JP5801088B2 - Paint composition - Google Patents

Description

  The present invention relates to a coating composition.

  In recent years, paints are also required to be environmentally friendly, and water-based systems are required. However, water-based paints have a problem that paintability is deteriorated due to a high surface tension of water. Various coating agents are used to solve this problem, but the performance is not yet satisfactory particularly for a water-repellent substrate. Also, highly weather-resistant coatings such as fluorine coatings and inorganic coatings often have high water repellency, and it is difficult to repeatedly apply water-based paints. Patent Document 1 discloses a technique for reducing the surface tension of a coating material by adding a composition containing a specific amount of a hydrocarbon surfactant and a specific amount of a fluorocarbon surfactant.

Special table 2003-535950 gazette

  However, with the technique described in Patent Document 1, it is difficult to achieve both the paintability and the foaming property of the coating material, and it is difficult to simply and surely apply to a substrate that is particularly difficult to paint.

  An object of the present invention is to provide a coating composition that is excellent in paintability and foamability and that can be easily and reliably applied even to a substrate that is particularly difficult to paint.

  As a result of intensive studies aimed at solving the above problems, the present inventors have reached the present invention.

  That is, the present invention is as follows.

[1]
Including water, a hydrocarbon surfactant, a fluorocarbon surfactant, and a binder component;
The content of the hydrocarbon surfactant is 0.001% by mass or more and 0.0085% by mass or less, the content of the fluorocarbon surfactant is 0.0001% by mass or more and 0.5% by mass or less, and the binder component The coating composition whose content is 0.1 mass% or more and 50 mass% or less.

[2]
Further containing saturated hydrocarbon alcohols,
Coating composition as described in [1] whose content of saturated hydrocarbon alcohol is 5 mass% or more and 40 mass% or less.

[3]
The coating composition according to [2], wherein the saturated hydrocarbon alcohol is at least one selected from the group consisting of methyl alcohol, ethyl alcohol, propyl alcohol, and isopropyl alcohol.

[4]
The coating composition according to any one of [1] to [3], wherein a dynamic surface tension in 20 milliseconds measured by a maximum bubble pressure method is 45 mN / m or less.

[5]
A functional composite comprising the coating composition according to any one of [1] to [4].

[6]
[1] A functional composite formed by forming a film containing the coating composition according to any one of [4] on a substrate.

[7]
The functional composite according to [6], wherein the substrate has a water contact angle at 23 ° C of 90 ° or more.

[8]
The coating method using the coating composition in any one of [1]-[4].

[9]
The coating method which coats the coating composition in any one of [1]-[4] on a base material by the spray spraying method.

  The coating composition of the present invention is excellent in paintability and foamability, and can be easily and reliably applied to a substrate that is particularly difficult to paint.

  Hereinafter, a mode for carrying out the present invention (hereinafter simply referred to as “the present embodiment”) will be described in detail. However, the present invention is not limited to the following embodiment. The present invention can be variously modified without departing from the gist thereof.

≪Paint composition≫
The coating composition of this embodiment contains water, a hydrocarbon surfactant, a fluorocarbon surfactant, and a binder component. Further, the content of the hydrocarbon surfactant is 0.001% by mass or more and 0.0085% by mass or less, and the content of the fluorocarbon surfactant is 0.0001% by mass or more and 0.5% by mass or less, Content of a binder component is 0.1 to 50 mass%. In the coating composition of this embodiment, the content of water is not particularly limited as long as the content of other components falls within the specific range, but is 0.1% by mass or more and 99.9% by mass or less. Is preferable, and more preferably 1% by mass or more and 99% by mass or less.

<Hydrocarbon surfactant>
As the hydrocarbon surfactant used in the present embodiment, any of nonionic, anionic, cationic and amphoteric surfactants can be used.

  Nonionic surfactants include ester types in which polyhydric alcohols such as glycerin, sorbitol, sucrose and fatty acids are ester-bonded, polyoxyethylene alkyl ethers, polyoxyethylene alkyl phenyl ethers, polyoxyethylene polyoxypropylene glycols, etc. And the polyether type.

  Examples of anionic surfactants include carboxylate types such as alkyl ether carboxylates, sulfonate types such as linear alkylbenzene sulfonates, α-olefin sulfonates, dialkylsulfosuccinates, and alkyl sulfates. Examples thereof include salts and sulfate ester salt types such as polyoxyethylene alkyl sulfates.

