A laser- and visible light compatible camouflage coating composition and its preparation method

Abstract

This invention relates to the field of fine chemical technology, and more particularly to a laser- and visible light compatible camouflage coating and its preparation method. The coating composition of this invention comprises the following raw materials in parts by weight: 15-50 parts of composite functional pigments and fillers, and 50-85 parts of binder; the binder consists of waterborne polyurethane resin and a curing agent; the mass ratio of waterborne polyurethane resin to curing agent is 4:1; the composite functional pigments and fillers include graphite and pigments / fillers; the mass ratio of graphite to pigments / fillers is 1-6:4-9. The coating prepared by this invention not only has outstanding laser stealth effect and excellent mechanical properties, but also has adjustable and controllable color, and outstanding visible light camouflage performance in natural environments. The key raw material, graphite, is inexpensive, which significantly reduces the overall cost of the coating compared to graphene coatings with equivalent laser stealth effects currently reported.

Description

Technical Field

[0001] This invention relates to the field of fine chemical technology, and in particular to a laser- and visible light compatible camouflage coating and its preparation method. Background Technology

[0002] Traditional camouflage coatings on various land-based equipment, such as command vehicles, missile launchers, tanks, and armored vehicles, only cover visible light color camouflage and lack laser absorption characteristics, making them highly susceptible to detection and destruction by highly sensitive laser detection equipment and laser-guided weapons. Therefore, laser stealth technology, which reduces and weakens the effectiveness of enemy laser detection equipment, is an important means to improve the wartime survivability of various land-based equipment.

[0003] Meanwhile, in the field of modern defense science and technology, multi-spectral compatible stealth technology has become a core support for improving the survivability of various equipment. It achieves low detectability simultaneously in multiple key electromagnetic bands, such as visible light and laser, through methods such as material micro-nano structure design and spectral synergistic modulation. Its core is to overcome the limitations of single-band stealth. Among these, visible-laser dual-spectrum compatible coatings, as key materials for stealth of ground equipment, must simultaneously meet two core requirements: first, maintaining consistent color characteristics with the natural environment in the visible light band to avoid visible light identification; and second, possessing low reflectivity at the 1.06 μm wavelength commonly used for laser detection to reduce the detection probability of laser-guided and ranging equipment, while also ensuring the mechanical stability required for engineering applications.

[0004] Traditional single-function coatings struggle to balance optical and mechanical properties. While some low near-infrared reflectivity coatings can meet laser stealth requirements, their appearance is ill-suited for visible light stealth in complex battlefield environments. Conventional visible light camouflage coatings often suffer from high laser reflectivity due to improper filler selection, significantly reducing their overall stealth effectiveness. Furthermore, coatings must withstand external forces such as vibration, friction, and temperature changes in complex battlefield environments. Their adhesion, flexibility, and impact resistance directly determine the durability of the stealth effect, placing higher demands on the selection of fillers and substrates. Meanwhile, while graphene shows significant potential for mechanical improvements, its high cost and market price severely restrict its large-scale engineering application in stealth coatings. Additionally, traditional coatings often use oil-based resins, which cause environmental and personnel pollution hazards due to the evaporation of strong solvents at the construction site.

[0005] Therefore, the key to achieving multi-spectral compatible stealth for various land-based equipment lies in solving the problems existing in traditional anti-counterfeiting coatings and providing a low-cost, environmentally friendly laser and visible light compatible camouflage coating with ultra-low near-infrared reflectivity, excellent mechanical properties, and adjustable and controllable color. Summary of the Invention

[0006] The purpose of this invention is to provide a laser- and visible light compatible camouflage coating and its preparation method, so that the prepared coating simultaneously possesses excellent ultra-low near-infrared reflectivity, natural environment camouflage performance, mechanical properties, environmental protection performance, and low cost advantages.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solution: One of the technical solutions of the present invention provides a coating composition comprising the following raw materials in parts by weight: 15-50 parts of composite functional pigments and fillers and 50-85 parts of binder; The adhesive is composed of a water-based polyurethane resin and a curing agent; the mass ratio of the water-based polyurethane resin to the curing agent is 4:1. The composite functional pigments and fillers include graphite and pigments and fillers; the mass ratio of graphite to pigments and fillers is 1~6:4~9.

