Silver functional coating with high infrared transmittance, preparation method and application thereof

Abstract

The present application relates to a kind of high infrared transmittance silver color functional coating, by mass percentage, it includes 1-8% silver color flaky inorganic pigment, 25-65% water-based resin, 5-15% crosslinking agent, 1-10% rheological auxiliary agent, 1-5% other auxiliary agent, 2-10% cosolvent, 1-5% pH regulator, 5-40% deionized water, the mass percentage of above component is 100%.The high infrared transmittance silver color functional coating selects the appearance silver inorganic oxide flaky pigment, and is matched with suitable resin, auxiliary agent formula system, the functional coating obtained has high infrared transmittance while having silver appearance, can show good transmittance performance to near infrared, mid-infrared and far infrared, can be widely applied in glass, polycarbonate and other commonly used transparent material, play the effect of high adhesion, high weather resistance, easy construction.The present application also includes the preparation method and application of the high infrared transmittance silver color functional coating.

Description

Technical Field

[0001] This invention relates to the field of functional coatings, specifically to a silver functional coating with high infrared transmittance that can be used in fields such as autonomous driving, smart homes, and security monitoring, as well as a method for preparing the functional coating and its applications. Background Technology

[0002] Infrared waves generally refer to electromagnetic waves with wavelengths between 0.75 and 1000 μm, specifically divided into near-infrared waves (0.75-2.5 μm), mid-infrared waves (2.5-25 μm), and far-infrared waves (25-1000 μm). Applications closely related to daily life primarily utilize near-infrared and mid-infrared waves, such as LiDAR sensors (typically with wavelengths of 905 nm and 1550 nm) used in autonomous driving, short-wave infrared cameras and mid-wave infrared thermal imaging cameras (typically with wavelengths less than 10 μm) used in smart homes or security systems, and long-wave infrared cameras used in intelligent assisted driving systems. In these application areas, some scenarios have high requirements for the appearance of the equipment, such as home smart appliances, commercial or industrial cameras, and infrared sensors used in automobiles, which typically require simple, understated dark-toned coatings such as black and silver. Silver coatings, in particular, are popular for their understated, textured, and elegant characteristics.

[0003] Currently, infrared-transparent black coatings have been widely developed and are gradually becoming commercially available, such as the pyrene black structure infrared-transparent pigment developed by BASF, or mixed infrared-transparent pigments made by blending high-transparency red, yellow, and blue pigments. Silver coatings, however, primarily achieve their silver appearance by adding flake-like aluminum pigment. Since aluminum flakes have a shielding effect on a wide range of electromagnetic waves (such as visible, infrared, and millimeter waves), even a small amount significantly reduces infrared penetration. Therefore, there are currently no publicly reported silver coatings with good infrared transmittance.

[0004] In view of this, there is an urgent need in the field to develop a silver functional coating with high infrared transmittance to solve the problems existing in the prior art. Summary of the Invention

[0005] Based on the above facts, the purpose of this invention is to provide a silver functional coating with high infrared transmittance. It uses a type of inorganic oxide flake pigment with a silver appearance and is combined with a suitable resin and additive formulation system. The resulting functional coating has a silver appearance and high infrared transmittance. It can exhibit good transmittance performance in near-infrared, mid-infrared and far-infrared regions. It can be widely used on commonly used transparent materials such as glass and polycarbonate, and achieves the effects of high adhesion, high weather resistance and easy construction.

[0006] A first aspect of the present invention provides a silver functional coating with high infrared transmittance, comprising, by weight percentage:

[0007]

[0008] The total mass percentage of all the above components is 100%.

[0009] Silver flake inorganic pigment

[0010] In this invention, the silver flake-like inorganic pigment is a solid powder flake material with a multi-layered flake structure. This multi-layered flake structure includes an inner layer and an outer layer. The inner layer consists of, but is not limited to, synthetic mica flakes, natural mica flakes, alumina flakes, and glass flakes. The outer layer consists of, but is not limited to, magnesium aluminum oxide, fluorine oxides, titanium iron oxide, iron oxide, and titanium dioxide. The refractive index of the outer layer is greater than that of the inner layer. The silver flake-like inorganic pigment contains various specific elements existing in oxide form, such as iron, titanium, aluminum, fluorine, silicon, and magnesium. By selecting suitable resins and additives, this invention enables coatings using this inorganic flake-like pigment to have a metallic sheen and shimmering appearance similar to aluminum-containing coatings, and can exhibit various colors such as silver, silver-gray, and silver-white. The silver flake-like inorganic pigment can typically be directly dispersed in water for use.

