Black coating with adjustable infrared emissivity as well as preparation method and application of black coating

Abstract

The invention relates to a black coating with adjustable infrared emissivity and a preparation method and application thereof, and belongs to the technical field of optical and infrared coatings, the black coating comprises a black filler, resin and flaky aluminum powder in a mass ratio of 1: (0.3-1.5): (0-2.2). The black coating provided by the invention is black in the visible light wave band and has high visible light absorptivity and low infrared emissivity, and the infrared wave emissivity of the coating and the temperature under infrared thermal imaging can be regulated and controlled by regulating the dosage ratio of the flaky aluminum powder to the black filler in the black coating; and the use requirements of three-dimensional visualization effects of the planar model in the visible light band and the infrared band in different regions, different seasons and different moments can be met.

Description

Technical Field

[0001] The invention relates to the technical field of optics and infrared coatings, and in particular to a black coating with adjustable infrared emissivity and a preparation method and application thereof. Background Art

[0002] With the development of optical detection technology, the three-dimensional visualization effect of plane models is not limited to visible light. At the same time, the three-dimensional visualization effect of infrared thermal imaging has also received widespread attention. The design of visible light shadows and infrared shadows is extremely important for achieving the three-dimensional visualization effect of plane models. To achieve the reproduction of visible light shadows and infrared shadows of plane models, materials with high visible light absorption and low infrared emission are required. However, traditional infrared low-emissivity materials mainly include metal materials. Metals usually have a high gloss and high visible light reflectivity, which are not suitable for visible light shadow reproduction.

[0003] Therefore, there is an urgent need to design a black coating with high visible light absorption rate and adjustable infrared emissivity to meet the requirements of three-dimensional visualization effects of plane models in visible light bands and infrared bands. Summary of the invention

[0004] In response to one or more technical problems existing in the prior art, the present invention provides a black coating with adjustable infrared emissivity, and a preparation method and application thereof. The black coating provided by the present invention appears black in the visible light band, has high visible light absorptivity and low infrared emissivity, and by adjusting the dosage ratio of flaky aluminum powder and black filler in the black coating, the infrared wave emissivity of the coating and the temperature under infrared thermal imaging can be regulated, which can meet the use requirements of three-dimensional visualization effects of plane models in the visible light band and infrared band in different regions, seasons and times.

[0005] In a first aspect, the present invention provides a black coating with adjustable infrared emissivity, wherein the black coating comprises a black filler, a resin and flaky aluminum powder in a mass ratio of 1:0.3 to 1.5:0 to 2.2.

[0006] Preferably, the black coating comprises black filler, resin and flaky aluminum powder in a mass ratio of 1:0.3-1.5:0.5-2.2.

[0007] Preferably, the resin is acrylic resin.

[0008] Preferably, the black filler is one or more of carbon black, graphene, and carbon nanotubes.

[0009] Preferably, the flake size of the flaky aluminum powder is 5 to 10 μm.

[0010] Preferably, the absorption rate of the black coating in the 380-760 nm band is greater than 85%.

[0011] Preferably, the infrared emissivity of the black coating in the infrared band is adjustable; the ranges of the infrared emissivity at 4 μm and 10 μm are 0.55 to 0.89 and 0.30 to 0.86, respectively.

[0012] In a second aspect, the present invention provides a method for preparing the black coating with adjustable infrared emissivity as described in the first aspect, the preparation method comprising:

[0013] S1. Mix the resin, black filler, flaky aluminum powder and dispersant to obtain a black coating slurry; the mass ratio of the black filler, the resin and the flaky aluminum powder is 1:0.3~1.5:0~2.2;

[0014] S2. Distribute the black coating slurry on a substrate to obtain a black coating with adjustable infrared emissivity.

[0015] Preferably, the amount of the dispersant is 0.5-2% of the total mass of the resin, the black filler and the flaky aluminum powder; preferably, the dispersant is one or more of silane coupling agent, stearic acid, sodium dodecylbenzene sulfonate and polyethylene glycol.

