Surface treatment agent and method for producing the same, as well as surface treatment substrate and surface treatment method.

Abstract

To provide a surface treatment agent for use in forming a functional membrane's primer layer, capable of enhancing functionalities like water repellency in the functional membrane, and a method for producing the same, and a surface-treated substrate prepared with the surface treatment agent, as well as a surface treatment method.SOLUTION: A surface treatment agent comprises alkoxysilane condensate, and at least one of metal chloride and metal nitrate.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a surface treatment agent, a method for producing the same, a surface-treated substrate and a surface treatment method. Background Art

[0002] It is known that fluorine-containing compounds such as perfluoropolyether, when used for surface treatment of substrates, can exhibit excellent water repellency, oil repellency, stain resistance and the like. A surface-treated layer formed using a surface treatment agent containing such a fluorine-containing compound serves as a functional film such as a water-repellent layer, and is provided via a primer layer on a wide variety of substrates such as glass, plastics, fibers, and building members (see Patent Document 1). For example, a water-repellent layer is formed on the windshield of a vehicle for the purpose of ensuring visibility. Prior Art Documents Patent Documents

[0003] Patent Document 1 International Publication No. 2019 / 069642 Summary of the Invention Problems to be Solved by the Invention

[0004] In the technical field of surface treatment agents for forming water-repellent layers, materials with excellent water repellency are required, and there is an increasing demand for proposals of techniques to further improve water repellency. In addition, if the durability (for example, abrasion resistance) of a surface-treated layer having excellent water repellency is low, the surface-treated layer must be re-formed within a short period of time, so there is also a growing demand for techniques to further improve the durability of the surface-treated layer.

[0005] In view of the above problems, the present invention aims to provide a surface treatment agent used to form a base layer of a functional film having functional properties such as water repellency, a method for producing the same, and a surface treatment substrate and surface treatment method obtained using the surface treatment agent, which can improve the functionality of the functional film. [Means for solving the problem]

[0006] To solve the above problems, the present invention provides A surface treatment agent used to form a base layer of a surface treatment film having a water-repellent surface composed of perfluoropolyether, Alkoxysilane condensates and Aluminum chloride and aluminum acetylacetone are dispersed in water and / or a hydrophilic organic solvent. The present invention provides a surface treatment agent characterized by the following:

[0007] The present invention A method for producing a surface treatment agent used to form a base layer of a surface treatment film having a water-repellent surface composed of perfluoropolyether, In an alkoxysilane condensate solution containing an alkoxysilane condensate Aluminum chloride and aluminum acetylacetone The present invention provides a method for producing a surface treatment agent, characterized by mixing the ingredients and solving them in the presence of an acid catalyst.

[0008] The present invention provides a surface-treated substrate comprising a substrate having a first surface and a second surface facing the first surface, and a first surface treatment layer provided on at least the first surface, wherein the first surface treatment layer is formed by surface treatment using the above-mentioned surface treatment agent.

[0009] The present invention provides a surface treatment method characterized by applying the above-mentioned surface treatment agent to the surface of a substrate to be treated, thereby performing a surface treatment on the substrate. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a surface treatment agent used to form a base layer of a functional film having functional properties such as water repellency, a method for producing the same, and a surface treatment substrate and surface treatment method obtained using the surface treatment agent, which can improve the functionality of the functional film. [Modes for carrying out the invention]

[0011] Embodiments of the present invention will be described below. Embodiment 1 of this model is a surface treatment agent characterized by containing an alkoxysilane condensate and at least one of a metal chloride and a metal nitrate.

[0012] Embodiment 2 of this model is a surface treatment agent characterized in that, in Embodiment 1, the alkoxysilane condensate is a tetraethoxysilane condensate.

[0013] Embodiment 3 is a surface treatment agent characterized in that, in Embodiment 1 or Embodiment 2, the metal chloride is aluminum chloride. Embodiment 4 of this model is a surface treatment agent characterized in that, in Embodiment 3 above, it further contains cerium chloride as the metal chloride.

[0014] Embodiment 5 of this model is a surface treatment agent characterized in that, in any of embodiments 1 to 4 above, the metal nitrate is aluminum nitrate and cerium nitrate.

