Water-repellent coating composition and water-repellent substrate coated therewith

Abstract

The present invention provides a water-repellent coating composition that has improved adhesion to substrates and durability, particularly for plastic substrates with low surface energy. The water-repellent coating composition includes a specific silane compound and, as an adhesion-improving additive, phosphoric acid or a phosphoric acid-based compound. The silane compound includes a fluorine-based silane compound, a hydrocarbon-based silane compound, or a mixture thereof, such as trifluoromethyltrimethoxysilane.

Description

[Technical field]

[0001] The present invention relates to a water-repellent coating composition, and more particularly to a water-repellent coating composition containing phosphoric acid or a phosphoric acid-based compound and having improved adhesion and durability. [Background technology]

[0002] The following description merely provides background information related to the present invention and is not intended to constitute prior art.

[0003] Recently, portable electronic products and display products such as smartphones, tablets, and laptops are tending to switch from glass and tempered glass substrates to plastic substrates to solve problems of product weight reduction and shatterproofing. However, plastic substrates have been used very little in actual products so far due to their disadvantages of inferior mechanical strength, durability, resistance to scratches, and optical properties compared to glass.

[0004] In order to overcome these shortcomings of plastic substrates, research is actively underway to supplement mechanical strength and durability with a hard coating layer, and to impart functions such as hydrophilic and water repellency, flame resistance, antifouling, anti-reflection, optical filtering, and adjustment of reflectance and absorptance to the surface through additional functional coatings, thereby making not only mechanical properties but also optical and sensory properties similar to those of glass products.

[0005] In particular, functional coatings with water repellency properties not only repel water, but also provide anti-fouling, easy-clean and anti-fingerprint properties against various contaminants, making them one of the most commonly used functional coating technologies for the outermost surfaces.

[0006] However, while it is easy to apply functional coatings with water repellency to glass, which has a high surface energy, plastic substrates, which have a relatively low surface energy, have durability problems due to a decrease in adhesion to the substrate, making it difficult to apply functional coatings to plastic substrates. Summary of the Invention [Problem to be solved by the invention]

[0007] In order to solve the above-mentioned problems of the conventional art, the present invention aims to provide a water-repellent coating composition that contains phosphoric acid or a phosphoric acid-based compound and has improved adhesion and durability.

[0008] Another object of the present invention is to provide a water-repellent coated substrate comprising a water-repellent coating layer formed from the composition, and an article comprising the water-repellent coated substrate. [Means for solving the problem]

[0009] In order to achieve the above object, the present invention provides a water-repellent coating composition, which comprises a coating composition, a solvent, and an adhesion enhancing additive.

[0010] The present invention also provides a water-repellent coated substrate having a coating layer of the water-repellent coating composition formed on one surface or the other surface of the substrate.

[0011] The present invention also provides an article comprising the water-repellent coated substrate. Effect of the Invention

[0012] The water-repellent coating composition according to the present invention contains phosphoric acid or a phosphoric acid-based compound, and forms stronger bonds through secondary bonds (Vander Waals bonds and hydrogen bonds) even with plastic substrates without surface treatment, so that a water-repellent coating substrate with excellent durability can be provided even with a simple wet coating, and large-area coating is possible with low process costs.

[0013] Therefore, the composition of the present invention can be widely applied not only to displays of electronic products such as smartphones, tablet PCs, LCD monitors, and interior / exterior advertising displays, but also to protective films for mobile phones, interior and exterior materials for automobiles, the interior and exterior appearance of home appliances, paints, and protective layers for various industrial products. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a diagram showing that the water-repellent coating layer according to the present invention is firmly bonded by secondary bonding. [Diagram 2] 1 is a schematic diagram of a water-repellent coated substrate according to an embodiment of the present invention; [Diagram 3] 1 is a schematic diagram of a water-repellent coated substrate according to an embodiment of the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings, in which: FIG. 1 is a block diagram of a semiconductor device according to an embodiment of the present invention;

[0016] Throughout the specification, when a part is said to "comprise" a certain element, this means that it can further include other elements, but not to the exclusion of other elements, unless specifically stated to the contrary.

