Laminated reflective film and reflective heat-insulating film thereof

Abstract

The utility model relates to the technical field of glass films, in particular to a reflective film and a reflective heat-insulating film thereof, and the specific method is as follows: the laminated reflective film is a resin laminated layer formed by overlapping different resins; the resin overlapping layer comprises a resin A layer and a resin B layer, and the number of the resin overlapping layers is 100-300; according to the adjustment of the thickness of the resin A layer and the thickness of the resin B layer, interference reaction is generated, and light rays with different wavelengths in sunlight are reflected; the thickness of the laminated reflecting film is 10 to 200 [mu] m; according to the reflective heat-insulating film provided by the utility model, the combination of the reflective film base material and the nano heat-insulating agent is added; meanwhile, the performance of reflecting infrared light is achieved through the reflecting film which is arranged in a stacked mode, and the electromagnetic communication wave band is not blocked; the composite film is suitable for building window films and also suitable for window glass of current popular intelligent automobiles, heat insulation and energy saving are achieved, and meanwhile, influence or shielding signals are completely avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of glass films, in particular to a laminated reflective film and a reflective heat-insulating film thereof. Background Art

[0002] With the gradual maturity of the domestic new energy vehicle market and industrial chain in recent years, the pace of moving towards brand high-end has gradually accelerated, and more and more models with product competitiveness have been launched. The window films supporting them have also emerged as the times require. However, the heat-insulating effect of automotive window films is basically achieved by doping metals in the film layer, but doping metals often has the disadvantage of signal shielding.

[0003] Secondly, the development of high-functional building glass window film products is also relatively rapid, especially those mainly focusing on energy conservation, safety, environmental protection, etc. New requirements are constantly being put forward for the comprehensive application performance of building glass window film products. How to design a glass film with good heat preservation and heat insulation effects and good mechanical properties is crucial. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a laminated reflective film and a reflective heat-insulating film thereof, which adds the combination of a reflective film substrate and a nano heat-insulating agent; at the same time, on the premise of no metal materials, through the laminated reflective film configured in layers, the performance of infrared light reflection can be freely controlled by using the thickness control and lamination technology generated by the overlap of different resins to control the reflection and transmission wavelengths; it is suitable for both building window films and the current popular intelligent vehicles, and there is no metal material in the structure, completely avoiding the existence of metal substances that can affect or shield signals.

[0005] The above technical purpose of the utility model is achieved through the following technical solutions:

[0006] A laminated reflective film provided by the utility model is a resin overlapping layer formed by overlapping different resins;

[0007] The resin overlapping layer includes a resin A layer and a resin B layer,

[0008] The number of layers of the resin overlapping layer is 100 - 300 layers;

[0009] According to the adjustment of the thickness of the resin A layer and the thickness of the resin B layer, an interference reaction is generated to reflect light of different wavelengths in sunlight;

[0010] The thickness of the resin A layer and the thickness of the resin B layer are determined by the following formula:

[0011]

[0012] Among them, h1 and h2 are the thicknesses of the resin A layer and the resin B layer respectively, with the unit of nm;

[0013] γ1 and γ2 are the refractive indices of the resin A layer and the resin B layer respectively;

[0014] a is an adjustment coefficient, with the unit of 1;

[0015] The thickness of the laminated reflective film is 10 - 200 μm.

[0016] Furthermore, the thickness of the resin A layer is 90 - 100 nm.

[0017] Furthermore, the a is determined according to the infrared wavelength to be reflected;

[0018] The resin A contains polyethylene terephthalate or polyethylene naphthalate; the resin B is a naphthenic acid copolyester;

[0019] The refractive index of the resin A layer is 1.655 - 1.70, and the refractive index of the resin B layer is 1.68 - 1.72.

[0020] Furthermore, the reflective heat insulation film sequentially includes: an abrasion-resistant layer, a laminated reflective film, a functional layer, an ultraviolet barrier pressure-sensitive adhesive layer, and a release film;

[0021] Among them, the functional layer is 0 - 5 layers;

[0022] Among them, the functional layer includes a nano heat insulation layer and a base film.