[0015] Embodiment 6 of this model is a surface treatment agent characterized by further containing aluminum acetylacetate in any of embodiments 1 to 5 described above.

[0016] Embodiment 7 of this model is a surface treatment agent characterized in that, in any of embodiments 1 to 6 above, it contains aluminum chloride and cerium chloride as the metal chloride, and the content ratio (molar ratio) of aluminum chloride to cerium chloride is 3:1 to 1:1.

[0017] Embodiment 8 is a surface treatment agent characterized in that, in any of embodiments 1 to 7 above, the surface treatment agent is used to form a base layer of a surface treatment film having a water-repellent surface.

[0018] Aspect 9 of the present embodiment is a method for producing a surface treatment agent, characterized in that at least one of a metal chloride and a metal nitrate is mixed into an alkoxysilane condensate solution containing an alkoxysilane condensate, and the mixture is formed into a sol in the presence of an acid catalyst.

[0019] Aspect 10 of the present embodiment is the method for producing a surface treatment agent according to Aspect 9 above, characterized in that the alkoxysilane is tetraethoxysilane.

[0020] Aspect 11 of the present embodiment is the method for producing a surface treatment agent according to Aspect 9 or 10 above, characterized in that the metal chloride is aluminum chloride. Aspect 12 of the present embodiment is the method for producing a surface treatment agent according to Aspect 11 above, characterized in that cerium chloride is further mixed as the metal chloride.

[0021] Aspect 13 of the present embodiment is the method for producing a surface treatment agent according to any one of Aspects 9 to 12 above, characterized in that the metal nitrate is aluminum nitrate and cerium nitrate.

[0022] Aspect 14 of the present embodiment is the method for producing a surface treatment agent according to any one of Aspects 9 to 13 above, characterized in that aluminum acetylacetonate is further mixed into the alkoxysilane condensate solution.

[0023] Aspect 15 of the present embodiment is the method for producing a surface treatment agent according to any one of Aspects 9 to 14 above, characterized in that aluminum chloride and cerium chloride are mixed as the metal chlorides, and the aluminum chloride and cerium chloride are mixed into the alkoxysilane condensate solution such that the molar ratio of the alkoxysilane to the aluminum chloride and the cerium chloride is from 9:1 to 7.5:2.5.

[0024] Embodiment 16 of this model is a method for producing a surface treatment agent, characterized in that, in any of embodiments 9 to 15 above, aluminum chloride and cerium chloride are mixed as the metal chloride, and the aluminum chloride and cerium chloride are mixed into the alkoxysilane condensate solution such that the ratio (molar ratio) of aluminum chloride to cerium chloride is 3:1 to 1:1.

[0025] Embodiment 17 of this model is a surface-treated substrate comprising a substrate having a first surface and a second surface facing the first surface, and a first surface treatment layer provided on at least the first surface, wherein the first surface treatment layer is formed by surface treatment using any of the surface treatment agents described in Embodiments 1 to 8.

[0026] Embodiment 18 is a surface treatment substrate characterized in that the substrate in Embodiment 17 is a glass substrate.

[0027] Embodiment 19 is a surface treatment substrate characterized by further comprising a second surface treatment layer provided on the first surface treatment layer in Embodiment 17 or Embodiment 18.

[0028] Embodiment 20 is a surface treatment substrate characterized in that, in Embodiment 19, the second surface treatment layer is a functional film.

[0029] Embodiment 21 is a surface treatment method characterized by applying any of the surface treatment agents described in Embodiments 1 to 8 to the surface of the substrate to be treated, thereby performing surface treatment on the substrate.

[0030] [Surface treatment agent] The surface treatment agent according to this embodiment contains an alkoxysilane condensate, at least one of metal chlorides and metal nitrates, and a solvent. The surface treatment agent according to this embodiment is used to form a primer layer under a functional film having properties such as water repellency on a substrate such as glass.

