Coating material, profile and method for repairing thereof

Abstract

The application provides a coating material, a profile and a repairing method thereof. The coating material is used for adhering a profile body and an ink layer, and comprises an acrylic resin, an epoxy resin and an active additive. The coating material has viscosity and is used for adhering the profile body and the ink layer, and has high reliability.

Description

Technical Field

[0001] This invention relates to the field of metal processing, and more particularly to a coating material for profiles, profiles, and a repair method thereof. Background Technology

[0002] Profiles refer to solid straight bars of metal that have been plastically shaped and have a specific cross-sectional shape and size. Profiles come in a wide variety of specifications and have a broad range of applications, playing a very important role in rolling production.

[0003] Taking aluminum alloy profiles as an example, such as Al6061, Al6063, or Al6013, these profiles are lightweight and have a strong metallic feel. They also possess unique advantages in formability, surface treatment, and anodizing. Therefore, aluminum alloy profiles are commonly used to manufacture the display bezels of TVs, all-in-one commercial displays, and smart educational devices. As the display bezel for TVs or all-in-one commercial displays, these bezels are relatively large. Currently, there are two processing routes in the industry. One is the traditional route: first, the aluminum alloy profile is processed into a three- or four-sided frame structure, such as a "door-shaped" frame, through bending and welding. Then, the surface of the three- or four-sided frame structure is treated with mechanical surface treatments such as sandblasting or wire drawing, and finally, anodizing is performed. This traditional route suffers from very low efficiency in mechanical surface treatment and anodizing due to the limitations of large-size structures. Another novel process involves first subjecting long aluminum alloy profiles to mechanical surface treatments (such as wire drawing and sandblasting) and pre-anodizing. Finally, bending and welding are performed to create a "gate-shaped" three- or four-sided frame structure. This new process advances the anodizing process before bending, freeing the anodizing equipment from the limitations of the frame structure dimensions. Long aluminum alloy profiles can be stacked and placed into the anodizing tank, resulting in a 3- to 4-fold increase in production capacity and a significant reduction in overall costs.

[0004] While the aforementioned new process route increases production capacity and reduces costs, a key appearance issue remains unresolved. The aluminum alloy profile is first oxidized and then bent. However, during the bending process, a certain proportion of the bending area, such as the radius (R-angle), will have damaged areas, i.e., areas requiring repair. This results in appearance problems such as exposed white material or exposed metal substrate at the bending point. Furthermore, moisture, oxygen, or corrosive gases in the air can easily penetrate the interior of the aluminum alloy profile through the damaged areas at the bending point, compromising the profile's corrosion resistance.

[0005] In related technologies, ink layers are formed directly on the damaged areas of the profile. However, since the damaged areas of aluminum profiles easily absorb moisture and pollutants from the air, it is not conducive to the adhesion of ink to the surface of the aluminum profile, resulting in the risk of ink layer peeling off and reduced safety and reliability. Summary of the Invention

[0006] This application provides a coating material, a profile, and a repair method thereof. The coating material is adhesive and is used to adhere to the profile body and the ink layer, thus exhibiting high reliability.

[0007] This application provides a coating material for adhering to a profile body and an ink layer. The coating material includes acrylic resin, epoxy resin, and active additives.

[0008] In some embodiments, the coating material further includes an organic solvent used to dissolve the acrylic resin, the epoxy resin, and the active additives.

[0009] In some embodiments, the organic solvent includes xylene.

[0010] In some embodiments, the organic solvent further includes isopropanol, cyclohexane, and ethyl acetate; the components of the organic solvent, by mass percentage, include: isopropanol: 25%–50%; xylene: 15%–35%; cyclohexane: 5%–15%; and ethyl acetate: 1%–10%.

[0011] In some embodiments, the coating material comprises, by weight percentage: the organic solvent: 91%–97.9%; the acrylic resin: 1%–7%; the epoxy resin: 0.8%–1%; and the active additives: 0.3%–1%.

[0012] In some embodiments, the active agent is a silane coupling agent.

[0013] This application embodiment also provides a profile, including:

[0014] A profile body, wherein the profile body has an area to be repaired;

[0015] A base coating layer is disposed on the area to be repaired, and the base coating layer is formed of the aforementioned coating material;

[0016] An ink layer is disposed on the side of the base coating away from the profile body to cover the area to be repaired;

[0017] The base coating layer is used to adhere the profile body and the ink layer.

[0018] In some embodiments, the ink layer is made of polyurethane acrylate resin and an active diluent.

[0019] In some embodiments, the reactive diluent is a monofunctional acrylate or a polyfunctional acrylate.

[0020] In some embodiments, the thickness of the base coating is 0.5 to 5 μm.

[0021] In some embodiments, the thickness of the ink layer is 5 to 20 μm.

[0022] This application also provides a method for repairing profiles, including:

[0023] Provide a profile body;

[0024] Identify the area of ​​the profile body to be repaired;

[0025] The aforementioned coating material is applied to the area to be repaired on the profile body to form a base coating.

[0026] An ink layer is applied to the base coating to cover the area to be repaired;

[0027] The base coating layer is used to adhere the profile body and the ink layer.

[0028] In some embodiments, the step of applying the coating material to the profile body to form a base coating includes:

[0029] A coating material is applied to the area to be repaired, the coating material further comprising an organic solvent;

[0030] The coating material is dried to allow the organic solvent to evaporate, thereby forming the base coat on the area to be repaired.

[0031] In some embodiments, forming an ink layer on the base coating includes:

[0032] A photocurable ink mixture is applied to the base coating, the photocurable ink mixture comprising a polyurethane acrylate resin prepolymer, a reactive diluent, and a photoinitiator;

[0033] The photocurable ink mixture is exposed to light to cure it and form an ink layer.

[0034] In some embodiments, the composition of the photocurable ink mixture is, by mass percentage: 40%–50% of the polyurethane acrylate resin prepolymer; 10%–20% of the reactive diluent; and 5%–15% of the photoinitiator.

[0035] In some embodiments, the process of forming an ink layer on the base coating includes:

[0036] The thermosetting ink mixture is applied to the base coating;

[0037] The thermosetting ink mixture is heated to cure it and form an ink layer.

