CN108715711B - Thermochromic emissivity-changing coating and preparation method and application thereof - Google Patents
Thermochromic emissivity-changing coating and preparation method and application thereof Download PDFInfo
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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
- C09D11/00—Inks
- C09D11/50—Sympathetic, colour changing or similar inks
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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
- C09D11/00—Inks
- C09D11/30—Inkjet printing inks
Abstract
The invention provides a thermochromic emissivity-changing coating, and a preparation method and application thereofThe coating is composed of a thermochromism material, a thermochromism emissivity material, a film forming material, an antibacterial agent, an anti-settling dispersant and a solvent, and is prepared by selecting [ (C)2H5)2NH2]2CuCl4As a thermochromic material, an acrylic resin emulsion and/or a polyvinyl alcohol aqueous solution are/is matched as a film forming material and a specific solvent, and the cooperation of the three materials enables the coating to be green at room temperature (25 ℃), yellow at a high temperature (52 ℃) or above), and the coating can recover green when the temperature is reduced, and meanwhile, the coating has the characteristic of reducing emissivity along with temperature increase within a certain temperature range (60-100 ℃) by matching with a thermochromic emissivity material, so that the high-temperature weapon equipment can realize self-adaptive camouflage at an infrared band.
Description
Technical Field
The invention belongs to the technical field of functional materials, and particularly relates to a thermochromic emissivity-changing coating capable of being used as a self-adaptive camouflage coating, and a preparation method and application thereof.
Background
In the military camouflage field, the camouflage coating is used for concealing military targets, so that the military targets show spectral reflection performance close to that of a combat environment, and at present, the camouflage coating is designed by coping with enemy reconnaissance measures in visible light, ultraviolet light, near infrared light, intermediate infrared light and other wave bands. However, with frequent change of combat regions and continuous widening of military detector wave bands in modern high-tech wars, the camouflage coating with a single spectrum band cannot meet the requirements of camouflage protection, so that the research on visible/infrared compatible camouflage coatings is gradually developed to be a necessary trend.
For example, chinese patent document CN107141907A discloses a visible/infrared compatible self-adaptive camouflage coating and a preparation method thereof, wherein the coating has a layered structure and sequentially comprises a substrate layer, a bottom layer, a thermally variable infrared emission layer and a camouflage pattern layer from inside to outside. According to the prior art, dye molecules with large tinting strength are adopted in the camouflage pattern layer, so that the thickness of the camouflage pattern layer is 2-3 microns, on one hand, light in a far infrared waveband (7.5-14 microns) can be transmitted, the change of the infrared emissivity of the thermotropic infrared emissivity layer can be reflected, on the other hand, the thickness of the camouflage pattern layer is larger than the wavelength of a visible light waveband, the color of the thermotropic infrared emissivity layer cannot be reflected, and the whole coating has visible/infrared compatible self-adaptive camouflage performance. However, the coating in the technology has a complex structure, and accordingly, the preparation process of the coating is complicated, which is not beneficial to industrial production.
Disclosure of Invention
The invention aims to overcome the defects of complex multilayer structure and complex preparation process of the existing visible/infrared compatible self-adaptive camouflage coating, and further provides a thermochromic emissivity coating which has a simple structure and a simple and convenient preparation process and can be used for producing the self-adaptive camouflage coating.
Further, the invention also provides a method for preparing the thermochromic emissivity coating.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a thermochromism variable-emissivity coating comprises the following raw materials in percentage by mass:
10-30% of a thermochromic material, 2-10% of a thermochromic emissivity material, 10-40% of a film forming material, 0.1-0.6% of an antibacterial agent, 0.1-0.6% of an anti-settling dispersant and the balance of a solvent;
the thermochromic material is [ (C)2H5)2NH2]2CuCl4；
The film forming material is acrylic resin emulsion and/or polyvinyl alcohol aqueous solution.
Preferably, the thermochromic emissivity-changing coating comprises the following raw materials:
20% of thermochromic material, 5% of thermochromic emissivity material, 35% of film forming material, 0.1% of antibacterial agent, 0.5% of anti-settling dispersant and the balance of deionized water; or
15% of thermochromic material, 3% of thermochromic emissivity material, 30% of film forming material, 0.2% of antibacterial agent, 0.2% of anti-settling dispersant and the balance of ethanol; or
25% of thermochromic material, 7% of thermochromic emissivity material, 25% of film forming material, 0.1% of antibacterial agent, 0.5% of anti-settling dispersant and the balance of diethylene glycol diethyl ether.
