High-barrier laminated tpu car film and preparation method thereof

Abstract

The application provides a high-barrier laminated TPU car film and a preparation method thereof. The high-barrier laminated TPU car film comprises a first substrate layer, a second substrate layer, a double-silver magnetron layer and a third substrate layer which are stacked in sequence. The double-silver magnetron layer comprises a first high-refractive-index layer, a first metal oxide layer, a first silver layer, a first barrier layer, a second high-refractive-index layer, a second metal oxide layer, a second silver layer, a second barrier layer and a third high-refractive-index layer. The high-barrier laminated TPU car film has the advantages of thin thickness, transparent color, an infrared 1400 nm solar energy barrier rate of greater than or equal to 97%, an ultraviolet 365 nm solar energy barrier rate of greater than or equal to 99.5%, good flexibility and shrinkability, a simple preparation method, effective control of the firmness and oxidation resistance of the metal material sputtered on the surface of the substrate, and no influence on the appearance and heat insulation effect caused by arbitrary stretching or bending.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat insulation film, in particular to a high-barrier laminated TPU car film for cooling and heat insulation of the surface of a car body or a building body and a preparation method thereof. BACKGROUND

[0002] The film commonly known as window film, which is usually pasted on the car glass and the building glass, is used to provide heat insulation and ultraviolet protection. The traditional window film has limitations in terms of scratch resistance, acid rain resistance, surface oxidation resistance and bendability, so it cannot be pasted on the outside of the car and the outside of the building, and is limited to being pasted on the inside of the car glass and the building glass. With the development of new energy vehicles, many vehicle models have full-size glass canopies. The full-size glass canopy is usually a semi-transparent or transparent glass. When sunlight passes through the glass canopy, the temperature inside the car will continuously rise. In order to maintain a proper temperature inside the car during use, the power consumption and carbon emissions are greatly increased. Moreover, the glass canopy is often designed according to the shape of the car with a specific curvature. The double-silver heat insulation sunshade film on the market is made of PET. Before installation, the double-silver heat insulation sunshade film needs to be heated and baked to be shaped according to the curvature of the glass, but the deformation amount should not be too large. Since the car roof glass canopy with a specific curvature has a large curvature, the double-silver heat insulation sunshade film made of PET cannot be shaped into a large curvature or a large arc by heating and baking. Therefore, the conventional double-silver heat insulation sunshade film cannot be well installed and pasted on the large-curvature or large-arc car glass panoramic canopy without affecting the appearance. The nano heat insulation TPU car film commonly circulated on the market is made of organic or inorganic heat-absorbing barrier materials ground to microns and added to the pressure-sensitive adhesive in a certain proportion, and then installed on one side of the TPU by coating and rolling or scraping. Since the heat insulation material is a heat-absorbing material, it cannot effectively block the infrared rays in the sunlight when pasted on the outside of the car body or the car glass canopy. On the contrary, the nano heat insulation TPU car film absorbs a large amount of infrared rays on the surface, causing the temperature of the material itself to be too high. In particular, in areas with high outdoor temperatures, if the nano heat insulation TPU car film is installed on the outside of the car glass canopy, the canopy has the risk of bursting, thereby causing insufficient safety of the car. SUMMARY

[0003] In view of the above-mentioned deficiencies of the prior art, the present application provides a high-barrier laminated TPU car film and a preparation method thereof. The high-barrier laminated TPU car film can be used on the surface of a car or a building to play a role in heat insulation, cooling and energy saving in a sunlight exposure environment.

