Vehicle exterior component

Abstract

To provide an exterior component for a vehicle capable of suppressing adhesion of mud to a surface of a coating layer.SOLUTION: The lower garnish 17 includes a base member 20, which is formed from a plastic material, and a coating layer 21, which is formed on the 20a of the base member 20. Surface free energy of the 21a of the coating layer 21 is 20mJ / m2 or more and 45mJ / m2 or less.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an exterior part for a vehicle. [Background technology]

[0002] Patent Document 1 describes a transparent resin member for use in a vehicle. This transparent resin member has a resin base and a water-repellent layer formed on the surface of the resin base. The surface of the water-repellent layer is provided with a plurality of convex portions that are spaced apart from one another and distributed in a sea-island pattern.

[0003] In such a member, a large amount of air can be held between the protrusions, and therefore high water repellency is achieved. Patent Document 2 describes a member having a substrate and a surface layer formed on the substrate surface. The surface layer contains silicone and a water-repellent fluororesin. The weight of the water-repellent fluororesin is 50 to 99% of the total weight of the silicone and the water-repellent fluororesin.

[0004] The surface layer of such components exhibits super-water repellency, equivalent to a contact angle with water of 150° or more, making it suitable for use in components that require surface washability with running water, such as vehicle exteriors and paintwork and vehicle lamp covers. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2020-66181 [Patent Document 2] Japanese Patent Application Publication No. 10-316820 Summary of the Invention [Problem to be solved by the invention]

[0006] However, when a conventional water-repellent coating layer including such a water-repellent layer and a surface layer is applied to an exterior part of a vehicle, the following problems arise. For example, if multiple protrusions have high water repellency, when muddy water splashes on the surface of the exterior part while the vehicle is running, the mud will easily get in between the protrusions. Furthermore, the mud that gets into the tiny gaps between the protrusions is difficult to remove even when washed with water.

[0007] Furthermore, when high water repellency is achieved by including fluorine, if muddy water containing silicon dioxide (e.g., Kanto loam mud) splashes onto the surface of an exterior product, the mud is likely to remain attached to the surface of the exterior product due to the large bond energy between silicon dioxide and fluorine. In this case, the mud that has adhered to the surface is difficult to remove even when washed with water.

[0008] Therefore, there is room for improvement in terms of suppressing adhesion of mud to the surface of the coating layer. [Means for solving the problem]

[0009] Various aspects of vehicle exterior accessories for solving the above problems will be described below. [Aspect 1] A substrate made of a resin material and a coating layer formed on the surface of the substrate, wherein the surface free energy of the coating layer is 20 mJ / m 2 More than 45mJ / m 2 The following are exterior vehicle parts:

[0010] Generally, the smaller the surface free energy of a coating layer, the more water-repellent the coating layer becomes. This makes it difficult for muddy water to adhere to the coating layer. On the other hand, if the surface free energy of the coating layer is 20 mJ / m 2 If the thickness is smaller than 100 μm, the water repellency of the coating layer becomes too high, and once mud adheres to the coating layer, it becomes difficult to remove the mud when washing with water.

[0011] In this regard, according to the above configuration, the surface free energy of the coating layer is 20 mJ / m 2 As a result, even if the surface free energy of the coating layer is reduced, it is possible to prevent mud from becoming difficult to remove when washed with water.

[0012] Generally, the higher the surface free energy of the coating layer, the lower the water repellency of the coating layer. This makes it easier for muddy water to adhere to the coating layer, and water adheres to the coating layer during cleaning and becomes difficult to remove. In particular, when the surface free energy of the coating layer is 45 mJ / m 2 If the value is set to be larger than , a large amount of muddy water will adhere to the coating layer, and most of the water that adheres to the coating layer during cleaning will be difficult to drop off. As a result, a large amount of mud and water from cleaning will remain attached to the coating layer and will be difficult to drop off.

[0013] In this regard, according to the above configuration, the surface free energy of the coating layer is 45 mJ / m 2 This prevents muddy water from adhering to the coating layer, and also makes it easier for water to fall off together with the mud during cleaning.

[0014] For this reason, by setting the surface free energy of the coating layer within the above range, adhesion of mud to the surface of the coating layer can be suppressed. [Aspect 2] The vehicle exterior part according to [Aspect 1], wherein the water sliding angle on the surface of the coating layer is 30° or less.

