TPU starry sky top film

Abstract

The utility model provides a TPU starry sky top film. The TPU starry sky top film comprises a protective film layer, a coating, a first base material layer, a first mounting adhesive layer, a starry sky pattern layer, a second base material layer, a second mounting adhesive layer and a release film layer which are sequentially stacked, the thickness of the protective film layer is 2-188 microns; the thickness of the coating is 2-30 [mu] m; the thickness of the first base material layer is 50-500 [mu] m; the thickness of the first mounting adhesive layer is 2-50 [mu] m; the thickness of the starry sky pattern layer is 0.1-10 [mu] m; the thickness of the second base material layer is 50-500 [mu] m; the thickness of the second mounting adhesive layer is 2-50 [mu] m; and the thickness of the release film layer is 5-188 microns. The TPU starry sky top film can be pasted on the surface of the inner side of the automobile roof skylight glass, the starry sky pattern layer can be protected by utilizing the TPU layer, meanwhile, the problem that the starry sky top film falls off from the automobile roof skylight glass is solved, and the TPU starry sky top film can be conveniently pasted on the skylight glass during construction.

Description

Technical Field

[0001] This utility model relates to the field of heat insulation film technology, specifically to a TPU starry sky roof film for the inner surface of automotive sunroof glass. Background Technology

[0002] The emergence of starry sky roof films for car sunroofs has been very popular. Most commercially available starry sky roof films are applied to the inside of the car window. They work by shining light onto photosensitive ink that creates the starry sky pattern. However, traditional starry sky roof films use a PC (polycarbonate) light guide plate, which has a different shrinkage rate than the upper and lower PET film layers when heated. This can cause the PC plate to separate from the middle of the film, resulting in it peeling off the sunroof surface. Furthermore, the high hardness of PC makes installation difficult, time-consuming, and labor-intensive. Therefore, we propose a TPU starry sky roof film to solve these problems. Utility Model Content

[0003] To address the shortcomings of the existing technology, this invention provides a TPU starry sky roof film and its preparation method. This invention enables the TPU starry sky roof film to be applied to the inner surface of a car sunroof. The TPU layer protects the starry sky top layer, while the starry sky pattern layer is printed on the TPU layer, using the same material and heat shrinkage rate as the upper TPU layer. This prevents the film from separating from the middle due to heat shrinkage, solving the problem of detachment from the car sunroof and facilitating installation on the sunroof glass.

[0004] This utility model provides a TPU starry sky top film, which includes a protective film layer, a coating layer, a first substrate layer, a first adhesive layer, a starry sky pattern layer, a second substrate layer, a second adhesive layer, and a release film layer stacked sequentially. The coating layer is provided with a protective film layer on top, the coating layer is provided with a first substrate layer at the bottom, the first substrate layer is provided with a first adhesive layer at the bottom, the first adhesive layer is provided with a starry sky pattern layer at the bottom, the starry sky pattern layer is provided with a second substrate layer at the bottom, the second substrate layer is provided with a second adhesive layer at the bottom, and the second adhesive layer is provided with a release film layer at the bottom.

[0005] The protective film layer has a thickness of 2 to 188 μm; preferably 20 to 125 μm, and more preferably 16 to 75 μm; the material of the protective film layer is one of PET, PE, or OPP (transparent or translucent or colored polyester film), and it serves to protect the coating underneath.

[0006] The coating has a thickness of 2–30 μm, preferably 2–20 μm, and more preferably 5–10 μm. The coating material includes, but is not limited to, highly cross-linked polymer coatings, thermosetting acrylate coatings, thermosetting sol-gel coatings based on silicates / titaniumates / zirconates or mixtures thereof, mixed organic-inorganic sol-gel materials (e.g., polymers from Fraunhofer®), and thermosetting siloxane hard coatings, exhibiting scratch self-healing and anti-scratch effects. Preferably, the coating uses a Japanese Kasho coating with a hardness up to 4H. It is a dense nano-coating with excellent mirror finish and superhydrophobicity, effectively preventing contaminant corrosion and acid / alkali corrosion, and exhibiting scratch self-healing and anti-scratch effects; the coating thickness is 2–8 μm.

