Camouflage paint film and preparation method thereof

Abstract

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

Description

Technical Field

[0001] The invention relates to the technical field of functional coatings, and in particular to a camouflage paint film and a preparation method thereof. Background Art

[0002] Camouflage paint is used on the surface of military facilities and equipment to make it impossible for people to recognize the painted object with camouflaged colors. It can be used to camouflage itself and confuse the enemy under reconnaissance conditions such as visible light, infrared light, ultraviolet light, radar waves, etc. It mainly achieves camouflage through the selection of pigments and their different combinations. Camouflage paint is mostly used for military purposes, such as combat vehicles, tanks, artillery, radar, etc., and must have good adhesion, wear resistance, weather resistance, cold resistance, good water resistance, and resistance to corrosion by coal, gasoline and other media.

[0003] At present, chromium green pigment is mostly used to simulate the green spectral characteristics of camouflage functions, and the basic requirement of the same color as plants is achieved through empirical color matching or computer color matching. However, the reflectivity of chromium green in the near-infrared region shows a slow upward trend, which is quite different from the steep rise of plants in this band. A common method is to extract chlorophyll from plants or artificially synthesize chlorophyll. Such spectral characteristics have a high degree of fit with chlorophyll, but poor stability, easy degradation, and poor coloring power.

[0004] As the research on functional materials develops towards multi-band broadband, a low-infrared aluminum-based composite paint film is prepared by adding flaky aluminum powder. Flaky aluminum powder has good hiding properties, physical shielding properties, and low infrared emissivity, but its metallic gloss is high and has high reflectivity in the visible light region, which is not conducive to the visible light protection of the target; although coloring pigments can reduce the metallic gloss of the paint film, their density is large, making it easier for a large amount of coloring pigments to deposit at the bottom of the paint film and agglomerate, making it difficult to evenly cover the surface of the flaky aluminum powder, thereby reducing the visible light reflectivity. Therefore, it is difficult to prepare a green camouflage paint film with both visible light protection and near-infrared protection. Summary of the invention

[0005] An embodiment of the present invention provides a camouflage paint film and a preparation method thereof. The camouflage paint film has the same color and spectrum as a typical vegetation background, and the functional paint film has a smooth surface, uniform color, low gloss, and both low infrared emissivity and excellent mechanical properties, and can meet visible light and near-infrared light camouflage requirements.

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

[0007] (1) mixing a green phthalocyanine compound, flaky aluminum powder and a diluent to obtain a modified green functional pigment;

[0008] (2) mixing the modified green functional pigment, dispersant, resin, defoamer, anti-precipitation agent, leveling agent and curing agent to obtain a functional coating;

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

[0010] Preferably, the flaky aluminum powder has a diameter of 10 to 20 μm and a thickness of 200 to 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 flaky 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 placed in a ball mill and mixed, and then the flaky 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 defoaming agent, the anti-precipitation 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 amount 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 the curing agent used is 10% to 12.5% ​​of the amount of the resin used.

[0020] Preferably, in step (2):

[0021] (21) mixing the modified green functional pigment, dispersant and resin to obtain a mixture; then adding a defoamer, an anti-settling agent and a leveling agent to the mixture and mixing again to obtain an initial coating;

[0022] (22) Add a curing agent to the initial coating and mix well, then allow the initial coating to stand for aging to obtain the functional coating.

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

[0024] Preferably, in step (2), the temperature of the static aging is 25 to 35° C., and the time is 20 to 40 minutes.

[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 to 50 μm.

[0027] In a second aspect, the present invention provides a camouflage paint film prepared by any preparation method described in the first aspect above.

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

[0029] The present invention forms a modified green functional pigment with a core-shell coating structure by mixing and stirring a green phthalocyanine compound with strong hiding power and flaky aluminum powder. At the same time, both the phthalocyanine compound and the chlorophyll porphyrin have a large π electron delocalization structure, so the prepared camouflage paint film can be the same color and spectrum as the typical vegetation background. The mechanical properties of the camouflage paint film are improved by adding resin, and the visible light-infrared camouflage compatibility function is satisfied. The prepared functional paint film has a smooth surface, uniform color, low gloss, low infrared emissivity and excellent mechanical properties, and has a wide range of application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a flow chart of a method for preparing a camouflage paint film provided by one embodiment of the present invention;

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

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

[0033] Figure 4 This is an emissivity curve of a camouflage paint film provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the present invention will be clearly and completely described in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all 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.

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

[0036] (1) mixing a green phthalocyanine compound, flaky aluminum powder and a diluent to obtain a modified green functional pigment;

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

[0038] (3) Spraying the functional coating to obtain a camouflage paint film.

