Automobile film with coating with repairing function and manufacturing process of automobile film

Abstract

The invention relates to an automobile film with a repairing functional coating and a manufacturing process thereof in the field of automobile films, the automobile film with the repairing functional coating comprises a polymer PVC (polyvinyl chloride) bottom film layer, an acrylic acid pressure-sensitive adhesive layer and a pigment color layer, the polymer PVC bottom film layer is used as a matrix, the pigment color layer and the acrylic acid pressure-sensitive adhesive layer respectively cover two sides of the polymer PVC bottom film layer, and the pigment color layer and the acrylic acid pressure-sensitive adhesive layer are coated on the two sides of the polymer PVC bottom film layer. The acrylic acid pressure-sensitive adhesive layer is used for adhering the automobile film to an automobile shell, the pigment color layer is used for providing colors and patterns, the transparent polymer PVC film surface layer is arranged on one surface, far away from the polymer PVC bottom film layer, of the pigment color layer, and the transparent polymer PVC film surface layer is used for protecting the pigment color layer. The thermal repair functional coating is arranged on the face, away from the pigment color layer, of the transparent polymer PVC film surface layer, the PET transparent protective film covers the face, away from the transparent polymer PVC film surface layer, of the thermal repair functional coating, the thickness is effectively controlled while the hardness of the thermal repair functional coating is improved, and scratches generated under the same collision condition are smaller.

Description

Technical Field

[0001] The invention relates to the field of automobile films, in particular to an automobile film with a repairing functional coating and a manufacturing process thereof. Background Art

[0002] Car film is a kind of film material widely used in the field of car beauty and personalized customization. One of its main uses is to change the original body color of the car. By applying the film, car owners can easily achieve personalized customization and choose their favorite colors or patterns to make the car look more unique and fashionable. In addition to changing the color, car film can also provide a variety of decorative effects, such as high gloss, matte, metallic texture, carbon fiber texture, etc., to further enrich the appearance of the car. After use, it can isolate harmful factors such as air, moisture and ultraviolet rays from direct contact with the car paint, reduce the oxidation and corrosion of the car paint, and extend the service life of the car paint. The surface of the car body after the film is smoother, less prone to dust and stains, and easier to clean. Compared with spray painting, car film has lower cost and is easy to replace and restore the original appearance of the vehicle.

[0003] Car films usually include: a wear-resistant outer layer, which is made of wear-resistant polyurethane or transparent acrylic, and can resist friction damage during daily scrubbing and washing; a safety base layer, which is made of high-strength, high-transparency PET polyester material, has very strong impact resistance, and can effectively filter sunlight and glare from the high beams of oncoming vehicles; an adhesive layer, which mainly plays a bonding role, tightly bonding the different layers of the car film together to form a whole.

[0004] The hardness of the thermal repair coating in the existing automotive film is poor, and it is easy to have scratches that are too deep and cannot be completely repaired. Thickening the thermal repair coating can reduce the occurrence of this situation, but too thick a thermal repair coating may lead to poor interface bonding with the substrate, because the stress inside the coating may be too large, causing the coating to peel or fall off at the interface. Too thick a coating may cause internal stress during the drying and curing process, which in turn causes cracking and delamination of the coating. This will not only affect the appearance quality of the coating, but also reduce its service life and performance. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art solutions, the present invention provides an automobile film with a repair functional coating and a manufacturing process thereof, which can effectively solve the technical problem of insufficient coating hardness.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] An automobile film with a repair function coating comprises a polymer PVC base film layer, an acrylic pressure-sensitive adhesive layer and a pigment color layer, wherein the polymer PVC base film layer is used as a matrix, the pigment color layer and the acrylic pressure-sensitive adhesive layer respectively cover two sides of the polymer PVC base film layer, the acrylic pressure-sensitive adhesive layer is used to adhere the automobile film to the car shell, the pigment color layer is used to provide color and pattern, a transparent polymer PVC film surface layer is provided on the side of the pigment color layer away from the polymer PVC base film layer, the transparent polymer PVC film surface layer is used to protect the pigment color layer, a heat-repair function coating is provided on the side of the transparent polymer PVC film surface layer away from the pigment color layer, a PET transparent protective film is covered on the side of the heat-repair function coating away from the transparent polymer PVC film surface layer, the heat-repair function coating can repair scratches on itself and fill scratches on the transparent polymer PVC film surface layer, and a PET release layer is adhered on the side of the acrylic pressure-sensitive adhesive layer away from the polymer PVC base film layer;

