Infrared light transmitting black aqueous color paste, infrared light transmitting black oily color paste, and paint coating and composite paint layer comprising the same

Abstract

The application discloses infrared light transmission black water-based color paste, infrared light transmission black oil-based color paste and composite paint and composite paint layer containing the same. In the application, the infrared light transmission black water-based color paste and the infrared light transmission black oil-based color paste prepared by using Spectrasense Black EH 8082 of titanium anodization as a raw material component can avoid the color phase deviation phenomenon in the automobile paint color matching process, thereby meeting the rich demand of customers on automobile colors. Specifically, in the titanium white dilution color matching, the a* value is close to 0 and the total change is less than 1.0 in the change process from 1 / 3 color depth to 1 / 25 color depth, and in the aluminum dilution color matching, the C* value is less than 1.0 when the L* value is adjusted from 25-75. In addition, the application further discloses a composite paint layer, and through the collocation design of the coating formula and the double paint layer, the solar radiation reflectivity of the surface of the automobile body can be further improved, the absorption of sunlight by the automobile body is reduced, and thus the temperature of the automobile body and the cabin is reduced.

Description

Technical Field

[0001] This invention relates to the field of coatings. More specifically, it relates to infrared-transmitting black water-based pigment paste, infrared-transmitting black oil-based pigment paste, and colored paint coatings and composite colored paint layers containing the same. Background Technology

[0002] With global warming and increasing car ownership, thermal management of passenger vehicle cabins has become increasingly important. Cars parked in high-temperature environments, especially those exposed to sunlight, tend to accumulate excessive heat inside the body and cabin, leading to passenger discomfort and reduced fatigue resistance of vehicle equipment. Furthermore, the widespread use of in-vehicle air conditioning to lower interior temperatures results in higher energy consumption and carbon dioxide emissions. With growing environmental awareness and increasing demands for passenger comfort, optimizing vehicle energy efficiency has become a crucial issue in automotive design, leading to the development of various automotive coating technologies to improve the heat dissipation efficiency and thermal protection capabilities of the body and cabin.

[0003] One way to address the aforementioned issue is by applying heat-insulating coatings to the interior of the car cabin. These coatings are typically new, high-efficiency materials specifically designed to reduce heat transfer and improve cabin thermal management. By forming a low-thermal-conductivity protective layer on the cabin's interior surface, these coatings effectively reduce the transfer of external heat into the vehicle, thereby lowering the cabin temperature. Aerogel heat-insulating coatings are an advanced technology in this field. Aerogel materials possess extremely low thermal conductivity and high porosity; their unique nanoporous structure effectively blocks heat conduction, convection, and radiation. Compared to traditional heat-insulating materials, aerogel coatings not only offer superior heat insulation performance but also boast advantages such as lightweight and thin-layer application, significantly reducing cabin temperature and improving passenger comfort while maintaining interior space.

[0004] Another approach is to apply an infrared-reflective coating to the exterior of the car body, forming an infrared-reflective coating. For example, patent CN 102712821 B mentions using a double-layer design to improve the infrared reflectivity of the darker coating, thereby improving the heat dissipation efficiency of the car body or cabin. However, with the continuous development of the automotive industry, consumers have placed higher demands on car body coatings. These demands are not limited to functional improvements but also include aesthetics and durability. Research has found that the perylene black pigment PB 32 used in the aforementioned patent... The color paste made with Black L 0086 exhibits hue deviation due to dilution during automotive color design and tinting, failing to meet the diverse needs of automotive color design. Therefore, there is an urgent need for a paint formulation suitable for automotive industry tinting applications that can not only meet the rich demands of automotive color design but also reduce the temperature of the vehicle body (including plastic parts) and interior. Summary of the Invention

[0005] Based on this, the first objective of the present invention is to provide an infrared light transmission black water-based pigment.

[0006] The second objective of this invention is to provide a method for preparing the infrared light transmission black aqueous pigment paste as described above.

[0007] The third objective of this invention is to provide an infrared light-transmitting black water-based paint coating.

[0008] The fourth objective of this invention is to provide an infrared-transmitting black oily pigment.

[0009] The fifth objective of this invention is to provide a method for preparing the infrared light transmission black oily pigment paste as described above.

[0010] The sixth objective of this invention is to provide an infrared light-transmitting black oil-based paint coating.

[0011] The seventh objective of this invention is to provide a composite paint layer.

[0012] To achieve the first objective mentioned above, the present invention adopts the following technical solution:

[0013] This invention discloses an infrared light transmission black aqueous pigment, which, by mass percentage, comprises:

[0014]

[0015] The total mass percentage of all the above components is 100%.

[0016] The infrared-transmitting organic pigment is selected from Spectrasense Black EH 8082 from Taiyang Chemical.

[0017] Furthermore, by weight percentage, the infrared light-transmitting black aqueous pigment paste contains 10-50 wt% infrared light-transmitting organic pigment.

[0018] Furthermore, the dispersant is an aqueous dispersant selected from one or more of the following: styrene / acrylic acid copolymer, acrylic acid / maleic acid copolymer, acrylic acid / methacrylic acid copolymer, butadiene / acrylic acid copolymer, isobutylene / maleic acid copolymer, diisobutylene / maleic acid copolymer, styrene / maleic acid copolymer, and polyethylene glycol monovinyl ether / maleic acid copolymer.

[0019] Furthermore, the infrared light transmission black aqueous color paste contains 5-30 wt% dispersant by weight percentage.

[0020] Furthermore, the wetting agent is selected from one or more of modified alkoxylates, polyether-modified siloxanes, ethoxykyne diols, and siloxane dual-effect surfactants.

[0021] Furthermore, the infrared light transmission black aqueous pigment paste contains 0-2 wt% wetting agent by weight percentage.

[0022] Furthermore, the defoamer is selected from modified polysiloxane and / or polymer-based defoamers.