[0004] A high-barrier laminated TPU car film, comprising the following layers stacked in sequence:

[0005] (1) a first substrate layer having a thickness of 2-188 μm, preferably a thickness of 2-155 μm, further preferably a thickness of 2-100 μm, and the material of the first substrate layer being TPU (thermoplastic polyurethane elastomer), TPH (thermoplastic plastic elastomer), PET or PP; the TPU material is a thermoplastic polyurethane elastomer, which is a high polymer material formed by the copolymerization of diphenylmethane diisocyanate (MDI) or toluene diisocyanate (TDI) and a macromolecular polyol, a low-molecular polyol (chain extender); the TPU material has a wide hardness range, is resistant to wear and oil, is transparent and has good elasticity, and is widely used in the fields of daily necessities, sports goods, toys, decorative materials and the like; the main components of the TPU material include polyether ether ketone, polyester and isocyanate. The TPH material is also a thermoplastic elastomer, which is a high-strength, high-water-resistance and high-wear-resistance elastic material; it can withstand extreme temperature, pressure and chemical corrosion while maintaining good physical properties. The PET film is also known as high-temperature-resistant polyester film, and has excellent physical properties, chemical properties, dimensional stability, transparency and recyclability; it has excellent mechanical properties, and its toughness is the best among all thermoplastic plastics, and its tensile strength and impact strength are much higher than those of general films, and it has good stiffness, dimensional stability, excellent heat resistance, cold resistance, good chemical resistance and oil resistance. The PP film is divided into unstretched polypropylene film and biaxially oriented polypropylene film, and the unstretched polypropylene film includes blow-molded polypropylene film (IPP) produced by extrusion blow molding and extrusion cast polypropylene (CPP) produced by T-mold method; the biaxially oriented polypropylene film (BOPP) is a new type of film developed for the purpose of replacing glass paper, and has the characteristics of high mechanical strength, good toughness, good transparency and gloss. Preferably, the material of the first substrate layer is thermoplastic elastomer TPU or TPH, and more preferably, the material of the first substrate layer is TPU;

[0006] (2) a second substrate layer having a thickness of 2-188 μm, preferably a thickness of 2-155 μm, further preferably a thickness of 2-100 μm, and more further preferably a thickness of 2-16 μm, and the material of the second substrate layer being TPU, TPH, PET or PP, which has the same properties as the material of the first substrate layer; preferably, the material of the second substrate layer is PET (polyethylene terephthalate, i.e. high-temperature-resistant polyester film);

[0007] (3) a double-silver magnetron layer having a thickness of 94.4-315 nm (i.e. 0.094-0.315 μm); the double-silver magnetron layer is composed of the following layers stacked in sequence:

[0008] a first high-refractive-index layer having a thickness of 10-60 nm;

[0009] a first metal oxide layer having a thickness of 2-30 nm;

[0010] a first silver layer having a thickness of 5-20 nm;

[0011] a first barrier layer having a thickness of 0.2-10 nm;

[0012] a second high refractive index layer having a thickness of 50-75 nm;

[0013] a second metal oxide layer having a thickness of 2-30 nm;

[0014] a second silver layer having a thickness of 5-20 nm;

[0015] a second barrier layer having a thickness of 0.2-10 nm;

[0016] a third high refractive index layer having a thickness of 20-60 nm;

[0017] (4) a third substrate layer having a thickness of 2-188 μm, preferably a thickness of 2-155 μm, and further preferably a thickness of 2-100 μm; and the material of the third substrate layer is TPU (thermoplastic polyurethane elastomer) or TPH (thermoplastic plastic elastomer) or PET (polyethylene terephthalate) or PP; the material has the same properties as the first substrate layer, and preferably the material of the third substrate layer is TPU.

[0018] Further, the material of the first high refractive index layer, the second high refractive index layer and the third high refractive index layer is one or more of TiO2 (titanium dioxide), Ti3O5 (trititanium pentoxide), Ta2O5 (ditantalum pentoxide), Nb2O5 (dinibium pentoxide), SiN (silicon nitride);

[0019] Preferably, the material of the first high refractive index layer, the second high refractive index layer and the third high refractive index layer is Ti3O5, which has a refractive index of 2.2-2.5, a refractive index of 2.25 n-2.35 n at a wavelength of 550 nm, and a transparent region of 350-1100 nm.