[0008] The thermal repair functional coating comprises the following raw materials in parts by weight: 30-40 parts of polyurethane acrylic resin, 20-30 parts of thermoplastic polyurethane, 5-10 parts of nano silicon dioxide and 2-5 parts of thermal repair accelerator;

[0009] The steps for preparing the thermal repair functional coating include:

[0010] Step S1, preheating the reactor to 50-80° C., adding polyurethane acrylic resin and thermoplastic polyurethane into the reactor in proportion, maintaining the pressure of -0.1--0.2 kPa and the temperature of 100-120° C. in the reactor for mixing and stirring for 2-4 hours, thereby obtaining a base resin;

[0011] Step S2, adding nano-silicon dioxide into the reaction kettle, increasing the stirring speed of the reaction kettle, stirring at a stirring speed of 3000-6000 rpm for 6-8 hours, and uniformly dispersing the nano-silicon dioxide in the base resin;

[0012] Step S3, keeping the reactor in a stirring state, adding a thermal repair accelerator during the stirring process, and taking out the mixture after stirring for 5-8 minutes to obtain a thermal repair functional coating;

[0013] Step S4, packing the thermal repair functional coating obtained in step S3 into barrels for later use.

[0014] Furthermore, the thickness of the PET transparent protective film is 0.025-0.05mm, the thickness of the coating with thermal repair function is 0.01-0.03mm, the thickness of the pigment color layer is 0.01-0.02mm, the thickness of the polymer PVC base film layer is 0.06mm-0.15mm, the thickness of the transparent polymer PVC mask is 0.06-0.15mm, the thickness of the acrylic pressure-sensitive adhesive layer is 0.03-0.045mm, and the thickness of the PET release film layer is 0.12-0.25mm.

[0015] Furthermore, the PET transparent protective film is a polyethylene terephthalate film, and the thermal repair accelerator is composed of a mixture of titanate, an organic solvent, a base resin and an anhydride curing agent.

[0016] Furthermore, an ultraviolet reflection layer is arranged on the polymer PVC bottom film layer, and the ultraviolet reflection layer adopts a vacuum evaporation coating process to uniformly cover the metal particles or ceramic particles on the polymer PVC bottom film layer.

[0017] Furthermore, the thermal repair functional coating further comprises 1-2 parts by weight of a defoaming agent, and the defoaming agent is added into the reactor together with the polyurethane acrylic resin and the thermoplastic polyurethane according to a proportion in the thermal repair functional coating preparation step S1.

[0018] Furthermore, the thermal repair functional coating further comprises 20-30 parts by weight of epoxy resin, and the epoxy resin is added into the reaction kettle together with the polyurethane acrylic resin and thermoplastic polyurethane according to a certain proportion in the thermal repair functional coating preparation step S1.

[0019] The manufacturing process of the automobile film with a repair functional coating includes the following steps:

[0020] Step 1: The pigment color layer is coated on the upper surface of the polymer PVC base film layer;

[0021] Step 2, covering the transparent polymer PVC film surface layer on the upper surface of the pigment color layer by heat bonding;

[0022] Step 3, the acrylic pressure-sensitive adhesive layer is coated on the PET release layer, and the PET release layer is then laminated to the lower surface of the polymer PVC base film layer on one side with the acrylic pressure-sensitive adhesive layer by transfer coating;

[0023] Step 4: The heat-repair functional coating is coated on the PET transparent protective film, and then the PET transparent protective film coated with the heat-repair functional coating is covered on the side of the transparent polymer PVC film layer away from the pigment color layer by transfer coating.

[0024] Furthermore, after the transparent polymer PVC film surface layer covers the pigment color layer in step 2, the pigment color layer is surface treated and irradiated for 25-50 seconds by ultraviolet curing technology to enhance the bonding strength between the pigment color layer and the transparent polymer PVC film surface layer and the polymer PVC bottom film layer.

[0025] Furthermore, the pigment color layer is covered on the upper surface of the polymer PVC base film layer by a multi-stage coating method. The pigment color layer includes a bottom layer, an intermediate color layer and a surface layer. First, a thin layer of pigment is evenly coated on the upper surface of the polymer PVC base film layer by a precision coating machine to form a bottom layer. After the bottom layer is completely dried and cured, the intermediate color layer is coated on its surface. After the intermediate layer is dried and preliminarily cured, the surface layer is coated.