[0038] In some embodiments, after identifying the area of ​​the profile to be repaired, the area to be repaired is further cleaned using ethanol or isopropanol.

[0039] The coating material, profile, and repair method provided in this application embodiment are used to adhere to both the profile body and the ink layer. The coating material includes acrylic resin, epoxy resin, and reactive additives. This coating material can adhere to both the profile body and the ink layer to repair the profile body and improve its corrosion resistance. The coating material connects to both the profile body and the ink layer, increasing the adhesion of the ink layer to the profile body and thus enhancing reliability. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram illustrating the formation process of the profile body in the related technology provided in the embodiments of this application.

[0042] Figure 2 This is a schematic diagram of the structure of the profile body and the ink layer provided in the embodiments of this application.

[0043] Figure 3 This is a schematic diagram of the profile provided in an embodiment of this application.

[0044] Figure 4 This is a schematic diagram illustrating the repair process of the profile body provided in the embodiments of this application.

[0045] Figure 5 This is a schematic diagram of the first process of a method for repairing profiles provided in an embodiment of this application.

[0046] Figure 6 A first process flow diagram is provided for the formation of the ink layer in the embodiments of this application.

[0047] Figure 7 A second process flow diagram is provided for the formation of the ink layer in the embodiments of this application.

[0048] Figure 8 This is a schematic diagram of a second process for a method of repairing profiles provided in an embodiment of this application. Detailed Implementation

[0049] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0050] Bending refers to the process by which a metal sheet undergoes elastic deformation under the pressure of the upper or lower die of a bending machine, followed by plastic deformation. In the initial stage of plastic bending, the sheet is freely bent. As the upper or lower die applies pressure to the sheet, the sheet gradually comes into close contact with the inner surface of the lower die groove. At the same time, the radius of curvature and the bending lever arm gradually decrease. Pressure continues to be applied until the stroke ends, making full contact between the upper and lower dies and the sheet at three points. This completes the bending process, which is commonly known as folding.

[0051] Please see Figure 1 , Figure 1 This is a schematic diagram illustrating the formation process of the profile body in the related technology provided in the embodiments of this application.

[0052] Taking the aluminum alloy profile body 10 as an example, such as Al6061, Al6063, or Al6013, the aluminum alloy profile body 10 is lightweight and has a strong metallic feel, especially with unique advantages in formability, mechanical surface treatment, and anodizing. Therefore, the display bezels of products such as TVs, commercial display all-in-one machines, and smart education machines are often made of aluminum alloy profile body 10. As the display bezel of TVs or commercial display all-in-one machines, the size of this display bezel is relatively large. Currently, there are two processing routes in the industry. One is the traditional process route: first, the aluminum alloy profile body 10 is processed into a three- or four-sided frame structure, such as a "door-shaped" structure, through bending, welding, etc., then the appearance surface of the three- or four-sided frame structure is mechanically surface treated such as sandblasting or wire drawing, and finally anodizing is performed. Due to the large size structure limitations, the efficiency of mechanical surface treatment and anodizing is very low in this traditional process route. The other is a new process route, such as... Figure 1(1) First, the long aluminum alloy profile body 10 is mechanically surface treated (wire drawing, sandblasting, etc.), and then pre-folded lines are formed on the profile body 10; (2) Then the profile body 10 is anodized and colored with ink; (3) Finally, bending, welding and other forming processes are carried out to obtain a "door-shaped" three- or four-sided frame structure. It can be seen that, since the anodizing process of the aluminum alloy profile body 10 is brought forward to before the bending process, the oxidation equipment is no longer limited by the frame structure size. The long aluminum alloy profile body 10 can be put into the oxidation tank in a stacked manner, and the production capacity is increased by 3 to 4 times, and the overall cost is also greatly reduced.

[0053] Although the aforementioned new process route increases production capacity and reduces costs, a key appearance issue remains unresolved. The aluminum alloy profile body 10 is first oxidized and then bent into shape. However, during the bending process of the aluminum alloy profile body 10, if... Figure 1 (3) There will be a certain proportion of damaged areas at the bend 11, such as the R-angle, which is the area to be repaired, resulting in appearance problems such as the white and colorless surface or exposed metal substrate at the bend 11; and because water vapor, oxygen or corrosive gases in the air can easily invade the interior of the profile body 10 from the damaged area of ​​the bend 11, the corrosion resistance of the profile body 10 cannot be guaranteed.

[0054] In the technical solutions of related technologies, when the finished product of the aluminum alloy profile body 10 is designed to be silver-white, since aluminum is also silver-white, even if the bend 11 of the aluminum alloy profile body 10 is damaged, it is not visually noticeable and has little impact on the appearance. However, in related technologies, the appearance color of the aluminum alloy profile body 10 can only be silver. If the appearance color is dark, the color contrast is more obvious because the damaged area exposes the white without color or the metal base material, resulting in appearance problems.

[0055] In other related technologies, aluminum alloy profiles are repaired using processes such as deplating, polishing, and re-oxidation. This related technology is time-consuming, labor-intensive, and costly.

[0056] This application provides a coating material, a profile, and a repair method thereof. The coating material is adhesive and is used to adhere to the profile body and the ink layer, exhibiting high reliability. The following detailed description is provided in conjunction with the accompanying drawings.

[0057] Please see Figure 2 , Figure 2 This is a schematic diagram of the structure of the profile body and the ink layer provided in the embodiments of this application.

[0058] This application provides a coating material for adhering a profile body 10 and an ink layer 40. The coating material includes acrylic resin, epoxy resin, and active additives.

[0059] The acrylic and epoxy resins possess film-forming properties, enabling the formation of a uniform and dense film layer on the surface of the profile body 10, such as the area to be repaired. Active additives enhance the film-forming properties and adhesion of the acrylic and epoxy resins. These active additives can be amphoteric surfactants, cationic surfactants, and nonionic surfactants, such as metal oxides, hydroxides, basic carbonates, fatty acids, amines, polyols, and amino alcohols. The active additive can be a single chemical substance or several chemical substances, such as sodium hydroxide, or a mixture of sodium hydroxide and sodium carbonate.