[0016] The present invention, in a third aspect, provides an application of the black coating with adjustable infrared emissivity as described in the first aspect, which is applied to realize three-dimensional visualization of a plane model in the visible light and infrared bands.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects:

[0018] The black coating provided by the present invention is black in the visible light band, has high visible light absorptivity and low infrared emissivity, and by adjusting the dosage ratio of flaky aluminum powder and black filler in the black coating, the infrared emissivity of the coating and the temperature under infrared thermal imaging can be regulated, which can meet the use requirements of the three-dimensional visualization effect of the plane model in the visible light band and infrared band in different regions, different seasons and different times. The coating has an absorptivity of greater than 85% in the visible light band (380-760nm band), and an adjustable infrared emissivity in the infrared band (3-5μm and 8-14μm), and the infrared emissivity ranges at 4μm and 10μm are 0.55-0.89 and 0.30-0.86 respectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 is a physical picture of the black coating obtained in Examples 1-4 of the present invention under visible light;

[0021] Figure 2 is a distribution diagram of the absorptivity of the black coatings prepared in Examples 1-4 of the present invention in the visible light band;

[0022] Figure 3 is a distribution diagram of the infrared emissivity of the black coatings prepared in Examples 1-4 of the present invention;

[0023] Figure 4 It is an infrared thermal imaging picture of the black coating prepared in Examples 1-4 of the present invention.

[0024] Figure 5 It is a three-dimensional visualization effect diagram of a plane model constructed by the black coating prepared in Example 4 of the present invention under visible light and infrared thermal imaging. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] In a first aspect, the present invention provides a black coating with adjustable infrared emissivity, wherein the black coating comprises a black filler, a resin and flaky aluminum powder in a mass ratio of 1:0.3 to 1.5:0 to 2.2.

[0027] The black coating provided by the present invention is black in the visible light band, has high visible light absorptivity and low infrared emissivity, and by adjusting the dosage ratio of flaky aluminum powder and black filler in the black coating, the infrared emissivity of the coating and the temperature under infrared thermal imaging can be regulated, which can meet the use requirements of the three-dimensional visualization effect of the plane model in the visible light band and infrared band in different regions, different seasons and different times. The coating has an absorptivity of greater than 85% in the visible light band (380-760nm band), and an adjustable infrared emissivity in the infrared band (3-5μm and 8-14μm). The infrared emissivity ranges at 4μm and 10μm are 0.55-0.89 and 0.30-0.86, respectively. It should be noted that the two bands of 3-5μm and 8-14μm are atmospheric windows, and general infrared imaging is usually in these two windows, so this patent focuses on the adjustability of the infrared emissivity of the coating in the above two bands.

[0028] According to some preferred embodiments, the black coating comprises black filler, resin and flaky aluminum powder in a mass ratio of 1:0.3 to 1.5:0.5 to 2.2. In the present invention, the mass ratio of black filler, resin and flaky aluminum powder is controlled within the above range to ensure that the obtained coating has high visible light absorptivity and lower infrared emissivity.

[0029] According to some preferred embodiments, the resin is an acrylic resin.

[0030] According to some preferred embodiments, the black filler is one or more of carbon black, graphene, and carbon nanotubes.

[0031] According to some preferred embodiments, the flake size of the flaky aluminum powder is 5 to 10 μm (for example, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm or 10 μm).

[0032] According to some preferred embodiments, the absorption rate of the black coating in the 380-760 nm band is greater than 85%.

[0033] According to some preferred embodiments, the infrared emissivity of the black coating in the infrared band is adjustable, and the ranges of the infrared emissivity at 4 μm and 10 μm are 0.55-0.89 and 0.30-0.86, respectively.

[0034] In a second aspect, the present invention provides a method for preparing the black coating with adjustable infrared emissivity as described in the first aspect, the preparation method comprising:

[0035] S1. Mix the resin, black filler, flaky aluminum powder and dispersant to obtain a black coating slurry; the mass ratio of the black filler, the resin and the flaky aluminum powder is 1:0.3~1.5:0~2.2;

[0036] S2. Distribute the black coating slurry on a substrate to obtain a black coating with adjustable infrared emissivity.