[0008] The second technical solution of the present invention provides a method for preparing the above-mentioned coating composition, comprising the following steps: A water-based polyurethane resin and a curing agent are mixed in a certain mass ratio to obtain an adhesive; Graphite and pigments are mixed according to a mass ratio, and then a dispersant is added and the mixture is ground to obtain composite functional pigments. The binder and composite functional pigments and fillers are mixed according to the mass fractions to obtain the coating composition.

[0009] The third technical solution of the present invention provides a laser- and visible light compatible camouflage coating, which is formed by curing the above-mentioned coating composition.

[0010] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention uses waterborne polyurethane (PU) as a binder, low-cost graphite as a strong laser absorber, and inorganic substances such as chrome yellow, iron oxide yellow, and iron oxide blue as colorants to design and prepare a low-cost and environmentally friendly laser and visible light compatible camouflage coating. The prepared coating not only has outstanding laser stealth effect and excellent mechanical properties, but also has adjustable and controllable color and outstanding visible light camouflage performance in natural environments.

[0011] 2. The coating prepared by this invention has a low price for the key raw material graphite, which greatly reduces the overall cost of the coating compared to the graphene coatings with the same laser stealth effect that have been reported. Attached Figure Description

[0012] Figure 1 The reflectance spectrum of the graphite-medium chrome yellow composite brownish-brown laser-visible compatible coating prepared in this invention; Figure 2 This is a sample appearance diagram of the graphite-medium chrome yellow composite brownish-brown laser-visible light compatible coating prepared according to the present invention; Figure 3 The reflectance spectrum of the graphite-iron oxide yellow composite brown clay-colored laser-visible light compatible coating prepared in this invention; Figure 4 This is a sample appearance diagram of the graphite-iron oxide yellow composite brownish-brown laser-visible light compatible coating prepared in this invention; Figure 5 The reflectance spectrum of the green laser-visible light compatible coating in the graphite-yellow-blue pigment composite prepared in this invention; Figure 6 This is a sample appearance diagram of the green laser-visible light compatible coating in the graphite-yellow-blue pigment composite prepared according to the present invention. Detailed Implementation

[0013] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0014] It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the invention. Furthermore, with respect to numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Every smaller range between any stated value or intermediate value within a stated range, and any other stated value or intermediate value within said range, is also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0015] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. While only preferred methods and materials have been described herein, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of this invention. All references to this specification are incorporated by way of citation to disclose and describe methods and / or materials associated with those references. In the event of any conflict with any incorporated reference, the content of this specification shall prevail.

[0016] Various modifications and variations can be made to the specific embodiments described in this specification without departing from the scope or spirit of the invention, as will be apparent to those skilled in the art. Other embodiments derived from this specification will also be obvious to those skilled in the art. This application specification and embodiments are merely exemplary.

[0017] The terms “include,” “including,” “have,” “contain,” etc., used in this article are all open-ended terms, meaning that they include but are not limited to.

[0018] All raw materials used in this invention can be obtained commercially or prepared using existing technologies.

[0019] All room temperatures mentioned in this invention are calculated as 25±2℃.

[0020] The present invention provides a coating composition comprising the following raw materials in parts by weight: 15-50 parts of composite functional pigments and fillers and 50-85 parts of binder; The adhesive is composed of a water-based polyurethane resin and a curing agent; the mass ratio of the water-based polyurethane resin to the curing agent is 4:1. The composite functional pigments and fillers include graphite and pigments and fillers; the mass ratio of graphite to pigments and fillers is 1~6:4~9, for example, it can be 1:9, 2:8, 3:7, 4:6, 5:5 or 6:4, etc.