[0039] In the present invention, a green phthalocyanine compound with strong hiding power and flaky aluminum powder are mixed and stirred to form a modified green functional pigment with a coating structure. At the same time, the phthalocyanine compound and the chlorophyll porphyrin both have a large π electron delocalization structure, so the prepared camouflage paint film can be the same color and spectrum as the typical vegetation background. By adding resin to meet the visible light-infrared compatibility function at the same time, the prepared functional paint film has a smooth surface, uniform color, low gloss, low infrared emissivity and excellent mechanical properties, and has a wide range of application value.

[0040] According to some preferred embodiments, the flaky aluminum powder has a diameter of 10 to 20 μm (for example, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm or 20 μm) and a thickness of 200 to 300 nm (for example, 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 the present invention, experiments have confirmed that the use of flaky aluminum powder of the above specifications as powder material enables the prepared camouflage paint film to have lower infrared emissivity and excellent infrared reflection performance; at the same time, compared with spherical aluminum powder, when achieving the same infrared emissivity, the use of flaky aluminum powder of the above specifications can further reduce the amount of aluminum powder added.

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

[0043] In the present invention, in order to obtain a green color with the same color and spectrum as the typical vegetation background, a green phthalocyanine compound with a large π electron delocalization structure like chlorophyll is selected, and the phthalocyanine compound has a spectral reflectance curve consistent with that of plants; at the same time, the green phthalocyanine compound has good stability, is not easy to degrade and has strong coloring power.

[0044] In the present invention, in order to further accurately obtain the green color in the national military standard based on the green phthalocyanine compound, the green phthalocyanine compound can also be toned by adding iron oxide red, iron oxide yellow, carbon black, etc. For example, the green phthalocyanine compound is toned according to the configuration of the mass ratio of iron oxide yellow and carbon black being (80-85): (117-123): (3.0-3.2), and the green color that fully meets the national military standard is obtained.

[0045] According to some preferred embodiments, the mass ratio of flaky 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 the present invention, since the lightness of the green camouflage color in the national military standard is low, the selection of green phthalocyanine compounds as coloring pigments can not only reduce the problem of high lightness caused by adding aluminum powder, but also by limiting the mass ratio of flaky aluminum powder and green phthalocyanine compounds to (20-25): (80-75), it can also avoid the problem that when the amount of coloring pigment is too much, it is deposited at the bottom of the paint film, agglomerates, and is difficult to evenly cover the surface of the flaky aluminum powder to reduce its visible light reflectivity; it can also avoid that when the amount of the coloring pigment is too low, the surface of the flaky aluminum powder cannot be covered to reduce the visible light reflectivity. Therefore, by limiting the mass ratio of flaky aluminum powder and green phthalocyanine compounds within the above range, compatible visible light camouflage and near-infrared camouflage reconnaissance can be prepared.

[0047] According to some preferred embodiments, in step (1), the green phthalocyanine compound and the diluent are placed in a ball mill and mixed, and then flaky aluminum powder is added and mixed to obtain a modified green functional pigment; preferably, the rotation speed of the ball mill is 1000-2000 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, which is not specifically limited here, and can be, for example, styrene. Specifically, the green phthalocyanine compound and the flaky aluminum powder are mixed uniformly by adding the diluent.

[0049] According to some preferred embodiments, the resin is polyurethane, silicone resin or 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 the resin to the 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 the present invention, it is experimentally confirmed that if the amount of resin is too high, the infrared emissivity of the prepared camouflage paint film will be high, and it will be difficult to achieve near-infrared camouflage; but if the amount of resin is too low, although the prepared camouflage paint film has low infrared emissivity, its mechanical properties are poor. Therefore, in order to take into account both low infrared emissivity and excellent mechanical properties, the mass ratio of resin to modified green functional pigment is selected to be (46-49): (54-51).

[0052] According to some preferred embodiments, in step (2): the mass ratio of the defoaming agent, the anti-precipitation agent and the 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 the defoamer is 0.1% to 0.5% (for example, 0.1%, 0.15%, 0.2%, 0.25%, 0.3%, 0.35%, 0.4%, 0.45% or 0.5%) of the sum of the amounts of the resin and the modified green functional pigment;

[0054] The amount of the dispersant is 1% to 3% of the amount of the resin (for example, 1%, 1.5%, 2%, 2.5% or 3%);

[0055] The amount of the curing agent used is 10% to 12.5% ​​of the amount of the resin used (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) mixing the modified green functional pigment, the dispersant and the resin to obtain a mixture; then adding a defoamer, an anti-settling agent and a leveling agent to the mixture and mixing again to obtain an initial coating;

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

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

[0060] It should be noted that the defoaming agent, anti-precipitation agent, dispersant, leveling agent and curing agent are all determined according to the selected resin and will not be described in detail here.