[0023] Furthermore, the infrared light transmission black aqueous pigment paste contains 0-1 wt% defoamer by weight percentage.

[0024] To achieve the second objective mentioned above, the present invention adopts the following technical solution:

[0025] This invention discloses a method for preparing the infrared light transmission black aqueous pigment paste as described above, comprising the following steps:

[0026] S1: Add the dispersant, wetting agent, and defoamer to a portion of water, stir and mix thoroughly to obtain mixture A;

[0027] S2: Add infrared light transmission organic pigment to mixture A, disperse at high speed, and then perform sand milling until the fineness is <10μm to obtain mixture B;

[0028] S3: Add the remaining water to mixture B, mix well, and you have the final product.

[0029] To achieve the third objective mentioned above, the present invention adopts the following technical solution:

[0030] This invention discloses an infrared-transmitting black water-based paint coating comprising the infrared-transmitting black water-based pigment as described above, which, by weight, comprises:

[0031] 10-50 parts of waterborne acrylic resin secondary dispersion;

[0032] 10-50 parts of acrylic-modified polyurethane dispersion;

[0033] 5-15 parts of amino resin;

[0034] 5-30 parts of auxiliary agent;

[0035] Solvent 1-5 parts; and

[0036] Infrared light transmission black water-based pigment, 1-10 parts.

[0037] Furthermore, the aqueous acrylic resin secondary dispersion includes, but is not limited to, one or more of BAYHYDROLA2470, Uacryl2145H, Setaqua 6803, and Lacper 4702.

[0038] The acrylic-modified polyurethane dispersion includes, but is not limited to, one or more of VIACRYL VSC6800w / 47WA, DAOTAN TW6466 / 36WA, and DAOTAN TW 6431 / 45WA;

[0039] The amino resins include, but are not limited to, one or more of Cymel 303, Cymel 325, Cymel 327, Luwipal 052, Luwipal 066, Luwipal 072, Luwipal 073, and Luwipal 070.

[0040] To achieve the fourth objective mentioned above, the present invention adopts the following technical solution:

[0041] This invention discloses an infrared light-transmitting black oily pigment, which, by mass percentage, comprises:

[0042]

[0043] The total mass percentage of all the above components is 100%.

[0044] The infrared-transmitting organic pigment is selected from Spectrasense Black EH 8082 from Taiyang Chemical.

[0045] Furthermore, by weight percentage, the infrared-transmitting black oily pigment paste contains 10-50 wt% infrared-transmitting organic pigment.

[0046] Furthermore, the dispersant is selected from one or more of acrylate polymer dispersants, polyester polymer dispersants, and polyurethane polymer dispersants.

[0047] Furthermore, the infrared light transmission black oily pigment paste contains 10-50 wt% dispersant by weight percentage.

[0048] Furthermore, the coupling agent is selected from one or more of silane coupling agents, titanate coupling agents, and aluminate coupling agents.

[0049] Furthermore, the infrared light transmission black oily pigment paste contains 0.5-2 wt% coupling agent by weight percentage.

[0050] Furthermore, the organic solvent is selected from one or more of butyl acetate, S-150 solvent oil, S-100 solvent oil, mixed diester, methyl isobutyl ketone, xylene, propylene glycol methyl ether acetate, and diacetone alcohol.

[0051] To achieve the fifth objective mentioned above, the present invention adopts the following technical solution:

[0052] This invention discloses a method for preparing the infrared light transmission black oily pigment paste as described above, comprising the following steps:

[0053] (1) Add the amount of dispersant in the formula to the organic solvent and stir at 600-1000 r / min for 5-15 min. Then, under the same stirring conditions, add the infrared light transmission organic pigment and stir at 1500-2000 r / min for 20-40 min. Then add the coupling agent and continue stirring at 1500-2000 r / min for 20-40 min to obtain the mixture C.

[0054] (2) Use a horizontal sand mill to grind and disperse the pre-dispersed mixture C in step (1), and keep grinding until the fineness of the material is dispersed to below 20μm.

[0055] To achieve the sixth objective mentioned above, the present invention adopts the following technical solution:

[0056] This invention discloses an infrared-transmitting black oil-based paint coating comprising the infrared-transmitting black oil-based pigment as described above, which, by weight, comprises:

[0057] 10-50 parts of oil-based acrylic resin;

[0058] 10-50 parts of polyurethane resin;

[0059] 5-15 parts of amino resin;

[0060] 5-30 parts of auxiliary agent;

[0061] Solvent 1-5 parts; and

[0062] 1-10 parts of infrared light transmission black oily pigment paste.

[0063] Furthermore, the oily acrylic resin is selected from the VIACRYL series and / or SETALUX series;

[0064] The polyurethane resin is selected from DIC's BURNOCK series;

[0065] The amino resin is selected from the Cymel series.

[0066] To achieve the seventh objective mentioned above, the present invention adopts the following technical solution:

[0067] This invention discloses a composite paint layer, comprising a first paint layer and a second paint layer deposited beneath the first paint layer;

[0068] The first paint layer is obtained by applying the infrared light transmission black water-based paint coating or the infrared light transmission black oil-based paint coating as described above.

[0069] The second paint layer is obtained by applying an infrared reflective coating.

[0070] Furthermore, the infrared reflective coating contains at least 5 wt% infrared reflective pigment by weight percentage.

[0071] Furthermore, the infrared reflective coating contains 5-75 wt% infrared reflective pigment by weight percentage.

[0072] Furthermore, the infrared light-reflecting pigments include, but are not limited to, one or more of the following: titanium dioxide (PW6), iron oxide yellow (CI pigment yellow 42), iron oxide red (CI pigment red 101), bismuth vanadate (CI pigment yellow 184, pigment orange 82), titanium nickel yellow (CI pigment yellow 53), titanium chromium brown (CI pigment brown 24), cobalt titanium green (CI pigment green 50), chromium oxide green (CI pigment green 17), cobalt aluminum blue (CI pigment blue 28), cobalt chromium aluminum blue (CI pigment blue 36), ultramarine blue (CI pigment blue 29), iron chromium black (CI pigment brown 29), and titanium manganese brown (CI pigment yellow 164).