[0015] According to the above-mentioned configuration, the antifouling property is improved, and therefore, adhesion of mud to the surface of the coating layer can be further suppressed. [Aspect 3] The vehicle exterior part according to [Aspect 2], wherein the sliding angle on the surface of the coating layer is 15° or less.

[0016] According to the above-mentioned configuration, the antifouling property is further improved, and therefore adhesion of mud to the surface of the coating layer can be further suppressed. [Aspect 4] The vehicle exterior part according to any one of [Aspect 1] to [Aspect 3], wherein the vehicle exterior part is a lower garnish attached to the front of the vehicle.

[0017] The lower garnish attached to the front of the vehicle is prone to getting splashed with muddy water when the vehicle is moving, which makes the problem of mud adhering to the surface of the lower garnish even more pronounced. In this regard, the above configuration can suitably prevent mud from adhering to the surface of the lower garnish. [Effects of the Invention]

[0018] According to the present invention, adhesion of mud to the surface of the coating layer can be suppressed. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a front view showing the front part of a vehicle having a lower garnish as an embodiment of a vehicle exterior accessory. [Figure 2] FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. [Figure 3] FIG. 3 is a diagram illustrating the procedures for the mud adhesion test and the cleaning test. [Figure 4] FIG. 4 is a graph showing the relationship between surface free energy and sliding angle for the examples and comparative examples. DETAILED DESCRIPTION OF THE INVENTION

[0020] An embodiment of a vehicle exterior accessory will be described below with reference to Figures 1 and 2. In this embodiment, the present invention is embodied as a front lower garnish (hereinafter referred to as lower garnish 17) attached to the front of an automobile 10.

[0021] <Lower Garnish 17> As shown in FIG. 1, a bumper cover 12 is provided at the front of an automobile 10. The bumper cover 12, together with the pair of headlamps 11, mainly constitutes the front face 10a of the automobile 10, and is fixed to the body (not shown) of the automobile 10.

[0022] The bumper cover 12 has an upper cover portion 13 that forms the upper part and a lower cover portion 14 that forms the lower part. A front grille 15 is attached to the upper cover portion 13.

[0023] A lower grille 16 is attached to the lower cover portion 14. A lower garnish 17 is attached to the lower end portion of the lower cover portion 14 as a cover for covering that portion.

[0024] As shown in FIGS. 1 and 2, the lower garnish 17 is intended to prevent mud and sand from adhering to the lower cover portion 14 and the lower grille 16, and includes a base material 20 and a coating layer 21.

[0025] <Base material 20> The base material 20 is formed into a flat plate shape by injection molding a synthetic resin material. Examples of resin materials that can be used to form the substrate 20 include (poly)styrene resins such as acrylonitrile-butadiene-styrene copolymer (ABS) resin, acrylic resins such as polypropylene (PP) and polymethyl methacrylate (PMMA), general-purpose plastics such as polyurethane (PU) and polyvinyl chloride (PVC), engineering plastics such as polycarbonate (PC) and modified polyphenylene ether resin (m-PPE), and polymer alloys such as PC / ABS alloys that combine the above resins.

[0026] <Coating layer 21> The coating layer 21 provides the lower garnish 17 with antifouling properties, and is provided on the surface 20a of the base material 20.

[0027] The coating layer 21 is formed, for example, by applying a resin composition to the surface 20a to form a coating film, and then drying and curing the coating film. As the coating method, known methods such as spray coating, die coating, flow coating, curtain coating, bar coating, and dip coating can be used.

[0028] The resin material contained in the resin composition may be a resin material contained in a known synthetic resin paint such as an acrylic resin, a urethane resin, an epoxy resin, a silicone resin, a polyester resin, a melamine resin, etc. From the viewpoint of improving antifouling properties, weather resistance, and scratch resistance, it is preferable to use an acrylic resin or a silicone resin as the resin material.

[0029] The resin composition preferably contains a fluororesin or a fluorine-based additive from the viewpoint of improving water repellency, whereas the resin composition preferably does not contain a fluororesin or a fluorine-based additive from the viewpoint of suppressing adhesion of mud containing silicon dioxide as a component, such as Kanto loam mud.

[0030] If necessary, the coating layer 21 may include a hard coat layer formed by applying a known hard coat agent to the surface 20a of the substrate 20. In this case, the resin composition described above may be applied to the surface of the hard coat layer to form a coating film. Examples of hard coat agents include organic hard coat agents such as acrylate-based, oxetane-based, and silicone-based hard coat agents, inorganic hard coat agents, and organic-inorganic hybrid hard coat agents.