[0020] Further, the material of the first metal oxide layer and the second metal oxide layer is one or more of AZO (zinc aluminum oxide, also known as aluminum-doped zinc oxide), ATO (tin antimony oxide, also known as antimony-doped tin dioxide), CTO (cesium tungsten oxide, also known as cesium-doped tungsten oxide), ITO (indium tin oxide, also known as indium tin oxide synthetic material), which has a refractive index of 1.95 n-2.05 n at a wavelength of 550 nm;

[0021] Preferably, the material of the first metal oxide layer and the second metal oxide layer is AZO (zinc aluminum oxide), which has a refractive index of 2.02.

[0022] Further, the material of the first barrier layer and the second barrier layer is nickel.

[0023] Further, the first substrate layer and the second substrate layer and the double silver magnetron layer and the third substrate layer are laminated by the mounting adhesive layer, the material of the mounting adhesive layer is acrylate pressure sensitive adhesive, the thickness of the mounting adhesive layer is 2-35 μm, preferably the thickness is 6-30 μm; further preferably the thickness is 10-30 μm; more preferably the thickness is 15-25 μm.

[0024] Further, the visible light band transmittance of the first substrate layer, the second substrate layer and the third substrate layer is ≥ 89%.

[0025] Further, a mounting pressure sensitive adhesive layer can also be coated on the other side of the third substrate layer, and a release film layer is attached, and when used, the release film layer is torn off, and then the high barrier laminated TPU car film is attached to the surface of the car or building.

[0026] The preparation method of the high barrier laminated TPU car film is implemented, comprising the following steps:

[0027] (1) A mounting adhesive is coated on one side of the first substrate layer by a coating process, and a second substrate layer is laminated; wherein the first substrate layer is a TPU film or a TPH film, preferably the first substrate layer is a TPU film; wherein the second substrate layer is a PET film;

[0028] (2) Ti3O5, AZO, silver, nickel, Ti3O5, AZO, silver, nickel, Ti3O5 are sputtered in sequence on the other side of the second substrate layer, i.e. a first high refractive index layer, a first metal oxide layer, a first silver layer, a first barrier layer, a second high refractive index layer, a second metal oxide layer, a second silver layer, a second barrier layer, a third high refractive index layer are formed, forming a double silver magnetron layer;

[0029] (3) A mounting adhesive is uniformly coated on one side of the third high refractive index layer, and a third substrate layer is attached, wherein the third substrate layer is a TPU film or a TPH film or a PET film, preferably the third substrate layer is a TPU film.

[0030] The high barrier laminated TPU car film can be used for heat insulation of the metal surface of the car and the glass surface or the surface of the building, and is attached to the metal roof of the car, the surface metal plate or the surface of the building, which can greatly improve the heat insulation performance of the car or the building, avoid the large amount of heat transfer from the sunlight to the inside of the car or the building, and solve the problem of attaching a double silver heat insulation film to the panoramic sunroof of the car.

[0031] The characteristics of the TPU or TPH base material are easy to stretch, large ductility, large shrinkage and can be arbitrarily bent. When the full TPU or TPH magnetic control double-silver heat insulation car cover film is prepared, the stretch ductility is not controlled in the effective range value, which can cause the damage of the double-silver magnetic control film. Based on the unique properties of the two kinds of base materials different from the PET base material, the super-thin PET base material and the TPU or TPH are laminated, which can effectively control the ductility of the high-barrier heat insulation car cover film and does not affect the properties thereof.

[0032] The high-barrier laminated TPU car film provided by the application has the advantages that the film has the effects of energy saving, cooling and heat insulation, is thin and transparent in color, can be arbitrarily attached to the position of the car roof and does not affect the color of the car itself, has the solar blocking rate of infrared rays of 950 nm of greater than or equal to 86%, the solar blocking rate of infrared rays of 1400 nm of greater than or equal to 97% and the solar blocking rate of ultraviolet rays of 365 nm of greater than or equal to 99.5%, and has the visible light transmittance of greater than or equal to 70% (measured by using a solar film tester LS182 model). Moreover, the film has good flexibility and shrinkage, and is not prone to wrinkling and bubble generation when attached to the car. The preparation method of the high-barrier laminated TPU car film provided by the application has the advantages of simple process flow, effective control of the firmness of the sputtered metal material on the surface of the PET base material and the oxidation resistance, and no influence of arbitrary stretching or bending on the appearance and heat insulation effect during preparation.