[0031] The alkoxysilane condensate in this embodiment is a hydrolysis-dehydration condensate compound obtained by a hydrolysis reaction and a dehydration condensation reaction of an alkoxysilane. Examples of alkoxysilanes include tetraalkoxysilanes such as tetraethoxysilane and tetramethoxysilane; trialkoxysilanes such as methyltrimethoxysilane, methyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane, and 3-glycidoxypropyrotoriethoxysilane; and dialkoxysilanes such as dimethoxydimethylsilane and diethoxydimethylsilane. Tetraalkoxysilane is preferred, and tetraethoxysilane is particularly preferred. The surface treatment agent according to this embodiment is a sol containing an alkoxysilane condensate and is used to form a base layer (primer layer) on a substrate by the sol-gel method. Therefore, as long as the surface treatment agent can exist as a sol, the alkoxysilane condensate only needs to be in dimer or more form. The surface treatment agent according to this embodiment may also contain unreacted alkoxysilane along with the alkoxysilane condensate.

[0032] In this embodiment, the solvent is preferably a mixed solvent of water and a hydrophilic organic solvent so as to be able to disperse the alkoxysilane condensate. Examples of hydrophilic organic solvents include C1-C5 alcohols such as methanol, ethanol, 1-propanol, isopropyl alcohol, and butanol. Preferably, alcohols that can disperse alkoxysilane and aqueous solutions of metal chlorides or metal nitrates (isopropyl alcohol) can be used. The solvent may contain water and at least one hydrophilic organic solvent.

[0033] The surface treatment agent according to this embodiment contains at least one of a metal chloride and a metal nitrate. Examples of metal chlorides include aluminum chloride (aluminum chloride hexahydrate, AlCl3·6H2O) and cerium chloride (cerium chloride heptahydrate, CeCl3·7H2O). Examples of metal nitrates include aluminum nitrate (aluminum nitrate nonahydrate, Al(NO3)3·9H2O) and cerium nitrate (cerium nitrate hexahydrate, Ce(NO3)3·6H2O). When the surface treatment agent contains aluminum chloride and cerium chloride as metal chlorides, the content ratio (molar ratio) of aluminum chloride to cerium chloride is preferably 3:1 to 1:1, and particularly preferably 3:2 to 1:1. When the content ratio (molar ratio) of aluminum chloride to cerium chloride is within the above range, particularly 3:1 to 1:1, the functionality of the functional film (for example, the water repellency of a water-repellent layer) can be improved when a functional film is formed on a base layer (primer layer) formed from a surface treatment agent.

[0034] The content ratio (molar ratio) of alkoxysilane condensate to at least one of metal chlorides and metal nitrates in the surface treatment agent according to this embodiment is a predetermined content ratio depending on the amount (molar ratio) of both (alkoxysilane and metal chloride, etc.) mixed when preparing the surface treatment agent, the progress of the hydrolysis reaction and dehydration condensation reaction of alkoxysilane, etc. By having the above-described predetermined content ratio of alkoxysilane condensate to at least one of metal chlorides and metal nitrates, when a functional film is formed on the underlayer (primer layer) formed from the surface treatment agent, the functionality of the functional film (for example, the water repellency of a water-repellent layer) can be improved.

[0035] The surface treatment agent according to this embodiment may contain aluminum acetylacetate (Al(acac)). By including aluminum acetylacetate, a base layer (primer layer) can be formed that can further improve the water-repellent effect of the water-repellent layer as a functional film. The content ratio (molar ratio) of aluminum acetylacetate to the alkoxysilane condensate is not particularly limited, and is a predetermined content ratio depending on the amount (molar ratio) of both (alkoxysilane and aluminum acetylacetate) mixed when preparing a surface treatment agent that obtains the desired effect, the progress of the hydrolysis reaction and dehydration condensation reaction of the alkoxysilane, etc.

[0036] The surface treatment agent according to this embodiment may contain an acid catalyst. The inclusion of an acid catalyst can accelerate the hydrolysis and dehydration condensation reactions of alkoxysilane, thereby reducing the amount of unreacted alkoxysilane in the surface treatment agent. Examples of acid catalysts include hydrochloric acid, nitric acid, sulfuric acid, acetic acid, phosphoric acid, and oxalic acid.

