Resin material and preparation and application thereof

Abstract

The invention provides a resin material and preparation and application thereof, the resin material comprises a body layer, the body layer comprises at least one structural color layer and a first resin layer located on at least one side of each structural color layer; the second resin layer is positioned on at least one side of the body layer; and the second resin layer comprises second water-based resin, a binder and an inorganic material additive. The adhesive force, environmental reliability and other properties of the resin material can be improved.

Description

Technical Field

[0001] The present invention relates to the field of optical materials, and particularly relates to a resin material and its preparation and application. Background Art

[0002] With the rapid development of science and technology, decorative materials have become a ubiquitous and essential material in daily life. Decorative materials can be used in various scenarios, such as the exterior of mobile phones, the shells of household appliances, the exterior paint and interior parts of cars, etc. They can not only enhance the beauty of products but also play a protective role. Decorative materials have different types and requirements in different scenarios. For example, in the automotive field, decorative materials are mainly applied to the interior and exterior of cars, etc. In the field of electronic products such as mobile phones, decorative materials are mainly applied to the housings of electronic products (such as mobile phone battery covers) and screen protectors, etc. Currently, traditional single decorative materials such as plastics, metals, and glasses can no longer meet the needs of consumers in terms of high-end, personalized, environmental protection, etc. Therefore, the development of new decorative materials has become an inevitable trend.

[0003] Structural color materials can present rich color effects and have broad application prospects in the field of decorative materials. However, in related technologies, the adhesion and environmental reliability of structural color materials are poor and urgently need to be improved. Summary of the Invention

[0004] The present invention provides a resin material and its preparation and application, which can improve the adhesion and environmental reliability of the resin material and effectively overcome the defects existing in the prior art.

[0005] On the one hand, the present invention provides a resin material, including: a body layer, the body layer includes at least one structural color layer and a first resin layer located on at least one side of each structural color layer; a second resin layer located on at least one side of the body layer; the second resin layer includes a second aqueous resin, a binder, and an inorganic material additive.

[0006] According to an embodiment of the present invention, the structural color layer includes a photonic crystal layer.

[0007] According to an embodiment of the present invention, the photonic crystal layer includes photonic crystal microspheres, and the photonic crystal microspheres include organic material microspheres.

[0008] According to an embodiment of the present invention, the organic material microspheres include one or more of polystyrene (PS), polymethyl methacrylate (PMMA), styrene-butyl acrylate-acrylic acid (PS-BA-AA) copolymer, polyacrylamide (PAM), poly(styrene-methacrylic acid) (P(St-MAA)), poly(styrene-acrylic acid) (P(St-AA)), poly(styrene-hydroxyethyl acrylate) (P(St-HEA)), and poly(styrene-methyl methacrylate) (P(St-MMA)).

[0009] According to an embodiment of the present invention, the structural color layer includes one or more of a surfactant, a first defoaming agent, a pH regulator, and a first ultraviolet absorber.

[0010] According to an embodiment of the present invention, the surfactant includes an anionic surfactant; and / or, the pH regulator includes an organic amine.

[0011] According to an embodiment of the present invention, the anionic surfactant includes sodium dodecyl sulfate; and / or, the organic amine includes triethanolamine.

[0012] According to an embodiment of the present invention, the first resin layer includes a first waterborne resin, and the first waterborne resin includes one or more of a waterborne phenolic resin, a waterborne epoxy resin, a waterborne acrylic resin, an organosilicon resin, an organoboron resin, and a fluororesin.

[0013] According to an embodiment of the present invention, the first resin layer includes a second defoaming agent and / or a second ultraviolet absorber.

[0014] According to an embodiment of the present invention, the second waterborne resin includes a waterborne acrylic resin; and / or, the binder includes ethyl 2-hydroxymethacrylate; and / or, the inorganic material additive includes iron oxide black.

[0015] According to an embodiment of the present invention, the first resin layer penetrates into at least a partial region of the structural color layer.

[0016] According to an embodiment of the present invention, the first resin layer is present between the second resin layer and the structural color layer.

[0017] According to an embodiment of the present invention, the body layer includes at least two layers of the structural color layer stacked, and the first resin layer is present between each adjacent two layers of the structural color layer.

[0018] According to an embodiment of the present invention, it further includes a substrate, the substrate is located on one side surface of the body layer, and the second resin layer is located on the other side surface of the body layer.

[0019] According to an embodiment of the present invention, the substrate includes one or more of glass, acrylic, metal, ceramic, and epoxy composite materials.

[0020] On the other hand, the present invention provides a method for preparing the aforementioned resin material, comprising the following steps: providing a substrate; alternately coating a first mixed solution for forming the structural color layer and a second mixed solution for forming the first resin layer on the substrate to form the body layer; wherein, after each coating, it is dried first and then the next coating is carried out; coating a third mixed solution for forming the second resin layer on the side of the body layer facing away from the substrate, and after drying, the resin material is obtained.

[0021] According to an embodiment of the present invention, the first mixed solution includes components with the following mass fractions: 10 - 30% of photonic crystal microspheres, 3 - 18% of a first humectant, 0.5 - 1.5% of a surfactant, 1 - 2% of a first defoaming agent, 0.05 - 0.15% of a pH regulator, 0.05 - 0.15% of a first ultraviolet absorber, and the balance of water; wherein, the first humectant includes one or more of ethylene glycol, isopropanol, and glycerol; and / or, the second mixed solution includes components with the following mass fractions: 10 - 40% of a first aqueous resin, 0.5 - 10% of a second humectant, 1 - 2% of a second defoaming agent, 0.05 - 2% of a second ultraviolet absorber, and the balance of organic solvents; wherein, the second humectant includes one or more of ethylene glycol, isopropanol, and glycerol; and / or, the third mixed solution includes components with the following mass fractions: 10 - 20% of a second aqueous resin, 1 - 5% of a binder, 5 - 15% of an inorganic material additive, and the balance of water.

[0022] On yet another aspect, the present invention provides a structural member including the aforementioned resin material.

[0023] According to an embodiment of the present invention, the structural member includes a mobile phone, a tablet computer, a wearable device, a smart home appliance device, or a power device.

