Camouflage paint film and method for producing the same

Abstract

The application provides a camouflage paint film and a preparation method thereof, and relates to the technical field of functional coating, and the method comprises the following steps: (1) uniformly mixing a green phthalocyanine compound, flaky aluminum powder and a diluent to obtain a modified green functional pigment; (2) uniformly mixing the modified green functional pigment, a dispersing agent, a resin, a defoaming agent, an anti-settling agent, a leveling agent and a curing agent to obtain a functional coating; and (3) spraying the functional coating to obtain the camouflage paint film. The camouflage paint film prepared by the method is the same color and the same spectrum as a typical vegetation background, and the functional paint film has the advantages of a smooth surface, uniform color, low gloss, low infrared emissivity and excellent mechanical properties.

Description

Technical Field

[0001] This invention relates to the field of functional coatings technology, specifically to a camouflage coating film and its preparation method. Background Technology

[0002] Camouflage coatings are used on the surfaces of military facilities and equipment to make the coated objects unrecognizable through their camouflage colors. They can conceal themselves and deceive the enemy under reconnaissance conditions such as visible light, infrared light, ultraviolet light, and radar waves. Camouflage is primarily achieved through the selection and combination of pigments. Camouflage coatings are mainly used for military purposes, such as on armored vehicles, tanks, artillery, and radar systems, and must possess good adhesion, abrasion resistance, weather resistance, cold resistance, and good resistance to water, coal, gasoline, and other corrosive media.

[0003] Currently, most camouflage designs simulate the green spectral characteristics using chrome green pigment. This is achieved through empirical or computer-aided color matching to meet the basic requirement of matching plant colors. However, chrome green exhibits a slow increase in reflectance in the near-infrared region, which differs significantly from the sharp increase observed in plants in this band. A common approach is to extract chlorophyll from plants or synthesize chlorophyll artificially. While this method closely matches the spectral characteristics of chlorophyll, it suffers from poor stability, easy degradation, and weak tinting strength.

[0004] As research on functional materials advances towards multi-band broadband, low-infrared aluminum-based composite coatings have been prepared by adding flake aluminum powder. While flake aluminum powder possesses excellent covering, physical shielding, and low infrared emissivity, its high metallic luster and high reflectivity in the visible light region are detrimental to visible light protection. Although coloring pigments can reduce the metallic luster of the coating, their high density makes it easier for large amounts of pigment to deposit at the bottom of the coating, causing agglomeration and making it difficult to uniformly cover the surface of the flake aluminum powder to reduce visible light reflectivity. Therefore, it is difficult to prepare a green camouflage coating that provides both visible light and near-infrared protection. Summary of the Invention

[0005] This invention provides a camouflage coating and its preparation method. The camouflage coating is the same color and spectrum as a typical vegetation background. The functional coating has a smooth surface, uniform color, and low gloss. It also has low infrared emissivity and excellent mechanical properties, which can meet the requirements of visible light and near-infrared light camouflage.

[0006] In a first aspect, the present invention provides a method for preparing a camouflage coating film, the method comprising:

[0007] (1) A modified green functional pigment is obtained by mixing green phthalocyanine compound, flake aluminum powder and diluent.

[0008] (2) The modified green functional pigment, dispersant, resin, defoamer, anti-settling agent, leveling agent and curing agent are mixed evenly to obtain a functional coating;

[0009] (3) Spray the functional coating to obtain the camouflage paint film.

[0010] Preferably, the diameter of the flake aluminum powder is 10-20 μm and the thickness is 200-300 nm.

[0011] Preferably, the green phthalocyanine compound includes cobalt tetranitrophthalocyanine, iron tetranitrophthalocyanine, copper tetranitrophthalocyanine, and zinc tetranitrophthalocyanine.

[0012] Preferably, the mass ratio of the flake aluminum powder to the green phthalocyanine compound is (20-25):(80-75).

