Color-adjustable low-emissivity camouflage cloth and preparation method thereof

Abstract

The invention belongs to the technical field of camouflage materials, and relates to color-adjustable low-emissivity camouflage cloth and a preparation method thereof. Comprising a substrate layer, and a low-emissivity layer and a surface color matching layer are sequentially arranged on the upper surface of the substrate layer from bottom to top; the low-emissivity layer is formed by coating a low-emissivity coating, and the surface toning layer is formed by coating a coloring coating; the low-reflectivity coating and the coloring coating are both formed by mixing a plurality of components in specific mass percent. The metal filler in the low-emissivity layer is a low-emissivity material, has the characteristic of low infrared emissivity, can reduce the surface infrared emissivity, realizes the characteristic of low infrared radiation of the camouflage cloth, enables the radiation temperature difference between the camouflage cloth and the surrounding background environment to be small, and effectively resists thermal infrared imaging reconnaissance.

Description

Technical Field

[0001] The invention belongs to the technical field of camouflage materials and relates to a color-adjustable low-emissivity camouflage cloth and a preparation method thereof. Background Art

[0002] Camouflage is a variety of measures to conceal the truth and show falsehood in order to conceal ourselves and deceive and confuse the enemy. There are usually the following methods: First, concealment, using natural conditions such as terrain, objects, and bad weather (fog, wind, rain, snow) to conceal the target or reduce the target's significant characteristics; second, shielding, that is, using natural conditions or artificial barriers to effectively block enemy detection; third, fusion, using materials such as paint and dyes to change the color or pattern of the target and shielding objects, so that the spectral reflection and radiation difference between the target and the background is close to or lower than the resolution of the test system, making it difficult for the enemy to find or identify; fourth, deception, using false target technology to deceive and confuse the enemy and attract the enemy's attention and vitality. Among them, the use of camouflage paint for camouflage is the most common and widely used method.

[0003] In this regard, the Chinese invention patent with application number 202011537568.9 and publication number CN112662254B discloses a visible-near-infrared hyperspectral camouflage coating, its preparation method and application, which is prepared from water-based resin, water-absorbing and water-retaining agent, network skeleton, color paste and water-based coating additives. The color paste is a mixture of at least three of silicon dioxide, chromium trioxide, nickel oxide, sodium copper chlorophyll, titanium dioxide, carbon black and zinc oxide. After absorbing water, the camouflage coating can simulate the visible and near-infrared spectra emitted or reflected by the plant surface, with the same color and spectrum as the plant background, and has visible-near-infrared hyperspectral camouflage capability.

[0004] However, the coating in the prior art must have a visible light-near infrared camouflage effect only after absorbing water, so the coating cannot be used in dry environments such as deserts; in addition, the color paste used in the coating can only have a good reflection effect in the near-infrared band (0.76-2.5μm). In the mid-infrared band (3-5μm), the emissivity of the color paste is relatively high and cannot have an infrared camouflage effect. Summary of the invention

[0005] The purpose of the present invention is to overcome the disadvantages of the prior art and to provide a color-adjustable low-emissivity camouflage cloth and a preparation method thereof.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A color-adjustable low-emissivity camouflage cloth comprises a base layer, wherein the upper surface of the base layer is provided with a low-emissivity layer and a surface color-adjusting layer in sequence from bottom to top; the low-emissivity layer is coated with a low-emissivity paint, and the surface color-adjusting layer is coated with a colored paint; the low-reflectivity paint and the colored paint are both mixed with a plurality of components in specific mass percentages.

[0008] Furthermore, the low reflectivity coating comprises the following components in percentage by mass: 10%-80% of a binder, 5%-50% of a metal filler, 0.1%-15% of a solvent, 0.01%-10% of a leveling agent, 0.01%-10% of a defoaming agent and 0.01%-10% of a dispersant.

[0009] Furthermore, the metal filler includes one or more of Au powder, Pt powder, Al powder, Cu powder, Ni powder or Ag powder.

[0010] Furthermore, the binder includes one or more of phenolic resin, silicone resin, epoxy resin, amino resin, polyurethane resin, polyimide resin, and modified polyethylene resin.

[0011] Furthermore, the solvent includes one or more of toluene, xylene, ethanol, n-butanol, n-octanol, ethyl acetate, acetone, propylene glycol methyl ether acetate, ethylene glycol monomethyl ether, and ethylene glycol diethyl ether.