  Examples of the cationic surfactant include an amine salt type and a quaternary ammonium salt type.

  Examples of amphoteric surfactants include carboxylate type, amino acid type, and betaine type.

  Among these hydrocarbon surfactants, dioctyl sulfosuccinate is preferable because of its great effect of improving paintability. Specific examples of the dioctyl sulfosuccinate include trade name Perex OT-P (Kao Corporation), trade name Aerosol OT-75 (Cytech Industry Co., Ltd.) and the like.

  These hydrocarbon surfactants may be used alone or in combination of two or more.

  In the coating composition of the present embodiment, the content of the hydrocarbon surfactant is 0.001% by mass or more and 0.0085% by mass or less, preferably 0.002% by mass or more and 0.0085% by mass or less. . The content of the hydrocarbon surfactant is preferably 0.0085% by mass or less from the viewpoint of the effect of improving the wettability and the foaming property.

<Fluorocarbon surfactant>
Although there is no restriction | limiting in particular as a fluorocarbon surfactant used for this embodiment, The nonionic, anionic, cationic, amphoteric surfactant etc. containing the C3-C20 perfluoroalkyl group etc. Can be preferably used.

  Specific examples of the fluorocarbon surfactant include perfluoroalkyl sulfonates, perfluoroalkyl carboxylates, perfluoroalkyl ethylene oxide adducts, etc. Among them, when a perfluoroalkyl ethylene oxide adduct is used, The effect of reducing the surface tension is great, which is preferable. Specific examples of the perfluoroalkylethylene oxide adduct include Megafac F-444 (DIC Corporation) and Surflon S-242 (AGC Seimi Chemical Corporation).

  These fluorocarbon surfactants may be used alone or in combination of two or more.

  In the coating composition of the present embodiment, the content of the fluorocarbon surfactant is 0.0001% by mass or more and 0.5% by mass or less, and considering cost effectiveness, preferably 0.3% by mass or less, Preferably, it is 0.1 mass% or less.

<Binder component>
Examples of the binder component used in the present embodiment include solids of a polymer aqueous dispersion such as latex and solids of a water-soluble resin. From the viewpoint of weather resistance, water resistance, etc., it is possible to use the solids of latex. preferable. Various known materials can be used as such latex, and examples thereof include acrylic latex, styrene-butadiene latex, PTFE latex, and the like. In particular, the silicone-modified latex is more preferable because it exhibits high weather resistance and durability. Such silicone-modified latex can be obtained, for example, by the method described in JP-A-2003-3030.

  These binder components may be used alone or in combination of two or more.

  In the coating composition of this embodiment, the content of the binder component is 0.1% by mass or more and 50% by mass or less, and preferably 0.1% by mass or more and 40% by mass or less. When the content of the binder component is within the above range, the film formability becomes better, which is preferable.

<Saturated hydrocarbon alcohol>
It is preferable that the coating composition of this embodiment further contains a saturated hydrocarbon alcohol.

  By including a saturated hydrocarbon alcohol in the coating composition of the present embodiment, the wettability tends to be further improved. The saturated hydrocarbon alcohol is preferably at least one selected from the group consisting of methyl alcohol, ethyl alcohol, propyl alcohol, and isopropyl alcohol from the viewpoint of the effect of improving volatility, odor, and paintability. In view of safety, ethyl alcohol is more preferable.

  These saturated hydrocarbon alcohols may be used alone or in combination of two or more.

  In the coating composition of the present embodiment, the content of the saturated hydrocarbon alcohol is preferably 5% by mass or more and 40% by mass or less. The content of the saturated hydrocarbon alcohol is preferably 40% by mass or less from the balance between improvement in paintability, safety and cost.

<Other ingredients>
The coating composition of the present embodiment can contain other components depending on the required physical properties. Examples of other components include an ultraviolet absorber, a light stabilizer, a photocatalyst, a hydrophilizing agent, a color pigment, an extender pigment, a dispersion stabilizer, an antifoaming agent, a viscosity modifier, and a dye. In the coating composition of the present embodiment, the content of other components is not particularly limited as long as it does not impair the purpose of the present embodiment. It is preferable.