[0061] According to some more 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 the present invention, in order to further obtain a functional coating that is easy to spray, the amount of diluent used needs to be limited to avoid excessive diluent use, which results in the coating being too thin and causing the prepared camouflage paint film to take too long to dry; and to avoid too little diluent use, which results in the coating being too viscous and difficult to spray. Therefore, the mass ratio of the diluent to the 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 of static aging 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 a speed of 400 rpm for 5 minutes to obtain a mixture; then a defoamer, an anti-precipitation agent and a leveling agent are added to the mixture and stirred again to obtain an initial coating with a viscosity of 14 to 18 seconds; then a curing agent is added to the initial coating and stirred at a speed of 400 rpm for 5 minutes to obtain a functional coating, and then the coating is allowed to stand and mature for 20 to 40 minutes at 25 to 35° C. and normal pressure to obtain a functional coating.

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

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

[0067] Specifically, after the wet paint film is formed by air spraying, it is necessary to dry it at room temperature (for example, 25-30° C.) for 13-20 hours or at 60-70° C. for 1-2 hours to further complete the curing and remove the diluent to obtain the final camouflage paint film.

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

[0069] In the present invention, the thickness of the camouflage paint film is selected according to the specific use 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 paint film, which is prepared by the preparation method provided by the present invention.

[0071] In order to more clearly illustrate the technical solution and advantages of the present invention, a camouflage paint film and a preparation method thereof are described in detail below through several embodiments.

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

[0073] Example 1

[0074] (1) 80 parts of cobalt tetranitrophthalocyanine, 117 parts of iron yellow, and 3 parts of carbon black were weighed and added into a ball mill, and then 20 parts of a diluent (styrene) were added and ball milled at a speed of 1500 rpm for 20 minutes to prepare a green slurry; 20 parts of flaky aluminum powder with a diameter of 10 to 20 μm and a thickness of 200 to 300 nm were added to the green slurry, and the mixture was ball milled at a speed of 1500 rpm for 3 minutes to obtain a modified green functional pigment;

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

[0076] (3) Adjust the spraying process parameters, select the spray gun diameter of Φ1.5mm, and the spraying pressure of 0.5Mpa. After spraying, first dry the surface at room temperature for 30 minutes, then perform high temperature curing at 70℃ for 1 hour to obtain a camouflage paint film with a thickness of 40μm.

[0077] Example 2

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

[0079] Example 3

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

[0081] Example 4

[0082] Example 4 is substantially the same as Example 1, except that in step (1), the mass ratio of flaky aluminum powder to cobalt tetranitrophthalocyanine 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 amount of resin) are weighed and added to the modified green functional pigment, and stirred at a speed of 400 rpm for 5 minutes to obtain a mixture; then 0.90 parts of defoamer, 0.90 parts of anti-precipitation 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 to 18 seconds; then 26.25 parts of curing agent (isocyanate) (accounting for 12.5% ​​of the amount of resin) are added to the initial coating, stirred at a speed of 400 rpm for 5 minutes, and then allowed to stand and mature for 30 minutes at 25°C and normal pressure to obtain a functional coating; wherein the defoamer, anti-precipitation agent and leveling agent each account for 0.2% of the sum of the amounts of resin and modified green functional pigment.

[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 amount of resin) are weighed and added to the modified green functional pigment, and stirred at a speed of 400 rpm for 5 minutes to obtain a mixture; then 0.88 parts of defoamer, 0.88 parts of anti-precipitation 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 to 18 seconds; then 25 parts of curing agent (isocyanate) (accounting for 12.5% ​​of the amount of resin) are added to the initial coating, stirred at a speed of 400 rpm for 5 minutes, and then allowed to stand and mature for 30 minutes at 25°C and normal pressure to obtain a functional coating; wherein the defoamer, anti-precipitation agent and leveling agent each account for 0.2% of the sum of the amounts of resin and modified green functional pigment.

[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 caliber is selected to be Φ1.5 mm, and the spraying pressure is selected to be 0.5 MPa. After spraying, the surface is first dried at room temperature for 30 minutes, and then cured at room temperature at 25°C for 20 hours to obtain a camouflage paint film with a thickness of 50 μm.

[0091] Comparative Example 1

[0092] Comparative Example 1 is substantially the same as Example 1, except that in step (1), 80 parts of chrome green are used to replace 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 cobalt tetranitrophthalocyanine are weighed and added to a ball mill, and then 20 parts of a diluent (styrene) are added and ball-milled at a speed of 1500 rpm for 20 minutes to prepare a green slurry; 20 parts of flaky aluminum powder with a diameter of 10 to 20 μm and a thickness of 200 to 300 nm are added to the green slurry, and the mixture is ball-milled at a speed of 1500 rpm for 3 minutes to obtain a modified green functional pigment.

