Superhydrophobic, Anti-fouling and dirt-resistant colorful product for automotive exterior trims

Abstract

A superhydrophobic, anti-fouling and dirt-resistant colorful product for automotive exterior trims, relating to the technical field of automotive exterior trims. The superhydrophobic, anti-fouling and dirt-resistant colorful product for automotive exterior trims comprises a substrate (1) and a coating; the coating covers the surface of the substrate (1) and comprises a metal layer (2) and a nano coating (3); the metal layer (2) is located between the surface of the substrate (1) and the nano coating (3); when the metal layer (2) and the nano coating (3) are connected, the nano coating (3) permeates into the metal layer (2); and the contact angle of the colorful product is greater than or equal to 90°. The manufactured superhydrophobic, anti-fouling and dirt-resistant colorful product for automotive exterior trims can keep hydrophobic and anti-fingerprint properties in outdoor environments for a long time, keeps self-cleaning properties, and is easy to maintain.

Description

A super-hydrophobic, anti-fouling and dirt-resistant colorful product for automotive exterior parts Technical Field

[0001] The invention belongs to the technical field of automobile exterior decoration parts, and relates to a super-hydrophobic, anti-fouling and dirt-resistant colorful product for automobile exterior decoration parts. Background Art

[0002] With the development of intelligent vehicles, people are no longer satisfied with mere practicality; aesthetics are also becoming a necessity. Personalized body color is becoming a trend, and personalized color matching can further enhance the driver's driving experience and comfort, creating a harmonious unity with the vehicle. Therefore, most mid- to high-end vehicles require exterior trim to match the body color, and automakers are increasingly demanding this consistency.

[0003] Automotive exterior trims such as bumpers, door handles, tailgates, windows, and other decorative strips are located on the outside of the car and are often exposed to the outdoor environment. They are easily affected by rain, sewage, dust, bird droppings, fingerprints, foreign objects, and other external problems. Stained automotive exterior trims will affect the user experience. Therefore, it is necessary to propose an automotive exterior trim that is easy to maintain and can maintain a certain degree of cleanliness. Technical issues

[0004] The purpose of the present invention is to address the above-mentioned problems existing in the prior art and propose a super-hydrophobic, anti-fouling and dirt-resistant colorful product for automotive exterior parts coated with a metal compound color layer and a nano-coating. While achieving a colorful appearance, it has good hydrophobicity, fingerprint resistance, anti-fouling and dirt-resistant properties, and has good scratch resistance, high adhesion and other properties. Technical Solutions

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A super-hydrophobic, anti-fouling and stain-resistant colorful product for automobile exterior parts, comprising a substrate and a coating; at least one surface of the substrate is covered with the coating, and the coating comprises a metal layer and a nano-coating;

[0007] The metal layer is located between the surface of the substrate and the nanocoating layer;

[0008] When the metal layer and the nano coating are in contact, the nano coating penetrates into the metal layer;

[0009] The water drop angle of the multicolored product is ≥90°.

[0010] Preferably, the water drop angle of the multicolored product is ≥115°.

[0011] Preferably, the substrate includes one or more of stainless steel, aluminum alloy, plastic, and steel.

[0012] Preferably, the thickness of the metal layer is 1-999 nm, and the thickness of the nano coating is 1-999 nm.

[0013] Preferably, the thickness of the metal layer is 1-800 nm, and the thickness of the nanocoating is 1-500 nm.

[0014] More preferably, the thickness of the metal layer is 10-500 nm, and the thickness of the nanocoating is 10-100 nm.

[0015] More preferably, the thickness of the metal layer is 40-90 nm; the thickness of the nanocoating is 10-100 nm, specifically 10 nm, 20 nm, 25 nm, 30 nm, 35 nm, 40 nm, 45 nm, 50 nm, 60 nm, 70 nm, 75 nm, 80 nm, 90 nm, or 100 nm.

[0016] In the present invention, the metal layer needs to have a certain thickness to ensure the penetration depth of the nano coating and further ensure the adhesion between the coatings.

[0017] Preferably, the metal layer is a one-layer or multi-layer structure.

[0018] Preferably, the nano coating contains silicon and fluorine elements.