[0023] Furthermore, the base film is a transparent polyester film or a laminated reflective film.

[0024] Furthermore, the total thickness of the reflective heat insulation film is 53 - 556 μm.

[0025] Furthermore, the thickness of the laminated reflective film is 12 - 188 μm.

[0026] Furthermore, the thickness of the nano heat insulation layer is 3 - 30 μm.

[0027] Furthermore, the nano heat insulation layer includes the following components: an adhesive, a curing agent, a heat insulation material, a solvent, and an ultraviolet barrier agent.

[0028] The present utility model also provides a preparation method of a reflective heat insulation film, including the following steps:

[0029] On one surface of the laminated reflective film, a mixed material for forming an abrasion-resistant layer is coated, dried at a temperature of 70 - 130 °C, and then cured by ultraviolet light to obtain the abrasion-resistant layer;

[0030] Coat the mixture of the ultraviolet barrier pressure-sensitive adhesive layer on the other surface of the laminated reflective film, and cure it at a temperature of 90-150 °C for 40-120 seconds to obtain the ultraviolet barrier pressure-sensitive adhesive layer;

[0031] Compound the surface of the base film of the functional layer on the side of the ultraviolet barrier pressure-sensitive adhesive layer away from the laminated reflective film;

[0032] Compound the release film on the surface of the nano-insulating layer of the functional layer to obtain a reflective heat-insulating film with all layers compounded into one.

[0033] In summary, the present utility model has the following beneficial effects:

[0034] The reflective heat-insulating film provided by the present utility model has a composite structure, and each layer has a synergistic effect; it enables the film to achieve a high visible light transmittance, a high near-infrared reflectance, and the effect of not shielding communication signals, and can not only reflect the heat radiated by the sun through the glass in summer, but also block the energy loss through heat radiation and heat conduction in winter heating, achieving the purpose of energy conservation and consumption reduction; in addition, the preparation method of the heat-insulating film of the present utility model is simple and easy to operate, the combination between layers is firm, and it is very convenient to use. When in use, after peeling off the outermost release film, it can be directly pasted to the position where the film needs to be pasted. Description of the Drawings

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0036] Figure 1 It is a schematic structural diagram of the reflective heat-insulating film provided by the present utility model;

[0037] Figure 2 [[ID=2,5]]It is a schematic structural diagram of the resin overlapping layer in Embodiment 1;

[0038] Figure 3 It is a schematic structural diagram of the resin overlapping layer in Embodiment 2;

[0039] Figure 4 It is a schematic structural diagram of the resin overlapping layer in Embodiment 3

[0040] Figure 5 It is a schematic diagram of the arrangement of the protruding parts in the resin overlapping layer in Embodiment 3.

[0041] Reference numerals: wear-resistant layer 1, laminated reflective film 2-1, nano-insulating layer 3, base film 2-2, ultraviolet barrier pressure-sensitive adhesive layer 4, release film 5, resin A layer 6, protruding part 61, resin B layer 7. Detailed implementation manners

[0042] To further illustrate the technical means and effects adopted by the present utility model to achieve the predetermined utility model purpose, a laminated reflective film, its reflective heat insulation film and preparation method according to the present utility model are described in detail below in terms of its specific implementation manners, features and effects.

[0043] This specific implementation manner provides a laminated reflective film, which is characterized in that the laminated reflective film is a resin overlapping layer formed by overlapping different resins;

[0044] The resin overlapping layer includes a resin A layer and a resin B layer.