[0013] Preferably, in step (1), the green phthalocyanine compound and the diluent are mixed in a ball mill, and then the flake aluminum powder is added and mixed to obtain the modified green functional pigment; preferably, the rotation speed of the ball mill is 1000-2000 rpm.

[0014] Preferably, the resin is polyurethane, silicone resin, or high-hydroxyl acrylic polyurethane resin with a solid content of 70% to 80%.

[0015] Preferably, in step (2): the mass ratio of the resin to the modified green functional pigment is (46-49):(54-51).

[0016] Preferably, in step (2): the mass ratio of the defoamer, the anti-settling agent and the leveling agent is (0.1-0.5):(0.1-0.3):(0.1-0.3);

[0017] The amount of the defoamer is 0.1% to 0.5% of the sum of the amounts of the resin and the modified green functional pigment;

[0018] The amount of the dispersant is 1% to 3% of the amount of the resin;

[0019] The amount of curing agent used is 10% to 12.5% ​​of the amount of resin used.

[0020] Preferably, in step (2):

[0021] (21) The modified green functional pigment, dispersant and resin are mixed to obtain a mixture; then defoamer, anti-settling agent and leveling agent are added to the mixture and mixed again to obtain the initial coating.

[0022] (22) Add a curing agent to the initial coating and mix well, then let it stand to mature, to obtain the functional coating.

[0023] Preferably, in step (2): the viscosity of the initial coating is 14 to 18 s.

[0024] Preferably, in step (2): the temperature of the static curing is 25-35°C and the time is 20-40 min.

[0025] Preferably, in step (3): the spraying is performed by air spraying.

[0026] Preferably, in step (3), the thickness of the camouflage paint film is 30-50 μm.

[0027] Secondly, the present invention provides a camouflage coating film, which is prepared by any of the preparation methods described in the first aspect above.

[0028] Compared with the prior art, the present invention has at least the following beneficial effects:

[0029] This invention utilizes a green phthalocyanine compound with strong hiding power and flake aluminum powder to form a modified green functional pigment with a core-shell coating structure. Both the phthalocyanine compound and chlorophyll porphyrin possess large π-electron delocalization structures, thus the prepared camouflage film can blend seamlessly with typical vegetation backgrounds. By adding resin to improve the mechanical properties of the camouflage film, it also satisfies visible light-infrared camouflage compatibility. The resulting functional film has a smooth surface, uniform color, low gloss, low infrared emissivity, and excellent mechanical properties, making it suitable for a wide range of applications. Attached Figure Description

[0030] Figure 1 This is a flowchart of a method for preparing a camouflage paint film according to an embodiment of the present invention;

[0031] Figure 2 This is a physical image of a camouflage paint film provided in an embodiment of the present invention;

[0032] Figure 3 This is a spectral reflectance curve of a camouflage paint film provided in one embodiment of the present invention;

[0033] Figure 4 This is an emissivity curve of a camouflage paint film provided in one embodiment of the present invention. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0035] like Figure 1 As shown, the present invention provides a method for preparing a camouflage coating film, the method comprising:

[0036] (1) A modified green functional pigment is obtained by mixing green phthalocyanine compound, flake aluminum powder and diluent.

[0037] (2) Mix the modified green functional pigment, dispersant, resin, defoamer, anti-settling agent, leveling agent and curing agent to obtain functional coating;

[0038] (3) The functional coating is sprayed to obtain a camouflage film.

[0039] In this invention, a modified green functional pigment with a coating structure is formed by mixing and stirring a green phthalocyanine compound with strong hiding power and flake aluminum powder. Both the phthalocyanine compound and chlorophyll porphyrin possess large π-electron delocalization structures, thus the prepared camouflage film can be identical in color and spectrum to a typical vegetation background. By adding resin to simultaneously satisfy visible light-infrared compatibility, the prepared functional film has a smooth surface, uniform color, low gloss, low infrared emissivity, and excellent mechanical properties, making it suitable for a wide range of applications.