[0011] In some preferred embodiments of the present invention, the D50 of the silver flake inorganic pigment is in the range of 5-50 μm and the average thickness is 100-1000 nm.

[0012] In some preferred embodiments of the present invention, the multilayer sheet structure is arranged in a planar manner in the coating, and the planarity is parallel to the coating surface.

[0013] In some preferred embodiments of the present invention, the refractive index of the inner layer structure is less than 1.8, and the refractive index of the outer layer structure is greater than 1.8.

[0014] Specifically, the silver flake inorganic pigment is selected from one or more of the following silver flake inorganic pigments provided by Merck: xirallic T61-10WNT microsilver, xirallic T60-10 WNT crystalsilver, iriodin 9605Blue-ShadeSilver SW, iriodin 9612Silvergrey Fine Satin SW, and iriodin 9602silver-grey SW; and from Aika: OEM FINE silver, OEM MEDIMM silver, OEM FINE Opaque silver, and OEM MEDIMM Opaque silver.

[0015] water-based resin

[0016] In this invention, the aqueous resin includes, but is not limited to, one or more of aqueous acrylic resin and aqueous polyurethane resin. The aqueous resin can be an aqueous dispersion or an aqueous emulsion, and may or may not contain reactive functional groups such as hydroxyl or carboxyl groups.

[0017] Waterborne acrylic resin

[0018] Waterborne acrylic resins possess characteristics such as high weather resistance, broad substrate adhesion, and good hardness. In some embodiments of the present invention, the solid content of the waterborne acrylic resin is preferably 20-50%, and the hydroxyl content is preferably 1-5%.

[0019] Specifically, the waterborne acrylic resin is selected from one or more of the following: BURNOCK WD-570, BURNOCK WD-581, WATERSOL WLW-270, and ACRYDIC BK-8204 provided by DIC Resins; Wantipro 0678, Antkote 2032, Antkote 2043, and Antkote 2083 provided by Wanhua Chemical Company; and Bayhydrol A2646, Bayhydrol A2470, and Bayhydrol A2695 provided by Covestro.

[0020] Waterborne polyurethane resin

[0021] In this invention, the waterborne polyurethane resin is selected from one or more of waterborne polyurethane dispersions, acrylic modified polyurethane dispersions, aliphatic modified polyurethane dispersions, and polyester modified polyurethane dispersions.

[0022] In some embodiments of the present invention, the waterborne polyurethane resin is free of hydroxyl groups, preferably has a solid content of 20-50%, a glass transition temperature (Tg) < 0°C, and a minimum film-forming temperature (MFTT) < 5°C.

[0023] Specifically, the waterborne polyurethane resin is selected from one or more of the following: 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 Zhanxin Resins.

[0024] rheology modifiers

[0025] In some embodiments of the present invention, the rheology modifier is selected from one or a combination of organic rheology modifiers, inorganic rheology modifiers, and so on. The organic rheology modifiers include, but are not limited to, one or more of polyamide wax, EVA wax, polyolefin wax, and polyurethane thickeners, and the inorganic rheology modifiers include, but are not limited to, one or more of silicate substances, bentonite, and silica.

[0026] Specifically, the rheology modifier is selected from one or more of the following: BYK's AQUATIX 8421, LAPONITE-RD, RHEOBYK-440, and RHEOBYK-7420; BASF's Rheovis series HS1212, HS1303, AS1130, AS1189, PU1235, and PU1250; and Hemings' Bentone DE. LAPONITE-RD is pre-dispersed in a 3% aqueous solution for use, and Bentone DE is pre-dispersed in a 10% aqueous solution for use.

[0027] Other additives

[0028] In this invention, the other additives are selected from one or more of wetting and leveling agents, defoamers, and dispersants.