[0024] The resin material provided by the present invention has a structural color layer in the main body layer that can achieve rich color effects. The first resin layer located on at least one side of the structural color layer can protect the structural color layer and stabilize the overall structure of the main body layer. At the same time, a second resin layer with a specific composition is used to form the surface layer, which can protect the main body layer and improve the strength of the resin material. Thus, the present invention can improve the performance of the resin material such as adhesion and environmental reliability, enabling the resin material to have both rich and adjustable color effects, as well as excellent adhesion and environmental reliability. Specifically, it can be manifested in the following aspects: (1) The film layers of the resin material are not easily peeled off under the action of external tensile force; (2) Even in an environment of high temperature (such as about 55 °C and above) and high humidity (such as about 95% RH and above), abnormal phenomena such as blistering, wrinkling, and peeling are not likely to occur on the surface of the resin material, and good adhesion can still be maintained, and the film layers of the resin material are not easily peeled off under the action of external tensile force; (3) Even under cyclic thermal shock (such as cycling through a low-temperature environment of about -40 °C ± 2 °C for 1 h and a high-temperature environment of 70 °C ± 2 °C for 1 h, and performing 24 or more cycles in total), abnormal phenomena such as blistering, wrinkling, and peeling are not likely to occur on the surface of the resin material, and good adhesion can still be maintained, and the film layers of the resin material are not easily peeled off under the action of external tensile force; (4) Even after being boiled in hot water at a high temperature (such as boiled in water at 80 °C ± 2 °C for about 30 min), abnormal phenomena such as blistering, wrinkling, and peeling are not likely to occur on the surface of the resin material, and good adhesion can still be maintained, and the film layers of the resin material are not easily peeled off under the action of external tensile force. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of the resin material of Embodiment 1 of the present invention;

[0026] Figure 2 It is a schematic structural diagram of the resin material of Embodiment 2 of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] To enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below. The following specific embodiments listed are only for describing the principles and features of the present invention, and the examples given are only used to explain the present invention and do not limit the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] Embodiments of the present invention provide a resin material, such as Figure 1 and Figure 2As shown in the figure, the resin material includes: a body layer, the body layer includes at least one structural color layer 3, and a first resin layer 1 located on at least one side of each structural color layer 3; a second resin layer 2, located on at least one side of the body layer; the second resin layer 2 includes a second aqueous resin, a binder, and an inorganic material additive.

[0029] The resin material provided by the embodiment of the present invention is a structural color composite material. The structural color layer 3 in its body layer can achieve rich color effects. The first resin layer 1 located on at least one side of the structural color layer 3 can protect the structural color layer 3 and stabilize the overall structure of the body layer. At the same time, a surface layer is formed by using the second resin layer 2 with a specific composition, which can protect the body layer and improve the strength of the resin material. Therefore, the present invention can improve the performance such as the adhesion and environmental reliability of the resin material, making the resin material have both rich and adjustable color effects, as well as excellent adhesion and environmental reliability and other properties.

[0030] Specifically, the resin material of the embodiment of the present invention can be a color-changing material, and the physical color presented by it can change with the viewing angle (that is, when observed from different angles, it can present different color effects).

[0031] Specifically, the above-mentioned structural color layer 3 can generate physical structural colors, thus presenting rich color effects. In some embodiments, the structural color layer 3 may include a photonic crystal layer 3. The photonic crystal layer 3 has a periodic dielectric structure formed by the periodic arrangement of photonic crystal microspheres 31. Its most basic feature is the presence of a photonic bandgap. Due to the existence of the photonic bandgap, visible light equivalent to the bandgap can be blocked (that is, visible light with a wavelength equivalent to the bandgap cannot pass through this photonic crystal structure), and thus is selectively reflected, and then coherent diffraction is formed on the surface of the periodically arranged photonic crystals, generating a structural color effect.

[0032] As described above, the photonic crystal layer 3 includes photonic crystal microspheres 31. The photonic crystal microspheres 31 are periodically arranged in the photonic crystal layer 3 to form a photonic crystal layer 3 with a periodic dielectric structure. The photonic crystal microspheres 31 are usually nanomaterials, that is, their particle size is at the nanometer level, for example, 100nm - 400nm, such as 100nm, 150nm, 200nm, 250nm, 300nm, 350nm, 400nm or any range composed of any two of them, but not limited thereto.

[0033] Specifically, each photonic crystal layer 3 includes a plurality of photonic crystal microspheres 31. The particle sizes of these photonic crystal microspheres 31 can be the same or different, that is, each photonic crystal layer 3 can include photonic crystal microspheres 31 of one particle size, or include at least two different particle sizes of photonic crystal microspheres 31.

[0034] Exemplarily, any layer of the photonic crystal layer 3 may include one or more of the photonic crystal microspheres 31 with a particle size of 246 nm, 265 nm, and 293 nm.

[0035] Specifically, the above-mentioned photonic crystal microspheres 31 may include organic material microspheres. According to the research and analysis of the inventors, in the resin material of the invention embodiment, using organic material microspheres to form the photonic crystal layer 3 is more conducive to cooperating with structures such as the first resin layer 1, etc., while achieving rich color effects, further improving the adhesion and environmental reliability of the resin material and other properties.

[0036] In some embodiments, the organic material microspheres may include one or more of polystyrene (PS), polymethyl methacrylate (PMMA), styrene-butyl acrylate-acrylic acid (PS-BA-AA) copolymer, polyacrylamide (PAM), poly(styrene-methacrylic acid) (P(St-MAA)), poly(styrene-acrylic acid) (P(St-AA)), poly(styrene-hydroxyethyl acrylate) (P(St-HEA)), poly(styrene-methyl methacrylate) (P(St-MMA)).

[0037] Exemplarily, the organic material microspheres may include one or more of polystyrene microspheres, polymethyl methacrylate microspheres, styrene-butyl acrylate-acrylic acid copolymer microspheres, polyacrylamide microspheres, poly(styrene-methacrylic acid) microspheres, poly(styrene-acrylic acid) microspheres, poly(styrene-hydroxyethyl acrylate) microspheres, poly(styrene-methyl methacrylate) microspheres.

[0038] In addition, the above-mentioned structural color layer 3 (photonic crystal layer 3) may also include one or more of a surfactant, a first defoaming agent, a pH regulator, and a first ultraviolet absorber. During specific implementation, a first mixed solution containing components such as photonic crystal microspheres 31, a surfactant, a first defoaming agent, a pH regulator, a first ultraviolet absorber, and water (solvent) may be coated on the substrate 4, and then dried. During the drying process, the photonic crystal microspheres 31 perform self-assembly to form the photonic crystal layer 3.