[0019] Further preferably, during the heating and drying process, the silanol groups generated by the nano-liquid combine with the activated hydroxyl groups in the metal layer through hydrogen bonding; simultaneously, condensation reaction occurs between adjacent silanol groups to form a stable Si-O-Si chemical bond.

[0020] Further preferably, the fluorine element in the nanocoating is derived from a fluorine source, including one or more of hydrofluoroether, perfluorohexyl methyl ether, perfluorobutyl methyl ether, perfluorobutyl ethyl ether, perfluoropolyether, perfluoropolyether-modified silane compound, fluorosilicone-modified acrylic resin and derivatives thereof;

[0021] The silicon element is derived from a silicon source, including one or more of a silane coupling agent, a siloxane compound, a silicone polymer, a polysiloxane resin, an organic silicone resin, vinyltrimethoxysilane, tetraethoxysilane, a silicon-modified acrylate, a silicon-modified epoxy resin, a fluorosilicone-modified acrylic resin, a silicon-modified phenolic resin, a silicon-modified polyurethane, and a modified silica sol.

[0022] Preferably, the nano coating is prepared by covering the surface of the metal layer with a low surface energy high molecular polymer nano liquid and then drying it.

[0023] More preferably, the raw materials of the low surface energy high molecular polymer nanofluid include: 0.1-10% fluorine source, 0.01-2% silicon source, 0-5% additive, and 90-99.5% solvent.

[0024] More preferably, the solvent comprises one or more of toluene, ethanol, tetrahydrofuran, ethyl acetate, acetone, methanol, perfluoro(2-butyltetrahydrofuran), 2,2,3,3,4,4,5-heptafluorotetrahydro-5-(nonafluorobutyl)furan, 2-nonafluorobutyltetrahydrofuran, heptylfluorotetrahydro-2-(nonafluorobutyl)furan, trifluoroethanol, nonafluorobutyl methyl ether, and nonafluorobutyl ethyl ether;

[0025] The auxiliary agent includes one or more of an antioxidant, an ultraviolet absorber, a defoaming agent, a wetting agent, a lubricant, and fumed silica.

[0026] Preferably, the metal layer is prepared by physical vapor deposition (PVD) and / or chemical vapor deposition (CVD) of the metal and / or metal compound;

[0027] Specifically, it includes one or more of magnetron sputtering coating, ion plating, vacuum evaporation, plasma chemical vapor deposition, laser induced chemical vapor deposition, and low-pressure chemical vapor deposition.

[0028] More preferably, the vacuum degree of the PVD magnetron sputtering is 1×10 -2 ~8×10 -5 Pa, temperature 100~1000 degrees, power 1~30KW, gas flow rate 10~2000sccm; the gas is one or more of argon, nitrogen, oxygen, and acetylene.

[0029] Preferably, the depth of penetration of the nano coating into the metal layer is 0-90% of the thickness of the metal layer.

[0030] Preferably, the substrate surface is pre-treated before the metal layer is covered;

[0031] The pre-treatment includes one or more of cleaning, polishing, wire drawing, sand blasting, etching, etching, degreasing and activation.

[0032] More preferably, the activation comprises one or more of plasma treatment and ion bombardment;

[0033] The plasma treatment is carried out in air, and the plasma power is 400~2000w;

[0034] The ion bombardment is carried out in a vacuum environment with a vacuum degree of 1×10 -2 ~8×10 -5 Pa, gas flow rate is 100~1000sccm.

[0035] Preferably, the metal layer is pretreated before being covered with the nano-coating;

[0036] The pretreatment includes one or more of cleaning, drying, dust removal, and activation.

[0037] More preferably, the cleaning includes one or more of acid cleaning, alkali cleaning, clean water cleaning, and pure water cleaning.

[0038] More preferably, the activation comprises one or more of plasma treatment and ion bombardment;

[0039] The plasma treatment is carried out in air with a plasma power of 400-2000w;

[0040] The ion bombardment is carried out in a vacuum environment with a vacuum degree of 1×10 -2 ~8×10 -5 Pa, gas flow rate is 100~1000sccm.