[0017] The water-repellent coating composition of the present invention is characterized by comprising a coating composition, a solvent, and an adhesion enhancing additive. In the present invention, the coating composition may include a silane compound represented by the following Chemical Formula 1: [ka] In the above formula, X1, X2, X3, X4, and X5 are each independently ABCDEFG; A is (CH2) a where a has a value from 0 to 20; B is (CF2) b where b has a value between 0 and 20; C is (OCH2) c1 -(OC2H4) c2 -(OC3H6) c3 -(OC4H8) c4 wherein c1, c2, c3, and c4 each independently have a value of 0 to 20; D is (OCF2) d1 -(OC2F4) d2 -(OC3F6) d3 -(OC4F8) d4 wherein d1, d2, d3, and d4 each independently have a value of 0 to 20; E is directly linked or [ka] and F is directly linked or [ka] and G is either directly linked or [ka] It is one of the R1 is one of an alkyl group, a chloro group, an alkoxy group, and a hydroxy group; R2 is H or F.

[0018] In the present invention, the silane compound may include a fluorine silane compound, a hydrocarbon silane compound, or a mixture thereof. Specifically, trifluoromethyl trimethoxysilane, trifluoromethyl triethoxysilane, trifluoropropyl trimethoxysilane, trifluoropropyl triethoxysilane, nonafluorobutyl ethyl trimethoxysilane, nonafluorobutyl ethyl triethoxysilane, nonafluorohexyl trimethoxysilane, nonafluorohexyl triethoxysilane, heptadecafluorodecyl trimethoxysilane, heptadecafluorodecyl triethoxysilane, heptadecafluorodecyl triisopropylsilane, 3-trimethoxysilylpropyl pentadecafluorooctate, 3-triethoxysilylpropyl pentadecafluorooctate, 3-trimethoxy ... perfluorooctylamide, 3-triethoxysilylpropyl pentadecafluorooctylamide, 2-trimethoxysilylethyl pentadecafluorodecyl sulfide, 2-triethoxysilylethyl pentadecafluorodecyl sulfide, pentafluorophenyl trimethoxysilane, pentafluorophenyl triethoxysilane, 4-(perfluorotolyl)trimethoxysilane, 4-(perfluorotolyl)triethoxysilane, dimethoxybis(pentafluorophenyl)silane, diethoxybis(4-pentafluorotolyl)silane, or trialkoxysilanes having a hydrocarbon having 1 to 18 carbon atoms and their isomers, derivatives, and polymers, trimethoxyphenylsilane, trimethoxy(2-phenylethyl)silane, (triethoxysilyl)cyclohexane, and their derivatives and polymers.

[0019] The solvent that can be used in the present invention is not particularly limited as long as it has solubility and does not affect the reaction, and specifically, it may be an organic solvent or a fluorine-based solvent, and more specifically, it may be one or more solvents selected from the group consisting of 1,3-bistrifluoromethylbenzene, ethyl nonafluorobutyl ether, ethyl nonafluoroisobutyl ether, perfluorobutyl ethyl ether, perfluorohexyl methyl ether, perfluorocarbons, hydrofluoroethers, and derivatives thereof.

[0020] The water repellent coating composition of the present invention can be wet coated using the solvent, and therefore can be used in a versatile manner without a separate dry coating device, thereby reducing the process cost.

[0021] In the present invention, the adhesion enhancing additive functions to improve adhesion by combining with a silane compound to form a Van der Wals bond or a hydrogen bond with the substrate and inducing a bond between the substrate and the silane compound.

[0022] The adhesion enhancing additive may include phosphoric acid or a phosphoric acid-based compound, and more specifically, phosphoric acid, trimethyl phosphate, triethyl phosphate, etc. When phosphoric acid or a phosphoric acid-based compound is used, some of the reactive groups induce covalent bonds with the silane compound and other reactive groups induce strong secondary bonds with the substrate, thereby forming a water-repellent coating layer with improved adhesion and durability of the thin film.

[0023] Referring to FIG. 1, the water-repellent coating layer according to the present invention forms secondary bonds, such as van der Waals bonds or hydrogen bonds, on the surface of the substrate, improving adhesion to the substrate.

[0024] According to an embodiment of the present invention, the adhesion improving additive may be included in an amount of 3 parts by weight to 100 parts by weight, specifically, 5 parts by weight to 30 parts by weight, based on 100 parts by weight of the coating composition. When the content of the adhesion improving additive satisfies the above range, the adhesion between the substrate and the coating composition is excellent, and the silane compound can be uniformly distributed.