[0039] Specifically, the introduction of the surfactant is more conducive to the formation of the photonic crystal layer 3. The surfactant may include an anionic surfactant, and the anionic surfactant may specifically include sodium dodecyl sulfate. By using an anionic surfactant, it is more conducive to cooperating with each component and further optimizing the performance of the resin material.

[0040] Specifically, the introduction of the pH regulator is more conducive to the formation of the photonic crystal layer 3. The pH regulator may include organic amines, and the organic amines include, for example, alkanolamines, preferably triethanolamine.

[0041] Specifically, introducing a first ultraviolet absorber into the photonic crystal layer 3 can absorb ultraviolet rays, prevent adverse phenomena such as aging of the resin material, and further optimize the performance of the resin material. The first ultraviolet absorber in the embodiments of the present invention can be a conventional ultraviolet absorber in the art, and no special limitation is imposed thereon.

[0042] Specifically, introducing a first defoaming agent into the photonic crystal layer 3 is conducive to eliminating bubbles in the first mixed liquid used to form the photonic crystal layer 3, thereby being more conducive to the formation and performance of the photonic crystal layer 3. The first defoaming agent in the embodiments of the present invention can be a conventional defoaming agent in the art, and no special limitation is imposed thereon either.

[0043] In addition, the first resin layer 1 may include a first water-based resin, and the first water-based resin includes one or more of water-based phenolic resin, water-based epoxy resin, water-based acrylic resin, silicone resin, organoboron resin, and fluororesin, which can further improve the adhesion and environmental reliability of the resin material.

[0044] In addition, the first resin layer 1 may further include a second defoaming agent and / or a second ultraviolet absorber.

[0045] Specifically, introducing a second ultraviolet absorber into the first resin layer 1 can absorb ultraviolet rays, prevent adverse phenomena such as aging of the resin material, and further optimize the performance of the resin material. The second ultraviolet absorber in the embodiments of the present invention can be a conventional ultraviolet absorber in the art, and no special limitation is imposed thereon.

[0046] Specifically, introducing a second defoaming agent into the first resin layer 1 is conducive to eliminating bubbles in the second mixed liquid used to form the photonic crystal layer 3, thereby being more conducive to the formation and performance of the first resin layer 1. The first defoaming agent in the embodiments of the present invention can be a conventional defoaming agent in the art, and no special limitation is imposed thereon either.

[0047] Generally, as Figure 1 and Figure 2 shown, in the photonic crystal layer 3, the photonic crystal microspheres 31 are closely arranged, that is, two adjacent photonic crystal microspheres 31 are substantially in contact. At the same time, there are also voids 30 in the photonic crystal layer 3, and the voids 30 exist between the photonic crystal microspheres 31.

[0048] Continue to refer to Figure 1 and Figure 2, the first resin layer 1 can penetrate into at least part of the structural color layer 3, that is, the first resin layer 1 includes a covering portion 11 existing on the surface of the structural color layer 3 and a filling portion filled in the photonic crystal layer 3, and this filling portion is specifically filled in the voids 30 of the photonic crystal layer 3. That is to say, the material of the first resin layer 1 (such as the first aqueous resin, the second defoaming agent, and the second ultraviolet absorber, etc.) will penetrate into the voids 30 of at least part of the region of the photonic crystal layer 3, so that the photonic crystal layer 3 also contains the material of the first resin layer 1. By infiltrating and filling the photonic crystal layer 3 with a high-strength material (the first resin layer 1) and cooperating with the second resin layer 2 for surface protection, it is beneficial to further improve the properties such as the strength of the resin material.

[0049] During specific implementation, the second mixed solution of components such as the first aqueous resin, the second defoaming agent, the second ultraviolet absorber, and the organic solvent can be coated on the photonic crystal layer 3, and then dried to form the first resin layer 1.

[0050] In addition, in the second resin layer 2, the second aqueous resin can include an aqueous acrylic resin, which is beneficial to further improve the properties such as the adhesion and environmental reliability of the resin material.

[0051] In addition, the binder can include ethyl 2-hydroxyethyl methacrylate, which is beneficial to further improve the properties such as the adhesion and environmental reliability of the resin material.

[0052] In addition, the inorganic material additive can include an inorganic pigment, specifically, it can include iron oxide black, so that while improving the adhesion and environmental reliability of the resin material, the properties such as the brightness and color saturation of the resin material can be further optimized.

[0053] Continue to refer to Figure 1 and Figure 2 , the resin material is a laminated material, and the main body layer (structural color layer 3 and the first resin layer 1) and the second resin layer 2 and other structures are laminated (stacked) along the thickness direction of the resin material.

[0054] Specifically, there is a first resin layer 1 between the second resin layer 2 and the structural color layer 3, specifically, it can be the covering portion 11 of the first resin layer 1. This can further improve the properties such as the adhesion and environmental reliability of the resin material, while maintaining its rich color effect.

[0055] Specifically, the main body layer can include one structural color layer 3 (as shown in Figure 1 ) or at least two structural color layers 3 (as shown in Figure 2 ). When the main body layer includes at least two structural color layers 3, these structural color layers 3 are laminated (stacked) along the thickness direction of the resin material, and there is a first resin layer 1 between each adjacent two photonic crystal layers 3 (as shown in Figure 2 ).

[0056] Among them, when the main body layer includes at least two structural color layers 3, the composition of every two photonic crystal layers 3 (such as parameters such as the material, particle size and content of the photonic crystal microspheres 31, and the materials and contents of other components) can be the same or different, and the thickness of every two photonic crystal layers 3 can be the same or different. For example, the thickness ratio of any two photonic crystal layers 3 can be 1:(0.5 - 5), such as 1:1, 1:1.5, 1:2, 1:3, 1:3.5, 1:4, 1:4.5, 1:5 or the range composed of any two of them.

[0057] Specifically, in the main body layer, the number of the first resin layers 1 and the photonic crystal layers 3 can be the same. When the main body layer includes at least two first resin layers 1, the composition of every two first resin layers 1 (such as parameters such as the material of components such as the first aqueous resin and its content) can be the same or different.

[0058] Continue to refer to Figure 1 and Figure 2 , the resin material may further include a substrate 4. The substrate 4 is located on one side surface of the main body layer, and the second resin layer 2 is located on the other side surface of the main body layer, that is, the main body layer is located between the substrate 4 and the second resin layer 2.