[0041] Preferably, the initial water drop angle of the super-hydrophobic, anti-fouling and dirt-resistant colorful product for automobile exterior parts is ≥115°;

[0042] With cotton cloth load 1N / cm 2 After 5000 cycles of friction, the water drop angle performance can still reach more than 90%;

[0043] Preferably, the surface of the super-hydrophobic, anti-fouling and dirt-resistant colorful product for automobile exterior trim is free of defects such as particle spots, orange peel, and fantasy colors.

[0044] A method for preparing a super-hydrophobic, anti-fouling and dirt-resistant colorful product for automobile exterior parts, the preparation method comprising:

[0045] (1) Pre-treat the substrate;

[0046] (2) Covering at least one surface of the substrate in (1) with a metal layer, followed by cleaning and drying;

[0047] (3) Pre-treating the metal layer on the surface of the substrate in (2), then covering it with nano-coating liquid, baking it to dry, and cooling it down.

[0048] Preferably, the pre-treatment in (1) includes one or more of cleaning, polishing, wire drawing, sandblasting, etching, etching, degreasing, and activation.

[0049] More preferably, the activation comprises one or more of plasma treatment and ion bombardment;

[0050] The plasma treatment is carried out in air, and the plasma power is 400-2000W;

[0051] The ion bombardment is carried out in a vacuum environment with a vacuum degree of 1×10-2 ~8×10 -5 Pa, gas flow rate is 100~1000sccm.

[0052] Preferably, the plating processing speed of the metal layer in (2) is 0.1~100m / min.

[0053] Preferably, the pretreatment in (3) includes one or more of cleaning, drying, dust removal, and activation.

[0054] More preferably, the activation comprises one or more of plasma treatment and ion bombardment;

[0055] The plasma treatment is carried out in air, and the plasma power is 400-2000W;

[0056] The ion bombardment is carried out in a vacuum environment with a vacuum degree of 1×10 -2 ~8×10 -5 Pa, gas flow rate is 100~1000sccm.

[0057] More preferably, the cleaning includes one or more of acid cleaning, alkali cleaning, clean water cleaning, and pure water cleaning.

[0058] Preferably, the method of covering the surface of the metal layer with the nano-coating liquid in (3) includes one or more of spraying, roller coating, flow coating, and smearing.

[0059] More preferably, the atomizing air pressure during the spraying process is 0.1-10 Pa, the spraying distance is 1-100 cm, the liquid flow rate is 20-160 g / min, and the spraying speed is 0.1-30 m / min.

[0060] At a certain spraying speed, if the liquid flow rate is too small or too large, it will affect the thickness, flatness and coating performance of the coating; similarly, at a certain liquid flow rate, the spraying speed will also affect the coating performance.

[0061] More preferably, the liquid flow rate of the curtain coating is 50-30 g / min; and the moving speed of the roller coating is 5-30 m / min.

[0062] Preferably, the baking and drying temperature in (3) is 150-250° C., and the drying time is 10-50 min.

[0063] Insufficient baking temperature or time will cause incomplete condensation reaction of the surface film structure, resulting in degraded test performance, rapid decline in surface hydrophobicity, and rapid decrease in water drop angle after wear resistance test; excessively high temperature will cause carbonization and failure of nanomaterials.

[0064] Preferably, the cooling in (3) is accelerated cooling, including one or more of air cooling and water cooling.

[0065] A super-hydrophobic, anti-fouling and stain-resistant colorful product for automobile exterior parts is used in the field of automobile parts. The super-hydrophobic, anti-fouling and stain-resistant colorful product for automobile exterior parts can be applied to decorative strips such as automobile bumpers, tailgates, door handles, and windows;

[0066] The super-hydrophobic, anti-fouling and dirt-resistant colorful product for automobile exterior parts can also be used in automobile parts through insert injection molding. Beneficial effects

[0067] Compared with the prior art, the present invention has the following beneficial effects:

[0068] 1. The super-hydrophobic, anti-fouling and stain-resistant multi-colored product for automotive exterior parts of the present invention is a substrate having a coating on its surface, wherein the coating comprises a metal layer and a nano-coating; when the metal layer and the nano-coating are in contact, the nano-coating penetrates into the metal layer, giving the coating high adhesion performance;

[0069] 2. The surface of the super-hydrophobic, anti-fouling and stain-resistant multi-colored product for automotive exterior parts of the present invention has a coating, which includes a metal layer and a nano-coating. The metal layer is located between the substrate surface and the nano-coating. The multi-colored metal layer can adapt to the needs of different car body colors, and the nano-coating makes the metal layer less likely to change color.

