Iridescent housing, preparation method, iridescent pressure-sensitive tape and electronic device

Abstract

The present application provides a colorful housing, comprising: a substrate; and a pressure-sensitive adhesive film, the pressure-sensitive adhesive film being adhered to one surface of the substrate; wherein, a plurality of color-developing particles are dispersed in the pressure-sensitive adhesive film, the colors of the plurality of color-developing particles are different, and the plurality of color-developing particles are arranged in layers or zones in the pressure-sensitive adhesive film. Also provided are a preparation method of the colorful housing, a colorful pressure-sensitive adhesive tape, and an electronic device.

Description

Technical Field

[0001] The present application relates to the field of electronic technologies, and particularly relates to a colorful shell, a preparation method, a colorful pressure-sensitive tape, and an electronic device. Background Art

[0002] With the development of communication technologies, electronic devices such as mobile phones and tablet computers have become indispensable tools for people. When facing a dazzling array of electronic device products, consumers not only need to consider whether the functions of the products meet their own needs, but also the appearance of the products is one of the important factors that influence consumers' purchase decisions. However, with the iteration of electronic devices, the shapes of electronic devices of various brands have gradually become homogenized, and the appearance recognition is poor. Moreover, after the electronic devices leave the factory, their colors are usually fixed, which is likely to cause aesthetic fatigue over a long time. Therefore, there is an urgent need to develop an electronic device shell that can change colors to improve the product expressiveness of electronic devices. Summary of the Invention

[0003] In view of the above problems, the present application provides a colorful shell, a preparation method, a colorful pressure-sensitive tape, and an electronic device, which have a colorful appearance and thus have better product expressiveness.

[0004] The present application provides a colorful shell, including: a substrate; and a pressure-sensitive adhesive film, the pressure-sensitive adhesive film being attached to one surface of the substrate; wherein, a plurality of color-developing particles are dispersed in the pressure-sensitive adhesive film, the colors of the plurality of color-developing particles are different, and the plurality of color-developing particles are arranged in layers or zones in the pressure-sensitive adhesive film.

[0005] The present application also provides a preparation method of a colorful shell, including: providing a substrate; preparing a pressure-sensitive adhesive film; wherein, a plurality of color-developing particles are dispersed in the pressure-sensitive adhesive film, the colors of the plurality of color-developing particles are different, and the plurality of color-developing particles are arranged in layers or zones in the pressure-sensitive adhesive film; attaching the pressure-sensitive adhesive film to one surface of the substrate to obtain the colorful shell.

[0006] The present application also provides a colorful pressure-sensitive tape, including: a release paper; and a pressure-sensitive adhesive film formed on one surface of the release paper; wherein, a plurality of color-developing particles are dispersed in the pressure-sensitive adhesive film, the colors of the plurality of color-developing particles are different, and the plurality of color-developing particles are arranged in layers or zones in the pressure-sensitive adhesive film.

[0007] The present application also provides an electronic device, the electronic device including a display screen and the colorful shell as described above provided on the back of the display screen, or a colorful shell prepared by the preparation method of the colorful shell as described above, the colorful shell being provided with a receiving cavity, and a battery assembly being received in the receiving cavity.

[0008] In the iridescent housing, preparation method, pressure-sensitive adhesive tape and electronic device according to the embodiments of the present application, a plurality of color-developing particles are dispersed in the pressure-sensitive adhesive film. The colors of the plurality of color-developing particles are different, and the plurality of color-developing particles are arranged in layers or regions in the pressure-sensitive adhesive film. Therefore, when viewed from different angles, the pressure-sensitive adhesive film will present the colors of different color-developing particles, so that the housing can present an iridescent effect, which can enrich the appearance color pattern of the iridescent housing, and further improve the appearance expressiveness of the product. In addition, compared with the traditional process of forming a colored film layer on the surface of a substrate by coating, printing, etc., the pressure-sensitive adhesive film can be easily attached to the surface of the substrate, so the processing process is simpler. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0010] Figure 1 It is a schematic cross-sectional structure diagram of an iridescent housing provided by the first embodiment of the present application.

[0011] Figure 2 It is a schematic diagram of the arrangement of color-developing particles in the pressure-sensitive adhesive film of an iridescent housing provided by the first embodiment of the present application.

[0012] Figure 3 It is another schematic cross-sectional structure diagram of an iridescent housing provided by the first embodiment of the present application.

[0013] Figure 4 It is a schematic cross-sectional structure diagram of a pressure-sensitive adhesive film provided by the first embodiment of the present application.

[0014] Figure 5 It is still another schematic cross-sectional structure diagram of an iridescent housing provided by the first embodiment of the present application.

[0015] Figure 6 It is still another schematic cross-sectional structure diagram of an iridescent housing provided by the first embodiment of the present application.

[0016] Figure 7 It is still another schematic cross-sectional structure diagram of an iridescent housing provided by the first embodiment of the present application.

[0017] Figure 8 It is a schematic cross-sectional structure diagram of a substrate provided by the first embodiment of the present application.

[0018] Figure 9 It is a schematic flowchart of a preparation method of an iridescent housing provided by another embodiment of the present application.

[0019] Figure 10 It is a schematic flow chart of a method for preparing a pressure - sensitive adhesive film of a magic - color housing provided by another embodiment of the present application.

[0020] Figure 11 It is a schematic cross - sectional structure diagram of a magic - color pressure - sensitive tape provided by another embodiment of the present application.

[0021] Figure 12 It is a schematic cross - sectional structure diagram of a magic - color pressure - sensitive tape provided by another embodiment of the present application.

[0022] Figure 13 It is a schematic top - view structure diagram of an electronic device provided by another embodiment of the present application. Detailed implementation manners

[0023] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0024] The terms "including" and "having" in the description and claims of the present application and any variations thereof are intended to cover non - exclusive inclusion. 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 further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products or devices.

[0025] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings. It should be noted that, for the convenience of description, in the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, the detailed description of the same components is omitted in different embodiments.

[0026] An embodiment of the present application provides a magic - color housing, including a substrate; and a pressure - sensitive adhesive film, the pressure - sensitive adhesive film being attached to one side surface of the substrate; wherein, a plurality of color - showing particles are dispersed in the pressure - sensitive adhesive film, the colors of the plurality of color - showing particles are different, and the plurality of color - showing particles are arranged in layers or zones in the pressure - sensitive adhesive film.

[0027] The iridescent housing in the embodiments of the present application includes a substrate and a pressure-sensitive adhesive film. A variety of color-developing particles are dispersed in the pressure-sensitive adhesive film. The colors of the variety of color-developing particles are different, and the variety of color-developing particles are arranged in a scattered manner in the pressure-sensitive adhesive film. Thus, when viewed from different angles, the pressure-sensitive adhesive film will present the colors of different color-developing particles, so that the housing can present an iridescent effect, which can enrich the appearance color pattern of the iridescent housing, and further improve the appearance expressiveness of the product. In addition, compared with the traditional process of forming a colored film layer on the surface of the substrate by means of coating, printing, etc., the pressure-sensitive adhesive film can be easily attached to the surface of the substrate, so the processing process is simpler.

[0028] The iridescent housing of the present application can be, but is not limited to, the back cover, front cover, middle frame, camera decoration, etc. of an electronic device.

[0029] Please refer to Figure 1 , which is a schematic diagram of an iridescent housing 100 provided by the first embodiment of the present application. The iridescent housing 100 includes a substrate 11 and a pressure-sensitive adhesive film 12.

[0030] Among them, the substrate 11 can be a material with certain light-transmitting properties, preferably transparent or semi-transparent in texture; the light transmittance of the substrate 11 can be, but is not limited to, 85%, 88%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, etc.

[0031] In some embodiments, the material of the substrate 11 can be ceramic, resin, glass, etc.; among them, the resin can be, for example, polycarbonate (PC), polymethyl methacrylate (PMMA), PC / PMMA composite resin, etc.

[0032] The pressure-sensitive adhesive film 12 is attached to one side surface of the substrate 11; among them, a variety of color-developing particles are wrapped in the pressure-sensitive adhesive film 12. The colors of the variety of color-developing particles are different, and the variety of color-developing particles are arranged in layers or regions in the pressure-sensitive adhesive film 12; thus, some color-developing particles may be seen from one angle, and some other color-developing particles may be seen from another angle, and thus a change in color is visually perceived.

[0033] In some embodiments, the color-developing particles are organic color-developing particles, metal particles or metal oxide particles.