[0040] According to some preferred embodiments, the diameter of the flake aluminum powder is 10-20 μm (e.g., it can be 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm or 20 μm), and the thickness is 200-300 nm (e.g., it can be 200 nm, 210 nm, 220 nm, 230 nm, 240 nm, 250 nm, 260 nm, 270 nm, 280 nm, 290 nm or 300 nm).

[0041] In this invention, experiments have confirmed that using the above-mentioned flaky aluminum powder as the powder material results in a camouflage coating film with low infrared emissivity and excellent infrared reflection performance. At the same time, compared with spherical aluminum powder, using the above-mentioned flaky aluminum powder can further reduce the amount of aluminum powder added while achieving the same infrared emissivity.

[0042] According to some preferred embodiments, the green phthalocyanine compounds include cobalt tetranitrophthalocyanine, iron tetranitrophthalocyanine, copper tetranitrophthalocyanine, and zinc tetranitrophthalocyanine.

[0043] In this invention, in order to obtain a green color that is the same as that of typical vegetation background, a green phthalocyanine compound with a large π electron delocalization structure similar to chlorophyll is selected. This phthalocyanine compound has a spectral reflectance curve consistent with that of plants. At the same time, this green phthalocyanine compound has good stability, is not easily degraded, and has strong coloring power.

[0044] In this invention, to further accurately obtain the green color specified in the national military standard based on the green phthalocyanine compound, the green phthalocyanine compound can be color-adjusted by adding iron oxide red, iron oxide yellow, carbon black, etc. For example, by adjusting the color according to the mass ratio of green phthalocyanine compound to iron oxide yellow and carbon black of (80-85):(117-123):(3.0-3.2), a green color that fully conforms to the national military standard can be obtained.

[0045] According to some preferred embodiments, the mass ratio of flake aluminum powder to green phthalocyanine compound is (20-25):(80-75) (for example, it can be 20:80, 20.5:79.5, 21:79, 21.5:78.5, 22:78, 22.5:77.5, 23:77, 23.5:76.5, 24:76, 24.5:75.5 or 25:75).

[0046] In this invention, since the brightness of green camouflage color in national military standards is generally low, choosing a green phthalocyanine compound as the coloring pigment not only reduces the problem of high brightness caused by adding aluminum powder, but also avoids the problem of excessive pigment deposition at the bottom of the paint film and agglomeration, making it difficult to evenly cover the surface of the flake aluminum powder and reduce its visible light reflectance, when the amount of coloring pigment is too large. It also avoids the problem of insufficient pigment coverage of the flake aluminum powder surface to reduce visible light reflectance when the amount of pigment is too small. Therefore, by limiting the mass ratio of flake aluminum powder to green phthalocyanine compound within the above range, a camouflage and near-infrared camouflage reconnaissance system can be prepared.

[0047] According to some preferred embodiments, in step (1), the green phthalocyanine compound and diluent are mixed in a ball mill, and then flake aluminum powder is added and mixed to obtain a modified green functional pigment; preferably, the rotation speed of the ball mill is 1000 to 2000 rpm (for example, it can be 1000 rpm, 1500 rpm or 2000 rpm).

[0048] It should be noted that the diluent is an organic solvent, and no specific limitation is made here; for example, it can be styrene. Specifically, the diluent is added to ensure that the green phthalocyanine compound and the flake aluminum powder are mixed evenly.

[0049] According to some preferred embodiments, the resin is polyurethane, silicone resin, or a high-hydroxyl acrylic polyurethane resin with a solid content of 70% to 80% (e.g., 70%, 72%, 74%, 75%, 76%, 78%, or 80%).

[0050] According to some preferred embodiments, in step (2), the mass ratio of resin to modified green functional pigment is (46-49):(54-51) (for example, it can be 46:54, 46.5:53.5, 47:53, 47.5:52.5, 48:52, 48.5:51.5 or 49:51).