[0060] The active additive can be a silane coupling agent. This silane coupling agent has both inorganic and organic groups. The inorganic groups of the silane coupling agent bind to the filler surface, while the organic groups entangle with or react with the polymer resin. Therefore, this active additive can improve the adhesion of the primer coating 30 to the profile body 10.

[0061] The coating material provided in this embodiment is used to adhere to the profile body 10 and the ink layer 40. The coating material includes acrylic resin, epoxy resin, and reactive additives. This coating material can adhere to both the profile body 10 and the ink layer 40 to repair the profile body 10 and improve its corrosion resistance. The coating material connects to both the profile body 10 and the ink layer 40, improving the adhesion of the ink layer 40 to the profile body 10 and increasing reliability.

[0062] In some embodiments, the coating material further includes an organic solvent used to dissolve the acrylic resin, epoxy resin, and active additives.

[0063] The organic solvent must be volatile, free-flowing, dispersible, and soluble. This organic solvent is used to dissolve acrylic resins and epoxy resins. The organic solvent can be a low-to-medium boiling point solvent, for example, with a boiling point of 140°C or less. The organic solvent can be one or more of isopropanol, xylene, cyclohexane, and ethyl acetate. Specifically, isopropanol has a boiling point of 82.5°C, xylene has a boiling point of 137°C to 140°C, cyclohexane has a boiling point of 80.7°C, and ethyl acetate has a boiling point of 76.5°C to 77.5°C.

[0064] For example, the organic solvent is xylene. Xylene has strong solubility for acrylic resins and epoxy resins, which can prevent the coating material from precipitating and improve the flowability of the coating material on the profile body 10. The organic solvent can be a mixture of isopropanol, xylene, cyclohexane, and ethyl acetate. Isopropanol, cyclohexane, and ethyl acetate, due to their low boiling points, low viscosity, and fast evaporation rates, play an auxiliary role in diluting and dispersing the material and in rapidly drying the coating film.

[0065] If the organic solvent contains only one type of chemical, it has fewer functionalities but lower cost. When the organic solvent contains multiple chemical substances, its functions become more diverse. It is understandable that when the organic solvent includes isopropanol, xylene, cyclohexane, and ethyl acetate, it exhibits higher volatility, higher fluidity, higher dispersibility, and better solubility for acrylic resins, epoxy resins, and reactive additives.

[0066] Furthermore, cyclohexane, isopropanol, and ethyl acetate are used as diluents to improve the dispersibility of acrylic resin, epoxy resin, and reactive additives. Additionally, the low viscosity and high volatility of cyclohexane, isopropanol, and ethyl acetate enhance the surface drying speed of the coating material after application to the profile body 10. Xylene has a relatively high boiling point and strong resin-dissolving ability, preventing precipitation when acrylic resin, epoxy resin, and reactive additives are dissolved in organic solvents. Furthermore, isopropanol, xylene, cyclohexane, and ethyl acetate, as solvents, enhance the leveling properties of the coating material after application to the profile body 10, resulting in superior film-forming properties.

[0067] In some cases, the organic solvent composition, by mass percentage, includes: isopropanol: 25%–50%; xylene: 15%–35%; cyclohexane: 5%–15%; ethyl acetate: 1%–10%. It is understood that using this proportion of components in the organic solvent provides high volatility, high fluidity, high dispersibility, and strong solubility for acrylic and epoxy resins, while also enabling the cleaning of the surface of the profile body 10.

[0068] In some embodiments, the coating material comprises, by mass percentage: organic solvent: 91%–97.9%; acrylic resin: 1%–7%; epoxy resin: 0.8%–1%; and active additives: 0.3%–1%. Coating materials using the above proportions exhibit not only good ductility but also good adhesion.

[0069] Please continue reading. Figure 2 as well as Figure 3 , Figure 3This is a schematic diagram of the structure of a profile provided in an embodiment of this application. This application also provides a profile 1, which includes a profile body 10, a base coating layer 30, and an ink layer 40. The profile body 10 has a repairable area 20. The base coating layer 30 is disposed on the repairable area 20 and is formed of the coating material described in the above embodiments. The ink layer 40 is disposed on the side of the base coating layer 30 away from the profile body 10 to cover the repairable area 20. The base coating layer 30 is used to adhere the profile body 10 and the ink layer 40.

[0070] The profile body 10 can be made of aluminum alloy, other metals, or their alloys. Taking aluminum alloy as an example, the profile body 10 can be an aluminum alloy extruded profile body 10. The aluminum alloy extruded profile body 10 is formed by using an aluminum alloy ingot to extrude an aluminum alloy extruded profile body 10 with a middle frame cross-sectional shape through an extrusion press and an extrusion die, and then cutting the aluminum alloy extruded profile body 10. Subsequently, the aluminum alloy extruded profile body 10 can be subjected to wire drawing or sandblasting treatment to form a wire drawing or sandblasting effect on the surface of the aluminum alloy extruded profile body 10.

[0071] Subsequently, a dense and porous anodized film can be formed on the surface of the aluminum alloy extruded profile body 10 through chemical oxidation or anodizing. The aluminum alloy extruded profile body 10 can be bent, welded, and other forming processes to obtain a "gate-shaped" display frame.

[0072] Please continue reading. Figure 1 as well as Figure 4 , Figure 4 This is a schematic diagram illustrating the repair process of the profile body provided in this application embodiment. After the aluminum alloy extruded profile body 10 is bent, a rounded corner appearance surface is formed at the bent portion. The rounded corner appearance surface refers to the portion of the rounded corners of the two bends 11 of the "door-shaped" frame that is observable during use. The area to be repaired 20 can be located at the bend 11 of the profile body 10, that is, at the rounded corner of the profile body 10.

[0073] The surface of the profile body 10 may have cracks or damage to the anodic oxide film, exposing the alloy beneath it; this surface is the repair area 20. By identifying the repair area 20 of the profile body 10, the profile body 10 can be repaired.