[0034] In some embodiments, preferably the color-developing particles are metal particles or metal oxide particles; the metal particles or metal oxide particles can be selected from the following materials: one or several of copper oxide, titanium dioxide, tin oxide, aluminum powder, lithium oxide, tungsten oxide, niobium oxide, molybdenum oxide, chromium oxide, manganese oxide, vanadium oxide, nickel oxide, zirconium oxide, iridium oxide, and iron oxide.

[0035] In some embodiments, the arrangement of the plurality of the color - developing particles in the pressure - sensitive adhesive film 12 may be a layered arrangement. Specifically, for example, it may be a layer of pressure - sensitive adhesive wrapping color - developing particles containing copper oxide stacked on a layer of pressure - sensitive adhesive wrapping color - developing particles containing titanium dioxide, and so on. Thus, by the different colors reflected by the metal or metal - oxide particles in each layer, the source of the reflected light seen from different angles is different. From one angle, some layers of color - developing particles may be seen, and from another angle, through the gaps between the particles of the upper layer, other layers of color - developing particles may be seen, and thus a change in the appearance color is visually perceived. Preferably, the refractive indices of the color - developing particles in adjacent layers are different, so that through light reflection and interference, etc., a better iridescent effect can be further achieved.

[0036] In some other embodiments, as Figure 2 shown, the arrangement of the plurality of the color - developing particles in the pressure - sensitive adhesive film 12 may be: dividing the pressure - sensitive adhesive film 12 into several pixel blocks 1201, 1202. Adjacent pixel blocks 1201, 1202 may be pressure - sensitive adhesives wrapping different color - developing particles. Because the refractive indices of different color - developing particles are different, the color of the reflected light visually perceived at different angles is different, thus achieving a good iridescent effect.

[0037] Of course, in other embodiments, the arrangement of the plurality of the color - developing particles in the pressure - sensitive adhesive film 12 may also have other ways, not limited to the above.

[0038] In some embodiments, referring to Figure 3 , a decorative texture layer 13 may be formed on the surface of the substrate 11. The decorative texture layer 13 may be disposed between the substrate 11 and the pressure - sensitive adhesive film 12 to cooperate with the pressure - sensitive adhesive film 12 to present a stronger iridescent effect. For example, in combination with the texture on the surface of the substrate 11, under the illumination in some directions, the reflected light of some pixel blocks is weaker, and the reflected light of some other pixel blocks is stronger, so that the color of the reflected light of these other pixel blocks is visually perceived. Under the illumination in some other directions, the reflected light of some pixel blocks is stronger, and the reflected light of some other pixel blocks is weaker, so that the color of the reflected light of these some pixel blocks is visually perceived, thus achieving a good iridescent effect.

[0039] The adhesive in the pressure - sensitive adhesive film 12 may be various pressure - sensitive resins, such as pressure - sensitive polyacrylates, polyurethanes, polyvinyl chlorides, polyvinyl ethers, etc. Preferably, the adhesive in the pressure - sensitive adhesive film 12 is a pressure - sensitive acrylic resin. Among them, the pressure - sensitive resin may be solvent - based, aqueous solution - based, etc., without special limitation.

[0040] In some embodiments, referring to Figure 4, the pressure - sensitive adhesive film 12 includes a first pressure - sensitive adhesive layer 121, a color - changing pressure - sensitive adhesive layer 122, and a second pressure - sensitive adhesive layer 123 that are successively adhered to each other; wherein, the color - changing pressure - sensitive adhesive layer 122 contains a pressure - sensitive adhesive and a variety of the color - developing particles dispersed in the pressure - sensitive adhesive, and the variety of the color - developing particles are arranged in layers or zones in the color - changing pressure - sensitive adhesive layer 122. That is to say, the variety of the color - developing particles are disposed in the color - changing pressure - sensitive adhesive layer 122, and the color - developing particles are not provided in the first pressure - sensitive adhesive layer 121 and the second pressure - sensitive adhesive layer 123; the color - changing pressure - sensitive adhesive layer 122 is sandwiched between the first pressure - sensitive adhesive layer 121 and the second pressure - sensitive adhesive layer 123. On the one hand, it can ensure the flatness of the surface of the pressure - sensitive adhesive film 12 and protect the variety of the color - developing particles. On the other hand, it is used to make the pressure - sensitive adhesive film 12 have a higher adhesive force, which is more conducive to the combination of the pressure - sensitive adhesive film 12 with the substrate 11 and other surfaces. It can be understood that the first pressure - sensitive adhesive layer 121 and the second pressure - sensitive adhesive layer 123 may not be provided, and the pressure - sensitive adhesive film 12 only includes the color - changing pressure - sensitive adhesive layer 122.

[0041] In some preferred embodiments, the glue for forming the color - changing pressure - sensitive adhesive layer 122 includes component A and component B. Component A includes: a first solvent - based acrylic resin, a second solvent - based acrylic resin, the color - developing particles, a color - developing particle orienting agent, an anti - settling agent, a dispersant, an ultraviolet light stabilizer, an ultraviolet absorber, a color - developing auxiliary agent, and component B includes a curing agent.

[0042] Among them, the glass transition temperature of the first solvent - based acrylic resin is lower than that of the second solvent - based acrylic resin; wherein, the Tg value of the acrylic resin determines the hardness and scratch resistance of its coating film. The higher the Tg value, the harder the coating film and the stronger the scratch resistance. The lower the Tg value, the lower the hardness of its coating film and the worse its scratch resistance. When the temperature is higher in summer, the coating film is easy to soften, re - stick, and is easily contaminated; and, the higher the Tg value of the acrylic resin, the better the drying rate of the coating film. The lower the Tg value, the worse the drying rate; in addition, the higher the Tg value of the acrylic resin, the better its solvent release property. The lower the Tg value, the worse the solvent release property; further, under the same resin synthesis reaction conditions, the higher the Tg value of the resin, the greater the final viscosity of the resin reaction (the larger the molecular weight). The lower the Tg value of the resin, the lower the final viscosity of the resin reaction (the smaller the molecular weight); also, the higher the Tg value of the acrylic resin, the better the solvent and corrosion resistance of the coating film. The lower the Tg value of the resin, the worse the corrosion and solvent resistance of the coating film. Therefore, in the embodiments of the present application, two acrylic resins with different Tg values are used, so as to obtain a color - changing pressure - sensitive adhesive layer with better and more balanced surface hardness, flexibility, drying rate, solvent release property, viscosity, solvent and corrosion resistance, etc.

[0043] The reasons for choosing solvent-based acrylic resin are as follows: 1. The viscosity of solvent-based acrylic resin can be adjusted by adding solvents to regulate the viscosity of the pressure-sensitive adhesive system, making it easy to coat and operate during the coating process. 2. Solvent-based acrylic resin has good cohesion and high bonding strength. 3. Solvent-based acrylic resin is easy to synthesize and is not prone to explosive polymerization during the synthesis process, resulting in it being unusable. The synthesis process is easy to control.

[0044] Preferably, the glass transition temperature of the first solvent-based acrylic resin ranges from -45°C to -40°C, and the glass transition temperature of the second solvent-based acrylic resin ranges from -30°C to -20°C.

[0045] In some embodiments, the mass fraction of the first solvent-based acrylic resin in the component A is 30% to 55%; the mass fraction of the second solvent-based acrylic resin in the component A is 20% to 40%.

[0046] In some embodiments, the mass fraction of the color-developing particles in the component A is 1% to 4%; among them, as the weight of the color-developing particles increases, the iridescent effect of the pressure-sensitive adhesive film 12 becomes more obvious, but it may reduce the flatness and adhesion of the pressure-sensitive adhesive film 12. The mass fraction of the color-developing particles in this embodiment can make the pressure-sensitive adhesive film 12 have both a good iridescent effect and good adhesion.

[0047] In some embodiments, the color-developing particle orienting agent can be one or more of polyethylene wax and polyether phosphate; the color-developing particle orienting agent can make the dispersion of the color-developing particles more uniform, and also has a good anti-settling effect, and can also improve the surface smoothness and gloss of the color-changing pressure-sensitive adhesive layer; in some embodiments, the mass fraction of the color-developing particle orienting agent in the component A is 1% to 2%.

[0048] In some embodiments, the anti-settling agent can be polyamide wax, and the anti-settling agent can prevent the color-developing particles from settling, thereby making the dispersion of the color-developing particles more uniform; in some embodiments, the mass fraction of the anti-settling agent in the component A is 0.5% to 1%.