[0073] The beneficial effects of this invention are as follows:

[0074] This invention discloses an infrared-transmitting black water-based / oil-based color paste containing the infrared-transmitting organic pigment Spectrasense Black EH 8082. In a color comparison experiment with titanium dioxide dilution, the a* value of this infrared-transmitting black water-based / oil-based color paste is close to 0 and the total change is less than 1.0 during the color depth change from 1 / 3 to 1 / 25. In a color comparison experiment with aluminum dilution, it can ensure that the C* value is less than 1.0 when the L* value (the color difference meter is a d / 8° Sphere type) is adjusted from 25 to 75. This indicates that the infrared-transmitting black water-based / oil-based color paste provided by this invention is beneficial for color matching of achromatic dark colors and for low-saturation color design under different aluminum powder textures, and is more conducive to meeting people's requirements for the appearance of automotive paint films.

[0075] Furthermore, this invention relates to a high solar reflectivity coating design for automobiles. Designed to meet the stringent color design requirements of the automotive manufacturing industry, this composite coating design increases the total solar radiation reflectivity of the vehicle body surface, reducing the absorption of sunlight by the passenger vehicle body and its conversion into heat, thereby lowering the temperature of the vehicle body and cabin. The coating of this invention provides a significant cooling effect on the coated vehicle under sunlight, while also possessing good durability and ease of application. It is suitable for thermal management in various vehicles, improving interior comfort, reducing the use of air conditioning in summer and carbon dioxide emissions, and also helps extend the service life of both the vehicle coating and the coated substrate. Attached Figure Description

[0076] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0077] Figure 1 The image shows a comparison chart obtained by plotting the a* values ​​against the L* data in color mixing experiment 1.

[0078] Figure 2 The image shows a comparison chart obtained by fitting the C* values ​​obtained in experiment 2 to the L* data. Detailed Implementation

[0079] To more clearly illustrate the present invention, the following description, in conjunction with preferred embodiments, further clarifies the invention. Those skilled in the art should understand that the specific descriptions below are illustrative rather than restrictive, and should not be construed as limiting the scope of protection of the present invention.

[0080] Unless otherwise specified, “parts” refers to “parts by weight”.

[0081] Given that many perylene black pigments exhibit hue deviation due to dilution during the color mixing process, this invention provides both an infrared-transmitting water-based black pigment and an infrared-transmitting oil-based black pigment for practical application.

[0082] The infrared light transmission black aqueous pigment paste comprises the following raw material components by weight percentage:

[0083]

[0084] The total mass percentage of all the above components is 100%.

[0085] The infrared-transmitting organic pigment is selected from Spectrasense Black EH 8082 from Taiyang Chemical.

[0086] Spectrasense Black EH 8082 is a novel infrared-transmitting perylene black pigment launched by Taiyang Chemical. Through screening a large number of organic pigments, the inventors discovered that water-based color pastes containing Spectrasense Black EH 8082 do not exhibit hue deviation or dilution during color mixing. This is likely because Spectrasense Black EH 8082 maintains the high transmittance of perylene black pigments in the infrared spectral region while retaining high color depth through its optimized absorption spectrum. More specifically, its molecular structure significantly enhances absorption in the 750-800 nm wavelength range. Of course, Spectrasense Black EH 8082 also achieves comparable results for oil-based color paste systems.

[0087] In some embodiments of the present invention, the infrared light-transmitting black aqueous pigment paste contains 10-50 wt% infrared light-transmitting organic pigment by weight percentage. For example, the infrared light-transmitting black aqueous pigment paste contains 10 wt%, 15 wt%, 20 wt%, 25 wt%, 30 wt%, 35 wt%, 40 wt%, 45 wt%, or 50 wt% infrared light-transmitting organic pigment.

[0088] In some embodiments of the present invention, the dispersant is an aqueous dispersant, including but not limited to one or more of styrene / acrylic acid copolymer, acrylic acid / maleic acid copolymer, acrylic acid / methacrylic acid copolymer, butadiene / acrylic acid copolymer, isobutylene / maleic acid copolymer, diisobutylene / maleic acid copolymer, styrene / maleic acid copolymer, and polyethylene glycol monovinyl ether / maleic acid copolymer. Exemplarily, the dispersant is selected from one or more high-performance dispersants such as BYK-2013, EFKA-4585, and Tego-755W, meeting the requirements of good color development, high stability, and good compatibility with coating systems when used in automotive coatings.

[0089] In some embodiments of the present invention, the infrared light transmission black aqueous pigment paste contains 5-30 wt% dispersant by weight percentage, which may vary depending on the pigment paste system.

[0090] In some embodiments of the present invention, the wetting agent is selected from one or more of modified alkoxylates, polyether-modified siloxanes, ethoxyacetylene glycol, and siloxane dual-effect surfactants, preferably wetting agents provided by companies such as BASF, BYK, and EVONIK. 104, SURFYNOL 440, CARBOWET GA-221, etc.

[0091] In some embodiments of the present invention, the infrared light transmission black aqueous pigment paste contains 0-2 wt% wetting agent by weight percentage. For example, the infrared light transmission black aqueous pigment paste contains 0.5 wt%, 1 wt%, 1.5 wt%, or 2 wt% wetting agent.

[0092] In some embodiments of the present invention, the defoamer is selected from modified polysiloxane and / or polymer-based defoamers, preferably defoamers provided by companies such as BASF, BYK, and EVONIK, for example, BYK-021. SI 2210, etc.