[0051] In this invention, experiments have shown that if the amount of resin is too high, the infrared emissivity of the prepared camouflage film will be high, making it difficult to achieve near-infrared camouflage; however, if the amount of resin is too low, although the prepared camouflage film will have low infrared emissivity, its mechanical properties will be poor. Therefore, in order to balance low infrared emissivity and excellent mechanical properties, the mass ratio of resin to modified green functional pigment is selected as (46-49):(54-51).

[0052] According to some preferred embodiments, in step (2): the mass ratio of defoamer, anti-settling agent and leveling agent is (0.1-0.5):(0.1-0.3):(0.1-0.3) (for example, it can be 0.1:0.1:0.1, 0.2:0.1:0.1, 0.3:0.1:0.1, 0.5:0.1:0.1, 0.1:0.2:0.1, 0.2:0.3:0.1, 0.3:0.2:0.1, 0.5:0.3:0.1, 0.1:0.1:0.2, 0.2:0.1:0.2, 0.3:0.1:0.3, 0.5:0.1:0.3, 0.5:0.2:0.2 or 0.5:0.3:0.3);

[0053] The amount of defoamer used is 0.1% to 0.5% of the sum of the amounts of resin and modified green functional pigment (for example, it can be 0.1%, 0.15%, 0.2%, 0.25%, 0.3%, 0.35%, 0.4%, 0.45% or 0.5%).

[0054] The amount of dispersant used is 1% to 3% of the amount of resin (for example, it can be 1%, 1.5%, 2%, 2.5% or 3%).

[0055] The amount of curing agent used is 10% to 12.5% ​​of the amount of resin (for example, it can be 10%, 10.5%, 11%, 11.5%, 12% or 12.5%).

[0056] According to some preferred embodiments, in step (2):

[0057] (21) Mix the modified green functional pigment, dispersant and resin to obtain a mixture; then add defoamer, anti-settling agent and leveling agent to the mixture and mix again to obtain the initial coating;

[0058] (22) Add curing agent to the initial coating and mix well, then let it stand to mature to obtain functional coating.

[0059] According to some preferred embodiments, in step (2): the viscosity of the initial coating is 14 to 18 s (for example, it can be 14 s, 15 s, 16 s, 17 s or 18 s).

[0060] It should be noted that the defoamer, anti-settling agent, dispersant, leveling agent and curing agent are all determined according to the resin used, and will not be specifically explained here.

[0061] According to some preferred embodiments, the mass ratio of the diluent to the green phthalocyanine compound in the initial coating is (80-85):(20-15) (for example, it can be 80:20, 80.5:19.5, 81:19, 81.5:18.5, 82:18, 82.5:17.5, 83:17, 83.5:16.5, 84:16, 84.5:15.5 or 85:15).

[0062] In this invention, to further obtain a functional coating that is easy to spray, it is also necessary to limit the amount of thinner used, so as to avoid excessive thinner, which would make the coating too thin and cause the drying time of the prepared camouflage film to be too long; at the same time, it is also necessary to avoid insufficient thinner, which would make the coating too viscous and difficult to spray. Therefore, the mass ratio of thinner to green phthalocyanine compound in the initial coating is limited to (80-85):(20-15).

[0063] According to some preferred embodiments, in step (2): the temperature for static curing is 25-35°C (for example, it can be 25°C, 28°C, 30°C, 32°C or 35°C), and the time is 20-40 min (for example, it can be 20 min, 25 min, 30 min, 35 min or 40 min).

[0064] Specifically, in step (2), the modified green functional pigment, dispersant and resin are stirred at 400 rpm for 5 min to obtain a mixture; then defoamer, anti-settling agent and leveling agent are added to the mixture and stirred again to obtain an initial coating with a viscosity of 14-18 s; then curing agent is added to the initial coating and stirred at 400 rpm for 5 min to obtain a mixture; then the mixture is allowed to stand and mature at 25-35℃ and normal pressure for 20-40 min to obtain a functional coating.

[0065] According to some preferred embodiments, in step (2): the viscosity of the initial coating is (for example, it can be 14s, 15s, 16s, 17s or 18s).

