Coating composition, coating layer forming method, and coating layer

Abstract

To provide a coating layer that is suitable for application to moving bodies such as automobiles, tires, wheels, and window glass, and that has excellent antistatic properties, gloss, antifouling properties, water repellency, durability, running stability, and cost effectiveness. [Solution] The coating composition of the present invention is a coating composition that is applied or sprayed onto a moving body such as an automobile, and contains a binder, a nano-transition metal, an ionic liquid, and water, with the nano-transition metal being 0.0005 to 0.15 wt % and the ionic liquid being 0.05 to 15 wt % in the coating composition.

Description

[Technical Field]

[0001] The present invention relates to a coating composition, a method for forming a coating layer by applying or spraying this coating composition onto a mobile body such as an automobile, and a coating layer formed by applying or spraying this coating composition. [Background technology]

[0002] Conventionally, coating agents containing silicone or siloxane as a main ingredient have been used for the exteriors of moving objects such as automobiles, motorcycles, railway vehicles, heavy machinery, ships, aircraft, agricultural machinery, and construction machinery for the purposes of protection, stain resistance, water repellency, oil repellency, aesthetic improvement, and prevention of fading, and treatments using such coating agents have been widely used.

[0003] On the other hand, we are currently at a turning point in our social structure, and as automobiles and other mobile vehicles are becoming increasingly electrified and smarter, there is a growing trend to replace metal body components with resin materials such as fiber-reinforced plastic (FRP) and carbon-fiber-reinforced plastic (CFRP) for the purposes of improving safety, weight reduction, and fuel efficiency. However, these resin materials accumulate static electricity due to contact and friction between the moving body and air. If the amount of these accumulated particles increases, it may have a negative effect on the electronic circuits of the control system and driving system, and the static electricity itself will act as a resistance to the air, reducing the running performance of the vehicle, such as its running stability. As the trend is for car body components to be made of plastic materials rather than metal materials, it is expected that the amount of static electricity that accumulates will increase compared to the past. Although antistatic coating agents that can suppress these problems have been studied in recent years, they have not yet fully satisfied the driving performance of mobile vehicles, such as their running stability. Furthermore, it is expected that there will be an increasing demand for antistatic coating agents for vehicles that run primarily on electricity, such as electric vehicles (BEVs).

[0004] Furthermore, surfactant-based antistatic agents used to reduce the buildup of static electricity are washed away with water and do not last long, so it was necessary to develop an antistatic function that would last.

[0005] An antistatic coating composition containing a specific amount of a sulfonate salt having a specific structure has been proposed for the purpose of providing excellent antistatic properties and good transparency, and being suitable for coating automobile exteriors and interiors, building materials, mechanical products, electrical products, general household goods, decorative items, etc. (Japanese Patent Laid-Open Publication No. 7-118571).

[0006] Furthermore, a coating composition containing specific amounts of a water-dispersible polyorganosiloxane, a pyridinium salt-based ionic liquid, and water has been proposed for the purpose of providing a coating agent that combines excellent antistatic properties with water repellency and water slippage, and is suitable for application to automobile body components, particularly automobile body components made of resin materials such as plastics and fiber-reinforced plastics (FRP) (Patent Publication No. 7057879). [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 7-118571 [Patent Document 2] Patent No. 7057879 Summary of the Invention [Problem to be solved by the invention]

[0008] The prior art described in Patent Documents 1 and 2 above describes transparency and excellent antistatic properties, but the antistatic coating compositions contain solvents, which makes the coated object susceptible to deterioration, and there are problems such as insufficient antistatic performance.

[0009] In order to solve the above-mentioned problems of the prior art, the present invention aims to solve the above-mentioned problems of the prior art by applying or spraying a coating composition containing specific amounts of a binder, a nano-transition metal, an ionic liquid, and water onto a moving body such as an automobile. [Means for solving the problem]

[0010] The coating composition of the present invention is a coating composition that is applied or sprayed onto a moving body such as an automobile, and is characterized by containing a binder, a nano-transition metal, an ionic liquid, and water, with the nano-transition metal being present in an amount of 0.0005 to 0.15% by weight and the ionic liquid being present in an amount of 0.05 to 15% by weight in the coating composition.

[0011] The coating composition of the present invention is characterized by containing carbon nanotubes or an antistatic agent.

[0012] The coating composition of the present invention is characterized by containing carbon nanotubes and an antistatic agent.