[0045] The number of layers of the resin overlapping layer is 100 - 300 layers;

[0046] By adjusting the thickness of the resin A layer and the thickness of the resin B layer, an interference reaction is generated to reflect light rays of different wavelengths in sunlight;

[0047] The thickness of the resin A layer and the thickness of the resin B layer are determined by the following formula:

[0048]

[0049] where h1 and h2 are the thicknesses of the resin A layer and the resin B layer respectively, and the unit is nm;

[0050] γ1 and γ2 are the refractive indices of the resin A layer and the resin B layer respectively;

[0051] a is an adjustment coefficient, and the unit is 1;

[0052] The thickness of the laminated reflective film is 10 - 200 μm.

[0053] In some preferred embodiments, the thickness of the resin A layer is 90 - 100 nm.

[0054] In some preferred embodiments, a is determined according to the reflected infrared wavelength;

[0055] The resin A contains polyethylene terephthalate or polyethylene naphthalate; the resin B is a naphthenic acid copolyester;

[0056] The refractive index of the resin A layer is 1.655 - 1.70, and the refractive index of the resin B layer is 1.68 - 1.72.

[0057] It can be understood that in this specific embodiment, by alternately stacking different resin A and resin B layers, adjusting their thicknesses h1 and h2, and utilizing the interference effect, this reflective film can effectively reflect light of different wavelengths in sunlight. This means that it can reflect light in a wide spectral range, including visible light, infrared light, and even part of ultraviolet light.

[0058] According to the thin-film interference principle, when the optical path difference of different layers satisfies the interference condition, the reflected light waves will undergo phase superposition, thereby enhancing the reflectivity. In this specific embodiment, by adjusting the thicknesses of resin A and resin B layers, strong interference effects of light of different wavelengths are generated in the film layer, achieving higher reflection efficiency.

[0059] The adjustment coefficient a in the formula can adjust the film layer according to specific optical requirements. By changing a, the optical performance of the reflective film can be flexibly controlled, and the reflection ratio of light in different bands can be precisely adjusted. This flexibility enables the reflective film to be optimized according to different application scenarios to meet specific requirements. For example: If high-efficiency reflection is required in a certain specific band (such as infrared or ultraviolet light), a can be precisely fitted according to the relationship between wavelength and refractive index. If reflection of certain specific spectral bands (such as visible light in sunlight) is required, the reflection performance can be customized by adjusting a and the number of film layers.

[0060] This specific embodiment also provides a reflective heat-insulating film including a reflective film, which sequentially includes: an abrasion-resistant layer, a reflective film, a functional layer, an ultraviolet-blocking pressure-sensitive adhesive layer, and a release film;

[0061] Among them, the number of functional layers is 0 to 5 layers;

[0062] Among them, the functional layer includes a nano heat-insulating layer and a base film.

[0063] It can be understood that the interference principle of the resin overlapping layer involves the thin-film interference phenomenon of light. Thin-film interference is caused by the superposition of light waves reflected and transmitted at the interfaces of two or more different media. The overlapping of resin A layer and resin B layer forms a multi-layer structure. Different layers of resin have different refractive indices and thicknesses, and these differences will cause light waves to be reflected and transmitted at these interfaces, achieving complete reflection of light of all wavelengths (i.e., white light reflection).

[0064] To achieve total reflection of light of all wavelengths, it is necessary for light of each wavelength to satisfy the condition of enhanced interference in the resin overlapping layer. This generally requires precise adjustment of the thickness and refractive index of each layer of resin so that for each wavelength, the reflected light coherently superposes in this multi-layer structure to form enhanced interference. In this specific embodiment, by precisely designing the thickness of resin A and resin B layers, it is possible to make all incident light waves satisfy the same coherent condition when reflecting at the interface of this multi-layer structure, thereby achieving reflection of light of all wavelengths. The relative average reflectance of wavelengths from 400 to 700 nm is above 70%, and the reflectance of the positive reflection component is above 10% of the relative average reflectance of the wavelengths from 400 to 700 nm.

[0065] In some preferred embodiments, the base film is a transparent or opaque polyester film, polyurethane film, polycarbonate film, or laminated reflective film.

[0066] In some preferred embodiments, the total thickness of the reflective heat-insulating film is 53 - 556 μm.