[0037] As will be clear from the examples described later, the surface treatment agent according to this embodiment can be used to form a base layer (primer layer) on the surface of a substrate (e.g., glass substrate, metal substrate, rubber substrate, resin substrate, etc.) by the sol-gel method. By forming a functional film having functionality (e.g., water repellency) on the base layer, the functionality (water repellency) can be improved, and the durability of the functional film can be improved. Here, water repellency means, for example, that when a water droplet is dropped onto the functional film formed on the substrate and the substrate is tilted, the angle at which the water droplet slides off (fall angle, sliding angle) is measured using a contact angle meter (e.g., DropMaster DMo-601 (product name) manufactured by Kyowa Interface Science Co., Ltd., etc.), and the fall angle is relatively small. Specifically, the fall angle should be 15° or less, preferably 10° or less.

[0038] The surface treatment agent according to this embodiment can be used to form a primer layer under a functional film that imparts functionality such as water repellency to the surface of a substrate such as glass, metal, rubber, plastic, or fiber. As a result, the water repellency of the functional film formed on the surface of the substrate can be improved, and the durability of the functional film can also be improved.

[0039] [Method for manufacturing surface treatment agents] The method for producing the surface treatment agent according to this embodiment includes the steps of: preparing an alkoxysilane condensate solution by adding alkoxysilane and an acid catalyst to a solvent and mixing and stirring to allow the hydrolysis reaction and dehydration condensation reaction of the alkoxysilane to proceed; preparing an aluminum chloride solution by adding aluminum chloride as a metal chloride and an acid catalyst to a solvent and mixing and stirring; preparing a cerium chloride solution by adding cerium chloride as a metal chloride and an acid catalyst to a solvent and mixing and stirring; and producing a sol-like surface treatment agent by mixing and stirring the alkoxysilane condensate solution with the aluminum chloride solution and / or the cerium chloride solution, and further adding aluminum acetylacetone and mixing and stirring.

[0040] The solvent can be any solvent capable of dispersing the alkoxysilane condensate and aluminum chloride and cerium chloride. For example, a mixed solvent of water and a hydrophilic organic solvent (e.g., methanol, ethanol, 1-propanol, isopropyl alcohol, butanol, or other C1-C5 alcohols) can be used.

[0041] The amount (molar ratio) of the mixture of alkoxysilane and aluminum chloride and / or cerium chloride may be within the range of 9:1 to 7:3, and preferably within the range of 9:1 to 7.5:2.5.

[0042] When manufacturing a surface treatment agent containing aluminum chloride and cerium chloride, the mixing ratio (molar ratio) of aluminum chloride to cerium chloride is preferably, for example, 3:1 to 1:1, and particularly preferably 3:2 to 1:1.

[0043] The amount (molar ratio) of aluminum acetylacetate should be approximately 1-20% relative to the alkoxysilane. By keeping the amount of aluminum acetylacetate within this range, a primer layer can be formed that can further improve the water-repellent effect of the water-repellent layer as a functional film.

[0044] A sol-like surface treatment agent can be produced by mixing and stirring the alkoxysilane condensate solution, aluminum chloride solution, and cerium chloride solution prepared as described above, and then adding and stirring aluminum acetylacetone. The surface treatment agent produced in this way may be used in the surface treatment method described later after adjusting the solid content concentration to a desired range by adding a solvent (a mixed solvent of water and a hydrophilic organic solvent). Alternatively, the surface treatment agent according to this embodiment may be produced by mixing and stirring the alkoxysilane condensate solution, aluminum chloride solution, and cerium chloride solution without adding aluminum acetylacetone.

[0045] [Surface treatment method] The surface treatment method in this embodiment includes the steps of forming a first surface treatment layer on the surface of a substrate to be treated by applying a surface treatment agent according to this embodiment (hereinafter sometimes referred to as the "first surface treatment agent") to the surface of the substrate to be treated, and forming a second surface treatment layer by applying a surface treatment agent (hereinafter sometimes referred to as the "second surface treatment agent") on the first surface treatment layer.

[0046] The method for applying the first surface treatment agent to the surface of the substrate to be treated is not particularly limited, and examples include applying it using a brush, roller, spray, etc., immersing the substrate to be treated in the first surface treatment agent, and casting the first surface treatment agent onto the substrate to be treated. In the method of immersing the substrate to be treated in the first surface treatment agent, the speed at which the substrate to be treated is lifted out of the immersed substrate may be, for example, about 6 to 300 mm / min, and preferably about 30 to 100 mm / min.