[0007] The first substrate layer has a thickness of 50–500 μm, preferably 100–300 μm, and more preferably 150–200 μm. The material of the first substrate layer is TPU (thermoplastic polyurethane elastomer), TPH (thermoplastic plastic elastomer), PET, or PP. TPU is a thermoplastic polyurethane elastomer, a polymer material formed by the reaction and polymerization of diphenylmethane diisocyanate (MDI) or toluene diisocyanate (TDI) with macromolecular polyols and low-molecular-weight polyols (chain extenders). TPU has a wide hardness range, is wear-resistant, oil-resistant, transparent, and has good elasticity, and is widely used in daily necessities, sporting goods, toys, and decorative materials. TPH is a thermoplastic plastic elastomer, a high-strength, high-water-resistant, and high-wear-resistant elastic material. It can withstand extreme temperatures, pressures, and chemical corrosion while maintaining excellent physical properties. PET film, also known as high-temperature resistant polyester film, possesses excellent physical and chemical properties, dimensional stability, transparency, and recyclability. It also exhibits superior mechanical properties, boasting the best toughness among all thermoplastics. Its tensile strength and impact strength are significantly higher than those of ordinary films, with good stiffness, dimensional stability, and excellent heat and cold resistance, as well as good chemical and oil resistance. PP film is divided into unstretched polypropylene film and biaxially oriented polypropylene film. Unstretched polypropylene film includes blown polypropylene film (IPP) produced by extrusion blow molding and cast polypropylene film (CPP) produced by T-die process. Biaxially oriented polypropylene film (BOPP) is a new type of film developed to replace cellophane, characterized by high mechanical strength, good toughness, and good transparency and gloss. Preferably, the material of the first substrate layer is TPU or TPH; more preferably, the material of the first substrate layer is TPU.

[0008] The first mounting adhesive layer (also called the pressure-sensitive adhesive layer) has a thickness of 2–50 μm, preferably 10–40 μm; more preferably 20–30 μm. The material of the first mounting adhesive layer is an acrylic pressure-sensitive adhesive layer. Pressure-sensitive adhesives can be divided into two categories according to their main resin composition: rubber-based and resin-based. Rubber-based adhesives can be further divided into natural rubber and synthetic rubber types; resin-based adhesives mainly include acrylic, silicone, and polyurethane types. Rubber-based pressure-sensitive adhesives, in addition to rubber as the main component, also require the addition of other auxiliary components, such as tackifying resins, plasticizers, fillers, viscosity modifiers, vulcanizing agents, antioxidants, and solvents. Resin-based pressure-sensitive adhesives, in addition to the main resin, also require the addition of defoamers, leveling agents, wetting agents, and other additives. The function of the first mounting adhesive layer is to bond the first substrate layer and the starry sky pattern layer together.

[0009] The starry sky pattern layer has a thickness of 0.1–10 μm, preferably 0.3–5 μm, and even more preferably 0.5–1 μm. The ink in the starry sky pattern layer is a photosensitive ink used in screen printing machines, which serves a reflective function.

[0010] The second substrate layer has a thickness of 50-500 μm, preferably 150-400 μm, and more preferably 200-300 μm. The material properties of the second substrate layer are the same as those of the first substrate layer. The material of the second substrate layer is preferably TPU.

[0011] The second mounting adhesive layer (also known as a pressure-sensitive adhesive layer) has a thickness of 2–50 μm, preferably 2–35 μm, more preferably 6–30 μm, further preferably 10–30 μm, and even more preferably 15–25 μm; its material properties are the same as those of the first mounting adhesive layer. The function of the second mounting adhesive layer is to bond the second substrate layer and the release film layer together.