Preferably, the [ (C)2H5)2NH2]2CuCl4The purity of the crystal is more than 99.9 percent, the grain size is 1-100 mu m, and the relative humidity is 10-20 percent.
Preferably, the [ (C)2H5)2NH2]2CuCl4The preparation method comprises the following steps:
dissolving copper dichloride and diethylamine hydrochloride in deionized water according to the molar ratio of 1 (1.5-2.5), uniformly stirring, heating to 50-70 ℃, reacting for 2 hours, cooling, filtering, collecting solids, recrystallizing with absolute ethyl alcohol, and drying crystals to obtain the copper dichloride-diethylamine hydrochloride crystal.
Preferably, the crystals are dried under vacuum at 60 ℃ for 3 h.
Preferably, the antibacterial agent is one or more of acylaniline antibacterial agents, imidazole antibacterial agents, thiazole antibacterial agents and isothiazolone derivative antibacterial agents; and/or
The anti-settling dispersant is one or more of BYK-2155, BYK-161, BYK-2173, BYK-420 and BYK-8420.
Preferably, the material with thermal variable emissivity is VO2And/or a perovskite-type composite oxide, which may be La1-xSrxMnO3、La1-xCaxMnO3Or Sm1-xCaxMnO3、Nd1-xEuxNiO3Wherein 1 > x > 0.
Preferably, the solvent is one or more of deionized water, ethanol, ethylene glycol or diethylene glycol diethyl ether.
The thermochromic emissivity-changing coating is applied to the field of military camouflage.
The method for preparing the thermochromic emissivity coating comprises the following steps:
adding the anti-settling dispersing agent into the deionized water, stirring, adding the thermochromism emissivity material, the thermochromism material, the film forming material and the antibacterial agent, continuing stirring, uniformly mixing, coating on a base material, and drying to obtain the coating.
The thermochromic emissivity-changing coating prepared by the method is applied to the field of military camouflage.
Compared with the prior art, the technical scheme of the invention has the following advantages:
1. the thermochromism emissivity coating provided by the invention consists of a thermochromism material, a thermochromism emissivity material, a film forming material, an antibacterial agent, an anti-settling dispersant and deionized water, and is prepared by selecting [ (C)2H5)2NH2]2CuCl4As a thermochromic material, an acrylic resin emulsion and/or a polyvinyl alcohol aqueous solution are/is matched as a film forming material, and the two materials and a specific solvent are cooperatively matched, so that the coating disclosed by the invention can be green at room temperature (25 ℃), yellow at a higher temperature (52 ℃) and above), and can be restored to green when the temperature is reduced to below 52 ℃, and the self-adaptive camouflage characteristic that the jungle camouflage color dominant color is displayed in a low-temperature jungle environment and the desert camouflage color dominant color is displayed in a high-temperature desert area is met; meanwhile, by matching with a thermal variable emissivity material, the coating disclosed by the invention has the characteristic that the emissivity is reduced along with the increase of the temperature within a certain temperature range (60-100 ℃), so that the high-temperature weapon equipment can realize self-adaptive camouflage in an infrared band. Therefore, the coating can be used as a military camouflage coating, so that the coating can realize self-adaptive camouflage in both visible and infrared bands.
The coating is also added with an antibacterial agent, and the function of the coating is to keep the growth or reproduction of certain microorganisms (bacteria, fungi, yeasts, algae, viruses and the like) below a necessary level within a certain time so as to ensure the long-term stability of the coating and be harmless to human bodies. If not, the coating may cause mass propagation of microorganisms due to problems such as a storage method and the like, and a nozzle may be blocked in the ink-jet printing process, thereby affecting the film forming quality or the thermochromic performance.