  As the UV absorber, for example, at least one selected from the group consisting of a benzophenone UV absorber, a benzotriazole UV absorber and a triazine UV absorber can be used, and as the light stabilizer, for example, hindered amine light At least one selected from the group consisting of stabilizers can be used. Moreover, since it is excellent in a weather resistance, it is preferable to use an ultraviolet absorber and a light stabilizer in combination.

Examples of the photocatalyst that can be used in this embodiment include TiO ₂ , ZnO, SrTiO ₃ , BaTiO ₃ , BaTiO ₄ , BaTi ₄ O ₉ , K ₂ NbO ₃ , Nb ₂ O ₅ , Fe ₂ O ₃ , Ta _2. From O ₅ , K ₃ Ta ₃ Si ₂ O ₃ , WO ₃ , SnO ₂ , Bi ₂ O ₃ , BiVO ₄ , NiO, Cu ₂ O, RuO ₂ , CeO _2, etc., and further from Ti, Nb, Ta, and V Layered oxides having at least one selected element (for example, JP-A 62-74452, JP-A-2-172535, JP-A-7-24329, JP-A-8-89799, JP-A JP-A-8-89800, JP-A-8-89804, JP-A-8-198061, JP-A-9-248465, JP-A-10-99694, JP-A-10-244165 Reference) can be mentioned.

Among these photocatalysts, TiO ₂ (titanium oxide) is preferable because it is harmless and has excellent chemical stability. As the titanium oxide, any of anatase type, rutile type and brookite type can be used.

  Examples of the hydrophilizing agent that can be used in the present embodiment include hydrophilic metal oxides such as colloidal silica and colloidal zirconia. By containing a hydrophilizing agent, it is possible to make the resulting functional complex more hydrophilic. The content of the hydrophilizing agent can be arbitrarily changed according to the required degree of hydrophilicity, but is preferably 0.1% by mass or more and 50% by mass or less.

<Characteristics of paint composition>
The coating composition of the present embodiment preferably has a dynamic surface tension of 20 msec or less measured by the maximum bubble pressure method of 45 mN / m or less, more preferably 40 mN / m or less, and even more preferably 35 mN / m. It is as follows. Although the minimum of the said dynamic surface tension is not specifically limited, For example, it is 10 mN / m or more.

  The dynamic surface tension is a particularly important numerical value when coating is performed on a substrate moving at a high speed, and a lower value is more preferable. It is also important when coating is performed when the substrate temperature is high (preheating conditions), and a lower value is more preferable.

  The coating composition of this embodiment preferably has a static surface tension at 5000 milliseconds measured by the maximum bubble pressure method of 40 mN / m or less, more preferably 30 mN / m or less, and even more preferably 20 mN / m. m or less. Although the minimum of static surface tension is not specifically limited, For example, it is 5 mN / m or more. It is preferable that the static surface tension is in the above-mentioned range, particularly from the viewpoint of paintability under conditions where it takes time to dry the coating composition.

  In the present embodiment, the dynamic surface tension and the static surface tension can be measured in detail by the method described in Examples described later.

In the coating composition of the present embodiment, the expansion ratio after the following operation A is preferably 4 times or less, more preferably 3 times or less, and even more preferably 2 times or less. Although the minimum of this foaming multiple is not specifically limited, For example, it is 1 time. When the expansion ratio is within the above range, the foaming property is excellent, so that coating can be appropriately performed.
[Operation A: An operation in which the coating composition (30 mL) is placed in a 250 mL graduated cylinder and sealed, and the process of reversing the top and bottom is repeated 10 times. ]
Foaming factor = (Volume of coating composition containing generated foam after operation A / Volume of coating composition before operation A (30 mL))
In recent years, many highly durable fluorine-containing paints and inorganic paints have been used, but the coatings formed from these fluorine-containing paints and inorganic paints have a water contact angle of 90 ° or more in some cases. It is difficult to apply a water-based paint from above.

  However, when the coating composition of the present embodiment is used, it is possible to simply apply to a water-repellent coating film and a substrate, and further impart a function to a coating film formed from a highly durable fluorine paint. Is possible. In addition, it exhibits good paintability for inorganic paints, organic / inorganic composite paints, and coating films formed from organic paints. Thus, since the coating composition of this embodiment has extremely excellent paintability, the coating film formed from the coating composition is uniform, uniform, and excellent in appearance.