[0033] The high-barrier laminated TPU car film provided by the application has the advantages that the film has the effects of energy saving, cooling and heat insulation, is thin and transparent in color, can be arbitrarily attached to the position of the car roof and does not affect the color of the car itself, has the solar blocking rate of infrared rays of 950 nm of greater than or equal to 86%, the solar blocking rate of infrared rays of 1400 nm of greater than or equal to 97% and the solar blocking rate of ultraviolet rays of 365 nm of greater than or equal to 99.5%, and has the visible light transmittance of greater than or equal to 70% (measured by using a solar film tester LS182 model). Moreover, the film has good flexibility and shrinkage, and is not prone to wrinkling and bubble generation when attached to the car. The preparation method of the high-barrier laminated TPU car film provided by the application has the advantages of simple process flow, effective control of the firmness of the sputtered metal material on the surface of the PET base material and the oxidation resistance, and no influence of arbitrary stretching or bending on the appearance and heat insulation effect during preparation. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 The figure is a sectional view of the high-barrier laminated TPU car film in the embodiment of the application.

[0035] Figure 2 The figure is a comparison chart of the barrier data, transmittance data and weather resistance data of the high-barrier laminated TPU car film in the embodiment of the application and the ordinary car cover film.

[0036] Reference signs explanation: 1 - first substrate layer, 2 - second substrate layer, 3 - double silver magnetron layer, 4 - third substrate layer. DETAILED DESCRIPTION

[0037] In order to make the technical features, objectives and effects of the present application more clear, the specific embodiments of the present application will be described with reference to the drawings.

[0038] Example 1

[0039] The preparation steps of the high-barrier laminated TPU car film of the present application are described in detail as follows:

[0040] (1) Provide a flexible transparent TPU film as the first substrate layer 1

[0041] (2) Provide a flexible transparent PET film as the second substrate layer 2, which is stretched without deformation under the condition of 250-300N tension during the magnetron sputtering process, coated with pressure-sensitive adhesive on its surface, the thickness of the pressure-sensitive adhesive is 20μm, coated by roll coating method, dried by oven, the length of the seven ovens is 4 meters respectively, the total length of the oven is 28 meters, the temperature is set as follows: the first section 70℃, the second section 80℃, the third section 90℃, the fourth section 105℃, the fifth section 115℃, the sixth section 125℃, the seventh section 135℃, the baking time is 25 meters / minute, the temperature of the oven is sorted from low to high, which can avoid the problem of bubble generation and incomplete drying of the coating caused by the fact that the temperature is too high at the beginning to dry the surface of the coating and the solvent in the pressure-sensitive adhesive cannot be volatilized, and the dried and laminated film is on one side of the first substrate layer 1. Thus, the laminated film of TPU and PET is obtained as a plated film substrate to realize the double silver magnetron sputtering process requirement on the PET film (i.e. the second substrate layer 2).

[0042] (3) Deposit a double silver nine-layer process on the second substrate layer 2 by double-rotating cathode and intermediate frequency reactive magnetron sputtering. During the deposition of the magnetron sputtering plated film, the temperature in all chambers is constant, and the constant temperature range in all chambers is -15℃-20℃. The mixed gas of argon and oxygen with a volume ratio of 5:1-50:1 is introduced into the corresponding chamber, the sputtering vacuum degree is set to 10 -6 Torr, the stable gas pressure of the plated film is 10 -3 Torr; the double-rotating cathode and intermediate frequency reactive magnetron sputtering power is 10Kw-20Kw; the single-rotating cathode and direct current reactive magnetron sputtering power is 0.3Kw-2.5Kw. The optical film system is Ti3O5, AZO, silver, nickel, Ti3O5, AZO, silver, nickel, Ti3O5, the physical thickness of each layer is: 30nm / 15nm / 12nm / 1nm / 65nm / 15nm / 10nm / 1nm / 30nm, and a double silver magnetron film (i.e. a double silver magnetron layer 3) is obtained.