[0021] In this invention, the coating composition includes 15 to 50 parts of composite functional pigments and fillers, for example, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts or 50 parts, etc.

[0022] In this invention, the coating composition includes 50 to 85 parts of adhesive, for example, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts or 85 parts, etc.

[0023] The present invention also includes a dispersant, which accounts for 3 to 5% of the mass of the composite functional pigment and filler, for example, 3%, 4% or 5%.

[0024] In this invention, the dispersant is polyethylene glycol; the average molecular weight of the polyethylene glycol is 1800~2000, preferably 2000.

[0025] In a preferred embodiment of the present invention, the dispersant is PEG2000, and the purity of PEG2000 is 99%.

[0026] In this invention, PEG2000 is used as a pigment and filler interface modifier, which greatly improves the compatibility of pigments and fillers with waterborne polyurethane, solves the dispersion problem of pigments and fillers, and eliminates the need to use highly polluting organic solvents in coating formulation, giving the coating outstanding green and environmentally friendly characteristics.

[0027] In this invention, the pigments and fillers include one or more of chrome yellow, iron oxide yellow, and iron oxide blue; the particle size of the pigments and fillers is 300-500 mesh, for example, 300 mesh, 350 mesh, 400 mesh, 450 mesh, or 500 mesh.

[0028] In a preferred embodiment of the present invention, the chrome yellow pigment has a purity of 99% and a particle size of 400 mesh; the iron oxide yellow pigment has a purity of 80% and a particle size of 400 mesh; and the iron oxide blue pigment has a purity of 99% and a particle size of 400 mesh.

[0029] In this invention, inorganic colorants such as chrome yellow, iron oxide yellow, and iron oxide blue have the characteristics of good color stability and strong weather resistance, which can provide the coating with a camouflage appearance that meets the needs of the battlefield.

[0030] In this invention, the solid content of the waterborne polyurethane resin is 50%.

[0031] In this invention, waterborne polyurethane resin, due to its high bonding strength and excellent film-forming properties, can be used as the resin matrix for environmentally friendly coatings. It also has outstanding interfacial compatibility with most inorganic fillers, which can greatly improve the overall performance of the coating.

[0032] In this invention, the solid content of the curing agent is 42.9%.

[0033] In a preferred embodiment of the present invention, the curing agent is preferably liquid N-210 polyether.

[0034] In this invention, the particle size of the graphite is 2000~4000 mesh, for example, it can be 2000 mesh, 2500 mesh, 3000 mesh, 3500 mesh or 4000 mesh, etc.

[0035] In a preferred embodiment of the present invention, the purity of the graphite is 99%.

[0036] In this invention, graphite, as a typical layered carbon material, possesses excellent near-infrared laser light absorption properties. Its interlayer structure can effectively attenuate incident light energy, making it an ideal filler for preparing coatings with low near-infrared reflectivity. Furthermore, its price is much lower than that of graphene, which also exhibits strong laser absorption characteristics, thus providing a significant cost advantage.

[0037] The present invention also provides a method for preparing the above-mentioned coating composition, comprising the following steps: A water-based polyurethane resin and a curing agent are mixed in a certain mass ratio to obtain an adhesive; Graphite and pigments are mixed according to a mass ratio, and then a dispersant is added and the mixture is ground to obtain composite functional pigments. The binder and composite functional pigments and fillers are mixed according to the mass fractions to obtain the coating composition.

[0038] In this invention, the grinding speed is 80~1200 r / min, for example, it can be 80 r / min, 100 r / min, 500 r / min, 1000 r / min or 1200 r / min, etc., and the grinding time is 1~1.5 h, for example, it can be 1 h, 1.1 h, 1.2 h, 1.3 h, 1.4 h or 1.5 h, etc.