[0025] The viscosity of the water-repellent coating composition according to one embodiment of the present invention may be adjusted with a solvent depending on the purpose of use, and may have a viscosity of, for example, 0.1 cP to 500 cP so that wet coating is possible, and specifically, may have a viscosity of 0.1 cP to 80 cP.

[0026] The water-repellent coating composition of the present invention may further contain one or more additives such as an antioxidant and a leveling agent, if necessary.

[0027] The additives include polyether-modified polydimethylsiloxanes (e.g., BYK's BYK-300, BYK-301, BYK-302, BYK-331, BYK-335, BYK-306, BYK-330, BYK-341, BYK-344, BYK-307, BYK-333, BYK-310, etc.), polyether-hydroxyfunctional poly-dimethyl-siloxanes (e.g., BYK-308, BYK-373, etc.), polymethylalkylsiloxanes (e.g., BYK-077, BYK-085, etc.), polyether-polymethylalkylsiloxanes (e.g., Polyether-modified methylalkylpolysiloxane, e.g., BYK-320, BYK-325, etc.), polyester polymethylalkylsiloxane (Polyester modified poly-methyl-alkyl-siloxane, e.g., BYK-315, etc.), aralkyl polymethylalkylsiloxane (Aralkyl modified methylalkyl polysiloxane, e.g., BYK-322, BYK-323, etc.), polyester hydroxy polydimethylsiloxane (Polyester modified hydroxy functional polydimethylsiloxane, e.g., BYK-370, etc.), polyester acrylic polydimethylsiloxane (Acrylic functional polyester modified polydimethylsiloxane, e.g., BYK-371, BYK-UV3570, etc.), polyether-polyester hydroxy polydimethylsiloxane (Polyeherpolyester modified hydroxy functional polydimethylsiloxane, e.g., BYK-375, etc.), polyether polydimethylsiloxane (Polyether modifieddimethylpolysiloxane, e.g. BYK-345, BYK-348, BYK-346, BYK-UV3510, BYK-332, BYK-337, etc.; Non-ionic acrylic copolymer, e.g. BYK-380, etc.; Ionic acrylic copolymer, e.g. BYK-381, etc.; Polyacrylate, e.g. BYK-353, BYK-356, BYK-354, BYK-355, BYK-359, BYK-361 N, BYK-357, BYK-358 N, BYK-352, etc.; Polymethacrylate, e.g. BYK-390, etc.; Polyether modified acrylic functional Examples of such a surfactant include polydimethylsiloxane (e.g., BYK-UV3500, BYK-UV3530, etc.), polyether modified siloxane (e.g., BYK-347, etc.), alcohol alkoxylates (e.g., BYK-DYNWET 800, etc.), acrylates (e.g., BYK-392, etc.), and hydroxysilicone polyacrylates (Silicone modified polyacrylate (OH-functional), e.g., BYK-Silclean3700, etc.).

[0028] The present invention also provides a water-repellent coated substrate having a coating layer of a water-repellent coating composition composed of the phosphoric acid or a phosphoric acid-based compound formed on one or the other surface of the substrate.

[0029] 2 and 3 are schematic diagrams of a water-repellent coated substrate having a water-repellent coating layer formed thereon according to an embodiment of the present invention.

[0030] Referring to FIG. 2, the water-repellent coated substrate 100 of the present invention may have a water-repellent coating layer 102 formed by coating the water-repellent coating composition on a surface of a substrate 101, and referring to FIG. 3, the substrate may include a substrate 101, a hard coating layer 103 formed on the surface of the substrate, and a water-repellent coating layer 102 formed on the surface of the hard coating layer 103.

[0031] In the present invention, the substrate 101 is not particularly limited, and specific examples thereof may be selected from plastic films known in the art. If necessary, a transparent or semi-transparent film may be appropriately selected and used depending on the application. For example, polyester films such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate, polyethylene films, polypropylene films, cellophane, diacetyl cellulose films, triacetyl cellulose films, acetyl cellulose butyrate films, polyvinyl chloride films, polyvinylidene chloride films, polyvinyl alcohol films, ethylene-vinyl acetate copolymer films, polystyrene films, polycarbonate films, polymethyl methacrylate films, polymethylpentene films, polysulfone films, polyether ether ketone films, polyether sulfone films, polyether imide films, polyimide films, fluororesin films, polyamide films, acrylic resin films, norbornene-based resin films, and cycloolefin resin films may be used, and may also be applied to glass substrates.

