Heat-insulating PET (Polyethylene Terephthalate) film

Abstract

The invention relates to the technical field of PET (polyethylene terephthalate), in particular to a heat-insulating PET film which comprises a base film layer made of PET, a mounting adhesive layer arranged at the bottom of the base film layer, a protective layer arranged at the bottom of the mounting adhesive layer to protect the mounting adhesive layer, a heat-insulating layer arranged on the base film layer to reduce the reflection effect of infrared rays and heat transfer, and a nano infrared absorbent adopted by the heat-insulating layer. The heat insulation layer is provided with the UV absorption layer, indoor temperature rise caused by ultraviolet rays is reduced, the UV absorption layer is provided with the reflection layer, the reflection layer is generated through polymerization reaction of TPEE and DMT, the new material has better emission performance, meanwhile, the defects of a metal reflection layer are avoided, and the reflection layer is further provided with the wear-resistant layer, so that external wear is reduced, the service life of the film is prolonged, and the service life of the film is prolonged. The PET film disclosed by the invention has the advantages of efficient heat insulation capability, longer service life, scratch resistance, good tensile strength and weather resistance.

Description

Technical Field

[0001] The invention relates to the technical field of PET films, in particular to a heat-insulating PET film. Background Art

[0002] PET films are the base layer for attaching other materials. Currently, thermal insulation PET films are usually metal coatings sputtered on PET films to form thermal insulation PET films with high thermal insulation. However, when the film material is subjected to external force, the metal coating is more likely to break and fall off. Although metal powder has high reflective ability, it is also more likely to cause a certain degree of light pollution.

[0003] Therefore, it is necessary to develop a more stable thermal insulation PET film material that is not easily damaged by stretching. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a heat-insulating PET film which can block reflected infrared rays and absorb ultraviolet rays, has good tensile properties and buffering capacity, and will not be easily damaged by external forces.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A heat-insulating PET film comprises a base film layer, wherein the base film layer is PET, a mounting adhesive layer is arranged at the bottom of the base film layer, a protective layer is arranged at the bottom of the mounting adhesive layer to protect the mounting adhesive layer, a heat-insulating layer is arranged on the base film layer to reduce the reflection effect of infrared rays and reduce the transfer of heat, the heat-insulating layer adopts a nano infrared absorber, a UV absorbing layer is arranged on the heat-insulating layer to reduce the indoor temperature rise caused by ultraviolet rays, a reflective layer is arranged on the UV absorbing layer, the reflective layer is generated by mixing TPEE and nano ceramic particles, and a wear-resistant layer is also arranged on the reflective layer to reduce external wear.

[0006] Optionally, in one embodiment of the present invention, the thickness of the base film layer is 25 μm-150 μm to cope with different usage scenarios.

[0007] Optionally, in one embodiment of the present invention, the heat insulation layer is formed by mixing nano infrared absorber, diluent and glue, and the thickness of the heat insulation layer is 8 μm-120 μm.

[0008] Optionally, in an embodiment of the present invention, the UV absorption layer is specifically prepared by mixing a UV absorber, a polyester acrylic resin, a diluent and glue.

[0009] Optionally, in one embodiment of the present invention, the UV absorber is an organic UV absorber.

[0010] Optionally, in one embodiment of the present invention, the wear-resistant layer is a polyurethane coating.

[0011] Optionally, in one embodiment of the present invention, the nano-ceramic particles are 0.5%-3% of TPEE.

[0012] Beneficial effects of the present invention The heat-insulating PET film of the present invention is provided with a heat-insulating layer to block infrared rays, a UV absorbing layer is provided on the heat-insulating layer to block ultraviolet radiation, a reflecting layer is provided on the UV absorbing layer, and the reflecting layer is a mixed material of PEE and nano-ceramic particles, which has high elasticity and good tensile properties, can buffer external impact force and provide certain reflection ability, and a wear-resistant layer is also provided on the reflecting layer to protect the internal structure and reduce scratches. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0014] Figure 1 This is a schematic diagram of a heat-insulating PET film according to Example 1 of the present invention; Reference numerals: base film layer 1 , heat insulation layer 2 , UV absorption layer 3 , reflection layer 4 , wear-resistant layer 5 , mounting adhesive layer 6 , protective layer 7 . DETAILED DESCRIPTION

[0015] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0016] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0017] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0018] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0020] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0021] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments. Example 1

[0022] In order to improve the use stability of the thermal insulation PET film, a thermal insulation PET film was developed. The specific solution is as follows: like Figure 1As shown, a heat-insulating PET film includes a base film layer 1, the base film layer 1 is PET, the PET material has good mechanical properties, provides stable support for other functional layers, and ensures the overall durability and processability of the film, a mounting adhesive layer 6 is provided at the bottom of the base film layer 1, and a protective layer 7 is provided at the bottom of the mounting adhesive layer 6 to protect the mounting adhesive layer 6. When in use, the protective layer 7 needs to be removed, and the protective layer 7 is used to maintain the viscosity of the mounting adhesive layer 6. A heat-insulating layer 2 is provided on the base film layer 1 to reduce the reflection of infrared rays and reduce heat transfer. The heat-insulating layer 2 adopts a nano-infrared absorber, and a UV absorbing layer 3 is provided on the heat-insulating layer 2 to reduce the indoor temperature rise caused by ultraviolet rays. A reflective layer 4 is provided on the UV absorbing layer 3, and the reflective layer 4 is generated by mixing TPEE and nano-ceramic particles. A wear-resistant layer 5 is also provided on the reflective layer 4 to reduce external wear.