[0012] The release film layer has a thickness of 5–188 μm, preferably 12–188 μm, more preferably 12–125 μm, and even more preferably 23–75 μm. The material of the release film layer is one of PET, PE, or OPP (transparent, translucent, or colored polyester film). The release film is made by coating a silicone release agent onto the surface of an environmentally friendly PET, PE, or OPP film, allowing it to exhibit extremely light and stable release force for various organic pressure-sensitive adhesives. Different organic pressure-sensitive adhesives, such as hot melt adhesives, acrylic adhesives, and rubber-based pressure-sensitive adhesives, require different release forces. The release force is adjusted accordingly based on the different adhesive properties of the product being released, achieving an extremely light and stable release force during peeling. The preferred material for the release film layer is PET.

[0013] The beneficial effects of this utility model are as follows:

[0014] This utility model provides a TPU starry sky roof film, which is applied to the inner surface of the sunroof glass of a car. The TPU layer can protect the starry sky top layer, and the starry sky pattern layer is printed on the TPU layer. It is made of the same material as the upper TPU layer and has the same heat shrinkage rate, so it will not separate from the middle of the film due to heat shrinkage. This solves the problem of falling off the sunroof glass of the car and is convenient to install on the sunroof glass. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the TPU starry sky top film in an embodiment of this utility model.

[0016] Explanation of key component symbols:

[0017] Detailed Implementation

[0018] To more clearly illustrate the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described with reference to the accompanying drawings.

[0019] The following details the preparation steps of a TPU starry sky roof film according to this utility model:

[0020] (1) First, a transparent TPU film is made using a casting process as the first substrate layer 3;

[0021] (2) A pressure-sensitive adhesive layer (first mounting adhesive layer 4) is applied to one side of the first substrate layer 3 by a winding coating bonding line. During the process, it is stretched without deformation under a tension of 250-300N. Then, a pressure-sensitive adhesive layer is applied to the surface of the first substrate layer 3. The coating is applied by roller coating and then dried in an oven. The length of each of the seven oven sections is 4 meters, and the total length of the oven is 28 meters. The temperatures are set as follows: 70℃ for the first section, 80℃ for the second section, 90℃ for the third section, 105℃ for the fourth section, 115℃ for the fifth section, 125℃ for the sixth section, and 90℃ for the seventh section. The baking time is 13 meters / minute.

[0022] (3) After drying out of the oven, a release film layer is laminated on one side of the first adhesive layer 4 by mirror rolling to make a TPU semi-finished film; the release film layer material is PET release film;

[0023] (4) Coating 2 is applied to the other side of the first substrate layer 3 by means of a screw, and then applied by roller coating and dried in an oven. The length of each of the seven oven sections is 4 meters, and the total length of the oven is 28 meters. The temperatures are set as follows: 60℃ for the first section, 70℃ for the second section, 80℃ for the third section, 90℃ for the fourth section, 110℃ for the fifth section, 120℃ for the sixth section, and 90℃ for the seventh section. The baking time is 7 meters / minute. After drying, coating 2 is formed.

[0024] (5) After drying out of the oven, a protective film layer 1 is applied by mirror rolling. The material of the protective film layer 1 is PET, PE or OPP film.

[0025] (6) A transparent TPU film is then produced using a casting process as the second substrate layer 6;

[0026] (7) Apply a pressure-sensitive adhesive layer (second mounting adhesive layer 7) to one side of the second substrate layer 6 by means of a winding coating bonding line. During the process, the adhesive layer is stretched without deformation under a tension of 250-300N. Then apply a pressure-sensitive adhesive layer to the surface of the second substrate layer 6 by roller coating and drying in an oven. The length of each of the seven oven sections is 4 meters, and the total length of the oven is 28 meters. The temperatures are set as follows: 70℃ for the first section, 80℃ for the second section, 90℃ for the third section, 105℃ for the fourth section, 115℃ for the fifth section, 125℃ for the sixth section, and 90℃ for the seventh section. The baking time is 13 meters / minute.

