High-infrared-reflection heat-insulation double-layer colored paint layer structure, high-infrared-reflection heat-insulation coating system and application of high-infrared-reflection heat-insulation coating system

Abstract

The invention relates to a high infrared reflection heat insulation double-layer colored paint layer structure which is characterized by comprising a first colored paint layer and a second colored paint layer, the first colored paint layer is an enhanced infrared reflection layer added with flaky reflection pigment, and the second colored paint layer is a black coating with high infrared transmittance. First colored paint used by the first colored paint layer and second colored paint used by the second colored paint layer are mixtures containing acrylic resin and polyurethane resin, the infrared reflectivity of the first colored paint layer is larger than 70%, and the infrared transmittance of the second colored paint layer is larger than 70%; the double-colored-paint-layer structure is matched with the conventional primer layer and the varnish layer, the infrared reflectivity of 70% or above can be achieved, meanwhile, the high weather resistance and the excellent bright black appearance are achieved, the obvious reflection cooling effect is achieved, and the double-colored-paint-layer structure can be widely applied to the fields of aircrafts, automobiles, intelligent equipment and the like. The invention further comprises a high-infrared-reflection heat-insulation coating system and application thereof.

Description

Technical Field

[0001] The present invention relates to the field of infrared reflective heat-insulating coatings, and in particular to a high infrared reflective heat-insulating double-layer paint structure that can be used for a variety of substrates such as carbon fiber composite materials, glass fiber composite materials, and plastics, as well as a high infrared reflective heat-insulating coating system and applications thereof. Background Art

[0002] Black is loved by people because of its high-grade texture. Carbon black, iron oxide, etc. are the most commonly used color pigments for black, but these pigments have a strong absorption effect on sunlight, and the heat generated will cause a significant increase in the temperature of the surface and internal space of the material. In hot summer weather, the surface temperature of a car with a black exterior can even reach 70 degrees Celsius. Excessive temperature will not only cause discomfort to people, but also increase energy consumption and cause rapid aging of the material. Carbon fiber composite material is a high-performance composite material made of carbon fiber and resin through various molding processes, with properties such as low density, high strength, and high stiffness. Carbon fiber composite materials are widely used in aircraft, automobiles, rail transportation, smart devices and other fields, and are currently one of the most popular lightweight materials. Carbon fiber surface coating has unique characteristics, such as complex and time-consuming procedures, defects caused by fiber composites, requirements for low-temperature coating and high environmental protection requirements, and applications in emerging high-end fields, which require higher quality surfaces for coatings.

[0003] In the prior art, the main mechanism for achieving heat insulation is to reduce the accumulated heat in the material through high reflection of sunlight. For example, heat-insulating skylights often use magnetron sputtering technology to deposit nano-metal layers to reflect ultraviolet and near-infrared light in the sunlight band; reflective heat-insulating films use nano-coating technology to prepare multi-layer nano-layers with staggered refractive indices to reflect near-infrared light. However, the above technical methods are difficult to apply in coatings, and the use of reflective pigments often requires thicker coatings and poor appearance. Patent US20040191540A1 describes a double-coating system in which a black pyrene black pigment that is transparent to infrared is coated on a reflective metal substrate to achieve an infrared reflection performance of about 30-50%, thereby reducing the temperature of the sample. Patent WO2010030970A3 describes a water-based two-coat system based on acrylic emulsion and sheet silicate, which uses titanium dioxide, aluminum pigment or a mixture of them with metal oxides as the reflective first layer and pyrene black pigment as the second layer, which can achieve a temperature reduction of about 7 degrees Celsius, but does not disclose its other technical features such as reflectivity and color. Patent WO2011056564A3 describes a coating of mixed infrared reflective pigments and infrared transparent pigments, the purpose of which is to match the color of the improved coating, but the reflectivity is low on a black substrate.

[0004] In summary, the art urgently needs to develop a double-layer paint structure with high infrared reflection and heat insulation to solve the problems existing in the prior art. Summary of the invention

[0005] Based on the above facts, the purpose of the present invention is to provide a double-layer paint layer structure with high infrared reflection and heat insulation, wherein the first paint layer has an infrared reflectivity greater than 70%, and the second paint layer has an infrared transmittance greater than 70%; the double-layer paint layer structure is matched with a conventional primer layer and a clear coat layer, which can achieve an infrared reflectivity of more than 70% while having strong weather resistance and an excellent bright black appearance, and has a significant reflective cooling effect.