[0059] Specifically, as Figure 1 and Figure 2 shown, the substrate 4 can be in direct contact with the photonic crystal layer 3 in the main body layer, that is, there is no coating such as the first resin layer 1 between the substrate 4 and the photonic crystal layer 3.

[0060] Exemplarily, as Figure 1 shown, the resin material includes a substrate 4, a photonic crystal layer 3, a first resin layer 1, and a second resin layer 2 that are stacked in sequence.

[0061] Exemplarily, as Figure 2 shown, the resin material includes a substrate 4, a photonic crystal layer 3, a first resin layer 1, a photonic crystal layer 3, a first resin layer 1, and a second resin layer 2 that are stacked in sequence.

[0062] Specifically, the surface of the above-mentioned substrate 4 (for example, the side facing the main body layer) can include a plane and / or a curved surface (or called an arc surface), that is, it can be a plane, or a curved surface, or part of the area is a plane and part of the area is a curved surface, or it can be other regular or irregular surfaces (special-shaped surfaces), and no special limitation is made thereto.

[0063] The embodiments of the present invention can adopt a variety of substrates 4 to achieve the structural color effect on a variety of substrates 4. In some specific embodiments, the substrate 4 can include one or more of glass, acrylic material, metal, ceramic, and epoxy composite material.

[0064] The resin material provided by the embodiment of the present invention has rich and adjustable colors, and the color can be adjusted in multiple dimensions. For example, different color effects can be achieved by adjusting the particle size of the photonic crystal microspheres 31, the thickness of the photonic crystal layer 3, the number of layers of the photonic crystal layer 3, and the thickness ratio of different photonic crystal layers 3, for example, making it present red, green, blue or other color effects. In specific implementation, the appearance color effect of the resin material can be directly observed, and the arrangement of the photonic crystal microspheres 31 in the resin material, the spacing (the spacing is basically equal to the distance between the centers of two adjacent photonic crystal microspheres 31) and the size of the photonic crystal microspheres 31, and the characteristics of the film layers such as the photonic crystal layer 3 and the number of layers thereof can be determined by scanning electron microscopy (SEM) analysis.

[0065] An embodiment of the present invention also provides a method for preparing the aforementioned resin material, comprising the following steps: providing a substrate 4; alternately coating the substrate 4 with a first mixed liquid for forming a structural color layer 3 and a second mixed liquid for forming a first resin layer 1 to form a main body layer; wherein after each coating is completed, drying is performed before the next coating; coating the main body layer with a third mixed liquid for forming a second resin layer 2 on the side away from the substrate 4, and obtaining a resin material after drying.

[0066] Specifically, the first mixed liquid can be a mixed liquid for forming the photonic crystal layer 3, and the first mixed liquid can specifically include the following components in mass fractions: photonic crystal microspheres 31 (latex balls) 10-30%, a first moisturizing agent 3-18%, a surfactant 0.5-1.5%, a first defoaming agent 1-2%, a pH adjuster 0.05-0.15%, a first ultraviolet absorber 0.05-0.15%, and the remainder water, and each component is uniformly dispersed or dissolved therein.

[0067] In the first mixed solution, the monodispersity index PDI of the photonic crystal microspheres 31 is less than or equal to 0.05, for example, 0.05, 0.04 or 0.03.

[0068] The introduction of the first humectant can adjust the drying speed of the first mixed solution during the drying process after coating, thereby facilitating the arrangement of the photonic crystal microspheres 31 to form the photonic crystal layer 3. The first humectant can include alcohols, specifically one or more of ethylene glycol, isopropyl alcohol and glycerol.

[0069] In addition, the second mixed liquid may include the following components in mass fractions: 10-40% of a first aqueous resin, 0.5-10% of a second moisturizer, 1-2% of a second defoamer, 0.05-2% of a second ultraviolet absorber, and the remainder of an organic solvent, wherein each component is uniformly dissolved or dispersed therein.

[0070] The organic solvent may include an alcohol solvent, such as ethanol and / or isopropanol.

[0071] Specifically, after the second mixture is coated on the photonic crystal layer 3, it partially penetrates into the voids 30 of the photonic crystal layer 3, so that the formed first resin layer 1 includes a covering portion 11 existing on the surface of the photonic crystal layer 3 and a filling portion filled in the photonic crystal layer 3.

[0072] Among them, the second moisturizer can regulate the drying speed of the second mixture during the drying process after coating, so as to facilitate the penetration of the second mixture into the photonic crystal layer 3 and improve the bonding strength between the photonic crystal layer 3 and the first resin layer 1; at the same time, since the second mixture coated on the surface of the photonic crystal layer 3 will penetrate into the photonic crystal layer 3, therefore, by introducing the second moisturizer into the second mixture, the drying speed of the second mixture during the drying process is regulated, so as to facilitate the arrangement of the photonic crystal microspheres 31 and form the photonic crystal layer 3. Thus, by introducing the second moisturizer, the adhesion and environmental reliability of the obtained resin material can be further improved.

[0073] Specifically, the second moisturizer may include alcohols, specifically one or more of ethylene glycol, isopropanol, and glycerol, and the second moisturizer may be the same as or different from the first moisturizer.

[0074] In addition, the third mixture may include the following components in mass fractions: 10-20% of the second aqueous resin, 1-5% of the binder, 5-15% of the inorganic material additive, and the balance of water, and each component is uniformly dissolved or dispersed therein.

[0075] Generally, in the above preparation process, after drying, the first moisturizer, the second moisturizer, the water in the first mixture, the organic solvent in the second mixture, and the water in the third mixture will volatilize, and usually volatilize completely.

[0076] During specific implementation, the substrate 4 can be first cleaned to remove the contaminants on its surface, and then corona treatment can be carried out by using an industrial corona device to make the water contact angle on its surface (i.e., the contact angle with pure water) less than 30°, and then the first mixture and the second mixture are alternately coated.

[0077] Exemplarily, when the substrate 4 is glass, the substrate 4 can be cleaned with acetone and / or an inorganic base solution with a mass fraction of 3-7% (such as sodium hydroxide solution).

[0078] Exemplarily, when the substrate 4 is an acrylic material (such as an acrylic board), the substrate 4 can be cleaned with water or other cleaning agents.

[0079] In the above preparation process, the first mixture and the second mixture are alternately coated on the substrate 4, and after each coating is completed, it is dried first and then the next coating is carried out to obtain the body layer.