[0012] Furthermore, the defoamer is a polyether-modified silicone defoamer or a non-silicon polymer defoamer.

[0013] Furthermore, the colored coating comprises the following components in percentage by mass: 50%-60% of water-based resin, 26%-36% of modified sodium zinc phosphate, 1.5%-8.5% of adhesion promoter, 0.5%-4.5% of flame retardant, 1%-4% of leveling agent and 0.01%-0.5% of toughening agent.

[0014] Furthermore, the modified sodium zinc phosphate includes one or more of aluminum-doped modified sodium zinc phosphate, copper-doped modified sodium zinc phosphate, yttrium-doped modified sodium zinc phosphate, manganese-doped modified sodium zinc phosphate, and cerium-doped modified sodium zinc phosphate.

[0015] Furthermore, the water-based resin includes one or more of water-based acrylic resin, water-based polyurethane resin, water-based epoxy resin, water-based phenolic resin, water-based alkyd resin, and water-based cellulose resin.

[0016] Furthermore, the leveling agent includes one of polyester-modified polydimethylsiloxane, hydroxyl-terminated polydimethylsiloxane, and polyether-modified polydimethylsiloxane.

[0017] In addition, the present invention also discloses a method for preparing a color-adjustable low-emissivity camouflage cloth, which comprises first mixing a plurality of components in specific mass percentages to form a low-reflectivity coating and a coloring coating, and then sequentially coating the low-emissivity coating and the coloring coating on the upper surface of the base layer from bottom to top to obtain a color-adjustable low-emissivity camouflage cloth.

[0018] Furthermore, the various components are mixed by stirring. When making a low-reflectivity coating, the stirring speed is 800r / min~1500r / min, and the stirring time is 15min~30min; when making a colored coating, the stirring speed is 1000r / min~2500r / min, and the stirring time is 10min~20min.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] First, the coloring paint of the present invention contains modified sodium zinc phosphate, and since modified sodium zinc phosphate is infrared transparent in the mid-infrared band, when infrared rays in the mid-infrared band are incident on the surface coloring layer, the infrared rays can easily pass through the surface coloring layer and enter the low emissivity layer below for reflection, thereby performing effective infrared camouflage. In addition, since the modified sodium zinc phosphate can have a green, white and black appearance, the surface coloring layer can simulate the background environment of woodland, snow and mountain, thereby effectively countering hyperspectral imaging reconnaissance in a variety of environments.

[0021] Second, the metal filler in the low-emissivity paint is a low-emissivity material with infrared low-emissivity characteristics, which can reduce the surface infrared emissivity, realize the infrared low-radiation characteristics of the camouflage cloth, and reduce the radiation temperature difference between the camouflage cloth and the surrounding background environment, effectively counteracting thermal infrared imaging reconnaissance. DETAILED DESCRIPTION

[0022] Here, exemplary embodiments will be described in detail, and the embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are only examples of devices consistent with some aspects of the present invention as detailed in the appended claims.

[0023] A color-adjustable low-emissivity camouflage cloth comprises a base layer, wherein a low-emissivity layer and a surface color-adjusting layer are sequentially arranged on the upper surface of the base layer from bottom to top; the low-emissivity layer is coated with a low-emissivity paint, and the surface color-adjusting layer is coated with a colored paint; the low-reflectivity paint and the colored paint are both mixed with a plurality of components in specific mass percentages.

[0024] In this embodiment: the low emissivity layer has the characteristic of low infrared emissivity, which can reduce the surface infrared emissivity, realize the infrared low radiation characteristic of the camouflage cloth, make the radiation temperature difference between the camouflage cloth and the surrounding background environment small, and effectively resist thermal infrared imaging reconnaissance;

[0025] The surface coloring layer is coated with a specific coloring paint. Since a certain component in the coloring paint is infrared transparent in the infrared band, when infrared rays in the mid-infrared band are incident on the surface coloring layer, the infrared rays can easily pass through the surface coloring layer and enter the low-emissivity layer below for reflection, thereby performing effective infrared camouflage. In addition, the surface coloring layer can have a green, white and black appearance, so the surface coloring layer can simulate the background environment of woodland, snow and mountain, thereby effectively countering hyperspectral imaging reconnaissance in a variety of environments.