[0067] In some preferred embodiments, the thickness of the laminated reflective film is 12 - 188 μm.

[0068] In some preferred embodiments, the thickness of the nano heat-insulating layer is 3 - 30 μm.

[0069] In some preferred embodiments, the thickness of the UV-blocking pressure-sensitive adhesive layer is 3 - 30 μm.

[0070] In some preferred embodiments, the thickness of the release film is 16 - 100 μm.

[0071] In some preferred embodiments, the thickness of the wear-resistant layer is 0.5 - 1 μm.

[0072] In some preferred embodiments, the thickness of the UV-blocking pressure-sensitive adhesive layer is 3 - 50 μm.

[0073] In some preferred embodiments, there are raised portions provided on the resin A layer, and the raised portions are arranged in a dot matrix pattern.

[0074] In this specific embodiment, the raised portions are arranged in a dot matrix pattern, which will introduce an additional optical path difference when light is incident, causing the incident light to diffract, making light waves in different directions interfere with each other, and improving the total reflectance of light.

[0075] In some preferred embodiments, the height of the raised portions is 2 - 5 nm, and the bottom area of the raised portions is 4 - 8 nm 2 。

[0076] It is understandable that the local thickness change caused by the protrusions changes the optical path difference in these local areas. With the above settings of height and bottom area, interference enhancement of light with a specific wavelength, such as infrared wavelength, can be achieved in these areas, thereby increasing the reflectivity of infrared light.

[0077] In some preferred embodiments, the nano heat insulation layer comprises the following components: an adhesive, a curing agent, a heat insulation material, a solvent, and an ultraviolet barrier agent;

[0078] Among them, the adhesive is an acrylic adhesive or a polyurethane adhesive;

[0079] The curing agent is melamine or isocyanate;

[0080] The solvent is ethyl acetate, toluene, or ketones;

[0081] The ultraviolet barrier agent can be benzotriazoles, benzophenones, or triazines.

[0082] A method for preparing a reflective heat insulation film provided by this specific embodiment includes the following steps:

[0083] Coat a mixed material for forming a wear-resistant layer on one surface of the laminated reflective film, and dry it at a temperature of 70 - 130 °C and cure it by ultraviolet light to obtain a wear-resistant layer;

[0084] Coat a mixed material for an ultraviolet barrier pressure-sensitive adhesive layer on the other surface of the laminated reflective film, and cure it at a temperature of 90 - 150 °C for 40 - 120 seconds to obtain an ultraviolet barrier pressure-sensitive adhesive layer;

[0085] Compound the surface of the base film of the functional layer on the side of the ultraviolet barrier pressure-sensitive adhesive layer away from the laminated reflective film;

[0086] Compound a release film on the surface of the nano heat insulation layer of the functional layer to obtain a reflective heat insulation film with all layers compounded together.

[0087] Example 1

[0088] As Figure 1 shown, this embodiment provides a reflective heat insulation film, which sequentially includes: a wear-resistant layer 1, a laminated reflective film 2-1, a nano heat insulation layer 3, a base film 2-2, an ultraviolet barrier pressure-sensitive adhesive layer 4, and a release film 5.

[0089] Among them, the thickness of the wear-resistant layer 1 is 0.5 μm, and the preparation method of its mixed material is as follows:

[0090] Prepare a scratch-resistant agent and ethyl acetate as the solvent according to a mass ratio of 1:1.05, mix the two evenly to obtain the mixed material for forming the wear-resistant layer 1, store it for later use, its appearance is a colorless transparent liquid, and the solid content is 46 wt%.

[0091] The thickness of the laminated reflective film 2-1 is 23 μm, and the material is a transparent polyester film.

[0092] The thickness of the nano heat insulation layer 3 is 5 μm. Calculated by mass percentage, the preparation method of its mixed material is as follows:

[0093] Add 6.23% of nano tungsten oxide into toluene, mix and stir for 30 minutes, add 56.68% of acrylate adhesive, stir for 25 minutes, add 0.85% of curing agent, stir for 5 - 15 minutes, measure its viscosity at 150 centipoises to obtain the mixed material.

