Paint set, coated article, and coating method

Abstract

To provide a paint set, a coated article, and a coating method which exhibit superior self-cleaning properties and allow the formation of a uniform and firm coating film.SOLUTION: The paint set of one embodiment of the invention includes a hydrophobic organic paint, a mixed liquid, and a hydrophilic inorganic paint, the mixed liquid being constituted by mixing a silane coupling agent with a base oil.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a paint set, a painted body, and a painting method used for painting aircraft and the like. [Background technology]

[0002] It is known that hydrophilic coatings made of inorganic materials, which are used for painting aircraft and the like, have an excellent effect of cleaning dirt adhering to the coating surface (self-cleaning) due to their hydrophilic effect (see, for example, Patent Documents 1 and 2). On the other hand, hydrophobic coatings made of organic materials have low affinity for water, so they cannot be expected to have a self-cleaning effect. One method of making a hydrophobic coating hydrophilic is to paint a hydrophilic paint on the hydrophobic coating to make the coating surface hydrophilic. [Prior art documents] [Non-patent literature]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-1684 [Patent Document 2] Japanese Patent Application Laid-Open No. 2009-1685 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when a hydrophilic paint is applied to a hydrophobic coating, the hydrophilic paint is repelled, making it difficult to form a uniform, strong, and adhesive coating surface. This is because the affinity between hydrophobic and hydrophilic paints is low, making it difficult to apply the hydrophilic paint evenly to the surface of the hydrophobic coating and form a uniform coating. Furthermore, the bond between the hydrophobic and hydrophilic coatings is only physical adsorption, so the adhesion between the coatings is poor, making it difficult to form a strong coating surface for the hydrophilic paint.

[0005] In view of the above circumstances, an object of the present invention is to provide a paint set, a coated body, and a coating method that have excellent self-cleaning properties and are capable of forming a uniform and strong coating film. [Means for solving the problem]

[0006] A paint set according to one embodiment of the present invention includes a hydrophobic organic paint, a mixed liquid, and a hydrophilic inorganic paint. The mixed liquid is a mixture of a silane coupling agent and a base oil.

[0007] The base oil may be a poly-alpha-olefin-based base oil or an ester-based base oil.

[0008] The base oil may be hydrogenated poly(1-decene) or a diester of neopentyl glycol and 2-ethylhexane.

[0009] The silane coupling agent may be an isocyanate-based silane coupling agent, an amine-based silane coupling agent, or an epoxy-based silane coupling agent.

[0010] The silane coupling agent includes 3-(triethoxysilyl)propyl isocyanate, 3-aminopropyltriethoxysilane, triethoxy(3-glycidyloxypropyl)silane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 3-glycidoxypropyltriethoxysilane, N-2-(aminoethyl)-3-aminopropylmethyldimethoxysilane, and N-2-(aminoethyl)-3-aminopropyltrimethoxysilane. , 3-aminopropyltrimethoxysilane, 3-triethoxysilyl-N-(1,3-dimethyl-butylidene)propylamine, N-phenyl-3-aminopropyltrimethoxysilane, N-(vinylbenzyl)-2-aminoethyl-3-aminopropyltrimethoxysilane hydrochloride, tris-(trimethoxysilylpropyl)isocyanurate, 3-ureidopropyltrialkoxysilane, 3-mercaptopropylmethyldimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-isocyanatopropyltriethoxysilane, or 3-trimethoxysilylpropylsuccinic anhydride.

[0011] The hydrophilic inorganic coating material may have a silanol group.

[0012] The hydrophilic inorganic coating material may be a mixture of a silicon dioxide compound, a sodium hydrogen phosphate compound, a boric acid compound and water.

[0013] The hydrophobic organic paint may be an acrylic paint, a urethane paint, or an ester paint.

[0014] The hydrophobic organic paint may be a two-component urethane paint.

[0015] A coating method according to one aspect of the present invention includes: A hydrophobic organic paint is applied to the object to be painted to form a first layer, a mixture of a silane coupling agent and a base oil is applied onto the first layer to form a second layer; A hydrophilic inorganic paint is applied onto the second layer to form a third layer.