[0029] Specifically, the wetting and leveling agent is selected from one or more of the wetting and leveling agents provided by BYK (models 347, 349, 3451, 381, 3560, 3455) and the hydropalat@WE series (models 3179, 3189, 3220, 3225, 3229) provided by BASF. The defoamer is selected from one or more of the defoamers provided by BYK (models 011, 024, 015, 028, 1710) and the Foamaster series (models SI2281, SI2210, SI2299) provided by BASF. The dispersant is selected from one or more of the dispersants provided by BYK (models 190, 192, 180, 2012, 2014) and the Dispex series (models ULTRAPX4550, 4522, 4525, 4575) provided by BASF.

[0030] Cosolvent

[0031] In some embodiments of the present invention, the co-solvent comprises deionized water and a film-forming solvent added in an amount not exceeding 10%. The film-forming solvent is selected from one or more of isooctanol, 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 acetate, ethylene glycol ethyl ether, diethylene glycol ethyl ether, and dodecyl alcohol ester.

[0032] pH adjuster

[0033] In some embodiments of the present invention, the pH adjuster is a 10% dimethylethanolamine solution (DMEA).

[0034] Crosslinking agent

[0035] In this invention, the crosslinking agent is selected from one of waterborne amino resin and waterborne isocyanate.

[0036] Waterborne amino resin

[0037] In this invention, the waterborne amino resin is selected from one or more of waterborne high iminoamino resin, high alkylated amino resin, and partially alkylated amino resin, and the solid content is preferably 70-100%. It can be partially or completely dispersed in water, and its addition can improve the hardness, strength, weather resistance, adhesion and other properties of the coating.

[0038] Specifically, the waterborne amino resin is selected from one or more of the following: CYMEL 325, CYMEL327, CYMEL 303LF, and CYMEL 350 provided by Zhanxin Resin Co., Ltd., and LUWIPAL 066, LUWIPAL 069, and LUWIPAL 072 provided by BASF.

[0039] Waterborne isocyanates

[0040] In this invention, the aqueous isocyanate is selected from aqueous hexamethylene diisocyanate and other benzene-free aqueous isocyanates, with a preferred solid content of 40-80%, a preferred viscosity of 100-500 mPa·s, and a preferred NCO content of 5-12%, exhibiting high weather resistance and toughness. The aqueous isocyanate can complete the curing and crosslinking reaction at a relatively low temperature (80-100℃), making it suitable for plastic substrates that are not heat-resistant. The aqueous isocyanate is diluted with a co-solvent at a 1:1 ratio before use.

[0041] Specifically, the aqueous isocyanate is selected from one or more of the following: Bayhydur 2858XP, Bayhydur 401-60, and Bayhydur ultra 2700 provided by Covestro; Aquolin 268, Aquolin 278, and Aquolin 280 provided by Wanhua Chemical Company; and Basonat HI2000 and Basonat HW 2100 provided by BASF.

[0042] A second aspect of the present invention provides a method for preparing a silver functional coating with high infrared transmittance, as described in the first aspect of the present invention, using an aqueous amino resin as a crosslinking agent, comprising the following steps:

[0043] S1: Add deionized water, some other additives, and silver inorganic flake pigment to a mixing tank and stir at 100-300 r / min for 30 min;

[0044] S2: While keeping the mixture stirred, continue to add the water-based resin, crosslinking agent water-based amino resin, rheology modifier, remaining other additives, and cosolvent in sequence, and stir until fully mixed;

[0045] S3: Adjust the pH to 7.5-8.5 using a pH adjuster to obtain the silver functional coating with high infrared transmittance.

[0046] A third aspect of the present invention provides a method for preparing a silver functional coating with high infrared transmittance, as described in the first aspect of the present invention, using an aqueous isocyanate as a crosslinking agent, comprising the following steps:

[0047] S1: Add deionized water, some other additives, and silver inorganic flake pigment to a mixing tank and stir at 100-300 r / min for 30 min;

[0048] S2: While maintaining stirring, continue to add the aqueous resin, rheology modifier, remaining other additives, and part of the cosolvent in sequence, stirring until fully mixed. Then adjust the pH to 7.5-8.5 with a pH adjuster to obtain mixture A.

