Decorative film and preparation method thereof, shell and electronic equipment

Abstract

The invention provides a decorative film and a preparation method thereof, a shell and electronic equipment. The decorative film comprises a plurality of first texture parts and a plurality of second texture parts, the first texture parts and the second texture parts are arranged alternately, the first texture parts and the second texture parts are bent, when the decorative film is in a first environment, the first texture parts have a first color, and when the decorative film is in a second environment, the second texture parts have a second color. When the decorative film is in a first environment, the first texture parts have a first color, the plurality of first texture parts are matched with the plurality of second texture parts to enable the decorative film to present a first pattern, when the decorative film is in a second environment, the first texture parts have a second color, and the plurality of first texture parts are matched with the plurality of second texture parts to enable the decorative film to present a second pattern; the second texture part has a third color, and the first color is different from the second color. The decorative film disclosed by the embodiment of the invention has a color changing function and relatively good appearance expressive force.

Description

Technical Field

[0001] The present application relates to the field of electronics, and in particular to a decorative film and a preparation method thereof, a housing and an electronic device. Background Art

[0002] With the development of technology and the improvement of living standards, people have put forward higher requirements for the visual effects of the appearance of electronic devices. However, the appearance of the shell of the electronic device in the related art is not expressive enough and cannot well meet the needs of consumers. Summary of the invention

[0003] The embodiment of the present application provides a decorative film, which has a color-changing function and has good appearance expression.

[0004] In the first aspect, an embodiment of the present application provides a decorative film, which includes: a plurality of first texture portions and a plurality of second texture portions, the plurality of first texture portions and the plurality of second texture portions are partially alternately arranged, the first texture portions and the second texture portions are both curved, when the decorative film is in a first environment, the first texture portion has a first color, the plurality of first texture portions cooperate with the plurality of second texture portions to make the decorative film present a first pattern, when the decorative film is in a second environment, the first texture portion has a second color, the plurality of first texture portions cooperate with the plurality of second texture portions to make the decorative film present a second pattern, the second texture portion has a third color, wherein the first color is different from the second color.

[0005] In a second aspect, the present application also provides a method for preparing a decorative film, which comprises:

[0006] Providing a first polymer powder and a first decorative powder, and forming the first polymer powder and the first decorative powder into a first sheet;

[0007] Providing a second polymer powder and a second decorative powder, and forming the second polymer powder and the second decorative powder into a second sheet;

[0008] The first sheet and the second sheet are stacked according to a preset rule and extruded to form a prefabricated strip;

[0009] stacking a plurality of the prefabricated strips, pressing and slicing them to obtain an intermediate membrane sheet; and

[0010] stretching the intermediate film to obtain the decorative film;

[0011] Among them, the decorative film includes a plurality of first texture portions and a plurality of second texture portions, the plurality of first texture portions and the plurality of second texture portions are partially alternately arranged, the first texture portion and the second texture portion are curved, when the decorative film is in a first environment, the first texture portion has a first color, the plurality of first texture portions cooperate with the plurality of second texture portions to make the decorative film present a first pattern, when the decorative film is in a second environment, the first texture portion has a second color, the plurality of first texture portions cooperate with the plurality of second texture portions to make the decorative film present a second pattern, the second texture portion has a third color, wherein the first color is different from the second color.

[0012] In a third aspect, an embodiment of the present application further provides a housing, the housing comprising:

[0013] a first substrate layer;

[0014] The decorative film according to the first aspect of the present application or the decorative film prepared by the method for preparing the decorative film according to the second aspect of the present application, wherein the decorative film is disposed on one side of the first substrate layer; and

[0015] The second substrate layer is disposed on a side of the decorative film away from the first substrate layer.

[0016] In a fourth aspect, an embodiment of the present application further provides an electronic device, comprising:

[0017] Display screen;

[0018] The housing according to the embodiment of the present application is arranged opposite to the display screen; and

[0019] A processor is located between the housing and the display screen, and the processor is electrically connected to the display screen to control the display screen to display.

[0020] The decorative film of the embodiment of the present application includes a plurality of first texture parts and a plurality of second texture parts, the plurality of first texture parts and the plurality of second texture parts are partially arranged alternately, the first texture part and the second texture part are both flowing texture parts, when the decorative film is in a first environment, the first texture part has a first color, the plurality of first texture parts cooperate with the plurality of second texture parts to make the decorative film present a first pattern, when the decorative film is in a second environment, the first texture part has a second color, the plurality of first texture parts cooperate with the plurality of second texture parts to make the decorative film present a second pattern, the second texture part has a third color, wherein the first color is different from the second color. Thus, the decorative film can present different colors and patterns in different environments, and when applied to electronic devices, the electronic devices can have a better appearance effect, increase the interaction between the electronic devices and users, and improve the playability of the electronic devices. In addition, the plurality of first texture parts and the plurality of second texture parts are partially arranged alternately, the first texture part and the second texture part are both flowing texture parts, and the color and flowing texture design of the first texture part and the second texture part can make the decorative film present the effect of a variety of color combinations and flowing texture combinations, improve the designability of the decorative film, and better meet the needs of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the planar structure of a decorative film according to an embodiment of the present application.

[0023] Figure 2 Schematic diagram of the structure of a thermochromic powder according to an embodiment of the present application.

[0024] Figure 3 It is a schematic diagram of a process for preparing a decorative film according to an embodiment of the present application.

[0025] Figure 4 It is a schematic diagram of a process for preparing a first sheet body according to an embodiment of the present application.

[0026] Figure 5 It is a schematic flow chart of a method for preparing a second sheet according to an embodiment of the present application.

[0027] Figure 6 It is a schematic flow chart of a method for preparing a prefabricated strip from a first sheet and a second sheet according to an embodiment of the present application.

[0028] Figure 7 It is a schematic flow chart of a method for preparing an intermediate membrane from a prefabricated strip according to an embodiment of the present application.

[0029] Figure 8 It is a schematic flow chart of a method for preparing a decorative film from an intermediate film according to an embodiment of the present application.

[0030] Fig. 9 This is a scanning electron microscope image of the color change process of the thermochromic powder of Example 1 of the present application.

[0031] Fig.10 This is a picture of the decorative film of Example 1 of the present application at the first temperature.

[0032] Fig.11 This is a picture of the decorative film of Example 1 of the present application at the second temperature.

[0033] Fig.12 This is a picture of the decorative film of Example 2 of the present application during the day.

[0034] Fig.13 This is a picture of the decorative film of Example 2 of the present application in a dark environment.

[0035] Fig.14 This is a picture of the decorative film of Example 3 of the present application used indoors.

[0036] Fig.15 This is a picture of the decorative film of Example 3 of the present application after being irradiated with ultraviolet light.

[0037] Fig.16 It is a structural schematic diagram of a shell according to an embodiment of the present application.

[0038] Fig.17 The shell of one embodiment of the present application is along Fig.16 Schematic diagram of the cross-sectional structure in the AA direction.

[0039] Fig.18 It is a schematic cross-sectional structural diagram of a shell of another embodiment of the present application.

[0040] Fig.19 It is a schematic cross-sectional structural diagram of a shell of yet another embodiment of the present application.

[0041] Fig. 20 The following are product photos of a shell according to an embodiment of the present application when applied to a mobile phone, wherein (a) is a schematic diagram of the local structure of the mobile phone before the color changes, and (b) is a schematic diagram of the structure of the mobile phone after the color changes.

[0042] Fig.21 It is a schematic diagram of the structure of an electronic device according to an embodiment of the present application.

[0043] Fig. 22 It is a schematic diagram of a partial exploded structure of an electronic device according to an embodiment of the present application.

[0044] Fig.23 It is a circuit block diagram of an electronic device according to an embodiment of the present application.

[0045] Description of reference numerals:

[0046] 100-decorative film, 10-first texture portion, 20-second texture portion, 11-thermochromic powder, 111-color-changing core, 112-shell, 300-shell, 310-first substrate layer, 320-second substrate layer, 330-first adhesive layer, 340-second adhesive layer, 350-hardening layer, 360-cover bottom layer, 400-electronic device, 410-display screen, 420-middle frame, 430-processor, 450-memory, 470-camera module, 301-light-transmitting portion. DETAILED DESCRIPTION

[0047] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0048] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0049] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0050] It should be noted that, for the convenience of explanation, in the embodiments of the present application, the same figure marks represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments.

[0051] With the development of technology and the improvement of living standards, people have put forward higher requirements for the visual effects of the appearance of electronic devices. However, the appearance of the shell of the electronic device in the related art is not expressive enough and cannot well meet the needs of consumers.

[0052] See also Figure 1 The embodiment of the present application provides a decorative film 100, which includes: a plurality of first texture portions 10 and a plurality of second texture portions 20, wherein the plurality of first texture portions 10 and the plurality of second texture portions 20 are partially alternately arranged, and the first texture portions 10 and the second texture portions 20 are both curved. When the decorative film 100 is in a first environment, the first texture portion 10 has a first color, and the plurality of first texture portions 10 cooperate with the plurality of second texture portions 20 to make the decorative film 100 present a first pattern. When the decorative film 100 is in a second environment, the first texture portion 10 has a second color, and the plurality of first texture portions 10 cooperate with the plurality of second texture portions 20 to make the decorative film 100 present a second pattern, and the second texture portion 20 has a third color, wherein the first color is different from the second color.

[0053] The decorative film 100 of the embodiment of the present application can be applied to portable electronic devices such as mobile phones, tablet computers, laptop computers, desktop computers, smart bracelets, smart watches, e-readers, game consoles, etc. The decorative film 100 is used to make the electronic device have a better appearance.

[0054] It should be noted that the first texture portion 10 and the second texture portion 20 may be arranged alternately in a disordered manner.

[0055] Optionally, one first texture portion 10 and one second texture portion 20 may be arranged alternately in sequence, one first texture portion 10 and two second texture portions 20 may be arranged alternately in sequence, two first texture portions 10 and one second texture portion 20 may be arranged alternately in sequence, or two first texture portions 10 and two second texture portions 20 may be arranged alternately. The alternating arrangement of the first texture portion 10 and the second texture portion 20 may be regular or irregular.

[0056] The extension direction of the first texture part 10 and the second texture part 20 may extend in a flowing manner (ie, extend in a curve or in a wavy line). The extension direction of the first texture part 10 may extend regularly or irregularly.

[0057] Optionally, the curved shape may include but is not limited to at least one of curved strips, spirals, wavy patterns, flowing shapes, etc.

[0058] Optionally, the first texture portion 10 and the second texture portion 20 are both curved strip-shaped texture portions.