[0016] In the step of forming the second layer, the base oil may be removed by washing after a chemical reaction occurs between the hydrophobic organic coating material of the first layer and the silane coupling agent.

[0017] A coated body according to one embodiment of the present invention comprises a first layer, a second layer, and a third layer. The first layer is provided on the object to be painted and is made of a hydrophobic organic paint. The second layer is provided on the first layer and includes a silane coupling agent. The third layer is provided on the second layer and is made of a hydrophilic inorganic paint. The silane coupling agent forms a chemical bond with the hydrophobic organic paint, and also forms a chemical bond with the hydrophilic inorganic paint.

[0018] The silane coupling agent may form a siloxane bond with the hydrophilic inorganic coating material.

[0019] The silane coupling agent may form a urethane bond, a urea bond or an amine-epoxy bond between the silane coupling agent and the hydrophobic organic coating material. [Effects of the Invention]

[0020] According to the present invention, it is possible to provide a paint set, a coated body, and a coating method that have an excellent self-cleaning effect and are capable of forming a uniform and strong coating film. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a schematic diagram of a painted body according to an embodiment of the present invention. [Figure 2] 1 is a flowchart of a coating method according to an embodiment of the present invention. [Figure 3] 2 is a schematic diagram of the coating method. FIG. [Figure 4] 2 is a schematic diagram of the coating method. FIG. [Figure 5] 2 is a schematic diagram of a chemical reaction in the coating method. FIG. [Figure 6] 2 is a schematic diagram of a chemical reaction in the coating method. FIG. [Figure 7] 1 is a photograph of a carbon oil test on a hydrophobic organic paint as a comparison to the present invention. [Figure 8] 10 is a photograph of a carbon oil test on a CFRP substrate. [Figure 9] As a comparison with the present invention, this is a photograph showing the cleaning effect on insects attached to a hydrophobic organic paint. [Figure 10] 10 is a photograph showing the cleaning effect of insects attached to a coated body according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0022] A coated body, a paint set, and a coating method according to an embodiment of the present invention will be described.

[0023] [Composition of the painted body] 1 is a schematic diagram of a coated body 100 according to this embodiment. As shown in the figure, the coated body 100 includes an object to be coated 110 and a coating 120.

[0024] The object to be painted 110 is an object to be painted, and has a substrate 111 and a primer 112. The substrate 111 is, for example, the outer panel of an aircraft, but is not particularly limited thereto. The primer 112 is a coating of an undercoat paint formed on the substrate 111. The material of the primer 112 is not particularly limited. Note that the primer 112 does not necessarily have to be provided, and the coating 120 may be formed directly on the substrate 111.

[0025] The coating 120 is formed on the object 110 to be coated. The coating 120 includes a first layer 121, a second layer 122, and a third layer 123.

[0026] The first layer 121 is a coating film of a hydrophobic organic paint formed on the object 110 to be painted, and the hydrophobic organic paint has a hydroxyl group (OH group). Specifically, the hydrophobic organic paint can be an acrylic paint, a urethane paint, or an ester paint, and more specifically, a two-component urethane paint. An example of a two-component urethane paint that can be used is Skyhalo (registered trademark) Top Coat #400 (manufactured by Nippon Tokushu Toryo Co., Ltd.). In addition to this, the first layer 121 may be made of any other hydrophobic organic paint that has a hydroxyl group.

[0027] The second layer 122 is formed on the first layer 121 and is a layer containing a silane coupling agent. Specifically, the second layer 122 is formed by applying a mixed liquid containing the silane coupling agent and a base oil onto the first layer 121, and then removing the base oil. As will be described later, the silane coupling agent chemically bonds with the hydrophobic organic paint of the first layer 121, and also chemically bonds with the hydrophilic inorganic paint of the third layer 123.

[0028] The third layer 123 is a coating of a hydrophilic inorganic paint formed on the second layer 122, and the hydrophilic inorganic paint has silanol groups (Si-OH groups). Specifically, Adtec Coat (manufactured by Trade Services) can be used as the hydrophilic inorganic paint. Adtec Coat is a mixture of a silicon dioxide compound, a sodium hydrogen phosphate compound, a boric acid compound, and water. Alternatively, the third layer 123 may be made of any other hydrophilic inorganic paint having silanol groups. As shown in FIG. 1, the third layer 123 constitutes the surface 100a of the coated body 100.