[0080] Specifically, the preparation process of the body layer includes: S1. First, coat the first mixed solution on the substrate 4, and then perform the first drying to form the photonic crystal layer 3; S2. Coat the second mixed solution on the photonic crystal layer 3, and then perform the second drying to form the first resin layer 1; where when the body layer includes at least two photonic crystal layers 3, repeat steps S1 and S2 until all the photonic crystal layers 3 and the first resin layer 1 are formed (there is a first resin layer 1 on the side of the photonic crystal layer 3 farthest from the substrate 4 that faces away from the substrate 4), thus obtaining the body layer. After obtaining the body layer, coat the third mixed solution on the surface of the body layer that faces away from the substrate 4, and then perform the third drying to form the second resin layer 2, thus obtaining the resin material.

[0081] Specifically, in the above preparation process, the conditions for the coating process of each step (the process of coating the first mixed solution, the process of coating the second mixed solution, and the process of coating the third mixed solution) can be: the temperature is 15°C to 30°C, for example, 15 to 25°C, and specifically can be room temperature; the humidity is 10% to 40%. When specifically implementing, the coating and drying and other processes can be carried out in a dust-free room with a temperature of 15°C to 30°C and a humidity of 10% to 40%.

[0082] Among them, the temperature of the first drying (i.e., the drying process of the first mixed solution) can be 20 to 30°C, specifically can be room temperature, and the humidity during the first drying process can be 10% to 40%. When specifically implementing, it can be naturally dried in a dust-free room environment. Under the above first drying temperature and humidity conditions, it is beneficial to realize the rapid self-assembly of polymer microspheres (i.e., photonic crystal microspheres 31) to form the photonic crystal layer 3.

[0083] Specifically, the time of the first drying can be 10 to 60 minutes, such as 10 minutes, 15 minutes, 20 minutes, 25 minutes, 30 minutes, 35 minutes, 40 minutes, 45 minutes, 50 minutes, 55 minutes, 60 minutes, or the range composed of any two of them.

[0084] In addition, the process of the second drying can include: naturally drying in a dust-free room environment for 10 to 60 minutes (such as 30 minutes), then putting it into a drying device such as a blast drying oven, first drying at 50 to 80°C (such as 60°C) for 5 to 15 minutes (such as 10 minutes), then drying at 80 to 100°C (such as 90°C) for 5 to 15 minutes (such as 10 minutes), and it can also be further selected (or not selected) to dry at 110 to 130°C (such as 120°C) for 5 to 15 minutes (such as 10 minutes). After the drying is completed, take it out of the drying device and place it in the dust-free room for cooling (i.e., natural drying) to form the first resin layer 1. Through this second drying process, the second mixed solution coated on the surface of the photonic crystal layer 3 is thermally cured, which is beneficial to realize the high-strength adhesion of the first resin layer 1.

[0085] In addition, the process of the third drying may include: naturally drying for 20 - 40 minutes (such as 30 minutes) in a clean room environment, then putting it into a drying device such as a blast drying oven, first drying at 50 - 70°C (such as 60°C) for 5 - 15 minutes (such as 10 minutes), then drying at 80 - 100°C (such as 90°C) for 20 - 40 minutes (such as 30 minutes), and then taking it out of the drying device and placing it in the clean room for cooling (i.e., natural drying) to form the first resin layer 1. Through this third drying process, the third mixed solution coated on the surface of the first resin layer 1 is thermally cured, which is beneficial to achieving high-strength adhesion of the second resin layer 2.

[0086] As described above, the environmental conditions of the clean room can be: the temperature is 15°C - 30°C, and the humidity is 10% - 40%.

[0087] The embodiments of the present invention can adopt a variety of mass production processes to achieve the above coating. For example, coating can be carried out through technologies such as spraying, scraping, and dispensing to meet the requirements of batch preparation of resin materials.

[0088] The preparation method of the resin material provided by the embodiments of the present invention is convenient for adjusting the formula by using a mixed solution with a corresponding composition, and is suitable for different construction processes. In particular, processes such as spraying and scraping, which are commonly used and inexpensive in the field of decorative materials, can be adopted. It has the advantages of low cost, convenient operation, good operability for large areas, and can achieve the formation of large-area coatings. At the same time, by adopting a combination of multi-layer coatings, the preparation of a resin material with excellent properties such as rich and adjustable colors, strong material reliability, adhesion, and environmental reliability is realized.

[0089] The resin material of the embodiments of the present invention can be used as a decorative material and applied to a variety of devices, such as smart terminals such as mobile phones, tablet computers (PCs), wearable devices, smart home appliances, or power devices (such as cars).

[0090] The embodiments of the present invention also provide a structural member, including the aforementioned resin material, which has the corresponding advantages of the aforementioned resin material and will not be elaborated herein.

[0091] Specifically, the structural member can include smart terminals such as mobile phones, tablet computers (PCs), wearable devices, smart home appliances, or power devices (such as cars).

[0092] Specifically, on the one hand, in the related art, the phenomenon of homogenization of the appearance colors of terminal products such as mobile phones is common. By using the resin material (laminated color-changing material) of the embodiments of the present invention, more design spaces can be provided for the CMF appearance ID effects of terminal products such as mobile phones, enriching their color effects. On the other hand, the resin material of the embodiments of the present invention has properties such as good adhesion and environmental reliability, can meet the performance requirements of terminal products such as mobile phones for being thin, light, high-strength, high-toughness, high-transparency, high-saturation, etc., and can withstand the influence of environmental factors such as high temperature and low temperature.

[0093] In addition, compared with traditional coloring schemes, the photonic crystal of the resin material of the embodiments of the present invention does not require the use of pigments and also has the advantages of being safe and environmentally friendly, and can be used in environments such as indoors or outdoors.

[0094] The present invention is further introduced below through specific embodiments. The polystyrene emulsion used in the following embodiments is formed by dispersing polystyrene microspheres (monodisperse latex spheres) in water. The mass fraction of the polystyrene microspheres (i.e., the ratio of the mass of polystyrene in the polystyrene emulsion to the total mass of the polystyrene emulsion) is 45%, and the monodispersity index PDI of the polystyrene microspheres is 0.04.