[0006] The first aspect of the present invention provides a double-layer paint layer structure with high infrared reflection and heat insulation, including a first paint layer and a second paint layer, the first paint layer is an enhanced infrared reflection layer added with flaky reflective pigments, and the second paint layer is a coating with high infrared transmittance and a black appearance, and the first paint used in the first paint layer and the second paint used in the second paint layer are both a mixture of acrylic resin and polyurethane resin.

[0007] First color paint

[0008] In some embodiments of the present invention, the first color paint comprises, by weight percentage:

[0009]

[0010] The total content of the above components is 100%.

[0011] The preparation steps of the first color paint include: opening a stirring kettle, adding a solvent, an acrylic resin, a polyurethane resin, an infrared reflective color paste, an infrared transparent color paste, a wetting and leveling agent, a defoaming agent, and a thickener into the stirring kettle in sequence, and stirring until fully mixed; adjusting the pH to 7.5-8.5 with a pH adjuster to obtain the first color paint.

[0012] Second color paint

[0013] In some embodiments of the present invention, the second color paint comprises, by weight percentage:

[0014]

[0015] The total content of the above components is 100%.

[0016] The preparation steps of the second color paint include: opening a stirring kettle, adding a solvent, an acrylic resin, a polyurethane resin, an infrared transparent color paste, a wetting and leveling agent, a defoaming agent, and a thickener into the stirring kettle in sequence, and stirring until fully mixed; adjusting the pH to 7.5-8.5 with a pH adjuster to obtain the second color paint.

[0017] Acrylic resin

[0018] In the present invention, the acrylic resin contained in the first color paint and the second color paint is selected from water-based acrylic emulsion, polyester-modified acrylic emulsion or polyurethane-modified acrylic emulsion. Preferably, the acrylic resin has a hydroxyl content of 0-3%, a solid content of 20-50%, a glass transition temperature (Tg)>25°C, a minimum film forming temperature (MFTT)>25°C, is substantially transparent in the near-infrared range of 780nm-2500nm, has substantially no effect on infrared reflectivity or transmittance, and does not require the addition of a curing agent.

[0019] Specifically, the acrylic resin is selected from one or more of the acrylic resins including SETAQUA@6801 and SETAQUA@6802 provided by Allnex Resins, Bayhydrol@A2846, Bayhydrol@A2474, Bayhydrol@A2457, Bayhydrol@A2856xp and Bayhydrol@A2469 provided by Covestro Resins, WD-594 and WD-588 provided by DIC Resins, and Joncryl@8330AP, Joncryl@8111AP, Joncryl@HYB 6336, Joncryl@HYB 6340 and Joncryl@HYB 6345AP provided by BASF Resins.

[0020] Polyurethane resin

[0021] In the present invention, the polyurethane resin in the first color paint and the second color paint is selected from waterborne polyurethane dispersion, acrylic modified polyurethane dispersion, aliphatic modified polyurethane dispersion, polyester modified polyurethane dispersion. Preferably, the polyurethane resin does not contain hydroxyl, has a solid content of 20-50%, a glass transition temperature (Tg) <0°C, a minimum film forming temperature (MFTT) <5°C, is substantially transparent in the near infrared range of 780nm-2500nm, has substantially no effect on infrared reflectivity or transmittance, and does not require the addition of a curing agent.

[0022] Specifically, the polyurethane resin is selected from one or more of the polyurethane resins of Joncryl@U 4190, Joncryl@U5168, and Joncryl@U 4199AP provided by BASF, WATERSOL UD-5002 and WATERSOL UD-8801 provided by DIC Resins, Bayhydrol@UH2648, Bayhydrol@UH2648 / 1, Bayhydrol@UH2606, Bayhydrol@UH2952, and Bayhydrol@UA2856 provided by Covestro, and DAOTAN VTW6460, DAOTAN VTW6462, and DAOTAN VTW6464 provided by Allnex Resins.

[0023] Infrared reflective color paste

[0024] In the present invention, the infrared reflective color paste is a pigment color paste with reflective properties in the range of 780nm-2500nm, which is selected from one of aluminum silver paste dispersion, black pigment dispersion or white pigment dispersion. Preferably, the infrared reflective color paste is aluminum silver paste dispersion, and the infrared reflective color paste is 200 nm-1000 nm in weight.