≪Painting method≫
The coating method of the present embodiment is not particularly limited as long as the above-described coating composition is used, and various known methods can be used. For example, spraying method, flow coating method, roll coating method, brush coating Method, dip coating method, spin coating method, screen printing method, casting method, gravure printing method, flexographic printing method and the like. Of these, spray spraying is preferred. Specifically, a method of coating the above-described coating composition on a substrate by a spray spraying method is preferable.

≪Functional complex≫
The functional composite of this embodiment includes the above-described coating composition. For example, a functional composite formed by forming a film containing the above-described coating composition on a substrate is preferable.

  The functional composite of the present embodiment is, for example, after applying a coating composition to a substrate and drying it, preferably after heat treatment at 20 ° C. to 500 ° C., more preferably at 40 ° C. to 250 ° C., ultraviolet irradiation, etc. And forming a film containing the coating composition on the substrate. Moreover, it can obtain also by apply | coating a coating composition with respect to the base material heated at 40-250 degreeC.

  When the coating composition of this embodiment is formed in a film form on a substrate, the thickness of the film is preferably 0.05 to 100 μm, more preferably 0.1 to 10 μm.

  The substrate used for obtaining the functional composite of the present embodiment is not particularly limited, and for example, all substrates used for the use described later can be used.

  In general, the base material constituting the functional composite is preferably a low water contact angle from the viewpoint of paintability, but in the functional composite of the present embodiment, the above-described paint having excellent paintability. Since the composition is used, the base material may have a water contact angle at 23 ° C. of 90 ° or more.

  In this embodiment, a water contact angle can be measured by the method as described in the below-mentioned Example.

  Specific examples of the substrate used to obtain the functional composite of the present embodiment include organic substrates such as synthetic resins and natural resins, and inorganic groups such as metals, ceramics, glass, stone, cement, and concrete. Materials, combinations thereof, and the like can be given. Examples of the shape include a film and a board.

≪Usage≫
Examples of the use of the coating composition of the present embodiment include coating materials for building materials, building exteriors, building interiors, window frames, window glass, structural members, and building equipment such as houses. Therefore, the functional composite containing the coating composition of this embodiment can be used for the exterior of a building. Since the coating composition of the present embodiment can form a coating film having an excellent appearance as described above, transparency is required for exterior and painting of vehicles, covers for vehicle lighting, window glass, instruments, display panels, etc. It is useful as a coating material for a member. In addition, the coating composition of the present embodiment is a mechanical device or exterior of articles, dust-proof covers and coatings, display devices, covers, traffic signs, various display devices, display objects such as advertising towers, roads, railways, etc. Sound insulation walls, bridges, guardrail exteriors and paintings, tunnel interiors and paintings, insulators, solar battery covers, solar water heater heat collection covers, etc., exterior parts of electronic and electrical equipment used outside, especially transparent materials, plastic houses, greenhouses, etc. It can also be used for the exterior.

  The present invention will be specifically described by the following examples and comparative examples, but these do not limit the scope of the present invention.

  In Examples and Comparative Examples, various physical properties were measured by the following methods.

[Measurement method of physical properties]
1. Surface tension The surface tension of the coating compositions obtained in Examples and Comparative Examples was measured by a maximum bubble pressure method using a BP-D5 type dynamic surface tension meter manufactured by Kyowa Interface Science, Japan. The measured value at 20 milliseconds was the dynamic surface tension, and the measured value at 5000 milliseconds was the static surface tension.

2. Appearance The appearance of the coating film after coating the coating compositions obtained in Examples and Comparative Examples on the substrate was visually observed and evaluated according to the following criteria.

(Evaluation criteria)
Good: There was no coating unevenness.

  Normal: There was some paint unevenness.

  Defect: There was obvious coating unevenness.

3. Water contact angle A drop of deionized water was placed on the surface of the substrate or the coating film and allowed to stand at 23 ° C. for 1 minute, and then the water contact angle was measured using a CA-X150 contact angle meter manufactured by Kyowa Interface Science, Japan. .

4). Foaming property The expansion ratio of the coating composition was determined as follows. It was evaluated that the smaller the expansion factor, the better the foaming property.

  Procedure A: The coating composition (30 mL) obtained in Examples and Comparative Examples was placed in a 250 mL graduated cylinder and sealed, and the process of reversing the top and bottom was repeated 10 times.