[0039] In a preferred embodiment of the present invention, the binder and composite functional pigments and fillers are thoroughly stirred according to the mass proportions until the coating composition has a yogurt-like consistency and can be uniformly flowed down.

[0040] The present invention also provides a laser- and visible light compatible camouflage coating, which is formed by curing the above-described coating composition.

[0041] In a preferred embodiment of the present invention, the laser- and visible light compatible camouflage coating is obtained by applying the above-described coating composition to the surface of a substrate and then drying and curing it.

[0042] In a preferred embodiment of the present invention, the curing temperature is room temperature and the curing time is 40 hours.

[0043] In a preferred embodiment of the present invention, the substrate is a tinplate substrate, the tinplate substrate having dimensions of 12 cm × 5 cm and a thickness of 0.28 mm.

[0044] In a preferred embodiment of the present invention, the tinplate substrate is sanded to give the substrate surface dense rough marks, the substrate is rinsed clean with anhydrous ethanol, and then dried to complete the pretreatment.

[0045] In a preferred embodiment of the present invention, 3-5g of the coating composition is applied to the surface of the substrate.

[0046] The laser-visible light compatible camouflage coating of the present invention, measured with a UV-3600 UV-VIS-NIR spectrophotometer, has a near-infrared reflectance of 3-6% at 1.06 μm. The color difference values ​​obtained by comparing the chromaticity values ​​measured with a 3nh-NR10QC colorimeter (manufactured by Sanen Technology Co., Ltd.) with the standard color sample are all less than 3. According to national standard GB1720-79 (89), the adhesion of the coating is grade 1 using a QFZII adhesion tester. According to national standard GB1731-93, the flexibility of the coating is 2 mm using a QTY-10A film cylindrical bending tester. According to national standard GB / T 1732-93, the impact resistance of the coating is 50 kg·cm using a QCJ impact strength tester. This coating features an ultra-low 1.06 μm near-infrared reflectivity, excellent mechanical properties, and a low-cost, environmentally friendly laser and visible light compatible camouflage coating with adjustable and controllable color. It is an ideal technical solution for achieving multi-spectral compatible stealth for various land-based equipment and is expected to be applied on a large scale in the field.

[0047] This invention features a simple preparation process, low product cost, ease of use, and environmental friendliness. It can be applied to the surfaces of various equipment such as camouflage nets, missile launchers, command vehicles, tanks, and armored vehicles, enabling them to possess outstanding laser stealth effects while also exhibiting excellent natural environment camouflage and mechanical protection properties. This invention has broad application prospects in the field of laser and visible light multi-spectral compatible stealth design and modification of various land-based equipment.

[0048] The technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0049] The substrates used in the following embodiments of the present invention are all pre-treated standard tinplate sheets with a size of 12 cm × 5 cm and a thickness of 0.28 mm. The pre-treatment method of the tinplate sheets is as follows: the substrate surface is polished with 360-grit sandpaper to make dense rough marks, the substrate is rinsed clean with an appropriate amount of anhydrous ethanol, and then dried for later use.

[0050] Example 1 (1) Weigh waterborne polyurethane resin (PU, solid content 50%) and curing agent (N-210 polyether, liquid, solid content 42.9%) at a mass ratio of 4:1, and mix them evenly to obtain an adhesive; (2) Select 4000 mesh graphite (99% purity) and 400 mesh medium chrome yellow pigment (99% purity) in a mass ratio of 3:7 to obtain composite functional pigments and fillers. Place the composite functional pigments and fillers in a planetary high-energy ball mill, add 5% of PEG2000 in total amount of composite functional pigments and fillers, and ball mill at 80 r / min for 1 h to obtain composite functional pigments and fillers.

[0051] (3) Weigh 80 parts of the binder and 20 parts of the composite functional pigments and fillers according to the mass ratio, put them in a clean plastic cup, and stir them thoroughly with a glass rod until the coating is yogurt-like and can be flowed evenly.