[0059] It should be noted that the plurality of first texture portions 10 and the plurality of second texture portions 20 are an integrated structure. In other words, the plurality of first texture portions 10 and the plurality of second texture portions 20 are different parts of the same decorative film 100, and the plurality of first texture portions 10 and the plurality of second texture portions 20 can be formed in the same process. It can also be understood that the plurality of first texture portions 10 and the plurality of second texture portions 20 are connected as a whole.

[0060] It is understandable that the first color and the third color may be the same or different. It is understandable that the second color and the third color may be the same or different.

[0061] Optionally, the first colors of the plurality of first texture portions 10 may be the same, or the first colors of some of the plurality of first texture portions 10 may be the same, and the first colors of some of the plurality of first texture portions 10 may be different.

[0062] Optionally, the second colors of the plurality of first texture portions 10 may be the same, or the second colors of some of the plurality of first texture portions 10 may be the same, and the second colors of some of the plurality of first texture portions 10 may be different.

[0063] Optionally, the third colors of the plurality of second texture portions 20 may be the same, or the third colors of some of the second texture portions 20 may be the same, and the third colors of some of the second texture portions 20 may be different.

[0064] By designing the first color, the second color and the third color, the decorative film 100 can have more than one color, and at least part of the colors can be changed.

[0065] It should be noted that when the environment of the decorative film 100 changes between the first environment and the second environment, the first texture portion 10 can be reversibly switched between the first color and the second color, and the decorative film 100 can be reversibly switched between the first pattern and the second pattern.

[0066] Optionally, the first color may be but is not limited to at least one of white, colorless (i.e. transparent), yellow, gold, blue, silver, red, pink, rose red, royal blue, orange red, green, purple red, emerald green, orange, cyan, purple, gray, etc.

[0067] Optionally, the second color may be but is not limited to at least one of white, colorless (i.e. transparent), yellow, gold, blue, silver, red, pink, rose red, royal blue, orange red, green, purple red, emerald green, orange, cyan, purple, gray, etc.

[0068] Optionally, the third color can be but is not limited to at least one of white, colorless (i.e. transparent), yellow, gold, blue, silver, red, pink, rose red, royal blue, orange-red, green, purple-red, emerald green, orange, cyan, purple, gray, etc.

[0069] Optionally, the environment may include but is not limited to at least one of temperature, light of different wavelengths, brightness, and the like.

[0070] Optionally, the first pattern is at least partially different from the second pattern.

[0071] Optionally, the first pattern and the second pattern may differ in at least one of color, shape, brightness, texture, etc.

[0072] The decorative film 100 of the embodiment of the present application includes a plurality of first texture portions 10 and a plurality of second texture portions 20, wherein the plurality of first texture portions 10 and the plurality of second texture portions 20 are partially alternately arranged, and the first texture portions 10 and the second texture portions 20 are both flow texture portions. When the decorative film 100 is in a first environment, the first texture portion 10 has a first color, and the plurality of first texture portions 10 cooperate with the plurality of second texture portions 20 to make the decorative film 100 present a first pattern. When the decorative film 100 is in a second environment, the first texture portion 10 has a second color, and the plurality of first texture portions 10 cooperate with the plurality of second texture portions 20 to make the decorative film 100 present a second pattern, and the second texture portion 20 has a third color, wherein the first color is different from the second color. Thus, the decorative film 100 can present different colors and patterns in different environments. When applied to electronic devices, the electronic devices can have a better appearance, increase the interaction between the electronic devices and users, and improve the playability of the electronic devices. In addition, the multiple first texture portions 10 and the multiple second texture portions 20 are partially alternately arranged, and the first texture portions 10 and the second texture portions 20 are both flow texture portions. By designing the colors and flow textures of the first texture portions 10 and the second texture portions 20, the decorative film 100 can present the effects of a variety of color combinations and flow texture combinations, thereby improving the designability of the decorative film 100 and better meeting the needs of users.

[0073] In some embodiments, the first environment is a first temperature, and the second environment is a second temperature. When the decorative film 100 is at the first temperature, the first texture portion 10 has a first color, and the plurality of first texture portions 10 cooperate with the plurality of second texture portions 20 to make the decorative film 100 present a first pattern. When the decorative film 100 is at the second temperature, the first texture portion 10 has a second color, and the plurality of first texture portions 10 cooperate with the plurality of second texture portions 20 to make the decorative film 100 present a second pattern, wherein the first temperature is greater than the second temperature.

[0074] It is understandable that the first texture portion 10 can change color with temperature. In other words, the first texture portion 10 has different colors when it is at different temperatures. It is also understandable that the first texture portion 10 is a thermochromic texture portion.

[0075] For example, when the decorative film 100 is at 0°C, the first texture portion 10 is white, and when the decorative film 100 is at 30°C, the first texture portion 10 is blue. Thus, the color of the first texture portion 10 of the decorative film 100 can be switched between white and blue as the ambient temperature changes, thereby achieving color change to avoid visual fatigue of users who look at one color for a long time.

[0076] For another example, when the temperature difference between day and night is relatively large, the first texture portion 10 of the decorative film 100 presents a first color when the temperature is low at night, and presents a second color when the temperature is high during the day, so that users can experience different appearance and functional effects during the day and at night.

[0077] For another example, in winter when the temperature is low, the first texture portion 10 presents a first color, and in summer when the temperature is high, the first texture portion 10 presents a second color.

[0078] In this embodiment, when the decorative film 100 is at a first temperature, the first texture portion 10 has a first color, and the plurality of first texture portions 10 cooperate with the plurality of second texture portions 20 to make the decorative film 100 present a first pattern. When the decorative film 100 is at a second temperature, the first texture portion 10 has a second color, and the plurality of first texture portions 10 cooperate with the plurality of second texture portions 20 to make the decorative film 100 present a second pattern, wherein the first temperature is greater than the second temperature. Thus, the decorative film 100 can present different colors and patterns at different temperatures. When applied to electronic devices, the electronic devices can have a better appearance, increase the interaction between the electronic devices and users, and improve the playability of the electronic devices.

[0079] In other embodiments, the first environment is irradiated by light of the first band, and the second environment is irradiated by light of the second band. When the decorative film 100 is irradiated by light of the first band, the first texture portion 10 has a first color, and the multiple first texture portions 10 cooperate with the multiple second texture portions 20 to make the decorative film 100 present a first pattern. When the decorative film 100 is irradiated by light of the second band, the first texture portion 10 has a second color, and the multiple first texture portions 10 cooperate with the multiple second texture portions 20 to make the decorative film 100 present a second pattern.

[0080] Optionally, the first wavelength band light may be, but is not limited to, non-ultraviolet light, such as a light environment with a wavelength greater than 400 nm, such as an indoor environment without ultraviolet light.

[0081] Optionally, the second wavelength band light may be but is not limited to at least one of sunlight, ultraviolet light, and the like.

[0082] Optionally, the first texture portion 10 is a photochromic texture portion, and a conductive layer (such as an indium tin oxide layer, ITO for short) can be respectively provided on two opposite surfaces of the decorative film 100, so that the first band light or the second band light is loaded through the conductive layers on the two opposite surfaces of the decorative film 100.

[0083] In a specific example, when the decorative film 100 is indoors, the first texture portion 10 has a first color, and the multiple first texture portions 10 cooperate with the multiple second texture portions 20 to make the decorative film 100 present a first pattern; when the decorative film 100 is under sunlight or ultraviolet light, the first texture portion 10 has a second color, and the multiple first texture portions 10 cooperate with the multiple second texture portions 20 to make the decorative film 100 present a second pattern.

[0084] In this embodiment, the first environment is a light of the first wavelength band, and the second environment is a light of the second wavelength band. When the decorative film 100 is illuminated by the light of the first wavelength band, the first texture portion 10 has a first color, and the plurality of first texture portions 10 cooperate with the plurality of second texture portions 20 to make the decorative film 100 present a first pattern. When the decorative film 100 is illuminated by the light of the second wavelength band, the first texture portion 10 has a second color, and the plurality of first texture portions 10 cooperate with the plurality of second texture portions 20 to make the decorative film 100 present a second pattern. Thus, the decorative film 100 can present different colors and patterns when illuminated by light of different wavelength bands. When applied to electronic devices, the electronic devices can have a better appearance, increase the interaction between the electronic devices and users, and improve the playability of the electronic devices.

[0085] In some other embodiments, the first environment is a first brightness, and the second environment is a second brightness. When the decorative film 100 is at the first brightness, the first texture portion 10 has a first color, and the multiple first texture portions 10 cooperate with the multiple second texture portions 20 to make the decorative film 100 present a first pattern. When the decorative film 100 is loaded with a second brightness, the first texture portion 10 has a second color and can emit light, and the multiple first texture portions 10 cooperate with the multiple second texture portions 20 to make the decorative film 100 present a second pattern, wherein the first brightness is greater than the second brightness.

[0086] It should be noted that when the decorative film 100 is at the first brightness, the first texture portion 10 can absorb light, and when the decorative film 100 is at the second brightness, the first texture portion 10 can emit light.

[0087] Optionally, the first texture portion 10 is a luminous texture portion or a fluorescent texture portion.

[0088] For example, when there is sufficient light during the day, the first texture portion 10 of the decorative film 100 can absorb light to present a first color; at night, the first texture portion 10 can emit light to present a second color.

[0089] In this embodiment, the first environment is the first brightness, and the second environment is the second brightness. When the decorative film 100 is in the first brightness, the first texture part 10 has a first color, and the plurality of first texture parts 10 cooperate with the plurality of second texture parts 20 to make the decorative film 100 present a first pattern. When the decorative film 100 is loaded with the second brightness, the first texture part 10 has a second color and can emit light, and the plurality of first texture parts 10 cooperate with the plurality of second texture parts 20 to make the decorative film 100 present a second pattern, wherein the first brightness is greater than the second brightness. Thus, the decorative film 100 can present different colors and patterns in environments with different brightness. When applied to electronic devices, the electronic devices can have a better appearance, increase the interaction between the electronic devices and users, and improve the playability of the electronic devices.

[0090] In some embodiments, the first texture portion 10 includes a first polymer matrix and a first decorative powder, the first decorative powder is dispersed in the first polymer matrix, and the mass fraction of the first decorative powder in the first texture portion 10 ranges from 3 wt % to 30 wt %.

[0091] In the embodiments of the present application, when a numerical value range from a to b is involved, unless otherwise specified, it means that the numerical value can be any numerical value between a and b, including the endpoint numerical value a and the endpoint numerical value b.

[0092] Optionally, when the decorative film 100 is applied to a back cover of a mobile phone, the back cover of the mobile phone has the effect of 500 million thermochromic powders.

[0093] Specifically, the mass fraction of the first decorative powder in the first texture portion 10 can be but is not limited to 3wt%, 4wt%, 5wt%, 6wt%, 8wt%, 10wt%, 13wt%, 15wt%, 18wt%, 20wt%, 22wt%, 23wt%, 25wt%, 28wt%, 30wt%, etc.