[0049] In some embodiments, the dispersant may be one or several of decyltrimethoxysilane, dodecyltrimethoxysilane, tetradecyltrimethoxysilane, etc.; among them, the coloring particles generally have poor compatibility with non-polar or weakly polar resins. Therefore, the particles of the coloring particles tend to aggregate together to form large agglomerates, which affects their subsequent applications. The dispersant can coat the surface of the small agglomerate particles and primary microcrystalline particles formed after the large agglomerate particles are broken during the shear dispersion process. The coated small agglomerate particles and primary microcrystalline particles can no longer re-aggregate together. Moreover, the non-polar groups grafted on the molecular chain of the dispersant also make these coated particles compatible with the resin, so that the coloring particles can be uniformly dispersed; in some embodiments, the mass fraction of the dispersant in the component A is 0.3% to 0.8%.

[0050] In some embodiments, the ultraviolet light stabilizer may be one or several of salicylic acid esters, substituted acrylonitriles, hindered amines, organonickel compounds, etc. The ultraviolet light stabilizer is used to make the double bonds in the resin more stable, so that the acrylic resin is not easily aged under strong ultraviolet light or xenon lamp irradiation, and the anti-aging performance of the material is improved; in some embodiments, the mass fraction of the ultraviolet light stabilizer in the component A is 0.1% to 0.5%.

[0051] In some embodiments, the ultraviolet absorber is one or several of benzotriazole, benzophenone, triazine, oxanilide, etc. The ultraviolet absorber is used to absorb ultraviolet light, so that the acrylic pressure-sensitive resin has good ultraviolet light resistance and improved anti-yellowing performance, thereby greatly improving the anti-aging performance of the product; in some embodiments, the mass fraction of the ultraviolet light absorber in the component A is 0.1% to 0.5%.

[0052] In some embodiments, the coloring aid may be selected from one or several of mica, silica, calcium carbonate, etc.; among them, mica powder is generally mixed and stirred with the coloring particles, so that the mica powder can agglomerate with the coloring particles to form agglomerate particles. There are a small number of exposed active -OH bonds (hydroxyl groups) on the surface of the mica powder, which can easily react with the organic resin and additives, and then the agglomerate particles can be uniformly and stably dispersed in the organic resin and additives; in some embodiments, the mass fraction of the coloring aid in the component A is 0.1% to 0.3%.

[0053] In some embodiments, the component B may be a curing agent such as Bayer curing agent L75, etc.; the amount of the curing agent can be set as needed. The curing agent can crosslink some hydroxyl groups in the acrylic resin to improve the cohesive strength; in some specific embodiments, when the mass fraction of the component A is 100, the mass fraction of the curing agent can be 0.05 to 0.3 parts.

[0054] In some embodiments, the main components of the adhesives forming the first pressure-sensitive adhesive layer 121, the color-changing pressure-sensitive adhesive layer 122, and the second pressure-sensitive adhesive layer 123 are the same. That is to say, the materials and components of the three adhesive layers of the pressure-sensitive adhesive film 12 are substantially the same, and both include the first solvent-based acrylic resin and the second solvent-based acrylic resin, so that each adhesive layer of the pressure-sensitive adhesive film 12 has good consistency and good interlayer adhesion.

[0055] In some specific embodiments, the adhesives forming the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer also include component A and component B. Component A includes: the aforementioned first solvent-based acrylic resin, second solvent-based acrylic resin, ultraviolet light stabilizer, and ultraviolet absorber. Component B includes a curing agent (specifically, refer to the foregoing). The content of each component in component A of the adhesives forming the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer and the mass ratio of each component in component A are as follows:

[0056] First solvent-based acrylic resin, 50% to 75%;

[0057] Second solvent-based acrylic resin, 30% to 50%;

[0058] Ultraviolet light stabilizer, 0.1% to 2%;

[0059] Ultraviolet absorber, 0.1% to 1%.

[0060] Among them, the initial adhesion of the first pressure-sensitive adhesive layer 121, the color-changing pressure-sensitive adhesive layer 122, and the second pressure-sensitive adhesive layer 123 preferably satisfies 15 N / 24 mm to 40 N / 24 mm (pull-off force test, and the specific test method refers to the specific embodiment part at the end of the text), and the holding power is preferably greater than or equal to 24 hours.

[0061] In some embodiments, the total thickness of the pressure-sensitive adhesive film 12 is preferably 25 microns to 75 microns; the thickness of the first pressure-sensitive adhesive layer 121 is preferably 5 microns to 25 microns, the thickness of the color-changing pressure-sensitive adhesive layer 122 is preferably 10 microns to 35 microns, and the thickness of the second pressure-sensitive adhesive layer 123 is preferably 5 microns to 25 microns. The selection of this thickness can make the pressure-sensitive adhesive film 12 have good adhesion and good iridescent presentation, and is more suitable for the surface of the housing. Among them, if the total thickness of the pressure-sensitive adhesive film 12 is too small, the adhesion of the pressure-sensitive adhesive film 12 will decrease. If the thickness of the color-changing pressure-sensitive adhesive layer 122 is too small, the iridescent effect of the pressure-sensitive adhesive film 12 will not be obvious. If the total thickness of the pressure-sensitive adhesive film 12 is too large, it will increase the thickness of the housing, which is not conducive to the thin and light of the electronic device. If the thickness of the color-changing pressure-sensitive adhesive layer 122 is too large, it will affect the flatness of the pressure-sensitive adhesive film 12, and will also increase the thickness of the housing, which is not conducive to the thin and light of the electronic device.

[0062] In a specific embodiment, the color of the pressure-sensitive adhesive film 12 is golden from a certain perspective. Among them, the pressure-sensitive adhesive film 12 includes a first color-changing pressure-sensitive adhesive sub-layer, and the various color-developing particles in the first color-changing pressure-sensitive adhesive sub-layer and the mass fraction of each color-developing particle in the total color-developing particles are as follows:

[0063] Copper oxide, 88.2% ± 1%;

[0064] Titanium dioxide, 1.2% ± 0.1%;

[0065] Tungsten oxide, 0.4% ± 0.1%;

[0066] Vanadium oxide, 0.1% ± 0.05%;

[0067] Iridium oxide, 10.1% ± 1%.

[0068] In another specific embodiment, the color of the pressure-sensitive adhesive film 12 is champagne from a certain perspective. Among them, the pressure-sensitive adhesive film 12 includes a second color-changing pressure-sensitive adhesive sub-layer, and the various color-developing particles in the second color-changing pressure-sensitive adhesive sub-layer and the mass fraction of each color-developing particle in the total color-developing particles are as follows:

[0069] Copper oxide, 66% ± 1%;

[0070] Titanium dioxide, 3% ± 0.1%;

[0071] Aluminum powder, 0.3% ± 0.1%;

[0072] Manganese oxide, 0.3% ± 0.1%;

[0073] Tungsten oxide, 10% ± 1%;

[0074] Vanadium oxide, 2% ± 0.1%;

[0075] Zirconium oxide, 0.5% ± 0.1%;

[0076] Iridium oxide, 17.9% ± 1%.

[0077] In another specific embodiment, the color of the pressure-sensitive adhesive film 12 is blue from a certain perspective. Among them, the pressure-sensitive adhesive film 12 includes a third color-changing pressure-sensitive adhesive sub-layer, and the various color-developing particles in the third color-changing pressure-sensitive adhesive sub-layer and the mass fraction of each color-developing particle in the total color-developing particles are as follows:

[0078] Titanium dioxide, 5% ± 0.1%;

[0079] Aluminum powder, 0.5% ± 0.1%;

[0080] Manganese oxide, 0.1% ± 0.05%;

[0081] Tungsten oxide, 12% ± 1%;

[0082] Vanadium oxide, 59.5% ± 1%;

[0083] Zirconium oxide, 2% ± 0.1%;

[0084] Iridium oxide, 20.9% ± 1%.

[0085] In other embodiments, the pressure-sensitive adhesive film 12 may also have other colors and contain other color-developing particles. The specific components and proportions can be adjusted based on the required color on the basis of the foregoing specific embodiments.

[0086] It can be understood that the pressure-sensitive adhesive film 12 can be formed in a partial area or the entire area of the iridescent housing 100, and the present application does not limit this; wherein, when the pressure-sensitive adhesive film 12 is formed in a partial area of the iridescent housing 100, it can also have a predetermined shape or pattern, such as artistic characters, artistic patterns, etc.; it depends on the design requirements specifically.