[0013] The coating composition of the present invention is characterized in that the weight ratio of the ionic liquid to the nano-transition metal is 20 / 1 to 300 / 1.

[0014] The method for forming a coating layer of the present invention is characterized in that the coating composition is applied or sprayed onto the surface of a moving body such as an automobile, and the water is evaporated to form a cured coating film.

[0015] The coating composition of the present invention is characterized by being formed by the above-described method for forming a coating layer.

[0016] The coating layer forming method of the present invention is characterized in that the coating composition having a solid content concentration of 15 parts by weight or more is applied or sprayed onto the surface of a moving body such as an automobile, and a cured coating film is formed by volatilizing the water, and then the coating composition having a solid content concentration of less than 15 parts by weight is applied or sprayed onto the surface of the cured coating film, and a cured coating film is formed by volatilizing the water.

[0017] The coating layer of the present invention is characterized by being formed by the above-described method for forming a coating layer. [Effects of the Invention]

[0018] By using the coating composition of the present invention, it is possible to form a coating layer that is suitable for application to moving bodies such as automobiles, tires, wheels, and window glass, and that has excellent antistatic properties, gloss, antifouling properties, water repellency, durability, running stability, and cost-effectiveness. DETAILED DESCRIPTION OF THE INVENTION

[0019] Examples and embodiments of the present invention will be described below, but the present invention is not limited to these in any way.

[0020] The binder of the present invention is used for the purpose of fixing the nano-transition metal and ionic liquid after the coating composition of the present invention is applied or sprayed onto a moving body such as an automobile and dried, and any known binder can be appropriately selected and used depending on the object such as an automobile, etc. Specific examples of binders include water-dispersible silicones and modified silicones.

[0021] The nano-transition metals of the present invention have a high affinity for automobiles and other objects, and are used not only to impart durability and long-lasting properties, but also to impart a metallic sheen to the resulting coating film and provide antistatic and antifouling properties. Furthermore, because the nano-transition metals have the ability to reflect ultraviolet rays, they provide a UV-blocking effect that retards deterioration of vehicle materials caused by ultraviolet rays. There are no particular limitations on the type of nano-transition metal, and the average particle size must be 200 nm or less, with an average particle size of 100 nm or less being preferred, 50 nm or less being more preferred, and 30 nm or less being particularly preferred. Nano-transition metals include nano-silver, nano-platinum, and nano-gold.

[0022] The amount of nano-transition metal in the coating composition of the present invention must be 0.0005 to 0.15 wt%, preferably 0.001 to 0.1 wt%, more preferably 0.003 to 0.08 wt%, and particularly preferably 0.005 to 0.05 wt%. If the amount of nano-transition metal is less than 0.0005 wt%, the antistatic properties, durability / sustainability, antifouling properties, and gloss will be inferior, and the desired effects of the present invention will not be achieved. On the other hand, if the amount of nano-transition metal is more than 0.15 wt%, not only will the cost increase, but color spots and changes in color may occur, which is undesirable.

[0023] The ionic liquid of the present invention is used primarily for the purpose of improving antistatic properties, and the resulting coating film has high image quality and a beautiful appearance. Any known ionic liquid can be used without any particular limitation. Examples of ionic liquids include combinations of a cation selected from imidazolium, pyridinium, ammonium, phosphonium, and combinations thereof with an anion selected from chloride, bromide, iodide, nitrate, hydrogen sulfate, acetate, tetrafluoroborate, hexafluorophosphate, thiocyanate, trifluoromethanesulfonate, bis(trifluoromethylsulfonyl)imide, and combinations thereof, as well as amine salts and amidine-based ionic liquids.

[0024] The amount of ionic liquid in the coating composition of the present invention must be 0.05 to 15 wt%, preferably 0.1 to 10 wt%, more preferably 0.4 to 7 wt%, and particularly preferably 0.7 to 4 wt%. If the amount of ionic liquid is less than 0.05 wt%, the antistatic properties and gloss will be poor, and durability, sustainability, and stain resistance will also be poor, preventing the desired effects of the present invention from being achieved. On the other hand, if the amount of ionic liquid is more than 15 wt%, not only will costs increase, but the coating properties will be poor, reducing workability, the coating film will yellow, and the stain resistance of the coating film may be reduced.

[0025] By combining the above-mentioned binder, nano-transition metal, and ionic liquid, the coating composition of the present invention can achieve even higher affinity for objects such as automobiles, even greater sustainability and durability, and simultaneously exhibit antistatic properties, gloss, and water repellency. Higher antistatic properties have the effect of releasing static electricity that accumulates while driving into the air, which allows wind (air) to flow smoothly over the vehicle body, reducing the burden on the vehicle body while driving and is expected to improve fuel and electricity consumption.