[0094] In this embodiment, if the mass fraction of the first decorative powder in the first texture portion 10 is too low, the color of the first texture portion 10 does not change obviously with the environment (temperature, wavelength light or brightness), thereby reducing the color changing effect of the first texture portion 10; if the mass fraction of the first decorative powder in the first texture portion 10 is too high, the color of the first texture portion 10 is too dark, thereby reducing the appearance effect of the decorative film 100.

[0095] Furthermore, the mass fraction of the first decorative powder in the first texture portion 10 is in a range of 3wt% to 10wt%, so that the first texture portion 10 and the decorative film 100 can have a better color changing effect and a better appearance.

[0096] In some embodiments, the first polymer matrix includes at least one of cellulose acetate (also known as celluloid) and thermoplastic polyurethane, and the first decorative powder includes at least one of thermochromic powder, photochromic powder, fluorescent powder, luminous powder, and phosphorescent powder.

[0097] In this embodiment, cellulose acetate and thermoplastic polyurethane are semi-permeable or permeable. Using these two polymers as the matrix can make the color change of the first decorative powder better presented. Thermochromic powder, photochromic powder, fluorescent powder, luminous powder, phosphorescent powder can make the first texture part 10 change color under certain conditions, thereby achieving the change of color or pattern of the decorative film 100, so that the decorative film 100 has a better appearance and better playability.

[0098] Optionally, the photochromic powder may be, but is not limited to, at least one of a pigment-type photochromic powder and a dye-type photochromic powder.

[0099] Optionally, the photochromic powder presents a first color when in an environment without ultraviolet light, and when in an environment with ultraviolet light, such as sunlight / ultraviolet light, it absorbs the energy of sunlight / ultraviolet light, causing a change in the molecular structure, breaking the cyclic ether bond to generate a quinone structure, resulting in a change in the absorption wavelength, and thus producing a color change; when the energy of sunlight / ultraviolet light is lost, the original molecular cyclic ether structure is restored to the original color.

[0100] See also Figure 2 In some embodiments, the first decorative powder is a thermochromic powder 11 , and the thermochromic powder 11 includes a color-changing core 111 and a shell 112 , and the shell 112 is wrapped around the surface of the color-changing core 111 .

[0101] It can be understood that the thermochromic powder 11 is a core-shell structure.

[0102] It should be noted that the color-changing core 111 is enclosed in the shell 112 , that is, enclosed in a closed space enclosed by the shell 112 .

[0103] In this embodiment, by adopting a core-shell structure, the color-changing core 111 is enclosed in the outer shell 112, which can better prevent water and oxygen from entering the color-changing core 111, and can make the thermochromic powder 11 have better temperature stability, weather resistance and durability, so that it is not easy to fail even after a longer period of use.

[0104] Optionally, the color changing temperature of the thermochromic powder 11 ranges from -20°C to 60°C.

[0105] Optionally, the first temperature is greater than the color change temperature, and the second temperature is less than the color change temperature.

[0106] Specifically, the color changing temperature of the thermochromic powder 11 can be but is not limited to -20°C, -15°C, -10°C, -5°C, 0°C, 5°C, 10°C, 15°C, 20°C, 25°C, 30°C, 35°C, 40°C, 45°C, 50°C, 55°C, 60°C, etc.

[0107] In this embodiment, if the color changing temperature of the thermochromic powder 11 is too low or too high, it will exceed the temperature of the use environment of the electronic device used by the decorative film 100, so that the first texture portion 10 and the decorative film 100 will not change color, and the color changing function of the first texture portion 10 cannot be used.

[0108] Furthermore, the color change temperature of the thermochromic powder 11 ranges from 10° C. to 30° C. In this way, the color change temperature of the first texture portion 10 is preferably in the middle value of the ambient temperature of daily electronic equipment, so that when the ambient temperature changes, the first texture portion 10 can better change color with the change of the ambient temperature.

[0109] In a specific embodiment, the color change temperature of the thermochromic powder 11 is 22° C. When the decorative film 100 is in an environment greater than or equal to 22° C., the thermochromic powder 11 is colorless and transparent, and the first texture portion 10 is white; when the decorative film 100 is in an environment less than 22° C., the thermochromic powder 11 is blue, and the first texture portion 10 is blue.

[0110] Optionally, the color-changing core 111 includes a color-changing dye, a developer and a first solvent, and the melting point of the first solvent ranges from -20°C to 60°C.

[0111] The color changing principle of the thermochromic powder 11 is as follows: under high temperature conditions, the color-changing dye and the developer are dissolved and dispersed in the first solvent, and the thermochromic powder 11 appears colorless or white. When the temperature decreases, the first solvent gradually solidifies and becomes solid, and the color-changing dye and the developer are close to each other. Under the action of the developer, the color-changing dye undergoes structural changes, so that the system shows color (for example, blue). The color-changing dye is an electron transfer type organic compound, which is a type of organic color-producing system with a special chemical structure. At a specific temperature, the molecular structure of the organic matter changes due to electron transfer, thereby achieving color change. The developer is an electron acceptor and provides protons. By regulating the solidification temperature (i.e., melting point) of the first solvent, the color change temperature of the thermochromic powder 11 can be controlled, thereby preparing a temperature-changing product that changes color at different temperatures.

[0112] It can be understood that the color change process of the thermochromic powder 11 is a physical process of melting and crystallization of the first solvent. Therefore, the melting temperature of the first solvent determines the color change temperature of the thermochromic powder 11.

[0113] Optionally, the color-changing dye may be, but is not limited to, a fluorane compound. Optionally, the fluorane compound may include, but is not limited to, crystal violet lactone (3,3-bis(4-dimethylaminophenyl)-6-dimethylaminophenyl peptide, abbreviated as CVL).

[0114] Optionally, the mass fraction of the color-changing dye in the thermochromic powder 11 ranges from 1% to 10%. Specifically, the mass fraction of the color-changing dye in the thermochromic powder 11 may be, but is not limited to, 1%, 2%, 4%, 6%, 8%, 10%, etc. If the mass fraction of the color-changing dye in the thermochromic powder 11 is too low, the color of the first texture portion 10 is lighter when the color changes, and the color-changing effect becomes worse; if the mass fraction of the color-changing dye in the thermochromic powder 11 is too high, the color-changing dye is difficult to completely dissolve in the first solvent, and is prone to precipitation, interfering with the crystallinity in the color-changing core 111 system, so that the color-changing color and color-changing temperature of the first texture portion 10 lose accuracy.

[0115] Optionally, the developer may be, but is not limited to, a phenolic compound. Optionally, the phenolic compound may be, but is not limited to, bisphenol S.

[0116] Optionally, the mass fraction of the developer in the thermochromic powder 11 ranges from 1% to 10%. Specifically, the mass fraction of the developer in the thermochromic powder 11 may be, but is not limited to, 1%, 2%, 4%, 6%, 8%, 10%, etc. If the mass fraction of the developer in the thermochromic powder 11 is too low, the color of the first texture portion 10 will be lighter when the color changes, and the color change effect will be worse; if the mass fraction of the developer in the thermochromic powder 11 is too high, the developer will be difficult to completely dissolve in the first solvent, and will easily precipitate, interfering with the crystallinity in the color-changing core 111 system, so that the color change color and color change temperature of the first texture portion 10 lose accuracy.

[0117] Optionally, the first solvent may be, but is not limited to, a fatty acid compound. Specifically, the first solvent may be, but is not limited to, tetradecanoic acid, hexadecanoic acid, tetradecanol, hexadecanol.

[0118] Optionally, the mass fraction of the first solvent in the thermochromic powder 11 ranges from 30% to 70%. Specifically, the mass fraction of the first solvent in the thermochromic powder 11 may be, but is not limited to, 30%, 40%, 50%, 60%, 70%, etc. If the mass fraction of the first solvent in the thermochromic powder 11 is too low, the first solvent is insufficient to dissolve the color-changing dye and the developer, and it is difficult to achieve the purpose of color development by crystallizing the color-changing dye and the developer, and the color change will be slow and insensitive; if the mass fraction of the first solvent in the thermochromic powder 11 is too high, the crystallization speed of the color-changing core 111 of the thermochromic powder 11 is too slow, and the color change temperature of the thermochromic powder 11 is easy to be inaccurately controlled.

[0119] In some embodiments, the thermochromic powder 11 satisfies at least one of the following conditions:

[0120] The particle size of the thermochromic powder 11 is in the range of 3 μm to 10 μm; and

[0121] The thickness of the shell 112 ranges from 100 nm to 200 nm.

[0122] Optionally, the thermochromic powder 11 is a micron-sized particle. The particle size of the thermochromic powder 11 may be, but is not limited to, 3μm, 3.5μm, 4μm, 4.5μm, 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, etc. If the particle size of the thermochromic powder 11 is too small, the color change reaction speed of the thermochromic powder 11 is reduced, and the color change response speed of the decorative film 100 is reduced; in addition, the dispersibility of the thermochromic powder 11 in the first polymer matrix is ​​reduced, so that the thermochromic powder 11 is easy to agglomerate, and the appearance effect of the first texture part 10 and the decorative film 100 is reduced; if the particle size of the thermochromic powder 11 is too large, the rigidity of the shell 112 is reduced, so that the shell 112 is easy to break.

[0123] Furthermore, the particle size of the thermochromic powder 11 is in the range of 3 μm to 5 μm, so that the thermochromic powder 11 can have a faster color change reaction speed, better rigidity, and is less likely to break.

[0124] Optionally, the thickness of the shell 112 may be, but is not limited to, 100 nm, 110 nm, 120 nm, 130 nm, 140 nm, 150 nm, 160 nm, 170 nm, 180 nm, 190 nm, 200 nm, etc. If the thickness of the shell 112 is too thin, the pressure resistance of the shell 112 is reduced, so that the thermochromic powder 11 is easily broken during the preparation of the decorative film 100, thereby making the boundary between the first texture part 10 and the second texture part 20 unclear, affecting the appearance of the decorative film 100. In addition, after the thermochromic powder 11 is broken, the color changing function of the thermochromic powder 11 will be invalid; if the thickness of the shell 112 is too thick, the heat transfer of the thermochromic powder 11 will become slow, reducing the color changing effect and color development effect of the thermochromic powder 11.

[0125] Optionally, the material of the shell 112 may include but is not limited to at least one of thermosetting polymers including amino resin, epoxy resin (such as isobutyl phenoxy epoxy resin), polyurethane resin, etc. These resins have higher mechanical strength and better high pressure and high temperature resistance, and can better protect the color-changing core 111 and prevent external solvents from penetrating into the color-changing core 111.

[0126] When the material of the shell 112 is amino resin, the shell 112 has better high pressure resistance and high temperature resistance. The higher the cross-linking degree of the shell 112 is, the less likely it is that the external solvent will penetrate into the shell 112.