[0032] The hard coating layer 103 may be formed by coating a known hard coating composition on the substrate 101, and the thickness may be adjusted as desired, and the thickness of the hard coating layer 103 in the water-repellent coated substrate 100 of the present invention may be adjusted to 2 to 60 μm, more specifically, 10 to 30 μm. When the thickness of the hard coating layer is within the above range, the durability of the water-repellent coated substrate 100 may be ensured without impairing other physical properties of the substrate.

[0033] The water-repellent coating layer 102 according to the present invention can be prepared by coating a water-repellent coating composition containing an adhesion enhancing additive onto the surface of the substrate 101 or the hard coating layer 103 and curing the composition.

[0034] In the present invention, the adhesion enhancing additive may include phosphoric acid or a phosphoric acid-based compound, and thus the adhesion between the water-repellent coating layer 102 and the substrate 101 or hard coating layer 103 can be increased and wear resistance and durability can be improved even with a simple coating process without complicated processes.

[0035] The water-repellent coating composition can be applied to the substrate 101 or the hard coating layer 103 by any one of methods selected from spraying, dip coating, spin coating, die coating, comma coating, screen coating, inkjet printing, pad printing, knife coating, kiss coating, bar coating, and gravure coating.

[0036] The water-repellent coating layer 102 of the present invention has excellent adhesion, and the change in haze value before and after a scratch resistance test, for example, a scratch resistance test based on ISO 14782, can be less than 0.1%, specifically, can be controlled to less than 0.05%.

[0037] In addition, the water-repellent coating layer 102 according to the present invention has excellent adhesion, and the change in DI contact angle before and after an abrasion resistance test, for example, an abrasion resistance test based on KS B ISO 9211-4, may be 5° or less, specifically 3° or less.

[0038] The water-repellent coated substrate 100 according to the present invention has excellent durability against water repellency, and the change in DI contact angle before and after a salt spray test based on JIS K 5400 can be within 5°, specifically within 3°.

[0039] In addition, the water-repellent coated substrate 100 according to the present invention has excellent durability against water repellency, and the change in DI contact angle before and after a high temperature and high humidity test based on JIS C 7021 can be within 5°, specifically within 3°.

[0040] The water-repellent coating composition according to the present invention contains phosphoric acid or a phosphoric acid-based compound, and forms stronger bonds through secondary bonds (Vander Waals bonds and hydrogen bonds) even on plastic substrates without surface treatment, so that a water-repellent coating substrate with excellent durability can be provided even with a simple wet coating, and large-area coating is possible with low process costs.

[0041] Therefore, the composition of the present invention can be widely applied not only to displays of electronic products such as smartphones, tablet PCs, LCD monitors, and interior / exterior advertising displays, but also to protective films for mobile phones, interior and exterior materials for automobiles, the interior and exterior appearance of home appliances, paints, and protective layers for various industrial products.

[0042] Hereinafter, specific examples will be presented to aid in understanding the present invention. However, the following examples are merely illustrative of the present invention, and the scope of the present invention is not limited to the following examples.

[0043] (Production example) 0.2 g of fluorine-based silane (DAIKIN, OPTOOL UD509), 50 g of fluorine-based solvent (3M, Novec-7200), 2 g of ethanol (Burdick & Jackson), and 0.05 g of phosphoric acid (Shinetsu, D-220) were mixed and stirred for 10 minutes to prepare a water-repellent coating composition.

[0044] (Comparative manufacturing example) A water-repellent coating composition was prepared in the same manner as in the above Preparation Example, except that phosphoric acid (D-220, manufactured by Shinetsu) was not included.

[0045] Example 1 The water-repellent coating composition of the Preparation Example was flow-coated onto a PET (SKC, 250 μm) substrate, and then heat-cured in an oven at 85° C. for 30 minutes to form a water-repellent coating layer.

[0046] Example 2 A water-repellent coating layer was formed in the same manner as in Example 1, except that an LCD glass (100 mm x 100 mm, thickness 0.5T (500 μm)) was used as the substrate.

[0047] Example 3 A water-repellent coating layer was formed in the same manner as in Example 1, except that a hard coating / PC (manufactured by Dongjin Semichem, 680 μm) was used as the substrate.

[0048] Example 4 The water-repellent coating layer was formed in the same manner as in Example 3, except that the curing was performed at room temperature for 30 minutes.