[0025] The aluminum silver paste dispersion comprises:

[0026] 5-15 parts of deionized water

[0027] Dispersant 0.1-1 part

[0028] 2-7 parts of aluminum paste

[0029] The preparation step of the aluminum-silver paste dispersion comprises: mixing deionized water, a dispersant, and the aluminum-silver paste and stirring evenly, and placing for 1.5-3 hours for standby use, thereby obtaining the aluminum-silver paste dispersion;

[0030] The black pigment dispersion or the white pigment dispersion comprises:

[0031]

[0032] The preparation steps of the black pigment dispersion or the white pigment dispersion include: mixing deionized water, a dispersant, and a black or white pigment evenly, adjusting the pH to 7.5-8.5 with a pH adjuster, and then sand-milling for 1-2 hours until the fineness is less than 10 μm, thereby obtaining a black pigment dispersion or a white pigment dispersion;

[0033] Preferably, the aluminum paste is a flaky aluminum pigment coated with resin or silicon oxide, the black pigment is a black reflective pigment with infrared reflection effect, and the white pigment is titanium dioxide with infrared reflection effect; more preferably, the aluminum paste is a water-based aluminum pigment coated with silica, which is a silver dollar type or irregular flaky structure, with a particle size of 5-50μm and a thickness of 30-500nm.

[0034] Specifically, the titanium dioxide is selected from one or more of the titanium dioxides of Altiris 800 and Altiris 550 provided by Panentuo Company and TIPAQUE PFR404 provided by Ishihara Company; the black pigment is selected from one or more of the black pigments of BLACK 30C941, BLACK 10P950, BLACK 10G996, BLACK 10C909 provided by Schett Company and SG-101 provided by Ishihara Company; the aluminum silver paste is selected from STAPAHYDROLAN series 2153, 2154, 2156, 2197, S408, S422 provided by Aika Company, HYDROSHINE WS series 3001, 3004, METALURE series 1006, SBC AQ provided by Star Platinum Company One or more of the J series 6713, 6718, 6812, 6834 aluminum silver pastes; the dispersant is selected from one or more of the dispersants of models 190, 192, 180, 2012, 2014 provided by BYK and Dispex series ULTRAPX 4550, 4522, 4525, 4575 provided by BASF.

[0035] Infrared transparent color paste

[0036] In the present invention, the infrared transparent color paste includes one or more dispersions of different colors, and the dispersions include, by weight:

[0037]

[0038] The preparation steps of the dispersion include: mixing deionized water, dispersant, dispersing resin and pigment for 20-40 minutes, adjusting the pH to 7.5-8.5 with a pH adjuster, and then sanding for 1-3 hours until the fineness is less than 10 μm, so as to obtain the dispersion for infrared transparent color paste. It should be noted that the dispersion here is actually also a color paste, but in order to distinguish it from the infrared transparent color paste and avoid confusion, it is called a dispersion.

[0039] The pigment is selected from one or more of various pigments such as red pigments, yellow pigments, blue pigments, black pigments, etc., including but not limited to indanthrone, copper phthalocyanine blue pigments, YInMn indium manganese blue, perylene black pigments, perylene red pigments, non-hiding DPP red pigments, quinacridone red pigments, quinophthalone pigments, isoindolinone pigments and benzimidazolone based yellow-orange pigments.

[0040] Specifically, the red pigment is selected from one or more of the red pigments of the models Paliogen@RedL3850, Paliogen@Red L3875, Paliogen@Red L3885, and Paliogen@Red L4045 provided by BASF of Germany; the yellow pigment is selected from one or more of the yellow pigments of the models Paliotol@Yellow L0962, Paliotol@Yellow L0960, Paliotol@Yellow L1155, Sicopal@Yellow L1130, Sicopal@Yellow L1100, and Sicopal@Yellow L1635 provided by BASF of Germany; the blue pigment is selected from one or more of the blue pigments of the models Heliogen@Blue L7085, Heliogen@Blue L6975, Heliogen@BlueL6930 and Heliogen@Blue L7081 provided by BASF of Germany; the black pigment is selected from one or more of the blue pigments of the models Paliogen@Black L7085, ... The dispersion resin is selected from SETAL@6303 resin of Allnex, Joncryl@62J of BASF, ACW-1011 of Nippon Paint, preferably SETAL@6303 resin of Allnex.

[0041] In a specific embodiment, the infrared transparent color paste in the first color paint can be a dispersion of one color; it can also be a mixture of dispersions of multiple different colors; it can also be a mixture of dispersions of multiple different colors and a small amount of black pigment dispersion, and the black pigment dispersion can be the black pigment dispersion for preparing the infrared reflective color paste as described above, and the addition amount of the black pigment dispersion is 1-6wt%, preferably 1-2wt%; the infrared transparent color paste in the second color paint is a black infrared transparent color paste, which can be a black dispersion, or a black infrared transparent color paste mixed with dispersions of multiple different colors, or it can be a mixture of dispersions of multiple different colors and a small amount of black pigment dispersion, and the black pigment dispersion can be the black pigment dispersion for preparing the infrared reflective color paste as described above, and the addition amount of the black pigment dispersion is 1-6wt%, preferably 1-2wt%.