[0127] In some embodiments, the housing 112 satisfies at least one of the following conditions:

[0128] The thermal decomposition temperature of the shell 112 is greater than or equal to 240° C.; and

[0129] The pressure resistance value of the housing 112 is greater than or equal to 8.8 MPa.

[0130] Specifically, the thermal decomposition temperature of the shell 112 may be, but is not limited to, greater than or equal to 240°C, greater than or equal to 260°C, greater than or equal to 280°C, greater than or equal to 300°C, greater than or equal to 320°C, greater than or equal to 340°C, greater than or equal to 360°C, etc. If the thermal decomposition temperature of the shell 112 is too low, the shell 112 is easily decomposed during the process of preparing the decorative film 100 and attaching the decorative film 100 to the shell, thereby rendering the color changing function of the thermochromic powder 11 ineffective; the higher the thermal decomposition temperature of the shell 112, the better; however, if the thermal decomposition temperature of the shell 112 is too high, the material requirements are increased, thereby increasing the cost of the thermochromic powder 11.

[0131] Optionally, a thermal gravimetric analysis (TGA) method is used to perform heat resistance analysis on the thermochromic powder 11, and it can be known that when the temperature of the thermochromic powder 11 is greater than or equal to 250°C, the thermal weight loss is less than or equal to 5wt%.

[0132] Specifically, the pressure resistance value of the shell 112 is greater than or equal to 8.8 MPa. Specifically, the pressure resistance value of the shell 112 may be, but is not limited to, greater than or equal to 8.8 MPa, greater than or equal to 9 MPa, greater than or equal to 10 MPa, greater than or equal to 12 MPa, greater than or equal to 14 MPa, greater than or equal to 15 MPa, greater than or equal to 16 MPa, greater than or equal to 18 MPa, greater than or equal to 20 MPa, greater than or equal to 25 MPa, etc. If the pressure resistance value of the shell 112 is too small, the shell 112 is easily broken during the preparation process of the decorative film 100 and the decorative film 100 is applied to the shell, and the preparation process of the shell, so that the color changing function of the thermochromic powder 11 fails; the higher the pressure resistance value of the shell 112, the better, but the higher the pressure resistance value of the shell 112, the higher the material requirements, and the cost of the thermochromic powder 11.

[0133] In some embodiments, the second texture portion 20 includes a second polymer matrix and a second decorative powder, the second decorative powder is dispersed in the second polymer matrix, and the mass fraction of the second decorative powder in the second texture portion 20 ranges from 3 wt % to 30 wt %.

[0134] Specifically, the mass fraction of the second decorative powder in the second texture portion 20 can be but is not limited to 3wt%, 4wt%, 5wt%, 6wt%, 8wt%, 10wt%, 13wt%, 15wt%, 18wt%, 20wt%, 22wt%, 23wt%, 25wt%, 28wt%, 30wt%, etc.

[0135] In this embodiment, if the mass fraction of the second decorative powder in the second texture portion 20 is too low, the pearlescent or glittering effects of the second texture portion 20 are not obvious, thereby reducing the appearance of the second texture portion 20; if the mass fraction of the second decorative powder in the second texture portion 20 is too high, then the dispersion effect of the second decorative powder in the second texture portion 20 is reduced, thereby reducing the appearance of the decorative film 100.

[0136] Furthermore, the mass fraction of the second decorative powder in the second texture portion 20 is in a range of 3wt% to 10wt%, so that the second texture portion 20 and the decorative film 100 can have a better appearance.

[0137] In some embodiments, the second polymer matrix includes at least one of cellulose acetate and thermoplastic polyurethane, and the second decorative powder includes at least one of glitter powder and pearl powder.

[0138] In this embodiment, cellulose acetate and thermoplastic polyurethane are semi-permeable or transparent. Using these two polymers as the matrix can make the color change of the second decorative powder better presented. Glitter powder and pearl powder can make the second texture part 20 have pearlescent or glittering effects, so that the decorative film 100 has a better appearance.

[0139] Optionally, the material of the first polymer matrix and the material of the second polymer matrix can be the same or different. When the material of the first polymer matrix and the material of the second polymer matrix are the same, the preparation process of the decorative film 100 can be simplified, and the first texture part 10 and the second texture part 20 can have better bonding strength, thereby improving the mechanical properties of the decorative film 100.

[0140] Optionally, the thickness of the decorative film 100 ranges from 0.045 mm to 0.08 mm. Specifically, the thickness of the decorative film 100 may be, but is not limited to, 0.045 mm, 0.05 mm, 0.055 mm, 0.06 mm, 0.065 mm, 0.07 mm, 0.075 mm, 0.08 mm, etc. If the thickness of the decorative film 100 is too thin, the decorative film 100 is easily broken during the stretching process during preparation, which reduces the production yield of the decorative film 100. In addition, it is easy to make the first texture part 10 and the second texture part 20 too large in size, affecting the appearance of the decorative film 100. If the thickness of the decorative film 100 is too thick, the light transmittance and permeability of the decorative film 100 are reduced, making the decorative film 100 easy to turn yellow. When applied to a shell, the appearance of the shell is reduced. In addition, the thickness of the shell is too large, which is not conducive to the thinness of the shell.

[0141] The decorative film 100 of the embodiment of the present application can be prepared by the method described in the following embodiment of the present application. In addition, it can also be prepared by other methods. The preparation method of the embodiment of the present application is only one or more preparation methods of the decorative film 100 of the present application and should not be understood as a limitation on the decorative film 100 provided by the embodiment of the present application.

[0142] See also Figure 3 , the embodiment of the present application provides a method for preparing a decorative film 100, which includes:

[0143] S201, providing a first polymer powder and a first decorative powder, and forming the first polymer powder and the first decorative powder into a first sheet;

[0144] Optionally, the first polymer powder includes at least one of cellulose acetate powder and thermoplastic polyurethane powder.

[0145] S202, providing a second polymer powder and a second decorative powder, and forming the second polymer powder and the second decorative powder into a second sheet;

[0146] Optionally, the second polymer powder includes at least one of cellulose acetate powder and thermoplastic polyurethane powder.

[0147] S203, stacking the first sheet and the second sheet according to a preset rule, and extruding them to form a prefabricated strip;

[0148] S204, stacking a plurality of the prefabricated strips, pressing and slicing them to obtain an intermediate membrane sheet; and

[0149] S205 , stretching the intermediate film to obtain the decorative film 100 .

[0150] Among them, the decorative film 100 includes multiple first texture portions 10 and multiple second texture portions 20, the multiple first texture portions 10 and the multiple second texture portions 20 are partially alternately arranged, the first texture portions 10 and the second texture portions 20 are both curved, when the decorative film 100 is in a first environment, the first texture portion 10 has a first color, the multiple first texture portions 10 and the multiple second texture portions 20 cooperate to make the decorative film 100 present a first pattern, when the decorative film 100 is in a second environment, the first texture portion 10 has a second color, the multiple first texture portions 10 and the multiple second texture portions 20 cooperate to make the decorative film 100 present a second pattern, the second texture portion 20 has a third color, wherein the first color is different from the second color.

[0151] For detailed descriptions of other aspects of the decorative film 100, the first texture portion 10, the second texture portion 20, the first decorative powder, the second decorative powder, the first environment, the second environment, the first color, the second color and the third color, please refer to the description of the corresponding parts of the above embodiments and will not be repeated here.

[0152] The decorative film 100 prepared by the preparation method of the decorative film 100 of the embodiment of the present application comprises a plurality of first texture portions 10 and a plurality of second texture portions 20, wherein the plurality of first texture portions 10 and the plurality of second texture portions 20 are partially alternately arranged, and the first texture portions 10 and the second texture portions 20 are both curved. When the decorative film 100 is in a first environment, the first texture portion 10 has a first color, and the plurality of first texture portions 10 cooperate with the plurality of second texture portions 20 to make the decorative film 100 present a first pattern. When the decorative film 100 is in a second environment, the first texture portion 10 has a second color, and the plurality of first texture portions 10 cooperate with the plurality of second texture portions 20 to make the decorative film 100 present a second pattern, and the second texture portion 20 has a third color, wherein the first color is different from the second color. Thus, the decorative film 100 can present different colors and patterns in different environments, and when applied to electronic devices, the electronic devices can have a better appearance effect, increase the interaction between the electronic devices and users, and improve the playability of the electronic devices. In addition, the multiple first texture portions 10 and the multiple second texture portions 20 are partially alternately arranged, and the first texture portions 10 and the second texture portions 20 are both flow texture portions. By designing the colors and flow textures of the first texture portions 10 and the second texture portions 20, the decorative film 100 can present the effects of a variety of color combinations and flow texture combinations, thereby improving the designability of the decorative film 100 and better meeting the needs of users.

[0153] See also Figure 4 In some embodiments, in S201, providing a first polymer powder and a first decorative powder, and making the first polymer powder and the first decorative powder into a first sheet body includes:

[0154] S2011, providing a first polymer powder and a first decorative powder and mixing them evenly;

[0155] Optionally, the first polymer powder and the first decorative powder are mixed evenly in a mixer, for example, the mixing time is 120 seconds.

[0156] S2012, mixing the first polymer powder and the first decorative powder evenly stirred with the second solvent, and kneading them to form small lumps;

[0157] Optionally, the first polymer powder and the first decorative powder that are stirred evenly are placed in a kneading machine, and the second solvent is added to knead them into a mass (similar to dough), and the kneading time is 80 minutes to 100 minutes (for example, 80 minutes, 90 minutes, 100 minutes, etc.), and the mixture is left to stand for 6 hours to 10 hours (for example, 6 hours, 7 hours, 8 hours, 9 hours, 10 hours, etc.), so that the second solvent can fully dissolve the first polymer powder and the first decorative powder. The large mass is cut into small masses by a punching machine.

[0158] Optionally, the second solvent may be, but is not limited to, at least one of acetone, ethyl acetate, triacetic anhydride oil, ethyl lactate, and the like.

[0159] S2013, frying the plate to obtain a first sheet;

[0160] Optionally, the small lumps are fried in a frying machine and rolled into sheets with a roller to obtain a first sheet body.

[0161] Optionally, the thickness of the first sheet body ranges from 1 mm to 3 mm. Specifically, the thickness of the first sheet body can be, but is not limited to, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2.0 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, 3 mm, etc.

[0162] It can be understood that the first sheet is used to form the first texture portion 10 of the decorative film 100 , and the second sheet is used to form the second texture portion 20 of the decorative film 100 .

[0163] See also Figure 5 In some embodiments, in S202, providing a second polymer powder and a second decorative powder, and making the second polymer powder and the second decorative powder into a second sheet body includes:

[0164] S2021, providing a second polymer powder and a second decorative powder and mixing them uniformly;

[0165] Optionally, the second polymer powder and the second decorative powder are mixed evenly in a mixer, for example, the mixing time is 120 seconds.