[0027] (8) After drying out of the oven, release film layer 8 is laminated by mirror roller bonding. The material of release film layer 8 is PET release film.

[0028] (9) A layer of photosensitive ink is printed on the other side of the second substrate layer 6 using a screen printing machine, and then dried in a dryer to form a starry sky pattern layer 5; thus producing a starry sky top semi-finished film.

[0029] (10) Peel off the release film that is bonded to the first mounting adhesive layer 4 under the TPU semi-finished film using a coating machine;

[0030] (11) By means of mirror rolling bonding, TPU semi-finished film and starry sky top semi-finished film are bonded together, and the first installation adhesive layer 4 of TPU semi-finished film is bonded to the starry sky pattern layer 5 of starry sky top semi-finished film to form TPU starry sky top film.

[0031] Following the above-described preparation steps for the TPU starry sky top film, this invention can produce finished products with different film thicknesses by adjusting the coating speed of the film layer and the parameters of the spraying or scraping machine, including the following examples.

[0032] Example 1

[0033] In this embodiment, the TPU starry sky top film comprises the following layers stacked sequentially:

[0034] (1) A protective film layer with a thickness of 5 μm; the material of the protective film layer is PET;

[0035] (2) Coating with a thickness of 2μm; the coating uses Japanese Kasho coating;

[0036] (3) The first substrate layer has a thickness of 50 μm; the material of the first substrate layer is TPU;

[0037] (4) The first mounting adhesive layer has a thickness of 2μm; the material of the first mounting adhesive layer is an acrylic pressure-sensitive adhesive layer;

[0038] (5) The starry sky pattern layer has a thickness of 0.1 μm; the ink used for the starry sky pattern layer is the photosensitive ink used in screen printing machines;

[0039] (6) The second substrate layer has a thickness of 50 μm; the material of the second substrate layer is TPU;

[0040] (7) The second mounting adhesive layer has a thickness of 2μm; the material of the second mounting adhesive layer is an acrylic pressure-sensitive adhesive layer;

[0041] (8) Release film layer, the thickness of which is 12μm; the material of the release film layer is PET.

[0042] Example 2

[0043] In this embodiment, the TPU starry sky top film comprises the following layers stacked sequentially:

[0044] (1) A protective film layer with a thickness of 15 μm;

[0045] (2) A coating with a thickness of 4 μm;

[0046] (3) The first substrate layer has a thickness of 75 μm;

[0047] (4) The first mounting adhesive layer has a thickness of 5 μm;

[0048] (5) A starry sky pattern layer with a thickness of 0.3 μm;

[0049] (6) A second substrate layer with a thickness of 75 μm;

[0050] (7) The second mounting adhesive layer has a thickness of 5 μm;

[0051] (8) Release film layer with a thickness of 50 μm.

[0052] Example 3

[0053] In this embodiment, the TPU starry sky top film comprises the following layers stacked sequentially:

[0054] (1) A protective film layer with a thickness of 25 μm;

[0055] (2) A coating with a thickness of 5 μm;

[0056] (3) The first substrate layer has a thickness of 100 μm;

[0057] (4) The first mounting adhesive layer has a thickness of 15 μm;

[0058] (5) A star pattern layer with a thickness of 0.4 μm;

[0059] (6) A second substrate layer with a thickness of 100 μm;

[0060] (7) The second mounting adhesive layer has a thickness of 15 μm;

[0061] (8) Release film layer with a thickness of 60 μm.