[0093] In some embodiments of the present invention, the infrared light transmission black aqueous pigment paste contains 0-1 wt% of defoamer by weight percentage. For example, the infrared light transmission black aqueous pigment paste contains 0.1 wt%, 0.2 wt%, 0.3 wt%, 0.4 wt%, 0.5 wt%, 0.6 wt%, 0.7 wt%, 0.8 wt%, 0.9 wt%, or 1 wt% of defoamer.

[0094] The present invention also provides a method for preparing the infrared light transmission black aqueous pigment paste as described above, comprising the following steps:

[0095] S1: Add the dispersant, wetting agent, and defoamer to a portion of water, stir and mix thoroughly to obtain mixture A;

[0096] S2: Add infrared light transmission organic pigment to mixture A, disperse at high speed, and then perform sand milling until the fineness is <10μm to obtain mixture B;

[0097] S3: Add the remaining water to mixture B, mix well, and you have the final product.

[0098] Furthermore, the stirring rate in step S1 is 800-1000 rpm; the stirring rate during high-speed dispersion in step S2 is 1500-2000 rpm.

[0099] The equipment used in the preparation method is general-purpose equipment found in paint or pigment paste production plants. It involves no complex processes, can be mass-produced industrially, and has good practicality. If necessary, appropriate amounts of rheology modifiers or bactericides can be added during the preparation steps. The rheology modifiers are added simultaneously with the dispersant, wetting agent, and defoamer in step S1, and the bactericides are added simultaneously with the remaining water in step S3.

[0100] For oil-based pigments, the formulation provided by this invention is as follows:

[0101] An infrared-transmitting black oily pigment, by mass percentage, comprises:

[0102]

[0103] The total mass percentage of all the above components is 100%.

[0104] The infrared-transmitting organic pigment is selected from Spectrasense Black EH 8082 from Taiyang Chemical.

[0105] In some embodiments of the present invention, the infrared-transmitting black oily pigment paste contains 10-50 wt% infrared-transmitting organic pigment by weight percentage. For example, the infrared-transmitting black oily pigment paste contains 10 wt%, 15 wt%, 20 wt%, 25 wt%, 30 wt%, 35 wt%, 40 wt%, 45 wt%, or 50 wt% infrared-transmitting organic pigment.

[0106] In some embodiments of the present invention, the dispersant is selected from one or more of acrylate polymer dispersants, polyester polymer dispersants, and polyurethane polymer dispersants. The structures of the above-described dispersants all include functional groups with excellent affinity for pigments, and solvation chains that can freely extend in the selected solvent system. The pigment-affinity groups in these dispersants are generally polar groups, such as carboxylic acid groups, phosphoric acid or phosphate ester groups, amino groups, amide groups, urethane groups, etc. The solvation chains in the dispersant have a similar polarity to the solvent system in the pigment paste. In this case, the solvation chain segments of the dispersant have optimal extension, thereby maximally preventing the mutual flocculation between pigment particles. These solvation chains can be low-polarity alkane chains or polyester chains, medium-polarity polyester chains, or acrylate chains.

[0107] In some embodiments of the present invention, the dispersant has a number average molecular weight of 5000-25000, preferably 10000-20000, and a PDI of 1.0-5.0, preferably 1.0-3.0. Specifically, the dispersant is selected from one or more of the following types of dispersants: those provided by Byk Chemie. Dispersants, including but not limited to those with the following specifications: BYK-161, BYK-163, BYK-170, BYK-180, BYK-2000, and BYK-2013; and those provided by BASF. Dispersants, including but not limited to Efka PU 4010, Efka PU 4050, Efka PA4401, and Efka PX 4780. PX 4310, PX 4330 dispersant; supplied by Lubrizol. Dispersants, including but not limited to dispersants with the model numbers Solsperse 24000 and Solsperse 32500.

[0108] In some embodiments of the present invention, the infrared light transmission black oily pigment paste contains 10-50 wt% dispersant, preferably 30-50 wt%, by weight percentage.

[0109] In some embodiments of the present invention, the coupling agent is selected from one or more of silane coupling agents, titanate coupling agents, and aluminate coupling agents. Specifically, the silane coupling agent is selected from DynasylanDAMO and Dynasylan 1124 provided by EVONIK. 1189, Dynasylan 9116, 9896, DynasylanVPS 4721, model number provided by Momentive. A-174NT, Coatosil MP200, and one or more of the silane coupling agents KBE-9103, KBE-603, KBE-585, KBE-402, and KBE-403 provided by Shin-Etsu Chemical Co., Ltd. of Japan; the titanate coupling agent is selected from one or more of the titanate coupling agents Plenact 44 and Plenact 55 provided by Ajinomoto Co., Ltd., and KR-38S and KR-TTS provided by Kenrich Co., Ltd. of the United States; the aluminate coupling agent is selected from one or more of the aluminate coupling agents PLENACT AL-M provided by Ajinomoto Co., Ltd., LK-AL181 provided by Longkai Chemical Co., Ltd., and GR-AL18 provided by Nanjing Herun Coupling Agent Co., Ltd.

[0110] In some embodiments of the present invention, the infrared light transmission black oily pigment paste contains 0.5-2 wt% coupling agent by weight percentage.

[0111] In some embodiments of the present invention, the organic solvent is selected from one or more of butyl acetate, S-150 solvent oil, S-100 solvent oil, mixed diesters, methyl isobutyl ketone, xylene, propylene glycol methyl ether acetate, and diacetone alcohol. In some preferred embodiments of the present invention, the selected organic solvent is a mixture of butyl acetate and methyl isobutyl ketone in a mass ratio of 1:1.

[0112] The present invention also provides a method for preparing the infrared light transmission black oily pigment paste as described above, comprising the following steps:

[0113] (1) Add the amount of dispersant in the formula to the organic solvent and stir at 600-1000 r / min for 5-15 min. Then, under the same stirring conditions, add the infrared light transmission organic pigment and stir at 1500-2000 r / min for 20-40 min. Then add the coupling agent and continue stirring at 1500-2000 r / min for 20-40 min to obtain the mixture C.