[0066] According to some preferred embodiments, in step (3): air spraying is used for spraying.

[0067] Specifically, after the paint film is made by air spraying, it needs to be dried at room temperature (e.g., 25-30°C) for 13-20 hours or at 60-70°C for 1-2 hours to further complete the curing and remove the thinner, so as to obtain the final camouflage paint film.

[0068] According to some preferred embodiments, in step (3): the thickness of the camouflage coating is 30 to 50 μm (for example, it can be 30 μm, 32 μm, 35 μm, 38 μm, 40 μm, 42 μm, 45 μm, 46 μm, 48 μm or 50 μm).

[0069] In this invention, the thickness of the camouflage paint film is selected according to the specific application requirements. However, if the camouflage paint film is too thick, although the covering effect is better, its mechanical properties are poor and it is easy to fall off; if the camouflage paint film is too thin, its covering effect is poor. Therefore, the preferred thickness of the camouflage paint film is 30 to 50 μm.

[0070] The present invention also provides a camouflage coating film prepared by the preparation method provided by the present invention.

[0071] To more clearly illustrate the technical solution and advantages of the present invention, the following detailed description of a camouflage coating and its preparation method is provided through several embodiments.

[0072] In the following examples, the mass of the green phthalocyanine compound, flake aluminum powder, diluent, dispersant, resin, defoamer, anti-settling agent, leveling agent, and curing agent are all expressed in parts by weight.

[0073] Example 1

[0074] (1) Weigh 80 parts of cobalt tetranitrophthalocyanine, 117 parts of iron yellow, and 3 parts of carbon black and add them to a ball mill. Then add 20 parts of diluent (styrene) and ball mill at 1500 rpm for 20 min to prepare a green slurry. Add 20 parts of flake aluminum powder with a diameter of 10-20 μm and a thickness of 200-300 nm to the green slurry and ball mill at 1500 rpm for 3 min to obtain a modified green functional pigment.

[0075] (2) Weigh 220 parts of polyurethane and 22 parts of dispersant (accounting for 1% of the resin amount) and add them to the modified green functional pigment. Stir at 400 rpm for 5 minutes to obtain a mixture. Then add 0.92 parts of defoamer, 0.92 parts of anti-settling agent and 0.92 parts of leveling agent to the mixture and stir again to obtain an initial coating with a viscosity of 14-18s. Then add 27.5 parts of curing agent (isocyanate) (accounting for 12.5% ​​of the resin amount) to the initial coating and stir at 400 rpm for 5 minutes to obtain a functional coating. The defoamer, anti-settling agent and leveling agent each account for 0.2% of the sum of the resin and modified green functional pigment amounts.

[0076] (3) Adjust the spraying process parameters, select a spray gun nozzle diameter of Φ1.5mm and a spraying pressure of 0.5Mpa. After spraying, allow the coating to dry at room temperature for 30min, then allow it to cure at 70℃ for 1h to obtain a camouflage paint film with a thickness of 40μm.

[0077] Example 2

[0078] Example 2 is basically the same as Example 1, except that in step (1), the mass ratio of flake aluminum powder to tetranitrophthalocyanine cobalt is 21:79.

[0079] Example 3

[0080] Example 3 is basically the same as Example 1, except that in step (1), the mass ratio of flake aluminum powder to tetranitrophthalocyanine cobalt is 22:78.

[0081] Example 4

[0082] Example 4 is basically the same as Example 1, except that in step (1), the mass ratio of flake aluminum powder to tetranitrophthalocyanine cobalt is 23:77.