[0031] The surface 21a of the coating layer 21 has water repellency. In other words, the lower limit θ° of the contact angle between the surface 21a of the coating layer 21 and water is approximately 90° (θ°≈90°). On the other hand, from the viewpoint of improving antifouling properties, it is preferable that the surface 21a does not have super-water repellency achieved by a fine uneven structure.

[0032] The surface free energy of the surface 21a of the coating layer 21 is 20 mJ / m 2 More than 45mJ / m 2 From the viewpoint of improving the antifouling property, the surface free energy of the surface 21a is 20 mJ / m or less. 2 More than 30mJ / m 2 It is preferable that:

[0033] The sliding angle of water on the surface 21a of the coating layer 21 is 30° or less. From the viewpoint of improving antifouling properties, the sliding angle of water on the surface 21a is preferably 15° or less. The contact angle, surface free energy, and water sliding angle on the surface 21a of the coating layer 21 are measured as described in the examples below.

[0034] <Effects of this embodiment> Next, the effects of this embodiment will be described. (1) The surface free energy of the surface 21a of the coating layer 21 is 20 mJ / m 2 More than 45mJ / m 2 The following is the result.

[0035] Generally, the smaller the surface free energy of the coating layer 21, the more water-repellent the coating layer 21 becomes. Therefore, muddy water is less likely to adhere to the surface 21a of the coating layer 21. On the other hand, when the surface free energy of the coating layer 21 is 20 mJ / m 2 If the thickness is smaller than 1 / 2 mm, the water repellency of the coating layer 21 becomes too high, and once mud adheres to the coating layer 21, the mud is difficult to remove when washed with water.

[0036] In this regard, according to the above configuration, the surface free energy of the coating layer 21 is 20 mJ / m 2 As a result, even if the surface free energy of the coating layer 21 is reduced, it is possible to prevent mud from becoming difficult to remove when washed with water.

[0037] Generally, the greater the surface free energy of the coating layer 21, the lower the water repellency of the coating layer 21. Therefore, muddy water is more likely to adhere to the surface 21a of the coating layer 21, and water adheres to the surface 21a during cleaning and is less likely to fall off. In particular, when the surface free energy of the coating layer 21 is 45 mJ / m 2If the value is set to be larger than the above, a large amount of muddy water will adhere to the surface 21a, and most of the water that adheres to the surface 21a during cleaning will be difficult to drop off. As a result, a large amount of mud and water from cleaning will remain attached to the surface 21a and will be difficult to drop off.

[0038] In this regard, according to the above configuration, the surface free energy of the coating layer 21 is 45 mJ / m 2 This prevents muddy water from adhering to the surface 21a of the coating layer 21, and also makes it easier for water to fall off together with the mud during cleaning.

[0039] Therefore, by setting the surface free energy of the coating layer 21 within the above range, adhesion of mud to the surface 21a of the coating layer 21 can be suppressed. (2) The water sliding angle on the surface 21a of the coating layer 21 is 30° or less.

[0040] This configuration improves the antifouling properties of the surface 21a, thereby further preventing mud from adhering to the surface 21a of the coating layer 21. (3) The water sliding angle on the surface 21a of the coating layer 21 is 15° or less.

[0041] This configuration further enhances the antifouling properties of the surface 21a, thereby further preventing mud from adhering to the surface 21a of the coating layer 21. (4) The vehicle exterior part is a lower garnish 17 attached to the front of the automobile 10.

[0042] The lower garnish 17 attached to the front of the automobile 10 is susceptible to muddy water splashing on its surface (surface 21a of the coating layer 21) when the automobile 10 is traveling. This makes the problem of mud adhering to the surface of the lower garnish 17 even more pronounced.

[0043] In this regard, the above-described configuration can suitably prevent mud from adhering to the surface of the lower garnish 17. <Example of change> This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility.

[0044] The vehicle exterior part according to the present invention is not limited to the lower garnish 17, but can also be embodied as an exterior part that constitutes the front outer shell of the automobile 10, such as the bumper cover 12 (particularly the lower cover portion 14), a skid plate, a front spoiler, or a front diffuser.

[0045] The vehicle exterior accessory according to the present invention is not limited to an exterior accessory that constitutes the outer shell of the front part of the automobile 10. For example, it can be embodied as an exterior accessory such as a fender, overfender, or side spoiler that constitutes the outer shell of the side part of the automobile 10. It can also be embodied as an exterior accessory such as a rear bumper cover that constitutes the outer shell of the rear part of the automobile 10.