[0114] (2) Use a horizontal sand mill to grind and disperse the pre-dispersed mixture C in step (1), and keep grinding until the fineness of the material is dispersed to below 20μm.

[0115] In some embodiments of the present invention, the grinding medium used for grinding and dispersing in step (2) of the method for preparing infrared light transmission black oily pigment paste is zirconia beads; preferably, the diameter of the zirconia beads is 0.3-1.0 mm and the filling rate is 70%-90%; more preferably, the diameter of the zirconia beads is 0.6-0.8 mm and the filling rate is 80%.

[0116] To better meet customers' coating requirements, this invention also discloses an infrared-transmitting black water-based paint coating comprising the infrared-transmitting black water-based pigment as described above, comprising, by weight parts:

[0117] 10-50 parts of waterborne acrylic resin secondary dispersion;

[0118] 10-50 parts of acrylic-modified polyurethane dispersion;

[0119] 5-15 parts of amino resin;

[0120] 5-30 parts of auxiliary agent;

[0121] Solvent 1-5 parts; and

[0122] Infrared light transmission black water-based pigment, 1-10 parts.

[0123] In some embodiments of the present invention, the total mass of the waterborne acrylic resin secondary dispersion and the acrylic modified polyurethane dispersion accounts for 50-100 wt% of the total mass of the waterborne paint composition, but not 100 wt%.

[0124] In some embodiments of the present invention, the aqueous acrylic resin secondary dispersion includes, but is not limited to, one or more of BAYHYDROLA2470, Uacryl 2145H, Setaqua 6803, and Lacper 4702.

[0125] The acrylic-modified polyurethane dispersion includes, but is not limited to, one or more of VIACRYL VSC6800w / 47WA, DAOTAN TW6466 / 36WA, and DAOTAN TW 6431 / 45WA;

[0126] The amino resins include, but are not limited to, one or more of Cymel 303, Cymel 325, Cymel 327, Luwipal 052, Luwipal 066, Luwipal 072, Luwipal 073, and Luwipal 070.

[0127] In some specific examples, the preparation method of the infrared light transmission black water-based paint coating includes the following steps:

[0128] The waterborne acrylic resin secondary dispersion, acrylic modified polyurethane dispersion, solvent, and some additives (such as dispersants) are mixed according to the formula. The infrared light transmission black waterborne pigment paste prepared above is added and mixed. Then, some additives (such as defoamers, wetting agents, pH adjusters, etc.) and amino resin are added to obtain the infrared light transmission black waterborne paint coating.

[0129] This invention also discloses an infrared-transmitting black oil-based paint coating comprising the infrared-transmitting black oil-based pigment as described above, which, by mass parts, comprises:

[0130] 10-50 parts of oil-based acrylic resin;

[0131] 10-50 parts of polyurethane resin;

[0132] 5-15 parts of amino resin;

[0133] 5-30 parts of auxiliary agent;

[0134] Solvent 1-5 parts; and

[0135] 1-10 parts of infrared light transmission black oily pigment paste.

[0136] In some embodiments of the present invention, the oily acrylic resin includes, but is not limited to, the VIACRYL series and / or SETALUX series;

[0137] The polyurethane resins include, but are not limited to, DIC’s BURNOCK series;

[0138] The amino resins include, but are not limited to, the Cymel series.

[0139] In some specific examples, the preparation method of the infrared light transmission black oil-based paint coating includes the following steps:

[0140] The oil-based acrylic resin, polyurethane resin, solvent, and some additives (such as dispersants) are mixed according to the formula. The infrared light transmission black oil-based pigment paste prepared above is added and mixed. Then, some additives (such as defoamers, wetting agents, pH adjusters, etc.) and amino resin are added to obtain the infrared light transmission black oil-based paint coating.

[0141] Meanwhile, this invention also specifically designs a passenger vehicle body coating that reduces the temperature of the vehicle body and interior by improving the absorption of sunlight by the automotive coating, as detailed below:

[0142] A composite paint layer includes a first paint layer and a second paint layer deposited beneath the first paint layer;

[0143] The coating adopts a double-layer design. The outer first color paint layer is applied with the infrared light transmission black water-based paint or infrared light transmission black oil-based paint as described above. The inner second color paint layer is applied with infrared reflective paint. The specific type of infrared reflective paint is not limited, but it should be able to enable the overall coating to meet the relevant performance tests of automotive coatings. Other coatings on the vehicle body (such as clear coat and electrophoretic coating) can use conventional coatings.

[0144] In some specific examples, the infrared reflective coating contains at least 5 wt% infrared reflective pigment by weight percentage, preferably 5-75 wt% infrared reflective pigment by weight percentage. Because it contains infrared reflective pigment, the infrared reflective coating has infrared reflective function after application, working together with the first color paint layer to reduce the temperature of the vehicle body and cabin. For example, the infrared reflective pigment is selected from one or more of titanium dioxide (PW6), iron oxide yellow (CI pigment yellow 42), iron oxide red (CI pigment red 101), bismuth vanadate (CI pigment yellow 184, pigment orange 82), titanium nickel yellow (CI pigment yellow 53), titanium chromium brown (CI pigment brown 24), cobalt titanium green (CI pigment green 50), chromium oxide green (CI pigment green 17), cobalt aluminum blue (CI pigment blue 28), cobalt chromium aluminum blue (CI pigment blue 36), ultramarine blue (CI pigment blue 29), iron chromium black (CI pigment brown 29), and titanium manganese brown (CI pigment yellow 164).

[0145] The technical solution of this application will be further described below through specific embodiments. As mentioned above, the infrared light transmission black water-based (or oil-based) color paste emphasized by this invention can guarantee the rich color matching needs of automotive paint, as will be demonstrated in the following comparison.