[0026] In the present invention, carbon nanotubes are preferably used for the purpose of imparting conductivity to enhance antistatic properties, improve gloss, and increase penetration and adhesion to the coating film. There are no particular limitations on the carbon nanotubes, and any known carbon nanotubes can be used, but single-walled carbon nanotubes are more preferred in terms of the balance of safety, price, and performance. Since carbon nanotubes are used in the aqueous coating composition of the present invention, water-dispersible types are preferred.

[0027] The amount of carbon nanotubes in the coating composition of the present invention is preferably 0.000005 to 0.02 wt%, more preferably 0.00001 to 0.004 wt%, and particularly preferably 0.00003 to 0.0004 wt%. If the amount of carbon nanotubes is less than 0.000005 wt%, the antistatic properties, gloss, durability, and sustainability are inferior, and the desired effects of the present invention cannot be achieved. On the other hand, if the amount of carbon nanotubes is more than 0.02 wt%, not only will the cost increase, but the coatability will be poor and workability will decrease, and the balance with other ingredients will be poor, which may result in a decrease in the gloss, antistatic properties, water repellency, and stain resistance of the coating film.

[0028] In the present invention, an antistatic agent is preferably used to impart conductivity, thereby enhancing antistatic properties and improving gloss. There are no particular limitations on the antistatic agent, and any known antistatic agent can be used. However, nonionic surfactants are preferred from the standpoints of performance sustainability and safety. The amount of antistatic agent in the coating composition is preferably 0.2 to 10 wt %, more preferably 0.5 to 7 wt %, and particularly preferably 0.7 to 3 wt %. If the amount of antistatic agent is less than 0.2 wt %, antistatic properties and gloss will be poor, and the desired effects of the present invention will not be achieved. On the other hand, if the amount of antistatic agent is more than 10 wt %, not only will costs increase, but the coating properties will be poor and workability will be reduced, and the balance with other ingredients will be poor, which may result in reduced gloss, antistatic properties, water repellency, and stain resistance of the coating film.

[0029] The coating composition of the present invention is effective in improving antistatic properties and gloss by blending the carbon nanotubes or the antistatic agent, but the effects of improving antistatic properties and gloss are significantly enhanced by blending the carbon nanotubes and the antistatic agent simultaneously.

[0030] Furthermore, the coating composition of the present invention has an ionic liquid / nano transition metal weight ratio of 20 / 1 to 300 / 1. If the amount of nano transition metal used is less than 300 / 1, the antistatic function will be reduced, which is undesirable, while if the amount of nano transition metal used is more than 20 / 1, there are disadvantages such as increased costs and photosensitivity and discoloration.

[0031] The coating composition of the present invention is applied or sprayed onto the surface of a mobile body such as an automobile, and then dried to form a coating layer. The coating composition of the present invention can be applied or sprayed onto the surface of a moving body such as an automobile using a conventional method used for aqueous paints, and examples of such methods include application using a sponge, a microfiber cloth, etc. The drying after application may be carried out at room temperature, but it is preferable to allow a curing time of about 1 hour to allow the coating composition of the present invention to penetrate and fix into the coating film on the surface of a mobile body such as an automobile. Of course, the drying may be carried out under heating to shorten the drying time.

[0032] The application or spraying of the coating composition of the present invention to the surface of a moving body such as an automobile produces effects such as antistatic properties, gloss, and durability regardless of the solid content of the coating composition, but these effects can be enhanced by applying multiple layers of coating compositions with different solid content concentrations. For example, by applying or spraying the coating composition of the present invention having a solid content of 15 parts by weight or more to the surface of a moving body such as an automobile and allowing the water to evaporate to form a cured coating film, and then applying or spraying the coating composition having a solid content of less than 15 parts by weight on the surface of the cured coating film and allowing the water to evaporate to form a cured coating film, the properties of the coating formed in the lower layer, such as antistatic properties, gloss, water repellency, antifouling properties, and film thickness, can be maintained for a long period of time.

[0033] The coating composition having a solid content concentration of less than 15 parts by weight is applied to the surface of the coating film, but since the film thickness obtained after drying is thin, the effect does not last long and application is required every few months to every six months. However, the antistatic properties, gloss, and other properties of the coating formed in the lower layer can be maintained for a long period of time.