[0047] In this embodiment, a first surface treatment layer can be formed by heating a coating film formed by applying a first surface treatment agent to the surface of a substrate to be treated. This first surface treatment layer functions as a base layer (primer layer) for the second surface treatment layer, which will be described later. Methods for heating the coating film include, for example, heating in an oven, but are not particularly limited. As for heating conditions, for example, a temperature range of 20 to 600°C for about 10 to 120 minutes, preferably a temperature range of 20 to 500°C for about 30 to 100 minutes. In this case, the coating film may be heated with an initial heating temperature in the range of 20 to 30°C and a heating rate of 5 to 10°C / min.

[0048] The second surface treatment agent can be any agent capable of forming a second surface treatment layer that exhibits functional properties such as water repellency. For example, it can be an agent whose main component is a fluorine-containing compound such as a perfluoropolyether or a perfluoroalkyl group.

[0049] The method for applying the second surface treatment agent to the first surface treatment layer formed on the surface of the substrate to be treated is not particularly limited, but examples include a method of immersing the substrate on which the first surface treatment layer has been formed in the second surface treatment agent (dipping method). In this case, the speed at which the substrate to be treated is withdrawn from the second surface treatment agent may be, for example, about 20 to 100 mm / min, and preferably about 30 to 60 mm / min.

[0050] As described above, by carrying out a surface treatment method using the surface treatment agent according to this embodiment, a surface-treated substrate can be manufactured in which a first surface treatment layer (underlayer, primer layer) is formed on the surface (treated surface) of the substrate to be treated. In such a surface-treated substrate, the first surface treatment layer only needs to be formed on the surface (first surface) of the substrate to be treated (substrate), but may also be formed on the back surface (second surface), or on both the surface (first surface) and the back surface (second surface). By forming a second surface treatment layer capable of exhibiting functionalities such as water repellency on the first surface treatment layer of the surface-treated substrate manufactured in this manner, the second surface treatment layer can exhibit excellent water repellency, and a water-repellent surface-treated substrate with excellent durability can be manufactured.

[0051] The substrate to be treated (substrate) is not particularly limited as long as a water-repellent surface is required, but examples include glass substrates; resin substrates such as PET (polyethylene terephthalate), PE (polyethylene), PU (polyurethane), polycarbonate, PMMA (polymethylmethacrylic acid); and metal substrates such as aluminum and SUS.

[0052] The embodiments described above are provided to facilitate understanding of the present invention and are not intended to limit it. Accordingly, each element disclosed in the above embodiments is intended to include all design modifications and equivalents that fall within the technical scope of the present invention. [Examples]

[0053] The present invention will be described in more detail below with reference to manufacturing examples, test examples, etc., but the present invention is not limited in any way to the test examples, etc. described below.

[0054] [Example of surface treatment agent manufacturing 1] A sol-like tetraethoxysilane solution was prepared by mixing and stirring tetraethoxysilane, isopropyl alcohol, water, and a 60% aqueous nitric acid solution. A surface treatment agent (sample 1) was produced by adding isopropyl alcohol to the tetraethoxysilane solution so that the solid content concentration was 5%. The amounts of each material used in this production example 1 are shown in Table 1.

[0055] [Example of surface treatment agent manufacturing 2] A tetraethoxysilane solution was prepared by mixing and stirring tetraethoxysilane, isopropyl alcohol, water, and a 60% aqueous nitric acid solution. An aluminum chloride solution was prepared by mixing and stirring aluminum chloride hexahydrate, isopropyl alcohol, water, and a 60% aqueous nitric acid solution. The tetraethoxysilane solution and the aluminum chloride solution were mixed and stirred to form a sol so that the molar ratio of tetraethoxysilane to aluminum chloride was 8:2. Isopropyl alcohol was added to achieve a solid content concentration of 5% to produce a surface treatment agent (sample 2). The amounts of each material used in this production example 2 are shown in Table 1.

[0056] [Examples of surface treatment agent manufacturing 3-8] In Production Example 2, after mixing and stirring the tetraethoxysilane solution and the aluminum chloride solution, aluminum acetylacetone was added, and isopropyl alcohol was added to achieve a solid content concentration of 5% to produce surface treatment agents (samples 3-8). The amounts of each material used in Production Examples 3-8 are shown in Table 1.