[0049] S3: In a separate stirred tank, add the crosslinking agent aqueous isocyanate and the remaining cosolvent, and stir until fully mixed to obtain mixture B;

[0050] S4: Before use, mix mixture A and mixture B thoroughly to obtain the silver functional coating with high infrared transmittance.

[0051] The fourth aspect of the present invention provides an application of the silver functional coating with high infrared transmittance described in the first aspect of the present invention, specifically by coating it on a transparent substrate, the transparent substrate including but not limited to glass, polycarbonate, and polystyrene.

[0052] In some embodiments of the present invention, the coating is applied by spraying, the drying temperature is preferably 80-150℃, and the dry film thickness is preferably 10-25μm.

[0053] In some embodiments of the present invention, the applications include fields such as autonomous vehicles, smart homes, and security industries that have infrared-enabled devices.

[0054] Beneficial effects of the present invention

[0055] This invention addresses the shortcomings of existing technologies by providing a silver functional coating with high infrared transmittance. It uses silver-colored inorganic oxide flake pigments and combines them with a suitable resin and additive formulation system. The resulting functional coating has a silver appearance while possessing high infrared transmittance, exhibiting excellent transmittance performance in the near-infrared, mid-infrared, and far-infrared ranges. It can be widely used on commonly used transparent materials such as glass and polycarbonate, achieving high adhesion, high weather resistance, and easy application. Detailed Implementation

[0056] To more clearly illustrate the present invention, the following detailed description, in conjunction with specific 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. Unless otherwise specified, the experimental methods used in the following embodiments and comparative examples are conventional methods, and the raw materials and reagents used are products that can be purchased from conventional commercial channels.

[0057] The above technical solution will be described below with reference to specific embodiments.

[0058] Examples 1-6: Silver functional coatings with high infrared transmittance 1-6

[0059] Silver functional coatings with high infrared transmittance 1-6 were prepared according to the formulations shown in Table 1 below, and the preparation steps are as follows.

[0060] S1: Add deionized water, dispersant, and silver inorganic flake pigment to a mixing tank and stir at 100-300 r / min for 30 min;

[0061] S2: While stirring, continue to add the water-based resin, crosslinking agent, rheology modifier, remaining other additives, and cosolvent in sequence, and stir until fully mixed;

[0062] S3: Adjust the pH to 7.5-8.5 using a pH adjuster to obtain the silver functional coating 1-6 with high infrared transmittance.

[0063] Table 1 Formulations of Examples 1-6

[0064]

[0065]

[0066] Comparative Examples 1-3: Coatings 1-3 used as comparative examples

[0067] Coatings 1-3, used as comparative examples, were prepared according to the formulations shown in Table 2 below, and the preparation steps are described below.

[0068] S1: Add deionized water, dispersant, and aluminum pigment to a mixing tank and stir at 100-300 r / min for 30 min;

[0069] S2: While stirring, continue to add the water-based resin, crosslinking agent, rheology modifier, remaining other additives, and cosolvent in sequence, and stir until fully mixed;

[0070] S3: Adjust the pH to 7.5-8.5 using a pH adjuster to obtain coatings 1-3 as comparative examples.

[0071] Table 2 Formulations of Comparative Examples 1-3

[0072]

[0073] It should be noted that none of the comparative examples 1-3 contain the silver flake-like inorganic pigment described in this invention; instead, they are replaced with aluminum pigments of varying amounts. Therefore, none of them are within the scope of protection of this invention.

[0074] The coatings obtained in Examples 1-6 and Comparative Examples 1-3 were sprayed for infrared transmittance testing. The substrate used for spraying was transparent quartz glass (60mm*60mm*2mm, infrared transmittance >90%). Baking conditions were 140℃ for 30 minutes, resulting in samples with a dry film thickness of approximately 20μm. After 24 hours, optical properties were measured using a HITACHI U4100 UV-Vis-NIR spectrometer and a BYK-MAC analyzer. The test results are shown in Table 4.

[0075] Examples 7-8: Silver functional coatings with high infrared transmittance 7-8

[0076] Silver functional coatings with high infrared transmittance 7-8 were prepared according to the formulations shown in Table 3 below, and the preparation steps are as follows.