[0087] In some embodiments, please refer to Figure 5 , the iridescent housing 100 further includes a color layer 14 disposed between the base material 11 and the decorative texture layer 13. The color layer 14 can co-develop colors with the pressure-sensitive adhesive film 12 so that the iridescent housing 100 has richer colors; it can be understood that the color layer 14 can be formed in a partial area or the entire area of the iridescent housing 100, and the color layer 14 can be disposed superimposed with the pressure-sensitive adhesive film 12 or staggered with the pressure-sensitive adhesive film 12, depending on the design requirements specifically.

[0088] In some embodiments, please refer to Figure 6 , the iridescent housing 100 further includes an optical film layer 15 and a cover bottom layer 16 disposed on the side of the pressure-sensitive adhesive film 12 away from the base material 11.

[0089] In some embodiments, please refer to Figure 7 , the iridescent housing 100 further includes a hardening layer 17 disposed on the side of the base material 11 away from the pressure-sensitive adhesive film 12.

[0090] In a specific embodiment, please refer to Figure 8 , the material of the base material 11 is PMMA / PC composite resin, and the base material 11 includes a base material-PMMA 11a and a base material-PC 11b stacked in sequence; wherein, when using the base material 11, the base material-PC 11b can be disposed facing the pressure-sensitive adhesive film 12.

[0091] In another specific embodiment, please refer to Figure 7, the material of the base material 11 is glass, and the colorful shell 100 includes a cover bottom layer 17, a glass base material 11, a color layer 14, a decorative texture layer 13, a pressure-sensitive adhesive film 12, an optical film layer 15, and a cover bottom layer 16 that are stacked in sequence.

[0092] It should be noted that the stacking structure of the colorful shell 100 / 100a is not limited to the above examples.

[0093] Please refer to Figure 9 , another embodiment of the present application provides a method for preparing a colorful shell, including:

[0094] S201, providing a base material;

[0095] S202, preparing a pressure-sensitive adhesive film; wherein, a variety of color-developing particles are dispersed in the pressure-sensitive adhesive film, the colors of the variety of color-developing particles are different, and the variety of color-developing particles are arranged in layers or regions in the pressure-sensitive adhesive film;

[0096] S203, attaching the pressure-sensitive adhesive film to one side surface of the base material to obtain the colorful shell.

[0097] In some embodiments, the pressure-sensitive adhesive film includes a first pressure-sensitive adhesive layer, a color-changing pressure-sensitive adhesive layer, and a second pressure-sensitive adhesive layer that are attached in sequence, wherein the color-changing pressure-sensitive adhesive layer contains a pressure-sensitive adhesive and a variety of the color-developing particles dispersed in the pressure-sensitive adhesive; please refer to Figure 10 , the steps for preparing the pressure-sensitive adhesive film include:

[0098] S2021, coating a first pressure-sensitive adhesive glue on a release paper, and obtaining the first pressure-sensitive adhesive layer after curing;

[0099] S2022, coating a pressure-sensitive adhesive glue containing color-developing particles on the first pressure-sensitive adhesive layer, and obtaining the color-changing pressure-sensitive adhesive layer after curing;

[0100] S2023, coating a second pressure-sensitive adhesive glue on the surface of the color-changing pressure-sensitive adhesive layer, and obtaining the second pressure-sensitive adhesive layer after curing;

[0101] S2024, removing the release paper to obtain the pressure-sensitive adhesive film.

[0102] Among them, the pressure-sensitive adhesive glue containing color-developing particles can be obtained by mixing color-developing particles with a pressure-sensitive adhesive glue; when coating the pressure-sensitive adhesive glue containing color-developing particles, the pressure-sensitive adhesive glues containing different color-developing particles can be coated according to a predetermined rule so that different color-developing particles are arranged according to a predetermined rule; for example, the pressure-sensitive adhesive glues containing different color-developing particles are coated in layers, so that the arrangement mode of the variety of color-developing particles in the pressure-sensitive adhesive film is a layered arrangement; or, the pressure-sensitive adhesive glues containing different color-developing particles are coated in regions, so that the arrangement mode of the variety of color-developing particles in the pressure-sensitive adhesive film is a regional arrangement.

[0103] In some embodiments, the release paper can be made of materials such as polyethylene terephthalate (PET), polyethylene (PE), polyvinyl chloride (PVC), polyimide (PI), polyoxymethylene (POM), etc.; the pressure-sensitive adhesive can be a solvent-based or UV-based adhesive.

[0104] Contents not involved in this embodiment can be referred to those described in the first embodiment and will not be elaborated here.

[0105] Please refer to Figure 11 , yet another embodiment of the present application further provides a color-changing pressure-sensitive tape 300, which includes a release paper 310 and a pressure-sensitive adhesive film 312 formed on one surface of the release paper 310; wherein, a variety of color-developing particles are encapsulated in the pressure-sensitive adhesive film 312, the colors of the variety of color-developing particles are different, and the variety of color-developing particles are arranged in layers or zones in the pressure-sensitive adhesive film.

[0106] In some embodiments, please refer to Figure 12 , the pressure-sensitive adhesive film 312 may include a first pressure-sensitive adhesive layer 3121, a color-changing pressure-sensitive adhesive layer 3122 and a second pressure-sensitive adhesive layer 3123 that are attached to each other in sequence; wherein, the color-changing pressure-sensitive adhesive layer 3122 contains a pressure-sensitive adhesive and a variety of the color-developing particles dispersed in the pressure-sensitive adhesive, that is to say, the variety of color-developing particles are disposed in the color-changing pressure-sensitive adhesive layer 3122, and the first pressure-sensitive adhesive layer 3121 and the second pressure-sensitive adhesive layer 3123 do not have the color-developing particles disposed therein, and the color-changing pressure-sensitive adhesive layer 3122 is sandwiched between the first pressure-sensitive adhesive layer 3121 and the second pressure-sensitive adhesive layer 3123.

[0107] The color-changing pressure-sensitive tape 300 can be in a roll shape, a sheet shape, etc.; the material of the release paper 310 can be, but is not limited to, PET, PE, PVC, PI, POM, etc.; the color-changing pressure-sensitive tape 300 can be applied to the surface of an electronic device or the surface of any other object that needs to be decorated.

[0108] Among them, contents not involved in this embodiment can be referred to those described in the first embodiment and will not be elaborated here.

[0109] When using the color-changing pressure-sensitive tape 300, the color-changing pressure-sensitive tape 300 can be attached to the object to be bonded and force can be applied to firmly adhere the color-changing pressure-sensitive tape 300 to the surface of the object to be bonded, and then the release paper 310 can be removed.

[0110] As shown in FIG. 13, yet another embodiment of the present application further provides an electronic device 400, which includes a color-changing housing 100 as described in the foregoing embodiments of the present application, or includes a color-changing housing prepared by the preparation method of the color-changing housing as described above.

[0111] In some embodiments, the iridescent housing 100 may be, for example, the battery back cover of the electronic device 400. The iridescent housing 100 is provided with a receiving cavity 101, and a battery assembly 102 is received in the receiving cavity 101.

[0112] In some embodiments, the electronic device 400 further includes a display screen 401, and the iridescent housing 100 is disposed on the back surface of the display screen 401.

[0113] In some embodiments, the electronic device 400 is, for example, a portable and mobile computing device such as a smart phone, a laptop computer, a tablet computer, a gaming device, or a wearable device.

[0114] The iridescent housing of this case will be described below in conjunction with specific embodiments.

[0115] Embodiment 1

[0116] Provide a glass substrate; prepare a pressure-sensitive adhesive film with a thickness of 38 microns; wherein, a plurality of color-developing particles are dispersed in the pressure-sensitive adhesive film, the colors of the plurality of color-developing particles are different, and the plurality of color-developing particles are arranged in layers in the pressure-sensitive adhesive film; bond the pressure-sensitive adhesive film to one surface of the substrate to obtain the iridescent housing; wherein, the pressure-sensitive adhesive film includes a first pressure-sensitive adhesive layer, a color-changing pressure-sensitive adhesive layer, and a second pressure-sensitive adhesive layer that are sequentially adhered to each other.