[0034] Furthermore, after the body of a vehicle or the like is subjected to a surface treatment in advance, the coating film obtained from the coating composition of the present invention applied to the body of a vehicle or the like has a two-layer structure after drying. Specifically, a portion of the fine coating composition components, such as nano-transition metals and carbon nanotubes, that make up the applied coating composition penetrate into the paint on the body of the vehicle or the like and then become fixed. The upper layer of the body is a coating film made of the coating composition.

[0035] Next, the characteristics of the coating composition of the present invention, which contains a water-soluble binder and a relatively small amount of an ionic liquid and a nano-transition metal, will be described. Conventional curable resin paints using siloxanes and the like improve the durability of the coating film by solidifying the liquid, making it difficult to recover the coating several years after it is formed. In contrast, the coating composition of the present invention does not solidify as a liquid, but rather allows some of the fine coating composition components, such as nano-transition metals and carbon nanotubes, that make up the coating composition to penetrate and settle into the paint on the body of a vehicle, etc., so that the original hardness of the coating film is not affected and recovery is easy.

[0036] Conventional curing resin paints using siloxanes and other materials form coating films by solidifying the liquid, which can potentially reduce the functionality of the "self-repairing scratch-resistant coating." The "self-repairing scratch-resistant coating" has the ability to repair scratches in the coating film by softening the coating film under certain conditions. Surprisingly, the coating composition of the present invention can be applied to the "self-repairing scratch-resistant coating" used on automobiles, although the reason is unclear.

[0037] Conventional curable resin paints form a hard coating when the liquid paint hardens, preventing dirt from adhering to car wash sponges and other surfaces during car washing, causing scratches. The coating composition of the present invention has a high antistatic function, which eliminates static electricity accumulated during driving by releasing it into the air, thereby reducing dirt adhesion. Reducing dirt adhesion leads to the effect of preventing dirt from adhering to car wash sponges and other surfaces during car washing, causing scratches. That is, the coating composition of the present invention reduces dirt adhesion by utilizing its high antistatic function, and as a result, has the effect of preventing dirt from sticking to car wash sponges and the like during car washing, causing scratches.

[0038] When a vehicle is driven outdoors, rain, wind, yellow sand, pollen, snow-melting agents, and other contaminants constantly accumulate on the surface of the vehicle, potentially reducing the vehicle's antistatic properties. Furthermore, conventional paint products containing large amounts of wax and silicone tend to produce thick coatings, raising concerns that repeated application of the paint could trap contaminants within the coating. The coating composition of the present invention, with a solids concentration of less than 15 parts by weight, achieves a thin coating by reducing the amount of materials that create thick coatings, such as wax and silicone, and by combining materials that impart antistatic properties, such as ionic liquids and nano-transition metals, thereby restoring the antistatic properties of the vehicle's surface and preventing contaminants from becoming trapped within the coating.

[0039] The coating composition of the present invention having a solid content concentration of less than 15 parts by weight has the following effects. (1) The coating composition has a high antistatic property and is effective in releasing static electricity that accumulates while driving into the air. This effect allows wind (air) to flow smoothly over the vehicle body, reducing the burden on the vehicle body while driving and is expected to improve fuel efficiency. (2) A hardened coating (cured resin paint) has the effect of reducing scratches caused by car washes with its hard coating, but the coating composition improves the antistatic function, thereby reducing deterioration of the coating surface layer caused by external factors such as rain, iron powder, snow-melting agents, and salt damage, which are unavoidable when driving outdoors, and at the same time, making the car less likely to get dirty and reducing scratches caused by car washes. (3) For automobiles and other vehicles driven outdoors, external factors such as rain, dust, pollen, yellow sand, and salt damage make it difficult to maintain the gloss and other effects of coatings on the surface of the vehicle, even after application. The coating composition can stably maintain the gloss, water repellency, and antistatic properties of the vehicle surface. By applying the coating composition to the vehicle body during daily car washes, the "water repellency," "static elimination," "soil resistance," "gloss maintenance," and "driving stability" can be restored, and the surface can be maintained in a constantly updated condition. (4) Conventional maintenance agents that are applied during daily car washes have the problem of creating a mille-feuille-like effect, trapping dirt by applying additional layers on top of the existing dirt. The coating composition minimizes the use of silicones and waxes to prevent the coating from becoming too thick, and is primarily composed of ionic liquids, nano-transition metals, and antistatic agents, thereby improving this problem by preserving the beauty of the paint without the need for surface preparation. (5) One of the effects of coatings applied to automobiles, etc., is the water-repellent function, but a problem has been that droplets of water from tap water or rain can dry and become stains such as water spots. The coating composition, which mainly contains ionic liquids, nano-transition metals, and antistatic agents, has been improved to alleviate this problem. (6) While conventional coating agents mainly use silicone or wax to impart gloss, the coating composition can impart gloss using ionic liquids and nano-transition metals. [Example]

[0040] Examples of the present invention will be shown below, but the present invention is not limited to these examples.