Foaming factor = (Volume of coating composition containing generated foam after operation A / Volume of coating composition before operation A (30 mL))
In Examples and Comparative Examples, the following components were used.

[component]
1. Hydrocarbon surfactant dioctyl sulfosuccinate (trade name Aerosol OT-75 (manufactured by Cytec Industries)).

2. Fluorocarbon surfactant Perfluoroalkylethylene oxide adduct (Megafac F-444 (manufactured by DIC Corporation)).

3. Binder component Solid content of acrylic latex (acrylic silicon emulsion G620 (manufactured by Asahi Kasei Chemicals)).

4). Saturated hydrocarbon alcohol ethanol (special grade reagent).

5. Other components 5-1. Hydrophilizing agent: colloidal silica (colloidal silica snowtex O (manufactured by Nissan Chemical Co., Ltd.)).

  5-2. Photocatalyst: Anatase type titanium oxide (ST-01 (manufactured by Ishihara Sangyo Co., Ltd.)).

6). Base material Exterior wall material (Excelse Sera, manufactured by KMEW, water contact angle 98 °)
[Example 1]
100 g of acrylic silicon emulsion G620 (manufactured by Asahi Kasei Chemicals) with a solid content adjusted to 20% by mass, 6 g of a 1% by mass aqueous solution of MegaFac F-444 (manufactured by DIC Corporation), and aerosol OT-75 (manufactured by Cytec Industry Co., Ltd.) A coating composition was obtained by containing 15 g of a 0.1% by mass aqueous solution, 20 g of ethanol, and 59 g of water. The obtained coating composition had a dynamic surface tension of 33 mN / m, a static surface tension of 17 mN / m, and a foaming property of 2 times or less. Therefore, it was found that the obtained coating composition has physical properties within a range that does not cause any problems in coating.

  The obtained coating composition was applied to the outer wall material (Excelse Sera, manufactured by KMEW, water contact angle 98 °) heated to a plate temperature of 100 ° C. by a spray spraying method so as to have a dry film thickness of 1 μm. The appearance of the formed coating film was evaluated after cooling to room temperature. As a result, the coating film was uniform without coating unevenness, and there was no change in the appearance of the outer wall material before and after coating. It was found that the obtained coating composition can be applied satisfactorily.

[Example 2]
A coating composition was obtained in the same manner as in Example 1 except that the content of a 1% by mass aqueous solution of Megafac F-444 (manufactured by DIC Corporation) was changed to 40 g and the content of water was changed to 25 g. The obtained coating composition had a dynamic surface tension of 33 mN / m, a static surface tension of 16 mN / m, and a foaming property of 3 times that was slightly foamed.

  The obtained coating composition was applied to the outer wall material (Excelse Sera, manufactured by KMEW, water contact angle 98 °) heated to a plate temperature of 100 ° C. by a spray spraying method so as to have a dry film thickness of 1 μm. The appearance of the formed coating film was evaluated after cooling to room temperature. As a result, the coating film was uniform without coating unevenness, and there was no change in the appearance of the outer wall material before and after coating. It was found that the obtained coating composition can be applied satisfactorily.

[Example 3]
A coating composition was obtained in the same manner as in Example 1 except that the content of the 0.1 mass% aqueous solution of Aerosol OT-75 (manufactured by Cytec Industry Co., Ltd.) was changed to 4 g and the content of water was changed to 70 g. The obtained coating composition had a dynamic surface tension of 38 mN / m, a static surface tension of 17 mN / m, and a foaming property of 2 times or less. Therefore, it was found that the obtained coating composition has physical properties within a range that does not cause any problems in coating.

  The obtained coating composition was applied to the outer wall material (Excelse Sera, manufactured by KMEW, water contact angle 98 °) heated to a plate temperature of 100 ° C. by a spray spraying method so as to have a dry film thickness of 1 μm. When the appearance of the formed coating film was evaluated after cooling to room temperature, it was satisfactory with no coating unevenness, but a slight change was seen in the appearance of the outer wall material before and after coating. It was found that the obtained coating composition can be applied satisfactorily.

