Color-changing paint surface protective film of TPU (Thermoplastic Polyurethane) base material

Abstract

The utility model relates to a paint surface protective film, in particular to a color-changing paint surface protective film, and particularly relates to a color-changing paint surface protective film of a TPU (Thermoplastic Polyurethane) base material. The utility model aims to enrich the types of paint surface protective films, increase product characteristics and improve the application performance of products. The utility model discloses a color-changing paint surface protective film of a TPU (Thermoplastic Polyurethane) base material. The color-changing paint surface protective film comprises a protective film layer, a self-repairing coating, a color layer, a bottom color layer, a TPU film material, a mounting adhesive layer and a release material layer which are arranged in sequence. According to the color-changing paint surface protective film, the color variety of a product can be enriched, the characteristics of the product are increased, the service life of the product can be prolonged, and the service life of a color-changing film in the current market is prolonged from within 2 years to more than 5 years by combining the advantages of a color-changing film and a transparent paint surface protective film.

Description

Technical Field

[0001] The utility model relates to a paint surface protection film, in particular to a color-changing paint surface protection film, and in particular to a color-changing paint surface protection film of a TPU substrate. Background Art

[0002] At present, the conventional color-changing film on the market is made of PVC substrate, with a color layer on one side and an installation adhesive layer on the other side. It is mainly used to change the appearance of the whole car or part of the car by covering and pasting the whole car. Since the PVC substrate has good dyeing performance, it can be made into a transparent or colored substrate, and then dyed to make film materials of various colors, thereby enriching the variety of products. According to statistics, there are currently about three to five thousand types of color-changing films.

[0003] The main base material used for color-changing film is PVC film. Its advantages are cheap, rich colors, and easy construction. However, its disadvantages are that the film is relatively brittle and has a short lifespan. Generally, its service life is about 1 year. Over a long period of time, it will cause the film to weather and crack, and it will be difficult to tear off the car. It is difficult to clean with a cleaning agent, and the construction is difficult. It will seriously damage the car paint and affect the appearance of the car.

[0004] Paint protection film, also known as "invisible car cover", is a transparent protective film. It is mainly used to protect the paint appearance of automobiles and other vehicles. It has the advantages of anti-scratch and wear resistance, repairability, acid rain, bird droppings and other corrosion resistance, slowing down paint oxidation and discoloration, easy cleaning, increasing the brightness of the paint film surface, and heat insulation. With the development of technology, new functions of paint protection film are being developed more and more, upgraded products with new functions are constantly appearing, and the product variety is more abundant.

[0005] The main substrate used for paint protection film is mid-to-high-end TPU film, which has the advantages of good protection performance, no yellowing, long life, and generally more than 5 years of service life. Its disadvantages are high price, high construction technology requirements, difficulty in coloring, limited product types, and most products are transparent. Utility Model Content

[0006] In view of the advantages of the above two types of products, the utility model provides a TPU-based color-changing paint protective film, which can not only enrich the color types of the product and increase the characteristics of the product, but also increase the service life of the product. By combining the advantages of the color-changing film and the transparent paint protective film, the service life of the color-changing film currently on the market is increased from less than 2 years to more than 5 years.

[0007] To achieve the above-mentioned purpose, the utility model provides a TPU-based color-changing paint protective film, characterized in that it includes a protective film layer, a self-repairing coating, a color layer, a base color layer, a TPU film material, an installation adhesive layer, and a release material layer arranged in sequence.

[0008] The thickness of the protective film layer is 20-100 μm.

[0009] The thickness of the self-repairing coating is 2-20 μm.

[0010] The color layer has a thickness of 5-50 μm.

[0011] The thickness of the base color layer is 5-50 μm.

[0012] The TPU film material has a thickness of 100-300 μm.

[0013] The thickness of the mounting adhesive layer is 15-35 μm.

[0014] The release material layer has a thickness of 50-200 μm.

[0015] The beneficial effect of the utility model is that compared with the prior art, the utility model provides a TPU-based color-changing paint protective film, which can not only enrich the color types of the product and increase the characteristics of the product, but also increase the service life of the product. By combining the advantages of the color-changing film and the transparent paint protective film, the service life of the color-changing film currently on the market is increased from less than 2 years to more than 5 years. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a material layer structure diagram of the utility model; DETAILED DESCRIPTION

[0017] In order to more clearly illustrate the present invention, the present invention is further described below in conjunction with the accompanying drawings.