[0041] Example 1 2 parts by weight of MC-FMA05 (manufactured by Goko Chemical Industry Co., Ltd.) as an ionic liquid, 2 parts by weight of Nanopure PR-WB14R (manufactured by Nippon Ion Co., Ltd., concentration 1 wt%) as a nano-transition metal, 71 parts by weight of P2003 (manufactured by Asahi Kasei Silicone Co., Ltd., concentration 30 wt%) as a binder, 10 parts by weight of a 200-fold diluted solution of Lamfil WPB-030 (manufactured by Kusumoto Chemical Co., Ltd., concentration 0.4 wt%) as carbon nanotubes, and 15 parts by weight of Virinone W (manufactured by Avanti Co., Ltd., concentration 10 wt%) as an antistatic agent were weighed and mixed in a plastic cup. The solids concentration of the prepared coating composition was 24.9 wt%, and the weight ratio of ionic liquid to nano-transition metal was 100 / 1.

[0042] [Surface resistivity] The prepared coating composition was applied to a transparent acrylic plate (100 mm x 100 mm) with a thickness of 3 mm using a microfiber cloth, wiped off with a new microfiber cloth, and then dried indoors for 48 hours to obtain a test piece for evaluation.

[0043] The obtained test specimen for evaluation was left to stand for 5 days in a room at a temperature of 23°C and a humidity of 50% RH, and then the surface resistivity was measured in accordance with JIS 6911. Specifically, the test specimen was attached to an ADVANTEST RESISTIVITY CHAMBER R12702A chamber in a room at a temperature of 23°C and a humidity of 50% RH, and the surface resistivity was measured using an ADVANTTEST R8340A ULTRA HIGH RESISTANCE METER by contacting a metal double ring with the coating surface of the test specimen using the double ring method. The resulting measured value was 1.543 x 10 8 The surface resistivity calculated according to the formula of the above device (measured value x 18.84) is 3 x 10 9 (Ω / □), and the antistatic properties were excellent.

[0044] [Gloss, stain resistance, film thickness] The coating composition prepared above was applied to the exterior body of a car using a microfiber cloth and then allowed to dry for one hour. The car was then washed with water and wiped dry with a new microfiber cloth. The car was then stored in an open-air parking lot and driven on public roads and highways. After one year, the condition of the coating was visually evaluated for gloss, anti-fouling properties, and film thickness. The results showed that the gloss was excellent, with the gloss maintained. The anti-fouling properties were excellent, with no noticeable stains. The coloring of the coated area had a deep feel to the color and an excellent film thickness. Evaluation criteria: ◎ = very good, 〇 = slightly good, △ = good, × = poor, XX = very bad, very poor

[0045] [Water repellency] The coating composition of the present invention was applied to the exterior body of an automobile in the same manner as described above, and the automobile was parked and driven for one year. After that, the water repellency was evaluated by the state of water droplets attached to the hood of the automobile immediately after a water shower was performed on the hood of the automobile. As a result, the attached water droplets were nearly spherical, and the water repellency was very excellent. Evaluation criteria: ◎ = very good, 〇 = slightly good, △ = good, × = poor, XX = very poor

[0046] [Sustainability] The coating composition of the present invention was applied to the exterior body of a car in the same manner as above, and an uncoated car was also uncoated. After parking and driving the car for three years, the gloss, antifouling properties, film thickness, and water repellency of the coated and uncoated car exteriors were compared and evaluated. As a result, the coated car exterior was far superior to the uncoated car in gloss, antifouling properties, film thickness, water repellency, and driving stability. Evaluation criteria: ◎ = very good after coating, ◯ = somewhat good after coating, △ = good after coating, × = poor after coating, XX = very bad after coating