[0074] During the repair process of the repaired area 20 of the profile body 10, a primer coating 30 is applied to the repaired area 20. The primer coating 30 completely covers the repaired area 20. The thickness of the primer coating 30 is uniform, approximately 0.5 to 5 μm. The primer coating 30 can be a transparent liquid. When the primer coating 30 is a transparent liquid, it can not only completely cover the repaired area 20, but also extend beyond the edge of the repaired area 20, for example, extending 0.5 mm to 1.5 mm beyond the repaired edge, to completely cover the repaired area 20. Because the primer coating 30 is a transparent liquid, extending beyond the edge of the repaired area 20 also ensures the integrity of the appearance of the profile body 10.

[0075] An ink layer 40 is formed on the base coating 30 to cover the area 20 to be repaired. It is understood that the color of the ink layer 40 can be the same as the color of the outer surface of the profile body 10, so that the repair of the area 20 does not reveal cracks or damage to the oxide film of the profile body 10. Furthermore, because the cracks or damage on the oxide film of the profile body 10 are covered by the ink layer 40, external moisture, oxygen, and corrosive gases are less likely to enter the interior of the profile body 10 from the cracks or damage, thus improving the corrosion resistance of the profile body 10.

[0076] Therefore, the ink layer 40 can cover and repair the repaired area 20 of the profile body 10 to repair the repaired area 20 of the profile body 10; the base layer 30 grips the profile body 10 on the one hand and the ink layer 40 on the other hand, improving the adhesion of the ink layer 40 on the profile body 10, making the ink layer 40 less likely to fall off the profile body 10, thereby increasing reliability.

[0077] The ink layer 40 is made of polyurethane acrylate resin and a reactive diluent. The reactive diluent is a monofunctional or polyfunctional acrylate; the reactive diluent may be one or more of the following: isobornyl methacrylate, isooctyl methacrylate, dodecyl methacrylate, isodecanyl methacrylate, caprolactone methacrylate, hydroxyethyl methacrylate, C16-C18 methacrylate, stearic acid methacrylate, 2-ethylhexyl methacrylate, hexanediol diacrylate, polyethylene glycol diacrylate, tripropylene glycol diacrylate, propoxylated trimethylolpropane triacrylate, or propoxylated pentaerythritol tetraacrylate.

[0078] The thickness of the base coating 30 is between 0.5 μm and 5 μm. For example, the thickness of the base coating 30 is 3 μm. When the thickness of the base coating 30 is as described above, the base coating 30 can enhance the reliability of adhesion to the profile body 10 and the ink layer 40, without the base coating 30 being too thick, so as to form obvious protrusions on the profile body 10 and affect the appearance.

[0079] The ink layer 40 has a thickness of 5 to 20 μm. For example, the ink layer 40 has a thickness of 15 μm. When the thickness of the ink layer 40 is as described above, it can cover the uneven color caused by cracks or damage on the oxide film of the profile body 10, and also prevent the ink layer 40 from forming obvious protrusions on the profile body 10, which would affect the appearance.

[0080] Please continue reading. Figure 3 as well as Figure 5 , Figure 5 This application provides a schematic diagram of the first process for a method of repairing profiles.

[0081] This application also provides a method for repairing a profile 1. The method includes the following steps: S1, providing a profile body 10; S2, identifying the area 20 to be repaired on the profile body 10; S3, applying the coating material described in the above embodiment to the area 20 to be repaired to form a base coating 30; S4, applying an ink layer 40 to the base coating 30 to cover the area 20 to be repaired. The base coating 30 is capable of adhering to both the profile body 10 and the ink layer 40.

[0082] In some embodiments, the material of the base coating 30 includes acrylic resin, epoxy resin, and active additives.

[0083] The step of applying a coating material to the area to be repaired 20 to form a base coat 30 includes applying a coating material to the area to be repaired 20 to form a base coat 30. The coating material includes acrylic resin, epoxy resin, and reactive additives.

[0084] The acrylic and epoxy resins possess film-forming properties, forming a uniform and dense film layer in the area to be repaired 20. The active additives enhance the film-forming properties and adhesion of the acrylic and epoxy resins. These active additives can be amphoteric surfactants, cationic surfactants, and nonionic surfactants, such as metal oxides, hydroxides, basic carbonates, fatty acids, amines, polyols, and amino alcohols. The active additive can be a single chemical substance or several chemical substances, such as sodium hydroxide, or a mixture of sodium hydroxide and sodium carbonate.

[0085] The active additive can be a silane coupling agent. This silane coupling agent has both inorganic and organic groups. The inorganic groups of the silane coupling agent bind to the filler surface, while the organic groups entangle with or react with the polymer resin. Therefore, this active additive can improve the adhesion of the primer coating 30 to the profile.

[0086] The repair method of the profile 1 involves applying a coating material to the area 20 to be repaired to form a base coating 30. The coating material also includes an organic solvent. The coating material is then dried to allow the organic solvent to evaporate, thereby forming a base coating 30 on the area 20 to be repaired.

[0087] The coating material comprises, by mass percentage: organic solvent: 91%–97.9%; acrylic resin: 1%–7%; epoxy resin: 0.8%–1%; and active additives: 0.3%–1%.

[0088] The coating material can be applied to the area 20 to be repaired by using tools such as a flat-tipped primer brush or a roller to evenly apply the coating material to the area 20 to be repaired.

[0089] The organic solvent must be volatile, free-flowing, dispersible, and soluble. This organic solvent is used to dissolve acrylic resins and epoxy resins. The organic solvent can be a low-to-medium boiling point solvent, for example, with a boiling point of 140°C or less. The organic solvent can be one or more of isopropanol, xylene, cyclohexane, and ethyl acetate. Specifically, isopropanol has a boiling point of 82.5°C, xylene has a boiling point of 137°C to 140°C, cyclohexane has a boiling point of 80.7°C, and ethyl acetate has a boiling point of 76.5°C to 77.5°C.

[0090] For example, the organic solvent is xylene. Xylene has strong solubility for acrylic resins and epoxy resins, which can prevent the coating material from precipitating and improve the flowability of the coating material on the profile body 10. The organic solvent can be a mixture of isopropanol, xylene, cyclohexane, and ethyl acetate. Isopropanol, cyclohexane, and ethyl acetate, due to their low boiling points, low viscosity, and fast evaporation rates, play an auxiliary role in diluting and dispersing the material and accelerating the drying of the coating film.