[0018] See also Figure 1 , a TPU-based color-changing paint protection film, including a protective film layer L1, a self-repairing coating L2, a color layer L3, a base color layer L4, a TPU film material L5, an installation adhesive layer L6, and a release material layer L7 arranged in sequence. The protective film layer L1 is a PET silicone protective film, a PET acrylic protective film, a PET film, and a PE electrostatic film. The self-repairing coating L2 is one or more of polyurethane resin, acrylic-polyurethane modified resin, hydroxypropylene resin, and acrylic resin. The color layer L3 is one or more of polyurethane resin, acrylic-polyurethane modified resin, hydroxypropylene resin, and acrylic resin containing pure color and gradient color pigments. The base color layer L4 is one or more of polyurethane resin, acrylic-polyurethane modified resin, hydroxypropylene resin, and acrylic resin containing pure black, white, silver pigments or no pigments. The TPU film material L5 is one of aliphatic polyester polyurethane film, aliphatic polyether polyurethane film, aromatic polyester polyurethane film, and aromatic polyether polyurethane film. The mounting adhesive layer L6 is one of single-component acrylic adhesive, two-component acrylic adhesive, silicone adhesive, and polyurethane adhesive. The release material layer L7 is one of single-sided matte silicone oil release film, double-sided matte silicone oil release film, textured silicone oil release film, and textured silicone oil release paper.

[0019] Among them, in the utility model, the protective film layer is preferably a PET silicone protective film, and more preferably a PET film. The thickness of the protective film layer is 20-100 μm, preferably 60 μm, and more preferably 50 μm.

[0020] As a further improvement of the technical solution, the self-repairing coating is preferably polyurethane resin, more preferably acrylic-polyurethane modified resin. The thickness of the self-repairing coating is 2-20 μm, preferably 7 μm, more preferably 9 μm.

[0021] As a further improvement of the technical solution, the color layer is preferably a polyurethane resin containing a pure color pigment, and more preferably an acrylic-polyurethane modified resin containing a gradient color pigment. The color layer thickness is 5-50 μm, preferably 30 μm, and more preferably 25 μm.

[0022] As a further improvement of the technical solution, the base color layer is preferably hydroxypropylene resin containing black pigment, more preferably polyurethane resin containing silver pigment. The base color layer has a thickness of 5-50 μm, preferably 20 μm, more preferably 15 μm.

[0023] As a further improvement of the technical solution, the TPU film is preferably an aliphatic polyether polyurethane film, more preferably an aliphatic polyester polyurethane film. The TPU film has a thickness of 100-300 μm, preferably 130 μm, more preferably 150 μm.

[0024] As a further improvement of the technical solution, the installation adhesive layer is preferably a two-component acrylic adhesive, more preferably a single-component acrylic adhesive. The thickness of the installation adhesive layer is 15-35 μm, preferably 25 μm, more preferably 30 μm.

[0025] As a further improvement of the technical solution, the release material layer is preferably a double-sided matte silicone oil release film, more preferably a textured silicone oil release film. The release material layer has a thickness of 50-200 μm, preferably 50 μm, and more preferably 75 μm.

[0026] At this point, the utility model provides a TPU-based color-changing paint protective film, which can not only enrich the color types of products and increase the characteristics of products, but also increase the service life of products. By combining the advantages of color-changing films and transparent paint protective films, the service life of color-changing films currently on the market is increased from less than 2 years to more than 5 years.

[0027] The utility model has no special restrictions on the sources of all raw materials, which are well known to those skilled in the art.

[0028] The preparation process of the color-changing paint protective film based on the above-mentioned TPU substrate is as follows:

[0029] Apply pressure-sensitive adhesive on the release film, compound it on the TPU film after drying, apply a base color layer on the other side of the TPU film, apply a color layer after drying, cure it after drying, apply a self-repairing coating on the color layer, compound it with a PET protective film after drying, and obtain a color-changing paint protective film based on the TPU substrate after curing.

[0030] The following is a detailed description of the preparation process of the TPU substrate color-changing paint protective film using the actual preparation process as an example:

[0031] Example 1

[0032] Coat the prepared one-component pressure-sensitive adhesive on the release surface of the 75μm double-matt single-silicone release film, dry it in a 120℃ oven for 2 minutes, the dry adhesive thickness is 25μm, and press the 150μm TPU film glossy surface (backed with a 50μm matt PET film). Peel off the backing film of the TPU film, apply the prepared black hydroxypropyl resin coating, dry it in a 110℃ oven for 3 minutes, the black base color layer thickness is 15μm, then apply the prepared blue polyurethane coating, dry it in a 100℃ oven for 3 minutes, the blue color layer thickness is 25μm, put it in a 40℃ oven for aging for 72h, then apply the prepared self-repairing coating on the blue coating, and after drying, composite PET silicone protective film, the self-repairing layer thickness is 9μm, put it in a 40℃ oven for aging for 72h, and obtain a blue paint protective film on the TPU substrate.

[0033] Example 2

[0034] Coat the prepared one-component pressure-sensitive adhesive on the release surface of the 75μm double-matt single-silicone release film, dry it in a 120℃ oven for 2 minutes, the dry adhesive thickness is 25μm, and press the 130μm TPU film glossy surface (backed with a 50μm matt PET film). Peel off the backing film of the TPU film, apply the prepared silver hydroxypropyl resin coating, dry it in a 110℃ oven for 3 minutes, the silver base color layer thickness is 15μm, then apply the prepared red polyurethane coating, dry it in a 100℃ oven for 3 minutes, the red color layer thickness is 25μm, put it in a 40℃ oven for aging for 72h, then apply the prepared self-repairing coating on the red coating, and after drying, composite PET silicone protective film, the self-repairing layer thickness is 7μm, put it in a 40℃ oven for aging for 72h, and obtain a red paint protective film on the TPU substrate.