[0037] In some specific embodiments of the present invention, the preparation method of the black coating includes: uniformly dispersing a mixture of flaky aluminum powder, resin and dispersant by mechanical stirring to obtain an aluminum powder slurry; mixing the aluminum powder slurry with a black filler, and mixing them by mechanical stirring or a three-roll grinding process to obtain a black coating slurry; finally, obtaining a black coating with adjustable infrared emissivity by scraping, spraying or brushing.

[0038] According to some preferred embodiments, the amount of the dispersant is 0.5-2% (for example, 0.5%, 1%, 1.5% or 2%) of the total mass of the resin, the black filler and the flaky aluminum powder; preferably, the dispersant is one or more of a silane coupling agent, stearic acid, sodium dodecylbenzene sulfonate, and polyethylene glycol.

[0039] The present invention, in a third aspect, provides an application of the black coating with adjustable infrared emissivity as described in the first aspect, which is applied to realize three-dimensional visualization of a plane model in the visible light and infrared bands.

[0040] The black coating provided by the present invention appears black in the visible light band, has high visible light absorptivity and low infrared emissivity, and the infrared wave emissivity is adjustable, which can meet the use requirements of three-dimensional visualization effects of plane models in the visible light band and infrared band.

[0041] The present invention can select black coatings with different infrared emissivity to modify the shadow part according to the different states of the main part and the shadow part of the plane model, so as to achieve the three-dimensional visualization effect of the plane model in the visible light and infrared bands.

[0042] In order to more clearly illustrate the technical solutions and advantages of the present invention, the present invention is further described below in conjunction with the examples. The present invention does not specifically limit the sources of the reagents used in the examples and comparative examples, and the reagents can be directly purchased or synthesized by themselves.

[0043] Example 1

[0044] 60 g of carbon black, 60 g of acrylic resin and sodium dodecylbenzene sulfonate (the amount used is 0.5% of the total mass of carbon black and organic resin) are dispersed by mechanical stirring and three-roll grinding to obtain a black slurry, and a black coating 1 is prepared by blade coating. Figure 1 (a) The coating has a visible light absorptivity of 94.0% (550 nm), infrared emissivity of 0.89 (4 μm) and 0.86 (10 μm), and a thermal imaging temperature of 69.0°C under summer sunlight.

[0045] Example 2

[0046] 60 g of flaky aluminum powder, 60 g of acrylic resin and sodium dodecylbenzene sulfonate (the amount used is 2% of the total mass of flaky aluminum powder, organic resin and carbon black) are dispersed by mechanical stirring to obtain aluminum powder slurry, and then 120 g of carbon black is added thereto, and three-roll grinding is performed to obtain a composite black slurry, and a black coating 2 is prepared by blade coating, as shown in FIG. Figure 1(b) The coating has a visible light absorptivity of 93.3% (550 nm), infrared emissivity of 0.81 (4 μm) and 0.72 (10 μm), and a thermal imaging temperature of 60.1°C under summer sunlight.

[0047] Embodiment 3:

[0048] 60 g of flaky aluminum powder, 60 g of acrylic resin and sodium dodecylbenzene sulfonate (the amount used is 1.5% of the total mass of flaky aluminum powder, organic resin and carbon black) are dispersed by mechanical stirring to obtain aluminum powder slurry, and then 60 g of carbon black is added thereto, and three-roll grinding is performed to obtain a composite black slurry, and a black coating 3 is prepared by blade coating, as shown in FIG. Figure 1 (c) The coating has a visible light absorptivity of 90.4% (550 nm), infrared emissivity of 0.68 (4 μm) and 0.50 (10 μm), and a thermal imaging temperature of 49.8°C under summer sunlight.

[0049] Example 4

[0050] 60 g of flaky aluminum powder, 60 g of acrylic resin and sodium dodecylbenzene sulfonate (the amount used is 1% of the total mass of flaky aluminum powder, organic resin and carbon black) are dispersed by mechanical stirring to obtain aluminum powder slurry, and then 40 g of carbon black is added thereto, and three-roll grinding is performed to obtain a composite black slurry, and a black coating 4 is prepared by blade coating, as shown in FIG. Figure 1 The coating has a visible light absorptivity of 87.6% (550 nm), infrared emissivity of 0.55 (4 μm) and 0.30 (10 μm), and a thermal imaging temperature of 34.6°C under summer sunlight.