[0026] Furthermore, after the base layer, the middle color layer and the surface layer are coated, they all need to be dried and cured. The drying process can be carried out by hot air circulation or infrared radiation to accelerate the evaporation of the solvent and the curing of the pigment.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows: the thermal repair functional coating enables the automobile film to have an automatic repair function. When scratches occur on the surface of the automobile film, the thermal repair coating can automatically repair the fine scratches on the surface of the automobile film at a certain temperature. The thermoplastic polyurethane in the coating can maintain a certain elasticity when scratched by external force, and the molecular structure of the thermoplastic polyurethane is tight, so that the scratches will not be too deep. After the temperature of the thermoplastic polyurethane is increased by sun exposure or hot water, the destroyed molecular structure will automatically recover, thereby achieving the effect of repairing scratches. The addition of nano-silicon dioxide can significantly improve the hardness and wear resistance of the coating, while maintaining the transparency of the coating. While improving the hardness of the thermal repair functional coating, the thickness is effectively controlled. The scratches that appear under the same collision situation are smaller. The thermal repair accelerator can accelerate the chemical reaction of the coating when heated, significantly improve the thermal repair efficiency of the coating, and enable the coating to recover in a shorter time. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0029] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0030] Numbers in the figure: 1-PET transparent protective film, 2-thermal repair functional coating, 3-transparent polymer PVC film surface layer, 4-pigment color layer, 5-polymer PVC bottom film layer, 6-acrylic pressure-sensitive adhesive layer, 7-PET release layer, 8-ultraviolet reflection layer. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Embodiment 1

[0033] The automobile film with a repair function coating comprises a polymer PVC base film layer 5, an acrylic pressure-sensitive adhesive layer 6 and a pigment color layer 4. The polymer PVC base film layer 5 is used as a matrix, and the pigment color layer 4 and the acrylic pressure-sensitive adhesive layer 6 respectively cover two sides of the polymer PVC base film layer 5. The acrylic pressure-sensitive adhesive layer 6 is used to stick the automobile film to the car shell, and the pigment color layer 4 is used to provide color and pattern. The side of the pigment color layer 4 away from the polymer PVC base film layer 5 is provided with a transparent polymer PVC film surface layer 3, and the transparent polymer PVC film surface layer 3 is used to protect the pigment color layer 4. The side of the transparent polymer PVC film surface layer 3 away from the pigment color layer 4 is provided with a thermal repair function coating 2. The side of the heat-repair functional coating 2 away from the transparent polymer PVC film surface layer 3 is covered with a PET transparent protective film 1. When the heat-repair functional coating 2 is damaged, it can be repaired by heating, and when the scratch is deep, it can also fill the scratch on the transparent polymer PVC film surface layer 3. The acrylic pressure-sensitive adhesive layer 6 is away from the polymer PVC bottom film layer 5 and is adhered with a PET release layer 7. Before use, the automotive film is used to protect the heat-repair functional coating 2, and the polymer PVC bottom film layer 5 is used to protect the acrylic pressure-sensitive adhesive layer 6. When in use, the polymer PVC bottom film layer 5 is first torn off and then pasted on the surface of the car through the acrylic pressure-sensitive adhesive layer 6. After pasting, the PET transparent protective film 1 is torn off.

[0034] PET film has good mechanical properties and good folding resistance. Its tensile strength is comparable to that of aluminum foil, 9 times that of polyethylene, 3 times that of polycarbonate and nylon. It has high transparency, can block ultraviolet rays, and has good gloss. The transmittance of PVC film to natural light can reach 25%. The transmitted light produces uniform diffuse light inside the structure, without shadows or glare, and has good color rendering. At the same time, when used in combination with PET film, it can also filter out most of the ultraviolet rays and prevent the pigment color layer 4 from fading.

[0035] The manufacturing process of the automobile film with a repair functional coating includes the following steps:

[0036] Step 1: The pigment color layer 4 is coated on the upper surface of the polymer PVC bottom film layer 5. The thickness of the polymer PVC bottom film layer 5 is 0.06 mm, and the thickness of the pigment color layer 4 is 0.02 mm.

[0037] Step 2, covering the transparent polymer PVC film surface layer 3 on the upper surface of the pigment color layer 4 by heat bonding, the transparent polymer PVC film layer 3 has a thickness of 0.06 mm, and after the transparent polymer PVC film surface layer 3 covers the pigment color layer 4, the pigment color layer 4 is surface treated, and the pigment color layer 4 is irradiated for 45 seconds by ultraviolet curing technology to enhance the bonding force between the pigment color layer 4 and the transparent polymer PVC film surface layer 3 and the polymer PVC bottom film layer 5;

[0038] Step 3, the acrylic pressure-sensitive adhesive layer 6 is coated on the PET release layer 7, and the PET release layer 7 is then transferred to the lower surface of the polymer PVC bottom film layer 5 by transferring the acrylic pressure-sensitive adhesive layer 6. The acrylic pressure-sensitive adhesive layer 6 has a thickness of 0.045 mm, and the PET release film layer has a thickness of 0.25 mm.