[0062] Example 4

[0063] In this embodiment, the TPU starry sky top film comprises the following layers stacked sequentially:

[0064] (1) A protective film layer with a thickness of 36 μm;

[0065] (2) A coating with a thickness of 6 μm;

[0066] (3) The first substrate layer has a thickness of 150 μm;

[0067] (4) The first mounting adhesive layer has a thickness of 25 μm;

[0068] (5) A starry sky pattern layer with a thickness of 0.5 μm;

[0069] (6) A second substrate layer with a thickness of 250 μm;

[0070] (7) The second mounting adhesive layer has a thickness of 25 μm;

[0071] (8) Release film layer with a thickness of 75 μm.

[0072] Example 5

[0073] In this embodiment, the TPU starry sky top film comprises the following layers stacked sequentially:

[0074] (1) A protective film layer with a thickness of 100 μm;

[0075] (2) A coating with a thickness of 15 μm;

[0076] (3) The first substrate layer has a thickness of 200 μm;

[0077] (4) The first mounting adhesive layer has a thickness of 40 μm;

[0078] (5) A starry sky pattern layer with a thickness of 1 μm;

[0079] (6) A second substrate layer with a thickness of 300 μm;

[0080] (7) The second mounting adhesive layer has a thickness of 40 μm;

[0081] (8) Release film layer with a thickness of 100 μm.

[0082] The above description is merely an illustrative embodiment of this utility model and is not intended to limit the scope of this utility model. Any equivalent changes, modifications, and combinations made by those skilled in the art without departing from the concept and principles of this utility model should fall within the protection scope of this utility model.

Claims

1. A TPU starry sky roof film, characterized in that, Including the following layers stacked in sequence: (1) A protective film layer with a thickness of 2 to 188 μm; the material of the protective film layer is PET, PE or OPP; (2) A coating with a thickness of 2 to 30 μm; (3) A first substrate layer with a thickness of 50 to 500 μm; the material of the first substrate layer is TPU, TPH, PET or PP; (4) The first mounting adhesive layer has a thickness of 2 to 50 μm; (5) A star pattern layer with a thickness of 0.1–10 μm; (6) A second substrate layer with a thickness of 50 to 500 μm; the material of the second substrate layer is TPU, TPH, PET or PP; (7) The second mounting adhesive layer has a thickness of 2 to 50 μm; (8) Release film layer, the thickness of which is 5 to 188 μm; the material of the release film layer is PET, PE or OPP.

2. The TPU starry sky top film according to claim 1, characterized in that, The protective film is made of PET and has a thickness of 16–75 μm.

3. The TPU starry sky top film according to claim 1, characterized in that, The coating material is one of a highly cross-linked polymer coating or a thermosetting acrylate coating; the coating thickness is 2-8 μm.

4. The TPU starry sky top film according to claim 1, characterized in that, The material of the first substrate layer is TPU; the thickness of the first substrate layer is 150-200 μm.

5. The TPU starry sky top film according to claim 1, characterized in that, The function of the first mounting adhesive layer is to bond the first substrate layer and the starry sky pattern layer together. The material of the first mounting adhesive layer is an acrylic pressure-sensitive adhesive layer. The thickness of the first mounting adhesive layer is 20-30 μm.

6. The TPU starry sky roof film according to claim 1, characterized in that, The ink used in the starry sky pattern layer is a photosensitive ink used in screen printing machines, which serves a reflective function; the thickness of the starry sky pattern layer is 0.5–1 μm.

7. The TPU starry sky roof film according to claim 1, characterized in that, The material of the second substrate layer is TPU; the thickness of the second substrate layer is 200-300μm.

8. The TPU starry sky top film according to claim 1, characterized in that, The second mounting adhesive layer has a release film layer at its bottom. The function of the second mounting adhesive layer is to bond the second substrate layer and the release film layer together. The material of the second mounting adhesive layer is an acrylic pressure-sensitive adhesive layer. The thickness of the second mounting adhesive layer is 15-25 μm.

9. The TPU starry sky top film according to claim 1, characterized in that, The release film is made of PET and has a thickness of 23–75 μm.

Images