[0049] Example 5 A water-repellent coating layer was formed in the same manner as in Example 3, except that the coating composition was spray-coated.

[0050] (Comparative Example 1-1) A water-repellent coating layer was formed in the same manner as in Example 1, except that a comparative composition not containing phosphoric acid (D-220, manufactured by Shinetsu) was used.

[0051] (Comparative Example 1-2) No water-repellent coating layer was formed on the PET (SKC Corporation, 250 μm) substrate used in Example 1 and Comparative Example 1-1.

[0052] (Comparative Example 2-1) A water-repellent coating layer was formed in the same manner as in Example 2, except that a comparative composition not containing phosphoric acid (D-220, manufactured by Shinetsu) was used.

[0053] (Comparative Example 2-2) No water-repellent coating layer was formed on the LCD glass (100 mm×100 mm, thickness 0.5T (500 μm)) used in Example 2 and Comparative Example 2-1.

[0054] (Comparative Example 3-1) A water-repellent coating layer was formed in the same manner as in Example 3, except that a comparative composition not containing phosphoric acid (D-220, manufactured by Shinetsu) was used.

[0055] (Comparative Example 3-2) The hard coating / PC (manufactured by Dongjin Semichem, 680 μm) used in Example 3 and Comparative Example 3-1 did not have a water-repellent coating layer formed thereon.

[0056] Comparative Example 4 A water-repellent coating layer was formed in the same manner as in Example 4, except that a comparative composition not containing phosphoric acid (D-220, manufactured by Shinetsu) was used.

[0057] Comparative Example 5 A water-repellent coating layer was formed in the same manner as in Example 5, except that a comparative composition not containing phosphoric acid (D-220, manufactured by Shinetsu) was used.

[0058] (Test Example 1) The physical properties of the water-repellent coating layers of Examples 1 and 2 and Comparative Examples 1-1, 1-2, 2-1, and 2-2 before and after coating with a substrate were compared, and the results are shown in Table 1 below.

[0059] The physical properties were measured by the following methods. - Surface hardness: Based on JIS 5600-5-4, the load was 1kgf, which is the most severe condition. The pencil used was made by Mitsubishi, and the lead was 1 The test was carried out five times for each pen hardness, and if two or more scratches were observed, the test was judged to be defective. -Transmittance and Haze: Measured using COH-400 (manufactured by Nippon Denshoku Co., Ltd.) based on ISO 14782. Measurements were made five times per sample, and the average values ​​were recorded. - Eraser abrasion resistance test: Conducted based on KS B ISO 9211-4. At this time, an eraser specially designed for abrasion resistance tests was used, and the contact angle value of the substrate surface before and after 1500 reciprocations with a load of 500gf was recorded. -Scratch resistance test: Based on JIS K 5600-5-9, it was carried out using #0000 steel wool with a load of 1 kgf. At this time, the number of reciprocating strokes was 10,000, which is the more severe condition, and the haze values ​​of the front and back substrates were recorded. - Salt spray test: Conducted for 72 hours at 35℃ and 5% salt water concentration based on JIS K 5400. To confirm the durability of the functional coating film against salt water, the contact angle of the substrate surface before and after the test was measured and recorded. -High temperature and humidity test: Conducted for 120 hours in an environment of 85℃ temperature and 85% humidity based on JIS C 7021. To confirm the durability of the functional coating film in a high temperature and humidity environment, the contact angle value of the substrate surface before and after the test was measured and recorded. [Table 1]

[0060] As shown in Table 1, the water-repellent coating layers of Examples 1 and 2 according to the present invention, which contain a phosphate-based compound, showed excellent results in terms of surface hardness, transmittance, scratch resistance, abrasion resistance, etc., regardless of the type of substrate, and were confirmed to improve adhesion regardless of the substrate. In particular, the DI contact angle was changed to 2° or less in the salt spray test and high temperature and humidity test, confirming high reliability.

[0061] Test Example 2 The physical properties of the water-repellent coating layers of Examples 3 and 4 and Comparative Examples 3-1, 3-2, and 4 before and after coating were compared according to the curing temperature. The results are shown in Table 2 below. [Table 2]

[0062] As shown in Table 2, the water-repellent coating layers of Examples 3 and 4 according to the present invention, which contain a phosphate-based compound, showed excellent results in terms of surface hardness, transmittance, scratch resistance, abrasion resistance, etc., regardless of the curing temperature, and were confirmed to improve adhesion regardless of the curing temperature. In particular, the DI contact angle was changed to 2° or less in the salt spray test and high temperature and humidity test, confirming high reliability.

