PC protective shell for protecting mobile phone screen and preparation method of PC protective shell

Abstract

The invention provides a PC protective shell for protecting a mobile phone screen and a preparation method of the PC protective shell. The PC protective shell for protecting the mobile phone screen comprises a shell body and a composite adhesive layer attached to the surface of the shell body, the shell comprises an optical PC film and a hardened coating located on the surface of the optical PC film. The composite adhesive layer comprises an optical transparent adhesive layer, an optical film layer, a soft adhesive layer and a release film which are stacked in sequence; and the optical transparent adhesive layer in the composite adhesive layer is attached to the surface of the optical PC film in the shell. The hard coating is particularly introduced, the design greatly improves the smoothness during use, fingerprints and oil stains are difficult to attach due to the characteristic of a high water contact angle, so that the cleanness and transparency of a screen are kept, meanwhile, the hard coating also endows the protective shell with excellent scratch resistance and wear resistance, and the protective shell is not easy to fall off even in a long-time use process. And new appearance and touch feeling can be kept.

Description

Technical Field

[0001] The invention belongs to the technical field of screen protection, and relates to a PC protective shell for protecting a mobile phone screen and a preparation method thereof. Background Art

[0002] With the development of electronic technology, large curved surfaces and full screens have become a trend in current mobile phone screens.

[0003] The emergence of large curved and full-screen phones has made phone screen protectors even more troublesome. Conventional protective films still have the phenomenon of rebounding even after hot pressing. Applying a protective film can effectively protect the screen of your phone from being bumped in daily life. Without a protective film, the screen of your phone will be unsightly after using it for a period of time. Therefore, applying a protective film or wearing a protective case is still the first choice for mobile phone users.

[0004] With the design of large curved surface and full screen, the unlocking method of mobile phone has also changed from password unlocking to fingerprint unlocking, and then to face unlocking. In just a few years, the unlocking method of mobile phone has undergone several rounds of changes. Under-screen fingerprint recognition has become one of the main unlocking methods of flagship mobile phones. Under-screen fingerprint recognition is indeed cooler and is increasingly respected by mobile phone design and production manufacturers. Under-screen optical screen fingerprint recognition is the most commonly used under-screen fingerprint unlocking method for flagship phones in recent years. Due to the phase difference of conventional protective films, the unlocking is not sensitive after applying ordinary protective films, and the success rate is low.

[0005] The protective shell of the present invention can better fit large curved screens and full screens, and can solve the problems of light-sensitive fingerprint recognition sensitivity and success rate. Summary of the invention

[0006] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a PC protective case for protecting a mobile phone screen and a preparation method thereof. The PC protective case provided by the present invention particularly introduces a hardened coating, which greatly improves the smoothness during use. The high water contact angle makes it difficult for fingerprints and oil stains to adhere, thereby keeping the screen clean and transparent. At the same time, the hardened coating also gives the protective case excellent scratch resistance and wear resistance, and even during long-term use, it can maintain a new appearance and touch.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] In a first aspect, the present invention provides a PC protective shell for protecting a mobile phone screen, the PC protective shell for protecting a mobile phone screen comprising a shell and a composite adhesive layer attached to a surface of the shell;

[0009] The housing comprises an optical PC film and a hardened coating on the surface of the optical PC film; the composite adhesive layer comprises an optically transparent adhesive layer, an optical film layer, a soft adhesive layer and a release film stacked in sequence; the optically transparent adhesive layer in the composite adhesive layer is attached to the surface of the optical PC film in the housing;

[0010] When in use, the release film is torn off, and the soft adhesive layer of the PC protective shell for protecting the mobile phone screen is attached to the surface of the mobile phone screen.

[0011] The PC protective case provided by the present invention particularly introduces a hardened coating, which greatly improves the smoothness during use. The high water contact angle makes it difficult for fingerprints and oil stains to adhere, thereby keeping the screen clean and transparent. At the same time, the hardened coating also gives the protective case excellent scratch resistance and wear resistance, and even during long-term use, it can maintain a new appearance and touch.