[Example 4]
A coating composition was obtained in the same manner as in Example 1 except that the ethanol content was changed to 50 g and the water content was changed to 29 g. The obtained coating composition had a dynamic surface tension of 32 mN / m, a static surface tension of 17 mN / m, and a foaming property of 2 times or less. Therefore, it was found that the obtained coating composition has physical properties within a range that does not cause any problems in coating.

  The obtained coating composition was applied to the outer wall material (Excelse Sera, manufactured by KMEW, water contact angle 98 °) heated to a plate temperature of 100 ° C. by a spray spraying method so as to have a dry film thickness of 1 μm. The appearance of the formed coating film was evaluated after cooling to room temperature. As a result, the coating film was uniform without coating unevenness, and there was no change in the appearance of the outer wall material before and after coating. It was found that the obtained coating composition can be applied satisfactorily.

[Example 5]
A coating composition was obtained in the same manner as in Example 1 except that ethanol was not contained and the water content was changed to 79 g. The obtained coating composition had a dynamic surface tension of 44 mN / m, a static surface tension of 17 mN / m, and a foaming property of 2 times or less. Therefore, it was found that the obtained coating composition has physical properties within a range that does not cause any problems in coating.

  The obtained coating composition was applied to the outer wall material (Excelse Sera, manufactured by KMEW, water contact angle 98 °) heated to a plate temperature of 100 ° C. by a spray spraying method so as to have a dry film thickness of 1 μm. When the appearance of the formed coating film was evaluated after cooling to room temperature, some unevenness was confirmed in the coating.

[Example 6]
50 g of acrylic silicon emulsion G620 (manufactured by Asahi Kasei Chemicals) with a solid content adjusted to 20% by mass, 50 g of colloidal silica snowtex O (manufactured by Nissan Chemical Co., Ltd.) with a solid content of 20% by mass, MegaFuck F-444 (manufactured by DIC Corporation) A coating composition was obtained by containing 6 g of a 1% by weight aqueous solution, 15 g of a 0.1% by weight aqueous solution of Aerosol OT-75 (manufactured by Cytec Industries), 20 g of ethanol, and 59 g of water. The obtained coating composition had a dynamic surface tension of 33 mN / m, a static surface tension of 17 mN / m, and a foaming property of 2 times or less. Therefore, it was found that the obtained coating composition has physical properties within a range that does not cause any problems in coating.

  The obtained coating composition was applied to the outer wall material (Excelse Sera, manufactured by KMEW, water contact angle 98 °) heated to a plate temperature of 100 ° C. by a spray spraying method so as to have a dry film thickness of 1 μm. The appearance of the formed coating film was evaluated after cooling to room temperature. As a result, the coating film was uniform without coating unevenness, and there was no change in the appearance of the outer wall material before and after coating. It was found that the obtained coating composition can be applied satisfactorily. The water contact angle of the coating film (coating plate) on the outer wall material thus obtained was 45 °, and it was possible to impart hydrophilicity to the coating film.

[Example 7]
50 g acrylic silicon emulsion G620 (made by Asahi Kasei Chemicals) with a solid content adjusted to 20% by mass, 25 g colloidal silica snowtex O (manufactured by Nissan Chemical Co., Ltd.) with a solid content of 20% by mass, anatase type oxidation adjusted to 20% by mass solids Contains 25 g of titanium sol, 6 g of 1% by mass aqueous solution of Megafac F-444 (manufactured by DIC Corporation), 15 g of 0.1% by mass aqueous solution of aerosol OT-75 (manufactured by Cytec Industry), 20 g of ethanol, and 59 g of water To obtain a coating composition. The obtained coating composition had a dynamic surface tension of 33 mN / m, a static surface tension of 17 mN / m, and a foaming property of 2 times or less. Therefore, it was found that the obtained coating composition has physical properties within a range that does not cause any problems in coating.

  The obtained coating composition was applied to the outer wall material (Excelse Sera, manufactured by KMEW, water contact angle 98 °) heated to a plate temperature of 100 ° C. by a spray spraying method so as to have a dry film thickness of 1 μm. The appearance of the formed coating film was evaluated after cooling to room temperature. As a result, the coating film was uniform without coating unevenness, and there was no change in the appearance of the outer wall material before and after coating. It was found that the obtained coating composition can be applied satisfactorily. The water contact angle of the coating film (coating plate) on the outer wall material thus obtained was 59 °, but by irradiating black light with an illuminance of 1 mw / cm 2 for 12 hours, the water contact angle became 0 °. It was possible to impart photocatalytic activity to the coating film.