[0091] If an organic solvent contains only one type of chemical, its functionality is limited. When an organic solvent contains multiple chemical substances, its functionality becomes more diverse. It is understandable that when an organic solvent includes isopropanol, xylene, cyclohexane, and ethyl acetate, it exhibits higher volatility, higher fluidity, higher dispersibility, and better solubility for acrylic resins, epoxy resins, and reactive additives.

[0092] Furthermore, cyclohexane, isopropanol, and ethyl acetate are used as diluents to improve the dispersibility of acrylic resin, epoxy resin, and reactive additives. Additionally, the low viscosity and high volatility of cyclohexane, isopropanol, and ethyl acetate enhance the surface drying speed of the coating material after application to the profile body 10. Xylene has a relatively high boiling point and strong resin-dissolving ability, preventing precipitation when acrylic resin, epoxy resin, and reactive additives are dissolved in organic solvents. Furthermore, isopropanol, xylene, cyclohexane, and ethyl acetate, as solvents, enhance the leveling properties of the coating material after application to the profile body 10, resulting in superior film-forming properties.

[0093] In this process, the organic solvent in the coating material is dried to evaporate, thereby forming a base coating 30 on the area to be repaired 20. For example, after the coating material is evenly applied to the area to be repaired 20, the surface of the base coating is dried with hot air at a drying temperature of 50°C to 80°C for 3 to 5 minutes to ensure that the surface is fully dried and forms a uniform film, thus forming the base coating 30. Alternatively, after the coating material is evenly applied to the area to be repaired 20, the solvent in the coating material evaporates at room temperature to form the base coating 30.

[0094] In some cases, the organic solvent comprises, by mass percentage: isopropanol: 25%–50%; xylene: 15%–35%; cyclohexane: 5%–15%; ethyl acetate: 1%–10%. It is understood that using this proportion of components in the organic solvent results in high volatility, high fluidity, high dispersibility, and strong solubility for acrylic and epoxy resins, while also enabling the cleaning of the area 20 to be repaired.

[0095] In some embodiments, the thickness of the base coating 30 is 0.5 to 5 μm. For example, the thickness of the base coating 30 is 3 μm. When the thickness of the base coating 30 is the above value, the base coating 30 can enhance the reliability of adhesion to the profile body 10 and the ink layer 40, without the base coating 30 being too thick, so that the base coating 30 forms obvious protrusions on the profile body 10, affecting the appearance.

[0096] In related technologies, after the profile body 10, which has undergone anodizing, is baked at high temperature for a long time, the anodized film on its surface is prone to cracking. Simultaneously, under high-temperature conditions, the profile body 10, acting as the anode, is also prone to discoloration or fading. Here, "high temperature" refers to a temperature greater than or equal to 120°C, and "long time" refers to a baking time greater than or equal to 20 minutes. To avoid these issues, this application embodiment can select a low-temperature curable ink, including photocurable inks or low-temperature baking inks. Both photocurable and low-temperature baking inks can be metallic inks. The applicable baking temperature for low-temperature baking inks is less than or equal to 100°C.

[0097] In some embodiments, please refer to Figure 6 , Figure 6 This application provides a first process flow diagram of the ink layer formation process. The ink layer 40 formation process includes: S200, printing a photocurable ink mixture; S300, photocuring. In the step of setting the ink layer 40 on the base coating 30, the repair method of the profile 1 includes: setting the photocurable ink mixture on the base coating 30, the photocurable ink mixture including a polyurethane acrylate resin prepolymer, an active diluent, and a photoinitiator; irradiating the photocurable ink mixture to cure it, thereby forming the ink layer 40. Under the action of light, the polyurethane acrylate resin prepolymer undergoes a polymerization reaction to form the ink layer 40 on the base coating 30. It is understood that the photocurable ink mixture is a photocurable ink mixture. The light irradiation can be ultraviolet (UV) light.

[0098] The reactive diluent is a monofunctional or polyfunctional acrylate; the reactive diluent may be one or more of the following: isobornyl methacrylate, isooctyl methacrylate, dodecyl methacrylate, isodecanyl methacrylate, caprolactone methacrylate, hydroxyethyl methacrylate, C16-C18 methacrylate, stearic acid methacrylate, 2-ethylhexyl methacrylate, hexanediol diacrylate, polyethylene glycol diacrylate, tripropylene glycol diacrylate, propoxylated trimethylolpropane triacrylate, or propoxylated pentaerythritol tetraacrylate.

[0099] The method for applying the UV-curable ink mixture to the base coating 30 can be by using screen printing or pad printing equipment to uniformly print the UV-curable ink mixture onto the surface of the base coating 30 of the area to be repaired 20. The mesh count of the screen printing equipment can be 300 to 350 mesh. The printing area of ​​the UV-curable ink mixture can be equal to or slightly larger than the area of ​​the area 20 to be repaired on the base coating 30. The thickness of the UV-curable ink mixture on the base coating 30 can be 10 μm to 20 μm.

[0100] After the UV-curable ink mixture is applied to the base coating 30, it can be left to stand at room temperature for 5 to 8 minutes before entering the curing process to form the ink layer 40. This means that the UV-curable ink mixture is left to stand at room temperature for 5 to 8 minutes to allow it to fully level and stably settle on the base coating 30.

[0101] The composition of the photocurable ink mixture, by mass percentage, is: 40%–50% polyurethane acrylate resin prepolymer; 10%–20% reactive diluent; and 5%–15% photoinitiator. The photoinitiator can be one or more ketones, such as benzophenone, p-phenylbenzophenone, haloacetophenone, hydroxycyclohexylphenyl ketone, etc.; or it can be one or more benzoin and its ethers, such as benzoin methyl ether, benzoin ethyl ether, benzoin butyl ether, α-methyl benzoin, α-phenyl benzoin, etc.