[0052] (4) 3 g of the above coating was applied to the surface of a pretreated tinplate substrate (12 cm × 5 cm, 0.28 mm thick) by glass rod scraping method. After drying and curing at room temperature for 40 h, a brownish-brown laser-visible light compatible composite coating was obtained.

[0053] The coatings formulated using this process system have high stability, and the pigments and fillers in the coatings will not precipitate or clump within 10 months.

[0054] The camouflage coating of this formulation, measured with a UV-3600 UV-VIS-NIR spectrophotometer, showed a near-infrared reflectance of 3.3% at 1.06 μm. Figure 1 ); According to national standard GB 1720-79 (89), the adhesion of the camouflage coating using the QFZII type adhesion tester is grade 1; according to national standard GB 1731-93, the flexibility of the camouflage coating using the QTY-10A type film cylindrical bending tester is 2 mm; and according to national standard GB / T 1732-93, the impact resistance of the camouflage coating using the QCJ type impact strength tester reaches 50 kg·cm. The color characteristics of the camouflage coating conform to the BE0811 brown earth color standard in GJB 795A. The color difference value obtained by comparing the colorimetric value measured by the 3nh-NR10QC colorimeter produced by Sanen Technology Co., Ltd. with the standard color sample is 2.01. Figure 2 ) Figure 1 The images show the reflectance spectra of coatings with different mass ratios of graphite and medium chrome yellow pigment, under the condition that other preparation conditions remain unchanged in Example 1. Figure 2 This is the corresponding sample appearance drawing.

[0055] Figure 1 In this context, when the mass ratio of graphite to medium chrome yellow pigment is 1:9, the corresponding... Figure 2 The leftmost image shows the coating appearance when the mass ratio of graphite to medium chrome yellow pigment is 2:8. Figure 2 The second image on the left shows the coating appearance when the mass ratio of graphite to medium chrome yellow pigment is 3:7 (Example 1). Figure 2 The third image from the left shows the coating appearance when the mass ratio of graphite to medium chrome yellow pigment is 4:6. Figure 2 The coating appearance diagram on the right (3rd in the right) shows the corresponding result when the mass ratio of graphite to medium chrome yellow pigment is 5:5. Figure 2 The rightmost image shows the appearance of graphite when the mass ratio of graphite to chrome yellow pigment is 6:4. Figure 2 The exterior view of the middle right 1; by Figure 1 and Figure 2 It can be seen that the reflectivity of the coating for 1.06 μm near-infrared light can be as low as below 4.9% under different graphite and pigment mass ratios, demonstrating outstanding laser stealth capabilities. With increasing graphite and pigment mass ratio, the 1.06 μm near-infrared reflectivity initially decreases and then increases, indicating that a suitable graphite and pigment mass ratio can achieve the lowest possible near-infrared reflectivity. Furthermore, changing the graphite and pigment mass ratio allows for adjustment of the coating's appearance color within the range of yellow-green and dark brown, meeting the needs of various color applications.

[0056] Example 2 (1) Weigh waterborne polyurethane resin (PU, solid content 50%) and curing agent (N-210 polyether, liquid, solid content 42.9%) at a mass ratio of 4:1, and mix them evenly to obtain an adhesive; (2) Select 4000 mesh graphite (99% purity) and 400 mesh iron oxide yellow pigment (80% purity) in a mass ratio of 3:7 to obtain composite functional pigments and fillers. Place the composite functional pigments and fillers in a planetary high-energy ball mill, add 5% of PEG2000 in total amount of composite functional pigments and fillers, and ball mill at 80 r / min for 1 h to obtain composite functional pigments and fillers.

[0057] (3) Weigh 75 parts of binder and 25 parts of composite functional pigments and fillers according to the mass ratio, put them in a clean plastic cup, and stir them thoroughly with a glass rod until the coating is yogurt-like and can flow down evenly.