[0026] The base layer is made of flexible cloth, such as cotton, linen, polyester, etc.

[0027] Further, the low reflectivity coating includes the following components in mass percentage: 10%-80% of a binder, 5%-50% of a metal filler, 0.1%-15% of a solvent, 0.01%-10% of a leveling agent, 0.01%-10% of a defoaming agent, and 0.01%-10% of a dispersant. This emissivity ratio can make the incidence meet the requirements, and the final emissivity test results are detailed in Table 14.

[0028] Preferably, the binder, metal filler, solvent, leveling agent, defoamer and dispersant can be adjusted according to actual needs. The mass percentage of the binder can be: 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%; the mass percentage of the metal filler can be: 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%; the mass percentage of the solvent can be 0.1%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, The mass percentage of the leveling agent can be: 0.1%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%; the mass percentage of the defoaming agent can be: 0.1%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%; the mass percentage of the dispersant can be 0.1%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%.

[0029] Furthermore, the metal filler includes one or more of Au powder, Pt powder, Al powder, Cu powder, Ni powder or Ag powder.

[0030] In the present embodiment, these metal fillers are low emissivity materials with low emissivity characteristics. Therefore, the low emissivity layer has infrared low emissivity characteristics, which can reduce the surface infrared emissivity, realize the infrared low radiation characteristics of the camouflage cloth, and make the radiation temperature difference between the camouflage cloth and the surrounding background environment smaller, effectively counteracting thermal infrared imaging reconnaissance. The metal fillers can be used in combination according to actual needs, such as: Cu powder and Au powder combination; Pt powder and Ni powder combination; Al powder and Cu powder combination.

[0031] Furthermore, the binder includes one or more of phenolic resin, silicone resin, epoxy resin, amino resin, polyurethane resin, polyimide resin, and modified polyethylene resin.

[0032] In this embodiment, the binder can be used in combination according to actual needs, such as: amino resin, epoxy resin, silicone resin combination; polyimide resin and polyurethane resin combination. The binder in the low-emissivity coating is the main film-forming substance used to wrap the metal filler. The binder is also used to enhance the bonding strength between the coating and the base layer after the coating is formed.

[0033] Furthermore, the solvent includes one or more of toluene, xylene, ethanol, n-butanol, n-octanol, ethyl acetate, acetone, propylene glycol methyl ether acetate, ethylene glycol monomethyl ether, and ethylene glycol diethyl ether.

[0034] In this embodiment, the solvents can be used in combination according to actual needs, for example, n-butanol is combined with ethyl acetate; ethylene glycol diethyl ether is combined with ethylene glycol monomethyl ether.

[0035] Furthermore, the defoaming agent includes one of a polydimethylsiloxane defoaming agent, a polyether-modified silicone defoaming agent or a non-silicon polymer defoaming agent.

[0036] In this embodiment, the defoaming agent can be used according to actual needs, for example, the defoaming agent can be polydimethylsiloxane.

[0037] Furthermore, the dispersant may be BYK-163 dispersant.

[0038] Furthermore, the colored coating comprises the following components in mass percentage: 50%-60% of water-based resin, 26%-36% of modified sodium zinc phosphate, 1.5%-8.5% of adhesion promoter, 0.5%-4.5% of flame retardant, 1%-4% of leveling agent and 0.01%-0.5% of toughening agent. The color, glossiness and color difference obtained according to the composition ratio meet the use requirements, will not affect the low emissivity layer, and the overall low emissivity is still maintained.

[0039] Preferably, the mass percentages of water-based resin, modified sodium zinc phosphate, adhesion promoter, flame retardant, leveling agent, toughening agent, and binder can be adjusted according to actual needs, such as the mass percentage of water-based resin can be: 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%; the mass percentage of modified sodium zinc phosphate can be: 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%; the mass percentage of adhesion promoter can be: The mass percentage of flame retardant can be: 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%; the mass percentage of leveling agent can be: 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%; the mass percentage of toughening agent can be: 0.01%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%.

[0040] Furthermore, the water-based resin includes one or more of water-based acrylic resin, water-based polyurethane resin, water-based epoxy resin, water-based phenolic resin, water-based alkyd resin, and water-based cellulose resin.

[0041] In this embodiment, the water-based resin can be used in combination according to actual needs, such as a combination of a water-based cellulose resin and a water-based phenolic resin. The water-based resin is used to enhance the bonding force between the water-based resin and the low-emissivity layer.