[0102] Among them, polyurethane-modified acrylate resin is a prepolymer that polymerizes after light irradiation to form polyurethane acrylate resin. It is a crucial component determining the performance of ink layer 40, belonging to its basic components and serving as the main film-forming substance. It plays a vital role in the curing process of the coating material and the properties of the cured ink film. The reactive diluent can reduce the viscosity of the prepolymer and, under the influence of light irradiation and the initiator, can itself polymerize, becoming part of ink layer 40. The photoinitiator can absorb ultraviolet light within a certain wavelength range, generating free radicals through decomposition reactions or through photoexcitation-induced secondary reactions. The free radicals generated during UV irradiation can initiate the polymerization reaction of the polyurethane acrylate resin prepolymer and the reactive diluent.

[0103] After the UV-curing ink mixture is applied to the base coating 30, it can be left to stand for 5 to 8 minutes to allow the ink mixture to fully level. Then, the ink mixture is UV-cured using a light-emitting diode (LED) lamp. The UV curing process parameters can be: light energy of 12,000 to 15,000 mJ (millijoules), power of 1.2 to 1.5 kW (kilowatts), UV curing wavelength of 365 nm (nanometers) or 395 nm, and illumination time of 5 to 20 seconds (seconds).

[0104] The light-cured ink mixture also includes one or more of the following: talc, pigment, coupling agent, defoamer, and leveling agent.

[0105] Talc powder serves as a filler, enhancing the strength of the ink layer 40. Pigments can be formulated to match the color of the profile body 10, achieving a color consistency with its outer surface. Coupling agents undergo a self-crosslinking reaction with the prepolymer, providing adhesion and density to the ink layer 40. Defoamers rapidly defoam during the mixing of the UV-cured ink mixture. Leveling agents ensure rapid leveling of the printed UV-cured ink mixture.

[0106] For example, when a UV-cured ink mixture includes talc, pigment, coupling agent, defoamer, and leveling agent, the composition of the UV-cured ink mixture, by mass percentage, is: talc: 5%–15%; pigment: 5%–15%; coupling agent: 1%–3%; defoamer: 0.5%–1%; leveling agent: 0.2%–1%. It is understandable that using this proportion of components in the UV-cured ink mixture can achieve high strength, suitable color concentration, high adhesion and density, and ease of processing.

[0107] The coupling agent can be one or more of the following: silane coupling agents containing vinyl and methacrylamide groups, silane coupling agents containing epoxy groups, and silane coupling agents containing amino groups. The defoamer can be a mixture of defoaming polymers and polysiloxanes. The leveling agent can be one or more of the following: polyether-modified polydimethylsiloxane, polyacrylate compounds, ink surfactants, and oil-based leveling agents.

[0108] In some embodiments, please refer to Figure 7 , Figure 7 A second process flow diagram is provided for the formation of the ink layer in this application embodiment. The formation process of the ink layer 40 includes: S400, printing a thermosetting ink mixture; S500, baking and curing. When the conditions for heat baking and curing are available, a low-temperature baking type ink can be applied to the base coating layer 30 and then cured to form the ink layer 40.

[0109] The step of setting the ink layer 40 on the base coating 30 involves the following steps in the repair method of the profile 1: setting a thermosetting ink mixture on the base coating 30; heating the thermosetting ink mixture to cure it and form the ink layer 40. The thermosetting ink mixture is a low-temperature baking type ink.

[0110] In the embodiments of this application, the thermosetting ink mixture is made by thoroughly mixing 100 parts of SS-H501Y ink, 5 parts of a special curing agent, and 5 to 15 parts of a diluent.

[0111] After the thermosetting ink mixture is applied to the base coat 30, it can be left to stand for 5 to 8 minutes to allow the thermosetting ink mixture to fully level. Then, the thermosetting ink mixture is baked and cured through a drying tunnel or baking oven at a temperature of 80°C to 100°C for 15 to 20 minutes to complete the curing.

[0112] Therefore, during the curing process of the thermosetting ink mixture, the baking temperature is less than 100°C and the baking time is less than 20 minutes. This can prevent the anodized film on the surface of the profile body 10 from cracking, discoloration, or fading.

[0113] In some embodiments, the thickness of the ink layer 40 is 5 to 20 μm. For example, the thickness of the ink layer 40 is 15 μm. When the thickness of the ink layer 40 is the above value, it can cover the white color caused by cracks or damage on the oxide film of the profile body 10, and also prevent the ink layer 40 from forming obvious protrusions on the profile body 10, affecting the appearance.

[0114] In some embodiments, after identifying the repairable area 20 at the bend 11 of the profile body 10, the repair method of the profile 1 includes cleaning the repairable area 20 with ethanol or isopropanol to facilitate the subsequent application of the primer coating 30 onto the repairable area 20. The ethanol used has a mass percentage of 75%.

[0115] Optionally, for cracks or exposed bottom areas of the oxide film at the outer R-corner of the frame bend, wipe the area to be repaired 20 with a solvent such as 75% alcohol or isopropanol, and let it dry for 15 to 30 seconds to allow the alcohol or isopropanol to evaporate before proceeding to the next step.

[0116] In some scenarios, please refer to Figure 8 , Figure 8 This is a schematic diagram of a second process for a method of repairing profiles provided in an embodiment of this application.

[0117] Taking the aluminum alloy profile body 10 as an example, the specific steps to form a finished product, such as a "door-shaped" frame, are as follows: S101, aluminum extrusion; S102, mechanical surface treatment (wire drawing or sandblasting); S103, anodizing of the profile body 10; S104, punching; S105, bending; S106, welding; S107, surface cleaning; S108, surface primer coating process; S109, printing process (screen printing or pad printing); S110, curing process (low-temperature baking curing or light curing); S111, finished product. The above steps are explained below.

[0118] Aluminum extrusion: An aluminum alloy ingot is extruded through an extruder and an extrusion die to form a profile body 10 with a middle frame cross-section, such as an aluminum extruded profile body 10, and then cut according to the total length of the three sides of the middle frame.

[0119] Mechanical surface treatment: The aluminum extruded profile body 10 is subjected to wire drawing or sandblasting treatment to form a wire drawing or sandblasting effect;

[0120] Anodizing of the profile body 10: The profile body 10 is anodized to form a protective oxide film on its surface. When coloring of the profile body 10 is required, dyeing can be performed after oxidation, followed by sealing with the anodized film; when a silver-white color is required, anodized film sealing can be performed after oxidation.