[0166] S2022, mixing the evenly stirred second polymer powder and the second decorative powder with the third solvent, and kneading them to form small lumps;

[0167] Optionally, the stirred second polymer powder and the second decorative powder are placed in a kneading machine, and the third solvent is added to knead them into a mass (similar to dough), and the kneading time is 80 minutes to 100 minutes (for example, 80 minutes, 90 minutes, 100 minutes, etc.), and the mixture is left to stand for 6 hours to 10 hours (for example, 6 hours, 7 hours, 8 hours, 9 hours, 10 hours, etc.), so that the third solvent can fully dissolve the second polymer powder and the second decorative powder. The large mass is cut into small masses by a punching machine.

[0168] Optionally, the third solvent may be, but is not limited to, at least one of acetone, ethyl acetate, triacetic anhydride oil, ethyl lactate, and the like.

[0169] Optionally, the second solvent and the third solvent may be the same or different. When the second solvent and the third solvent are the same, the preparation process of the decorative film 100 may be simplified and the preparation cost of the decorative film 100 may be reduced.

[0170] S2023, frying the plate to obtain a second sheet;

[0171] Optionally, the small lumps are fried in a frying machine and rolled into sheets with a roller to obtain a second sheet body.

[0172] Optionally, the thickness of the second sheet body ranges from 1 mm to 3 mm. Specifically, the thickness of the second sheet body can be, but is not limited to, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2.0 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, 3 mm, etc.

[0173] Optionally, the thickness of the first sheet body and the thickness of the second sheet body may be the same or different, and may be specifically designed according to the line width or thickness of the first texture portion 10 and the second texture portion 20 .

[0174] It can be understood that the first sheet is used to form the first texture portion 10 of the decorative film 100 , and the second sheet is used to form the second texture portion 20 of the decorative film 100 .

[0175] See also Figure 6 In some embodiments, in S203, the stacking of the first sheet and the second sheet according to a preset rule and extrusion to form a prefabricated strip includes:

[0176] S2031, stacking the first sheet and the second sheet according to a preset rule to obtain a stacked component;

[0177] Optionally, the first sheet and the second sheet are stacked according to a preset rule to obtain a stacked component. For example, the first sheet is stacked alternately in sequence, or one layer of the first sheet and every two layers of the second sheet are stacked alternately in sequence. For another example, when the second sheet includes two different colors, such as white and blue, the blue second sheet, the first sheet, and the white second sheet are stacked alternately in sequence.

[0178] S2032, winding the stacked member to form a column;

[0179] Optionally, the laminate is wound into a cylindrical shape, placed in a shaping barrel for shaping, and allowed to stand to obtain a column.

[0180] Optionally, the diameter of the calibrating barrel is equal to the diameter of the extruder.

[0181] S2033, extruding the column to obtain an extruded strip; and

[0182] Optionally, the cylinder is placed in an extruder for extrusion into a rectangular parallelepiped shape, and is cut with a cutter to obtain an extruded strip.

[0183] Optionally, the length of the extruded strip can be designed according to actual needs.

[0184] In a specific embodiment, the dimensions of the extruded strip are: 400 mm in length, 30 mm in width, and 7.5 mm in thickness.

[0185] S2034, twisting the extruded strip to form a prefabricated strip, wherein the prefabricated strip is in a spiral shape.

[0186] Optionally, the extruded strip is twisted into a shape similar to a twist, and dried in a frame or in a drying room until the moisture content of the extruded strip is 17±2%, thereby obtaining a prefabricated strip in a spiral or twist shape.

[0187] See also Figure 7 In some embodiments, in S204, the plurality of prefabricated strips are stacked, pressed and flaked to obtain an intermediate film, including:

[0188] S2041, stacking a plurality of the prefabricated strips, wherein the stacking direction of the prefabricated strips is perpendicular to the extending direction of the prefabricated strips, to obtain a stacked body;

[0189] Optionally, a plurality of the prefabricated strips are stacked in a mold of a plate press to form a stack.

[0190] S2042, pressing the stacked body at a temperature ranging from 90° C. to 108° C. and a pressure ranging from 10 MPa to 20 MPa to obtain a pressed block; and

[0191] Specifically, the temperature of the pressing plate may be, but is not limited to, 90°C, 92°C, 94°C, 96°C, 98°C, 100°C, 102°C, 104°C, 106°C, 108°C, etc. If the temperature of the pressing plate is too low, the bonding performance between the prefabricated strips is poor during the pressing process, which reduces the preparation yield and mechanical properties of the decorative film 100; if the temperature of the pressing plate is too high, the prefabricated strips are too fused, which weakens the boundary between the first texture portion 10 and the second texture portion 20, and reduces the appearance of the decorative film 100.

[0192] Specifically, the pressure of the pressing plate is 10MPa, 11MPa, 12MPa, 13MPa, 14MPa, 15MPa, 16MPa, 17MPa, 18MPa, 19MPa, 20MPa, etc. If the pressure of the pressing plate is too small, the prefabricated strips are not pressed together firmly, bubbles are likely to exist, and the appearance of the decorative film 100 is reduced; if the pressure of the pressing plate is too large, the prefabricated strips are too fused together, so that the boundary between the first texture part 10 and the second texture part 20 becomes weak, and the appearance of the decorative film 100 is reduced; in addition, the first decorative powder is easily crushed, affecting the color change function of the first texture part 10.

[0193] Optionally, the time of holding the plate during pressing ranges from 5h to 8h. Specifically, the time of holding the plate during pressing can be, but is not limited to, 5h, 5.5h, 6h, 6.5h, 7h, 7.5h, 8h, etc.

[0194] Optionally, the pressing plate is cooled for 3 to 5 hours (such as 3 hours, 4 hours, 5 hours) to obtain a tofu-like block.

[0195] S2043, slicing and baking the pressed block to obtain an intermediate film.

[0196] Optionally, the pressed block is placed in a flaking machine for flaking; placed to dry for 10 h to 14 h (e.g., 10 h, 12 h, 14 h, etc.) to allow a portion of the solvent (i.e., the second solvent and the third solvent) to evaporate naturally; baked at a temperature of 80°C to 90°C (e.g., 80°C, 83°C, 85°C, 88°C, 90°C, etc.) for 6 h to 8 h (e.g., 6 h, 7 h, 8 h, etc.) to allow the solvent (i.e., the second solvent and the third solvent) and water (the first polymer and the second polymer are easily absorbent) to completely evaporate; a flattening machine is used to flatten the deformed membrane to obtain an intermediate membrane.

[0197] Optionally, the thickness of the intermediate film is in the range of 0.15mm to 0.3mm. Specifically, the thickness of the intermediate film may be, but is not limited to, 0.15mm, 0.18mm, 0.20mm, 0.23mm, 0.25mm, 0.28mm, 0.3mm, etc. If the thickness of the intermediate film is too thin, higher requirements are placed on the flaking technology, which increases the preparation cost of the decorative film 100; if the thickness of the intermediate film is too thick, the stretching ratio needs to be increased, making the intermediate film easy to break after stretching, reducing the preparation yield of the decorative film 100, or the prepared decorative film 100 is relatively thick, which is not conducive to the thinness of the shell when applied to the shell.

[0198] See also Figure 8 In some embodiments, in S205, the intermediate film is stretched to obtain the decorative film 100; comprising:

[0199] S2051, stretching the intermediate film along a first direction at a temperature of 140° C. to 180° C.; and

[0200] Optionally, the intermediate film is placed at a temperature of 140° C. to 180° C. and stretched along a first direction (eg, transverse direction).

[0201] Specifically, the temperature for stretching along the first direction may be, but is not limited to, 140°C, 145°C, 150°C, 155°C, 160°C, 165°C, 170°C, 175°C, 180°C, etc. If the temperature for stretching along the first direction is too low, the intermediate film cannot be stretched; if the temperature for stretching along the first direction is too high, the first polymer and the second polymer are easily melted, the intermediate film is easily broken, or wrinkled, and the production yield of the decorative film 100 is reduced.

[0202] Optionally, the stretching ratio of the intermediate film along the first direction ranges from 1.3 to 2.5, that is, the length after stretching is 1.3 to 2.5 times the original length. Specifically, the stretching ratio of the intermediate film along the first direction can be, but is not limited to, 1.3, 1.5, 1.8, 2.0, 2.3, 2.5, etc. If the stretching ratio of the intermediate film along the first direction is too small, the utilization rate of the product is reduced, the cost is increased, and the obtained decorative film 100 is too thick, which reduces the permeability of the decorative film 100; if the stretching ratio of the intermediate film along the first direction is too large, the intermediate film is easy to break, and the first texture portion 10 and the second texture portion 20 formed are easy to deform, which reduces the appearance effect of the decorative film 100. The stretching ratio of the intermediate film can be adjusted according to the designed dimensions of the first texture portion 10 and the second texture portion 20 in the decorative film 100.

[0203] S2052 , stretching along a second direction at a temperature of 140° C. to 180° C. to obtain the decorative film 100 , wherein the first direction intersects with the second direction.

[0204] Optionally, the intermediate film is stretched along a second direction (eg, longitudinal direction) at a temperature of 140° C. to 180° C. After the transverse and longitudinal stretching, the decorative film 100 is cut and fully inspected and packaged.

[0205] In some embodiments, the first direction is perpendicular to the second direction.

[0206] Specifically, the temperature for stretching along the second direction may be, but is not limited to, 140°C, 145°C, 150°C, 155°C, 160°C, 165°C, 170°C, 175°C, 180°C, etc. If the temperature for stretching along the second direction is too low, the intermediate film cannot be stretched open; if the temperature for stretching along the second direction is too high, the first polymer and the second polymer are easily melted, the intermediate film is easily broken, or wrinkled, and the production yield of the decorative film 100 is reduced.

[0207] Optionally, the stretching ratio of the intermediate film along the second direction ranges from 1.3 to 2.5, that is, the length after stretching is 1.3 to 2.5 times the original length. Specifically, the stretching ratio of the intermediate film along the second direction can be, but is not limited to, 1.3, 1.5, 1.8, 2.0, 2.3, 2.5, etc. If the stretching ratio of the intermediate film along the second direction is too small, the utilization rate of the product is reduced, the cost is increased, and the obtained decorative film 100 is too thick, which reduces the permeability of the decorative film 100; if the stretching ratio of the intermediate film along the second direction is too large, the intermediate film is easy to break, and the first texture portion 10 and the second texture portion 20 formed are easy to deform, which reduces the appearance effect of the decorative film 100. The stretching ratio of the intermediate film can be adjusted according to the designed dimensions of the first texture portion 10 and the second texture portion 20 in the decorative film 100.