[0042] Wetting and leveling agent

[0043] In some embodiments of the present invention, the wetting and leveling agent is selected from one or more of the wetting and leveling agents of models 347, 349, 3451, 381, 3560, and 3455 provided by BYK and the hydropalat@WE series 3179, 3189, 3220, 3225, and 3229 provided by BASF.

[0044] Defoaming agent

[0045] In some embodiments of the present invention, the defoaming agent is selected from one or more of the defoaming agents of models 011, 024, 015, 028, 1710 provided by BYK, and SI2281, SI2210, and SI2299 of the Foamaster series provided by BASF.

[0046] Thickener

[0047] In some embodiments of the present invention, the thickener is selected from one or more of the thickeners of AQUATIX 8421, LAPONITE-RD, RHEOBYK-440, RHEOBYK-7420 provided by BYK, and Rheovis series HS1212, HS1303, AS1130, AS1189, PU1235, and PU1250 provided by BASF. Among them, LAPONITE-RD is pre-dispersed into an aqueous solution for use, specifically, for example, LAPONITE-RD is pre-dispersed into a 3% aqueous solution for use.

[0048] pH Adjusters

[0049] In some embodiments of the present invention, the pH regulator is a dimethylethanolamine aqueous solution (DMEA). Specifically, for example, a 10% dimethylethanolamine aqueous solution is selected as the pH regulator.

[0050] Solvents

[0051] In some embodiments of the present invention, the solvent includes deionized water and a film-forming solvent whose addition amount is not higher than 10%, and the mass percentage of the film-forming solvent can be, for example, 0-5%, 5-10%. The film-forming solvent is selected from one or more of isooctyl alcohol, isopropanol, propylene glycol, propylene glycol butyl ether, dipropylene glycol butyl ether, ethylene glycol butyl ether, diethylene glycol butyl ether, propylene glycol methyl ether, dipropylene glycol methyl ether, propylene glycol methyl ether acetate, ethylene glycol ethyl ether, diethylene glycol ethyl ether, and alcohol ester twelve.

[0052] The second aspect of the present invention provides a high infrared reflective thermal insulation coating system, comprising a varnish layer, a second color paint layer, a first color paint layer and a primer layer; the varnish used in the varnish layer is an isocyanate-cured hydroxy acrylic resin composition; the primer used in the primer layer is a high-solid isocyanate-cured polyamine resin two-component coating composition; the first color paint layer is an enhanced infrared reflective layer added with flaky reflective pigments, and the second color paint layer is a coating with high infrared transmittance and a black appearance, and the first color paint used in the first color paint layer and the second color paint used in the second color paint layer are both a mixture of acrylic resin and polyurethane resin.

[0053] Varnish

[0054] In the present invention, the viscosity of the varnish is in the range of 100-5000 mPa·s, and the varnish is preferably Nippon varnish C7900 provided by Nippon Paint Corporation.

[0055] Primer

[0056] In the present invention, the solid content of the primer is greater than 70%, and the viscosity ranges from 100 to 20000 mPa·s; preferably, the primer is Nippon paint P7001 provided by Nippon Paint Corporation.

[0057] According to a preferred embodiment of the present invention, the preparation steps of the high infrared reflection thermal insulation coating system include:

[0058] (1) Preparation of the first color paint:

[0059] Open the stirring kettle, add the solvent, acrylic resin, polyurethane resin, infrared reflective color paste, infrared transparent color paste, wetting and leveling agent, defoaming agent, and thickener into the stirring kettle in sequence, and stir until fully mixed; adjust the pH to 7.5-8.5 with a pH adjuster to obtain the first color paint;

[0060] (2) Preparation of the second color paint:

[0061] Open the stirring kettle, add the solvent, acrylic resin, polyurethane resin, infrared transparent color paste, wetting and leveling agent, defoaming agent, and thickener into the stirring kettle in sequence, and stir until fully mixed; adjust the pH to 7.5-8.5 with a pH adjuster to obtain the second color paint;

[0062] (3) spraying a first color paint on the surface of the primer layer (4), flash-drying at 60-80°C for 5-10 minutes, and obtaining a first color paint layer (3); continuing to spray a second color paint on the surface of the first color paint layer (3), drying at 60-80°C for 10-30 minutes, and obtaining a second color paint layer (2); spraying a clear coat layer (1) on the surface of the second color paint layer (2), and curing at 60-100°C for 30-120 minutes, and obtaining the high infrared reflective heat-insulating coating system.