[0095] In the following embodiments, the mixed solutions 1 to 8 are prepared respectively according to the following procedures:

[0096] (1) At room temperature, polystyrene emulsion (microsphere diameter is 246 nm), solvent (deionized water), and additives (ethylene glycol, sodium dodecyl sulfonate, defoamer, triethanolamine, ultraviolet absorber) are sequentially added to a container to obtain mixed solution 1 (i.e., the first mixed solution, and its composition is specifically shown in Table 1);

[0097] (2) At room temperature, solvent (ethanol), additives (ethylene glycol, isopropanol, defoamer, and ultraviolet absorber), and waterborne phenolic resin are sequentially added to a container to obtain mixed solution 2 (i.e., the second mixed solution, and its composition is specifically shown in Table 1);

[0098] (3) At room temperature, solvent (deionized water), additives (2-hydroxyethyl methacrylate and iron oxide black), and waterborne acrylic resin are sequentially added to a container, and are dispersed evenly by a high-speed disperser to obtain mixed solution 3 (i.e., the third mixed solution, and its composition is specifically shown in Table 1);

[0099] (4) At room temperature, polystyrene emulsion (microsphere diameter is 265 nm), solvent (deionized water), and additives (ethylene glycol, sodium dodecyl sulfonate, defoamer, triethanolamine, ultraviolet absorber) are sequentially added to a container to obtain mixed solution 4 (i.e., the first mixed solution, and its composition is specifically shown in Table 1);

[0100] (5) At room temperature, successively add a solvent (ethanol), additives (ethylene glycol, isopropyl alcohol, defoamer, and ultraviolet absorber), and a waterborne epoxy resin into a container to obtain a mixture 5 (i.e., the second mixture, and its composition is shown in Table 1 specifically);

[0101] (6) At room temperature, successively add a polystyrene emulsion (microsphere particle size is 246 nm), a solvent (deionized water), and additives (ethylene glycol, sodium dodecyl sulfonate, defoamer, triethanolamine, ultraviolet absorber) into a container to obtain a mixture 6 (i.e., the first mixture, and its composition is shown in Table 1 specifically);

[0102] (7) At room temperature, successively add a polystyrene emulsion (microsphere particle size is 293 nm), a solvent (deionized water), and additives (ethylene glycol, sodium dodecyl sulfonate, defoamer, triethanolamine, ultraviolet absorber) into a container to obtain a mixture 7 (i.e., the first mixture, and its composition is shown in Table 1 specifically);

[0103] (8) At room temperature, successively add a solvent (ethanol), additives (ethylene glycol, defoamer, and ultraviolet absorber), and a waterborne acrylic resin into a container to obtain a mixture 8 (i.e., the second mixture, and its composition is shown in Table 1 specifically).

[0104] Table 1

[0105]

[0106] Note: In Table 1, the mass fraction refers to the mass percentage content of the component in the mixture where it is located (i.e., the ratio of the mass of the component to the mass of the mixture where it is located).

[0107] Example 1

[0108] The structural schematic diagram of the resin material of this Example 1 is as Figure 1 shown, and the preparation process of this resin material is as follows:

[0109] 1. Prepare mixture 1, mixture 2, and mixture 3 respectively according to the above process;

[0110] 2. Pretreatment of the substrate (flat tempered glass)

[0111] Select a commercially available flat tempered glass (its specification is 40 cm * 40 cm * 5 mm, that is, 40 cm in length, 40 cm in width, and 5 mm in thickness), and thoroughly clean the surface of the flat tempered glass with acetone and a 5% sodium hydroxide aqueous solution by mass concentration; after cleaning, dry it, and then perform corona treatment on the surface of the flat tempered glass with an industrial corona device. Measure that the contact angle of the surface of the flat tempered glass with respect to pure water is less than 30° through a contact angle meter, and place the pretreated flat tempered glass in a dust-free room for standby;

[0112] 3. Spraying

[0113] In a dust-free room, control the temperature at 15°C to 25°C and the humidity at 10% to 40%. In this environment, use a commercially available spraying device (Iwata HP-CP airbrush, nozzle diameter 0.3 mm), in conjunction with a small pressure pump, to perform the following steps S101 to S103:

[0114] S101. Spraying Mixture 1

[0115] Take an airbrush, ensure it is clean, and fill it with Mixture 1;

[0116] At a distance of 20 cm from the flat tempered glass, continuously spray Mixture 1 on one surface of the flat tempered glass. The spraying effect should be such that Mixture 1 forms a liquid film on the glass surface but does not flow. The airbrush moves in a zigzag pattern for spraying and is completed in one go;

[0117] After spraying, allow it to dry naturally in the dust-free room environment for 30 min to form a photonic crystal layer;

[0118] S102. Spraying Mixture 2

[0119] Take another airbrush, ensure it is clean, and fill it with Mixture 2;

[0120] At a distance of 20 cm from the surface of the flat tempered glass that has been sprayed with Mixture 1 (i.e., the surface of the photonic crystal layer), continuously spray Mixture 2 on this surface. The spraying effect should be such that Mixture 2 forms a liquid film on the photonic crystal layer surface but does not flow. The airbrush moves in a zigzag pattern for spraying and is completed in one go (after spraying, it can be observed that the glass surface is transparent and has physical colors that change with the viewing angle);

[0121] Allow it to dry naturally in the dust-free room environment for 30 min, then place it in a forced-air drying oven. First, dry it at 60°C for 10 min, then at 90°C for 10 min, and then take it out of the forced-air drying oven and allow it to dry and cool naturally in the dust-free room to form the first resin layer;

[0122] S103. Spraying Mixture 3

[0123] Take another airbrush, ensure it is clean, and fill it with Mixture 3. At a distance of 20 cm from the surface of the flat tempered glass that has been sprayed with Mixture 2 (i.e., the surface of the first resin layer), continuously spray Mixture 3 on this surface. The spraying effect should be such that Mixture 3 completely covers the first resin layer. The airbrush moves in a zigzag pattern for spraying and is completed in one go (if the covering effect is not complete in one spraying, secondary or more sprayings can be carried out);

[0124] After spraying, it is naturally dried in a dust-free environment for 30 min, and then placed in a forced-air drying oven. It is dried at 60 °C for 10 min, at 90 °C for 10 min, and at 120 °C for 10 min in sequence. Then it is taken out from the forced-air drying oven and naturally dried and cooled in the dust-free environment to form a third resin layer, thereby obtaining a colored coated glass substrate (i.e., resin material).