[0057] [Example of surface treatment agent manufacturing 9] A tetraethoxysilane solution was prepared by mixing and stirring tetraethoxysilane, isopropyl alcohol, water, and a 60% aqueous nitric acid solution. An aluminum chloride solution was prepared by mixing and stirring aluminum chloride hexahydrate, isopropyl alcohol, water, and a 60% aqueous nitric acid solution. A cerium chloride solution was prepared by mixing and stirring cerium chloride heptahydrate, isopropyl alcohol, water, and a 60% aqueous nitric acid solution. The tetraethoxysilane solution, aluminum chloride solution, and cerium chloride solution were mixed and stirred to form a sol with a molar ratio of 8:1.5:0.5, and isopropyl alcohol was added to produce a surface treatment agent (sample 9) with a solid content of 5%. The amounts of each material used in this production example 9 are shown in Table 1.

[0058] [Examples of surface treatment agent manufacturing 10-13] In Production Example 9, after mixing and stirring tetraethoxysilane solution, aluminum chloride solution, and cerium chloride solution, aluminum acetylacetone was added, and isopropyl alcohol was added to achieve a solid content concentration of 5% to produce surface treatment agents (samples 10-13). The amounts of each material used in Production Examples 10-13 are shown in Table 1.

[0059] [Examples of surface treatment agent manufacturing 14-18] Surface treatment agents (samples 14-18) were prepared in the same manner as in production examples 9-13, except that the amounts (molar ratio) of tetraethoxysilane, aluminum chloride, and cerium chloride were set to 8:1:1. The amounts of each material used in production examples 14-18 are shown in Table 1.

[0060] [Table 1]

[0061] [Test Example 1] A glass slide was prepared as the substrate to be treated, and the glass slide was subjected to ultrasonic cleaning and acid cleaning. Then, the glass slide was immersed in a surface treatment agent (samples 1 to 18) and pulled out at a speed of 60 mm / min to form a coating of the surface treatment agent on the surface of the glass slide. The glass slide with the surface treatment agent coating was then subjected to a firing process to form a base layer (primer layer) on the surface of the glass slide.

[0062] A glass slide with a primer layer formed on it was immersed in a mixture of perfluoropolyether (KY-1901, manufactured by Shin-Etsu Chemical Co., Ltd.) and hydrofluoroether (AE-3000, manufactured by AGC Inc.), and then withdrawn at a speed of 600 mm / min to form a perfluoropolyether coating on the primer layer. The glass slide with the coating then underwent heat treatment to harden the coating and form a water-repellent layer.

[0063] A water droplet (40 μL) was dropped onto the water-repellent layer of a horizontally placed microscope slide. The slide was then tilted in 1° increments, and the tilt angle (fall angle) at which the water droplet began to move was determined. Whether or not the water droplet had started to move was determined using a contact angle meter (product name: DropMaster DMo-601, manufactured by Kyowa Interface Science Co., Ltd.) to see if it moved more than 3 dots per second.

[0064] For comparison, a slide glass without a primer layer was immersed in a mixture of perfluoropolyether (KY-1901, manufactured by Shin-Etsu Chemical Co., Ltd.) and hydrofluoroether (AE-3000, manufactured by AGC Inc.) to form a water-repellent layer (sample 19) in the same manner as described above, and the tilt angle (falling angle) of the slide glass was determined in the same manner as described above. The results are shown in Table 2.

[0065] [Test Example 2] Using a friction and wear tester (product name: FPR-2100, manufactured by Resca Co., Ltd.), steel wool (#0000) was pressed onto the water-repellent layer of the slide glass (samples 1-19) used in Test Example 1 with a load of 1 kg, and the steel wool was rubbed a predetermined number of times (50, 100, 200, 300, 400, 500 times) at a speed of 60 mm / sec. A water droplet (40 μL) was dropped onto the water-repellent layer rubbed with steel wool, and the slide glass was tilted 1° at a time to determine the tilt angle (fall angle) of the slide glass when the water droplet began to move. Whether or not the water droplet had started to move was determined using a contact angle meter (product name: DropMaster DMo-601, manufactured by Kyowa Interface Science Co., Ltd.) by checking whether more than 3 dots moved per second. The results are shown in Table 2.