[0063] (Test Example 3) The physical properties of the water-repellent coating layers of Examples 3 and 5 and Comparative Examples 3-1, 3-2, and 5 before and after coating were compared depending on the coating method, and the results are shown in Table 3 below. [Table 3]

[0064] As shown in Table 3, the water-repellent coating layers of Examples 3 and 5 according to the present invention, which contain a phosphate-based compound, showed excellent results in terms of surface hardness, transmittance, scratch resistance, abrasion resistance, etc., regardless of the coating method, and were confirmed to improve adhesion regardless of the coating method. In particular, the DI contact angle was changed to 2° or less in the salt spray test and high temperature and humidity test, confirming high reliability.

Claims

1. A coating composition comprising a silane compound; A solvent; and 1. A water repellent coating composition comprising an adhesion enhancing additive, comprising: The silane compounds include trifluoromethyltrimethoxysilane, trifluoromethyltriethoxysilane, trifluoropropyltrimethoxysilane, trifluoropropyltriethoxysilane, nonafluorobutylethyltrimethoxysilane, nonafluorobutylethyltriethoxysilane, nonafluorohexyltrimethoxysilane, nonafluorohexyltriethoxysilane, heptadecafluorodecyltrimethoxysilane, heptadecafluorodecyltriethoxysilane, heptadecafluorodecyltriisopropylsilane, 3-trimethoxysilylpropylpentadecafluorooctate, 3-triethoxysilylpropylpentadecafluorooctate, 3-trimethoxysilyl at least one selected from the group consisting of propyl pentadecafluorooctylamide; 3-triethoxysilylpropyl pentadecafluorooctylamide; 2-trimethoxysilylethyl pentadecafluorodecyl sulfide; 2-triethoxysilylethyl pentadecafluorodecyl sulfide; pentafluorophenyl trimethoxysilane; pentafluorophenyl triethoxysilane; 4-(perfluorotolyl)trimethoxysilane; 4-(perfluorotolyl)triethoxysilane; dimethoxybis(pentafluorophenyl)silane; diethoxybis(4-pentafluorotolyl)silane; and isomers thereof (excluding condensates thereof) and derivatives thereof (excluding condensates thereof), The water-repellent coating composition, wherein the adhesion-improving additive comprises phosphoric acid, trimethyl phosphate, or triethyl phosphate, and the solvent comprises a fluorinated solvent.

2. The water-repellent coating composition according to claim 1, wherein the adhesion improving additive is present in an amount of 3 to 100 parts by weight based on 100 parts by weight of the coating composition.

3. The water-repellent coating composition according to claim 1, wherein the solvent is at least one selected from the group consisting of 1,3-bistrifluoromethylbenzene, ethyl nonafluorobutyl ether, ethyl nonafluoroisobutyl ether, perfluorobutyl ethyl ether, perfluorohexyl methyl ether, perfluorocarbons, hydrofluoroethers, and derivatives thereof.

4. The water-repellent coating composition according to claim 1, wherein the water-repellent coating composition has a viscosity of 0.1 cP to 500 cP.

5. The water-repellent coating composition according to claim 1 , wherein the coating composition further comprises one or more additives selected from the group consisting of antioxidants and leveling agents.

6. A water-repellent coated substrate, comprising a coating layer of the water-repellent coating composition according to claim 1, which is composed of phosphoric acid, trimethyl phosphate, or triethyl phosphate, formed on one surface or the other surface of the substrate.

7. 7. The water-repellent coated substrate according to claim 6, wherein the coating layer has a haze value change of 0.1% or less before and after a scratch resistance test based on ISO 14782.

8. 7. The water-repellent coated substrate according to claim 6, wherein the coating layer exhibits a change in DI contact angle of 5° or less before and after an abrasion resistance test based on KS B ISO 9211-4.

9. 7. The water-repellent coated substrate according to claim 6, wherein the change in DI contact angle before and after a salt spray test based on JIS K 5400 is within 5°.

10. 7. The water-repellent coated substrate according to claim 6, wherein the change in DI contact angle before and after a high-temperature, high-humidity test based on JIS C 7021 is within 5°.

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