[0070] 3. The nano-coating on the surface of the super-hydrophobic, anti-fouling and dirt-resistant multi-colored product for automotive exterior parts of the present invention has excellent hydrophobic properties, with an initial water drop angle of ≥115°; after friction tests and other tests, the water drop angle performance can still be maintained at more than 90%;

[0071] 4. The super-hydrophobic, anti-fouling and dirt-resistant colorful products for automobile exterior parts produced by the present invention have no surface defects such as particle spots, orange peel, and fantasy colors;

[0072] 5. The super-hydrophobic, anti-fouling and dirt-resistant colorful products for automobile exterior parts prepared by the present invention can maintain hydrophobic and anti-fingerprint properties for a long time in outdoor environments, remain self-cleaning and easy to care for. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] FIG1 is a schematic cross-sectional view of a super-hydrophobic, anti-fouling and dirt-resistant multi-colored product for automotive exterior parts in Example 1 of the present invention;

[0074] FIG2 is an electron microscope image of a super-hydrophobic, anti-fouling and dirt-resistant multi-colored product for automobile exterior parts in Example 1 of the present invention;

[0075] FIG3 is a diagram showing the hydrophobic effects of the super-hydrophobic, anti-fouling and dirt-resistant colorful products for automobile exterior parts in Example 1 and Comparative Example 2 of the present invention.

[0076] In the figure: 1. Substrate, 2. Metal layer, 3. Nanocoating. Modes for Carrying Out the Invention

[0077] The following are specific embodiments of the present invention, which further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0078] Unless otherwise specified, the materials used in the present invention are conventional commercial products, and the methods used are conventional technical means.

[0079] The water drop angle test in the present invention includes:

[0080] Initial water drop angle test: LSA100 water drop angle tester;

[0081] Friction test: with cotton cloth load 1N / cm 2 The friction was carried out and the water drop angle was tested after 5000 cycles. Example 1

[0082] The super-hydrophobic, anti-fouling and anti-fouling colorful product for automotive exterior parts in this embodiment has a three-layer structure, including a stainless steel substrate, a metal layer, and a nano-coating; the thickness of the metal layer is 160nm, and the thickness of the nano-coating is 80nm;

[0083] The preparation method of a super-hydrophobic, anti-fouling and dirt-resistant colorful product for automobile exterior parts comprises:

[0084] (1) Pre-treat the surface of the substrate by sandblasting, mirror polishing, etc. to achieve the required surface brightness; then degrease and clean to ensure that the surface is free of grease, dirt, and water stains;

[0085] Then plasma treatment is carried out. The plasma treatment is carried out in air with a power of 900W.

[0086] (2) PVD magnetron sputtering is performed on the surface of the substrate after surface activation treatment, and the substrate is introduced into the coating furnace chamber with a vacuum degree of 4×10 -3 pa, argon flow rate of 700 sccm, nitrogen flow rate of 100 sccm, temperature of 300 °C, power of 12 kW;

[0087] (3) After taking out the substrate coated with the metal layer in (2), washing it with clean water, drying it, removing dust, and performing plasma treatment on the surface of the metal layer; the plasma treatment is performed in air with a plasma power of 850W;

[0088] Then, a nano coating liquid is coated on the surface of the metal layer; the raw materials of the nano coating liquid include 2% perfluoropolyether, 95% 2,2,3,3,4,4,5-heptafluorotetrahydro-5-(nonafluorobutyl)furan, 0.2% siloxane coupling agent, 0.005% fumed silica, and the balance is antioxidant;

[0089] The stainless steel coated with the nano-coating liquid is placed in an oven at a baking temperature of 220°C for 15 minutes; it is then air-cooled until the temperature of the stainless steel product is below 50°C.