[0046] The vehicle exterior accessory according to the present invention may be disposed in front of an infrared sensor, or may be embodied as a sensor cover that is integral with the infrared sensor. The vehicle exterior accessory according to the present invention is not limited to being applied to the automobile 10, but may be applied appropriately to any part that constitutes the outer shell of the vehicle. [Example]

[0047] The above embodiment will be described in more detail below with reference to examples and comparative examples. [Sample preparation] Each sample of the examples and comparative examples was prepared as follows.

[0048] Example 1 A PC plate (thickness: 3 mm) was prepared using PC (Panlite® L1225Z-100, manufactured by Teijin Limited) as the substrate. A silicone-based hard coating agent (SilFORT® PHC587C2 Clear Coat) manufactured by Momentive Performance Materials was spray-coated onto the surface of the substrate, followed by drying and curing to form a hard coating layer (thickness: 10-20 μm). Next, a silicone-based water repellent manufactured by SNT was spray-coated onto the surface of the hard coating layer, followed by drying and curing to form a coating film (thickness: 200-700 nm). This resulted in a sample having a coating layer consisting of two layers, a hard coating layer and the above coating film, formed on the surface of the substrate.

[0049] Example 2 A silicone-based hard coating agent (SilFORT® AS4700) manufactured by Momentive Performance Materials was spray-coated onto the surface of a substrate prepared in the same manner as in Example 1, and then dried and cured to obtain a sample in which a coating layer (thickness: 10-20 μm) was formed on the surface of the substrate.

[0050] Example 3 A sample was obtained in the same manner as in Example 2, except that an acrylic hard coating agent (SilFORT® UVHC5000) manufactured by Momentive Performance Materials was used instead of the hard coating agent used in Example 2.

[0051] Example 4 A sample was obtained in the same manner as in Example 2, except that a silicone-based hard coating agent (SilFORT (registered trademark) PHC587C2 Clear Coat) manufactured by Momentive Performance Materials was used instead of the hard coating agent used in Example 2.

[0052] (Comparative Example 1) A super water-repellent film (Leafy (registered trademark)) manufactured by Soken Chemical & Engineering Co., Ltd., which had been prepared in advance as a film, was laminated on the surface of a substrate prepared in the same manner as in Example 1 to obtain a sample.

[0053] (Comparative Example 2) A resin composition was prepared by adding a fluorine-based antifouling additive (KY-1200 series, manufactured by Shin-Etsu Chemical Co., Ltd.) to an acrylic hard coating agent (FUJIHARD [registered trademark] HH3401U) manufactured by Fujikura Chemical Co., Ltd. A sample was obtained in the same manner as in Example 2, except that the above resin composition was used instead of the hard coating agent of Example 2.

[0054] (Comparative Example 3) A sample was obtained in the same manner as in Example 2, except that an acrylic hard coat (FUJIHARD (registered trademark) HH3401U) manufactured by Fujikura Kasei Co., Ltd. was used instead of the hard coat agent of Example 2.

[0055] Comparative Example 4 An ordinary sheet glass (800 mm x 800 mm x 11 mm) was prepared. [Measurement method] <Contact angle, surface free energy> The contact angle and surface free energy of each sample of the examples and comparative examples were measured as follows.

[0056] A fully automatic contact angle meter (DMo-501, manufactured by Kyowa Interface Science Co., Ltd.) was used for the measurements. At 23°C, approximately 2 μL of ion-exchanged water was dropped onto the surface of each sample, and the contact angle (contact angle) between the surface of each sample and the ion-exchanged water (water) was measured. Contact angles were also measured for diiodomethane and ethylene glycol (EG) in the same way. Next, the surface free energy (mJ / m 2 ) was calculated using the Kitazaki-Hata theoretical formula. The contact angle (°) and surface free energy (mJ / m 2 ) are shown in Table 1.

[0057] <Fall angle> The water sliding angle on the surface of each sample of the examples and comparative examples was measured as follows. Approximately 2 μL of ion-exchanged water was dropped onto the surface of each horizontally placed sample, and the sample was tilted to 100° at a rate of 5° / s using a fully automatic contact angle meter to measure the angle at which the water began to slide (sliding angle). The sliding angle (°) for each sample is shown in Table 1. Note that for samples where water did not fall even when tilted to 100°, the sliding angle is recorded as 100°. The relationship between the obtained sliding angle and surface free energy is shown in Figure 4.