[0208] The decorative film 100 of the present application is further described below through specific embodiments.

[0209] Example 1

[0210] The decorative film 100 of this embodiment is prepared by the following steps:

[0211] (1) Weigh 50 g of thermochromic blue powder (first decorative powder, thermochromic powder 11, color change temperature is 22° C., transparent and colorless when the temperature is higher than 22° C., and blue when the temperature is lower than 22° C.) and 1 kg of cellulose acetate powder (first polymer powder), stir evenly, add 0.45 kg of acetone, 0.18 kg of ethyl acetate, 0.16 kg of triacetic anhydride oil and 0.025 kg of ethyl lactate; knead and cut into small pieces, and fry on a plate to obtain a first sheet (white) with a thickness of 0.2 mm;

[0212] (2) Weigh 50 g of white pearl powder (second decorative powder) and 1 kg of cellulose acetate powder (second polymer powder), stir evenly, add 0.45 kg of acetone, 0.18 kg of ethyl acetate, 0.16 kg of triacetic anhydride oil and 0.025 kg of ethyl lactate; knead and cut into small pieces, and stir on a plate to obtain a white second sheet with a thickness of 0.2 mm; weigh 60 g of yellow pearl powder (second decorative powder) and 1 kg of cellulose acetate powder (second polymer powder), stir evenly, add 0.45 kg of acetone, 0.18 kg of ethyl acetate, 0.16 kg of triacetic anhydride oil and 0.025 kg of ethyl lactate; knead and cut into small pieces, and stir on a plate to obtain a yellow second sheet with a thickness of 0.2 mm;

[0213] (3) stacking the white second sheet, the yellow second sheet, the white second sheet, the first sheet, and the white second sheet in this order to obtain a stacked piece;

[0214] (4) winding and shaping the laminate into a cylindrical body, and extruding the laminate in an extruder to obtain an extruded strip;

[0215] (5) twisting the extruded strip into a prefabricated strip similar to a twist or spiral shape;

[0216] (6) stacking a plurality of the prefabricated strips in a mold of a plate pressing machine to form a stack;

[0217] (7) Pressing the stacked body at a temperature of 98° C. and a pressure of 15 MPa for 6.5 h, and then cooling for 4 h to obtain a briquette;

[0218] (8) slicing, drying for 12 hours, boiling at 85° C. for 7 hours, and flattening with a flattening machine to obtain an intermediate film;

[0219] (9) The intermediate film is stretched in the transverse direction at a temperature of 160° C. until the transverse length is 1.8 times of the original length; and is stretched in the longitudinal direction at a temperature of 160° C. until the longitudinal length is 1.8 times of the original length, and is cut into a preset size to obtain a decorative film 100.

[0220] Example 2

[0221] The decorative film 100 of this embodiment is prepared by the following steps:

[0222] (1) Weigh 50 g of luminous powder (i.e., the first decorative powder, green luminous powder) and 1 kg of cellulose acetate powder (the first polymer powder), stir them evenly, add 0.45 kg of acetone, 0.18 kg of ethyl acetate, 0.16 kg of triacetic anhydride oil and 0.025 kg of ethyl lactate; knead and cut into small pieces, and fry them on a plate to obtain a first sheet with a thickness of 0.2 mm;

[0223] (2) Weigh 50 g of white pearl powder (second decorative powder) and 1 kg of cellulose acetate powder (second polymer powder), stir evenly, add 0.45 kg of acetone, 0.18 kg of ethyl acetate, 0.16 kg of triacetic anhydride oil and 0.025 kg of ethyl lactate; knead and cut into small pieces, and stir on a plate to obtain a white second sheet with a thickness of 0.2 mm; weigh 60 g of yellow pearl powder (second decorative powder) and 1 kg of cellulose acetate powder (second polymer powder), stir evenly, add 0.45 kg of acetone, 0.18 kg of ethyl acetate, 0.16 kg of triacetic anhydride oil and 0.025 kg of ethyl lactate; knead and cut into small pieces, and stir on a plate to obtain a yellow second sheet with a thickness of 0.2 mm;

[0224] (3) stacking the white second sheet, the yellow second sheet, the white second sheet, the first sheet, and the white second sheet in this order to obtain a stacked piece;

[0225] (4) winding and shaping the laminate into a cylindrical body, and extruding the laminate in an extruder to obtain an extruded strip;

[0226] (5) twisting the extruded strip into a prefabricated strip similar to a twist or spiral shape;

[0227] (6) stacking a plurality of the prefabricated strips in a mold of a plate pressing machine to form a stack;

[0228] (7) Pressing the stacked body at a temperature of 98° C. and a pressure of 15 MPa for 6.5 h, and then cooling for 4 h to obtain a briquette;

[0229] (8) slicing, drying for 12 hours, boiling at 85° C. for 7 hours, and flattening with a flattening machine to obtain an intermediate film;

[0230] (9) The intermediate film is stretched in the transverse direction at a temperature of 160° C. until the transverse length is 1.8 times of the original length; and is stretched in the longitudinal direction at a temperature of 160° C. until the longitudinal length is 1.8 times of the original length, and is cut into a preset size to obtain a decorative film 100.

[0231] Example 3

[0232] The decorative film 100 of this embodiment is prepared by the following steps:

[0233] (1) Weigh 100 g of photochromic powder (i.e., the first decorative powder, Guangzhou Shengse Technology Co., Ltd., model BDY-B66 Haitao Blue, colorless before light exposure, blue after ultraviolet light exposure) and 1 kg of cellulose acetate powder (the first polymer powder), stir evenly, add 0.45 kg of acetone, 0.18 kg of ethyl acetate, 0.16 kg of triacetic anhydride oil and 0.025 kg of ethyl lactate; knead and cut into small pieces, and fry on a plate to obtain a first sheet with a thickness of 0.2 mm;

[0234] (2) Weigh 50 g of white pearl powder (second decorative powder) and 1 kg of cellulose acetate powder (second polymer powder), stir evenly, add 0.45 kg of acetone, 0.18 kg of ethyl acetate, 0.16 kg of triacetic anhydride oil and 0.025 kg of ethyl lactate; knead and cut into small pieces, and stir on a plate to obtain a white second sheet with a thickness of 0.2 mm; weigh 60 g of yellow pearl powder (second decorative powder) and 1 kg of cellulose acetate powder (second polymer powder), stir evenly, add 0.45 kg of acetone, 0.18 kg of ethyl acetate, 0.16 kg of triacetic anhydride oil and 0.025 kg of ethyl lactate; knead and cut into small pieces, and stir on a plate to obtain a yellow second sheet with a thickness of 0.2 mm;

[0235] (3) stacking the white second sheet, the yellow second sheet, the white second sheet, the first sheet, and the white second sheet in this order to obtain a stacked piece;

[0236] (4) winding and shaping the laminate into a cylindrical body, and extruding the laminate in an extruder to obtain an extruded strip;

[0237] (5) twisting the extruded strip into a prefabricated strip similar to a twist or spiral shape;

[0238] (6) stacking a plurality of the prefabricated strips in a mold of a plate pressing machine to form a stack;

[0239] (7) Pressing the stacked body at a temperature of 98° C. and a pressure of 15 MPa for 6.5 h, and then cooling for 4 h to obtain a briquette;

[0240] (8) slicing, drying for 12 hours, boiling at 85° C. for 7 hours, and flattening with a flattening machine to obtain an intermediate film;

[0241] (9) The intermediate film is stretched in the transverse direction at a temperature of 160° C. until the transverse length is 1.8 times of the original length; and is stretched in the longitudinal direction at a temperature of 160° C. until the longitudinal length is 1.8 times of the original length, and is cut into a preset size to obtain a decorative film 100.

[0242] The decorative films 100 of various embodiments were subjected to various performance tests.

[0243] (1) Scanning electron microscope test (SEM): The temperature of the thermochromic blue powder of Example 1 was gradually reduced from above the color change temperature to below the color change temperature, and scanning electron microscope images of the thermochromic blue powder were taken at above the color change temperature, at the color change temperature, and below the color change temperature. The scanning electron microscope images of the thermochromic blue powder at each temperature are shown in FIG. Fig. 9 shown.

[0244] like Fig. 9 As shown in FIG. 1 , when the temperature of the thermochromic powder 11 is higher than the color change temperature (30° C.), Fig. 9 (a) and Fig. 9 As shown in (b), the first solvent of the color-changing core 111 of the thermochromic powder 11 dissolves the color-changing dye and the developer to form a colorless and transparent state, which looks white. As the temperature drops to 22°C, the first solvent begins to crystallize and become solid, just like water turning into ice. Fig. 9 Figure (c) and Fig. 9 In the middle (d) figure, the color-changing dye and the developer are close to each other. Under the action of the developer, the color-changing dye undergoes structural changes, thereby precipitating and gradually showing the color of the system. When the temperature continues to drop below 22°C, the first solvent in the shell 112 will completely crystallize into solid crystals, and the composite dye (the color-changing dye combined with the developer) will not be dissolved at all and precipitate out, so that the color will be fully displayed, as shown in FIG. Fig. 9 (e) and Fig. 9 As shown in (f).

[0245] (2) Color change test:

[0246] i) The decorative film 100 of Example 1 is placed in an environment with a temperature of 30° C. (ie, the first environment is the first temperature). The product picture of the decorative film 100 is as shown in FIG. Fig.10 The decorative film 100 of Example 1 is placed in an environment with a temperature of 15°C (ie, the second environment is the second temperature). The product picture of the decorative film 100 is as shown in FIG. Fig.11 shown.

[0247] Depend on Fig.10 It can be seen that the decorative film 100 includes a white first texture portion 10 , a yellow second texture portion 20 , and a white second texture portion 20 , and the white first texture portion 10 , the yellow second texture portion 20 , and the white second texture portion 20 are all in a flowing shape.

[0248] Depend on Fig.11 It can be seen that the decorative film 100 includes a blue first texture portion 10 , a yellow second texture portion 20 , and a white second texture portion 20 , and the blue first texture portion 10 , the yellow second texture portion 20 , and the white second texture portion 20 are all in a flowing shape.

[0249] ii) The decorative film 100 of Example 2 is placed in an environment with sufficient light (such as outdoors during the day, that is, the first environment is a first brightness environment). The product picture of the decorative film 100 is as follows: Fig.12 The decorative film 100 of Example 2 is placed in a dark environment (i.e., the second environment is the second brightness), and the product picture of the decorative film 100 is as shown in FIG. Fig.13 shown.

[0250] Depend on Fig.12 It can be seen that the decorative film 100 includes a first texture portion 10 , a yellow second texture portion 20 , and a white second texture portion 20 , and the first texture portion 10 , the yellow second texture portion 20 , and the white second texture portion 20 are all in a flowing shape.