[0058] (4) 3 g of the above coating was applied to the surface of a pretreated tinplate substrate (12 cm × 5 cm, 0.28 mm thick) by glass rod scraping method. After drying and curing at room temperature for 40 h, a brownish-brown laser-visible light compatible composite coating was obtained.

[0059] The coatings formulated using this process system have high stability, and the pigments and fillers in the coatings will not precipitate or clump within 10 months.

[0060] The camouflage coating of this formulation, measured with a UV-3600 UV-VIS-NIR spectrophotometer, showed a near-infrared reflectance of 3.4% at 1.06 μm. Figure 3 ); According to national standard GB 1720-79 (89), the adhesion of the camouflage coating using the QFZII type adhesion tester is grade 1; according to national standard GB 1731-93, the flexibility of the camouflage coating using the QTY-10A type film cylindrical bending tester is 2 mm; and according to national standard GB / T 1732-93, the impact resistance of the camouflage coating using the QCJ type impact strength tester reaches 50 kg·cm. The color characteristics of the camouflage coating conform to the BE0811 brown earth color standard in GJB 795A. The color difference value obtained by comparing the colorimetric value measured by the 3nh-NR10QC colorimeter produced by Sanen Technology Co., Ltd. with the standard color sample is 1.34. Figure 4 ).

[0061] Figure 3 The images show the reflectance spectra of coatings with different mass ratios of graphite and iron oxide yellow pigment, under the condition that other preparation conditions remain unchanged in Example 2. Figure 4 This is the corresponding sample appearance drawing.

[0062] Figure 3 In the above, when the mass ratio of graphite to iron oxide yellow pigment is 1:9, the corresponding... Figure 4 The leftmost image shows the coating appearance when the mass ratio of graphite to iron oxide yellow pigment is 2:8. Figure 4The second image on the left shows the coating appearance when the mass ratio of graphite to iron oxide yellow pigment is 3:7 (Example 1). Figure 4 The third image from the left shows the coating appearance when the mass ratio of graphite to iron oxide yellow pigment is 4:6. Figure 4 The coating appearance diagram on the right (3rd in the right image) shows the corresponding result when the mass ratio of graphite to iron oxide yellow pigment is 5:5. Figure 4 The rightmost image shows the appearance of the pigment. When the mass ratio of graphite to iron oxide yellow pigment is 6:4, the corresponding... Figure 4 The exterior view of the middle right 1; by Figure 3 and Figure 4 It can be seen that the reflectance of the coating to 1.06 μm near-infrared light can be as low as below 8.6% under different graphite and pigment mass ratios, indicating that the coating has outstanding laser stealth effect. With the increase of the graphite and pigment mass ratio, the 1.06 μm near-infrared reflectance generally shows a decreasing trend, indicating that a higher graphite and iron oxide yellow pigment mass ratio can achieve a lower near-infrared reflectance. Furthermore, by changing the graphite and pigment mass ratio, the appearance color of the coating can be controlled within the range of yellow and dark brown, meeting the needs of different color applications.

[0063] Example 3 (1) Weigh waterborne polyurethane resin (PU, solid content 50%) and curing agent (N-210 polyether, liquid, solid content 42.9%) at a mass ratio of 4:1, and mix them evenly to obtain an adhesive; (2) Select 4000 mesh graphite (99% purity), medium chrome yellow pigment (99% purity, 400 mesh particle size) and iron oxide blue pigment (99% purity, 400 mesh particle size) as composite functional pigments and fillers. The mass ratio of medium chrome yellow pigment to iron oxide blue is 2.6:1, and the mass ratio of graphite to pigment (medium chrome yellow pigment and iron oxide blue) is 3:7. Weigh the prepared composite functional pigments and fillers, place them in a planetary high-energy ball mill, add 5% of PEG2000 by mass of the composite functional pigments and fillers, and ball mill at 80 r / min for 1 h to obtain modified pigments and fillers.