[0039] Step 4, the thermal repair functional coating 2 is coated on the PET transparent protective film 1, and then the PET transparent protective film 1 coated with the thermal repair functional coating 2 is covered on the side of the transparent polymer PVC film surface layer 3 away from the pigment color layer 4 by transfer coating. The thickness of the PET transparent protective film 1 is 0.05 mm, and the thickness of the thermal repair functional coating is 0.015 mm. Transfer coating can easily achieve colorful and high-gloss printing effects on a flat surface, and has good environmental resistance and light resistance.

[0040] The thermal repair functional coating 2 comprises the following raw materials in parts by weight: 40 parts of polyurethane acrylic resin, 30 parts of thermoplastic polyurethane, 10 parts of nano-silicon dioxide and 2 parts of thermal repair accelerator;

[0041] The preparation steps of the thermal repair functional coating 2 include:

[0042] Step S1, preheating the reactor to 50° C., adding polyurethane acrylic resin and thermoplastic polyurethane into the reactor in proportion, maintaining the pressure of -0.1 kPa and the temperature of 100° C. in the reactor for mixing and stirring for 2 hours, thereby obtaining a base resin;

[0043] Step S2, adding nano-silicon dioxide into the reaction kettle, increasing the stirring speed of the reaction kettle, stirring at a stirring speed of 40,000 rpm for 6 hours, and uniformly dispersing the nano-silicon dioxide in the base resin;

[0044] Step S3, keeping the reactor in a stirring state, adding a thermal repair accelerator during the stirring process, and taking out the mixture after stirring for 5 minutes to obtain a thermal repair functional coating;

[0045] Step S4, packing the thermal repair functional coating obtained in step S3 into barrels for later use.

[0046] As the main film-forming substance of the coating, polyurethane acrylic resin provides the coating with basic physical and chemical properties. Thermoplastic polyurethane is a polymer material with excellent elasticity, wear resistance and chemical corrosion resistance. Nano-silica is an inorganic nano-material with high hardness, high transparency and excellent dispersibility. The thermal repair accelerator is a substance that can accelerate the chemical reaction of the coating when heated. The thermal repair accelerator is composed of a mixture of titanate, organic solvent, base resin and anhydride curing agent, which can produce ester exchange reaction and polycondensation reaction. When the automobile film is slightly scratched or damaged, the polyurethane acrylic resin and TPU in the thermal repair functional coating 2 will undergo reversible deformation, so that the coating at the scratched or damaged area can gradually recover. At the same time, the addition of nano-silica can significantly improve the hardness and wear resistance of the coating, preventing the further expansion of scratches or damage. The addition of the thermal repair accelerator can accelerate this repair process, so that the coating can be restored to its original state in a shorter time.

[0047] The automotive film with a repair function coating provided by the present invention has excellent self-repairing ability, which can significantly improve the service life and aesthetics of the automotive film. The composition and proportion of the heat repair function coating 2 are carefully designed to ensure that the coating can undergo reversible deformation and achieve self-repair when heated. In addition, the automotive film also has good flexibility and weather resistance, and is suitable for various harsh environments.

[0048] Embodiment 2

[0049] The difference from the first embodiment is that an ultraviolet reflection layer 8 is provided on the polymer PVC bottom film layer 5. Before step 1 of the manufacturing process of the automobile film with a repair function coating, the ultraviolet reflection layer 8 uses a vacuum evaporation coating process to evenly cover the metal particles or ceramic particles on the polymer PVC bottom film layer 5. The pigment color layer 4 is covered on the upper surface of the polymer PVC bottom film layer 5 by a multi-stage coating method. The pigment color layer 4 includes a bottom layer, an intermediate color layer and a surface layer. First, a thin layer of pigment is evenly coated on the upper surface of the polymer PVC bottom film layer 5 by a precision coating machine to form a bottom layer. This layer serves as the basis of the color layer. The main purpose is to improve color adhesion and increase color saturation. After the bottom layer is completely dried and cured, the intermediate color layer is applied on its surface. This layer can add pigments of different colors or tones as needed. By accurately controlling the coating thickness and pigment ratio, the layering and transition effect of the color can be achieved. After the intermediate layer is dried and initially cured, the surface layer is applied. The surface pigment color layer is mainly responsible for improving the glossiness of the color. After the bottom layer, the intermediate color layer and the surface layer are coated, they all need to be dried and cured. The drying process can use hot air circulation or infrared radiation to accelerate the evaporation of the solvent and the curing of the pigment. The curing process ensures that the pigment color layer 4 and the polymer PVC bottom film layer 5 form a strong bond, improving the stability of the overall structure. By adopting a multi-stage layered coating process, precise control of the pigment color layer can be achieved, making the color more vivid, full and lasting.