[0251] Depend on Fig.13 It can be seen that the position of the decorative film 100 corresponding to the first texture portion 10 is green, the first texture portion 10 emits green light, and the position corresponding to the second texture portion 20 is dark.

[0252] iii) The decorative film 100 of Example 3 is placed indoors, and the product picture of the decorative film 100 is as shown in FIG. Fig.14 As shown, the portion corresponding to the first texture portion 10 is white (photochromic powder is colorless, and cellulose acetate is white). The decorative film 100 of Example 3 is irradiated under 380nm ultraviolet light. The product picture of the irradiated decorative film 100 is as shown in FIG. Fig.15 As shown by Fig.15 It can be seen that the portion of the decorative film 100 corresponding to the first texture portion 10 appears blue.

[0253] Depend on Fig.14 It can be seen that the decorative film 100 includes a white first texture portion 10 , a yellow second texture portion 20 , and a white second texture portion 20 , and the white first texture portion 10 , the yellow second texture portion 20 , and the white second texture portion 20 are all in a flowing shape.

[0254] Depend on Fig.15 It can be seen that the decorative film 100 includes a blue first texture portion 10 , a yellow second texture portion 20 , and a white second texture portion 20 , and the blue first texture portion 10 , the yellow second texture portion 20 , and the white second texture portion 20 are all in a flowing shape.

[0255] (3) Durability measurement of the thermochromic powder 11: The thermochromic powder 11 of Example 1 was repeatedly placed in ice water and 50°C water alternately. After testing, it was found that the thermochromic powder 11 still had the color changing function after 15,000 alternations.

[0256] (4) Preparation of color change verification in each process: The intermediate products of each stage, such as the first sheet obtained after kneading, the prefabricated strip after extrusion, the pressed block after the pressing plate, and the intermediate film, were subjected to temperature change tests, and none of them affected the color change effect of the thermochromic powder 11.

[0257] See also Fig.16 and Fig.17 The embodiment of the present application further provides a shell 300, which includes a first substrate layer 310, the decorative film 100 described in the embodiment of the present application, and a second substrate layer 320, wherein the decorative film 100 is arranged on one side of the first substrate layer 310; the second substrate layer 320 is arranged on the side of the decorative film 100 away from the first substrate layer 310.

[0258] The housing 300 of the embodiment of the present application can be applied to portable electronic devices such as mobile phones, tablet computers, laptop computers, desktop computers, smart bracelets, smart watches, e-readers, game consoles, etc. The housing 300 of the embodiment of the present application can be a 2D structure, a 2.5D structure, a 3D structure, etc. The housing 300 of the present application can be a middle frame, a battery back cover (battery cover), a decorative piece, etc. of an electronic device. In the following embodiments of the present application, the housing 300 is described in detail by taking the battery back cover of a mobile phone as an example.

[0259] It can be understood that the shell 300 described in this embodiment is only a form of the shell 300 used by the decorative film 100, and should not be understood as a limitation on the shell 300 provided in this application, nor should it be understood as a limitation on the decorative film 100 provided in each embodiment of this application.

[0260] It should be noted that, in the present application, “arranged on one side of a certain element” can mean arranged on the surface of the element; or arranged opposite to the element and spaced apart, with other elements arranged between the element.

[0261] The housing 300 of the embodiment of the present application includes a decorative film 100, which includes a plurality of first texture portions 10 and a plurality of second texture portions 20, wherein the plurality of first texture portions 10 and the plurality of second texture portions 20 are partially alternately arranged, and the first texture portion 10 and the second texture portion 20 are both flow texture portions. When the decorative film 100 is in a first environment, the first texture portion 10 has a first color, and the plurality of first texture portions 10 cooperate with the plurality of second texture portions 20 to make the decorative film 100 present a first pattern. When the decorative film 100 is in a second environment, the first texture portion 10 has a second color, and the plurality of first texture portions 10 cooperate with the plurality of second texture portions 20 to make the decorative film 100 present a second pattern, and the second texture portion 20 has a third color, wherein the first color is different from the second color. Thus, the decorative film 100 can present different colors and patterns in different environments. When applied to electronic devices, the electronic devices can have a better appearance, increase the interaction between the electronic devices and users, and improve the playability of the electronic devices. In addition, the multiple first texture portions 10 and the multiple second texture portions 20 are partially alternately arranged, and the first texture portions 10 and the second texture portions 20 are both flow texture portions. By designing the colors and flow textures of the first texture portions 10 and the second texture portions 20, the decorative film 100 can present the effects of a variety of color combinations and flow texture combinations, thereby improving the designability of the decorative film 100 and better meeting the needs of users.

[0262] Optionally, the first substrate layer 310 may be, but is not limited to, at least one of a polycarbonate substrate layer, a polymethyl methacrylate substrate layer (i.e., acrylic), a polyethylene terephthalate layer, a glass layer, a glass fiber layer, etc. In some embodiments, the first substrate layer 310 is a composite sheet of polycarbonate and polymethyl methacrylate. For example, the first substrate layer 310 includes a 0.33 mm polycarbonate layer and a 0.05 mm acrylic layer.

[0263] Optionally, the thickness of the first substrate layer 310 ranges from 0.05 mm to 0.45 mm. Specifically, the thickness of the first substrate layer 310 may be, but is not limited to, 0.05 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, etc. If the thickness of the first substrate layer 310 is too thin, the mechanical strength of the housing 300 is reduced; if the thickness of the first substrate layer 310 is too thick, it is not conducive to the thinness of the housing 300.

[0264] Optionally, the second substrate layer 320 may be at least one of, but not limited to, a polycarbonate substrate layer, a polymethyl methacrylate substrate layer, a polyethylene terephthalate layer, a glass layer, a glass fiber layer, and the like.

[0265] Optionally, the thickness of the second substrate layer 320 ranges from 0.05 mm to 0.45 mm. Specifically, the thickness of the second substrate layer 320 may be, but is not limited to, 0.05 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, etc. If the thickness of the second substrate layer 320 is too thin, the mechanical strength of the housing 300 is reduced; if the thickness of the second substrate layer 320 is too thick, it is not conducive to the thinness of the housing 300. In a specific embodiment, the second substrate layer 320 is a polycarbonate layer with a thickness of 0.1 mm.

[0266] Optionally, the housing 300 further includes a marking portion, such as a logo, which is disposed on a surface of the first substrate layer 310 facing the decorative film 100 .

[0267] See also Fig.18 Optionally, the shell 300 further includes a first adhesive layer 330 and a second adhesive layer 340, wherein the first adhesive layer 330 is disposed between the first substrate layer 310 and the decorative film 100, and is used to bond the first substrate layer 310 to the decorative film 100; the second adhesive layer 340 is disposed between the decorative film 100 and the second substrate layer 320, and is used to bond the decorative film 100 to the second substrate layer 320.

[0268] Optionally, the first adhesive layer 330 may be, but is not limited to, an optical UV adhesive layer (i.e., an optical ultraviolet curing layer). The thickness of the first adhesive layer 330 ranges from 25 μm to 35 μm. Specifically, the thickness of the first adhesive layer 330 may be, but is not limited to, 25 μm, 28 μm, 30 μm, 33 μm, 35 μm, etc.

[0269] Optionally, the second adhesive layer 340 may be, but is not limited to, an optical UV adhesive layer. The thickness of the second adhesive layer 340 ranges from 25 μm to 35 μm. Specifically, the thickness of the second adhesive layer 340 may be, but is not limited to, 25 μm, 28 μm, 30 μm, 33 μm, 35 μm, etc.

[0270] See also Fig.19 Optionally, the shell 300 further includes a hardening layer 350 and a cover bottom layer 360 , the hardening layer 350 is disposed on a surface of the first substrate layer 310 away from the second substrate layer 320 , and the cover bottom layer 360 is disposed on a surface of the second substrate layer 320 away from the first substrate layer 310 .

[0271] Optionally, the surface of the hardened layer 350 facing away from the first substrate layer 310 has a texture structure. Optionally, the hardened layer 350 is formed by curing a hardening liquid.

[0272] Optionally, the cover bottom layer 360 may be, but is not limited to, a light-shielding ink that absorbs or reflects light. Optionally, the cover bottom layer 360 may be black, white, or gray. The cover bottom layer 360 is used to prevent the hardening layer 350 side of the shell 300 from exposing the components inside the electronic device when the shell 300 is applied to the electronic device. Optionally, the cover bottom layer 360 may be a single layer or multiple layers, such as 2, 3, 4, 5, or 6 layers stacked. Optionally, the thickness of each layer of the cover bottom layer 360 is 9 μm to 11 μm, specifically, it may be, but is not limited to, 9 μm, 10 μm, 11 μm, etc.

[0273] The housing 300 of the present application can be prepared by the following steps:

[0274] (1) Silk-screening a logo on the surface of the first substrate layer 310;

[0275] (2) coating a first UV adhesive layer on the surface of the first substrate layer 310 having the logo, and attaching the decorative film 100 to the surface of the first UV adhesive layer, and curing the first UV adhesive layer with an LED lamp to obtain a first adhesive layer 330, wherein the energy of the LED curing is 2200±100 mj;

[0276] (3) providing a second substrate layer 320, coating a second UV adhesive layer on the surface of the second substrate layer 320 or the decorative film 100 away from the first substrate layer 310, and laminating the second substrate layer 320 to the decorative film 100 through the second UV adhesive layer, and curing the second UV adhesive layer with an LED lamp to obtain a second adhesive layer 340, wherein the energy of the LED curing is 2100 mj to 2300 mj;

[0277] (4) Curing is performed using a mercury lamp, the curing energy of which is 800mj to 900mj;

[0278] (5) using ink to screen print ink on the surface of the second substrate layer 320 away from the decorative film 100, and curing to form a cover bottom layer 360;

[0279] (6) coating a curing liquid on the surface of the first substrate layer 310 away from the decorative film 100, imprinting a texture structure, and curing the surface to form a hardened layer 350;

[0280] (7) Perform hot bending to obtain a shell 300 with a 3D structure; the temperature of the upper mold of the hot bending is 140° C., the temperature of the lower mold is 130° C., the pressure of the hot bending is in the range of 22 kg to 28 kg, the baking time is 40 s, and the holding time is 4 s to 10 s.

[0281] Optionally, the method further comprises CNC machining the housing 300 .

[0282] The product photo of the housing 300 of one embodiment of the present application when applied to a mobile phone is as follows Fig. 20 As shown. Among them, Fig. 20 (a) is a schematic diagram of the local structure of the mobile phone before it changes color (i.e. when the temperature is higher than the color change temperature). Fig. 20 (b) is a schematic diagram of the structure of the mobile phone after it changes color (i.e., when the temperature is lower than the color change temperature). Fig. 20 As shown in (a), before the color change, only the first pattern consisting of the white first texture part, the white second texture part and the golden second texture part can be seen; Fig. 20 As can be seen in (b), after the color change, a second pattern consisting of a blue first texture portion, a white second texture portion and a gold second texture portion can be seen.