2. The preparation method of the thermochromic emissivity coating provided by the invention can be prepared by uniformly mixing all the raw materials, and the thermochromic emissivity coating can be obtained by utilizing an ink-jet printing technology, and the preparation method is simple and convenient in preparation process, strong in operability and convenient for industrialization.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a photograph (25 deg.C) of a thermochromic emissivity coating provided in example 1;
FIG. 2 is a photograph (52 deg.C) of a thermochromic emissivity coating provided in example 1;
FIG. 3 is a graph of the absorption of the visible spectrum at 25 deg.C and 52 deg.C of the thermochromic emissivity coating provided in example 1;
FIG. 4 is a graph of the change of infrared emissivity of a coating printed by the thermochromic emissivity printing ink provided in example 1 in a wavelength band of 3-5 μm with temperature;
FIG. 5 is a graph showing the variation of infrared emissivity with temperature of a coating printed by the thermochromic emissivity printing ink provided in example 1 in a wavelength band of 8-14 μm.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
The preparation method of the thermochromic emissivity-changing coating provided by the embodiment comprises the following steps of:
(1) thermochromic material [ (C)2H5)2NH2]2CuCl4Preparation of
Adding CuCl2·2H2O17 g and (C)2H5)2Dissolving 21.2g of NH & HCl in 140g of deionized water, stirring and mixing uniformly, carrying out a constant-temperature water bath reaction at 70 ℃ for 2h, taking out, cooling to room temperature, carrying out suction filtration on absolute ethyl alcohol after solid is separated out, collecting the solid, recrystallizing for 2 times by using the absolute ethyl alcohol, putting the crystal into a vacuum drying oven, and drying for 3h at 60 ℃ to obtain 38g of bright green needle-like crystals, namely [ (C)2H5)2NH2]2CuCl4。
Detected, [ (C)2H5)2NH2]2CuCl4The purity of the crystal is 99.99%, the grain size is 18-31 μm, and the relative humidity is 15%.
(2) Preparation of the coating
0.25g of BYK-2155 (manufactured by Bick chemical Co., Germany) was slowly added to 19.7g of deionized water, and stirred for 20min, and 2.5g of VO was slowly added while stirring2Powder, 10g of [ (C)2H5)2NH2]2CuCl417.5g of acrylic resin emulsion (the solid content of the acrylic resin emulsion is 40 percent) and 0.05g of 1, 2-benzisothiazolin-3-one, and the mixture is continuously stirred for 1 hour, sprayed on an aluminum plate and dried for 60 minutes at the temperature of 70 ℃ to form the thermochromic emissivity coating with the thickness of 0.1 mm.
Fig. 1 is a photograph of a thermochromic emissivity coating made using this example printed at 25 c, which clearly shows that the photograph at 25 c is green, which is similar to RAL6018 by comparison to RAL color scale and has an RGB value of R101G148B 68.
Fig. 2 is a photograph of a thermochromic emissivity coating made using this example printed at 52 c, which clearly shows that the photograph at 52 c is yellow, which is similar to RAL1018 in color and has a RGB value of R249G206B82, as can be seen by comparison with the RAL color scale. When the temperature is reduced to below 52 ℃, the green color is recovered.
FIG. 3 is a graph of the absorption of the thermochromic emissivity coating prepared in this example at 25 ℃ and 52 ℃, and it can be seen from the graph that the coating absorbs less visible light around 580nm at 25 ℃, which indicates that the coating is green; the coatings have weak absorption of visible light above 550nm at 52 ℃, which indicates that the coatings are yellow brown.
The infrared emissivity of the thermochromic emissivity coating prepared by the embodiment at different temperatures is tested by the following specific test method:
heating the constant-temperature water bath to a temperature to be measured, adhering a coating sample to the side surface of the water bath by using a heat-conducting adhesive, wherein the position is below the water surface and close to the center, and carrying out heat balance for 30 min; and (3) turning on the FLIR thermal infrared imager, starting an automatic shooting function to record an IR chart, reading the radiation temperature of the surface of the sample by using the attached software of the IR thermal infrared imager, calculating to obtain the IR emittances of the coating at 40 ℃, 50 ℃, 60 ℃, 70 ℃, 80 ℃, 90 ℃ and 100 ℃, and further drawing the variation curves of the IR emittances with the temperature, wherein the variation curves are respectively shown in fig. 4 and 5.