[0043] (4) The adhesive layer is coated on the double-silver magnetron layer 3 by a winding type coating and laminating line, and in the process, the stretching is not deformed under the condition of 250-300N tension, and then the pressure-sensitive adhesive is coated on the surface, and the coating is dried by an oven, the seven ovens are 4 meters long respectively, the total length of the oven is 28 meters, the temperature is set as: the first section 70℃, the second section 80℃, the third section 90℃, the fourth section 105℃, the fifth section 115℃, the sixth section 125℃, and the seventh section 135℃, the baking time is 25 meters / minute, and the temperature of the oven is sorted from low to high, so that the problem of bubbles and incomplete drying of the coating layer can be avoided, and the mirror surface rolling lamination is used to laminate the TPU third substrate layer 4 after the oven, so that the three-layer substrate lamination is obtained, and the metal material can be better and more effectively isolated from the air, the oxidation reaction is prevented, and the heat insulation durability of the cooling and heat insulation film is further ensured.

[0044] (5) The pressure-sensitive adhesive layer is coated on the other side of the third substrate layer 4 by a winding type coating and laminating line, and in the process, the stretching is not deformed under the condition of 250-300N tension, and then the pressure-sensitive adhesive is coated on the surface, and the coating is dried by an oven, the seven ovens are 4 meters long respectively, the total length of the oven is 28 meters, the temperature is set as: the first section 70℃, the second section 80℃, the third section 90℃, the fourth section 105℃, the fifth section 115℃, the sixth section 125℃, and the seventh section 135℃, the baking time is 25 meters / minute, and the temperature of the oven is sorted from low to high, so that the problem of bubbles and incomplete drying of the coating layer can be avoided, and the mirror surface rolling lamination is used to laminate a layer of release film layer after the oven, so that the high-barrier laminated TPU car film is obtained, and the release film layer is torn off when used, and then the high-barrier laminated TPU car film is attached to the surface of the car or building.

[0045] Figure 1 is a structural schematic diagram of the high-barrier laminated TPU car film prepared in the embodiment, and the high-barrier laminated TPU car film comprises the following layers which are stacked in turn:

[0046] (1) The first substrate layer has a thickness of 50μm;

[0047] (2) The second substrate layer has a thickness of 2μm;

[0048] (3) the double-silver magnetic control layer is composed of a first high refractive index layer, a first metal oxide layer, a first silver layer, a first barrier layer, a second high refractive index layer, a second metal oxide layer, a second silver layer, a second barrier layer, and a third high refractive index layer which are sequentially stacked, and the thicknesses are 30 nm / 15 nm / 12 nm / 1 nm / 65 nm / 15 nm / 10 nm / 1 nm / 30 nm, respectively;

[0049] (4) the third substrate layer has a thickness of 50 μm.

[0050] The high-barrier coated TPU car film was tested for visible ultraviolet barrier rate, visible light transmittance, infrared barrier rate, and other data, and the test results are shown in Table 1. Figure 2

[0051] The measurement data were measured by an LS182 solar film measuring instrument. First, the spectrometer was calibrated. The visible light band data of air were measured without medium, and the transmittance was 100%. Then, the high-barrier coated TPU car film with a size of 100 mm square was cut and placed in the measurement position for data measurement. The infrared solar barrier rate at 950 nm was ≥86%, the infrared solar barrier rate at 1400 nm was ≥97%, the ultraviolet solar barrier rate at 365 nm was ≥99.5%, and the visible light transmittance was ≥70%. The high-barrier coated TPU car film effectively controlled the extension length, enhanced the protection of the double-silver magnetic control layer, and reduced the risk of oxidation and functional failure of the magnetic control double-silver film layer caused by the breakage of the metal wire in the double-silver magnetic control layer during installation and use.