[0063] The third aspect of the present invention provides applications of the high infrared reflective thermal insulation coating system described in the second aspect of the present invention, including applications in aircraft, automobiles, smart devices and other fields.

[0064] Beneficial Effects of the Invention

[0065] The present invention provides a double-layer color paint layer structure with high infrared reflection and heat insulation, wherein the first color paint layer has an infrared reflectivity greater than 70%, and the second color paint layer has an infrared transmittance greater than 70%; the double-layer color paint layer structure is matched with a conventional primer layer and a clear coat layer, and can have strong weather resistance and an excellent bright black appearance while achieving an infrared reflectivity of more than 70%, and has a significant reflection and cooling effect, and can be widely used in aircraft, automobiles, smart devices and other fields. The high infrared reflection and heat insulation coating system formed by the double-layer color paint layer structure with high infrared reflection and heat insulation can be used for a variety of substrates such as carbon fiber composite materials, glass fiber composite materials, and plastics, and is particularly suitable for carbon fiber composite materials, has excellent adhesion and environmental protection effects, and the spraying process is simple and can be completed under low temperature conditions (≦80°C), saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 This is a schematic diagram of the double-layer color paint structure with high infrared reflection and heat insulation according to the present invention.

[0067] Figure 2 This is a schematic diagram of the structure of the high infrared reflective heat-insulating coating system of the present invention coated on a substrate.

[0068] The numbers in the figure represent: 1. varnish layer; 2. second color paint layer; 3. first color paint layer; 4. primer layer; 5. substrate. DETAILED DESCRIPTION

[0069] In order to more clearly illustrate the present invention, the present invention is further described below in conjunction with specific examples and comparative examples. It should be understood by those skilled in the art that the content specifically described below is illustrative rather than restrictive, and should not be used to limit the scope of protection of the present invention. The experimental methods used in the following examples and comparative examples are conventional methods unless otherwise specified, and the raw materials and reagents used are products that can be purchased from conventional commercial channels unless otherwise specified.

[0070] The above technical solution is described below in conjunction with specific embodiments.

[0071] Preparation of infrared reflective color paste

[0072] Aluminum paste dispersion: STAPA HYDROLAN S408, HYDROSHINE WS 3001, METALURE 1006, and SBC AQ J6713 aluminum pastes were selected respectively, 10 parts of deionized water, 0.5 parts of BYK192, and 5 parts of aluminum pastes were stirred and mixed at a low speed, and allowed to stand for 2 hours to be used, to prepare STAPA HYDROLAN S408 dispersion, HYDROSHINE WS 3001 dispersion, METALURE 1006 dispersion, and SBC AQ J6713 dispersion, respectively.

[0073] Black pigment dispersion or white pigment dispersion: 30 parts of deionized water, 9 parts of BYK190, 1 part of 10% DMEA solution, and 60 parts of black or white pigment are mixed and stirred for 30 minutes, and the pH is adjusted to 7.5-8.5 with a pH adjuster, and then sand-milled for 1-2 hours until the fineness is less than 10μm. The black pigment selected is BLACK 30C941, and BLACK 30C941 dispersion is prepared. The white pigments selected are Altiris 800 and TIPAQUE PFR404, and Altiris 800 dispersion and TIPAQUE PFR404 dispersion are prepared respectively.

[0074] Preparation of the first color paint without infrared transparent color paste

[0075] The first color paint samples 1-10 without infrared transparent color paste were prepared according to Table 1 below.

[0076] Table 1 Sample 1-10 formula

[0077]

[0078]

[0079] Determine the reflectivity and transmittance of the first paint samples 1-10 without infrared transparent color paste:

[0080] Preparation of reflectivity sample: prepare a carbon fiber composite substrate of 15*10cm, wipe the surface of the substrate clean with isopropyl alcohol, spray 50μm thick P7001 primer, bake at 80℃ for 50min, then spray the first color paint composition of samples 1-10 with a thickness of 15μm and bake at 80℃ for 20min.

[0081] Preparation of transmittance sample: prepare a transparent glass substrate of 15*10 cm, wipe the surface of the substrate clean with ethanol, directly spray the above sample 1-10 paint composition (diluted with 25% deionized water) with a thickness of 15 μm, and bake at 80°C for 20 minutes.

[0082] After the sample was prepared, the UV-visible-near infrared reflectivity and transmittance were tested on a HITACHI U-4100 spectrometer. The hiding power was measured using the black and white grid paper method. The results are summarized in Table 2.

