Total reflection miniature triple prism array temperature control film and application thereof

Abstract

The invention provides a total-reflection miniature triangular prism array temperature control film and application thereof, the total-reflection miniature triangular prism array temperature control film comprises a flexible substrate, a miniature triangular prism array and a light-transmitting protective layer, and the flexible substrate, the miniature triangular prism array and the light-transmitting protective layer are sequentially laminated to form a sandwich type laminated structure; the flexible substrate serves as a substrate and is used for being attached to a temperature control object. The light-transmitting protective layer is formed as a surface layer, receives sunlight radiation, and irradiates into the micro prism array after passing through the sunlight radiation; the micro prism array comprises an array structure formed by a plurality of micro prisms, and the bottom surface of each prism faces the light-transmitting protection layer and is fixedly bonded with the light-transmitting protection layer. The temperature control film has high reflectivity in an infrared band, reflects visible light and light in a near-infrared band, effectively reflects heat out in an atmosphere window band, improves the control capability on sunlight radiation, and realizes cooling and temperature control effects.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature control films, and in particular to a total reflection micro prism array temperature control film and applications thereof. Background Art

[0002] The materials used in traditional radiative cooling include highly emissive polymers and highly reflective metals. For example, polytetrafluoroethylene has high emissivity, but its solar energy absorption rate is high; aluminum sheets have high reflectivity, but low emissivity in the mid-infrared band. The finished products made into cooling materials usually have fixed structures and shapes, which are difficult to adjust according to actual conditions.

[0003] Taking the specific application of the vehicle center console as an example, the surface design is an atypical plane with a slope at an unspecified angle and direction, accompanied by irregular designs such as holes, grooves and grids in different positions. The surface material is hard plastic or leather, which absorbs heat and produces a large temperature rise after being radiated by sunlight. In particular, the black center console can reach a surface temperature of 40°C or even above 50°C under direct sunlight in summer, resulting in a very high temperature inside the car, which has a serious impact on the aging of the interior surface trim and vehicle safety (spontaneous combustion, thermal failure, etc.). Summary of the invention

[0004] According to the first aspect of the purpose of the present invention, there is provided a total reflection micro-prism array temperature control film, which has a high reflectivity in the infrared band, reflects light in the visible and near-infrared bands, and effectively reflects heat in the atmospheric window band, thereby improving the ability to control solar radiation and achieving a cooling and temperature control effect.

[0005] According to a first aspect of the present invention, a total reflection micro-prism array temperature control film comprises a flexible substrate, a micro-prism array and a light-transmitting protective layer, wherein the flexible substrate, the micro-prism array and the light-transmitting protective layer are sequentially stacked to form a sandwich laminate structure;

[0006] The flexible substrate is used as a substrate to fit the temperature-controlled object;

[0007] The light-transmitting protective layer is constituted as a surface layer, receiving solar radiation and then passing through and projecting into the micro-prism array;

[0008] The micro prism array comprises an array structure formed by a plurality of micro prisms, wherein the bottom surface of each prism faces the light-transmitting protective layer and is bonded and fixed to the light-transmitting protective layer.

[0009] As an optional embodiment, the light-transmitting protective layer is a thin transparent light-transmitting plastic, such as a transparent acrylic plate. On the one hand, it protects the micro prism from the influence of external force, heavy pressure, dust and other impurities on the micro prism, which would weaken its high-reflection performance. On the other hand, it ensures that the bottom surface of the micro prism faces the direct direction of sunlight as much as possible, thereby improving the temperature control effect.

[0010] As an optional embodiment, the thickness of the thin transparent light-transmitting plastic is controlled to be 0.5-2 mm.

[0011] As an optional embodiment, the flexible substrate is a flexible film layer, including one of PP, PE, PVC, and silicone film layers. Thus, the temperature control film can adapt to the different shapes, inclinations, and other surface designs of the vehicle center console, ensuring the fit and firm adhesion between the two.