[0058] [Stain resistance evaluation] The antifouling properties of each sample of the Examples and Comparative Examples were evaluated in terms of mud adhesion and mud washability.

[0059] <Mud adhesion evaluation> A mud adhesion test was conducted on each sample of the examples and comparative examples in accordance with the test method specified in ISO24650 "Efficiency evaluation of cleaning systems." Figure 3(a) shows the spraying process of the mud adhesion test. Figure 3(b) shows the drying process of the mud adhesion test. Figure 3(c) shows the tilting process of the mud adhesion test.

[0060] First, test suspensions were prepared by dispersing eight types of test powder 1 (Kanto loam) specified in JIS Z 8901:2006 "Test powders and test particles" in water.

[0061] As shown in Figure 3(a), the resulting suspension (muddy water) was sprayed onto the surface of a vertically placed sample 30 using a gravity-feed spray gun 40 (W-77-1G, manufactured by Anest Iwata Corporation, nozzle diameter 1.5 mm) (spraying step). In the spraying step, the spray gun 40 was placed 50 cm away from the surface of sample 30, and the suspension was sprayed at a spray pressure of 3 ± 0.25 bar while moving at an average speed of 0.3 m / s.

[0062] As shown in FIG. 3(b), the sample 30 onto which the suspension was sprayed was dried by placing it on a hot plate 50 at 80° C. for 10 minutes (this completes the drying step). Next, as shown in FIG. 3(c), the sample 30 placed in a horizontal position was gradually tilted to remove the mud not adhering to the surface (this is the tilting step).

[0063] After performing the series of steps shown in Figures 3(a) to 3(c) once or multiple times (up to 10 times), the optical transmittance (transmittance) of each sample was measured at 905 nm in the wavelength range of 281.1 to 1110.1 nm using a spectrophotometer (MCPD5000, manufactured by Otsuka Electronics Co., Ltd.). The mud adhesion of each sample was evaluated based on the obtained transmittance. The evaluation criteria are as follows: It was confirmed that the transmittance of each sample was 90% or higher before the mud adhesion test.

[0064] "1": After repeating the mud adhesion test 10 times, the transmittance was 90% or more. The mud fell off and almost no mud adhered, indicating very high antifouling properties. "2": Transmittance after one mud adhesion test is 80% or more but less than 90%. This indicates that mud is difficult to adhere and that the surface has high anti-fouling properties.

[0065] "3": Transmittance after one mud adhesion test is 50% or more but less than 80%. Some mud is adhered, indicating that the antifouling property is at the lower limit. "4": The transmittance after one mud adhesion test was less than 50%, indicating high mud adhesion and poor antifouling properties.

[0066] <Mud cleaning performance evaluation> The cleaning test was conducted in accordance with the test method specified in ISO 24650 "Efficiency evaluation of cleaning systems." In the cleaning test, the cleaning process was carried out as follows for each sample after the mud adhesion test shown in Figures 3(a) to 3(c).

[0067] As shown in Figure 3(d), a spray bottle 60 was placed approximately 30 cm away from the surface of the vertically placed sample 30, and water was sprayed onto the surface of the sample 30 20 times (a total of 10 mL). After spraying, the transmittance of each sample was measured using the same method as used to evaluate the mud adhesion. Based on the obtained transmittance, the mud cleanability of each sample was evaluated. The evaluation criteria were as follows:

[0068] "A": Transmittance is 90% or more before and after the cleaning process. This indicates that the stain resistance is so high that cleaning is not necessary. "B": The transmittance increases after the cleaning process and is 80% or more. This indicates that the antifouling properties are so high that adhering mud can be removed by cleaning.

[0069] "C": Transmittance after the cleaning process is less than 80%, indicating poor mud cleanability and poor antifouling properties. The results of the mud adhesion evaluation and cleaning evaluation for each sample are shown in Table 1.

[0070] [Table 1]

[0071] [result] As shown in Table 1, it was confirmed that the smaller the surface free energy of the coating layer, the larger the contact angle with water, i.e., the more water-repellent the coating layer becomes, and the larger the surface free energy, the smaller the contact angle with water, i.e., the more water-repellent the coating layer becomes.

[0072] As shown in Table 1, the surface free energy is 20 mJ / m 2 More than 45mJ / m 2 In the following Examples 1, 2, 3 and 4, the mud adhesion evaluation was "1" to "3", and the mud cleanability evaluation was "A" or "B".