[0052] The high-barrier coated TPU car film product can be used on the surface of a car or a building, has the ability to prevent explosion and reflect ultraviolet and infrared heat, plays a role in heat insulation, cooling, and energy saving in a sunny environment, and has the effects of corrosion resistance, scratch resistance, aging resistance, and arc.

[0053] Example 2

[0054] According to the preparation method in Example 1, different film layer thicknesses were selected for preparation, and the prepared high-barrier coated TPU car film included the following layers which were sequentially stacked:

[0055] (1) the first substrate layer has a thickness of 2 μm;

[0056] (2) the second substrate layer has a thickness of 2 μm;

[0057] ​(3) the double-silver magnetic control layer is composed of a first high refractive index layer, a first metal oxide layer, a first silver layer, a first barrier layer, a second high refractive index layer, a second metal oxide layer, a second silver layer, a second barrier layer and a third high refractive index layer which are sequentially stacked, and the thicknesses are 10 nm / 2 nm / 5 nm / 0.2 nm / 50 nm / 2 nm / 5 nm / 0.2 nm / 20 nm, respectively;

[0058] (4) the third substrate layer has a thickness of 2 μm.

[0059] The high-barrier coated TPU car film is tested for visible ultraviolet blocking rate, visible light transmittance, infrared blocking rate and other data, and the test results show that the car film has the ability to reflect ultraviolet and infrared heat.

[0060] Example 3

[0061] According to the preparation method in Example 1, different film layer thicknesses are selected for preparation, and the prepared high-barrier coated TPU car film includes the following layers which are sequentially stacked:

[0062] (1) the first substrate layer has a thickness of 188 μm;

[0063] (2) the second substrate layer has a thickness of 188 μm;

[0064] (3) the double-silver magnetic control layer is composed of a first high refractive index layer, a first metal oxide layer, a first silver layer, a first barrier layer, a second high refractive index layer, a second metal oxide layer, a second silver layer, a second barrier layer and a third high refractive index layer which are sequentially stacked, and the thicknesses are 60 nm / 30 nm / 20 nm / 10 nm / 75 nm / 30 nm / 20 nm / 10 nm / 60 nm, respectively;

[0065] (4) the third substrate layer has a thickness of 188 μm.

[0066] The high-barrier coated TPU car film is tested for visible ultraviolet blocking rate, visible light transmittance, infrared blocking rate and other data, and the test results show that the car film has the ability to reflect ultraviolet and infrared heat.

[0067] The above merely illustrates the specific embodiments of the present application, and is not intended to limit the scope of the present application. Any equivalent changes, modifications and combinations made by those skilled in the art without departing from the concept and principle of the present application shall fall within the scope of the present application.