[0117] Wherein, the color-changing pressure-sensitive adhesive layer at least includes a first color-changing pressure-sensitive adhesive sub-layer and a second color-changing pressure-sensitive adhesive sub-layer; the glue components forming the first and second color-changing pressure-sensitive adhesive sub-layers are the same except for the color-developing particles, and specifically include component A and component B. The content of each component in component A and the mass ratio of each component in component A are as follows:

[0118] First solvent-based acrylic resin, 54%;

[0119] Second solvent-based acrylic resin, 38%;

[0120] Color-developing particles, 4%;

[0121] Polyethylene wax, 2%;

[0122] Polyamide wax, 0.5%;

[0123] Dodecyltrimethoxysilane, 0.5%;

[0124] Salicylic acid ester, 0.3%;

[0125] Benzotriazole, 0.5%;

[0126] Mica powder, 0.2%.

[0127] The component B is Bayer curing agent L75, and the mass ratio of the component A to the component B is 100:0.1.

[0128] Among them, the various color-developing particles in the first pressure-sensitive color-changing adhesive sub-layer and the mass fraction of each color-developing particle in the total color-developing particles are:

[0129] Copper oxide, 88.1%;

[0130] Titanium dioxide, 1.3%;

[0131] Tungsten oxide, 0.4%;

[0132] Vanadium oxide, 0.1%;

[0133] Iridium oxide, 10.1%.

[0134] The various color-developing particles in the second pressure-sensitive color-changing adhesive sub-layer and the mass fraction of each color-developing particle in the total color-developing particles are:

[0135] Copper oxide, 66%;

[0136] Titanium dioxide, 3%;

[0137] Aluminum powder, 0.3%;

[0138] Manganese oxide, 0.3%;

[0139] Tungsten oxide, 10%;

[0140] Vanadium oxide, 2%;

[0141] Zirconium oxide, 0.5%;

[0142] Iridium oxide, 17.9%.

[0143] The glass transition temperature of the first solvent-based acrylic resin is -40°C, and the glass transition temperature of the second solvent-based acrylic resin is -25°C.

[0144] Observe the appearance of the housing in Example 1, and conduct a pull-out force test, an artificial sweat test, a thermal shock test, a boiling water test, and a dispersion test on the housing in Example 1.

[0145] Example 2

[0146] Provide a glass substrate; prepare a pressure-sensitive adhesive film with a thickness of 38 microns; wherein, a variety of color-developing particles are dispersed in the pressure-sensitive adhesive film, the colors of the variety of color-developing particles are different, and the variety of color-developing particles are arranged in layers in the pressure-sensitive adhesive film; attach the pressure-sensitive adhesive film to one surface of the substrate to obtain the iridescent shell; wherein, the pressure-sensitive adhesive film includes a first pressure-sensitive adhesive layer, a color-changing pressure-sensitive adhesive layer and a second pressure-sensitive adhesive layer that are adhered to each other in sequence.

[0147] Wherein, the color-changing pressure-sensitive adhesive layer at least includes a first color-changing pressure-sensitive adhesive sub-layer and a second color-changing pressure-sensitive adhesive sub-layer; the glue components for forming the first and second color-changing pressure-sensitive adhesive sub-layers are the same except for the color-developing particles, and specifically include component A and component B. The content of each component in component A and the mass percentage of each component in component A are as follows:

[0148] First solvent-based acrylic resin, 54%;

[0149] Second solvent-based acrylic resin, 38%;

[0150] Color-developing particles, 4%;

[0151] Polyethylene wax, 2%;

[0152] Polyamide wax, 0.5%;

[0153] Dodecyltrimethoxysilane, 0.5%;

[0154] Salicylic acid ester, 0.3%;

[0155] Benzotriazole, 0.5%;

[0156] Mica powder, 0.2%.

[0157] Component B is Bayer curing agent L75, and the mass ratio of component A to component B is: 100:0.1.

[0158] Wherein, the variety of color-developing particles in the first color-changing pressure-sensitive adhesive sub-layer and the mass fraction of each color-developing particle in the total color-developing particles are:

[0159] Copper oxide, 88.1%;

[0160] Titanium dioxide, 1.3%;

[0161] Tungsten oxide, 0.4%;

[0162] Vanadium oxide, 0.1%;

[0163] Iridium oxide, 10.1%.

[0164] The variety of color-developing particles in the second color-changing pressure-sensitive adhesive sub-layer and the mass fraction of each color-developing particle in the total color-developing particles are:

[0165] Titanium dioxide, 5%;

[0166] Aluminum powder, 0.5%;

[0167] Manganese oxide, 0.1%;

[0168] Tungsten oxide, 12%;

[0169] Vanadium oxide, 59.5%;

[0170] Zirconium oxide, 2%;

[0171] Iridium oxide, 20.9%.

[0172] The glass transition temperature of the first solvent-based acrylic resin is -40°C, and the glass transition temperature of the second solvent-based acrylic resin is -25°C.

[0173] Observe the appearance of the housing in Example 2, and conduct a pull-out force test, an artificial sweat test, a thermal shock test, a boiling water test, and a dispersion test on the housing in Example 2.

[0174] Example 3

[0175] Provide a glass substrate; prepare a pressure-sensitive adhesive film with a thickness of 38 microns; wherein, a variety of color-developing particles are dispersed in the pressure-sensitive adhesive film, the colors of the variety of color-developing particles are different, and the variety of color-developing particles are arranged in layers in the pressure-sensitive adhesive film; bond the pressure-sensitive adhesive film to one surface of the substrate to obtain the iridescent housing; wherein, forming the pressure-sensitive adhesive film includes a first color-changing pressure-sensitive adhesive sub-layer and a second color-changing pressure-sensitive adhesive sub-layer that are adhered to each other, and the first color-changing pressure-sensitive adhesive sub-layer is adhered to the substrate; the glue components for forming the first and second color-changing pressure-sensitive adhesive sub-layers are the same except for the color-developing particles, and specifically include component A and component B. The content of each component in component A and the mass ratio of each component in component A are as follows:

[0176] First solvent-based acrylic resin, 54%;

[0177] Second solvent-based acrylic resin, 38%;

[0178] Color-developing particles, 4%;

[0179] Polyethylene wax, 2%;

[0180] Polyamide wax, 0.5%;

[0181] Dodecyltrimethoxysilane, 0.5%;

[0182] Salicylic acid ester, 0.3%;

[0183] Benzotriazole, 0.5%;

[0184] Mica powder, 0.2%.

[0185] The component B is Bayer curing agent L75, and the mass ratio of the component A to the component B is: 100:0.1.

[0186] Among them, the various color-developing particles in the first pressure-sensitive color-changing adhesive sub-layer and the mass fraction of each color-developing particle in the total color-developing particles are:

[0187] Copper oxide, 88.1%;

[0188] Titanium dioxide, 1.3%;

[0189] Tungsten oxide, 0.4%;

[0190] Vanadium oxide, 0.1%;

[0191] Iridium oxide, 10.1%.

[0192] The various color-developing particles in the second pressure-sensitive color-changing adhesive sub-layer and the mass fraction of each color-developing particle in the total color-developing particles are:

[0193] Copper oxide, 66%;

[0194] Titanium dioxide, 3%;

[0195] Aluminum powder, 0.3%;

[0196] Manganese oxide, 0.3%;

[0197] Tungsten oxide, 10%;

[0198] Vanadium oxide, 2%;

[0199] Zirconium oxide, 0.5%;

[0200] Iridium oxide, 17.9%.

[0201] The glass transition temperature of the first solvent-based acrylic resin is -40°C, and the glass transition temperature of the second solvent-based acrylic resin is -25°C.

[0202] Observe the appearance of the housing in Example 3, and conduct a pull-out force test, an artificial sweat test, a thermal shock test, a boiling water test, and a dispersion detection on the housing in Example 3.

[0203] Comparative Example 1

[0204] Provide a glass substrate; prepare a pressure-sensitive adhesive film with a thickness of 38 microns; wherein, a variety of color-developing particles are dispersed in the pressure-sensitive adhesive film, the colors of the variety of color-developing particles are different, and the variety of color-developing particles are arranged in layers in the pressure-sensitive adhesive film; attach the pressure-sensitive adhesive film to one side surface of the substrate to obtain the colorful shell; wherein, the pressure-sensitive adhesive film includes a first pressure-sensitive adhesive layer, a color-changing pressure-sensitive adhesive layer and a second pressure-sensitive adhesive layer that are adhered to each other in sequence.