[0125] Example 2

[0126] The structural schematic diagram of the resin material in this Example 2 is as shown in Figure 2 and the preparation process of this resin material is as follows:

[0127] 1. Prepare mixed solutions 1, 3, 4, and 5 respectively according to the above process;

[0128] 2. Pretreatment of the substrate (the same as that in Example 1, not described in detail again);

[0129] 3. Spraying

[0130] In a dust-free environment, control the temperature at 15 °C to 25 °C and the humidity at 10% to 40%. In this environment, use a commercially available spraying device (Iwata HP-CP airbrush (nozzle diameter is 0.3 mm), cooperate with a small pressure pump, and perform the following steps S201 to S205:

[0131] S201. The same as step S101 (forming the first photonic crystal layer);

[0132] S202. The difference from step S102 is that mixed solution 5 is used to replace mixed solution 2;

[0133] S203. The difference from step S201 is that mixed solution 4 is used to replace mixed solution 1, so as to spray mixed solution 4 on the surface of the flat glass that has been sprayed with mixed solution 1 and mixed solution 5 in sequence to form a second photonic crystal layer;

[0134] S204. Refer to the process of step S202 and spray mixed solution 5 on the surface of the flat glass that has been sprayed with mixed solution 1, mixed solution 5, and mixed solution 4 in sequence;

[0135] S205. Refer to the process of step S103 and spray mixed solution 3 on the surface of the flat glass that has been sprayed with mixed solution 1, mixed solution 5, mixed solution 4, and mixed solution 5 in sequence to obtain a colored coated glass substrate (i.e., resin material, wherein the thickness ratio of the first photonic crystal layer to the second photonic crystal layer is 1:1).

[0136] Example 3

[0137] The structural schematic diagram of the resin material in this Example 3 is as shown in Figure 2 and the preparation process of this resin material is as follows:

[0138] 1. Prepare the mixed solutions 1, 3, 4, and 5 respectively according to the above process;

[0139] 2. Pretreatment of the substrate (acrylic board)

[0140] Select a commercially available flat acrylic board (with a specification of 40 cm * 40 cm * 5 mm), and clean the acrylic board with water; after cleaning, dry it, and then perform corona treatment on the acrylic surface using industrial corona equipment. Measure that the contact angle of the acrylic board surface with respect to pure water is less than 30° through a contact angle meter. Place the pretreated acrylic board in a dust-free room for standby;

[0141] 3. Knife coating

[0142] In a dust-free room, control the temperature at 15°C to 25°C and the humidity at 10% to 40%. Perform the following steps S301 - S305 in this environment (in these steps, use a commercially available wire bar, the RDS series wire bar for knife coating);

[0143] S301. Roller coat the mixed solution 6

[0144] Use an RDS 22 wire bar to knife coat the mixed solution 6 on the surface of the clean acrylic board. The knife coating effect should be such that the mixed solution 6 evenly covers the acrylic board surface without flowing. Knife coat it all at once;

[0145] After knife coating, let it dry naturally in the dust-free room environment for 30 minutes to form the first photonic crystal layer;

[0146] S302. Knife coat the mixed solution 8

[0147] Use an RDS 22 wire bar to knife coat the mixed solution 8 on the surface of the acrylic board (the surface of the photonic crystal layer). The knife coating effect should be such that the mixed solution 8 evenly covers the dry film of the mixed solution 6 (i.e., the photonic crystal layer) on the acrylic board surface without flowing. Knife coat it all at once (after knife coating, it can be observed that the surface of the acrylic board is transparent and has physical colors that change with the viewing angle);

[0148] Let it dry naturally in the dust-free room environment for 30 minutes, then put it into a forced-air drying oven, dry it at 60°C for 10 minutes and at 90°C for 10 minutes in sequence, then take it out of the blower, and let it dry and cool naturally in the dust-free room to form the first resin layer;

[0149] S303. Knife coat the mixed solution 7

[0150] Use an RDS 44 wire bar to knife coat the mixed solution 7 on the surface of the acrylic board (the surface of the first resin layer). The knife coating effect should be such that the mixed solution 7 evenly covers the acrylic surface without flowing. Knife coat it all at once;

[0151] After scraping, it is naturally dried in a dust-free environment for 30 min to form a second photonic crystal layer;

[0152] S304. Scraping the mixture 8

[0153] Using a RDS No. 22 wire bar, scrape the mixture 8 on the surface of the acrylic plate (the surface of the photonic crystal layer). The scraping effect is preferably that the mixture 8 uniformly covers the dry film of the mixture 7 (i.e., the photonic crystal layer) on the surface of the acrylic plate without flowing. Scrape it once completely (after scraping, it can be observed that the surface of the acrylic is transparent and has physical colors, which change with the viewing angle);

[0154] Naturally dry in a dust-free environment for 30 min, then put it into a blast drying oven, dry it at 60 °C for 10 min and 90 °C for 10 min in sequence, take it out from the blast drying oven, and naturally dry and cool it in the dust-free room to form a first resin layer;

[0155] S305. Scraping the mixture 3

[0156] Using a RDS No. 22 wire bar, scrape the mixture 3 on the surface of the acrylic plate (the surface of the first resin layer). The scraping effect is preferably that the mixture 3 completely covers the first resin layer on the surface of the acrylic plate. Scrape it once completely (if it cannot be covered completely at one time, it can be scraped twice or more times);

[0157] After scraping, it is naturally dried in a dust-free environment for 30 min, then put it into a blast drying oven, dry it at 60 °C for 10 min and 90 °C for 30 min in sequence, take it out from the blast drying oven, and naturally dry and cool it in the dust-free room to obtain a colored coated acrylic substrate (i.e., a resin material, where the thickness ratio of the first photonic crystal layer to the second photonic crystal layer is 1:2).