[0042] Furthermore, the modified sodium zinc phosphate includes one or more of aluminum-doped modified sodium zinc phosphate, copper-doped modified sodium zinc phosphate, yttrium-doped modified sodium zinc phosphate, manganese-doped modified sodium zinc phosphate, and cerium-doped modified sodium zinc phosphate.

[0043] In this embodiment, modified sodium zinc phosphate can be used in combination according to actual needs, for example, cerium-doped modified sodium zinc phosphate is combined with yttrium-doped modified sodium zinc phosphate; copper-doped modified sodium zinc phosphate is combined with aluminum-doped modified sodium zinc phosphate.

[0044] Furthermore, the flame retardant includes a halogen flame retardant, and the halogen flame retardant includes one or more of chlorinated alicyclic hydrocarbons, tetrachlorophthalic anhydride, decabromodiphenyl ether, decabromodiphenyl ethane, and hexabromocyclododecane.

[0045] In this embodiment, the flame retardants can be used in combination according to actual needs, for example, tetrachlorophthalic anhydride and decabromodiphenyl ether are combined.

[0046] Furthermore, the adhesion promoter can be selected from KH-470 silane coupling agent and KH-470 silane coupling agent.

[0047] Furthermore, the toughening agent may be PU.

[0048] Furthermore, the leveling agent includes one of polyester-modified polydimethylsiloxane, hydroxyl-terminated polydimethylsiloxane, and polyether-modified polydimethylsiloxane.

[0049] Among them: the leveling agent in the colored coating is of the same type as the leveling agent in the low-emissivity coating component, and also includes one of polyester-modified polydimethylsiloxane, hydroxyl-terminated polydimethylsiloxane, and polyether-modified polydimethylsiloxane.

[0050] In addition, the present invention also discloses a method for preparing a color-adjustable low-emissivity camouflage cloth, which comprises first mixing a plurality of components in specific mass percentages to form a low-reflectivity coating and a coloring coating, and then sequentially coating the low-emissivity coating and the coloring coating on the upper surface of the base layer from bottom to top to obtain a color-adjustable low-emissivity camouflage cloth.

[0051] Specifically, the following steps may be included:

[0052] Step 1: Stir and mix the binder, metal filler, solvent, leveling agent, defoamer and dispersant in a specific proportion to obtain a low emissivity coating;

[0053] Step 2: evenly coating the low emissivity coating on the base layer, and curing to obtain a low emissivity layer;

[0054] Step 3: stirring and mixing the water-based resin, modified sodium zinc phosphate, adhesion promoter, flame retardant, leveling agent and toughening agent according to a specific ratio to obtain a colored coating;

[0055] Step 4: evenly apply the coloring paint on the low emissivity layer, and obtain a surface coloring layer after curing.

[0056] The low-emissivity coating in step 1 and the colored coating in step 3 can be prepared in advance and then coated on the upper surface of the base layer from bottom to top.

[0057] Furthermore, the stirring speed in step 1 is 800 r / min to 1500 r / min, and the stirring time is 15 min to 30 min;

[0058] The stirring speed in step 3 is 1000 r / min to 2500 r / min, and the stirring time is 10 min to 20 min.

[0059] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with embodiments.

[0060] Example 1

[0061] This embodiment provides a color-adjustable low-emissivity camouflage cloth, which uses a flexible cloth as a substrate, and the substrate surface is coated with a low-emissivity layer and a surface color-adjusting layer in sequence from bottom to top. The low-emissivity layer and the surface color-adjusting layer are composed as shown in Tables 1 and 2 below:

[0062] Table 1 Low emissivity layer composition

[0063]

[0064] Table 2 Surface coloring layer components

[0065]

[0066] The preparation process is:

[0067] Step 1: Put phenolic resin, Al powder, xylene, polyester-modified polydimethylsiloxane, polydimethylsiloxane and BYK-163 dispersant into a stirrer according to the mass percentage of each component, and stir at a speed of 800 r / min for 30 minutes to obtain a low-emissivity coating.

[0068] Step 2: Evenly apply the low emissivity coating on the substrate by brushing, and solidify to obtain a low emissivity layer.