[0012] With the diversification of smartphone screens, especially the popularity of curved screens and full screens, higher requirements are placed on the adaptability of screen protective cases. The optical PC film used in the present invention has excellent curved surface forming and processing performance, and can be tightly fitted to curved screens of different curvatures through a hot pressing process. This feature enables the PC protective case provided by the present invention to perfectly adapt to the vast majority of mobile phone screens on the market. Whether it is a traditional flat screen or an emerging curved screen, a protective case that matches it can be found.

[0013] In the process of fitting the mobile phone screen, traditional screen protectors are often prone to problems such as bubbles and residual glue, which affect the appearance and use effect. The present invention effectively solves this problem through the design of a thickened soft glue layer. The thickened soft glue layer not only has better elasticity and can fit tightly to the large-arc curved screen, making up for the deficiencies that may be caused by hot pressing molding, but also ensures that there is no residual glue and no bubbles during the fitting process, so that the protective case and the mobile phone screen form a perfect fitting effect. In addition, the re-stickability of the soft glue layer also greatly increases the practicality and durability of the protective case.

[0014] For mobile phones with under-screen light-sensing fingerprint unlocking function, the light transmittance and phase difference of the protective shell are key factors affecting the sensitivity and success rate of fingerprint recognition. The optical film layer and optical PC film used in the present invention have the characteristics of zero phase difference, ensuring that the light can maintain its original optical properties when penetrating the screen protective shell. This design not only improves the sensitivity of light-sensing fingerprint recognition, but also reduces the false recognition rate, allowing users to enjoy a smoother and more convenient experience when unlocking their mobile phones.

[0015] The PC protective case for mobile phone screen protection proposed by the present invention performs well in many aspects. It not only improves the user experience and feel, but also meets the needs of different mobile phone screen forms by optimizing the fitting effect and enhancing adaptability. At the same time, the zero phase difference design also greatly improves the sensitivity and success rate of light-sensitive fingerprint recognition. In addition, the PC protective case provided by the present invention also has multiple advantages such as easy cleaning, scratch resistance, and wear resistance, which truly realizes comprehensive protection of the mobile phone screen.

[0016] In summary, the PC protective case for mobile phone screen protection and the preparation method thereof proposed in the present invention have significant beneficial effects, which not only improve the user experience and satisfaction, but also make positive contributions to the development and progress of the industry.

[0017] As a preferred technical solution of the present invention, the thickness of the optical PC film is 100-200 μm, for example, it can be 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm or 200 μm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0018] In some optional examples, a hardening coating is sprayed on one surface of the optical PC film, and the hardened coating is obtained after photocuring.

[0019] In some optional examples, the thickness of the hardened coating is 3 to 5 μm, for example, it can be 3.0 μm, 3.2 μm, 3.4 μm, 3.6 μm, 3.8 μm, 4.0 μm, 4.2 μm, 4.4 μm, 4.6 μm, 4.8 μm or 5.0 μm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0020] As a preferred technical solution of the present invention, the optically transparent adhesive layer is an acrylic pressure-sensitive adhesive.

[0021] In some optional examples, the thickness of the optically transparent adhesive layer is 50 to 60 μm, for example, it can be 50 μm, 51 μm, 52 μm, 53 μm, 54 μm, 55 μm, 56 μm, 57 μm, 58 μm, 59 μm or 60 μm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0022] In some optional examples, the optical film layer is any one of a PET film, a CPP film, a TAC film or a SRF film.

[0023] In some optional examples, the thickness of the optical film layer is 50 to 80 μm, for example, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm or 80 μm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0024] In some optional examples, the soft adhesive layer is a silicone pressure-sensitive adhesive.

[0025] In some optional examples, the thickness of the soft rubber layer is 0.5 to 1.5 mm, for example, it can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm or 1.5 mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0026] In some optional examples, the release film includes a PET base film and a release coating coated on the surface of the base film, and the release coating is bonded to the soft adhesive layer.

