500 A CN202011393500 A CN 202011393500A CN 112625521 A CN112625521 A CN 112625521A
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- emissivity coating
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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
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/04—Homopolymers or copolymers of esters
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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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/30—Camouflage paints
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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
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0812—Aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3009—Sulfides
- C08K2003/3036—Sulfides of zinc
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
The invention relates to a coating with visible light compatibility and low infrared emissivity and a preparation method thereof. According to the technical scheme, the infrared emissivity of the prepared double-layer coating at a wave band of 3-5 microns can reach 0.25-0.55, the infrared emissivity at a wave band of 8-14 microns can reach 0.5-0.6, meanwhile, the brightness of metal aluminum powder can be covered, various light-color coatings can be prepared, and the invisible compatibility of infrared and visible light under certain background conditions can be realized.
Description
Technical Field
The invention belongs to the technical field of coating preparation, and particularly relates to a preparation method of a coating with visible light compatibility and low infrared emissivity.
Background
Any object with a temperature above absolute zero will have some infrared radiation, and the infrared detection system finds the target based on the difference between the target and the background infrared radiation. According to Stefin-Boltzmann law, it can be known that: e ═ epsilon σ Τ 4 (where epsilon is the emissivity of the object, σ is the stiifen-boltzmann normality, and Τ is the absolute temperature of the object), infrared stealth materials can be divided into two categories, one category is to reduce the surface emissivity of the material and the other category is to reduce the surface temperature. The reduction of the surface temperature of an object is difficult to realize, so the infrared stealth coating is mainly focused on developing a low-emissivity coating material.
The overseas United states was the earliest country for developing thermal infrared low-emissivity coatings, and the air force in the United states in the 60 s entrusted the Honeywellinc company (Honeywellinc) to develop diffuse reflection type infrared camouflage coatings. In 1981, the average emissivity of navy blue-gray paint developed in the United states of America in a wave band of 2-15 um is 0.512. According to the patent report of 1991, black, green and brown 'three-color infrared camouflage systems' with infrared emissivities of 0.1, 0.5 and 0.8 respectively have been developed in the United states. Johansson et al coat a layer of metal reflecting layer on the substrate first, then coat a layer of plastics with different emissivity on the metal reflecting layer, on one hand the metal reflecting layer can reflect the heat inside the target, reduce its heat dissipating capacity; on the other hand, the metal reflecting layer reflects infrared rays in sunlight, and the surface plastic layer has different emissivity, so that the infrared image of the target is similar to the infrared image of the environment, and the purpose of stealth is achieved.
The research of the thermal infrared camouflage paint is started at the end of 70 years in China, the paint mainly comprises a paint and a film coating mode, and the low-emissivity paint mainly comprises a metal pigment (most of aluminum powder), a coloring pigment and a binder. And the research on the low-infrared-emissivity coating compatible with visible light mainly focuses on the application aspect of the doped oxide semiconductor.
The preparation of the two layers of foreign low-emissivity coatings mainly comprises the steps of coating organic matters with different emissivity on the surface of a metal layer, changing an infrared image of a target to realize infrared camouflage, coating a plastic layer on the surface of the metal layer, wherein the absorption rate difference of most organic compounds in two infrared atmospheric windows of 3-5 um and 8-14 um, especially in a wave band of 8-14 um, is not great, and the adjustment of the brightness of the metal layer is limited, so that the coating is difficult to realize the compatibility with visible light.
Domestic infrared/visible light compatible coatings are mainly focused on the application of doped oxide semiconductors, the doped oxide has limited capability of reducing the infrared emissivity in a coating mode, and the coating emissivity is reported to be about 0.68. Infrared/visible compatible stealth is also realized by designing a photonic crystal structure, and is currently in a laboratory stage.
Disclosure of Invention
The invention aims to provide a preparation method of a low-infrared-emissivity coating with visible light compatibility, which can obtain the low-infrared-emissivity coating, simultaneously realize visible light stealth under certain background conditions and improve the viability of military targets on modern battlefields.
The low-infrared-emissivity coating with visible light compatibility adopts a two-layer structure design of a bottom metal layer and a surface infrared transparent layer, and optimizes the particle size selection and addition of aluminum powder, the addition of external transparent pigment and the surface state of the surface coating. The specific technical scheme is as follows:
the formula of the bottom metal layer is as follows: the high-temperature-resistant aluminum alloy material comprises, by mass, 10-13 parts of a thermoplastic or thermosetting binder, 3.1-4.1 parts of an aluminum relief powder and 5-10 parts of a diluent.
Preferably, the particle size of the floating aluminum powder is 16-23 μm.
The preparation method of the bottom metal layer comprises the following steps: the floating aluminum powder in the formula is evenly stirred in a diluent solution and then soaked for 1 hour, other raw materials are added, the viscosity of the paint is adjusted, and the paint is sprayed on a substrate.
Preferably, the spraying thickness is 15-25 μm.
Preferably, the diluent is butyl acetate.
The formula of the surface infrared transparent layer comprises the following components: the infrared transparent paint comprises, by mass, 10-11 parts of thermoplastic polymethacrylate, 25-28 parts of infrared transparent pigment and 35-39 parts of special diluent.
Preferably, the thermoplastic polymethacrylate is self-made, and has excellent mechanical properties, and most importantly, has certain infrared transparency which is 8-14 mu m (714-1250 cm)-1) The strong absorption peak of the wave band is less.
Preferably, the infrared transparent pigment is mainly selected from one or more of selenide, sulfide, fluoride, such as zinc selenide, zinc sulfide, cadmium sulfide, calcium fluoride, barium fluoride, etc.
The special diluent needs to have strong solubility to the thermoplastic polymethacrylic resin.