[0035] Example 3

[0036] The prepared two-component pressure-sensitive adhesive was applied on the release surface of the 75μm textured silicone oil release film, dried in an oven at 120℃ for 3min, the dry adhesive thickness was 30μm, and the 130μm TPU film glossy surface (backed with a 50μm matte PET film) was pressed. The backing film of the TPU film was peeled off, and the prepared silver hydroxypropyl resin coating was applied, dried in an oven at 110℃ for 3min, the silver base color layer thickness was 15μm, and then the prepared brown-green polyurethane coating was applied, dried in an oven at 100℃ for 3min, the brown-green color layer thickness was 25μm, and placed in an oven at 40℃ for aging for 72h, and then the prepared self-repairing coating was applied on the brown-green coating, and after drying, the composite PET silicone protective film was prepared, the self-repairing layer thickness was 9μm, and placed in an oven at 40℃ for aging for 72h to obtain the brown-green paint surface protective film of the TPU substrate.

[0037] Comparative Example 1

[0038] Coat the prepared one-component pressure-sensitive adhesive on the release surface of the 75μm double-matt single-silicone release film, dry it in a 120℃ oven for 2 minutes, the dry adhesive thickness is 25μm, and press the 150μm TPU film glossy surface (backed with a 50μm matt PET film). Peel off the backing film of the TPU film, apply the prepared blue polyurethane coating, dry it in a 100℃ oven for 3 minutes, the blue color layer thickness is 35μm, put it in a 40℃ oven for aging for 72h, and then apply the prepared self-repairing coating on the blue coating. After drying, composite PET silicone protective film, the self-repairing layer thickness is 9μm, put it in a 40℃ oven for aging for 72h, and obtain a blue paint protective film on the TPU substrate.

[0039] The different paint protection films of the above embodiments and comparative examples were tested, and the conventional test results are shown in the following table:

[0040] / Example 1 Example 2 Example 3 Comparative Example 1 color blue red Brown to Green blue Glossiness (60° angle) 127 108 114 98 Marker pen scratch eraser Easy to erase Easy to erase Easy to erase Easy to erase Hydrophilicity Hydrophilic Hydrophilic Hydrophilic Hydrophilic Thermal repairability good good good better Tensile strength MPa 68.3 71.5 70.2 58.6 Coating elongation at break % 112 115％ 108％ 96％ Elongation at break % 295 286％ 298％ 236％ Anti-carburetor corrosion better better good better

[0041] The above table shows that, compared with the comparative example without the base color layer, the samples in the embodiments of the present invention have high gloss, high tensile strength, high elongation at break of the coating and finished product, and better overall performance.

[0042] The above disclosures are only several specific embodiments of the present invention, but the present invention is not limited thereto, and any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A color-changing paint protective film of a TPU substrate, characterized in that: It includes a protective film layer, a self-repairing coating layer, a color layer, a base color layer, a TPU film material, a mounting adhesive layer, and a release material layer arranged in sequence from top to bottom. The thickness of the protective film layer is 20-100 μm; The thickness of the self-repairing coating is 2-20 μm; The color layer has a thickness of 5-50 μm; The thickness of the base color layer is 5-50 μm; The TPU film material has a thickness of 100-300 μm; The thickness of the mounting adhesive layer is 15-35 μm; The release material layer has a thickness of 50-200 μm.

2. The color-changing paint protection film of TPU substrate according to claim 1, characterized in that: The protective film is one of PET silicone protective film, PET acrylic protective film, PET film, and PE electrostatic film.

3. The color-changing paint protective film of TPU substrate according to claim 1, characterized in that: The self-repairing coating is one of polyurethane resin, acrylic-polyurethane modified resin, hydroxypropyl resin and acrylic resin.

4. The color-changing paint protection film of TPU substrate according to claim 1, characterized in that: The color layer is one of polyurethane resin, acrylic-polyurethane modified resin, hydroxypropylene resin, and acrylic resin containing pure color and gradient color pigments.

5. The color-changing paint protection film of TPU substrate according to claim 1, characterized in that: The base color layer is one of polyurethane resin, acrylic-polyurethane modified resin, hydroxypropyl resin, and acrylic resin containing pure black, white, silver pigment or no pigment.

6. The color-changing paint protection film of TPU substrate according to claim 1, characterized in that: The TPU film material is one of aliphatic polyester polyurethane film, aliphatic polyether polyurethane film, aromatic polyester polyurethane film and aromatic polyether polyurethane film.

7. The color-changing paint protection film of TPU substrate according to claim 1, characterized in that: The installation adhesive layer is one of single-component acrylic adhesive, two-component acrylic adhesive, silicone adhesive, and polyurethane adhesive.

8. The color-changing paint protection film of TPU substrate according to claim 1, characterized in that: The release material layer is one of a single-sided matte silicone oil release film, a double-sided matte silicone oil release film, a textured silicone oil release film, and a textured silicone oil release paper.

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