As can be seen from FIG. 4, in the wave band of 3-5 μm, the emissivity of the coating is suddenly reduced at 65-70 ℃, and the maximum mutation value is 0.3. As can be seen from FIG. 5, the emissivity of the coating decreases sharply at 65-70 ℃ in the wavelength range of 8-14 μm, and the maximum strain value is 0.22.
Example 2
The preparation method of the thermochromic emissivity-changing coating provided by the embodiment comprises the following steps of:
(1) thermochromic material [ (C)2H5)2NH2]2CuCl4Preparation of
Adding CuCl2·2H2O17 g and (C)2H5)2Dissolving 19.7g of NH & HCl in 120g of deionized water, stirring and mixing uniformly, carrying out a constant-temperature water bath reaction at 60 ℃ for 2h, taking out, cooling to room temperature, carrying out suction filtration on absolute ethyl alcohol after solid is separated out, collecting the solid, recrystallizing for 2 times by using the absolute ethyl alcohol, putting the crystal into a vacuum drying oven, and drying for 3h at 60 ℃ to obtain 34.1g of bright green needle-like crystal, namely [ (C)2H5)2NH2]2CuCl4。
Detected, [ (C)2H5)2NH2]2CuCl4The purity of the crystal is 99.9%, the grain size is 10-39 μm, and the relative humidity is 12%.
(2) Preparation of the coating
0.1g of BYK-161 (manufactured by Bick chemical Co., Germany) was slowly added to 25.8g of ethanol, and stirred for 30min, and 1.5g of VO was slowly added while stirring2Powder, 7.5g of [ (C)2H5)2NH2]2CuCl415g of acrylic resin emulsion (the solid content of the acrylic resin emulsion is 40%) and 0.1g of 1, 2-benzisothiazolin-3-one, continuously stirring for 1h, spraying the acrylic resin emulsion on an aluminum plate, and drying the acrylic resin emulsion at the temperature of 80 ℃ for 100min to form the thermochromic emissivity coating with the thickness of 1 mm.
Example 3
The preparation method of the thermochromic coating provided by the embodiment comprises the following steps of:
(1) thermochromic material [ (C)2H5)2NH2]2CuCl4Preparation of
Adding CuCl2·2H2O17 g and (C)2H5)2Dissolving 16.4g of NH & HCl in 120g of deionized water, stirring and mixing uniformly, reacting in a constant-temperature water bath at 65 ℃ for 2h, taking out, cooling to room temperature, leaching with absolute ethyl alcohol after solid is separated out, collecting the solid, recrystallizing with absolute ethyl alcohol for 2 times, putting the crystal into a vacuum drying oven, and drying at 60 ℃ for 3h to obtain 29g of brilliant greenA color needle-like crystal, i.e., [ (C)2H5)2NH2]2CuCl4。
Detected, [ (C)2H5)2NH2]2CuCl4The purity of the crystal is 99.99%, the grain size is 16-42 μm, and the relative humidity is 20%.
(2) Preparation of the coating
0.25g of BYK-2173 (manufactured by Becko chemical Co., Germany) was slowly added to 21.2g of diethylene glycol diethyl ether, stirred for 30min, and 3.5g of VO was slowly added with stirring2Powder, 12.5g of [ (C)2H5)2NH2]2CuCl412.5g of acrylic resin emulsion (the solid content of the acrylic resin emulsion is 40 percent) and 0.05g of 1, 2-benzisothiazolin-3-one, and after continuously stirring for 1.5h, the acrylic resin emulsion is sprayed on an aluminum plate and dried for 80min at the temperature of 90 ℃ to form the thermochromic emissivity coating with the thickness of 0.5 mm.
Example 4
The preparation method of the thermochromic coating provided by the embodiment comprises the following steps of:
(1) thermochromic material [ (C)2H5)2NH2]2CuCl4Preparation of
Adding CuCl2·2H2O17 g and (C)2H5)2Dissolving 27.4g of NH & HCl in 150g of deionized water, stirring and mixing uniformly, carrying out a constant-temperature water bath reaction at 65 ℃ for 2h, taking out, cooling to room temperature, carrying out suction filtration on absolute ethyl alcohol after solid is separated out, collecting the solid, recrystallizing for 2 times by using the absolute ethyl alcohol, putting the crystal into a vacuum drying oven, and drying for 3h at 60 ℃ to obtain 38.2g of bright green needle-like crystal, namely [ (C)2H5)2NH2]2CuCl4。
Detected, [ (C)2H5)2NH2]2CuCl4The purity of the crystal is 99.99%, the grain size is 22-50 μm, and the relative humidity is 10%.