Preferably, the special diluent is one or more of commercial industrial grade xylene, butyl acetate and ethyl acetate.
The preparation method of the surface infrared transparent layer comprises the following steps: the resin, the pigment and the diluent in the formula are uniformly mixed, ground and dispersed for 1 hour, adjusted to spray viscosity and sprayed on the completely and completely dried bottom metal layer.
Preferably, the spraying thickness is 5-10 μm.
The invention has the technical effects that:
the infrared emissivity of the prepared double-layer coating at a wave band of 3-5 mu m can reach 0.25-0.55, the infrared emissivity of the prepared double-layer coating at a wave band of 8-14 mu m can reach 0.5-0.6, meanwhile, the brightness of the metal aluminum powder can be covered, various light-color coatings can be prepared, and the invisible compatibility of infrared visible light under certain background conditions can be realized.
Detailed Description
This example demonstrates a method of making a low ir emissivity coating with visible light compatibility.
Example one
The formula of the bottom metal layer is as follows:
| name of raw materials | Added amount (g) |
| Desmodur N 3390 | 4.8 |
| Tianshan Cuixian 1420 | 6.4 |
| Floating type aluminum powder | 4.1 |
| Acetic acid butyl ester | 5.0 |
The formula of the surface layer infrared transparent layer comprises:
| name of raw materials | Added amount (g) |
| Thermoplastic polymethacrylic resin | 10.0 |
| Zinc sulfide | 25.0 |
| Acetic acid ethyl ester | 39.0 |
And the bottom metal layer is prepared according to the formula and then sprayed on a tin plate, a finish infrared transparent layer is sprayed after the bottom metal layer is dried, and the average infrared emissivity of the coating at a wave band of 8-14 mu m is detected to be 0.54 after 7 days, and the average infrared emissivity of the coating at a wave band of 3-5 mu m is detected to be 0.28.
Example two
The formula of the bottom metal layer is as follows:
the formula of the surface layer infrared transparent layer comprises:
| name of raw materials | Added amount (g) |
| Thermoplastic polymethacrylic resin | 10.0 |
| Zinc selenide | 28.0 |
| Acetic acid ethyl ester | 39.0 |
And the bottom metal layer is prepared according to the formula and then sprayed on a tin plate, a finish infrared transparent layer is sprayed after the bottom metal layer is dried, and the average infrared emissivity of the coating at a wave band of 8-14 mu m is detected to be 0.58 and the average infrared emissivity of the coating at a wave band of 3-5 mu m is detected to be 0.42 after 7 days.
Claims (7)
1. The utility model provides a low infrared emissivity coating with visible light compatibility, comprises bottom metal layer and surface course infrared transparent layer which characterized in that: the composition of each component is, by mass, 10-13 parts of a binder, 3.1-4.1 parts of an aluminum relief powder and 5-10 parts of a diluent; the surface infrared transparent layer comprises 10-11 parts of thermoplastic polymethacrylate, 25-28 parts of infrared transparent pigment and 35-39 parts of special diluent.
2. A low emissivity coating according to claim 1, wherein: the particle size of the floating aluminum powder is 16-23 mu m.
3. A low emissivity coating according to claim 1, wherein: the binder is thermoplastic or thermosetting.
4. A low emissivity coating according to claim 1, wherein: the infrared transparent pigment is at least one of selenide, sulfide and fluoride.
5. A low emissivity coating according to claim 1, wherein: the special diluent is one or more mixed solvents of industrial xylene, butyl acetate and ethyl acetate.
6. A method of making a low IR emissivity coating with visible light compatibility according to any one of claims 1 to 5, wherein: preparing materials according to the formula, wherein the preparation method of the bottom metal layer comprises the steps of uniformly stirring the floating aluminum powder in a diluent solution, soaking for 1 hour, adding other raw materials, adjusting the viscosity of spray paint, and spraying the mixture on a substrate; the preparation method of the surface layer infrared transparent layer comprises the steps of uniformly mixing the resin, the pigment and the special diluent in the formula, grinding and dispersing for 1 hour, adjusting the spraying viscosity, and spraying the mixture on the completely dried bottom metal layer.
7. The method of making a low emissivity coating of claim 6, wherein said coating comprises: the spraying thickness of the bottom metal layer is 5-10 mu m, and the spraying thickness of the surface infrared transparent layer is 15-25 mu m.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011393500.8A CN112625521A (en) | 2020-12-02 | 2020-12-02 | Low-infrared-emissivity coating with visible light compatibility and preparation method thereof |
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| CN202011393500.8A CN112625521A (en) | 2020-12-02 | 2020-12-02 | Low-infrared-emissivity coating with visible light compatibility and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113281916A (en) * | 2021-05-10 | 2021-08-20 | 清华大学 | Method for continuously regulating infrared emissivity of object and infrared functional surface based on method |
| CN115651443A (en) * | 2022-10-31 | 2023-01-31 | 中昊北方涂料工业研究设计院有限公司 | Low-infrared-emissivity functional filler compatible with visible light camouflage |
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| CN106382854A (en) * | 2016-09-08 | 2017-02-08 | 中国人民解放军国防科学技术大学 | Visible light and infrared light compatible camouflage material and preparation method thereof |
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| CN111103643A (en) * | 2019-12-26 | 2020-05-05 | 中国人民解放军国防科技大学 | Selective-emission infrared stealth material and preparation method thereof |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113281916A (en) * | 2021-05-10 | 2021-08-20 | 清华大学 | Method for continuously regulating infrared emissivity of object and infrared functional surface based on method |
| CN115651443A (en) * | 2022-10-31 | 2023-01-31 | 中昊北方涂料工业研究设计院有限公司 | Low-infrared-emissivity functional filler compatible with visible light camouflage |
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