[0029] [Painting method] The coating method according to this embodiment will now be described. Figure 2 is a flowchart of the coating method according to this embodiment, and Figures 3 and 4 are schematic diagrams showing the coating method. Figures 5 and 6 are schematic diagrams of the chemical reactions in the coating method.

[0030] First, as shown in FIG. 3, a hydrophobic organic paint is applied (St101) to the object 110 to form a first layer 121. As described above, the hydrophobic organic paint contains hydroxyl groups (OH groups). When the hydrophobic organic paint is a two-component urethane paint such as Skyhalo (registered trademark) Top Coat #400, the hydroxyl groups of the polyol react with the isocyanate groups (NCO groups) when the two components are mixed, but some of the hydroxyl groups remain unreacted, resulting in the first layer 121 containing hydroxyl groups. Table 1 below shows the components of components A and B of Skyhalo (registered trademark) Top Coat #400.

[0031] [Table 1]

[0032] Next, the silane coupling agent and base oil are mixed to prepare a mixed liquid (St102). Table 2 below shows silane coupling agents that can be used in this embodiment. Silane coupling agents that have a functional group that reacts with a hydroxyl group, an amino group, or a urethane bond, and an alkoxy group (OR group) can be used. Specifically, as shown in Table 1, 3-(triethoxysilyl)propyl isocyanate can be used as an isocyanate-based agent, 3-aminopropyltriethoxysilane can be used as an amine-based agent, and triethoxy(3-glycidyloxypropyl)silane can be used as an epoxy-based agent. Any one or more of these silane coupling agents can be used. In addition, silane coupling agents that have a functional group that reacts with a hydroxyl group, an amino group, or a urethane bond, and an alkoxy group can be used. The concentration of the silane coupling agent is, for example, 1 vol%.

[0033] [Table 2]

[0034] In addition, the silane coupling agent that can be used in this embodiment is not limited to the above, and examples thereof include 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 3-glycidoxypropyltriethoxysilane, N-2-(aminoethyl)-3-aminopropylmethyldimethoxysilane, N-2-(aminoethyl)-3-aminopropyltrimethoxysilane, 3-aminopropyltrimethoxysilane, 3-trimethyltriethoxy ... The alkylsilyl group may be iethoxysilyl-N-(1,3-dimethyl-butylidene)propylamine, N-phenyl-3-aminopropyltrimethoxysilane, N-(vinylbenzyl)-2-aminoethyl-3-aminopropyltrimethoxysilane hydrochloride, tris-(trimethoxysilylpropyl)isocyanurate, 3-ureidopropyltrialkoxysilane, 3-mercaptopropylmethyldimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-isocyanatopropyltriethoxysilane, or 3-trimethoxysilylpropylsuccinic anhydride.

[0035] Table 3 below shows base oils that can be used in this embodiment. The base oil is an oily substance that does not contribute to the chemical reaction of the silane coupling agent. Specifically, as shown in Table 3, DURASYN (registered trademark) 164 (manufactured by INEOS) can be used as a poly-α-olefin base oil. This is a hydrogenated deca-1-ene homopolymer. Furthermore, Unistar (registered trademark) H208BRS (manufactured by NOF Corporation) can also be used as an ester base oil. This is a neopentyl glycol 2-ethylhexanoic acid diester. In addition to this, oily substances that do not contribute to the chemical reaction of the silane coupling agent can be used as the base oil.

[0036] [Table 3]

[0037] Next, as shown in FIG. 4, the mixed liquid is applied onto the first layer 121 (St103) to form a second layer 122. The mixed liquid can be applied by drop casting, spraying, brush coating, spin coating, or dipping. Drop casting is a coating method in which the mixed liquid is dripped, and spraying is a coating method in which the mixed liquid is sprayed using a spray gun or airbrush. Brush coating is a coating method in which the mixed liquid attached to a brush or roller is transferred. Spin coating is a method in which a coating film is formed by centrifugal force by rotating the object to be coated at high speed, and dipping is a method in which the object to be coated is submerged in a solution.