(2) Preparation of the coating
To 17.15g of deionized water, 0.05g of BYK-42 was slowly added0 (manufactured by Bick chemical Co., Germany), stirring for 10min, and slowly adding 5g of La while stirring0.825Sr0.175MnO3Powder, 7.5g of [ (C)2H5)2NH2]2CuCl420g of acrylic resin emulsion (the solid content of the acrylic resin emulsion is 40%) and 0.3g of 1, 2-benzisothiazolin-3-one, continuously stirring for 1.5h, spraying the acrylic resin emulsion on an aluminum plate, and drying the acrylic resin emulsion at the temperature of 80 ℃ for 120min to form the thermochromic emissivity coating with the thickness of 0.8 mm.
Example 5
The preparation method of the thermochromic coating provided by the embodiment comprises the following steps of:
(1) thermochromic material [ (C)2H5)2NH2]2CuCl4Preparation of
Adding CuCl2·2H2O17 g and (C)2H5)2Dissolving NH & HCl 25.5g in deionized water 150g, stirring and mixing uniformly, reacting in 50 ℃ constant temperature water bath for 2h, taking out, cooling to room temperature, after solid precipitation, carrying out suction filtration by absolute ethyl alcohol, collecting solid, recrystallizing for 2 times by absolute ethyl alcohol, putting the crystal into a vacuum drying oven, drying for 3h at 60 ℃ to obtain 38.1g bright green needle-like crystal, namely [ (C)2H5)2NH2]2CuCl4。
Detected, [ (C)2H5)2NH2]2CuCl4The purity of the crystal is 99.99%, the grain size is 25-62 μm, and the relative humidity is 18%.
(2) Preparation of the coating
0.3g of BYK-8420 (manufactured by Bick chemical Co., Germany) was slowly added to 28.5g of deionized water, and stirred for 10min, and 1g of La was slowly added thereto with stirring0.7Ca0.3MnO3Powder, 15g of [ (C)2H5)2NH2]2CuCl45g of acrylic resin emulsion (the solid content of the acrylic resin emulsion is 40 percent) and 0.175g of 1, 2-benzisothiazolin-3-one, continuously stirring for 1.5h, spraying the acrylic resin emulsion on an aluminum plate, and drying the acrylic resin emulsion for 120min at 70 ℃ to form the thermochromic emissivity with the thickness of 0.6mmAnd (4) coating.
Example 6
The preparation method of the thermochromic coating provided by the embodiment comprises the following steps of:
(1) thermochromic material [ (C)2H5)2NH2]2CuCl4Preparation of
Adding CuCl2·2H2O17 g and (C)2H5)2Dissolving NH & HCl 22.9g in deionized water 150g, stirring and mixing uniformly, reacting in a 55 ℃ constant temperature water bath for 2h, taking out, cooling to room temperature, after solid precipitation, carrying out suction filtration by absolute ethyl alcohol, collecting the solid, recrystallizing for 2 times by absolute ethyl alcohol, putting the crystal into a vacuum drying oven, drying for 3h at 60 ℃ to obtain 38.2g bright green needle-shaped crystals, namely [ (C)2H5)2NH2]2CuCl4。
Detected, [ (C)2H5)2NH2]2CuCl4The purity of the crystal is 99.99%, the grain size is 15-45 mu m, and the relative humidity is 17%.
(2) Preparation of the coating
0.15g of BYK-8420 (manufactured by Bick chemical Co., Germany) was slowly added to 26.75g of deionized water, and stirred for 10min, and 3g of VO was slowly added while stirring2Powder, 10g of [ (C)2H5)2NH2]2CuCl410g of polyvinyl alcohol aqueous solution and 0.1g of 1, 2-benzisothiazolin-3-one, continuously stirring for 1h, spraying on an aluminum plate, and drying at 90 ℃ for 60min to form the thermochromic emissivity coating with the thickness of 0.3 mm.