[0083] Example 5

[0084] Example 5 is basically the same as Example 1, except that: in step (2), 210 parts of polyurethane and 21 parts of dispersant (accounting for 1% of the resin amount) are weighed and added to the modified green functional pigment, and stirred at 400 rpm for 5 minutes to obtain a mixture; then 0.90 parts of defoamer, 0.90 parts of anti-settling agent and 0.90 parts of leveling agent are added to the mixture and stirred again to obtain an initial coating with a viscosity of 14-18s; then 26.25 parts of curing agent (isocyanate) (accounting for 12.5% ​​of the resin amount) are added to the initial coating and stirred at 400 rpm for 5 minutes to obtain a functional coating. The coating is then allowed to stand and mature at 25°C and normal pressure for 30 minutes to obtain a functional coating; wherein the defoamer, anti-settling agent and leveling agent each account for 0.2% of the sum of the resin and modified green functional pigment amounts.

[0085] Example 6

[0086] Example 6 is basically the same as Example 1, except that: in step (2), 200 parts of polyurethane and 20 parts of dispersant (accounting for 1% of the resin amount) are weighed and added to the modified green functional pigment, and stirred at 400 rpm for 5 minutes to obtain a mixture; then 0.88 parts of defoamer, 0.88 parts of anti-settling agent and 0.88 parts of leveling agent are added to the mixture and stirred again to obtain an initial coating with a viscosity of 14-18s; then 25 parts of curing agent (isocyanate) (accounting for 12.5% ​​of the resin amount) are added to the initial coating and stirred at 400 rpm for 5 minutes to obtain a functional coating. The coating is then allowed to stand and mature at 25°C and normal pressure for 30 minutes to obtain a functional coating; wherein the defoamer, anti-settling agent and leveling agent each account for 0.2% of the sum of the resin and modified green functional pigment amounts.

[0087] Example 7

[0088] Example 7 is basically the same as Example 1, except that in step (2), 22 parts of curing agent (isocyanate) (accounting for 10% of the amount of resin) are added.

[0089] Example 8

[0090] Example 8 is basically the same as Example 1, except that in step (3), the spraying process parameters are adjusted, the spray gun nozzle diameter is selected as Φ1.5mm, and the spraying pressure is 0.5Mpa. After spraying, the surface is dried at room temperature for 30min, and then cured at room temperature at 25℃ for 20h to obtain a camouflage paint film with a thickness of 50μm.

[0091] Comparative Example 1

[0092] Comparative Example 1 is basically the same as Example 1, except that in step (1), 80 parts of chromium green are used instead of 80 parts of cobalt tetranitrophthalocyanine.

[0093] Comparative Example 2

[0094] Comparative Example 2 is basically the same as Example 1, except that in step (1), 80 parts of tetranitrophthalocyanine cobalt were weighed and added to a ball mill, and then 20 parts of diluent (styrene) were added and ball milled at 1500 rpm for 20 min to prepare a green slurry; 20 parts of flake aluminum powder with a diameter of 10-20 μm and a thickness of 200-300 nm were added to the green slurry and ball milled at 1500 rpm for 3 min to obtain a modified green functional pigment.

[0095] Comparative Example 3

[0096] Comparative Example 3 is basically the same as Example 1, except that in step (1), 20 parts of flake aluminum powder with a diameter of 10-20 μm and a thickness of 500 nm are added.

[0097] The camouflage coatings obtained in Examples 1 to 8 and Comparative Examples 1 to 3 were used as samples. Adhesion, flexibility, impact resistance, color difference, and emissivity were tested on these samples, and the test results are shown in Table 1. Adhesion was measured according to the method specified in GB / T 5210; flexibility was measured according to the method specified in GB / T 1731; impact resistance was measured according to the method specified in GB / T 1732; pencil hardness was measured according to the method specified in GB / T 6739; color difference was tested according to GJB 798 "Functional Coatings - Coating Film Colors"; and spectral channels were tested according to GJB 7928-2012.