[0027] In some optional examples, the thickness of the PET base film is 30 to 50 μm, for example, it can be 30 μm, 32 μm, 34 μm, 36 μm, 38 μm, 40 μm, 42 μm, 44 μm, 46 μm, 48 μm or 50 μm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0028] In some optional examples, the thickness of the release coating is 0.2-0.5 μm, for example, 0.2 μm, 0.25 μm, 0.3 μm, 0.35 μm, 0.4 μm, 0.45 μm or 0.5 μm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0029] In a second aspect, the present invention provides a method for preparing the PC protective shell for protecting the mobile phone screen according to the first aspect, the preparation method comprising:

[0030] (1) uniformly coating a release agent on a surface of a PET base film, and drying the PET base film to form a release coating on the surface of the PET base film, thereby obtaining a release film consisting of the PET base film and the release coating;

[0031] (2) coating a silicone pressure-sensitive adhesive on one side of the optical film layer, and forming a soft adhesive layer on the one side of the optical film layer after high-temperature curing, and laminating the release film obtained in step (1) to the soft adhesive layer, and laminating the release coating in the release film to the surface of the soft adhesive layer;

[0032] (3) coating an acrylic pressure-sensitive adhesive on the other side of the optical film layer, and forming an optically transparent adhesive layer on the other side of the optical film layer after high-temperature curing, thereby obtaining a composite adhesive layer consisting of the optically transparent adhesive layer, the optical film layer, the soft adhesive layer and the release film;

[0033] (4) using polycarbonate powder as a raw material, preparing an optical PC film by a mold hot pressing molding process according to the size of the mobile phone screen, coating a hardening coating on one side of the optical PC film, and performing photocuring after drying to form a hardened coating on one side of the optical PC film, thereby obtaining a housing consisting of the optical PC film and the hardened coating;

[0034] (5) bonding the composite adhesive layer obtained in step (3) to the shell obtained in step (4); during bonding, bonding the optically transparent adhesive layer in the composite adhesive layer to the surface of the optical PC film in the shell obtained in step (4), thereby obtaining the PC protective case for mobile phone screen protection consisting of the composite adhesive layer and the shell.

[0035] As a preferred technical solution of the present invention, in step (2), the high-temperature curing temperature of the silicone pressure-sensitive adhesive is 150-160°C, for example, it can be 150°C, 151°C, 152°C, 153°C, 154°C, 155°C, 156°C, 157°C, 158°C, 159°C or 160°C, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0036] In some optional examples, the high-temperature curing time of the silicone pressure-sensitive adhesive is 120 to 180 seconds, for example, it can be 120 seconds, 125 seconds, 130 seconds, 135 seconds, 140 seconds, 145 seconds, 150 seconds, 155 seconds, 160 seconds, 165 seconds, 170 seconds, 175 seconds or 180 seconds, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0037] As a preferred technical solution of the present invention, in step (3), the high-temperature curing temperature of the acrylic pressure-sensitive adhesive is 100-120°C, for example, it can be 100°C, 102°C, 104°C, 106°C, 108°C, 110°C, 112°C, 114°C, 116°C, 118°C or 120°C, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0038] In some optional examples, the high temperature curing time of the acrylic pressure-sensitive adhesive is 90 to 120 seconds, for example, 90 seconds, 95 seconds, 100 seconds, 105 seconds, 110 seconds, 115 seconds or 120 seconds, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0039] As a preferred technical solution of the present invention, in step (4), the drying temperature of the hardened coating is 80-90°C, for example, it can be 80°C, 81°C, 82°C, 83°C, 84°C, 85°C, 86°C, 87°C, 88°C, 89°C or 90°C, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0040] In some optional examples, the drying time of the hardened coating is 90 to 120 seconds, for example, 90 seconds, 95 seconds, 100 seconds, 105 seconds, 110 seconds, 115 seconds or 120 seconds, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0041] In some optional embodiments, the UV light intensity used for the photocuring of the hardened coating is 300-500 MJ / cm 2 , for example, it can be 300MJ / cm 2 、320MJ / cm 2 、340MJ / cm 2 、360MJ / cm 2 、380MJ / cm 2 、400MJ / cm 2 、420MJ / cm 2 、440MJ / cm 2 、460MJ / cm 2 、480MJ / cm 2 or 500MJ / cm 2 , but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0042] In some optional examples, the light curing time of the hardened coating is 60 to 80 seconds, for example, it can be 60s, 62s, 64s, 66s, 68s, 70s, 72s, 74s, 76s, 78s or 80s, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0043] As a preferred technical solution of the present invention, in step (4), the hardened coating is composed of the following components in parts by weight:

[0044]

[0045] Wherein, the weight part of epoxy acrylate resin can be 50 parts, 51 parts, 52 parts, 53 parts, 54 parts, 55 parts, 56 parts, 57 parts, 58 parts, 59 parts or 60 parts, the weight part of polyurethane acrylate resin can be 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts or 30 parts, the weight part of methyl methacrylate resin can be 5.0 parts, 5.5 parts, 6.0 parts, 6.5 parts, 7.0 parts, 7.5 parts, 8.0 parts, 8.5 parts, 9.0 parts, 9.5 parts or 10.0 parts, the weight part of hydroxyethyl acrylate can be 5.0 parts, 5.5 parts, 6.0 parts, 6.5 parts, 7.0 parts, 7.5 parts, 8.0 parts, 8.5 parts, 9.0 parts, 9.5 parts or 10.0 parts, and the weight part of coupling agent can be 5 The weight parts of the leveling agent can be 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, 1.0 parts, 1.1 parts, 1.2 parts, 1.3 parts, 1.4 parts or 1.5 parts, and the weight parts of the photoinitiator can be 2.0 parts, 2 .1 parts, 2.2 parts, 2.3 parts, 2.4 parts, 2.5 parts, 2.6 parts, 2.7 parts, 2.8 parts, 2.9 parts or 3.0 parts by weight, the weight parts of organic solvent can be 80 parts, 82 parts, 84 parts, 86 parts, 88 parts, 90 parts, 92 parts, 94 parts, 96 parts, 98 parts or 100 parts, but are not limited to the listed values, and other unlisted values ​​within the numerical range are equally applicable.

[0046] In some optional examples, the coupling agent includes KH550, KH560 or KH570.

[0047] In some optional examples, the photoinitiator includes any one of 2-hydroxy-2-methyl-1-phenyl-1-propanone, 1-hydroxycyclohexyl phenyl ketone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, benzoin dimethyl ether or isooctyl p-dimethylaminobenzoate, or a combination of at least two thereof.

[0048] In some optional examples, the organic solvent includes any one of acetone, tetrahydrofuran, ethyl acetate, butyl acetate or isopropyl acetate, or a combination of at least two thereof.

[0049] Compared with the prior art, the present invention has the following beneficial effects:

[0050] The PC protective case provided by the present invention particularly introduces a hardened coating, which greatly improves the smoothness during use. The high water contact angle makes it difficult for fingerprints and oil stains to adhere, thereby keeping the screen clean and transparent. At the same time, the hardened coating also gives the protective case excellent scratch resistance and wear resistance, and even during long-term use, it can maintain a new appearance and touch.

[0051] With the diversification of smartphone screens, especially the popularity of curved screens and full screens, higher requirements are placed on the adaptability of screen protective cases. The optical PC film used in the present invention has excellent curved surface forming and processing performance, and can be tightly fitted to curved screens of different curvatures through a hot pressing process. This feature enables the PC protective case provided by the present invention to perfectly adapt to the vast majority of mobile phone screens on the market. Whether it is a traditional flat screen or an emerging curved screen, a protective case that matches it can be found.

[0052] In the process of fitting the mobile phone screen, traditional screen protectors are often prone to problems such as bubbles and residual glue, which affect the appearance and use effect. The present invention effectively solves this problem through the design of a thickened soft glue layer. The thickened soft glue layer not only has better elasticity and can fit tightly to the large-arc curved screen, making up for the deficiencies that may be caused by hot pressing molding, but also ensures that there is no residual glue and no bubbles during the fitting process, so that the protective case and the mobile phone screen form a perfect fitting effect. In addition, the re-stickability of the soft glue layer also greatly increases the practicality and durability of the protective case.