[0064] (3) Weigh 60 parts of the binder and 40 parts of the composite functional pigments and fillers according to the mass ratio, put them in a clean plastic cup, and stir them thoroughly with a glass rod until the coating is yogurt-like and can flow down evenly.

[0065] (4) 3 g of the above coating was applied to the surface of a pretreated tinplate substrate (12 cm × 5 cm, 0.28 mm thick) by glass rod scraping method. After drying and curing at room temperature for 40 h, a brownish-brown laser-visible light compatible composite coating was obtained.

[0066] The coatings formulated using this process system have high stability, and the pigments and fillers in the coatings will not precipitate or clump within 10 months.

[0067] The camouflage coating of this formulation, measured with a UV-3600 UV-VIS-NIR spectrophotometer, showed a near-infrared reflectance of 5.7% at 1.06 μm. According to national standard GB 1720-79 (89), the adhesion of the camouflage coating using the QFZII type adhesion tester is grade 1; according to national standard GB 1731-93, the flexibility of the camouflage coating using the QTY-10A type film cylindrical bending tester is 2 mm; and according to national standard GB / T 1732-93, the impact resistance of the camouflage coating using the QCJ type impact strength tester reaches 50 kg·cm. The color characteristics of the camouflage coating conform to the green standard in MG1151 of GJB 795A. The color difference value obtained by comparing the colorimetric value measured by the 3nh-NR10QC colorimeter produced by Sanen Technology Co., Ltd. with the standard color sample is 2.85.

[0068] Figure 5 The images show the reflectance spectra of coatings with different mass ratios of chrome yellow pigment and iron oxide blue pigment, under the condition that other preparation conditions remain unchanged in Example 3. Figure 6 This is the corresponding sample appearance drawing.

[0069] Figure 5 In the case where the mass ratio of chrome yellow pigment to iron oxide blue pigment is 3.4:0.2, the corresponding... Figure 6 The rightmost image shows the coating appearance. When the mass ratio of chrome yellow pigment to iron oxide blue pigment is 3.0:0.6, it corresponds to... Figure 6 The coating appearance diagram in rightmost image 2 shows that when the mass ratio of chrome yellow pigment to iron oxide blue pigment is 2.6:1.0 (Example 3), the corresponding... Figure 6 The coating appearance diagram of the third image from the right shows that when the mass ratio of chrome yellow pigment to iron oxide blue pigment is 2.2:1.4, it corresponds to... Figure 6 The second image from the left shows the coating appearance. When the mass ratio of chrome yellow pigment to iron oxide blue pigment is 1.8:1.8, it corresponds to... Figure 6 The exterior view of the leftmost point; by Figure 5 and Figure 6 It can be seen that the reflectance of the coating to 1.06 μm near-infrared light can be as low as 5.7% under different graphite and pigment mass ratios, indicating that the coating has a prominent laser stealth effect. As the mass ratio of yellow and blue pigments decreases, the 1.06 μm near-infrared reflectance generally shows a decreasing trend, indicating that a lower yellow-blue pigment mass ratio can achieve a lower near-infrared reflectance. Furthermore, by changing the yellow-blue pigment mass ratio, the appearance color of the coating can be controlled within the range of dark green and yellow-green, meeting the needs of different color applications.

[0070] Comparative Example 1 The only difference from Example 1 is that PEG2000 is omitted.

[0071] The pigments and fillers in the coatings prepared by this process system will not precipitate or clump within 6 months.

[0072] The camouflage coating of this formulation, measured with a UV-3600 UV-VIS-NIR spectrophotometer, showed a near-infrared reflectance of 4.5% at 1.06 μm. According to national standard GB 1720-79 (89), the adhesion of the camouflage coating using the QFZII type adhesion tester is grade 1; according to national standard GB 1731-93, the flexibility of the camouflage coating using the QTY-10A type film cylindrical bending tester is 3mm; and according to national standard GB / T 1732-93, the impact resistance of the camouflage coating using the QCJ type impact strength tester reaches 45 kg·cm. The camouflage coating is characterized by its brownish-earth color.