[0047] [Cost-effectiveness] The cost-effectiveness of the coating composition of the present invention was estimated based on the cost and effect of a commercially available general-purpose automotive coating solution. As a result, the antistatic property, gloss, antifouling property, film thickness, water repellency, and durability were all excellent and highly effective, and the cost-effectiveness was very good. Evaluation criteria: ◎ = very good, 〇 = slightly good, △ = good, × = poor, XX = very poor

[0048] Comparative Example 1 A coating composition was prepared and evaluated in exactly the same manner as in Example 1, except that the Nanopure PR-WB14R used in Example 1 was not blended and 2 parts by weight of water was added instead. The surface resistivity was unmeasurable, and no antistatic performance was exhibited. The gloss and antifouling properties were very dirty, the film thickness was poor, and the water repellency and durability were somewhat excellent. Furthermore, although the cost was lower because Nanopure PR-WB14R was not blended, the effect was small and the cost-effectiveness was poor.

[0049] Example 2, Example 3, Example 5 to Example 11, Example 13 to Example 16 Coating compositions were prepared and evaluated in exactly the same manner as in Example 1, except that the ionic liquid (MC-FMA05, manufactured by Goko Chemical Industry Co., Ltd.), nano transition metal (Nano Pure PR-WB14R, manufactured by Nippon Ion Co., Ltd.), binder (P2003, manufactured by Wacker Asahi Kasei Silicone Co., Ltd.), carbon nanotubes (Lamfil WPB-030, manufactured by Kusumoto Chemical Co., Ltd.), and antistatic agent (Birinone W, manufactured by Avanti Co., Ltd.) used in Example 1 were used in amounts shown in Tables 1 and 2. The evaluation results are shown in Tables 1 and 2.

[0050] Example 4 A coating composition was prepared and evaluated in exactly the same manner as in Example 1, except that the carbon nanotubes (Lamfil WPB-030, manufactured by Kusumoto Chemicals Co., Ltd.) and antistatic agent (Birinone W, manufactured by Avanti Co., Ltd.) used in Example 1 were not used and the amount of binder (P2003, manufactured by Wacker Asahi Kasei Silicones Co., Ltd.) used was changed. The evaluation results are shown in Table 1, and since carbon nanotubes and an antistatic agent were not used, the gloss, stain resistance, and durability were excellent.

[0051] Example 12 A coating composition was prepared and evaluated in exactly the same manner as in Example 1, except that the amounts of ionic liquid (MC-FMA05, manufactured by Goko Chemical Industry Co., Ltd.), nano transition metal (Nano Pure PR-WB14R, manufactured by Nippon Ion Co., Ltd.), and binder (P2003, manufactured by Wacker Asahi Kasei Silicones Co., Ltd.) used in Example 1 were changed as shown in Table 1. The evaluation results are shown in Table 2. Perhaps because the amounts of ionic liquid and nano silver used were small, the performance was inferior to that of Example 1, but the antistatic properties were excellent, and the gloss, antifouling properties, film thickness, water repellency, durability, and cost-effectiveness were excellent.

[0052] Examples 17 and 18 The ionic liquid (MC-FMA05, manufactured by Goko Chemical Industries, Ltd.) used in Example 1 was replaced with 0.7 parts by weight (4 parts by weight in Example 18) of Sanelec CP-150, a special amidine compound (manufactured by Sanyo Chemical Industries, Ltd., concentration 35% by weight), and the other components were the same as those used in Example 1, used in the amounts shown in Table 3. The results are shown in Table 3.

[0053] Examples 19 and 20 The ionic liquid used in Example 1 (MC-FMA05, manufactured by Goko Chemical Industry Co., Ltd.) was replaced with 0.7 parts by weight (4 parts by weight in Example 20) of ammonium salt GS anti-static IL AH-31FES (manufactured by GS Alliance Co., Ltd.), and the remaining components were the same as those used in Example 1, in the amounts shown in Table 3. The results are shown in Table 3.

[0054] Examples 21 and 22 Instead of Nanopure PR-WB14R (manufactured by Nippon Ion Co., Ltd.) used in Example 1, 0.7 parts by weight (4 parts by weight in Example 22) of nanoplatinum dispersion liquid PTS-WM1000 (manufactured by Nippon Ion Co., Ltd.) was used, and the other components were the same as those used in Example 1, in the amounts shown in Table 3. The results are shown in Table 3.