[0205] Wherein, the color-changing pressure-sensitive adhesive layer at least includes a first color-changing pressure-sensitive adhesive sub-layer and a second color-changing pressure-sensitive adhesive sub-layer; the glue components for forming the first and second color-changing pressure-sensitive adhesive sub-layers are the same except for the color-developing particles, and specifically include component A and component B. The content of each component in component A and the mass ratio of each component in component A are: first solvent-based acrylic resin, 92%; color-developing particles, 4%; polyethylene wax, 2%; polyamide wax, 0.5%; dodecyltrimethoxysilane, 0.5%; salicylic acid ester, 0.3%; benzotriazole, 0.5%; mica powder, 0.2%. The component B is Bayer curing agent L75, and the mass ratio of the component A to the component B is: 100:0.1.

[0206] Wherein, the variety of color-developing particles in the first color-changing pressure-sensitive adhesive sub-layer and the mass fraction of each color-developing particle in the total color-developing particles are: copper oxide, 88.1%; titanium dioxide, 1.3%; tungsten oxide, 0.4%; vanadium oxide, 0.1%; iridium oxide, 10.1%.

[0207] The variety of color-developing particles in the second color-changing pressure-sensitive adhesive sub-layer and the mass fraction of each color-developing particle in the total color-developing particles are: copper oxide, 66%; titanium dioxide, 3%; aluminum powder, 0.3%; manganese oxide, 0.3%; tungsten oxide, 10%; vanadium oxide, 2%; zirconium oxide, 0.5%; iridium oxide, 17.9%.

[0208] The glass transition temperature of the first solvent-based acrylic resin is -40°C.

[0209] Observe the appearance of the shell in Comparative Example 1, and conduct a pull-out force test, an artificial sweat test, a thermal shock test, a boiling water test, and a dispersion test on the shell in Comparative Example 1.

[0210] Comparative Example 2

[0211] Provide a glass substrate; prepare a pressure-sensitive adhesive film with a thickness of 38 microns; wherein, a variety of color-developing particles are dispersed in the pressure-sensitive adhesive film, the colors of the variety of color-developing particles are different, and the variety of color-developing particles are arranged in layers in the pressure-sensitive adhesive film; attach the pressure-sensitive adhesive film to one side surface of the substrate to obtain the colorful shell; wherein, the pressure-sensitive adhesive film includes a first pressure-sensitive adhesive layer, a color-changing pressure-sensitive adhesive layer and a second pressure-sensitive adhesive layer that are adhered to each other in sequence.

[0212] Among them, the color-changing pressure-sensitive adhesive layer at least includes a first color-changing pressure-sensitive adhesive sub-layer and a second color-changing pressure-sensitive adhesive sub-layer; the glue components forming the first and second color-changing pressure-sensitive adhesive sub-layers are the same except for the color-developing particles, and specifically include component A and component B. The content of each component in component A and the mass ratio of each component in component A are as follows: second solvent-based acrylic resin, 92%; color-developing particles, 4%; polyethylene wax, 2%; polyamide wax, 0.5%; dodecyltrimethoxysilane, 0.5%; salicylic acid ester, 0.3%; benzotriazole, 0.5%; mica powder, 0.2%. The component B is Bayer curing agent L75, and the mass ratio of the component A to the component B is: 100:0.1.

[0213] Among them, the various color-developing particles in the first color-changing pressure-sensitive adhesive sub-layer and the mass fraction of each color-developing particle in the total color-developing particles are as follows: copper oxide, 88.1%; titanium dioxide, 1.3%; tungsten oxide, 0.4%; vanadium oxide, 0.1%; iridium oxide, 10.1%.

[0214] The various color-developing particles in the second color-changing pressure-sensitive adhesive sub-layer and the mass fraction of each color-developing particle in the total color-developing particles are as follows: copper oxide, 66%; titanium dioxide, 3%; aluminum powder, 0.3%; manganese oxide, 0.3%; tungsten oxide, 10%; vanadium oxide, 2%; zirconium oxide, 0.5%; iridium oxide, 17.9%.

[0215] The glass transition temperature range of the second solvent-based acrylic resin is -40°C.

[0216] Observe the appearance of the housing of Comparative Example 2, and conduct a pull-out force test, an artificial sweat test, a thermal shock test, a boiling water test, and a dispersion detection on the housing in Comparative Example 2.

[0217] Comparative Example 3

[0218] Provide a glass substrate; prepare a pressure-sensitive adhesive film with a thickness of 38 microns; among them, various color-developing particles are dispersed in the pressure-sensitive adhesive film, the colors of the various color-developing particles are different, and the various color-developing particles are arranged in layers in the pressure-sensitive adhesive film; bond the pressure-sensitive adhesive film to one surface of the substrate to obtain the iridescent housing; among them, the pressure-sensitive adhesive film includes a first pressure-sensitive adhesive layer, a color-changing pressure-sensitive adhesive layer, and a second pressure-sensitive adhesive layer that are successively adhered to each other.

[0219] Among them, the color-changing pressure-sensitive adhesive layer at least includes a first color-changing pressure-sensitive adhesive sub-layer and a second color-changing pressure-sensitive adhesive sub-layer; the glue components forming the first and second color-changing pressure-sensitive adhesive sub-layers are the same except for the color-developing particles, specifically including component A and component B. The content of each component in component A and the mass ratio of each component in component A are as follows: first solvent-based acrylic resin, 54%; second solvent-based acrylic resin, 38%; color-developing particles, 4%; polyethylene wax, 2%; polyamide wax, 0.8%; salicylic acid ester, 0.5%; benzotriazole, 0.5%; mica powder, 0.2%. Component B is Bayer curing agent L75, and the mass ratio of component A to component B is 100:0.1.

[0220] Among them, the various color-developing particles in the first color-changing pressure-sensitive adhesive sub-layer and the mass fraction of each color-developing particle in the total color-developing particles are as follows: copper oxide, 88.1%; titanium dioxide, 1.3%; tungsten oxide, 0.4%; vanadium oxide, 0.1%; iridium oxide, 10.1%.

[0221] The various color-developing particles in the second color-changing pressure-sensitive adhesive sub-layer and the mass fraction of each color-developing particle in the total color-developing particles are as follows: copper oxide, 66%; titanium dioxide, 3%; aluminum powder, 0.3%; manganese oxide, 0.3%; tungsten oxide, 10%; vanadium oxide, 2%; zirconium oxide, 0.5%; iridium oxide, 17.9%.

[0222] The glass transition temperature of the first solvent-based acrylic resin is -40°C, and the glass transition temperature of the second solvent-based acrylic resin is -25°C.

[0223] Observe the appearance of the housing in Comparative Example 3, and conduct a pull-out force test, an artificial sweat test, a thermal shock test, a boiling water test, and a dispersion detection on the housing in Comparative Example 3.

[0224] Comparative Example 4

[0225] Provide a glass substrate; prepare a pressure-sensitive adhesive film with a thickness of 38 microns; among them, various color-developing particles are dispersed in the pressure-sensitive adhesive film, the colors of the various color-developing particles are different, and the various color-developing particles are arranged in layers in the pressure-sensitive adhesive film; attach the pressure-sensitive adhesive film to one surface of the substrate to obtain the colorful housing; among them, the pressure-sensitive adhesive film includes a first pressure-sensitive adhesive layer, a color-changing pressure-sensitive adhesive layer, and a second pressure-sensitive adhesive layer that are attached to each other in sequence.

[0226] Among them, the color-changing pressure-sensitive adhesive layer at least includes a first color-changing pressure-sensitive adhesive sub-layer and a second color-changing pressure-sensitive adhesive sub-layer; the glue components forming the first and second color-changing pressure-sensitive adhesive sub-layers are the same except for the color-developing particles, and specifically include component A and component B. The content of each component in component A and the mass ratio of each component in component A are as follows: first solvent-based acrylic resin, 54%; second solvent-based acrylic resin, 38%; color-developing particles, 4%; polyethylene wax, 2%; polyamide wax, 0.6%; dodecyltrimethoxysilane, 0.6%; salicylic acid ester, 0.3%; benzotriazole, 0.5%. Component B is Bayer curing agent L75, and the mass ratio of component A to component B is 100:0.1.

[0227] Among them, the various color-developing particles in the first color-changing pressure-sensitive adhesive sub-layer and the mass fraction of each color-developing particle in the total color-developing particles are as follows: copper oxide, 88.1%; titanium dioxide, 1.3%; tungsten oxide, 0.4%; vanadium oxide, 0.1%; iridium oxide, 10.1%.