[0012] As an optional embodiment, the micro prism is a prism structure made of HZF88 glass material, which partially reflects the visible light and near-infrared light in the sunlight that penetrates the light-transmitting protective layer to suppress temperature rise. As an optional method, each micro prism adopts the same structure and size design, with a side length of less than or equal to 5mm, especially a design with a side length between 0.5-2mm.

[0013] As an optional embodiment, each micro prism in the micro prism array is bonded to the flexible substrate via ultraviolet light curing glue. Each micro prism in the micro prism array is bonded to the flexible substrate via ultraviolet light curing glue.

[0014] Therefore, in the temperature-control film based on the micro-prism array design, the design of the HZF88 material ensures that after the sunlight enters the material, the light is totally reflected inside the material due to the refractive index characteristics of the material, ensuring the effective reflection of the sunlight and preventing solar radiation from directly heating the surface of the object, thereby reducing heat absorption, reducing heat load, suppressing temperature rise in the vehicle, protecting the center console surface from radiation damage, and achieving a cooling effect. At the same time, it reduces the cooling capacity of the vehicle's air-conditioning refrigeration system and reduces energy consumption.

[0015] According to the second aspect of the present invention, a total reflection micro prism array temperature control film is used in the surface temperature control of the automobile center console, comprising:

[0016] Cutting the total reflection micro prism array temperature control film into a contoured temperature control film according to the contour and size of the automobile center console;

[0017] The contoured temperature control film is attached to the surface of the automobile center console, wherein the flexible substrate contacts and adheres to the surface of the automobile center console.

[0018] According to the third aspect of the present invention, a total reflection micro prism array temperature control film is used in the temperature control of a car sunroof, comprising:

[0019] Cutting the total reflection micro prism array temperature control film into a contoured temperature control film according to the contour and size of the automobile sunroof;

[0020] The contoured temperature control film is attached to the outer surface of the automobile sunroof, wherein the flexible substrate is in contact with and adheres to the outer surface of the automobile sunroof.

[0021] According to a fourth aspect of the present invention, a total reflection micro prism array temperature control film is used in the temperature control of a car skylight, comprising:

[0022] Cutting the total reflection micro prism array temperature control film into a contoured temperature control film according to the contour and size of the automobile skylight;

[0023] The contoured temperature control film is attached to the outer surface of the automobile sunroof, wherein the flexible substrate contacts and fits the outer surface of the automobile sunroof.

[0024] It should be understood that in the application of the aforementioned second aspect, the bottom surface of the contoured temperature control film and the vehicle center console may be fixed by adhesive bonding, or may be directly bonded without adhesive bonding.

[0025] It should be understood that all combinations of the aforementioned concepts and the additional concepts described in more detail below can be considered as part of the inventive subject matter of the present disclosure as long as such concepts are not mutually inconsistent. In addition, all combinations of the claimed subject matter are considered as part of the inventive subject matter of the present disclosure.

[0026] The foregoing and other aspects, embodiments and features of the present invention can be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as the features and / or beneficial effects of the exemplary embodiments, will be apparent from the following description or learned from the practice of the specific embodiments according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of a total reflection type micro prism array temperature control film according to an embodiment of the present invention.

[0028] Figure 2 is a partial schematic diagram of a micro prism array according to an embodiment of the present invention.

[0029] Figure 3 It is a schematic diagram of the combination of a temperature control film and a central console of a car according to an embodiment of the present invention.

[0030] Figure 4It is a schematic diagram of the optical path of the temperature control film according to an embodiment of the present invention in combination with the automobile center console.

[0031] Figures 5 to 8 Respectively expressed according to Figure 4 Schematic diagram of the optical path structure of the embodiment at different incident angles.

[0032] Fig. 9 It is a test schematic diagram of a prism array with cross sections arranged in a north-south direction according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] In order to better understand the technical content of the present invention, specific embodiments are given and described as follows in conjunction with the accompanying drawings.