[0158] According to the following process, the adhesion (testing the adhesion with reference to the standard of GB / T 13217.7-2023) and environmental reliability of the resin material products of each example are tested respectively. The test results are shown in Table 3:

[0159] (1) Adhesion test process: Use a cutting tool or a single-edge tool to draw small grids of 1 mm×1 mm or 2 mm×2 mm on the surface of the resin material product, and use a brush or a dust-free cloth to brush the debris in the test area clean; Press the tape flat above the grid area with your fingernail to ensure good contact between the tape and the resin material coating. The length of the tape is at least 20 mm longer than the grid. Stick the tape and let it stand for (90±30) s. Hold the suspended end of the tape and quickly pull the tape off the resin material at an angle as close to 60° as possible within 0.5 - 1.0 s. Test it once at the same position, check the film layer peeling condition, and judge the adhesion. The results are shown in Table 3 (adhesion);

[0160] (2) Environmental reliability test process (mainly including boiling water, high temperature and high humidity, and thermal shock tests, etc.):

[0161] Boiling water test: Immerse the test sample (resin material) completely in pure water at 80°C ± 2°C. After boiling for 30 minutes, take it out and let it stand at room temperature for 2 hours. Then check whether there are any abnormal phenomena such as blistering, wrinkling, and peeling on the surface of the sample coating, and conduct the adhesion test according to the above adhesion test process. The results are shown in Table 1 (adhesion after boiling water);

[0162] High temperature and high humidity test: Put the sample (resin material) into an incubator, adjust the incubator to a temperature of 55°C and a humidity of 95% RH, store it for 120 hours, then restore it to room temperature. Then check the appearance of the resin material (whether there are any abnormal phenomena such as blistering, wrinkling, and peeling), and conduct the adhesion test according to the above adhesion test process. The results are shown in Table 1 (adhesion under high temperature and high humidity);

[0163] Thermal shock test: Put the sample (resin material) into a thermal shock test chamber. First, keep it in a low-temperature environment of -40°C ± 2°C for 1 hour; then switch the temperature to a high-temperature environment of 70°C ± 2°C within 5 minutes and keep it in this high-temperature environment for 1 hour; the above is one cycle, and a total of 24 cycles are carried out; then take out the sample, check the appearance of the resin material coating (whether there are any abnormal phenomena such as blistering, wrinkling, and peeling), then let it stand at room temperature for 2 hours, and conduct the adhesion test according to the above adhesion test process. The results are shown in Table 1 (adhesion after thermal shock).

[0164] Table 3

[0165]

[0166] From the above test results, it can be seen that the resin material has good performance such as adhesion and environmental reliability. After the processes of boiling water, high temperature and high humidity, and thermal shock, there are no abnormal phenomena such as blistering, wrinkling, and peeling on the surface of the resin material, and it can still maintain good adhesion. It is not easy for the film layers of the resin material to peel off and other phenomena.

[0167] Finally, it should be noted that: The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: They can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A resin material, characterized in that, include: A body layer, the body layer comprising at least one structural color layer and a first resin layer located on at least one side of each structural color layer; The second resin layer is located on at least one side of the main body layer; the second resin layer comprises a second aqueous resin, a binder and an inorganic material additive.

2. The resin material according to claim 1, wherein The structural color layer includes a photonic crystal layer.

3. The resin material according to claim 2, wherein The photonic crystal layer includes photonic crystal microspheres, and the photonic crystal microspheres include organic material microspheres.

4. The resin material according to claim 3, wherein The organic material microspheres include one or more of polystyrene, polymethyl methacrylate, styrene-butyl acrylate-acrylic acid copolymer, polyacrylamide, poly(styrene-methacrylic acid), poly(styrene-acrylic acid), poly(styrene-hydroxyethyl acrylate), and poly(styrene-methyl methacrylate).

5. The resin material according to any one of claims 1-4, characterized in that, The structural color layer includes one or more of a surfactant, a first defoaming agent, a pH adjuster and a first ultraviolet absorber.

6. The resin material according to claim 5, characterized in that The surfactant includes an anionic surfactant; And / or, the pH adjuster includes an organic amine.

7. The resin material according to claim 6, characterized in that The anionic surfactant includes sodium dodecyl sulfate; And / or, the organic amine comprises triethanolamine.

8. The resin material according to claim 1, characterized in that, The first resin layer includes a first water-based resin, and the first water-based resin includes one or more of water-based phenolic resin, water-based epoxy resin, water-based acrylic resin, organic silicon resin, organic boron resin, and fluororesin.

9. The resin material according to claim 1 or 8, characterized in that, The first resin layer includes a second defoaming agent and / or a second ultraviolet absorber.

10. The resin material according to claim 1, characterized in that The second aqueous resin comprises an aqueous acrylic resin; And / or, the binder includes ethyl 2-hydroxymethylacrylate; And / or, the inorganic material auxiliary agent includes black iron oxide.

11. The resin material according to claim 1, characterized in that, The first resin layer penetrates into at least a portion of the structural color layer.

12. The resin material according to claim 1, wherein The first resin layer exists between the second resin layer and the structural color layer.

13. The resin material according to claim 1, characterized in that, The main body layer includes at least two stacked structural color layers, and the first resin layer exists between every two adjacent structural color layers.

14. The resin material according to claim 1, wherein It also includes a substrate, wherein the substrate is located on one side surface of the body layer, and the second resin layer is located on the other side surface of the body layer.

15. The resin material according to claim 14, characterized in that, The substrate includes one or more of glass, acrylic, metal, ceramic, and epoxy composite material.

16. A method for preparing the resin material according to any one of claims 1-15, characterized in that, The following steps are involved: providing a substrate; Alternately coating the first mixed liquid for forming the structural color layer and the second mixed liquid for forming the first resin layer on the substrate to form the body layer; wherein after each coating is completed, drying is performed before the next coating; The third mixed liquid for forming the second resin layer is coated on the side of the main layer away from the substrate, and after drying, the resin material is obtained.

17. The preparation method according to claim 16, characterized in that: The first mixed solution comprises components in the following mass fractions: 10-30% of photonic crystal microspheres, 3-18% of a first humectant, 0.5-1.5% of a surfactant, 1-2% of a first defoamer, 0.05-0.15% of a pH regulator, 0.05-0.15% of a first ultraviolet absorber, and the balance of water; wherein, the first humectant comprises one or more of ethylene glycol, isopropanol and glycerol; and / or, the second mixed solution comprises components in the following mass fractions: 10-40% of a first aqueous resin, 0.5-10% of a second humectant, 1-2% of a second defoamer, 0.05-2% of a second ultraviolet absorber, and the balance of organic solvents; wherein, the second humectant comprises one or more of ethylene glycol, isopropanol and glycerol; and / or, the third mixed solution comprises components in the following mass fractions: 10-20% of a second aqueous resin, 1-5% of a binder, 5-15% of an inorganic material additive, and the balance of water.

18. A structural member, characterized in that, comprising the resin material according to any one of claims 1-15.

19. The structural member according to claim 18, wherein, The structural member comprises a mobile phone, a tablet computer, a wearable device, a smart home appliance device or a power device.

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