[0228] The various color-developing particles in the second color-changing pressure-sensitive adhesive sub-layer and the mass fraction of each color-developing particle in the total color-developing particles are as follows: copper oxide, 66%; titanium dioxide, 3%; aluminum powder, 0.3%; manganese oxide, 0.3%; tungsten oxide, 10%; vanadium oxide, 2%; zirconium oxide, 0.5%; iridium oxide, 17.9%.

[0229] The glass transition temperature of the first solvent-based acrylic resin is -40°C, and the glass transition temperature of the second solvent-based acrylic resin is -25°C.

[0230] Observe the appearance of the housing of Comparative Example 4, and conduct a pull-out force test, an artificial sweat test, a thermal shock test, a boiling water test, and a dispersion detection on the housing in Comparative Example 4.

[0231] Comparative Example 5

[0232] Provide a glass substrate; prepare a pressure-sensitive adhesive film with a thickness of 38 microns; wherein, a variety of color-developing particles are dispersed in the pressure-sensitive adhesive film, the colors of the variety of color-developing particles are different, and the variety of color-developing particles are arranged in layers in the pressure-sensitive adhesive film; bond the pressure-sensitive adhesive film to one side surface of the substrate to obtain the iridescent shell; wherein, the glue component forming the pressure-sensitive adhesive film includes component A and component B, and the content of each component in component A and the mass percentage of each component in component A are: first solvent-based acrylic resin, 54%; second solvent-based acrylic resin, 38%; color-developing particles, 4%; polyethylene wax, 2%; polyamide wax, 0.5%; dodecyltrimethoxysilane, 0.5%; salicylic acid ester, 0.3%; benzotriazole, 0.5%; mica powder, 0.2%. Component B is Bayer curing agent L75, and the mass ratio of component A to component B is: 100:0.1.

[0233] Wherein, the color-developing particles and the mass fraction of each color-developing particle in the total color-developing particles are: copper oxide, 88.1%; titanium dioxide, 1.3%; tungsten oxide, 0.4%; vanadium oxide, 0.1%; iridium oxide, 10.1%.

[0234] The glass transition temperature of the first solvent-based acrylic resin is -40°C, and the glass transition temperature of the second solvent-based acrylic resin is -25°C.

[0235] Observe the appearance of the shell in Comparative Example 5, and conduct a pull-off force test, an artificial sweat test, a thermal shock test, a boiling water test, and a dispersion detection on the shell in Comparative Example 5.

[0236] Comparative Example 6

[0237] Provide a conventional colored shell, and the conventional colored shell includes a substrate and a color layer and a UV decorative texture layer formed on the surface of the substrate. Observe the appearance of the conventional colored shell (without conducting other item tests).

[0238] Wherein, the test method for the pull-off force test is: select a pressure-sensitive adhesive film with a width of 24 mm on the substrate, and conduct a 180° pull-off force test on an automatic tensile machine at a test speed of 300 mm / min.

[0239] The test method for artificial sweat test is as follows: Pour 1.00 ± 0.01 g of urea (analytical pure), 5.00 ± 0.01 g of sodium chloride (analytical pure) and 1.14 ± 0.02 g or 940 ± 20 μl of DL-lactic acid (>88%, analytical pure) into a 1000 ml water container; add 900 ml of fresh distilled water and stir until all the added reagents are completely dissolved to obtain a solution; gently stir and carefully add dilute ammonia water solution (1%) until the solution reaches a stable pH value of 6.50 ± 0.10 to obtain artificial sweat; take a lint-free cloth, soak it in the prepared artificial sweat, and then take it out, ensuring that no sweat drips directly from the lint-free cloth; gently wipe the surface of the sample back and forth with the sweat-soaked lint-free cloth for 2 min, with a wiping force of about 3 - 6 N; place it at room temperature for 2 h and visually inspect the appearance.

[0240] The test method for thermal shock test is as follows: Put the sample into a thermal shock test chamber, first keep it in a low-temperature environment of -40°C ± 2°C for 1 h; switch the temperature to a high-temperature environment of 70°C ± 2°C within 5 min and keep it for 1 h; the above is one cycle, and a total of 24 cycles are performed; then, take out the sample, check the appearance, and perform a pull-out force test (the test method refers to the previous one) after standing at room temperature for 2 h. Among them, the judgment criteria for thermal shock test are: no abnormal appearance, no peeling, no cracks, no discoloration, no bubbling, no cracks, etc.; the pull-out force test requires ≥15 N / 24 mm.

[0241] The test method for boiling water test is as follows: Completely immerse the test sample in pure water at 98°C ± 2°C, take it out after boiling for 1 h, let it stand at room temperature for 2 h, check whether there is any abnormality on the surface, and perform a pull-out force test. Among them, the judgment criteria for boiling water test are: no bubbles on the appearance, no peeling, and the pull-out force test reaches more than 15 N / 24 mm.

[0242] The method for dispersion detection is as follows: Observe the color-changing pressure-sensitive adhesive layer under a 30-fold microscope to detect whether the color-developing particles in the color-changing pressure-sensitive adhesive layer agglomerate. If the agglomerated particle diameter of the color-developing particles is less than 15 microns, it indicates that the color-developing particles are well dispersed.

[0243] The test results are shown in the following table:

[0244] Table 1

[0245]

[0246] As can be seen from the above table, the surface colors of the housings in Examples 1 to 3 can all change with the change of the viewing angle, thus having a colorful appearance. Moreover, whether it is the initial pull-out force test or after artificial sweat, thermal shock or boiling water, the pull-out force between the pressure-sensitive adhesive film and the substrate on the surface of the housings in Examples 1 to 3 is above 19 N / 24 mm, far greater than the industry standard of 15 N / 24 mm, indicating that the bonding force between the pressure-sensitive adhesive film and the substrate on the surface of the housing in the embodiments of the present application is very good; in addition, whether it is the initial pull-out force test or after artificial sweat, thermal shock or boiling water, there are no abnormalities such as blistering or peeling on the pressure-sensitive adhesive film on the surface of the housings in Examples 1 to 3, and the appearance has no change, which also indicates that the weather resistance of the pressure-sensitive adhesive film on the surface of the housing in the embodiments of the present application is very good; and, the pressure-sensitive adhesive films in Examples 1 and 2 are provided with the first and second pressure-sensitive adhesive film protection color-changing pressure-sensitive adhesive layers, so that the color-changing pressure-sensitive adhesive layer is not directly bonded to the substrate, so that the bonding force between the pressure-sensitive adhesive film and the substrate is better and the reliability is also better.

[0247] Furthermore, by comparing Example 1 with Comparative Example 1, it can be seen that the pull-out force between the pressure-sensitive adhesive film and the substrate in Comparative Example 1 is relatively low. After the reliability test (artificial sweat, thermal shock or boiling water), there are abnormalities such as blistering and peeling on the pressure-sensitive adhesive film in Comparative Example 1, indicating that the bonding force between the pressure-sensitive adhesive film containing only one acrylic resin with a relatively low Tg value and the substrate is poor and the reliability is also poor.

[0248] Furthermore, by comparing Example 1 with Comparative Example 2, it can be seen that the pull-out force between the pressure-sensitive adhesive film and the substrate in Comparative Example 2 is relatively low. After the reliability test (artificial sweat, thermal shock or boiling water), there are abnormalities such as blistering and peeling on the pressure-sensitive adhesive film in Comparative Example 2, indicating that the bonding force between the pressure-sensitive adhesive film containing only one acrylic resin with a relatively high Tg value and the substrate is poor and the reliability is also poor.

[0249] Furthermore, by comparing Example 1 with Comparative Example 3, it can be seen that the color-changing effect of the pressure-sensitive adhesive film in Comparative Example 3 is not obvious, indicating that for the pressure-sensitive adhesive film obtained from the glue without adding a dispersant, due to the poor dispersion of the color-developing particles, it is relatively difficult to achieve an obvious color-changing effect.

[0250] Furthermore, by comparing Example 1 with Comparative Example 4, it can be seen that the color-changing effect of the pressure-sensitive adhesive film in Comparative Example 4 is not obvious, indicating that for the pressure-sensitive adhesive film obtained from the glue without adding a color-developing aid, due to the poor dispersion of the color-developing particles, it is relatively difficult to achieve an obvious color-changing effect.

[0251] Furthermore, by comparing Example 1 with Comparative Example 5, it can be seen that the pressure-sensitive adhesive film in Comparative Example 5 has no obvious color-changing effect. The color-changing pressure-sensitive adhesive layer in Comparative Example 5 is not layered (nor partitioned) with different color-changing particles, so it is relatively difficult to achieve a color-changing effect.