[0121] Punching and bending: The profile body 10 is punched with a V-shaped notch, and then bent at 90° to form a triangular frame structure.

[0122] Welding: Welding is performed at the bending seams to fix the frame structure and enhance its stability.

[0123] Surface cleaning: For the areas 20 to be repaired, such as cracked oxide film or exposed bottom at the outer R-corner of the frame bend, wipe the areas 20 to be repaired with solvents such as 75% alcohol or isopropanol, and let them dry for 15 to 30 seconds before proceeding to the next step.

[0124] Surface Primer Coating Process: Using a flat-tipped primer pen or roller, the coating material is evenly applied to the area to be repaired 20, ensuring the primer coating 30 completely covers the area 20. The thinner the coating, the better, while maintaining uniformity; the coating thickness should be approximately 0.5 μm to 5 μm. This coating material is a transparent liquid and may include 25%–50% isopropanol, 15%–35% xylene, 5%–15% cyclohexane, 1%–10% ethyl acetate, 1%–7% acrylic resin, 0.8%–1% epoxy resin, and 0.3%–1% other active additives. After evenly applying the coating material to the area to be repaired 20, the surface is dried using a hot air gun at a drying temperature of 50°C to 80°C for 3 to 5 minutes to ensure thorough drying and uniform film formation. Isopropanol, xylene, cyclohexane, and ethyl acetate, as solvents, possess high volatility, high fluidity, high dispersibility, and the ability to clean surfaces and dissolve resin components in coating materials. Acrylic and epoxy resins have film-forming properties, forming a uniform and dense film layer on the surface, serving as the basic film-forming substances for coating materials. Active additives further enhance the film-forming properties and adhesion of acrylic and epoxy resins on the surface. The primer layer 30 primarily acts as a bridge, connecting the area to be repaired 20 on one hand and the ink layer 40 on the other.

[0125] The first printing process involves uniformly printing the UV-curable ink mixture onto the surface of the base coating 30 in the area to be repaired 20 using screen printing equipment (300-350 mesh). The printing area is equal to or slightly larger than the area of ​​the base coating 30, and the film thickness is 8μm to 15μm. After standing at room temperature for 5 to 8 minutes, the UV-curable ink mixture undergoes a curing process. This UV-curable ink mixture can be a UV-curable ink, comprising 40%-50% polyurethane-modified acrylate resin, 10%-20% polyfunctional acrylate monomers, 5%-15% hydroxycyclohexylphenyl ketone, 5%-15% talc, 5%-15% pigment, 1%-3% coupling agent, 0.5%-1% defoamer, and 0.2%-1% leveling agent. Polyurethane-modified acrylate resin is a polymeric prepolymer, a crucial component determining the performance of UV varnish coatings, a fundamental component of UV inks, and a film-forming substance. Its properties play a significant role in the curing process and the properties of the cured ink film. Multifunctional reactive acrylate monomers act as reactive diluents, reducing the viscosity of the prepolymer. Simultaneously, the monomers themselves polymerize, becoming part of the cured film. Hydroxycyclohexylphenyl ketone is a photoinitiator, initiating the polymerization reaction of the prepolymer and reactive monomers under UV light. Talc is a filler, enhancing the ink's strength. Pigments can be formulated to match the anodized color. Coupling agents undergo self-crosslinking reactions with the prepolymer, providing film adhesion and density. Defoamers rapidly defoam during ink mixing. Leveling agents help the printed ink layer level quickly.

[0126] The second printing process: After the thermosetting ink mixture is applied to the base layer 30, it can be left to stand for 5 to 8 minutes to allow the thermosetting ink mixture to fully level.

[0127] The first curing process (corresponding to the first printing process): After printing, let it stand for 5 to 8 minutes, and then the printed part is UV cured under the light of an LED UV curing machine. The curing energy is 12,000 to 15,000 millijoules, the power is 1.2 to 1.5 kW, the UV curing wavelength is 365 nm or 395 nm, and the curing time is 5 to 20 seconds.

[0128] The second curing process (corresponding to the second printing process): The thermosetting ink mixture is cured by baking in a drying tunnel or baking oven at a temperature of 80-100℃ for 15-20 minutes.

[0129] This application embodiment also provides a primer coating 30. The primer coating 30 can be applied to the repair method of the profile 1 described above. The primer coating 30 is capable of adhering to the profile body 10 and the ink layer 40. The material composition of the primer coating 30 includes acrylic resin, epoxy resin, and reactive additives.

[0130] A coating material is applied to the area 20 to be repaired to form a base coat 30. The coating material includes acrylic resin, epoxy resin, and reactive additives.

[0131] This application embodiment also provides an ink layer 40. This ink layer 40 can be applied to the repair method for the profile 1 described above. The ink layer 40 can cover the exposed white areas caused by cracks or damage to the oxide film on the profile body 10.

[0132] The acrylic and epoxy resins possess film-forming properties, forming a uniform and dense film layer in the area to be repaired 20. The active additives enhance the film-forming properties and adhesion of the acrylic and epoxy resins. These active additives can be amphoteric surfactants, cationic surfactants, and nonionic surfactants, such as metal oxides, hydroxides, basic carbonates, fatty acids, amines, polyols, and amino alcohols. The active additive can be a single chemical substance or several chemical substances, such as sodium hydroxide, or a mixture of sodium hydroxide and sodium carbonate.

[0133] The coating material also includes organic solvents. By drying the coating material, the organic solvents evaporate, forming a base coat 30 on the area 20 to be repaired.

[0134] The coating material can be applied to the area 20 to be repaired by using tools such as a flat-tipped primer brush or a roller to evenly coat the area 20. The thickness of the coating material can be from 0.5 μm to 5 μm.

[0135] The coating material comprises, by mass percentage: organic solvent: 91%–97.9%; acrylic resin: 1%–7%; epoxy resin: 0.8%–1%; and active additives: 0.3%–1%.