[0090] FIG1 is a schematic cross-sectional view of a super-hydrophobic, anti-fouling and dirt-resistant multi-colored product for automotive exterior parts in this embodiment;

[0091] FIG2 is an electron microscope image of the PVD layer of the super-hydrophobic, anti-fouling and dirt-resistant multi-colored product for automobile exterior parts of this embodiment;

[0092] Figure 3 is a diagram showing the hydrophobic performance of the super-hydrophobic, anti-fouling and dirt-resistant colorful product for automotive exterior parts in this embodiment. It can be seen from Figure 3 that the surface of the product in this embodiment has good hydrophobicity, and the initial water drop angle can reach 117°; the water drop angle is 114° after 5000 wear tests; and only part of the ink remains after writing with an oil pen, which can be easily erased; dirty water can also be easily erased without leaving any traces; no traces can be observed with the naked eye after touching it with a finger.

[0093] After the test, the coating adhesion test of the multi-colored product of this embodiment was grade 1 (ISO 2409), and the surface appearance was visually free of discoloration and damage. Example 2

[0094] The super-hydrophobic, anti-fouling and anti-fouling colorful product for automotive exterior parts in this embodiment has a three-layer structure, including a stainless steel substrate, a metal layer, and a nano-coating; the thickness of the metal layer is 80nm, and the thickness of the nano-coating is 60nm;

[0095] The preparation method of a super-hydrophobic, anti-fouling and dirt-resistant colorful product for automobile exterior parts comprises:

[0096] (1) Pre-treat the surface of the substrate by using mirror polishing or other methods to achieve the required surface brightness; then degrease and clean it to ensure that the surface is free of grease, dirt, and water stains;

[0097] Then, ion bombardment treatment was performed in a vacuum with a vacuum degree of 5×10 -3 , introduce argon gas with a gas flow rate of 400 sccm and a time of 70 s;

[0098] (2) PVD magnetron sputtering is performed on the surface after surface activation treatment, and the substrate is introduced into the coating furnace chamber with a vacuum degree of 6×10 -3pa, argon flow rate of 200 sccm, nitrogen flow rate of 200 sccm, temperature of 230 °C, power of 15 KW;

[0099] (3) After taking out the substrate coated with the metal layer in (2), pickling and washing with clean water, drying and dust removal are performed, and the surface of the metal layer is subjected to plasma treatment; the plasma treatment is performed in air with a plasma power of 700W;

[0100] Then, a nano coating liquid is sprayed on the surface of the metal layer, wherein the raw materials of the nano coating liquid include 7% perfluoropolyether, 91% perfluoro(2-butyltetrahydrofuran), 1% polysiloxane resin, and the balance is antioxidant;

[0101] The spraying process parameters are: atomizing pressure of 3 Pa, spraying distance of 20 cm, liquid flow rate of 80 g / min, and spraying speed of 2 m / min;

[0102] The stainless steel sprayed with the nano-coating liquid is placed in an oven at a baking temperature of 180°C for 15 minutes; then water-cooled until the temperature of the stainless steel product is below 50°C.

[0103] The performance test of the super-hydrophobic, anti-fouling and dirt-resistant colorful product for automobile exterior parts prepared in this embodiment was carried out. The initial water drop angle was 116°, and the water drop angle dropped to 110° after 5000 wear tests. Example 3

[0104] The super-hydrophobic, anti-fouling and anti-fouling colorful product for automotive exterior parts in this embodiment has a three-layer structure, including a stainless steel substrate, a metal layer, and a nano-coating; the thickness of the metal layer is 60nm, and the thickness of the nano-coating is 90nm;

[0105] The preparation method of a super-hydrophobic, anti-fouling and dirt-resistant colorful product for automobile exterior parts comprises:

[0106] (1) Pre-treat the substrate surface by sandblasting or mirror polishing to achieve the required surface brightness. Then perform degreasing and cleaning to ensure that the surface is free of grease, dirt, and water stains; then perform ion bombardment treatment, which is carried out in a vacuum with a vacuum degree of 5×10 -3 , introduce argon gas with a gas flow rate of 400 sccm and a time of 60 s;

[0107] (2) PVD magnetron sputtering is performed on the surface after surface activation treatment, and the substrate is introduced into the coating furnace chamber with a vacuum degree of 3×10 -3 Pa, argon flow rate of 300 sccm, nitrogen flow rate of 50 sccm, temperature of 400 °C, power of 19 kW;