[0034] Various aspects of the present invention are described in this disclosure with reference to the accompanying drawings, in which many illustrative embodiments are shown. The embodiments of the present disclosure are not necessarily intended to include all aspects of the present invention. It should be understood that the various concepts and embodiments introduced above, as well as those described in more detail below, can be implemented in any of many ways, because the concepts and embodiments disclosed by the present invention are not limited to any implementation. In addition, some aspects disclosed by the present invention can be used alone or in any appropriate combination with other aspects disclosed by the present invention.

[0035] {Example 1}

[0036] Combination Figure 1 , Figure 2 As shown, the total reflection micro prism array temperature control film according to an embodiment of the present invention comprises a flexible substrate 1, a micro prism array 2 and a light-transmitting protective layer 3. The flexible substrate 1, the micro prism array 2 and the light-transmitting protective layer 3 are sequentially stacked to form a sandwich laminated structure.

[0037] The flexible substrate 1 is used as a substrate to fit with a temperature-controlled object, such as a center console, a sunroof, a skylight, etc. of a car.

[0038] The light-transmitting protective layer 3 is constructed as a surface layer, which receives solar radiation and then passes through and is incident on the micro-prism array 2 .

[0039] The micro prism array 2 includes an array structure formed by a plurality of micro prisms. The bottom surface of each prism faces the light-transmitting protective layer 3 and is bonded and fixed to the light-transmitting protective layer 3 .

[0040] As an optional embodiment, the side length of each micro prism in the micro prism array 2 is less than or equal to 5 mm. In particular, based on the consideration of the manufacturing process and the bonding process and efficiency, each micro prism adopts the same structure and size design, and the side length is less than or equal to 5 mm, and in particular, the side length is designed between 0.5-2 mm.

[0041] As an optional embodiment, each micro prism adopts the same structure and size design, with a side length less than or equal to 5 mm, and in particular, a side length between 0.5-2 mm.

[0042] As an optional embodiment, the light-transmitting protective layer 3 is a thin transparent light-transmitting plastic, such as a thin sheet of acrylic transparent plate, with a thickness of 0.5-2 mm.

[0043] As an optional embodiment, the flexible substrate 1 is a flexible film layer, including one of PP, PE, PVC, and silicone film layers, which can conform to the surface of the temperature control object to which it is attached. As an optional solution, the thickness of the flexible substrate 1 is 1-5 mm.

[0044] As a preferred embodiment, the surface where the flexible substrate 1 and the micro prism are combined is coated with a UV adhesive layer.

[0045] As an optional embodiment, the micro prism is a prism structure made of HZF88 glass material, which partially reflects back the visible light and near-infrared light in the sunlight that penetrates the light-transmitting protective layer 3 to suppress the temperature rise.

[0046] In an embodiment of the present invention, the prism structure of HZF88 glass material has a lower solar energy absorption rate than polytetrafluoroethylene and has excellent reflectivity. The refractive index Nd of the prism structure of HZF88 glass material is 1.946, which can effectively control the path and direction of light in the optical system. In the design of the radiation temperature control film, it can significantly enhance the temperature control film's ability to control infrared radiation, thereby improving the cooling efficiency.

[0047] At the same time, the dispersion coefficient (17.942@587.6nm) of the prism structure of HZF88 glass material is low, ensuring the performance consistency of the material at different wavelengths, thereby optimizing its thermal radiation control efficiency in the infrared band. The high emissivity of HZF88 in the infrared band can effectively radiate heat, thereby achieving a cooling effect.