[0023] The thickness of the base film layer 1 is 25μm-150μm to cope with different usage scenarios. For example, when used on car windows, the thickness of the base film layer 1 can be 25μm. When used on the surface of household appliances, the thickness of the base film layer 1 is 50μm-100μm. When used in higher-intensity application scenarios, such as outdoor billboards, the thickness of the base film layer 1 exceeds 100μm.

[0024] The heat insulation layer 2 is specifically prepared by mixing nano infrared absorbers, diluents and glue. The thickness of the heat insulation layer 2 is 8μm-120μm. In this embodiment, the nano infrared absorber is G-P28-MIBK nano infrared absorber, which maintains high transparency in the visible light range and can effectively absorb infrared rays. Its visible light transmittance can reach more than 70%, and its infrared blocking rate is as high as more than 99%, with excellent heat insulation performance.

[0025] The UV absorbing layer 3 is specifically prepared by mixing a UV absorber, polyester acrylic resin, a diluent and glue. The polyester acrylic resin has good film-forming properties and adhesion. The diluent is a lipid diluent, which is well compatible with the polyester acrylic resin and will not affect the quality and performance of the solution.

[0026] The UV absorber is an organic UV absorber. The organic UV absorber can be benzotriazole or benzophenone, which has high absorption efficiency and a wide absorption spectrum range, and can be well compatible with polyester acrylic resin to form a stable coating solution. The coating has excellent weather resistance and light resistance, which can ensure the service life of the film.

[0027] The wear-resistant layer 5 is a polyurethane coating. Facing a relatively harsh use environment, the polyurethane coating can protect the internal structure of the film and reduce the occurrence of scratches on the surface.

[0028] The nano-ceramic particles are 0.5%-3% of TPEE. According to the required reflective ability of the reflective layer 4, the added amount of nano-ceramic particles is adjusted within the range of 0.5%-3%. TPEE itself has good weather resistance and aging resistance. Adding aluminum oxide or titanium oxide to TPEE can ensure the mechanical properties of the reflective layer 4 and improve the reflectivity of the reflective layer 4. The thickness of the reflective layer 4 is between 0.2mm and 0.3mm.

[0029] The heat-insulating PET film of the present invention is provided with a heat-insulating layer 2, a UV-absorbing layer 3, and a reflective layer 4. The three-layer structure can ensure that the PET film can block infrared and ultraviolet rays and has high heat-insulating efficiency. The reflective layer 4 is not a metal-plated layer using traditional technology, which avoids the problems that may arise when using the metal-plated layer. The emission layer is made of TPEE material, which has better elasticity and tensile properties and can buffer the film when the film is subjected to external force. Nano-ceramic powder is added to the TPEE material to make the reflective layer 4 have good reflective properties, further improving the heat-insulating ability of the film material. At the same time, the mechanical properties of the film material itself are better. A wear-resistant layer 5 is provided on the outermost layer of the film material to protect the inside of the film material and make it more wear-resistant.

[0030] The directions or positional relationships indicated by terms such as “center”, “longitudinal”, “lateral”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the protection content of the present invention.

[0031] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Although the present invention has been disclosed as above in the form of preferred embodiments, it is not intended to limit the present invention. Any technical personnel in the field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A thermal insulation PET film, characterized in that: It includes a base film layer, which is PET. A mounting adhesive layer is provided at the bottom of the base film layer. A protective layer is provided at the bottom of the mounting adhesive layer to protect the mounting adhesive layer. A heat insulation layer is provided on the base film layer to reduce the reflection of infrared rays and reduce the transfer of heat. The heat insulation layer adopts a nano infrared absorber. A UV absorption layer is provided on the heat insulation layer to reduce the indoor temperature rise caused by ultraviolet rays. A reflective layer is provided on the UV absorption layer. The reflective layer is generated by mixing TPEE and nano ceramic particles. A wear-resistant layer is also provided on the reflective layer to reduce external wear.

2. The thermal insulation PET film according to claim 1, characterized in that: The thickness of the base film layer is 25 μm-150 μm to cope with different usage scenarios.

3. The thermal insulation PET film according to claim 1, characterized in that: The heat insulation layer is specifically formed by mixing nano infrared absorber, diluent and glue, and the thickness of the heat insulation layer is 8 μm-120 μm.

4. The thermal insulation PET film according to claim 1, characterized in that: The UV absorbing layer is specifically prepared by mixing a UV absorber, a polyester acrylic resin, a diluent and glue.

5. The thermal insulation PET film according to claim 4, characterized in that: The UV absorber is an organic UV absorber.

6. The thermal insulation PET film according to claim 1, characterized in that: The wear-resistant layer is a polyurethane coating.

7. The thermal insulation PET film according to claim 1, characterized in that: The nano ceramic particles account for 0.5%-3% of TPEE.

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