[0050] The thermal repair functional coating 2 is also added with 2 parts by weight of a defoamer and 20 parts by weight of an epoxy resin.

[0051] The preparation steps of the thermal repair functional coating 2 include:

[0052] Step S1, preheating the reactor to 60° C., adding epoxy resin, defoaming agent, polyurethane acrylic resin and thermoplastic polyurethane into the reactor in proportion, maintaining the pressure of -0.1 kPa and the temperature of 120° C. in the reactor for mixing and stirring for 4 hours, thereby obtaining a base resin;

[0053] Step S2, adding nano-silicon dioxide into the reaction kettle, increasing the stirring speed of the reaction kettle, stirring at a stirring speed of 40000 rpm for 8 hours, and uniformly dispersing the nano-silicon dioxide in the base resin;

[0054] Step S3, keeping the reactor in a stirring state, adding a thermal repair accelerator during the stirring process, and taking out the mixture after stirring for 5 minutes to obtain a thermal repair functional coating;

[0055] Step S4, uniformly coating the thermal repair functional coating obtained in step S3 on the release paper by a coating machine, and rolling up the release paper coated with the thermal repair functional coating for standby use.

[0056] The thickness of the coating with thermal repair function in this embodiment is 0.03 mm.

[0057] The thermal repair functional coating 2 enables the automobile film to have an automatic repair function. When scratches occur on the surface of the automobile film, the thermal repair coating can automatically repair the fine scratches on the surface of the automobile film at a certain temperature. The thermoplastic polyurethane in the coating can maintain a certain elasticity when scratched by external force, and the molecular structure of the thermoplastic polyurethane is tight, so that the scratches will not be too deep. After the temperature of the thermoplastic polyurethane is increased by sun exposure or hot water, the damaged molecular structure will automatically recover, thereby achieving the effect of repairing scratches. The addition of nano-silicon dioxide can significantly improve the hardness and wear resistance of the coating while maintaining the transparency of the coating. The thermal repair accelerator can accelerate the chemical reaction of the coating when heated, significantly improve the thermal repair efficiency of the coating, and enable the coating to recover in a shorter time. The defoaming agent effectively reduces the bubble content in the thermal repair coating 2 and improves the production quality. The epoxy resin can further improve the hardness of the thermal repair functional coating 2.

[0058] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. An automobile film with a repair function coating, comprising a polymer PVC base film layer, an acrylic pressure-sensitive adhesive layer and a pigment color layer, with the polymer PVC base film layer as a matrix, the pigment color layer and the acrylic pressure-sensitive adhesive layer respectively covering the two sides of the polymer PVC base film layer, the acrylic pressure-sensitive adhesive layer being used to adhere the automobile film to the automobile shell, and the pigment color layer being used to provide color and pattern, characterized in that: The side of the pigment color layer away from the polymer PVC bottom film layer is provided with a transparent polymer PVC film surface layer, the transparent polymer PVC film surface layer is used to protect the pigment color layer, the side of the transparent polymer PVC film surface layer away from the pigment color layer is provided with a heat repair functional coating, the side of the heat repair functional coating away from the transparent polymer PVC film surface layer is covered with a PET transparent protective film, the heat repair functional coating can repair scratches on itself and fill scratches on the transparent polymer PVC film surface layer, and the side of the acrylic pressure-sensitive adhesive layer away from the polymer PVC bottom film layer is adhered with a PET release layer; The thermal repair functional coating comprises the following raw materials in parts by weight: 30-40 parts of polyurethane acrylic resin, 20-30 parts of thermoplastic polyurethane, 5-10 parts of nano silicon dioxide and 2-5 parts of thermal repair accelerator; The steps for preparing the thermal repair functional coating include: Step S1, preheating the reactor to 50-80° C., adding polyurethane acrylic resin and thermoplastic polyurethane into the reactor in proportion, maintaining the pressure of -0.1--0.2 kPa and the temperature of 100-120° C. in the reactor for mixing and stirring for 2-4 hours, thereby obtaining a base resin; Step S2, adding nano-silicon dioxide into the reaction kettle, increasing the stirring speed of the reaction kettle, stirring at a stirring speed of 3000-6000 rpm for 6-8 hours, and uniformly dispersing the nano-silicon dioxide in the base resin; Step S3, keeping the reactor in a stirring state, adding a thermal repair accelerator during the stirring process, and taking out the mixture after stirring for 5-8 minutes to obtain a thermal repair functional coating; Step S4, packing the thermal repair functional coating obtained in step S3 into barrels for later use.