[0077] S1: Add deionized water, dispersant, and silver inorganic flake pigment to a mixing tank and stir at 100-300 r / min for 30 min;

[0078] S2: While maintaining stirring, continue to add the aqueous resin, rheology modifier, remaining other additives, and part of the cosolvent in sequence, stirring until fully mixed. Then adjust the pH to 7.5-8.5 with a pH adjuster to obtain mixture A.

[0079] S3: In a separate stirred tank, add the crosslinking agent aqueous isocyanate and the remaining cosolvent, and stir until fully mixed to obtain mixture B;

[0080] S4: Before use, mix mixture A and mixture B thoroughly to obtain the silver functional coating with high infrared transmittance 7-8.

[0081] Table 3 Formulations of Examples 7-8

[0082]

[0083]

[0084] The coatings obtained in Examples 7-8 were sprayed separately for infrared transmittance testing. The substrate used for spraying was transparent polycarbonate, and the baking conditions were 80°C for 40 minutes to obtain samples with a dry film thickness of approximately 20 μm. After standing for 24 hours, samples were tested using a HITACHIU 4100 UV-Vis-NIR spectrometer, and optical properties were measured using a BYK-MAC analyzer. The test results are shown in Table 4.

[0085] Table 4. Infrared transmittance test results of Examples 1-8 and Comparative Examples 1-3

[0086]

[0087] As shown in Table 4, the solutions described in Examples 1-6 all achieved a significant improvement in transmittance, with the highest transmittance exceeding 80%. In contrast, the solutions described in Comparative Examples 1-3 had extremely low transmittance for infrared waves, only about 1-2%. Devices using this coating must avoid infrared sensors, which limits the design of the silver appearance. Generally, improving near-infrared transmittance is difficult, especially at 905nm. The functional coating described in this invention achieves a good silver appearance while possessing high infrared transmittance.

[0088] Examples 7-8 mainly demonstrate implementation methods for substrates that cannot be heated at high temperatures and require low-temperature curing. It can be seen that the functional coating described in this invention also exhibits a good silver appearance and high infrared transmittance. It should be noted that because polycarbonate has strong absorption at 2.5 μm, this material cannot achieve infrared transmission in this wavelength band, which is unrelated to the coating.

[0089] The coatings obtained in Examples 1-8 and Comparative Examples 1-3 were further functionally tested, and the results are shown in Table 5.

[0090] Table 5 Functional test results of Examples 1-8 and Comparative Examples 1-3

[0091] Sample Model L15° FI Coverage μm G Adhesion Comparative Example 1 151.6 17.9 7.7 5.4 Level 0 Comparative Example 2 148.4 17.3 5.8 5.3 Level 0 Comparative Example 3 148.7 17.8 3.7 5.9 Level 0 Example 1 125.8 13.2 26.6 5.0 Level 0 Example 2 125.3 12.8 18.3 5.1 Level 0 Example 3 126.3 12.9 9.7 4.9 Level 0 Example 4 143.9 16.7 19.8 4.5 Level 0 Example 5 144.2 16.9 16.3 4.7 Level 0 Example 6 133.4 15.7 >50 5.1 Level 0 Example 7 127.3 12.2 18.5 4.8 Level 0 Example 8 138.5 14.8 21.3 5.7 Level 0

[0092] As shown in Table 5, the basic properties of the functional coating described in this invention are basically the same as those of the aluminum pigment, and it also has good angle-dependent color brightness (FI), good shimmer (G), and good hiding power and adhesion.

[0093] 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. A silver functional coating with high infrared transmittance, comprising, by weight percentage:

2. The high infrared transmittance silver functional coating according to claim 1, characterized in that, The silver flake-like inorganic pigment has a multi-layered flake structure; the multi-layered flake structure includes an inner layer structure and an outer layer structure. The components of the inner layer structure include, but are not limited to, synthetic mica flakes, natural mica flakes, alumina flakes, and glass flakes. The components of the outer layer structure include, but are not limited to, magnesium aluminum oxide, fluorine oxide, titanium iron oxide, iron oxide, and titanium dioxide. The refractive index of the outer layer structure is greater than that of the inner layer structure. Preferably, the D50 of the silver flake-like inorganic pigment is in the range of 5-50 μm, the average thickness is 100-1000 nm, the refractive index of the inner layer structure is less than 1.8, and the refractive index of the outer layer structure is greater than 1.