[0146] Color Toning Experiment 1

[0147] Example 1

[0148] This example provides a process for preparing an infrared light transmission black aqueous pigment paste:

[0149] S1: Put Tego-755W 300.0g, 1045.0g SI 22105.0g is added to 500.0g of water and stirred until well mixed to obtain mixture A;

[0150] S2: Add 250g of infrared light transmission organic pigment Spectrasense Black EH8082 to mixture A, disperse at high speed, and then perform sand milling until the fineness is <10μm to obtain mixture B;

[0151] S3: Add the remaining 33.0g of water to mixture B, mix well, and the mixture is ready.

[0152] The stirring rate in step S1 is 800-1000 rpm; the stirring rate during high-speed dispersion in step S2 is 1500-2000 rpm.

[0153] Comparative Example 1

[0154] This example provides a process for preparing an infrared light transmission black aqueous pigment paste:

[0155] S1: Put Tego-755W 300g, 1045.0g SI 22105.0g is added to 500.0g of water and stirred until well mixed to obtain mixture A;

[0156] S2: Add infrared-transmitting organic pigment to mixture A Black L 0086250g was dispersed at high speed and then sand-milled until the fineness was <10μm to obtain mixture B;

[0157] S3: Add the remaining 33.0g of water to mixture B, mix well, and the mixture is ready.

[0158] The stirring rate in step S1 is 800-1000 rpm; the stirring rate during high-speed dispersion in step S2 is 1500-2000 rpm.

[0159] Comparative Example 2

[0160] This example provides a process for preparing an infrared light transmission black aqueous pigment paste:

[0161] S1: Put Tego-755W 300g, 1045.0g SI 22105.0g is added to 500.0g of water and stirred until well mixed to obtain mixture A;

[0162] S2: Add 180g of carbon black FW255 to mixture A, disperse at high speed, and then perform sand milling until the fineness is <10μm to obtain mixture B;

[0163] S3: Add the remaining 33.0g of water to mixture B, mix well, and the mixture is ready.

[0164] The stirring rate in step S1 is 800-1000 rpm; the stirring rate during high-speed dispersion in step S2 is 1500-2000 rpm.

[0165] In the color comparison experiment of titanium dioxide dilution, Example 1 used an aqueous colorant containing Spectrasense Black EH8082, while Comparative Example 1 used a colorant containing... Black L 0086 water-based pigment, and Comparative Example 2 uses water-based pigment containing FW255 carbon black.

[0166] The three water-based color pastes were adjusted to 1 / 3, 1 / 9, and 1 / 25 color depth in automotive acrylic coatings, respectively. The color data of black and white cardstock were obtained and are shown in Table 1 below.

[0167] Table 1

[0168]

[0169] Plot the corresponding a* values ​​against the L* data to obtain... Figure 1 It is not difficult to observe that as the titanium dioxide dilution depth decreases from 1 / 3 to 1 / 25, the a* value in Comparative Example 1 shows a significant shift from 0, while the a* value in Example 1 shows a very small shift, close to that of Comparative Example 2 using FW255 carbon black. Overall, in Example 1, throughout the entire process of the color depth changing from 1 / 3 to 1 / 25, the a* value is closer to 0 and the change value is less than 1.0. The trend of a* change in the water-based pigment of Example 1 during the titanium dioxide dilution process is closer to the trend of the FW255 carbon black pigment, indicating that the water-based pigment of Example 1 is beneficial for tinting achromatic dark colors. Thus, in the design of coatings with high solar reflectivity, when facing the actual tinting application of paints, the water-based black pigment listed in Example 1 can enrich the tinting options and more easily achieve the tinting target requirements without increasing the amount of other tinting pigments or color materials used.

[0170] Color Toning Experiment 2

[0171] The pigment formulations used in Examples 2-6 are the same as those in Example 1, and the pigment formulations used in Comparative Examples 3-7 are the same as those in Comparative Example 1.

[0172] In the aluminum dilution and color comparison experiment, the water-based color pastes of Example 1 and Comparative Example 1 were combined with different amounts of aluminum paste 6320NS (see Table 2), and then compounded with other resins and additives to prepare water-based paint coatings. The only difference between each example and the comparative example was the amount of aluminum paste added. The obtained coatings were scraped onto black and white cardstock, dried, and the color data on the black background of the color card in SCI reflection mode were measured using an X-rite colorimeter, as shown in Table 3 below.

[0173] Table 2

[0174]

[0175] Note: The addition amounts of water-based pigments and aluminum silver pastes in Table 2 are relative to 100 parts of water-based paint.

[0176] Table 3

[0177] Example 2 25.29 -0.02 -0.50 0.50 268.19 Example 3 30.78 -0.02 -0.44 0.44 267.38 Example 4 46.87 -0.05 -0.26 0.27 259.66 Example 5 61.28 -0.16 -0.43 0.46 249.72 Example 6 67.67 -0.24 -0.53 0.58 245.21 Comparative Example 3 25.92 -0.53 -0.29 0.61 208.87 Comparative Example 4 32.52 -2.42 1.91 3.08 141.64 Comparative Example 5 50.51 -5.17 5.40 7.48 133.75 Comparative Example 6 64.61 -5.2 5.16 7.32 135.23 Comparative Example 7 70.78 -4.62 4.33 6.33 136.90

[0178] Plot the C* data against the L* data in Table 3, and perform linear fitting on the point values ​​obtained in Examples 2-6 and Comparative Examples 3-7, respectively. See [reference needed]. Figure 2 As can be seen, with the change of L* value, the C* value in the curves fitted in Examples 2-6 remains close to 0, consistently less than 1, while the C* value in the curves fitted in Comparisons 3-7 significantly increases with the increase of aluminum powder added during aluminum powder dilution. Visually, the color swatches of Comparisons 4-7 exhibit a distinct green hue, while Examples 2-6 are all silver-gray. Through this comparison, it is clear that in the aluminum dilution process commonly used in automotive paint tinting, the water-based color paste prepared in this invention can ensure that the hue does not shift, indicating that this water-based color paste is beneficial for low-saturation color design under different aluminum powder texture conditions.