[0098] Table 1

[0099]

[0100] Figure 2 A physical image of the green camouflage paint film prepared in Example 1 is shown. Figure 3 , Figure 4 The spectral reflectance and emissivity curves of the green camouflage paint film prepared in Example 1 are shown respectively. Figure 3 and Figure 4As can be seen from the data in Table 1, the camouflage coating prepared by this invention has low gloss, low infrared emissivity, and good mechanical properties. The camouflage coatings prepared in Examples 1 to 8 have an adhesion grade of less than 1, a flexibility of less than 1 mm, an impact strength of more than 50 kg*cm, a pencil hardness of more than 2H, and can pass damp heat, salt spray, and acid and alkali tests. At the same time, the camouflage coating meets the optical performance requirements of 0.4 to 14 μm, meets the spectral channel requirements of green preparation at 0.4 to 1.2 μm, has a color difference of less than 3 L*a*b* from the standard green coating, a 60° gloss of less than 1, and an infrared emissivity between 0.75 and 0.8, showing broad application prospects. The green camouflage paint film prepared in Comparative Example 1 obviously does not have the characteristic of being the same color and spectrum as the typical vegetation background. Similarly, since no iron oxide yellow or carbon black was added for color adjustment in Comparative Example 2, the green camouflage paint film prepared still has a large color difference from the standard green in the national military standard. The infrared emissivity of the camouflage paint film in Comparative Example 3 was affected by the thicker thickness of the flake aluminum powder used.

[0101] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. The parts of the present invention not described in detail are techniques known to those skilled in the art.

Claims

1. A method for preparing a camouflage paint film, characterized by, The preparation method comprises: (1) mixing a green phthalocyanine compound, flaky aluminum powder and a diluent to obtain a modified green functional pigment; the diameter of the flaky aluminum powder is 10-20 μm, and the thickness is 200-300 nm; the green phthalocyanine compound comprises one of tetranitro phthalocyanine cobalt, tetranitro phthalocyanine iron, tetranitro phthalocyanine copper and tetranitro phthalocyanine zinc; the mass ratio of the flaky aluminum powder to the green phthalocyanine compound is (20-25):(80-75); (2) mixing the modified green functional pigment, a dispersing agent, a resin, an antifoaming agent, an anti-settling agent, a leveling agent and a curing agent to obtain a functional coating; (3) spraying the functional coating to obtain a camouflage paint film.

2. The preparation method according to claim 1, wherein: in step (1), the green phthalocyanine compound and the diluent are mixed in a ball mill, and then the flaky aluminum powder is added and mixed to obtain the modified green functional pigment.

3. The preparation method according to claim 2, wherein: the rotation speed of the ball mill is 1000-2000 rpm.

4. The preparation method according to claim 1, wherein: the resin is polyurethane, silicone resin or high-hydroxyl acrylate polyurethane resin with a solid content of 70-80%.

5. The method of claim 1, wherein, in step (2): the mass ratio of the resin to the modified green functional pigment is (46-49):(54-51).

6. The method of claim 1, wherein, in step (2): the mass ratio of the antifoaming agent, the anti-settling agent and the leveling agent is (0.1-0.5):(0.1-0.3):(0.1-0.3); the amount of the antifoaming agent is 0.1-0.5% of the total amount of the resin and the modified green functional pigment; the amount of the dispersing agent is 1-3% of the amount of the resin; the amount of the curing agent is 10-12.5% of the amount of the resin.

7. The preparation method according to claim 1, characterized in that, in step (2): (21) mixing the modified green functional pigment, a dispersing agent and a resin to obtain a mixture; then adding an antifoaming agent, an anti-settling agent and a leveling agent to the mixture and mixing again to obtain an initial coating; (22) adding a curing agent to the initial coating and mixing, and then standing and curing to obtain the functional coating.

8. The production method according to claim 7, characterized by, in step (2): the viscosity of the initial coating is 14-18 s.

9. The preparation method according to claim 7, characterized in that, in step (2): the standing and curing temperature is 25-35℃, and the time is 20-40 min.

10. The method of claim 1, wherein, in step (3): the spraying is air spraying.

11. The method of claim 1, wherein, in step (3): the thickness of the camouflage paint film is 30-50 μm.

12. A camouflage paint film, characterized by, prepared by the preparation method in any one of claims 1-11.

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