2. The automotive film with a repair functional coating according to claim 1, characterized in that: The thickness of the PET transparent protective film is 0.025-0.05mm, the thickness of the coating with heat repair function is 0.01-0.03mm, the thickness of the pigment color layer is 0.01-0.02mm, the thickness of the polymer PVC base film layer is 0.06mm-0.15mm, the thickness of the transparent polymer PVC face film is 0.06-0.15mm, the thickness of the acrylic pressure-sensitive adhesive layer is 0.03-0.045mm, and the thickness of the PET release film layer is 0.12-0.25mm.

3. The automotive film with a repair functional coating according to claim 1, characterized in that: The PET transparent protective film is a polyethylene terephthalate film, and the thermal repair accelerator is composed of a mixture of titanate, an organic solvent, a base resin and an acid anhydride curing agent.

4. The automotive film with a repair functional coating according to claim 1, characterized in that: The polymer PVC bottom film layer is provided with an ultraviolet reflection layer, and the ultraviolet reflection layer uses a vacuum evaporation coating process to uniformly cover the metal particles or ceramic particles on the polymer PVC bottom film layer.

5. The automobile film with a repair functional coating according to claim 1, characterized in that: The thermal repair functional coating further comprises 1-2 parts by weight of a defoaming agent, and the defoaming agent is added into the reactor together with the polyurethane acrylic resin and the thermoplastic polyurethane according to a certain proportion in the thermal repair functional coating preparation step S1.

6. The automobile film with a repair functional coating according to claim 1, characterized in that: The thermal repair functional coating further comprises 20-30 parts by weight of epoxy resin. In the thermal repair functional coating preparation step S1, the epoxy resin is added into the reaction kettle together with the polyurethane acrylic resin and the thermoplastic polyurethane according to a certain proportion.

7. The manufacturing process of the automobile film with a repair function coating is characterized by: The method for producing the automotive film with a repair functional coating according to claims 1 to 6 comprises the following steps: Step 1: The pigment color layer is coated on the upper surface of the polymer PVC base film layer; Step 2, covering the transparent polymer PVC film surface layer on the upper surface of the pigment color layer by heat bonding; Step 3, the acrylic pressure-sensitive adhesive layer is coated on the PET release layer, and the PET release layer is then laminated to the lower surface of the polymer PVC base film layer on one side with the acrylic pressure-sensitive adhesive layer by transfer coating; Step 4: The heat-repair functional coating is coated on the PET transparent protective film, and then the PET transparent protective film coated with the heat-repair functional coating is covered on the side of the transparent polymer PVC film layer away from the pigment color layer by transfer coating.

8. The process for manufacturing the automobile film with a repair functional coating according to claim 7, characterized in that: After the transparent polymer PVC film surface layer covers the pigment color layer in step 2, the pigment color layer is surface treated and irradiated for 25-50 seconds by ultraviolet curing technology to enhance the bonding between the pigment color layer and the transparent polymer PVC film surface layer and the polymer PVC bottom film layer.

9. The process for manufacturing the automobile film with a repair functional coating according to claim 7, characterized in that: The pigment color layer is covered on the upper surface of the polymer PVC base film layer by a multi-stage coating method. The pigment color layer includes a base layer, an intermediate color layer and a surface layer. First, a thin layer of pigment is evenly coated on the upper surface of the polymer PVC base film layer by a precision coating machine to form a base layer. After the base layer coating is completely dried and cured, the intermediate color layer is coated on its surface. After the intermediate layer coating is dried and preliminarily cured, the surface layer is coated.

10. The process for manufacturing the automobile film with a repair functional coating according to claim 9, characterized in that: After the base layer, middle color layer and surface layer are coated, they all need to be dried and cured. The drying process can use hot air circulation or infrared radiation to accelerate solvent evaporation and pigment curing.

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