Claims

1. A high barrier lamination TPU car film, characterized in that, It comprises the following layers which are sequentially stacked: (1) a first substrate layer with a thickness of 50 μm, and the material of the first substrate layer is TPU; (2) a second substrate layer with a thickness of 2 μm, and the material of the second substrate layer is PET; (3) a double-silver magnetron layer, which is composed of Ti3O5 layer, AZO layer, silver layer, nickel layer, Ti3O5 layer, AZO layer, silver layer, nickel layer, Ti3O5 layer which are sequentially stacked, and the physical thickness of each layer is 30 nm, 15 nm, 12 nm, 1 nm, 65 nm, 15 nm, 10 nm, 1 nm, 30 nm, respectively; (4) a third substrate layer with a thickness of 50 μm; and the material of the third substrate layer is TPU; The preparation method of the high-barrier laminated TPU car film comprises the following steps: (1) providing a flexible transparent TPU film as the first substrate layer; (2) providing a flexible transparent PET film as the second substrate layer, stretching without deformation under the condition of 250-300 N tension in the magnetron sputtering process, coating pressure-sensitive adhesive on the surface, the thickness of the pressure-sensitive adhesive is 20 μm, coating by roller coating, drying through an oven, the lengths of the seven ovens are 4 meters respectively, the total length of the oven is 28 meters, the temperatures are set as 70℃ for the first oven, 80℃ for the second oven, 90℃ for the third oven, 105℃ for the fourth oven, 115℃ for the fifth oven, 125℃ for the sixth oven, and 135℃ for the seventh oven, the baking time is 25 meters / minute, the temperature of the oven is sorted from low to high, so that the problems of bubble generation and insufficient drying of the coating layer caused by the fact that the solvent in the pressure-sensitive adhesive cannot volatilize due to the high temperature at the beginning of the drying process of the coating surface can be avoided, and the TPU and PET laminated film is obtained after drying and laminating on one side of the first substrate layer, so as to be used as a plated film substrate to realize the double-silver magnetron sputtering process requirement on the PET film, i.e. the second substrate layer; (3) Ti3O5, AZO, silver, nickel, Ti3O5, AZO, silver, nickel, Ti3O5 are sputtered in sequence on the other side of the second substrate layer by means of double-rotating cathode and medium-frequency reactive magnetron sputtering, to form a double-silver magnetron layer, wherein, when the film is deposited by magnetron sputtering, the temperature in all the chambers is constant, and the constant temperature range in all the chambers is -15℃-20℃; the mixed gas of argon and oxygen with a volume ratio of 5:1-50:1 is introduced into the corresponding chamber, the sputtering vacuum degree is set to 10 -6 Torr, the stable gas pressure for film deposition is 10 -3 Torr; the double-rotating cathode and medium-frequency magnetron sputtering power is 10Kw-20Kw; (4) coating and installing the adhesive layer on the double-silver magnetron layer by the winding type coating and laminating line, stretching without deformation under the condition of 250-300 N tension, coating pressure-sensitive adhesive on the surface again, coating by roller coating, drying through an oven, the lengths of the seven ovens are 4 meters respectively, the total length of the oven is 28 meters, the temperatures are set as 70℃ for the first oven, 80℃ for the second oven, 90℃ for the third oven, 105℃ for the fourth oven, 115℃ for the fifth oven, 125℃ for the sixth oven, and 135℃ for the seventh oven, the baking time is 25 meters / minute, the temperature of the oven is sorted from low to high, so that the problems of bubble generation and insufficient drying of the coating layer caused by the fact that the solvent in the pressure-sensitive adhesive cannot volatilize due to the high temperature at the beginning of the drying process of the coating surface can be avoided, and the TPU third substrate layer is laminated by the mirror surface rolling lamination after drying out of the oven, so as to obtain a laminated substrate of three-layer substrate lamination, and the metal material can be better and more effectively isolated from air by lamination, so as to prevent oxidation reaction and further ensure the heat insulation durability of the cooling heat insulation car film. (5) The third substrate layer is coated with a pressure-sensitive adhesive layer on the other side by winding coating and bonding line, and stretched without deformation under the condition of 250-300N tension, and then coated with a pressure-sensitive adhesive on the surface, dried by roller coating through an oven, seven ovens with a length of 4 meters each, a total length of 28 meters, and temperatures set at 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 135℃ for the seventh section, with a baking time of 25 meters / minute, and the temperature of the oven is arranged from low to high, so that the problem of bubbles and incomplete drying of the coating layer caused by high temperature at the beginning of drying the surface of the coating layer and the solvent in the pressure-sensitive adhesive cannot be volatilized can be avoided, and a layer of release film is bonded by mirror surface rolling after drying out of the oven, so that a high-barrier coated TPU car film is obtained, which can be used by tearing off the release film layer and then bonding the high-barrier coated TPU car film on the surface of the car or building; The visible light band transmittance of the first substrate layer, the second substrate layer and the third substrate layer is ≥89%; the overcoating of the ultra-thin PET substrate and the TPU can effectively control the ductility of the high-barrier thermal car cover film and not affect its properties.