8.

3. The high infrared transmittance silver functional coating according to claim 1, characterized in that, The waterborne resin includes, but is not limited to, one or more of waterborne acrylic resin and waterborne polyurethane resin; the solid content of the waterborne acrylic resin is preferably 20-50%, and the hydroxyl content is preferably 1-5%; the waterborne polyurethane resin is selected from one or more of waterborne polyurethane dispersion, acrylic modified polyurethane dispersion, aliphatic modified polyurethane dispersion, and polyester modified polyurethane dispersion; preferably, the waterborne polyurethane resin does not contain hydroxyl groups, has a solid content of 20-50%, a glass transition temperature (Tg) < 0℃, and a minimum film-forming temperature (MFTT) < 5℃.

4. The silver functional coating with high infrared transmittance according to claim 1, characterized in that, The rheology modifier is selected from one or a combination of organic and inorganic rheology modifiers; the organic rheology modifier includes, but is not limited to, one or more of polyamide wax, EVA wax, polyolefin wax, and polyurethane thickener; the inorganic rheology modifier includes, but is not limited to, one or more of silicate substances, bentonite, and silica; the other modifiers are selected from one or more of wetting and leveling agents, defoamers, and dispersants; the cosolvent includes deionized water and a film-forming solvent added at no more than 10%; the film-forming solvent is selected from one or more of isooctanol, 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 acetate, ethylene glycol ethyl ether, diethylene glycol ethyl ether, and dodecyl alcohol ester; the pH adjuster is a 10% dimethylethanolamine solution.

5. The high infrared transmittance silver functional coating according to any one of claims 1-4, characterized in that, The crosslinking agent is an aqueous amino resin; the aqueous amino resin is selected from one or more of aqueous high imino amino resin, high alkylated amino resin, and partially alkylated amino resin, and the solid content is preferably 70-100%.

6. The high infrared transmittance silver functional coating according to any one of claims 1-4, characterized in that, The crosslinking agent is an aqueous isocyanate; the aqueous isocyanate is preferably an aqueous isocyanate without benzene rings, the solid content is preferably 40-80%, the viscosity is preferably 100-500 mPa·s, and the NCO content is preferably 5-12%; more preferably, the aqueous isocyanate is an aqueous hexamethylene diisocyanate.

7. A method for preparing a silver functional coating with high infrared transmittance as described in claim 5, characterized in that, Includes the following steps: S1: Add deionized water, some other additives, and silver inorganic flake pigment to a mixing tank and stir at 100-300 r / min for 30 min; S2: While stirring, continue to add the water-based resin, crosslinking agent, rheology modifier, remaining other additives, and cosolvent in sequence, and stir until fully mixed; S3: Adjust the pH to 7.5-8.5 using a pH adjuster to obtain the silver functional coating with high infrared transmittance.

8. A method for preparing a silver functional coating with high infrared transmittance as described in claim 6, characterized in that, Includes the following steps: S1: Add deionized water, some other additives, and silver inorganic flake pigment to a mixing tank and stir at 100-300 r / min for 30 min; S2: While maintaining stirring, continue to add the aqueous resin, rheology modifier, remaining other additives, and part of the cosolvent in sequence, stirring until fully mixed. Then adjust the pH to 7.5-8.5 with a pH adjuster to obtain mixture A. S3: In a separate stirred tank, add the crosslinking agent and the remaining cosolvent, and stir until fully mixed to obtain mixture B; S4: Before use, mix mixture A and mixture B thoroughly to obtain the silver functional coating with high infrared transmittance.

9. An application of a silver functional coating with high infrared transmittance as described in claims 1-6, characterized in that, The high infrared transmittance silver functional coating is applied to a transparent substrate, which includes, but is not limited to, glass, polycarbonate, and polystyrene. Preferably, the coating is applied by spraying, with a drying temperature of 80-150℃ and a dry film thickness of 10-25μm.

10. The application of the high infrared transmittance silver functional coating according to claim 9, characterized in that, This includes applications in autonomous vehicles, smart homes, and the security industry.

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