[0073] On the other hand, the surface free energy is 20 mJ / m 2 In Comparative Examples 1 and 2, which have smaller surface free energy, the mud adhesion rating was "3" and the mud cleanability rating was "C." This is because the surface free energy of the coating layer was 20 mJ / m 2 If the thickness is smaller than 100 μm, the water repellency of the coating layer becomes too high, and once mud adheres to the coating layer, it becomes difficult to remove the mud when washing with water.

[0074] From these results, even if the surface free energy of the coating layer is reduced and water repellency is increased, the surface free energy is 20 mJ / m 2 It was confirmed that if the temperature is set to the above value, it is possible to prevent mud from becoming difficult to remove when washing with water.

[0075] As shown in Table 1, the surface free energy is 45 mJ / m 2 In Comparative Example 3, which had a surface free energy of 45 mJ / m, the mud adhesion rating was "3," and in Comparative Example 4, which had a surface free energy of 45 mJ / m, the mud adhesion rating was "4." In both Comparative Examples 3 and 4, the mud cleanability rating was "C." This is because the surface free energy of the coating layer was 45 mJ / m. 2 It is thought that when the value is set to be larger than , a lot of mud adheres to the coating layer and most of the water that adheres to the coating layer during cleaning becomes difficult to drop off, so that a lot of mud and water from cleaning remain attached to the coating layer and become difficult to drop off.

[0076] From this result, even if the surface free energy of the coating layer is increased and the water repellency is reduced, the surface free energy of the coating layer is 45 mJ / m 2 It has been confirmed that if the temperature is set to the following values, adhesion of muddy water to the coating layer is suppressed and water is more likely to fall off together with the mud during cleaning.

[0077] From the above results, the surface free energy of the coating layer was set to 20 mJ / m 2 More than 45mJ / m 2 It was confirmed that setting the range within the following ranges can suppress adhesion of mud to the surface of the coating layer.

[0078] As shown in Table 1 and Figure 4, the surface free energy is 20 mJ / m 2 More than 45mJ / m 2 It was confirmed that there is a correlation between the sliding angle and the antifouling property within this range. Specifically, Examples 1 and 2, in which the sliding angle was 30° or less, were evaluated as having higher mud adhesion than Examples 3 and 4, in which the sliding angle was greater than 30°.

[0079] This indicates that the surface free energy is 20 mJ / m 2 More than 45mJ / m 2 It was confirmed that if the sliding angle is 30° or less, the antifouling properties can be improved. Moreover, Example 1, in which the sliding angle was 15° or less, received higher evaluations for both mud adhesion and mud cleanability than Examples 2 to 4, in which the sliding angle was greater than 15°.

[0080] This indicates that the surface free energy is 20 mJ / m 2 More than 45mJ / m 2 It was confirmed that if the sliding angle is 15° or less, the antifouling properties are further improved. In addition, Comparative Example 1, which had a sliding angle of 15° or less like Example 1, received significantly lower ratings than Example 1 in both the mud adhesion evaluation and the mud cleanability evaluation. This is thought to be partly due to the fact that mud had gotten in and remained between the convex parts of the uneven structure formed on the surface of the coating layer.

[0081] Furthermore, Comparative Example 2, which has a larger sliding angle than Example 2 and a smaller sliding angle than Examples 3 and 4, received a lower mud cleanability evaluation than Examples 3 and 4. This is thought to be partly due to the large bond energy between the silicon dioxide contained in the mud and the fluorine contained in the coating layer of Comparative Example 2, which makes it easier for mud to remain attached to the surface of the coating layer. [Explanation of symbols]

[0082] 10. Automobiles 10a...Front 11...Headlamp 12...Bumper cover 13...Upper cover part 14...Lower cover 15...Front grille 16...Lower grill 17...Lower garnish 20...Base material 20a…Surface 21...Coating layer 21a…Surface 30...Sample 40...Spray gun 50...Hot plate 60...Spray bottle

Claims

1. a base material formed from a resin material; a coating layer formed on the surface of the substrate, The surface free energy of the coating layer is 20 mJ / m ２ 45mJ / m or more ２ Below is the Exterior parts for vehicles.

2. The water sliding angle on the surface of the coating layer is 30° or less. The vehicle exterior part according to claim 1 .

3. the sliding angle on the surface of the coating layer is 15° or less; The vehicle exterior part according to claim 2 .

4. The vehicle exterior accessory is a lower garnish attached to the front of the vehicle. The vehicle exterior part according to any one of claims 1 to 3.

Images