[0069] Step 3: put waterborne polyurethane resin, aluminum-doped modified sodium zinc phosphate, KH-470 silane coupling agent, chlorinated alicyclic hydrocarbons, polyester-modified polydimethylsiloxane and PU into a stirrer according to the mass percentage of each component, and stir at a speed of 1000 r / min for 20 minutes to obtain a colored coating.

[0070] Step 4: evenly apply the coloring paint on the low emissivity layer by brushing, and solidify to obtain a surface coloring layer.

[0071] In this way, the preparation of the color-adjustable low-emissivity camouflage cloth with a white surface imitating a snow background is completed.

[0072] Example 2

[0073] This embodiment provides a color-adjustable low-emissivity camouflage cloth, which uses a flexible cloth as a substrate, and the substrate surface is coated with a low-emissivity layer and a surface color-adjusting layer in sequence from bottom to top. The low-emissivity layer and the surface color-adjusting layer are composed as shown in Tables 3 and 4 below:

[0074] Table 3 Low emissivity layer composition

[0075]

[0076] Table 4 Surface coloring layer components

[0077]

[0078] The preparation process is:

[0079] Step 1: Put silicone resin, epoxy resin, Cu powder, Au powder, propylene glycol methyl ether acetate, polyether modified polydimethylsiloxane, polydimethylsiloxane and BYK-163 dispersant into a stirrer according to the mass percentage of each component, and stir at a speed of 1000 r / min for 20 minutes to obtain a low emissivity coating.

[0080] Step 2: Evenly apply the low emissivity coating on the substrate by brushing, and solidify to obtain a low emissivity layer.

[0081] Step 3: put water-based acrylic resin, cerium-doped modified sodium zinc phosphate, yttrium-doped modified sodium zinc phosphate, KH-470 silane coupling agent, decabromodiphenylethane, polyester-modified polydimethylsiloxane and PU into a stirrer according to the mass percentage of each component, and stir at a speed of 1800 r / min for 15 min to obtain a colored coating.

[0082] Step 4: evenly apply the coloring paint on the low emissivity layer by brushing, and solidify to obtain a surface coloring layer.

[0083] In this way, the preparation of the color-adjustable low-emissivity camouflage cloth with a white surface imitating a snow background is completed.

[0084] Example 3

[0085] This embodiment provides a color-adjustable low-emissivity camouflage cloth, which uses a flexible cloth as a substrate, and the substrate surface is coated with a low-emissivity layer and a surface color-adjusting layer in sequence from bottom to top. The compositions of the low-emissivity layer and the surface color-adjusting layer are shown in Tables 5 and 6 below:

[0086] Table 5 Low emissivity layer composition

[0087]

[0088] Table 6 Surface coloring layer components

[0089]

[0090] The preparation process is:

[0091] Step 1: put amino resin, epoxy resin, silicone resin, Ag powder, n-butanol, ethyl acetate, hydroxyl-terminated polydimethylsiloxane, polydimethylsiloxane and BYK-163 dispersant into a stirrer according to the mass percentage of each component, and stir at a speed of 1500 r / min for 15 minutes to obtain a low emissivity coating.

[0092] Step 2: Use a scraping method to evenly apply the low emissivity coating on the substrate, and solidify it to obtain a low emissivity layer.

[0093] Step 3: put water-based cellulose resin, water-based phenolic resin, copper-doped modified sodium zinc phosphate, KH-470 silane coupling agent, tetrachlorophthalic anhydride, decabromodiphenyl ether, polyester-modified polydimethylsiloxane and PU into a stirrer according to the mass percentage of each component, and stir at a speed of 2000 r / min for 12 minutes to obtain a colored coating.

[0094] Step 4: evenly apply the coloring paint on the low emissivity layer by brushing, and solidify to obtain a surface coloring layer.

[0095] In this way, the preparation of the green color-adjustable low-emissivity camouflage cloth imitating the woodland background is completed.

[0096] Example 4

[0097] This embodiment provides a color-adjustable low-emissivity camouflage cloth, which uses a flexible cloth as a substrate, and the substrate surface is coated with a low-emissivity layer and a surface color-adjusting layer in sequence from bottom to top. The compositions of the low-emissivity layer and the surface color-adjusting layer are shown in Tables 7 and 8 below:

[0098] Table 7 Low emissivity layer composition

[0099]

[0100]

[0101] Table 8 Surface coloring layer components

[0102]

[0103] The preparation process is:

[0104] Step 1: Put polyimide resin, polyurethane resin, Pt powder, Ni powder, ethylene glycol diethyl ether, ethylene glycol monomethyl ether, hydroxyl-terminated polydimethylsiloxane, polydimethylsiloxane and BYK-163 dispersant into a stirrer according to the mass percentage of each component, and stir at a speed of 1000 r / min for 25 minutes to obtain a low emissivity coating.