[0038] After the mixed liquid is applied, it is left to stand for a certain period of time (St104) to allow a chemical reaction between the hydrophobic organic paint of the first layer 121 and the silane coupling agent of the second layer. Specifically, as shown in FIG. 5, the hydroxyl group (OH group) of the hydrophobic organic paint reacts with the functional group of the silane coupling agent, forming a chemical bond between the hydrophobic organic paint and the silane coupling agent. While FIG. 5 shows a case where the functional group of the silane coupling agent is an isocyanate group (NCO group), this functional group may be another group. The standing time is, for example, 3 to 18 hours. Next, the base oil is removed from the second layer 122 (St105). The base oil can be removed by washing with a solvent such as hexane.

[0039] After the mixed solution is applied, silanol groups (Si-OH groups) are formed in the silane coupling agent. The silanol groups are generated by hydrolysis of the alkoxy groups of the silane coupling agent in the presence of moisture. After the base oil is removed (St105), a hydrochloric acid ethanol solution (HCl / EtOH (v / v=1 / 8), concentration: 0.01 mol / L) may be applied to the second layer 122 to promote the generation of silanol groups. A hydrochloric acid methanol solution may also be used instead of the hydrochloric acid ethanol solution.

[0040] Next, a hydrophilic inorganic paint is applied onto the second layer 122 (St106) to form a third layer 123 as shown in FIG. 1. The hydrophilic inorganic paint can be applied by spraying. The hydrophilic inorganic paint has a silanol group (Si-OH group). Specifically, Adtec Coat (manufactured by Trade Services) can be used as the hydrophilic inorganic paint. Table 4 below shows the components of Adtec Coat (manufactured by Trade Services).

[0041] [Table 4]

[0042] By applying the hydrophilic inorganic paint to the second layer 122, a chemical reaction occurs between the silanol groups (Si-OH groups) of the silane coupling agent and the silanol groups (Si-OH groups) of the hydrophilic inorganic paint, forming a siloxane bond (Si-O-Si), as shown in FIG. 6. In other words, a chemical bond is formed between the hydrophilic inorganic paint and the silane coupling agent. The third layer 123 is then left to dry and then washed with pure water (St107). In this manner, the coating 120 is formed on the object 110 to be coated, i.e., the coated body 100 can be produced.

[0043] [Effect of painted body] The effects of the coated body 100 will now be described. As described above, the surface 100a of the coated body 100 (see FIG. 1) is composed of the third layer 123, which is a coating of hydrophilic inorganic paint. This makes the surface 100a hydrophilic and produces a self-cleaning effect. For example, when the coated body 100 is composed of the outer panel of an aircraft, it is preferable because dirt adhering to the surface 100a can be quickly removed by washing with water (see Examples).

[0044] Generally, hydrophobic organic paints and hydrophilic inorganic paints have little affinity with each other. Therefore, applying a hydrophilic inorganic paint to a hydrophobic organic paint film results in the hydrophilic inorganic paint being repelled, making it difficult to form a uniform, strong, and adhesive coating of the hydrophilic inorganic paint. However, as in this embodiment, by providing a second layer 122 containing a silane coupling agent between a first layer 121, which is a coating of a hydrophobic organic paint, and a third layer 123, which is a coating of a hydrophilic inorganic paint, chemical bonds can be formed between the silane coupling agent and the hydrophobic organic paint, and between the silane coupling agent and the hydrophilic inorganic paint. This allows the third layer 123 to be a coating of a hydrophilic inorganic paint that is uniform and strong in adhesion.

[0045] In addition, by using a mixed solution of a silane coupling agent and a base oil when forming the second layer 122, the coating 120 can be formed regardless of the surface shape of the object to be coated 110. Silane coupling agents are generally mixed with hexane and applied, but in this case, the mixed solution must be covered with a polyethylene terephthalate (PET) film or the like to prevent the hexane from evaporating until the chemical reaction of the silane coupling agent is complete, which places restrictions on the surface shape of the object to be coated. On the other hand, by using a base oil instead of hexane, the need for a PET film or the like is eliminated, making it possible to form the second layer 122 regardless of the surface shape of the object to be coated. Even when a base oil is used instead of hexane, a PET film or the like may be used for covering the mixed solution. [Example]

[0046] Coated bodies according to Examples and Comparative Examples were produced and various evaluations were carried out. Table 5 below shows the structure of each layer of the coated body.