[0108] (3) After taking out the substrate coated with the metal layer in (2), washing it with alkali and water, drying it, removing dust, and performing plasma treatment on the surface of the metal layer; the plasma treatment is performed in air with a plasma power of 700W;

[0109] Then, a nano coating liquid is coated on the surface of the metal layer, wherein the raw materials of the nano coating liquid include 5% perfluoropolyether, 0.01% silicone resin, and the balance is 2-nonafluorobutyltetrahydrofuran;

[0110] The stainless steel coated with the nano-coating liquid is placed in an oven at a baking temperature of 240°C for 15 minutes; then water-cooled until the temperature of the stainless steel product is below 50°C.

[0111] The performance test of the super-hydrophobic, anti-fouling and dirt-resistant colorful product for automobile exterior parts prepared in this embodiment was carried out. The initial water drop angle was 117°, and the water drop angle dropped to 109° after 5000 wear tests. Example 4

[0112] Compared with Example 1, the difference is that the baking drying time of the nano coating in step (3) is 23 minutes; the initial water drop angle is 115°, and the water drop angle decreases to 108° after 5000 wear tests. Example 5

[0113] Compared with Example 1, the difference is that the baking drying time of the nano coating in step (3) is 10 minutes; the initial water drop angle is 114°, and the water drop angle decreases to 106° after 5000 wear tests. Example 6

[0114] Compared with Example 1, the difference is that the baking drying time of the nano coating in step (3) is 40 minutes; the initial water drop angle is 114°, and the water drop angle decreases to 104° after 5000 wear tests. Example 7

[0115] The super-hydrophobic, anti-fouling and anti-fouling colorful product for automotive exterior parts in this embodiment has a three-layer structure, including a stainless steel substrate, a metal layer, and a nano-coating; the thickness of the metal layer is 900nm, and the thickness of the nano-coating is 800nm;

[0116] The preparation method of a super-hydrophobic, anti-fouling and dirt-resistant colorful product for automobile exterior parts comprises:

[0117] (1) Pre-treat the surface of the substrate by sandblasting, mirror polishing, etc. to achieve the required surface brightness; then degrease and clean to ensure that the surface is free of grease, dirt, and water stains;

[0118] Then plasma treatment is carried out. The plasma treatment is carried out in air with a power of 900W.

[0119] (2) PVD magnetron sputtering is performed on the surface of the substrate after surface activation treatment, and the substrate is introduced into the coating furnace chamber with a vacuum degree of 4×10 -3 pa, argon flow rate of 700 sccm, nitrogen flow rate of 100 sccm, temperature of 300 °C, power of 12 kW;

[0120] (3) After taking out the substrate coated with the metal layer in (2), washing it with clean water, drying it, removing dust, and performing plasma treatment on the surface of the metal layer; the plasma treatment is performed in air with a plasma power of 850W;

[0121] Then, a nano coating liquid is coated on the surface of the metal layer; the raw materials of the nano coating liquid include 2% perfluoropolyether, 95% 2,2,3,3,4,4,5-heptafluorotetrahydro-5-(nonafluorobutyl)furan, 0.2% siloxane coupling agent, 0.005% fumed silica, and the balance is antioxidant;

[0122] The stainless steel coated with the nano-coating liquid is placed in an oven at a baking temperature of 220°C for 25 minutes; it is then air-cooled until the temperature of the stainless steel product is below 50°C.

[0123] The performance test of the super-hydrophobic, anti-fouling and dirt-resistant colorful product for automobile exterior parts prepared in this embodiment was carried out. The initial water drop angle was 115°, and the water drop angle dropped to 104° after 5000 wear tests. Comparative Example 1

[0124] Compared with Example 1, the difference is that the surface of the metal layer has no coating.

[0125] The multi-colored product for automobile exterior trim prepared in this comparative example has an initial water drop angle of 81°. Comparative Example 2

[0126] Compared with Example 1, the difference is that a transparent protective layer (acrylic resin) with a thickness of 15 μm is sprayed on the surface of the metal layer.