[0094] The thickness of the base film 2-2 is 50 μm, and the material is a transparent polyester film.

[0095] The thickness of the UV-blocking pressure-sensitive adhesive layer 4 is 10 μm. The preparation method of its mixed material is as follows:

[0096] Prepare each component according to the mass ratio of acrylate adhesive:curing agent:toluene of 30:1.5:20. At an ambient temperature of 20°C, first mix and stir toluene and acrylate adhesive for 20 minutes, then add the curing agent and stir for 10 minutes, and measure the viscosity with a rotary viscometer to be 120 centipoises.

[0097] Resin A is polyethylene terephthalate; Resin B is naphthenic acid copolyester;

[0098] The refractive index of the Resin A layer is 1.655, and the refractive index of the Resin B layer is 1.68.

[0099] Based on the above materials, this embodiment provides a preparation method of a reflective heat insulation film, including the following steps:

[0100] On one surface of the laminated reflective film, coat and form the mixed material of the wear-resistant layer, dry at a temperature of 70 - 130°C and cure by ultraviolet light to obtain the wear-resistant layer;

[0101] On the other surface of the laminated reflective film, coat the mixed material of the UV-blocking pressure-sensitive adhesive layer, and cure at a temperature of 150°C after placing for 120 seconds to obtain the UV-blocking pressure-sensitive adhesive layer;

[0102] Compound the surface of the base film of the functional layer on the side of the UV-blocking pressure-sensitive adhesive layer away from the laminated reflective film;

[0103] Compound a release film on the surface of the nano heat insulation adhesive layer of the functional layer to obtain a reflective heat insulation film with all layers compounded together.

[0104] As Figure 2As shown, in this embodiment, the resin overlapping layer is formed by overlapping and laying the resin A layer 6 and the resin B layer 7 layer by layer. Among them, the thickness of the resin A layer 6 is 100 nm, and the thickness of the resin B layer 7, calculated according to the formula provided by the present utility model, is 120 nm.

[0105] Example 2

[0106] As Figure 1 shown, this embodiment provides a reflective heat insulation film, which successively includes: a wear-resistant layer 1, a laminated reflective film 2-1, a nano heat insulation layer 3, a base film 2-2, an ultraviolet barrier pressure-sensitive adhesive layer 4, and a release film 5.

[0107] Among them, the thickness of the wear-resistant layer 1 is 0.8 μm, and the preparation method of its mixed material is as follows:

[0108] Prepare a scratch-resistant agent and ethyl acetate as a solvent according to a mass ratio of 1:1.05, mix the two evenly to obtain the mixed material for forming the wear-resistant layer 1, store it for later use. Its appearance is a colorless transparent liquid, and the solid content is 50 wt%.

[0109] The thickness of the laminated reflective film 2-1 is 23 μm, and the material is a transparent polyester film.

[0110] The thickness of the nano heat insulation layer 3 is 15 μm. Calculated by mass percentage, the preparation method of its mixed material is as follows:

[0111] Add 6.23% of nano tungsten oxide to toluene, mix and stir for 30 minutes, add 56.68% of acrylate adhesive, stir for 25 minutes, add 0.85% of curing agent, stir for 5 - 15 minutes, and measure its viscosity at 150 centipoise to obtain the mixed material.

[0112] The thickness of the base film 2-2 is 50 μm, and the material is a transparent polyester film.

[0113] Resin A is polyethylene terephthalate; Resin B is naphthenic acid copolyester;

[0114] The refractive index of the resin A layer is 1.655, and the refractive index of the resin B layer is 1.68.

[0115] The thickness of the ultraviolet barrier pressure-sensitive adhesive layer 4 is 15 μm, and the preparation method of its mixed material is as follows:

[0116] Prepare each component according to the mass ratio of acrylate adhesive:curing agent:toluene of 30:1.5:20. At an ambient temperature of 20°C, first mix and stir toluene and acrylate adhesive for 20 minutes, then add the curing agent and stir for 10 minutes, and measure the viscosity with a rotational viscometer to be 200 centipoise.