[0055] Comparative Example 2 A coating composition was prepared and evaluated in exactly the same manner as in Example 1, except that the ionic liquid MC-FMA05 used in Example 1 was not blended and 2 parts by weight of water was added instead. The surface resistivity was unmeasurable, and no antistatic performance was exhibited. The gloss and antifouling properties were very dirty, the film thickness was very poor, the water repellency was somewhat good, and the durability was poor. Furthermore, although the cost was lower because MC-FMA05 was not blended, the effect was small and the cost-effectiveness was poor.

[0056] Comparative Example 3 A coating composition was prepared and evaluated in exactly the same manner as in Example 1, except that the Nanopure PR-WB14R and ionic liquid MC-FMA05 used in Example 1 were not blended and 4 parts by weight of water was added instead. The surface resistivity was unmeasurable, and no antistatic performance was exhibited. The gloss and antifouling properties were very dirty, the film thickness was very poor, the water repellency was somewhat good, and the durability was very poor. Furthermore, although the cost was lower because Nanopure PR-WB14R and MC-FMA05 were not blended, the effect was very small and the cost-effectiveness was very poor.

[0057] Comparative Example 4 A coating composition was prepared and evaluated in exactly the same manner as in Example 1, except that the binder P2003 used in Example 1 was not blended and 71 parts by weight of water was added instead. The surface resistivity was unmeasurable, and no antistatic performance was exhibited. The gloss and antifouling properties were very poor, the film thickness was very poor, and the water repellency and durability were very poor. Furthermore, the effect was extremely small, and the cost-effectiveness was very poor.

[0058] Comparative Example 5 A coating composition was prepared and evaluated in exactly the same manner as in Example 1, except that the Nanopure PR-WB14R, ionic liquid MC-FMA05, and binder P2003 used in Example 1 were not blended, and 75 parts by weight of water was added instead. The surface resistivity was unmeasurable, and no antistatic performance was exhibited. The gloss and antifouling properties were very poor, the film thickness was very poor, and the water repellency and durability were very poor. Furthermore, the effect was extremely small, and the cost-effectiveness was very poor.

[0059] Comparative Examples 6 to 9 Coating compositions were prepared and evaluated in exactly the same manner as in Example 2, except that the amounts of ionic liquid MC-FMA05, nano transition metal nanopure PR-WB14R, and binder P2003 used in Example 2 were changed to those shown in Table 3. The evaluation results are shown in Table 6.

[0060] Comparative Example 10 A coating composition was prepared and evaluated in exactly the same manner as in Example 2, except that the nano-transition metal nanopure PR-WB14R used in Example 2 was replaced with silver ion concentrate SILVION N (manufactured by Nippon Ion Co., Ltd., concentration 1 wt%). The surface resistivity was unmeasurable, and no antistatic performance was exhibited. The gloss and antifouling properties were very poor, the film thickness was very poor, and the water repellency and durability were very poor. Furthermore, the effect was extremely small, and the cost-effectiveness was very poor.

[0061] Comparative Example 11 A coating composition was prepared and evaluated in exactly the same manner as in Example 2, except that the nano-transition metal nanopure PR-WB14R used in Example 1 was replaced with a silver ion concentrate SILVION N (manufactured by Nippon Ion Co., Ltd., concentration 1 wt%). The results are shown in Table 6.

[0062] Comparative Examples 12 to 15 Coating compositions were prepared and evaluated in exactly the same manner as in Example 1, except that the amounts of ionic liquid MC-FMA05 and nano transition metal nanopure PR-WB14R used in Example 1 were changed to those shown in Table 4. The results are shown in Table 7, but compositions in which the amounts of ionic liquid MC-FMA05 and nano transition metal nanopure PR-WB14R used were outside the ranges of the present invention had very poor performance or were not practical due to high production costs.

[0063] Comparative Examples 16 to 19 Coating compositions were prepared and evaluated in exactly the same manner as in Example 2, except that the amounts of ionic liquid MC-FMA05 and nano transition metal nanopure PR-WB14R used in Example 2 were changed to those shown in Table 7. The results are shown in Table 7.

[0064] Example 23 The coating composition prepared in Example 2 was applied to the material to be evaluated, dried, wiped off or washed with water, and then dried in sequence. The coating composition was prepared in exactly the same manner as in Example 1, except that the ionic liquid (manufactured by Goko Chemical Industry Co., Ltd., MC-FMA05), nano transition metal (manufactured by Nippon Ion Co., Ltd., Nanopure PR-WB14R), binder (manufactured by Asahi Kasei Silicone Co., Ltd., P2003), carbon nanotube (manufactured by Kusumoto Chemical Co., Ltd., Lamfil WPB-030) and antistatic agent (manufactured by Avanti Co., Ltd., Billinon W) used in Example 1 were used in the amounts shown in Table 4. The evaluation results are shown in Table 4.