[0048] In the embodiment of the present invention, sunlight can be approximately regarded as parallel light. When it irradiates the temperature control film, penetrates the surface light-transmitting protective layer 3 and reaches the surface of the prism structure, due to the high reflective properties of the HZF88 material, the visible light and near-infrared light in the sunlight are effectively reflected, while the radiation in the mid-infrared band is absorbed by the material. Using a single ray of light, it can be intuitively seen that when parallel light enters the prism system made of HZF88 material, it satisfies the total reflection condition (n1*sinθ1=n2*sinθ2). Therefore, while reflecting solar radiation, it can effectively pass through the atmospheric window, that is, the mid-infrared band of 8-13 microns. The transmittance in the mid-infrared band enables it to effectively dissipate the heat on the surface of the object in the form of radiation without being absorbed by the gas in the atmosphere, thereby achieving effective temperature control, protecting the irradiated surface from radiation damage, and achieving a cooling effect at the same time.

[0049] It should be understood that in the embodiments of the present invention, according to the law of total reflection n1*sinθ1=n2*sinθ2, where n1 is the refractive index of air, which is 1.003, and n2 is 1.946, the isosceles angle θ2 of each micro prism should be less than 59°.

[0050] According to an embodiment of the present invention, each micro-prism in the micro-prism array 2 is bonded to the flexible substrate 1 via UV-curable glue.

[0051] According to an embodiment of the present invention, each micro-prism in the micro-prism array 2 is bonded to the flexible substrate 1 via UV-curable glue.

[0052] In an embodiment of the present invention, ultraviolet curing glue (UV glue) is used for optical bonding. It is an adhesive that is cured by ultraviolet radiation. UV glue can bond different materials together to form a strong structure. While ensuring the stability and reliability of optical elements and a short curing time, it has good weather resistance, ensuring the stability and reliability of the temperature control film during long-term use under solar radiation.

[0053] In an embodiment of the present invention, the micro prism can be made by existing optical processing technology, including: cutting the HZF88 glass plate blank to size, milling, fine grinding, polishing, chamfering, inspection and other processes according to the designed size, to obtain a finished uncoated prism structure, which is stored in the warehouse for standby use.

[0054] In this embodiment, combined with Figure 3 , 4 As shown, the center console of a car is taken as an example for explanation. Figure 3 , 4 The combined application of the temperature control film 100 and the air conditioner 200 in the car and the optical path structure thereof are exemplarily shown.

[0055] Combination Figures 5 to 8 As shown in Figure 1, it shows the optical path structure under different incident angles. Figure 5 As shown in the figure, when the incident light is at an angle of 80-90° to the bottom surface of the prism of the film, almost all of the incident light is totally reflected and does not enter the center console below. Figure 6 , Figure 7 , Figure 8 As shown, when sunlight is incident at an angle, part of the optical fiber enters the central console through the prism of the film for heat absorption effect. However, when sunlight is incident at an angle (such as in the morning and evening), the light intensity and energy density are much lower than those when it is directly incident (such as at noon and other times when sunlight radiation is the strongest). Even if a small amount is absorbed, the speed and amplitude of the temperature rise are relatively low, thus achieving the purpose of temperature control.

[0056] At the same time, combined with Figures 5 to 8 It can be seen that through the temperature control film proposed in the present invention, sunlight is fully reflected after being incident or partially penetrates the film and is absorbed by the center console. It will not be reflected through the center console to the human eye to cause glare, causing discomfort and adverse visual reactions to the driver.

[0057] The hazards of solar radiation are mainly reflected in the potential damage to human body and materials caused by ultraviolet rays and some visible light in solar radiation. Through the temperature control film designed by the present invention, the total reflection prism system can effectively reflect harmful radiation, protect the surface of objects from radiation damage, and achieve a cooling effect at the same time, which not only improves the cooling efficiency of the system and reduces the glare characteristics of the center console, but also enhances its safety and durability in practical applications.

[0058] {Example 2}

[0059] In this embodiment, a preparation process of the aforementioned temperature control film is proposed, comprising the following steps:

[0060] Step 1. Select a PVC transparent board with a thickness of 1-2mm and clean and dry it. Clean the surface to ensure there is no dust, oil or other impurities.