[0053] For mobile phones with under-screen light-sensing fingerprint unlocking function, the light transmittance and phase difference of the protective shell are key factors affecting the sensitivity and success rate of fingerprint recognition. The optical film layer and optical PC film used in the present invention have the characteristics of zero phase difference, ensuring that the light can maintain its original optical properties when penetrating the screen protective shell. This design not only improves the sensitivity of light-sensing fingerprint recognition, but also reduces the false recognition rate, allowing users to enjoy a smoother and more convenient experience when unlocking their mobile phones.

[0054] The PC protective case for mobile phone screen protection proposed by the present invention performs well in many aspects. It not only improves the user experience and feel, but also meets the needs of different mobile phone screen forms by optimizing the fitting effect and enhancing adaptability. At the same time, the zero phase difference design also greatly improves the sensitivity and success rate of light-sensitive fingerprint recognition. In addition, the PC protective case provided by the present invention also has multiple advantages such as easy cleaning, scratch resistance, and wear resistance, which truly realizes comprehensive protection of the mobile phone screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 This is a schematic diagram of the structure of the PC protective shell for mobile phone screen protection prepared in Examples 1-5 of the present invention;

[0056] Among them, 1-hardening coating; 2-optical PC film; 3-optical transparent adhesive layer; 4-optical film layer; 5-soft adhesive layer; 6-release coating; 7-PET base film; 8-release film; 9-composite adhesive layer; 10-shell. DETAILED DESCRIPTION

[0057] The technical solution of the present invention is described in detail below in conjunction with specific embodiments and their accompanying drawings. The embodiments recorded herein are specific embodiments of the present invention, which are used to illustrate the concept of the present invention; these descriptions are explanatory and exemplary and should not be construed as limitations on the embodiments of the present invention and the scope of protection of the present invention. In addition to the embodiments recorded herein, those skilled in the art can also adopt other obvious technical solutions based on the contents disclosed in the claims of this application and its specification, including technical solutions that adopt any obvious replacements and modifications to the embodiments recorded herein.

[0058] Release agent: non-silicone release agent, purity 99%, industrial grade, purchased from Tianmen Hengchang Chemical Co., Ltd.

[0059] Silicone pressure-sensitive adhesive: Sinopec Baling SIS1105.

[0060] Acrylic pressure-sensitive adhesive: German Henkel DURO-TAK 3768 acrylic pressure-sensitive adhesive.

[0061] Epoxy acrylate resin: purity 99%, industrial grade, purchased from Shandong Dongde New Materials Co., Ltd.

[0062] Polyurethane acrylate resin: purity 99%, industrial grade, purchased from Hunan Jinhai Technology Co., Ltd.

[0063] Methyl methacrylate resin: purity 99%, industrial grade, Shandong Zhengxing New Materials Co., Ltd.

[0064] Hydroxyethyl acrylate: purity 99%, product number KA731522, purchased from Shandong Yonglida New Materials Technology Co., Ltd.

[0065] Silane coupling agent KH550: Product No. S15028-500ml, purchased from Shanghai Yuanye Biotechnology Co., Ltd.

[0066] Silane coupling agent KH560: Product No. S15029-500ml, purchased from Shanghai Yuanye Biotechnology Co., Ltd.

[0067] Silane coupling agent KH570: Product No. S15030-500ml, purchased from Shanghai Yuanye Biotechnology Co., Ltd.

[0068] 2-Hydroxy-2-methyl-1-phenyl-1-propanone: Product No. S50293-100g, purchased from Shanghai Yuanye Biotechnology Co., Ltd.

[0069] 1-Hydroxycyclohexylphenyl ketone: Product No. S52049-100g, purchased from Shanghai Yuanye Biotechnology Co., Ltd.

[0070] 2,4,6-Trimethylbenzoyl-diphenylphosphine oxide: Product No. S31034-5g, purchased from Shanghai Yuanye Biotechnology Co., Ltd.

[0071] Benzoin dimethyl ether: Product No. S45044-25g, purchased from Shanghai Yuanye Biotechnology Co., Ltd.

[0072] 2-Ethylhexyl p-dimethylaminobenzoate: Product No. B65625-100mg, purchased from Shanghai Yuanye Biotechnology Co., Ltd.