[0047] [Table 5]

[0048] After applying a primer to the substrate, Skyhalo (registered trademark) Top Coat #400 (manufactured by Nippon Tokushu Toryo Co., Ltd.), a hydrophobic organic paint, was applied on the primer. Subsequently, a silane coupling agent (1 vol%) and additives were mixed to prepare a mixed solution. As shown in Table 5, the silane coupling agent was an isocyanate-based silane coupling agent, an amine-based silane coupling agent, or an epoxy-based silane coupling agent. As shown in Table 5, the additive was a poly-α-olefin-based low-viscosity base oil or an ester-based base oil.

[0049] Next, the above mixed solution was sprayed onto the coating of the organic hydrophobic paint. It was left to stand for 3 or 18 hours to allow a chemical reaction with the silane coupling agent to occur. After that, it was washed with hexane to remove the base oil. Furthermore, Adtec Coat (manufactured by Trade Services Co., Ltd.), a hydrophilic inorganic paint, was sprayed onto the mixed solution. It was then left to stand until the hydrophilic inorganic paint dried and washed with pure water. In this way, a coated body was produced.

[0050] In another example, hexane was used as an additive to the silane coupling agent. In this case, the mixed solution was applied to a coating of an organic hydrophobic paint by casting, and the mixed solution was covered with a PET sheet. Other aspects were the same as when base oil was used as an additive. Water was dropped onto the surface of each coated body, and the water contact angle was measured. Table 6 below shows the structure of the coated bodies according to the examples and the results of the water contact angle measurements. In Table 6, "Base Oil 164" refers to DURASYN (registered trademark) 164 (manufactured by INEOS), and "H208BRS" refers to Unistar (registered trademark) H208BRS (manufactured by NOF Corporation). "0 day" refers to the water contact angle measured immediately after preparation of the coated body, and "Water Resistant 1-4 Days" refers to the water contact angle measured after immersing the coated body in water for the specified number of days.

[0051] [Table 6]

[0052] As shown in the figure, for comparison, when only organic hydrophobic paint was applied on top of the primer, the water contact angle was 78°. On the other hand, when organic hydrophobic paint, a mixed liquid containing a silane coupling agent, and inorganic hydrophobic paint were applied on top of the primer, the water contact angle was small, at 5 to 10°. Furthermore, the water contact angle after immersing the coated object in water (water resistance for 1 day to 4 days) was also small, indicating sufficient adhesion of each coating film.

[0053] Furthermore, we evaluated the cleanability of a painted surface by a carbon oil test using an isocyanate-based silane coupling agent with DURASYN 164 base oil, which was allowed to react for 18 hours. In this test, powdered carbon black was mixed with machine oil and applied to the painted surface. The surface was then washed with water for approximately 10 seconds to assess cleanability. For comparison, Figure 7 shows photographs of a primer-coated organic hydrophobic paint before and after cleaning. As shown in the figure, carbon oil remained on the painted surface even after cleaning. In contrast, Figure 8 shows photographs of a primer-coated organic hydrophobic paint, a silane coupling agent-containing mixture, and an inorganic hydrophobic paint before and after cleaning. As shown in the figure, no carbon oil remained on the painted surface after cleaning, demonstrating high cleanability.

[0054] Furthermore, we evaluated the cleanability of a coated object using an insect injection device after adding DURASYN 164 base oil to an isocyanate-based silane coupling agent and allowing the reaction time to 18 hours. Using the insect injection device, insects were injected onto the coated surface using high-pressure air, and then the coated surface was rinsed with water for 5 seconds to confirm cleanability. The water flow rate was 11.8 mL / min. For comparison, Figure 9 shows photographs of the surface before and after cleaning when only an organic hydrophobic paint was applied over a primer. As shown in the figure, many insects (circled in the figure) remained on the coated surface even after cleaning. The cleaning rate, calculated as the number of insects washed away relative to the number of attached insects, was 21.4%. Meanwhile, Figure 10 shows photographs of the surface before and after cleaning when an organic hydrophobic paint, a mixture containing a silane coupling agent, and an inorganic hydrophobic paint were applied over a primer. As shown in the figure, the number of insects significantly decreased after cleaning, resulting in a cleaning rate of 85.2%.