[0083] Table 2 Test results of samples 1-10

[0084]

[0085] From the test results in Table 2 above, it can be seen that the samples using aluminum silver dispersion as infrared reflective color paste on carbon fiber substrates show good infrared reflectivity, with the highest exceeding 80%. The samples using titanium dioxide pigment dispersion or black pigment dispersion as infrared reflective color paste show certain infrared reflectivity, but the hiding power is limited, especially for the near-infrared range. Although the hiding power can be enhanced by increasing the coating thickness, the application of too thick coating is limited, the spraying process is complicated and the cost is increased.

[0086] Preparation of Dispersions for Infrared Black Transparent Colorants

[0087] 69 parts of deionized water, 10 parts of BYK190, 1 part of 10% DMEA solution, 5 parts of SETAL@6303 resin (Zhanxin Company), and 15 parts of pigment were mixed and stirred for 30 minutes, the pH was adjusted to 7.5-8.5 with a pH regulator, and then sand-milled for 1-3 hours until the fineness was less than 10 μm to prepare each dispersion. The pigments used in each dispersion were Paliogen@Red L3850, Paliogen@Red L3875, Paliotol@Yellow L0962, Paliotol@Yellow L0960, Heliogen@Blue L7085, Heliogen@BlueL6975, and Paliogen@Black L0086, respectively, to prepare Paliogen@Red L3850 dispersion, Paliogen@RedL3875 dispersion, Paliotol@Yellow L0962 dispersion, Paliotol@Yellow L0960 dispersion, and Heliogen@Blue L7085 dispersion, Heliogen@Blue L6975 dispersion, Paliogen@Black L0086 dispersion.

[0088] Preparation of infrared black transparent color paste

[0089] Infrared black transparent color paste (BC for short) is prepared by mixing according to the formula in Table 3 below.

[0090] Table 3 BC-1-6 formula

[0091]

[0092] Preparation of the second color paint

[0093] The second color paint samples 11-18 were prepared according to Table 4 below.

[0094] Table 4 Sample 11-18 formula

[0095]

[0096]

[0097] It should be noted that AR 2000BLACK color paste is a black paste containing carbon black pigment, not an infrared transparent color paste, which is not within the scope of protection of the present invention and is used as a control group in the examples.

[0098] Performance determination of the second color paint:

[0099] Sample preparation: prepare a transparent glass substrate of 15*10cm, wipe the surface of the substrate clean with ethanol, directly spray the above sample 11-18 paint composition with a thickness of 15μm, and bake at 80℃ for 20min.

[0100] After the sample was prepared, the UV-visible-near infrared transmittance was tested on a HITACHI U-4100 spectrometer. The hiding power was measured using the black and white grid paper method. The optical indexes were tested using a Xrite-ci7800 colorimeter. The results are summarized in Table 5.

[0101] Table 5 Test results of samples 11-18

[0102]

[0103]

[0104] From the test results in Table 5 above, we can see that the samples using carbon black have almost no infrared transmittance and strong absorption; the samples using Paliogen@Black L0086 single-component dispersion also have good black appearance and infrared transmittance, but its price is too expensive, which will bring obvious cost increase; the samples using infrared black transparent color paste mixed with multiple dispersions have excellent black appearance, and the samples added with black Paliogen@Black L0086 dispersion or BLACK 30C941 dispersion have a deeper black color and rich black tone when observed from multiple angles. However, BLACK 30C941 has a high infrared absorption rate, and adding more may reduce the transmittance.

[0105] Preparation of the first color paint containing infrared transparent color paste

[0106] The first color paint samples 19-27 containing infrared transparent color paste were prepared according to Table 6 below.

[0107] Table 6: Formula of Samples 19-27

[0108]

[0109]

[0110] The test results of samples 19-27 are shown in Table 7 below.

[0111] Table 7 Test results of samples 19-27

[0112] Near infrared reflectivity (780-2500nm)% Sample 19 78 Sample 20 82 Sample 21 80 Sample 22 81 Sample 23 80 Sample 24 79 Sample 25 82 Sample 26 80 Sample 27 12

[0113] From the data in Table 7, it can be seen that adding infrared transparent color paste (mixed or single component) will not affect the reflectivity of the reflective layer, while adding black paste containing carbon black pigment will significantly reduce the reflectivity.

[0114] Preparation of coating samples of Examples 1-15 and Comparative Example 1

[0115] Based on the above samples 1-27, reflective coating samples were prepared, the method is shown in Table 8, and the formula is shown in Table 9. After the samples were prepared and placed for 48 hours, various tests were performed. The infrared irradiation heating test used Phillips Infrared Lamp (100W) for irradiation, the constant temperature laboratory was 25°C, and the distance was 20cm. The test results are shown in Tables 10 and 11.