[0179] The above experiments revealed that the water-based colorant or water-based paint containing Spectrasense Black EH8082 provided by this invention exhibits significant advantages in color matching experiments, more easily meeting the diverse current demands for automotive paint color matching, and is superior to similar products. Black L 0086.

[0180] Sample artificial simulation of solar radiation experiment

[0181] Water-based paint coatings with a color depth of 1 / 3 STD were prepared from the water-based pigments of Example 1, Comparative Example 1, and Comparative Example 2, respectively, and used for electrophoretic coating. The only difference between the three coatings was the pigment composition in the water-based pigment. Samples were prepared by manual spraying using ANEST IWTAWIDER 1 equipment. The prepared samples met the film thickness requirements in Table 4 below under the corresponding drying conditions.

[0182] Table 4

[0183] First coat of paint (water-based white intermediate coat) 15-18 5 80℃*5min Second paint layer (Example 1 & Comparative Examples 1 and 2) 12-15 5 80℃*8min Two-component clear varnish 45-50 5 140℃*30min

[0184] The full solar reflectance of the sample was tested and the TSR of the sample was calculated. Then, the sample was subjected to artificial solar irradiation heating test. The TSR and equilibrium temperature are shown in the table below.

[0185] Table 5

[0186] Example 1 0.366 70.6 Comparative Example 1 0.374 70.5 Comparative Example 2 0.082 91.5

[0187] As can be seen, at 1 / 3 STD color depth, Example 1 Spectrasense Black EH8082 and Comparative Example 1... The TSR and equilibrium temperature of Black L 0086, both of which are close to those of the artificially simulated heating, are superior to those of the carbon black in Comparative Example 2. Therefore, at lighter color depths, Example 1 maintains a similar level of thermal management capability as Comparative Example 1.

[0188] Whole vehicle cooling effect experiment

[0189] The water-based pigments of Example 1 and Comparative Example 2 were prepared into coatings for vehicle body spraying, ensuring that the only difference between the two coatings was the pigment composition in the water-based pigments. The vehicle body coating was prepared by robotic automatic spraying, and the spraying equipment was the LACTECH automatic spraying machine.

[0190] The spraying process is as follows: robot spraying → leveling for 5-8 minutes → baking at 80℃ for 5-8 minutes → baking at 140℃ for 30 minutes.

[0191] Spraying conditions: Temperature 24℃, Humidity: 65%.

[0192] The parameters of the above coating preparation equipment are shown in Table 6 below.

[0193] Table 6

[0194]

[0195]

[0196] The specific coating preparation parameters are shown in Table 7 below.

[0197] Table 7

[0198] First coat of paint (water-based white intermediate coat) 15-18 5 80℃*5min Second paint layer (Example 1 & Comparative Example 2) 12-15 5 80℃*8min Two-component clear varnish 45-50 5 140℃*30min

[0199] Note: The water-based white intermediate coat contains 54 wt% titanium dioxide (PW6) pigment.

[0200] The coating film on plastic parts is prepared by robotic automatic spraying, and the spraying equipment is the LACTECH automatic spraying machine.

[0201] The parameters of the above coating preparation equipment are shown in Table 8 below.

[0202] Table 8

[0203] equipment ECOgun2 ABBRB1000 ABBRB1000 Gun distance (mm) 250 250 250 Gun velocity (m / s) 0.8 0.7 0.7 Atomized air (nL / min) 280 - - Air pressure at spray gun angle (nL / min) 350 - - Forming air volume 1 (nL / min) - 280 400 Forming air volume 1 (nL / min) - 180 200 Interval (mm) 80 100 100 Flow rate (mL / min) 300 250 300 Voltage (kV) - - 60

[0204] The specific coating preparation parameters are shown in Table 9 below.

[0205] Table 9

[0206] White conductive primer 8-10 10 / Paint (using the color pastes from Example 1 & Comparative Example 2) 15-30 10 / Clear varnish 30-40 / 85℃*35min

[0207] Test conditions: Cloudy weather, temperature 29-36℃ (actual air temperature ~36.4℃, surface temperature ~57℃), southeast wind force 3; solar irradiance measured by DELIXIDLY-1802 digital lux meter was 141.9×10 3 Lx.

[0208] The measured vehicle body balance temperature is shown in Table 10 below.

[0209] Table 10

[0210] Example 2 68.9 46.2 Comparative Example 3 79.2 50.6

[0211] Note: Example 2 is a B-class sedan with the body and plastic parts coated with infrared transmission paint and white intermediate coat prepared from the color paste of Example 1. Comparative Example 3 is a B-class sedan with the body and plastic parts coated with the original factory paint, that is, the combination of infrared transmission paint and white intermediate coat prepared from the color paste of Comparative Example 2.

[0212] Note that the vehicle body temperature in Table 10 refers to the temperature of components directly exposed to sunlight, and is the average of three test points for these components. For example, when the front of the car is facing the sun, the temperature of the hood and front bumper is the vehicle body temperature. When the side of the car is facing the sun, the temperature of the door in direct sunlight is the vehicle body temperature. When the sunlight is not perpendicular to the irradiated area, the temperature may be slightly lower. The cabin air balance temperature was measured using a UNI-T UT333 digital thermo-hygrometer.

[0213] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. An infrared light-transmitting black aqueous pigment, characterized in that, It includes, by mass percentage: The total mass percentage of all the above components is 100%. The infrared-transmitting organic pigment is selected from Spectrasense Black EH 8082 from Taiyang Chemical.

2. The infrared light transmission black aqueous pigment according to claim 1, characterized in that, The infrared-transmitting black aqueous pigment paste contains 10-50 wt% infrared-transmitting organic pigment by weight percentage.