[0127] The multi-colored product for automobile exterior trim prepared in this comparative example has an initial water drop angle of 84°. Comparative Example 3

[0128] Compared with Example 1, the difference is that the raw materials of the nano coating liquid include 6% perfluoropolyether and the balance is 2,2,3,3,4,4,5-heptafluorotetrahydro-5-(nonafluorobutyl)furan.

[0129] The performance test of the super-hydrophobic, anti-fouling and dirt-resistant colorful product for automobile exterior parts prepared in this embodiment was carried out. The initial water drop angle was 113°, and the water drop angle dropped to 81° after 5000 wear tests. Comparative Example 4

[0130] Compared with Example 1, the difference is that the baking drying temperature of the nano coating in step (3) is 130°C; the initial water drop angle is 115°, and the water drop angle drops to 93° after 3000 wear tests. Comparative Example 5

[0131] Compared with Example 1, the difference is that the baking drying time of the nano coating in step (3) is 100°C; the initial water drop angle is 114°, and the water drop angle drops to 87° after 2000 wear tests. Comparative Example 6

[0132] Compared with Example 1, the difference is that the baking drying temperature of the nano coating in step (3) is 350°C; the initial water drop angle is 107°, and the water drop angle drops to 79° after 2000 wear tests. Comparative Example 7

[0133] Compared with Example 2, the difference is that the liquid flow rate during the spraying process is 10 g / min.

[0134] The super-hydrophobic, anti-fouling and dirt-resistant colorful product for automobile exterior parts prepared in this embodiment has an initial water drop angle of 90°. Comparative Example 8

[0135] Compared with Example 2, the difference is that the liquid flow rate during the spraying process is 180 g / min.

[0136] The super-hydrophobic, anti-fouling and dirt-resistant colorful product for automobile exterior parts prepared in this embodiment has an initial water drop angle of 113°, and a white mist appears on the coating surface.

[0137] In summary, the surface nanocoating of the super-hydrophobic, anti-fouling and dirt-resistant colorful product for automobile exterior parts of the present invention forms a network structure with the metal surface through chemical reaction, so that the coating has high adhesion performance; and the nanocoating has excellent hydrophobic performance, the initial water drop angle is ≥90°, and can even be ≥115°; after the friction test, the water drop angle performance can still be maintained at more than 90%; the super-hydrophobic, anti-fouling and dirt-resistant colorful product for automobile exterior parts can maintain hydrophobic and anti-fingerprint properties for a long time in outdoor environment, keep self-cleaning and easy to care for.

[0138] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. A super-hydrophobic, anti-fouling and dirt-resistant multi-colored product for automobile exterior parts, characterized in that: The super-hydrophobic, anti-fouling and dirt-resistant colorful product for automobile exterior parts comprises a substrate and a coating; At least one surface of the substrate is covered with a coating, and the coating includes a metal layer and a nano coating; The metal layer is located between the surface of the substrate and the nano coating; When the metal layer and the nano coating are in contact, the nano coating penetrates into the metal layer; The water drop angle of the multi-colored product is ≥90°.

2. The super-hydrophobic, anti-fouling and dirt-resistant multi-colored product for automobile exterior parts according to claim 1, characterized in that: The water drop angle of the multi-colored product is ≥115°.

3. The super-hydrophobic, anti-fouling and dirt-resistant multi-colored product for automobile exterior parts according to claim 1, characterized in that: The thickness of the metal layer is 1-999 nm, and the thickness of the nano coating is 1-999 nm.

4. The super-hydrophobic, anti-fouling and dirt-resistant multi-colored product for automobile exterior parts according to claim 1, characterized in that: The thickness of the metal layer is 1-800 nm, and the thickness of the nano coating is 1-500 nm.

5. The super-hydrophobic, anti-fouling and dirt-resistant multi-colored product for automobile exterior parts according to claim 1, characterized in that: The nano coating contains silicon and fluorine elements.

6. The super-hydrophobic, anti-fouling and dirt-resistant multi-colored product for automobile exterior parts according to claim 1, characterized in that: The nano coating is prepared by covering the surface of the metal layer with a low surface energy high molecular polymer nano liquid and then drying it; During the heating and drying process, the silanol groups generated by the nanoliquid combine with the activated hydroxyl groups in the metal layer through hydrogen bonding; at the same time, condensation reaction occurs between adjacent silanol groups in the nanoliquid to form a stable Si-O-Si chemical bond.