[0116] Table 8 Preparation method

[0117]

[0118] Table 9 Formula of Examples 1-15 and Comparative Example 1

[0119]

[0120] Table 10 Test results of Examples 1-7 and Comparative Example 1

[0121]

[0122]

[0123] As can be seen from Table 10, Examples 1-7 and Comparative Example 1 reflect the effect of using different types of pigments in the first paint and the second paint on the results. It can be seen that the carbon fiber substrate itself and the coating added with sample 11 (containing carbon black pigment) have strong heat absorption capabilities. Examples 1-7 show that the effect of reflective cooling is positively correlated with the infrared reflectivity.

[0124] Table 11 Test results of Examples 8-15

[0125]

[0126] It can be seen from Table 11 above that adding colored pigments (especially black pigments) to the first color paint or the second color paint will not affect the infrared reflectivity, but can deepen the black appearance to a certain extent.

[0127] The above-mentioned examples and comparative examples were selected to further test the coating performance. The results are shown in Table 12, which shows that the coating of the present invention has excellent weather resistance.

[0128] Table 12 Coating performance test results

[0129]

[0130]

[0131] Furthermore, the above-mentioned embodiment and comparative example samples were placed outdoors under sunlight for irradiation testing. The outdoor temperature was 20°C, the wind speed was about 6m / s, and the placement height was about 2m. An infrared temperature gun was used to vertically test the coating surface at a distance of 2cm. The results are shown in Table 13.

[0132] Table 13 Cooling capacity test results

[0133] Surface temperature after 30 minutes of sunlight exposure Carbon fiber substrate 58 Comparative Example 1 62 Example 2 47 Example 10 50 Example 13 48

[0134] It can be seen from Table 13 above that the sample prepared by the present invention has obvious cooling ability.

[0135] In summary, the high infrared reflective heat-insulating coating system of the present invention can achieve an infrared reflectivity of more than 70% while having strong weather resistance and an excellent bright black appearance, and can achieve a significant reflective cooling effect.

[0136] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A double-layer paint structure with high infrared reflection and heat insulation, characterized in that: The invention comprises a first color paint layer (3) and a second color paint layer (2), wherein the first color paint layer (3) is an enhanced infrared reflection layer to which flake reflective pigments are added, and the second color paint layer (2) is a coating with a black appearance and high infrared transmittance, and the first color paint used in the first color paint layer (3) and the second color paint used in the second color paint layer (2) are both a mixture of acrylic resin and polyurethane resin.

2. The double-layer color paint structure with high infrared reflection and heat insulation according to claim 1 is characterized in that: Measured by mass percentage, the first color paint comprises: The total content of the above components is 100%.

3. The double-layer color paint structure with high infrared reflection and heat insulation according to claim 1 is characterized in that: Measured by mass percentage, the second color paint comprises: The total content of the above components is 100%.

4. The double-layer color paint structure with high infrared reflection and heat insulation according to claim 2 or 3, characterized in that: The acrylic resin is selected from aqueous acrylic emulsion, polyester modified acrylic emulsion or polyurethane modified acrylic emulsion. Preferably, the acrylic resin has a hydroxyl content of 0-3%, a solid content of 20-50%, a glass transition temperature (Tg)>25°C, and a minimum film forming temperature (MFTT)>25°C; the polyurethane resin is selected from aqueous polyurethane dispersion, acrylic modified polyurethane dispersion, aliphatic modified polyurethane dispersion, polyester modified polyurethane dispersion. Preferably, the polyurethane resin does not contain hydroxyl, has a solid content of 20-50%, a glass transition temperature (Tg)<0°C, and a minimum film forming temperature (MFTT)<5°C; the solvent includes deionized water and a film-forming solvent added in an amount not higher than 10%, and the film-forming solvent is selected from one or more of isooctyl alcohol, isopropanol, propylene glycol, propylene glycol butyl ether, dipropylene glycol butyl ether, ethylene glycol butyl ether, diethylene glycol butyl ether, propylene glycol methyl ether, dipropylene glycol methyl ether, propylene glycol methyl ether acetate, ethylene glycol ethyl ether, diethylene glycol ethyl ether, and alcohol ester twelve.