[0283] See also Figure 21 to Figure 23 The embodiment of the present application further provides an electronic device 400, which includes a display screen 410, a housing 300 described in the embodiment of the present application, and a processor 430. The housing 300 and the display screen 410 are arranged opposite to each other; the processor 430 is located between the housing 300 and the display screen 410, and the processor 430 is electrically connected to the display screen 410 for controlling the display screen 410 to display.

[0284] The electronic device 400 of the embodiment of the present application may be, but is not limited to, a portable electronic device 400 such as a mobile phone, a tablet computer, a laptop computer, a desktop computer, a smart bracelet, a smart watch, an e-reader, a game console, etc.

[0285] For a detailed description of the housing 300 , please refer to the description of the corresponding part of the above embodiment, which will not be repeated here.

[0286] Optionally, the display screen 410 may be, but is not limited to, one or more of a liquid crystal display screen, a light emitting diode display screen (LED display screen), a micro light emitting diode display screen (Micro LED display screen), a sub-millimeter light emitting diode display screen (Mini LED display screen), an organic light emitting diode display screen (OLED display screen), etc.

[0287] Optionally, the processor 430 includes one or more general-purpose processors, wherein the general-purpose processor can be any type of device capable of processing electronic instructions, including a central processing unit (CPU), a microprocessor, a microcontroller, a main processor, a controller, and an ASIC, etc. The processor 430 is used to execute various types of digital storage instructions, such as software or firmware programs stored in a memory, which enables the computing device to provide a wide variety of services.

[0288] Optionally, the electronic device 400 of the present application further includes a memory 450. The memory 450 is electrically connected to the processor 430 and is used to store program codes required for the processor 430 to run, program codes required for controlling the display screen 410, display content of the display screen 410, and the like.

[0289] Optionally, the memory 450 may include a volatile memory (Volatile Memory), such as a random access memory (Random Access Memory, RAM); the memory 450 may also include a non-volatile memory (NVM), such as a read-only memory (Read-Only Memory, ROM), a flash memory (Flash Memory, FM), a hard disk drive (Hard Disk Drive, HDD) or a solid-state drive (SSD). The memory 450 may also include a combination of the above-mentioned types of memory.

[0290] In some embodiments, the electronic device 400 of the embodiment of the present application further includes a middle frame 420 and a camera module 470, wherein the middle frame 420 is disposed between the display screen 410 and the housing 300, and the side of the middle frame 420 is exposed to the housing 300 and the display screen 410. The middle frame 420 and the housing 300 enclose a housing space (not shown), and the housing space is used to accommodate the processor 430, the memory 450 and the camera module 470. The camera module 470 is electrically connected to the processor 430 for shooting under the control of the processor 430.

[0291] Optionally, the housing 300 has a light-transmitting portion 301, and the camera module 470 can shoot through the light-transmitting portion 301 on the housing 300, that is, the camera module 470 in this embodiment is a rear camera module 470. It can be understood that in other embodiments, the light-transmitting portion 301 can be set on the display screen 410, that is, the camera module 470 is a front camera module 470. In the schematic diagram of this embodiment, the light-transmitting portion 301 is illustrated as an opening. In other embodiments, the light-transmitting portion 301 may not be an opening, but a light-transmitting material, such as plastic, glass, etc.

[0292] It can be understood that the electronic device 400 described in this embodiment is merely a form of electronic device 400 used by the shell 300, and should not be understood as a limitation on the electronic device 400 provided in this application, nor should it be understood as a limitation on the shell 300 provided in each embodiment of this application.

[0293] Mentioning "embodiment" and "implementation method" in this application means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrases in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments. In addition, it should also be understood that the features, structures or characteristics described in the various embodiments of the present application can be arbitrarily combined to form another embodiment that does not deviate from the spirit and scope of the technical solution of the present application, if there is no contradiction between them.

[0294] Finally, it should be noted that the above implementation modes are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the above preferred implementation modes, a person of ordinary skill in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.

Claims

1. A decorative film, characterized in that: include: A plurality of first texture portions and a plurality of second texture portions, wherein the plurality of first texture portions and the plurality of second texture portions are partially alternately arranged, and the first texture portions and the second texture portions are both curved. When the decorative film is in a first environment, the first texture portion has a first color, and the plurality of first texture portions cooperate with the plurality of second texture portions to make the decorative film present a first pattern. When the decorative film is in a second environment, the first texture portion has a second color, and the plurality of first texture portions cooperate with the plurality of second texture portions to make the decorative film present a second pattern. The second texture portion has a third color, wherein the first color is different from the second color.

2. The decorative film according to claim 1, characterized in that: The first environment is a first temperature, and the second environment is a second temperature. When the decorative film is at the first temperature, the first texture portion has a first color, and the plurality of first texture portions cooperate with the plurality of second texture portions to make the decorative film present a first pattern. When the decorative film is at the second temperature, the first texture portion has a second color, and the plurality of first texture portions cooperate with the plurality of second texture portions to make the decorative film present a second pattern, wherein the first temperature is greater than the second temperature. and / or, The first environment is irradiated by light of a first wavelength band, and the second environment is irradiated by light of a second wavelength band. When the decorative film is irradiated by light of the first wavelength band, the first texture portion has a first color, and the plurality of first texture portions cooperate with the plurality of second texture portions to make the decorative film present a first pattern. When the decorative film is irradiated by light of the second wavelength band, the first texture portion has a second color, and the plurality of first texture portions cooperate with the plurality of second texture portions to make the decorative film present a second pattern. and / or, The first environment is a first brightness, and the second environment is a second brightness. When the decorative film is at the first brightness, the first texture portion has a first color, and the multiple first texture portions cooperate with the multiple second texture portions to make the decorative film present a first pattern. When the decorative film is loaded with a second brightness, the first texture portion has a second color and can emit light, and the multiple first texture portions cooperate with the multiple second texture portions to make the decorative film present a second pattern, wherein the first brightness is greater than the second brightness.

3. The decorative film according to claim 1, characterized in that: The first texture portion includes a first polymer matrix and a first decorative powder, the first decorative powder is dispersed in the first polymer matrix, and the mass fraction of the first decorative powder in the first texture portion ranges from 3wt% to 30wt%.

4. The decorative film according to claim 3, characterized in that: The first polymer matrix includes at least one of cellulose acetate and thermoplastic polyurethane, and the first decorative powder includes at least one of thermochromic powder, photochromic powder, fluorescent powder, luminous powder and phosphorescent powder.

5. The decorative film according to claim 3, characterized in that: The first decorative powder is a thermochromic powder, which includes a color-changing core and a shell. The shell is wrapped around the surface of the color-changing core. The color-changing temperature of the thermochromic powder ranges from -20°C to 60°C.

6. The decorative film according to claim 5, characterized in that: The thermochromic powder satisfies at least one of the following conditions: The particle size of the thermochromic powder ranges from 3 μm to 10 μm; and The thickness of the outer shell ranges from 100 nm to 200 nm.

7. The decorative film according to claim 5, characterized in that: The housing satisfies at least one of the following conditions: The thermal decomposition temperature of the shell is greater than or equal to 240°C; and The pressure resistance value of the shell is greater than or equal to 8.8 MPa.

8. The decorative film according to claim 1, characterized in that: The second texture portion includes a second polymer matrix and a second decorative powder, the second decorative powder is dispersed in the second polymer matrix, and the mass fraction of the second decorative powder in the second texture portion ranges from 3wt% to 30wt%.

9. The decorative film according to claim 8, characterized in that: The second polymer matrix includes at least one of cellulose acetate and thermoplastic polyurethane, and the second decorative powder includes at least one of glitter powder and pearl powder.

10. A method for preparing a decorative film, characterized in that: include: Providing a first polymer powder and a first decorative powder, and forming the first polymer powder and the first decorative powder into a first sheet; Providing a second polymer powder and a second decorative powder, and forming the second polymer powder and the second decorative powder into a second sheet; The first sheet and the second sheet are stacked according to a preset rule and extruded to form a prefabricated strip; stacking a plurality of the prefabricated strips, pressing and slicing them to obtain an intermediate membrane sheet; and stretching the intermediate film to obtain the decorative film; Among them, the decorative film includes a plurality of first texture portions and a plurality of second texture portions, the plurality of first texture portions and the plurality of second texture portions are partially alternately arranged, the first texture portion and the second texture portion are curved, when the decorative film is in a first environment, the first texture portion has a first color, the plurality of first texture portions cooperate with the plurality of second texture portions to make the decorative film present a first pattern, when the decorative film is in a second environment, the first texture portion has a second color, the plurality of first texture portions cooperate with the plurality of second texture portions to make the decorative film present a second pattern, the second texture portion has a third color, wherein the first color is different from the second color.

11. The method for preparing a decorative film according to claim 10, characterized in that: The first sheet and the second sheet are stacked according to a preset rule and extruded to form a prefabricated strip, comprising: The first sheet and the second sheet are stacked according to a preset rule to obtain a stacked component; Winding the stacked member to form a cylinder; Extruding the cylinder to obtain an extruded strip; and The extruded strip is twisted to form a prefabricated strip, and the prefabricated strip is in a spiral shape.

12. The method for preparing a decorative film according to claim 10, characterized in that: The method comprises stacking a plurality of the prefabricated strips, pressing and slicing the strips to obtain an intermediate film, including: stacking a plurality of the prefabricated strips, wherein the stacking direction of the prefabricated strips is perpendicular to the extending direction of the prefabricated strips, to obtain a stacked body; Pressing the stacked body at a temperature ranging from 90° C. to 108° C. and a pressure ranging from 10 MPa to 20 MPa to obtain a compact; and The pressed block is flaked and baked to obtain an intermediate film.

13. The method for preparing a decorative film according to any one of claims 10 to 12, characterized in that: The step of stretching the intermediate film to obtain the decorative film comprises: Stretching the intermediate film along a first direction at a temperature of 140° C. to 180° C.; and The decorative film is obtained by stretching the film along a second direction at a temperature of 140° C. to 180° C., wherein the first direction intersects with the second direction.

14. A housing, characterized in that: The housing comprises: a first substrate layer; The decorative film according to any one of claims 1 to 9 or the decorative film prepared by the method for preparing the decorative film according to any one of claims 1 to 13, wherein the decorative film is arranged on one side of the first substrate layer; and The second substrate layer is disposed on a side of the decorative film away from the first substrate layer.

15. An electronic device, characterized in that: include: Display screen; The housing as claimed in claim 14, wherein the housing is disposed opposite to the display screen; as well as A processor is located between the housing and the display screen, and the processor is electrically connected to the display screen to control the display screen to display.

Images