[0065] Examples 24 to 27 A coating composition was prepared and evaluated in exactly the same manner as in Example 23, except that the amounts of the ionic liquid (MC-FMA05, manufactured by Goko Chemical Industry Co., Ltd.), nano transition metal (Nano Pure PR-WB14R, manufactured by Nippon Ion Co., Ltd.), binder (P2003, manufactured by Wacker Asahi Kasei Silicone Co., Ltd.), carbon nanotubes (Lamfil WPB-030, manufactured by Kusumoto Chemical Co., Ltd.), and antistatic agent (Birinone W, manufactured by Avanti Co., Ltd.) used in Example 23 were changed to those shown in Table 4. The results are shown in Table 4.

[0066] Comparative Example 20 The coating composition prepared in Example 2 was applied to the material to be evaluated, dried, wiped off or washed with water, and then dried in that order. A coating composition was then prepared and evaluated in exactly the same manner as in Example 23, except that the ionic liquid (MC-FMA05, manufactured by Goko Chemical Industry Co., Ltd.) used in Example 23 was not added, and 1 part by weight of water was added instead. The evaluation results are shown in Table 8.

[0067] Comparative Examples 21 to 26 A coating composition was prepared and evaluated in exactly the same manner as in Example 23, except that the amounts of the ionic liquid (MC-FMA05, manufactured by Goko Chemical Industry Co., Ltd.), nano transition metal (Nano Pure PR-WB14R, manufactured by Nippon Ion Co., Ltd.), binder (P2003, manufactured by Asahi Kasei Wacker Silicone Co., Ltd.), carbon nanotubes (Lamfil WPB-030, manufactured by Kusumoto Chemical Co., Ltd.), water, and antistatic agent (Birinone W, manufactured by Avanti Co., Ltd.) used in Example 23 were changed to those shown in Table 8. The results are shown in Table 8.

[0068] [Table 1]

[0069] [Table 2]

[0070] [Table 3]

[0071] [Table 4]

[0072] [Table 5]

[0073] [Table 6]

[0074] [Table 7]

[0075] [Table 8] [Industrial Applicability]

[0076] According to the present invention, it is possible to provide a coating layer that is suitable for application to moving bodies such as automobiles, tires, wheels, and window glass, and that has excellent antistatic properties, gloss, antifouling properties, water repellency, durability, running stability, and cost-effectiveness.

Claims

1. A coating composition to be applied or sprayed onto automobiles and tires, wheels, window glass, motorcycles, railroad vehicles, heavy machinery, ships, aircraft, agricultural machinery, and construction machinery, A coating composition comprising a binder, a nano-transition metal, an ionic liquid, and water, wherein the nano-transition metal is present in an amount of 0.0005 to 0.15 wt % and the ionic liquid is present in an amount of 0.05 to 15 wt %, and the nano-transition metal is nano-silver and nano-platinum.

2. The coating composition of claim 1, further comprising carbon nanotubes or an antistatic agent.

3. The coating composition of claim 1 comprising carbon nanotubes and an antistatic agent.

4. 4. The coating composition according to claim 1, wherein the weight ratio of the ionic liquid to the nano-transition metal is 20 / 1 to 300 / 1.

5. A method for forming a coating layer, comprising applying or spraying the coating composition according to any one of claims 1 to 3 onto a surface of an automobile and tire, wheel, window glass, motorcycle, railway vehicle, heavy machinery, ship, aircraft, agricultural machinery, or construction machinery, and then volatilizing the water to form a cured coating film.

6. A coating layer formed from the coating composition described in any one of claims 1 to 3.

7. A method for forming a coating layer, comprising applying or spraying the coating composition according to any one of claims 1 to 3, having a solids concentration of 15 parts by weight or more, onto a surface of an automobile and tire, wheel, window glass, two-wheeled vehicle, railway vehicle, heavy machinery, ship, aircraft, agricultural machinery, or construction machinery, and allowing the water to volatilize to form a cured coating film, and applying or spraying the coating composition according to any one of claims 1 to 3, having a solids concentration of less than 15 parts by weight, onto the surface of the cured coating film, and allowing the water to volatilize to form a cured coating film.

8. A coating layer formed from the coating composition according to any one of claims 1 to 3, having a solid content concentration of 15 parts by weight or more.

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