[0061] Step 2: Apply UV glue evenly on one side of the PVC transparent board;

[0062] Step 3, using a plurality of long strip molds to place the triangular prism structure therein, with the bottom surface facing upward and at least a portion exposed (protruding from the edge of the mold);

[0063] Step 4: Place multiple long strip molds with prism structures in parallel in the same direction on the same horizontal plane, and ensure that both sides are aligned, and then align the glue-coated PVC transparent plate with the long strip mold and press lightly from above so that the bottom surface of the prism structure is bonded to the surface of the PVC transparent plate, and then wait for the glue to cure and set, which can be done by irradiation with a light-curing UV lamp or under sunlight;

[0064] Step 5: Apply glue (UV glue) to the surface of the PVC film layer with a thickness of 1-5 mm, combine the fixed prism structure with the PVC film layer, and cure it by irradiating it with a light-curing ultraviolet lamp or curing it under sunlight to obtain a temperature-controlled film structure.

[0065] In a particularly optional embodiment, the thickness of the glue applied on the surface of the PVC film layer can be relatively high to ensure effective fixation of the prism structure.

[0066] {Example 3}

[0067] In this embodiment, we conduct a thermodynamic test on the prepared temperature control film. During the test, a purchased black sheet of PC / ABS material is used as the center console bottom film material.

[0068] A strong searchlight is used to imitate the strong light radiation of sunlight. The light source power is selected to be 150W, white light, and the light intensity reaches more than 50000lx.

[0069] In the first group of experiments, we used white light with a light source power of 150W to illuminate the center console film (sunglasses, used as a control group) and the center console film covered with the temperature control film proposed in the present invention.

[0070] In the first set of experiments, the room temperature was 25.6°C.

[0071] According to the incident angles of direct radiation, 85°, 80°, 75°, 60°, 45°, and 30°, the temperature of the center console film was read using a thermocouple temperature sensor after 5 minutes of irradiation, which were 26.7°C, 27.6°C, 27.8°C, 28°C, 28.3°C, 29°C, and 29.7°C, respectively. The temperature of the center console film not covered with the temperature control film was 46.6°C, as shown in Table 1.

[0072] Table 1

[0073]

[0074] In the second group of experiments, we conducted the experiment at room temperature of 27.3℃, using the same irradiation conditions and irradiation time as the first group of experiments. The difference from the first group was that the rotation angle of the prism was changed, and strong light was used to pass through the temperature control film to irradiate the center console film and the uncovered center console film (control group). Fig. 9 An example along the north-south direction is shown.

[0075] According to the incident angle, the selected angles are normal (i.e. 0°), 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, and 90°, and the prism array is placed in two ways (the cut surface is placed in the north-south direction and the cut surface is placed in the east-west direction). The test records and compares the temperature rise differences, as shown in Table 2 below.

[0076] Table 2

[0077]

[0078] It can be seen that the temperature control film proposed in the present invention can effectively suppress the temperature rise of the black center console bottom film, significantly reduce heat absorption and heat load under high-power strong light irradiation, and achieve reliable thermal management.

[0079] {Example 4}

[0080] In this embodiment, an application of a reflective micro-prism array temperature control film in the surface temperature control of a car center console is proposed, including:

[0081] Cutting the total reflection micro prism array temperature control film into a contoured temperature control film according to the contour and size of the automobile center console;

[0082] The contoured temperature control film is attached to the surface of the center console of the car, wherein the flexible substrate 1 is in contact with and attached to the surface of the center console of the car.

[0083] {Example 5}

[0084] In this embodiment, an application of a total reflection micro prism array temperature control film in the temperature control of a car sunroof is proposed, including:

[0085] Cutting the total reflection micro prism array temperature control film into a contoured temperature control film according to the contour and size of the automobile sunroof;

[0086] The contoured temperature control film is attached to the outer surface of the automobile sunroof, wherein the flexible substrate 1 is in contact with and attached to the outer surface of the automobile sunroof.