2. The method for preparing the high-barrier laminated TPU automotive film according to claim 1, characterized in that, The steps include: (1) providing a flexible transparent TPU film as the first substrate layer; (2) providing a flexible transparent PET film as the second substrate layer, stretching without deformation under the condition of 250-300N tension in the process of magnetron sputtering, coating a pressure-sensitive adhesive on the surface, the thickness of the pressure-sensitive adhesive being 20μm, drying by roller coating through an oven, seven ovens with a length of 4 meters each, a total length of 28 meters, and temperatures set at 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 135℃ for the seventh section, with a baking time of 25 meters / minute, and the temperature of the oven is arranged from low to high, so that the problem of bubbles and incomplete drying of the coating layer caused by high temperature at the beginning of drying the surface of the coating layer and the solvent in the pressure-sensitive adhesive cannot be volatilized can be avoided, and a layer of release film is bonded by mirror surface rolling after drying out of the oven, so that a high-barrier coated TPU car film is obtained, which can be used by tearing off the release film layer and then bonding the high-barrier coated TPU car film on the surface of the car or building; (3) Ti3O5, AZO, silver, nickel, Ti3O5, AZO, silver, nickel, Ti3O5 are sputtered in sequence on the other side of the second substrate layer by means of double-rotating cathode and medium-frequency reactive magnetron sputtering, to form a double-silver magnetron layer, wherein, when the film is deposited by magnetron sputtering, the temperature in all the chambers is constant, and the constant temperature range in all the chambers is -15℃-20℃; the mixed gas of argon and oxygen with a volume ratio of 5:1-50:1 is introduced into the corresponding chamber, the sputtering vacuum degree is set to 10 -6 Torr, the stable gas pressure for film deposition is 10 -3 Torr; the double-rotating cathode and medium-frequency magnetron sputtering power is 10Kw-20Kw; (4) The installation adhesive layer is coated on the double-silver magnetron layer by a winding type coating and bonding line, and the coating is stretched without deformation under the condition of a tension of 250-300 N during the process. Then, the surface is coated with pressure-sensitive adhesive by a roll coating method, and is dried by an oven. The seven ovens are 4 meters long respectively, and the total length of the ovens is 28 meters. The temperatures are set as follows: 70 DEG C for the first oven, 80 DEG C for the second oven, 90 DEG C for the third oven, 105 DEG C for the fourth oven, 115 DEG C for the fifth oven, 125 DEG C for the sixth oven, and 135 DEG C for the seventh oven. The baking time is 25 meters / minute, and the temperature of the oven is arranged from low to high, so that the coating surface is dried at the beginning, the solvent in the pressure-sensitive adhesive cannot volatilize, and the problems of bubble generation and insufficient drying of the coating do not occur. After the drying of the oven, the TPU third substrate layer is bonded by a mirror surface roll bonding method, so that the three-layer substrate bonding pair is obtained. The covering substrate is obtained by the covering method, which can better and more effectively isolate air from the metal material, prevent oxidation reaction, and further ensure the heat insulation durability of the cooling and heat insulation film. (5) The pressure-sensitive adhesive layer is coated on the other side of the third substrate layer by a winding type coating and bonding line, and the coating is stretched without deformation under the condition of a tension of 250-300 N during the process. Then, the surface is coated with pressure-sensitive adhesive by a roll coating method, and is dried by an oven. The seven ovens are 4 meters long respectively, and the total length of the ovens is 28 meters. The temperatures are set as follows: 70 DEG C for the first oven, 80 DEG C for the second oven, 90 DEG C for the third oven, 105 DEG C for the fourth oven, 115 DEG C for the fifth oven, 125 DEG C for the sixth oven, and 135 DEG C for the seventh oven. The baking time is 25 meters / minute, and the temperature of the oven is arranged from low to high, so that the coating surface is dried at the beginning, the solvent in the pressure-sensitive adhesive cannot volatilize, and the problems of bubble generation and insufficient drying of the coating do not occur. After the drying of the oven, a release film layer is bonded by a mirror surface roll bonding method, so that the high-barrier covering TPU car film is obtained. When used, the release film layer is torn off, and the high-barrier covering TPU car film is bonded to the surface of a car or a building.

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