3. The infrared light transmission black aqueous pigment according to claim 1, characterized in that, The dispersant is an aqueous dispersant selected from one or more of the following: styrene / acrylic acid copolymer, acrylic acid / maleic acid copolymer, acrylic acid / methacrylic acid copolymer, butadiene / acrylic acid copolymer, isobutylene / maleic acid copolymer, diisobutylene / maleic acid copolymer, styrene / maleic acid copolymer, and polyethylene glycol monovinyl ether / maleic acid copolymer. The wetting agent is selected from one or more of the following: modified alkoxylates, polyether-modified siloxanes, ethoxyacetylene glycol, and siloxane dual-effect surfactants. The defoamer is selected from modified polysiloxane and / or polymer-based defoamers; Preferably, the infrared light transmission black aqueous color paste contains 5-30 wt% dispersant by weight percentage; Preferably, the infrared light transmission black aqueous pigment paste contains 0-2 wt% wetting agent by weight percentage; Preferably, the infrared light transmission black aqueous pigment paste contains 0-1 wt% defoamer by weight percentage.

4. The method for preparing infrared light transmission black aqueous pigment paste according to any one of claims 1-3, characterized in that, Includes the following steps: S1: Add the dispersant, wetting agent, and defoamer to a portion of water, stir and mix thoroughly to obtain mixture A; S2: Add infrared light transmission organic pigment to mixture A, disperse at high speed, and then perform sand milling until the fineness is <10μm to obtain mixture B; S3: Add the remaining water to mixture B, mix well, and you have the final product.

5. An infrared light-transmitting black water-based paint coating, characterized in that, By weight, it includes: 10-50 parts of waterborne acrylic resin secondary dispersion; 10-50 parts of acrylic-modified polyurethane dispersion; 5-15 parts of amino resin; 5-30 parts of auxiliary agent; Solvent 1-5 parts; and 1-10 parts of the infrared light transmission black aqueous pigment as described in any one of claims 1-3.

6. The infrared light transmission black water-based paint coating according to claim 5, characterized in that, The aqueous acrylic resin secondary dispersion is selected from one or more of BAYHYDROLA2470, Uacryl 2145H, Zhanxin Setaqua 6803, and Wanhua Lacper4702; The acrylic-modified polyurethane dispersion is selected from one or more of VIACRYL VSC6800w / 47WA, DAOTAN TW6466 / 36WA, and DAOTAN TW 6431 / 45WA; The amino resin is selected from one or more of Cymel 303, Cymel 325, Cymel 327, Luwipal 052, Luwipal 066, Luwipal 072, Luwipal 073, and Luwipal 070.

7. An infrared-transmitting black oily pigment, characterized in that, It includes, by mass percentage: The total mass percentage of all the above components is 100%. The infrared-transmitting organic pigment is selected from Spectrasense Black EH 8082 from Taiyang Chemical.

8. The infrared light transmission black oily pigment paste according to claim 7, characterized in that, The infrared-transmitting black oily pigment paste contains 10-50 wt% infrared-transmitting organic pigment by weight percentage.

9. The infrared light transmission black oily pigment paste according to claim 7, characterized in that, The dispersant is selected from one or more of acrylate polymer dispersants, polyester polymer dispersants, and polyurethane polymer dispersants. The coupling agent is selected from one or more of silane coupling agents, titanate coupling agents, and aluminate coupling agents; The organic solvent is selected from one or more of butyl acetate, S-150 solvent oil, S-100 solvent oil, mixed diester, methyl isobutyl ketone, xylene, propylene glycol methyl ether acetate, and diacetone alcohol; Preferably, the infrared light-transmitting black oily pigment paste contains 10-50 wt% dispersant by weight percentage; Preferably, the infrared light-transmitting black oily pigment paste contains 0.5-2 wt% coupling agent by weight percentage.

10. The method for preparing infrared light transmission black oily pigment paste according to any one of claims 7-9, characterized in that, Includes the following steps: (1) Add the amount of dispersant in the formula to the organic solvent and stir at 600-1000 r / min for 5-15 min. Then, under the same stirring conditions, add the infrared light transmission organic pigment and stir at 1500-2000 r / min for 20-40 min. Then add the coupling agent and continue stirring at 1500-2000 r / min for 20-40 min to obtain the mixture C. (2) Use a horizontal sand mill to grind and disperse the pre-dispersed mixture C in step (1), and keep grinding until the fineness of the material is dispersed to below 20μm.

11. An infrared-transmitting black oil-based paint coating, characterized in that, By weight, it includes: 10-50 parts of oil-based acrylic resin; 10-50 parts of polyurethane resin; 5-15 parts of amino resin; 5-30 parts of auxiliary agent; Solvent 1-5 parts; and 1-10 parts of the infrared light transmission black oily pigment as described in any one of claims 7-9.

12. The infrared light transmission black oil-based paint coating according to claim 11, characterized in that, The oily acrylic resin is selected from the VIACRYL series and / or SETALUX series of ZINX; The polyurethane resin is selected from DIC's BURNOCK series; The amino resin is selected from the Cymel series.

13. A composite paint layer, characterized in that, It includes a first paint layer and a second paint layer deposited beneath the first paint layer; The first paint layer is obtained by applying the infrared light transmission black water-based paint coating as described in claim 5 or 6, or the infrared light transmission black oil-based paint coating as described in claim 11 or 12. The second paint layer is obtained by applying an infrared reflective coating.

14. The composite paint layer according to claim 13, characterized in that, The infrared reflective coating contains at least 5 wt% infrared reflective pigment by weight percentage; Preferably, the infrared reflective coating contains 5-75 wt% infrared reflective pigment by weight percentage; Preferably, the infrared light-reflecting pigment is selected from one or more of PW6, CI pigment yellow 42, CI pigment red 101, CI pigment yellow 184, CI pigment orange 82, CI pigment yellow 53, CI pigment brown 24, CI pigment green 50, CI pigment green 17, CI pigment blue 28, CI pigment blue 36, CI pigment blue 29, CI pigment brown 29, and CI pigment yellow 164.

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