[0055] As described above, it can be seen that the coated body according to the present invention has excellent self-cleaning properties and adhesion due to the high hydrophilicity of the coated surface.

[0056] Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and various modifications can be made, as a matter of course. [Explanation of symbols]

[0057] 100...painted body 110...Painting object 111...Base material 112...Primer 120...painting 121…1st layer 122…Second layer 123...Third layer

Claims

1. A hydrophobic organic paint; a mixed liquid obtained by mixing a silane coupling agent and a base oil; Hydrophilic inorganic paints and Paint set including.

2. 2. The paint set according to claim 1, The base oil is a poly-α-olefin-based base oil or an ester-based base oil. Paint set.

3. 3. The paint set according to claim 2, The base oil is hydrogenated poly(1-decene) or a diester of neopentyl glycol and 2-ethylhexane. Paint set.

4. 2. The paint set according to claim 1, The silane coupling agent is an isocyanate-based silane coupling agent, an amine-based silane coupling agent, or an epoxy-based silane coupling agent. Paint set.

5. 2. The paint set according to claim 1, Examples of the silane coupling agent include 3-(triethoxysilyl)propyl isocyanate, 3-aminopropyltriethoxysilane, triethoxy(3-glycidyloxypropyl)silane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 3-glycidoxypropyltriethoxysilane, N-2-(aminoethyl)-3-aminopropylmethyldimethoxysilane, and N-2-(aminoethyl)-3-aminopropyltrimethoxysilane. silane, 3-aminopropyltrimethoxysilane, 3-triethoxysilyl-N-(1,3-dimethylbutylidene)propylamine, N-phenyl-3-aminopropyltrimethoxysilane, N-(vinylbenzyl)-2-aminoethyl-3-aminopropyltrimethoxysilane hydrochloride, tris-(trimethoxysilylpropyl)isocyanurate, 3-ureidopropyltrialkoxysilane, 3-mercaptopropylmethyldimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-isocyanatopropyltriethoxysilane, or 3-trimethoxysilylpropylsuccinic anhydride. Paint set.

6. 2. The paint set according to claim 1, The hydrophilic inorganic coating material has a silanol group. Paint set.

7. 7. The paint set according to claim 6, The hydrophilic inorganic paint is a mixture of a silicon dioxide compound, a sodium hydrogen phosphate compound, a boric acid compound, and water. Paint set.

8. 2. The paint set according to claim 1, The hydrophobic organic paint is an acrylic paint, a urethane paint, or an ester paint. Paint set.

9. 9. The paint set according to claim 8, The hydrophobic organic paint is a two-component urethane paint. Paint set.

10. A hydrophobic organic paint is applied to an object to be painted to form a first layer; a mixed liquid of a silane coupling agent and a base oil is applied onto the first layer to form a second layer; A hydrophilic inorganic paint is applied onto the second layer to form a third layer. Painting method.

11. The coating method according to claim 10, In the step of forming the second layer, after a chemical reaction occurs between the hydrophobic organic coating material of the first layer and the silane coupling agent, the base oil is removed by washing. Painting method.

12. a first layer formed on the object to be coated and made of a hydrophobic organic paint; a second layer provided on the first layer and including a silane coupling agent; a third layer formed on the second layer and made of a hydrophilic inorganic paint; wherein the silane coupling agent forms a chemical bond with the hydrophobic organic paint and also forms a chemical bond with the hydrophilic inorganic paint. A coated body comprising:

13. The coated body according to claim 12, The silane coupling agent forms a siloxane bond with the hydrophilic inorganic coating material. Painted body.

14. The coated body according to claim 12, The silane coupling agent forms a urethane bond, a urea bond, or an amine-epoxy bond with the hydrophobic organic coating material. Painted body.

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