[0252] References to "embodiments" and "implementation manners" in this document mean that specific features, structures, or characteristics described in connection with the embodiments may be included in at least one embodiment of the present application. The phrase appearing at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0253] Finally, it should be noted that the above implementation manners are only used to illustrate the technical solutions of the present application and not to limit them. Although the present application has been described in detail with reference to the above preferred implementation manners, those of ordinary skill in the art should understand that modifications or equivalent replacements of the technical solutions of the present application should not depart from the spirit and scope of the technical solutions of the present application.

Claims

1. A magic color shell, characterized in that, Comprising: A substrate; And A pressure-sensitive adhesive film, which is adhered to one side surface of the substrate; Wherein, a variety of color-developing particles are dispersed in the pressure-sensitive adhesive film, and the colors of the variety of color-developing particles are different. The pressure-sensitive adhesive film includes a color-changing pressure-sensitive adhesive layer, and the variety of color-developing particles are arranged in layers or regions in the color-changing pressure-sensitive adhesive layer. The glue forming the color-changing pressure-sensitive adhesive layer includes component A and component B. Component A includes a first solvent-based acrylic resin and a second solvent-based acrylic resin, and component B includes a curing agent. The glass transition temperature of the first solvent-based acrylic resin ranges from -45°C to -40°C, and the glass transition temperature of the second solvent-based acrylic resin ranges from -30°C to -20°C.

2. The iridescent housing according to claim 1, wherein, The pressure-sensitive adhesive film includes a first pressure-sensitive adhesive layer, the color-changing pressure-sensitive adhesive layer, and a second pressure-sensitive adhesive layer that are adhered to each other in sequence.

3. The iridescent housing according to claim 1, wherein Component A further includes: the color-developing particles, a color-developing particle orienting agent, an anti-settling agent, a dispersant, an ultraviolet light stabilizer, an ultraviolet absorber, and a color-developing assistant.

4. The iridescent housing according to claim 3, wherein, The content of each component in component A of the glue forming the color-changing pressure-sensitive adhesive layer and the mass ratio of each component in component A are as follows: The first solvent-based acrylic resin, 30% to 55%; The second solvent-based acrylic resin, 20% to 40%; The color-developing particles, 1% to 4%; The color-developing particle orienting agent, 1% to 2%; The anti-settling agent, 0.5% to 1%; The dispersant, 0.3% to 0.8%; The ultraviolet light stabilizer, 0.1% to 0.5%; The ultraviolet absorber, 0.1% to 0.5%; The color-developing assistant, 0.1% to 0.3%.

5. The iridescent housing according to claim 3, wherein, The dispersant is one or more of decyltrimethoxysilane, dodecyltrimethoxysilane, and tetradecyltrimethoxysilane.

6. The iridescent housing according to claim 3, characterized in that, The color-developing particles are selected from one or more of copper oxide, titanium dioxide, tin oxide, aluminum powder, lithium oxide, tungsten oxide, niobium oxide, molybdenum oxide, chromium oxide, manganese oxide, vanadium oxide, nickel oxide, zirconium oxide, iridium oxide, and iron oxide; the color-developing assistant is selected from one or more of mica, silica, and calcium carbonate.

7. The iridescent housing according to claim 6, characterized in that, The color of the pressure-sensitive adhesive film at one viewing angle is golden. Among them, the color-changing pressure-sensitive adhesive layer includes a first color-changing pressure-sensitive adhesive sub-layer, and the variety of color-developing particles in the first color-changing pressure-sensitive adhesive sub-layer and the mass fraction of each color-developing particle in the total color-developing particles are as follows: Copper oxide, 88.2% ± 1%; Titanium dioxide, 1.2% ± 0.1%; Tungsten oxide, 0.4% ± 0.1%; Vanadium oxide, 0.1% ± 0.05%; Iridium oxide, 10.1% ± 1%.

8. The iridescent housing according to claim 6, wherein, The color of the pressure-sensitive adhesive film at one viewing angle is champagne. Among them, the color-changing pressure-sensitive adhesive layer includes a second color-changing pressure-sensitive adhesive sub-layer, and the variety of color-developing particles in the second color-changing pressure-sensitive adhesive sub-layer and the mass fraction of each color-developing particle in the total color-developing particles are as follows: Copper oxide, 66% ± 1%; Titanium dioxide, 3% ± 0.1%; Aluminum powder, 0.3% ± 0.1%; Manganese oxide, 0.3% ± 0.1%; Tungsten oxide, 10% ± 1%; Vanadium oxide, 2% ± 0.1%; Zirconium oxide, 0.5% ± 0.1%; Iridium oxide, 17.9% ± 1%.

9. The iridescent housing according to claim 6, wherein, The color of the pressure-sensitive adhesive film is blue from a certain perspective. Among them, the color-changing pressure-sensitive adhesive layer includes a third color-changing pressure-sensitive adhesive sub-layer, and the various color-developing particles in the third color-changing pressure-sensitive adhesive sub-layer and the mass fraction of each color-developing particle in the total color-developing particles are as follows: Titanium dioxide, 5% ± 0.1%; Aluminum powder, 0.5% ± 0.1%; Manganese oxide, 0.1% ± 0.05%; Tungsten oxide, 12% ± 1%; Vanadium oxide, 59.5% ± 1%; Zirconium oxide, 2% ± 0.1%; Iridium oxide, 20.9% ± 1%.

10. The iridescent housing according to claim 2, wherein, The main components of the glue for forming the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer are also the first solvent-based acrylic resin and the second solvent-based acrylic resin.

11. The iridescent housing according to claim 2, wherein, The total thickness of the pressure-sensitive adhesive film is 25 to 75 microns; the thickness of the first pressure-sensitive adhesive layer is 5 to 25 microns, the thickness of the color-changing pressure-sensitive adhesive layer is 10 to 35 microns, and the thickness of the second pressure-sensitive adhesive layer is 5 to 25 microns.

12. The iridescent housing according to claim 1, wherein, It further includes: A color layer and a decorative texture layer provided between the substrate and the pressure-sensitive adhesive film, and an optical film layer and a cover bottom layer provided on the side of the pressure-sensitive adhesive film away from the substrate.

13. A method for preparing the iridescent housing according to any one of claims 1 to 12, characterized in that, It includes: Providing a substrate; Preparing a pressure-sensitive adhesive film; wherein, a variety of color-developing particles are dispersed in the pressure-sensitive adhesive film, the colors of the various color-developing particles are different, and the various color-developing particles are arranged in layers or regions in the pressure-sensitive adhesive film; Bonding the pressure-sensitive adhesive film to one surface of the substrate to obtain the colorful shell.

14. The preparation method of the iridescent shell according to claim 13, wherein, The steps of preparing the pressure-sensitive adhesive film include: Coating a first pressure-sensitive adhesive glue on a release paper and curing to obtain a first pressure-sensitive adhesive layer; Coating a pressure-sensitive adhesive glue containing color-developing particles on the first pressure-sensitive adhesive layer and curing to obtain a color-changing pressure-sensitive adhesive layer; Coating a second pressure-sensitive adhesive glue on the surface of the color-changing pressure-sensitive adhesive layer and curing to obtain a second pressure-sensitive adhesive layer; Removing the release paper to obtain the pressure-sensitive adhesive film.

15. A magic color-changing pressure-sensitive tape, characterized in that, It includes: Release paper; and A pressure-sensitive adhesive film formed on one surface of the release paper; wherein, a variety of color-developing particles are dispersed in the pressure-sensitive adhesive film, the colors of the various color-developing particles are different, the pressure-sensitive adhesive film includes a color-changing pressure-sensitive adhesive layer, and the various color-developing particles are arranged in layers or regions in the color-changing pressure-sensitive adhesive layer. The glue for forming the color-changing pressure-sensitive adhesive layer includes component A and component B. Component A includes a first solvent-based acrylic resin and a second solvent-based acrylic resin, and component B includes a curing agent. The glass transition temperature range of the first solvent-based acrylic resin is -45°C to -40°C, and the glass transition temperature range of the second solvent-based acrylic resin is -30°C to -20°C.

16. An electronic device, characterized in that, The electronic device includes a display screen and a colorful shell as described in any one of claims 1 to 12 provided on the back of the display screen, or a colorful shell prepared by the preparation method of the colorful shell as described in claim 13 or 14. The colorful shell is provided with a receiving cavity, and a battery assembly is received in the receiving cavity.

Images