Comparative example 1
Comparative example thermochromic Material [ (C)2H5)2NH2]2CuCl4The preparation method is the same as that of example 1 of the present invention.
The preparation method of the thermochromic emissivity-changing coating in the comparative example is as follows:
0.25g of BYK-2155 (manufactured by Bick chemical Co., Germany) was slowly added to 19.7g of deionized water, and stirred for 20min while stirring2.5g of VO were slowly added with addition of2Powder, 10g of [ (C)2H5)2NH2]2CuCl417.5g of waterborne polyurethane (with the solid content of 40%) and 0.05g of 1, 2-benzisothiazolin-3-one, continuously stirring, precipitating a large amount of polyurethane, filtering, spraying the filtrate on an aluminum plate, and drying at 70 ℃ for 60min to form a coating with low solid content and unobvious color development.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (7)
1. The thermochromic variable emissivity coating is characterized by comprising the following raw materials in percentage by mass:
10-30% of a thermochromic material, 2-10% of a thermochromic emissivity material, 10-40% of a film forming material, 0.1-0.6% of an antibacterial agent, 0.1-0.6% of an anti-settling dispersant and the balance of a solvent;
the thermochromic material is [ (C)2H5)2NH2]2CuCl4；
The material with thermally variable emissivity is VO2And/or perovskite type composite oxide, so that the coating has the characteristic of reducing emissivity along with the increase of temperature within 60-100 ℃;
the film forming material is acrylic resin emulsion and/or polyvinyl alcohol aqueous solution.
2. The thermochromic emissivity coating of claim 1,
20% of thermochromic material, 5% of thermochromic emissivity material, 35% of film forming material, 0.1% of antibacterial agent, 0.5% of anti-settling dispersant and the balance of deionized water; or
15% of thermochromic material, 3% of thermochromic emissivity material, 30% of film forming material, 0.2% of antibacterial agent, 0.2% of anti-settling dispersant and the balance of ethanol; or
25% of thermochromic material, 7% of thermochromic emissivity material, 25% of film forming material, 0.1% of antibacterial agent, 0.5% of anti-settling dispersant and the balance of diethylene glycol diethyl ether.
3. Thermochromic emissivity coating according to claim 1 or 2, wherein [ (C) is2H5)2NH2]2CuCl4The purity of the crystal is more than 99.9 percent, the grain size is 1-100 mu m, and the relative humidity is 10-20 percent.
4. The thermochromic emissivity coating of claim 3, wherein the [ (C) is2H5)2NH2]2CuCl4The preparation method comprises the following steps:
dissolving copper dichloride and diethylamine hydrochloride in deionized water according to the molar ratio of 1 (1.5-2.5), uniformly stirring, heating to 50-70 ℃, reacting for 2 hours, cooling, filtering, collecting solids, recrystallizing with absolute ethyl alcohol, and drying crystals to obtain the copper dichloride and diethylamine hydrochloride crystal.
5. Thermochromic emissivity coating according to claim 4, wherein the crystals are vacuum dried at 60 ℃ for 3 h.
6. The thermochromic emissivity coating of claim 1 or 2, wherein the antimicrobial agent is one or more of an anilide antimicrobial agent, an imidazole antimicrobial agent, a thiazole antimicrobial agent, an isothiazolone derivative antimicrobial agent; and/or
The anti-settling dispersant is one or more of BYK-2155, BYK-161, BYK-2173, BYK-420 and BYK-8420.
7. Use of a thermochromic emissivity coating according to any one of claims 1 to 6 in the field of military camouflage.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1544390A (en) * | 2003-11-13 | 2004-11-10 | 同济大学 | Temperature induced emissivity reversibly variable material |
| CN107189550A (en) * | 2017-06-22 | 2017-09-22 | 中国人民解放军国防科学技术大学 | Inkjet printing vanadium dioxide water-based ink and its preparation method and application |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1544390A (en) * | 2003-11-13 | 2004-11-10 | 同济大学 | Temperature induced emissivity reversibly variable material |
| CN107189550A (en) * | 2017-06-22 | 2017-09-22 | 中国人民解放军国防科学技术大学 | Inkjet printing vanadium dioxide water-based ink and its preparation method and application |
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