[0117] Based on the above materials, this embodiment provides a method for preparing a reflective heat-insulating film, which includes the following steps:

[0118] On one surface of the laminated reflective film, a mixed material for forming an abrasion-resistant layer is coated, and after drying at a temperature of 70-130 °C and being cured by ultraviolet light, an abrasion-resistant layer is obtained;

[0119] On the other surface of the laminated reflective film, a mixed material for an ultraviolet-blocking pressure-sensitive adhesive layer is coated, and after being placed at a temperature of 150 °C for 120 seconds and cured, an ultraviolet-blocking pressure-sensitive adhesive layer is obtained;

[0120] The surface of the base film of the functional layer is laminated on the side of the ultraviolet-blocking pressure-sensitive adhesive layer away from the laminated reflective film;

[0121] An anti-sticking film is laminated on the surface of the nano heat-insulating layer of the functional layer to obtain a reflective heat-insulating film with all layers laminated together.

[0122] As Figure 3 shown, in this embodiment, the resin overlapping layer is formed by laminating resin layer A 6 and resin layer B 7 layer by layer. Among them, the thickness of resin layer A 6 is 100 nm, and the thickness of resin layer B 7, calculated according to the formula provided by the present utility model, is 110 nm.

[0123] Example 3

[0124] As Figure 1 shown, this embodiment provides a reflective heat-insulating film, which sequentially includes: an abrasion-resistant layer 1, a laminated reflective film 2-1, a nano heat-insulating layer 3, a base film 2-2, an ultraviolet-blocking pressure-sensitive adhesive layer 4, and an anti-sticking film 5.

[0125] Among them, the thickness of the abrasion-resistant layer 1 is 1 μm, and the preparation method of its mixed material is as follows:

[0126] Prepare a scratch-resistant agent and ethyl acetate as a solvent according to a mass ratio of 1:1.05, mix the two evenly to obtain the mixed material for forming the abrasion-resistant layer 1, store it for later use, its appearance is a colorless transparent liquid, and the solid content is 46 wt%.

[0127] The thickness of the laminated reflective film 2-1 is 23 μm, and the material is a transparent polyester film.

[0128] The thickness of the nano heat-insulating layer 3 is 20 μm. Calculated according to mass percentage, the preparation method of its mixed material is as follows:

[0129] Add 6.23% of nano tungsten oxide into toluene, mix and stir for 30 minutes, add 56.68% of acrylate adhesive, stir for 15 minutes, add 0.85% of curing agent, stir for 15 minutes, and measure its viscosity at 150 centipoise to obtain the mixed material.

[0130] The thickness of the base film 2-2 is 50 μm, and the material is a transparent polyester film.

[0131] Resin A is polyethylene terephthalate; Resin B is a naphthenic acid copolyester;

[0132] The refractive index of the Resin A layer is 1.655, and the refractive index of the Resin B layer is 1.68.

[0133] The thickness of the ultraviolet barrier pressure-sensitive adhesive layer 4 is 15 μm, and the preparation method of its mixed material is as follows:

[0134] Prepare each component according to the mass ratio of acrylate adhesive: curing agent: toluene of 30:1.5:20. At an ambient temperature of 20 °C, first mix and stir toluene and acrylate adhesive for 10 minutes, then add the curing agent and stir for another 10 minutes, and measure the viscosity with a rotational viscometer to be 120 centipoise.