[0105] Step 2: Use a scraping method to evenly apply the low emissivity coating on the substrate, and solidify it to obtain a low emissivity layer.

[0106] Step 3: put waterborne epoxy resin, manganese-doped modified sodium zinc phosphate, KH-470 silane coupling agent, hexabromocyclododecane, polyester-modified polydimethylsiloxane and PU into a stirrer according to the mass percentage of each component, and stir at a speed of 2500 r / min for 10 minutes to obtain a colored coating.

[0107] Step 4: evenly apply the colored coating on the low emissivity layer by scraping, and solidify to obtain a surface coloring layer.

[0108] In this way, the preparation of the color-adjustable low-emissivity camouflage cloth with a black-purple surface imitating a mountain background is completed.

[0109] Example 5

[0110] This embodiment provides a color-adjustable low-emissivity camouflage cloth, which uses a flexible cloth as a substrate, and the substrate surface is coated with a low-emissivity layer and a surface color-adjusting layer in sequence from bottom to top. The low-emissivity layer and the surface color-adjusting layer are composed as shown in Tables 9 and 10 below:

[0111] Table 9 Low emissivity layer composition

[0112]

[0113] Table 10 Surface coloring layer components

[0114]

[0115] The preparation process is:

[0116] Step 1: Put modified polyethylene resin, Al powder, Cu powder, acetone, polyether modified polydimethylsiloxane, polydimethylsiloxane and BYK-163 dispersant into a stirrer according to the mass percentage of each component, and stir at a speed of 1000 r / min for 25 minutes to obtain a low emissivity coating.

[0117] Step 2: Use air spraying to evenly coat the low emissivity coating on the substrate, and solidify it to obtain a low emissivity layer.

[0118] Step 3: put waterborne alkyd resin, copper-doped modified sodium zinc phosphate, aluminum-doped modified sodium zinc phosphate, KH-470 silane coupling agent, decabromodiphenyl ether, hydroxyl-terminated polydimethylsiloxane and PU into a stirrer according to the mass percentage of each component, and stir at a speed of 2500 r / min for 10 minutes to obtain a colored coating.

[0119] Step 4: evenly apply the coloring paint on the low emissivity layer by air spraying, and solidify to obtain a surface coloring layer.

[0120] In this way, the preparation of the green color-adjustable low-emissivity camouflage cloth with a simulated mountain background is completed.

[0121] Example 6

[0122] This embodiment provides a color-adjustable low-emissivity camouflage cloth, which uses a flexible cloth as a substrate, and the substrate surface is coated with a low-emissivity layer and a surface color-adjusting layer in sequence from bottom to top. The low-emissivity layer and the surface color-adjusting layer are composed as shown in Tables 11 and 12 below:

[0123] Table 11 Low emissivity layer composition

[0124]

[0125]

[0126] Table 12 Surface coloring layer components

[0127]

[0128] The preparation process is:

[0129] Step 1: Put modified polyethylene resin, polyurethane resin, Al powder, Ni powder, toluene, ethanol, n-octanol, polyester-modified polydimethylsiloxane, polydimethylsiloxane and BYK-163 dispersant into a stirrer according to the mass percentage of each component, and stir at a speed of 1200 r / min for 20 minutes to obtain a low emissivity coating.

[0130] Step 2: Use air spraying to evenly coat the low emissivity coating on the substrate, and solidify it to obtain a low emissivity layer.

[0131] Step 3: According to the mass percentage of each component, waterborne polyurethane resin, yttrium-doped modified sodium zinc phosphate, manganese-doped modified sodium zinc phosphate, KH-470 silane coupling agent, tetrachlorophthalic anhydride, polyether-modified polydimethylsiloxane and PU are put into a stirrer, and stirred at a speed of 2300 r / min for 15 min to obtain a colored coating.

[0132] Step 4: evenly apply the coloring paint on the low emissivity layer by air spraying, and solidify to obtain a surface coloring layer.