[0073] Comparative Example 2 The only difference from Example 1 is that graphite is replaced with graphene.

[0074] The camouflage coating of this formulation, measured with a UV-3600 UV-VIS-NIR spectrophotometer, showed a near-infrared reflectance of 2.9% at 1.06 μm. According to national standard GB 1720-79 (89), the adhesion of the camouflage coating using the QFZII type adhesion tester is grade 1; according to national standard GB 1731-93, the flexibility of the camouflage coating using the QTY-10A type film cylindrical bending tester is 2 mm; and according to national standard GB / T 1732-93, the impact resistance of the camouflage coating using the QCJ type impact strength tester reaches 50 kg·cm. The camouflage coating is characterized by its brownish-earth color.

[0075] The near-infrared reflectance is similar to that of Example 1; however, the raw material cost is 50 times that of Example 1.

[0076] Comparative Example 3 The only difference from Example 1 is that PEG2000 is added after the pigment and filler ball milling is completed.

[0077] The pigments and fillers in the coatings prepared using this process system will not precipitate or clump within 8 months.

[0078] The camouflage coating of this formulation, measured with a UV-3600 UV-VIS-NIR spectrophotometer, showed a near-infrared reflectance of 3.9% at 1.06 μm. According to national standard GB 1720-79 (89), the adhesion of the camouflage coating using the QFZII type adhesion tester is grade 1; according to national standard GB 1731-93, the flexibility of the camouflage coating using the QTY-10A type film cylindrical bending tester is 2 mm; and according to national standard GB / T 1732-93, the impact resistance of the camouflage coating using the QCJ type impact strength tester reaches 45 kg·cm. The camouflage coating is characterized by its brownish-earth color.

[0079] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A coating composition, characterized in that, The raw materials include the following parts by weight: 15-50 parts of composite functional pigments and fillers and 50-85 parts of binder; The adhesive is composed of a water-based polyurethane resin and a curing agent; the mass ratio of the water-based polyurethane resin to the curing agent is 4:

1. The composite functional pigments and fillers include graphite and pigments and fillers; the mass ratio of graphite to pigments and fillers is 1~6:4~9.

2. The coating composition according to claim 1, characterized in that, It also includes dispersants, which account for 3-5% of the mass of composite functional pigments and fillers.

3. The coating composition according to claim 2, characterized in that, The dispersant is polyethylene glycol; the average molecular weight of the polyethylene glycol is 1800~2000.

4. The coating composition according to claim 1, characterized in that, The pigments and fillers include one or more of chrome yellow, iron oxide yellow, and iron oxide blue; the particle size of the pigments and fillers is 300-500 mesh.

5. The coating composition according to claim 1, characterized in that, The solid content of the waterborne polyurethane resin is 50%.

6. The coating composition according to claim 1, characterized in that, The solid content of the curing agent is 42.9%.

7. The coating composition according to claim 1, characterized in that, The graphite has a particle size of 2000~4000 mesh.

8. A method for preparing the coating composition according to any one of claims 1 to 7, characterized in that, Includes the following steps: A water-based polyurethane resin and a curing agent are mixed in a certain mass ratio to obtain an adhesive; Graphite and pigments are mixed according to a mass ratio, and then a dispersant is added and the mixture is ground to obtain composite functional pigments. The binder and composite functional pigments and fillers are mixed according to the mass fractions to obtain the coating composition.

9. The method for preparing the coating composition according to claim 8, characterized in that, The grinding speed is 80~1200 r / min, and the grinding time is 1~1.5 h.

10. A laser- and visible-light compatible camouflage coating, characterized in that, It is formed by curing the coating composition according to any one of claims 1 to 7.

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