[Comparative Example 1]
100 g of acrylic silicon emulsion G620 (manufactured by Asahi Kasei Chemicals) with a solid content adjusted to 20% by mass, 15 g of 0.1% by mass aqueous solution of aerosol OT-75 (manufactured by Cytec Industries), 20 g of ethanol, 65 g of water, and paint A composition was obtained. The obtained coating composition had a high dynamic surface tension of 53 mN / m and a static surface tension of 35 mN / m. The foaming property was 2 times or less. Therefore, it was found that the obtained coating composition has physical properties within a range that does not cause any problems in coating.

  The obtained coating composition was applied to the outer wall material (Excelse Sera, manufactured by KMEW, water contact angle 98 °) heated to a plate temperature of 100 ° C. by a spray spraying method so as to have a dry film thickness of 1 μm. About the formed coating film, when the external appearance was evaluated after cooling to room temperature, clear coating unevenness was confirmed. It is thought that coating unevenness occurred due to high dynamic surface tension.

[Comparative Example 2]
100 g of acrylic silicon emulsion G620 (manufactured by Asahi Kasei Chemicals) with a solid content adjusted to 20% by mass, 6 g of a 1% by mass aqueous solution of MegaFac F-444 (manufactured by DIC Corporation), 20 g of ethanol, and 74 g of water, A composition was obtained. The obtained coating composition had a high dynamic surface tension of 50 mN / m, a static surface tension of 17 mN / m, and a foaming property of 2 times or less. Therefore, it was found that the obtained coating composition has physical properties within a range that does not cause any problems in coating.

  The obtained coating composition was applied to the outer wall material (Excelse Sera, manufactured by KMEW, water contact angle 98 °) heated to a plate temperature of 100 ° C. by a spray spraying method so as to have a dry film thickness of 1 μm. About the formed coating film, when the external appearance was evaluated after cooling to room temperature, clear coating unevenness was confirmed. Although the static surface tension is low, it is considered that coating unevenness has occurred due to the high dynamic surface tension.

[Comparative Example 3]
100 g of acrylic silicon emulsion G620 (manufactured by Asahi Kasei Chemicals) with a solid content adjusted to 20% by mass, 6 g of a 1% by mass aqueous solution of MegaFac F-444 (manufactured by DIC Corporation), and aerosol OT-75 (manufactured by Cytec Industry Co., Ltd.) A coating composition was obtained by containing 30 g of a 0.1 mass% aqueous solution, 20 g of ethanol, and 44 g of water. The obtained coating composition had a dynamic surface tension of 33 mN / m and a static surface tension of 17 mN / m. The foaming property was very poor, about 5 times, and it was difficult to paint by spraying.

  The coating composition of the present invention is particularly useful as a coating material for exterior buildings, automobiles, displays, and lenses.

Claims (9)

Water, a hydrocarbon surfactant, a fluorocarbon surfactant, and a binder component, the binder component is contained in the form of a solid content of the polymer water dispersion,
The content of the hydrocarbon surfactant is 0.001% by mass or more and 0.0085% by mass or less, the content of the fluorocarbon surfactant is 0.0001% by mass or more and 0.5% by mass or less, and the binder component The coating composition whose content is 0.1 mass% or more and 50 mass% or less. Further containing saturated hydrocarbon alcohols,
The coating composition according to claim 1, wherein the content of the saturated hydrocarbon alcohol is 5% by mass or more and 40% by mass or less. Saturated hydrocarbon alcohol The coating composition according to claim 2 which is d Chiruaruko Le.   The coating composition according to any one of claims 1 to 3, wherein a dynamic surface tension in 20 milliseconds measured by a maximum bubble pressure method is 45 mN / m or less.   The functional composite containing the coating composition as described in any one of Claims 1-4.   The functional composite_body | complex formed by forming the film | membrane containing the coating composition as described in any one of Claims 1-4 on a base material.   The functional composite according to claim 6, wherein the substrate has a water contact angle at 23 ° C. of 90 ° or more.   The coating method using the coating composition as described in any one of Claims 1-4.   The coating method which coats the coating composition as described in any one of Claims 1-4 on a base material by the spray spraying method.