[0051] Depend on Figure 2-3 It can be seen that by adjusting the dosage ratio of flaky aluminum powder and black filler, the infrared emissivity of the coating can be regulated on the basis of ensuring the visible light absorptivity, and as the dosage ratio of flaky aluminum powder and black filler increases, the absorptivity of visible light is not greatly affected, and the infrared emissivity decreases. The coatings prepared in Examples 1-4 of the present invention have high visible light absorptivity and low infrared emissivity, and the absorptivity in the 380-760nm band is greater than 85%. The infrared emissivity in the infrared band is adjustable. Since the 3-5μm and 8-14μm bands are atmospheric windows, general infrared imaging is usually in these two windows, so this patent focuses on the adjustability of the infrared emissivity of the coating in the above two bands. The infrared emissivity ranges at 4μm and 10μm are 0.55-0.89 and 0.30-0.86, respectively, which can meet the use requirements of the three-dimensional visualization effect of the plane model in the visible light band and the infrared band.

[0052] Depend on Figure 4It can be seen that by adjusting the dosage ratio of flaky aluminum powder and black filler, the infrared emissivity of the coating can be regulated on the basis of ensuring the visible light absorption rate, and then the temperature under infrared thermal imaging can be regulated, which can meet the needs of three-dimensional visualization effects of plane models in visible light bands and infrared bands in different regions, seasons and times.

[0053] Depend on Figure 5 It can be seen that by selecting a black coating with appropriate infrared emissivity to modify the shadow part of the plane model, the three-dimensional visualization effect of the plane model in the visible light band (left) and infrared band (right) can be achieved.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A black coating with adjustable infrared emissivity, characterized in that: The black coating comprises black filler, resin and flaky aluminum powder in a mass ratio of 1:0.3-1.5:0-2.

2.

2. The black coating with adjustable infrared emissivity according to claim 1, characterized in that: The black coating comprises black filler, resin and flaky aluminum powder in a mass ratio of 1:0.3-1.5:0.5-2.

2.

3. The black coating with adjustable infrared emissivity according to claim 1 or 2, characterized in that: The resin is acrylic resin.

4. The black coating with adjustable infrared emissivity according to claim 1 or 2, characterized in that: The black filler is one or more of carbon black, graphene, and carbon nanotubes.

5. The black coating with adjustable infrared emissivity according to claim 1 or 2, characterized in that: The flake size of the flaky aluminum powder is 5 to 10 μm.

6. The infrared emissivity adjustable black coating according to claim 1 or 2, characterized in that: The absorption rate of the black coating in the wavelength range of 380-760 nm is greater than 85%.

7. The black coating with adjustable infrared emissivity according to claim 1 or 2, characterized in that: The infrared emissivity of the black coating in the infrared band is adjustable; the ranges of the infrared emissivity at 4 μm and 10 μm are 0.55-0.89 and 0.30-0.86 respectively.

8. A method for preparing a black coating with adjustable infrared emissivity according to any one of claims 1 to 7, characterized in that: The preparation method comprises: S1. Mix the resin, black filler, flaky aluminum powder and dispersant to obtain a black coating slurry; the mass ratio of the black filler, the resin and the flaky aluminum powder is 1:0.3~1.5:0~2.2; S2. Distribute the black coating slurry on a substrate to obtain a black coating with adjustable infrared emissivity.

9. The preparation method according to claim 8, characterized in that: The amount of the dispersant is 0.5-2% of the total mass of the resin, the black filler and the flaky aluminum powder; preferably, the dispersant is one or more of silane coupling agent, stearic acid, sodium dodecylbenzene sulfonate and polyethylene glycol.

10. An application of a black coating with adjustable infrared emissivity according to any one of claims 1 to 7, characterized in that: It is used to realize three-dimensional visualization of plane models in visible light and infrared bands.

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