[0095] Comparative Example 3

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

[0097] The camouflage paint films obtained in Examples 1 to 8 and Comparative Examples 1 to 3 were used as samples, and the adhesion, flexibility, impact resistance, color difference, emissivity and other properties of these samples were tested, and the test results were shown in Table 1. Among them, the adhesion was measured according to the method specified in GB / T5210; the flexibility was measured according to the method specified in GB / T 1731; the impact resistance was measured according to the method specified in GB / T1732; the pencil hardness was measured according to the method specified in GB / T 6739; the paint film color difference was tested according to GJB 798 "Functional Coating Paint Film Color", and the spectral channel was tested according to GJB 7928-2012.

[0098] Table 1

[0099]

[0100] Figure 2 The figure shows a green camouflage paint film prepared in Example 1. Figure 3 , Figure 4 The spectral reflectance curve and emissivity curve 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 paint film prepared by the present invention has low gloss, low infrared emissivity, and good mechanical properties. The camouflage paint films prepared in Examples 1 to 8 have an adhesion less than level 1, a flexibility less than 1 mm, an impact strength higher than 50 kg*cm, a pencil hardness of more than 2H, and can pass wet heat, salt spray and acid-base tests; at the same time, the camouflage paint film takes into account the optical functional 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 3L*a*b* with the standard green paint film, has a gloss of less than 1 at 60°, and has an infrared emissivity between 0.75 and 0.8, and has broad application prospects. The green camouflage paint film prepared in Comparative Example 1 obviously does not have the characteristics of the same color and spectrum as the typical vegetation background. Similarly, since iron yellow and carbon black are not 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. Comparative Example 3 uses a thick flaky aluminum powder, which affects the infrared emissivity of the camouflage paint film.

[0101] 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 them; although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. The parts not described in detail in the present invention are well-known technologies of those skilled in the art.

Claims

1. A method for preparing a camouflage paint film, characterized in that: The preparation method comprises: (1) mixing a green phthalocyanine compound, flaky aluminum powder and a diluent to obtain a modified green functional pigment; (2) mixing the modified green functional pigment, dispersant, resin, defoamer, anti-precipitation agent, leveling agent and curing agent to obtain a functional coating; (3) Spraying the functional coating to obtain the camouflage paint film.

2. The preparation method according to claim 1, characterized in that: The diameter of the flaky aluminum powder is 10-20 μm and the thickness is 200-300 nm; and / or, The green phthalocyanine compounds include cobalt tetranitrophthalocyanine, iron tetranitrophthalocyanine, copper tetranitrophthalocyanine and zinc tetranitrophthalocyanine.

3. The preparation method according to claim 1, characterized in that: The mass ratio of the flaky aluminum powder to the green phthalocyanine compound is (20-25):(80-75); and / or, In step (1), the green phthalocyanine compound and the diluent are placed in a ball mill and mixed, and then the flaky 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.

4. The preparation method according to claim 1, characterized in that: The resin is polyurethane, silicone resin or high-hydroxyl acrylic polyurethane resin with a solid content of 70% to 80%.

5. The preparation method according to claim 1, characterized in that: In step (2): The mass ratio of the resin to the modified green functional pigment is (46-49):(54-51); and / or, The mass ratio of the defoamer, the anti-precipitation agent and the leveling agent is (0.1-0.5):(0.1-0.3):(0.1-0.3); The amount of the defoamer is 0.1% to 0.5% of the sum of the amount of the resin and the modified green functional pigment; The amount of the dispersant is 1% to 3% of the amount of the resin; The amount of the curing agent used is 10% to 12.5% ​​of the amount of the resin used.

6. The preparation method according to claim 1, characterized in that: In step (2): (21) mixing the modified green functional pigment, dispersant and resin to obtain a mixture; then adding a defoamer, an anti-settling agent and a leveling agent to the mixture and mixing again to obtain an initial coating; (22) Add a curing agent to the initial coating and mix well, then allow the initial coating to stand for aging to obtain the functional coating.

7. The preparation method according to claim 6, characterized in that: In step (2): The viscosity of the initial coating is 14 to 18 seconds; and / or, The temperature of the static aging is 25-35° C., and the time is 20-40 minutes.

8. The preparation method according to claim 1, characterized in that: In step (3): The spraying is performed by air spraying.

9. The preparation method according to claim 1, characterized in that: In step (3): The thickness of the camouflage paint film is 30 to 50 μm.

10. A camouflage paint film, characterized in that: The method is prepared by any one of claims 1 to 9.

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