5. The double-layer color paint structure with high infrared reflection and heat insulation according to claim 2 or 3, characterized in that: The infrared transparent color paste comprises one or more dispersions of different colors, and the dispersions comprise: 60-70 parts of deionized water Dispersant 5-15 parts Dispersed resin 2-7 parts Pigment 10-20 parts pH regulator 0.5-5 parts The pigment is selected from one or more of red pigments, yellow pigments, blue pigments, and black pigments, including but not limited to a combination of one or more of indanthrone, copper phthalocyanine blue pigments, YInMn indium manganese blue, perylene black pigments, perylene red pigments, non-hiding DPP red pigments, quinacridone red pigments, quinophthalone pigments, isoindole yellow pigments, and benzimidazolone yellow-orange pigments.

6. The double-layer color paint structure with high infrared reflection and heat insulation according to claim 2 is characterized in that: The infrared reflective color paste is selected from one of aluminum silver paste dispersion, black pigment dispersion or white pigment dispersion, and is calculated by weight. The aluminum silver paste dispersion comprises: 5-15 parts of deionized water Dispersant 0.1-1 part 2-7 parts of aluminum paste The preparation step of the aluminum-silver paste dispersion comprises: mixing deionized water, a dispersant, and the aluminum-silver paste and stirring evenly, and placing for 1.5-3 hours for standby use, thereby obtaining the aluminum-silver paste dispersion; The black pigment dispersion or the white pigment dispersion comprises: The preparation steps of the black pigment dispersion or the white pigment dispersion include: mixing deionized water, a dispersant, and a black or white pigment evenly, adjusting the pH to 7.5-8.5 with a pH adjuster, and then sand-milling for 1-2 hours until the fineness is less than 10 μm, thereby obtaining a black pigment dispersion or a white pigment dispersion; Preferably, the aluminum paste is a flaky aluminum pigment coated with resin or silicon oxide, the black pigment is a black reflective pigment with infrared reflection effect, and the white pigment is titanium dioxide with infrared reflection effect; more preferably, the aluminum paste is a water-based aluminum pigment coated with silica, which is a silver dollar type or irregular flaky structure, with a particle size of 5-50μm and a thickness of 30-500nm.

7. A high infrared reflection heat insulation coating system, characterized in that: The invention comprises a varnish layer (1), a second color paint layer (2), a first color paint layer (3) and a primer layer (4); the varnish used in the varnish layer (1) is an isocyanate-cured hydroxy acrylic resin composition; the primer used in the primer layer (4) is a high-solid isocyanate-cured polyamine resin two-component coating composition; the first color paint layer (3) is an enhanced infrared reflection layer added with flaky reflective pigments, the second color paint layer (2) is a coating with a black appearance and high infrared transmittance, and the first color paint used in the first color paint layer (3) and the second color paint used in the second color paint layer (2) are both a mixture of acrylic resin and polyurethane resin.

8. The high infrared reflection heat insulation coating system according to claim 7, characterized in that: The varnish has a viscosity range of 100-5000 mPa·s, the primer has a solid content of greater than 70%, and a viscosity range of 100-20000 mPa·s; preferably, the varnish is selected from Nippon paint varnish model C7900 provided by Nippon Paint Corporation, and the primer is selected from Nippon paint primer model P7001 provided by Nippon Paint Corporation.

9. The high infrared reflection heat insulation coating system according to claim 7, characterized in that: The preparation steps of the high infrared reflection heat insulation coating system include: (1) Preparation of the first color paint: Open the stirring kettle, add the solvent, acrylic resin, polyurethane resin, infrared reflective color paste, infrared transparent color paste, wetting and leveling agent, defoaming agent, and thickener into the stirring kettle in sequence, and stir until fully mixed; adjust the pH to 7.5-8.5 with a pH adjuster to obtain the first color paint; (2) Preparation of the second color paint: Open the stirring kettle, add the solvent, acrylic resin, polyurethane resin, infrared transparent color paste, wetting and leveling agent, defoaming agent, and thickener into the stirring kettle in sequence, and stir until fully mixed; adjust the pH to 7.5-8.5 with a pH adjuster to obtain the second color paint; (3) spraying a first color paint on the surface of the primer layer (4), flash-drying at 60-80°C for 5-10 minutes, and obtaining a first color paint layer (3); continuing to spray a second color paint on the surface of the first color paint layer (3), drying at 60-80°C for 10-30 minutes, and obtaining a second color paint layer (2); spraying a clear coat layer (1) on the surface of the second color paint layer (2), and curing at 60-100°C for 30-120 minutes, and obtaining the high infrared reflective heat-insulating coating system.

10. An application of the high infrared reflective thermal insulation coating system as claimed in any one of claims 7 to 9, including applications in the fields of aircraft, automobiles, and smart devices.

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