[0133] In this way, the preparation of the color-adjustable low-emissivity camouflage cloth with a dark grey surface imitating a mountain background is completed.

[0134] The performance of the color-adjustable low-emissivity camouflage cloth prepared in Examples 1 to 6 was tested, and the test results are shown in Table 13.

[0135] Table 13 Performance test results

[0136]

[0137] It can be seen from Table 13 that the color difference between the color-adjustable low-emissivity camouflage cloth prepared in Examples 1 to 6 and the surrounding environment is no more than 3L*a*b*, the visible light brightness contrast is no more than 0.1, the near-infrared brightness contrast is no more than 0.2, and the 60° gloss is no more than 6 gloss units, which shows that the color-adjustable low-emissivity camouflage cloth has a visible light camouflage effect. And the average reflectivity of the color-adjustable low-emissivity camouflage cloth prepared in Examples 1 to 6 in the near-infrared and thermal infrared bands is 90%, indicating that the color-adjustable low-emissivity camouflage cloth has a camouflage effect in the near-infrared-mid-infrared band.

[0138] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0139] It should be understood that the present invention is not limited to what has been described above and that various modifications and changes may be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

1. A color-adjustable low-emissivity camouflage cloth, characterized in that: It comprises a base layer, and a low emissivity layer and a surface coloring layer are sequentially arranged on the upper surface of the base layer from bottom to top; the low emissivity layer is coated with a low emissivity paint, and the surface coloring layer is coated with a colored paint; the low reflectivity paint and the colored paint are both mixed by multiple components with specific mass percentages.

2. The color-adjustable low-emissivity camouflage cloth according to claim 1, characterized in that: The low reflectivity coating comprises the following components in percentage by mass: 10%-80% of a binder, 5%-50% of a metal filler, 0.1%-15% of a solvent, 0.01%-10% of a leveling agent, 0.01%-10% of a defoaming agent and 0.01%-10% of a dispersant.

3. The color-adjustable low-emissivity camouflage cloth according to claim 2, characterized in that: The metal filler includes one or more of Au powder, Pt powder, Al powder, Cu powder, Ni powder or Ag powder.

4. The color-adjustable low-emissivity camouflage cloth according to claim 2, characterized in that: The binder includes one or more of phenolic resin, silicone resin, epoxy resin, amino resin, polyurethane resin, polyimide resin and modified polyethylene resin.

5. The color-adjustable low-emissivity camouflage cloth according to claim 2, characterized in that: The solvent includes one or more of toluene, xylene, ethanol, n-butanol, n-octanol, ethyl acetate, acetone, propylene glycol methyl ether acetate, ethylene glycol monomethyl ether, and ethylene glycol diethyl ether.

6. The color-adjustable low-emissivity camouflage cloth according to claim 1, characterized in that: The colored coating comprises the following components in percentage by mass: 50%-60% of water-based resin, 26%-36% of modified sodium zinc phosphate, 1.5%-8.5% of adhesion promoter, 0.5%-4.5% of flame retardant, 1%-4% of leveling agent and 0.01%-0.5% of toughening agent.

7. The color-adjustable low-emissivity camouflage cloth according to claim 6, characterized in that: The modified sodium zinc phosphate includes one or more of aluminum-doped modified sodium zinc phosphate, copper-doped modified sodium zinc phosphate, yttrium-doped modified sodium zinc phosphate, manganese-doped modified sodium zinc phosphate, and cerium-doped modified sodium zinc phosphate.

8. The color-adjustable low-emissivity camouflage cloth according to claim 6, characterized in that: The water-based resin includes one or more of water-based acrylic resin, water-based polyurethane resin, water-based epoxy resin, water-based phenolic resin, water-based alkyd resin, and water-based cellulose resin.

9. The color-adjustable low-emissivity camouflage cloth according to claim 2 or 6, characterized in that: The leveling agent includes one of polyester modified polydimethylsiloxane, hydroxyl terminated polydimethylsiloxane and polyether modified polydimethylsiloxane.

10. A method for preparing a color-adjustable low-emissivity camouflage cloth according to claims 1 to 9, characterized in that: First, multiple components in specific mass percentages are mixed to form low-reflectivity paint and colored paint, and then the low-reflectivity paint and colored paint are sequentially coated on the upper surface of the base layer from bottom to top to obtain a color-adjustable low-reflectivity camouflage cloth.

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