[0087] {Example 6}

[0088] In this embodiment, an application of a total reflection micro prism array temperature control film in the temperature control of a car skylight is proposed, including:

[0089] Cutting the total reflection micro prism array temperature control film into a contoured temperature control film according to the contour and size of the automobile skylight;

[0090] The contoured temperature control film is attached to the outer surface of the automobile sunroof, wherein the flexible substrate 1 is in contact with and attached to the outer surface of the automobile sunroof.

[0091] It should be understood that in the aforementioned embodiment 4, the temperature control film and the surface of the automobile center console may be bonded with glue (glue, tape, etc.), or the film may be placed directly without gluing.

[0092] In Embodiment 5 and Embodiment 6, the temperature control film and the sunroof or skylight of the automobile can be fixed by gluing to ensure fixation between the two.

[0093] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. A total reflection micro prism array temperature control film, characterized in that: It comprises a flexible substrate (1), a micro-prism array (2) and a light-transmitting protective layer (3), wherein the flexible substrate (1), the micro-prism array (2) and the light-transmitting protective layer (3) are stacked in sequence to form a sandwich-type stacked structure; The flexible substrate (1) is used as a substrate to fit the temperature-controlled object; The light-transmitting protective layer (3) is constructed as a surface layer, receives solar radiation and then passes through and enters the micro-prism array (2); The micro prism array (2) comprises an array structure formed by a plurality of micro prisms, wherein the bottom surface of each prism faces the light-transmitting protective layer (3) and is bonded and fixed to the light-transmitting protective layer (3).

2. The total reflection micro prism array temperature control film according to claim 1, characterized in that: The light-transmitting protective layer (3) is a thin, transparent light-transmitting plastic.

3. The total reflection micro prism array temperature control film according to claim 1, characterized in that: The flexible substrate (1) is a flexible film layer, including one of PP, PE, PVC and silicone film layers.

4. The total reflection micro prism array temperature control film according to claim 1, characterized in that: The micro prism is a prism structure made of HZF88 glass material, which reflects back the visible light and near-infrared light in the sunlight that penetrates the light-transmitting protective layer (3), thereby suppressing the temperature rise.

5. The total reflection micro prism array temperature control film according to claim 1, characterized in that: Each micro prism in the micro prism array (2) is bonded to the flexible substrate (1) via ultraviolet light curing glue.

6. The total reflection micro prism array temperature control film according to claim 1, characterized in that: Each micro prism in the micro prism array (2) is bonded to the flexible substrate (1) via ultraviolet light curing glue.

7. The total reflection micro prism array temperature control film according to claim 1, characterized in that: The side length of each micro prism in the micro prism array (2) is less than or equal to 5 mm.

8. Application of a total reflection micro prism array temperature control film in the surface temperature control of a car center console, characterized in that: include: Cutting the total reflection micro prism array temperature control film into a contoured film according to the contour and size of the automobile center console; The contoured film is attached to the surface of the center console of the car, wherein the flexible substrate (1) contacts and adheres to the surface of the center console of the car.

9. Application of a total reflection micro prism array temperature control film in automobile sunroof temperature control, characterized in that: include: Cutting the total reflection micro prism array temperature control film into a contoured film according to the contour and size of the automobile sunroof; The contoured film is attached to the outer surface of the automobile sunroof, wherein the flexible substrate (1) is in contact with and adheres to the outer surface of the automobile sunroof.

10. Application of a total reflection micro prism array temperature control film in automobile skylight temperature control, characterized in that: include: Cutting the total reflection micro prism array temperature control film into a contoured film according to the contour and size of the automobile skylight; The contoured film is attached to the outer surface of the automobile sunroof, wherein the flexible substrate (1) is in contact with and adheres to the outer surface of the automobile sunroof.

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