7. The super-hydrophobic, anti-fouling and dirt-resistant multi-colored product for automobile exterior parts according to claim 6, characterized in that: The raw materials of the low surface energy high molecular polymer nanofluid include: 0.1-10% fluorine source, 0.01-2% silicon source, 0-5% auxiliary agent, and 90-99.5% solvent.

8. The super-hydrophobic, anti-fouling and dirt-resistant multi-colored product for automobile exterior parts according to claim 7, characterized in that: The fluorine source includes one or more of hydrofluoroether, perfluorohexyl methyl ether, perfluorobutyl methyl ether, perfluorobutyl ethyl ether, perfluoropolyether, perfluoropolyether modified silane compound, fluorine-silicon modified acrylic resin and derivatives thereof; The silicon source includes one or more of silane coupling agent, siloxane compound, siloxane polymer, polysiloxane resin, silicone resin, vinyl trimethoxysilane, tetraethoxysilane, silicon-modified acrylate, silicon-modified epoxy resin, fluorosilicone-modified acrylic resin, silicon-modified phenolic resin, silicon-modified polyurethane, and modified silica sol; The solvent includes one or more of toluene, ethanol, tetrahydrofuran, ethyl acetate, acetone, methanol, perfluoro(2-butyltetrahydrofuran), 2,2,3,3,4,4,5-heptafluorotetrahydro-5-(nonafluorobutyl)furan, 2-nonafluorobutyltetrahydrofuran, heptylfluorotetrahydro-2-(nonafluorobutyl)furan, trifluoroethanol, nonafluorobutyl methyl ether, and nonafluorobutyl ethyl ether; The auxiliary agent includes one or more of an antioxidant, an ultraviolet absorber, a defoamer, a wetting agent, a lubricant, and fumed silica.

9. The super-hydrophobic, anti-fouling and dirt-resistant multi-colored product for automobile exterior parts according to claim 1, characterized in that: The substrate includes one or more of stainless steel, aluminum alloy, plastic, and steel.

10. A method for preparing a super-hydrophobic, anti-fouling and dirt-resistant colorful product for automobile exterior parts as claimed in claim 1, characterized in that: The preparation method comprises: (1) Pre-treat the substrate; (2) Covering the surface of the substrate in (1) with a metal layer, followed by cleaning and drying; (3) Pre-treating the metal layer on the surface of the substrate, then covering it with the nano-coating liquid, baking it to dry it, and cooling it down.

11. The method for preparing the super-hydrophobic, anti-fouling and dirt-resistant colorful product for automobile exterior parts according to claim 10, characterized in that: The pre-treatment in (1) includes one or more of cleaning, polishing, wire drawing, sandblasting, etching, etching, degreasing, and activation; The activation comprises one or more of plasma treatment and ion bombardment; The pretreatment in (3) includes one or more of cleaning, drying, dust removal, and activation; The activation includes one or more of plasma treatment and ion bombardment.

12. The method for preparing the super-hydrophobic, anti-fouling and dirt-resistant colorful product for automobile exterior parts according to claim 10, characterized in that: The method of covering the surface of the metal layer with the nano coating liquid in (3) includes one or more of spraying, roller coating, flow coating and smearing.

13. The method for preparing the super-hydrophobic, anti-fouling and dirt-resistant colorful product for automobile exterior parts according to claim 12, characterized in that: The spraying process has an atomizing pressure of 0.1-10 Pa, a spraying distance of 1-100 cm, a liquid flow rate of 20-160 g / min, and a spraying speed of 0.1-30 m / min; The liquid flow rate of the curtain coating is 50-30 g / min; the moving speed of the roller coating is 5-30 m / min.

14. The method for preparing the super-hydrophobic, anti-fouling and dirt-resistant colorful product for automobile exterior parts according to claim 10, characterized in that: The baking and drying temperature in (3) is 150-250° C. and the time is 10-50 min.

15. Application of the super-hydrophobic, anti-fouling and dirt-resistant colorful product for automobile exterior parts according to claim 1 in the field of automobile parts.

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