[0135] Based on the above materials, this embodiment provides a preparation method of a reflective heat-insulating film, including the following steps:

[0136] Coat the mixed material for forming the wear-resistant layer on one surface of the laminated reflective film, dry at a temperature of 130 °C and cure with ultraviolet light to obtain the wear-resistant layer;

[0137] Coat the mixed material of the ultraviolet barrier pressure-sensitive adhesive layer on the other surface of the laminated reflective film, place it at a temperature of 150 °C for 120 seconds and then cure to obtain the ultraviolet barrier pressure-sensitive adhesive layer;

[0138] Compound the surface of the base film of the functional layer on the side of the ultraviolet barrier pressure-sensitive adhesive layer away from the laminated reflective film;

[0139] Compound the release film on the surface of the nano heat-insulating layer of the functional layer to obtain a reflective heat-insulating film with all layers compounded into one body.

[0140] As Figure 4 and Figure 5 shown, in this embodiment, the resin overlapping layer is composed of a Resin A layer 6 and a Resin B layer 7, which are laid overlapping layer by layer. Among them, the thickness of the Resin A layer 6 is 100 nm, and the thickness of the Resin B layer 7 is calculated according to the formula provided by the present invention to be 105 nm.

[0141] Among them, on the Resin A layer 6, there are protrusions 61 with a height of 2 nm and a bottom area of 4 nm 2 ; the protrusions 61 are arranged in a dot matrix.

[0142] Performance test

[0143] Test instrument: Ultraviolet-visible-near-infrared spectrophotometer

[0144] Test method: Observe the reflection spectrum between 250nm and 2500nm measured by the instrument. In the spectrum, the wavelength range of the reflected infrared rays, the reflectivity value, and the heat insulation and barrier can be observed. Through the test monitoring of the full-band spectrophotometer, observe the wavelength of the infrared reflection film in the spectrum. The spectra of reflection films with different thicknesses show different reflection wavelength ranges. Then, the more infrared rays in the sunlight it reflects, and the discomfort caused by radiant heat is reduced by truncating near-infrared rays.

[0145] The above are only the preferred embodiments of the present invention and do not impose any form of limitation on the present invention. Although the present invention has been shown above with preferred embodiments, it is not intended to

[0146] limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments with equivalent changes by using the disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A laminated reflective film, characterized in that, The laminated reflective film is a resin overlapping layer formed by overlapping different resins; The resin overlapping layer includes a resin A layer and a resin B layer. The number of layers of the resin overlapping layer is 100 to 300 layers; By adjusting the thickness of the resin A layer and the resin B layer, an interference reaction occurs to reflect light of different wavelengths in sunlight; The thickness of the resin A layer and the thickness of the resin B layer are determined by the following formula: where h1 and h2 are the thicknesses of the resin A layer and the resin B layer respectively, and the unit is nm; γ1 and γ2 are the refractive indices of the resin A layer and the resin B layer respectively; a is an adjustment coefficient, and the unit is 1; The thickness of the laminated reflective film is 10 to 200 μm.

2. The laminated reflective film according to claim 1, wherein The thickness of the resin A layer is 90 to 100 nm.

3. A laminated reflective film according to claim 1, characterized in that, The a is determined according to the reflected infrared wavelength; The refractive index of the resin A layer is 1.655 to 1.70, and the refractive index of the resin B layer is 1.68 to 1.

72.

4. A reflective heat-insulating film comprising the laminated reflective film according to any one of claims 1 to 3, characterized in that, The reflective and heat-insulating film sequentially includes: an abrasion-resistant layer, a laminated reflective film, a functional layer, an ultraviolet-blocking pressure-sensitive adhesive layer, and a release film; wherein, the number of the functional layers is 0 to 5 layers; wherein, the functional layer includes a nano heat-insulating layer and a base film.

5. The reflective heat-insulating film according to claim 4, wherein The base film is a transparent polyester film or a laminated reflective film.

6. The reflective heat-insulating film according to claim 4, wherein The total thickness of the reflective heat-insulating film is 53 to 556 μm.

7. The reflective heat-insulating film according to claim 4, wherein The thickness of the laminated reflective film is 12 to 188 μm.

8. A reflective heat-insulating film according to claim 4, characterized in that, The thickness of the nano heat-insulating layer is 3 to 30 μm.

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