[0136] The organic solvent must possess volatility, fluidity, dispersibility, and solubility. This organic solvent is used to dissolve acrylic resins and epoxy resins, and its boiling point can be less than or equal to 80°C. The organic solvent can be one or more of isopropanol, xylene, cyclohexane, and ethyl acetate. If the organic solvent contains only one chemical substance, its functionality is limited. When the organic solvent contains multiple chemical substances, its functionality becomes more diverse. It is understood that when the organic solvent includes isopropanol, xylene, cyclohexane, and ethyl acetate, it exhibits higher volatility, higher fluidity, higher dispersibility, and better solubility for acrylic and epoxy resins.

[0137] In this process, the organic solvent in the coating material is dried to evaporate, thereby forming a base coating 30 on the area to be repaired 20. For example, after the coating material is evenly applied to the area to be repaired 20, the surface of the base coating is dried with hot air at a drying temperature of 50°C to 80°C for 3 to 5 minutes to ensure that the surface is fully dried and forms a uniform film, thus forming the base coating 30. Alternatively, after the coating material is evenly applied to the area to be repaired 20, the solvent in the coating material evaporates at room temperature to form the base coating 30.

[0138] The organic solvent comprises, by mass percentage: isopropanol: 25%–50%; xylene: 15%–35%; cyclohexane: 5%–15%; and ethyl acetate: 1%–10%. It is understood that using this proportion of components in the organic solvent results in high volatility, high fluidity, high dispersibility, and strong solubility for acrylic and epoxy resins.

[0139] The present application provides a method for repairing a profile 1 and a base coating 30. The method includes providing a profile body 10; identifying the area 20 to be repaired at the bend 11 of the profile body 10; applying a base coating 30 to the area 20 to be repaired; and applying an ink layer 40 to the base coating 30 to cover the area 20 to be repaired. The base coating 30 is capable of adhering to both the profile body 10 and the ink layer 40. The ink layer 40 covers and repairs the area 20 to be repaired on the profile body 10, thereby repairing the area 20 and improving the corrosion resistance of the profile body 10. The base coating 30 adheres to both the profile body 10 and the ink layer 40, increasing the adhesion of the ink layer 40 to the profile body 10 and improving reliability.

[0140] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0141] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0142] The coating materials, profiles, and repair methods provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application, and the descriptions of the embodiments above are only for the purpose of helping to understand this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A profile, characterized in that, include: The profile body has an anodized film on its surface. When the profile body is bent, the anodized film cracks, forming an area to be repaired. A base coating layer is applied to the area to be repaired. The base coating layer is formed of a coating material comprising acrylic resin, epoxy resin, and a silane coupling agent. The acrylic resin and epoxy resin form a uniform and dense film on the surface of the profile body, and the silane coupling agent enhances the adhesion of the acrylic resin and epoxy resin. The coating material also includes an organic solvent used to dissolve the acrylic resin, epoxy resin, and silane coupling agent. The composition of the coating material, by mass percentage, comprises: organic solvent: 91%~97.9%; acrylic resin: 1%~7%; epoxy resin: 0.8%~1%; silane coupling agent: 0.3%~1%. An ink layer is disposed on the side of the base coating away from the profile body to cover the area to be repaired; The base coating layer is used to adhere the profile body and the ink layer.

2. The profile according to claim 1, characterized in that, The boiling point of the organic solvent is less than or equal to 140°C.

3. The profile according to claim 2, characterized in that, The organic solvent includes xylene.

4. The profile according to claim 3, characterized in that, The organic solvent further includes isopropanol, cyclohexane, and ethyl acetate; the components of the organic solvent by mass percentage include: isopropanol: 25%~50%; xylene: 15%~35%; cyclohexane: 5%~15%; and ethyl acetate: 1%~10%.

5. The profile according to claim 1, characterized in that, The ink layer is made of polyurethane acrylate resin and reactive diluent.

6. The profile according to claim 5, characterized in that, The reactive diluent is a monofunctional acrylate or a polyfunctional acrylate.

7. The profile according to any one of claims 1 to 6, characterized in that, The thickness of the base coating is 0.5 to 5 μm.

8. The profile according to any one of claims 1 to 6, characterized in that, The thickness of the ink layer is 5 to 20 μm.

9. A method for repairing a profile as described in any one of claims 1 to 8, characterized in that, include: A profile body is provided, the surface of which has an anodized film. When the profile body is bent, the anodized film cracks, forming an area to be repaired. Identify the area of ​​the profile body to be repaired; The coating material is applied to the area to be repaired to form a base coat; An ink layer is applied to the base coating to cover the area to be repaired; The base coating layer is used to adhere the profile body and the ink layer.

10. The method for repairing profiles according to claim 9, characterized in that, The step of applying the coating material to the area to be repaired to form a base coat includes: A coating material is applied to the area to be repaired, the coating material further comprising an organic solvent having a boiling point of less than or equal to 140°C; The coating material is dried to allow the organic solvent to evaporate, thereby forming the base coat on the area to be repaired.

11. The method for repairing profiles according to claim 9, characterized in that, The process of setting an ink layer on the base coating includes: A photocurable ink mixture is applied to the base coating, the photocurable ink mixture comprising a polyurethane acrylate resin prepolymer, a reactive diluent, and a photoinitiator; The photocurable ink mixture is exposed to light to cure it and form an ink layer.

12. The method for repairing profiles according to claim 11, characterized in that, The UV-curable ink mixture is a UV-curable ink, and the components of the UV-curable ink, by mass percentage, include: 40%–50% polyurethane modified acrylate resin, 10%–20% multifunctional acrylate monomers, 5%–15% photoinitiator hydroxycyclohexylphenyl ketone, 5%–15% talc, 5%–15% pigment, 1%–3% coupling agent, 0.5%–1% defoamer, and 0.2%–1% leveling agent.

13. The method for repairing profiles according to claim 9, characterized in that, The step of setting an ink layer on the base coating includes: The thermosetting ink mixture is applied to the base coating; The thermosetting ink mixture is heated to cure it and form an ink layer.

14. The method for repairing profiles according to any one of claims 9 to 13, characterized in that, After identifying the area to be repaired on the profile body, the process also includes cleaning the area to be repaired using ethanol or isopropanol.

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