[0066] [Table 2]

[0067] In Table 2, the fall angle (deg) at "0 (times)" is the result of Test Example 1, and the fall angle (deg) at "50 (times)" to "500 (times)" is the result of Test Example 2. As shown in Table 2, it was confirmed that the water-repellent layer formed on the substrate formed with surface treatment agents containing alkoxysilane condensate and aluminum chloride (Samples 2-8) has superior water repellency compared to the water-repellent layer formed on the substrate formed with surface treatment agent containing alkoxysilane condensate (Sample 1). Furthermore, it was confirmed that the water-repellent layer formed on the substrate formed with surface treatment agents of Samples 2-8 also has superior durability (abrasion resistance).

[0068] It was confirmed that a water-repellent layer formed on a substrate using a surface treatment agent (samples 9-18) containing alkoxysilane condensate, aluminum chloride, and cerium chloride, with a molar ratio of aluminum chloride to cerium chloride of 3:1 to 1:1, exhibited superior water repellency and durability (abrasion resistance) compared to a water-repellent layer formed on a substrate using a surface treatment agent (sample 1) containing alkoxysilane condensate.

[0069] Furthermore, it was confirmed that the water-repellent layers formed on the substrates created by surface treatment agents containing alkoxysilane condensate and aluminum chloride (samples 2-8) and surface treatment agents containing alkoxysilane condensate, aluminum chloride, and cerium chloride (samples 9-18) exhibited superior water repellency and durability (abrasion resistance) compared to a water-repellent layer formed directly on a slide glass without such a substrate (water-repellent layer of sample 19).

Claims

1. A surface treatment agent used to form a base layer of a surface treatment film having a water-repellent surface composed of a perfluoropolyether, A surface treatment agent characterized by dispersing an alkoxysilane condensate, aluminum chloride, and aluminum acetylacetone in water and / or a hydrophilic organic solvent.

2. The surface treatment agent according to claim 1, characterized in that the alkoxysilane condensate is a tetraethoxysilane condensate.

3. The surface treatment agent according to claim 1 or 2, characterized in that it further comprises a dispersion of cerium chloride.

4. The surface treatment agent according to claim 3, characterized in that the content ratio (molar ratio) of aluminum chloride to cerium chloride is 3:1 to 1:

1.

5. A method for producing a surface treatment agent used to form a base layer of a surface treatment film having a water-repellent surface composed of a perfluoropolyether, A method for producing a surface treatment agent, characterized by mixing aluminum chloride and aluminum acetylacetate with an alkoxysilane condensate solution containing an alkoxysilane condensate, and then solifying the mixture in the presence of an acid catalyst.

6. The method for producing a surface treatment agent according to claim 5, characterized in that the alkoxysilane is tetraethoxysilane.

7. The method for producing a surface treatment agent according to claim 5 or 6, characterized in that cerium chloride is further mixed with the alkoxysilane condensate solution.

8. A method for producing a surface treatment agent according to claim 5 or 6, characterized in that the aluminum chloride is mixed into the alkoxysilane condensate solution such that the ratio (molar ratio) of the alkoxysilane to the aluminum chloride is 9:1 to 7.5:2.

5.

9. The method for producing a surface treatment agent according to claim 7, characterized in that the aluminum chloride and cerium chloride are mixed in the alkoxysilane condensate solution such that the ratio (molar ratio) of aluminum chloride to cerium chloride is 3:1 to 1:

1.

10. A substrate having a first surface and a second surface facing the first surface, A first surface treatment layer provided on at least the first surface and Equipped with, The surface-treated substrate is characterized in that the first surface-treated layer is formed by surface treatment using the surface treatment agent described in claim 1 or 2.

11. The surface treatment substrate according to claim 10, characterized in that the substrate is a glass substrate.

12. The surface treatment substrate according to claim 10, further comprising a second surface treatment layer provided on the first surface treatment layer.

13. The surface treatment substrate according to claim 12, characterized in that the second surface treatment layer is a surface treatment film having a water-repellent surface composed of a perfluoropolyether.

14. A surface treatment method characterized by applying the surface treatment agent described in claim 1 or 2 to the surface of a substrate to be treated, thereby performing a surface treatment on the substrate to be treated.

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