[0073] Tetrahydrofuran: purity 99.9%, purchased from Shandong Yanshuo Chemical Co., Ltd.

[0074] Acetone: purity 99.9%, purchased from Shandong Langcheng Chemical Co., Ltd.

[0075] Ethyl acetate: purity 99.9%, purchased from Shandong Langcheng Chemical Co., Ltd.

[0076] Butyl acetate: purity 99.9%, purchased from Jinan Chuangshi Chemical Co., Ltd.

[0077] Isopropyl acetate: purity 99.9%, purchased from Jinan Jinhong Chemical Co., Ltd.

[0078] Example 1

[0079] This embodiment provides a method for preparing a PC protective shell for protecting a mobile phone screen, the preparation method comprising:

[0080] (1) uniformly coating a release agent on a surface of a PET base film 7, and drying the surface to form a release coating 6 on the surface of the PET base film 7, thereby obtaining a release film 8 consisting of the PET base film 7 and the release coating 6; wherein the thickness of the PET base film 7 is 50 μm, and the thickness of the release coating 6 is 0.2 μm;

[0081] (2) coating a silicone pressure-sensitive adhesive on one side of the optical film layer 4, and curing the adhesive at 150° C. for 180 seconds to form a soft adhesive layer 5 on one side of the optical film layer 4, and laminating the release film 8 obtained in step (1) to the soft adhesive layer 5. During the lamination, the release coating 6 in the release film 8 is laminated to the surface of the soft adhesive layer 5; wherein the thickness of the optical film layer 4 is 50 μm, and the thickness of the soft adhesive layer 5 is 0.5 mm;

[0082] (3) coating an acrylic pressure-sensitive adhesive on the other side of the optical film layer 4, and curing the adhesive at 100° C. for 120 seconds to form an optically transparent adhesive layer 3 on the other side of the optical film layer 4, thereby obtaining a composite adhesive layer 9 consisting of the optically transparent adhesive layer 3, the optical film layer 4, the soft adhesive layer 5, and the release film 8; wherein the thickness of the optically transparent adhesive layer 3 is 50 μm;

[0083] The hardening coating was applied to one side of the optical PC film 2, dried at 80°C for 120 seconds, and then passed through a 300 MJ / cm 2 The optical PC film 2 is irradiated with ultraviolet light for 80 seconds for light curing to form a hardened coating layer 1 with a thickness of 3 μm on one side surface of the optical PC film 2, thereby obtaining a housing 10 consisting of the optical PC film 2 and the hardened coating layer 1;

[0084] The hardening coating is composed of the following components in parts by weight:

[0085]

[0086] (5) The composite adhesive layer 9 obtained in step (3) is bonded to the shell 10 obtained in step (4). During bonding, the optically transparent adhesive layer 3 in the composite adhesive layer 9 is bonded to the surface of the optical PC film 2 in the shell 10 obtained in step (4), thereby obtaining the PC protective case for mobile phone screen protection composed of the composite adhesive layer 9 and the shell 10.

[0087] This embodiment also provides a PC protective shell for protecting a mobile phone screen. Figure 1 As shown, the PC protective shell for protecting the mobile phone screen includes a shell 10 and a composite adhesive layer 9 attached to the surface of the shell 10.

[0088] The housing 10 includes an optical PC film 2 and a hardening coating 1 located on the surface of the optical PC film 2 . The thickness of the optical PC film 2 is 100 μm, and the thickness of the hardening coating 1 is 3 μm.

[0089] The composite adhesive layer 9 includes an optically transparent adhesive layer 3, an optical film layer 4, a soft adhesive layer 5 and a release film 8 which are stacked in sequence; the optically transparent adhesive layer 3 in the composite adhesive layer 9 is attached to the surface of the optical PC film 2 in the housing 10. The optically transparent adhesive layer 3 has a thickness of 50 μm; the optical film layer 4 is a PET film, and the thickness of the optical film layer 4 is 50 μm; the soft adhesive layer 5 is a silicone pressure-sensitive adhesive, and the thickness of the soft adhesive layer 5 is 0.5 mm; the release film 8 includes a PET base film 7 and a release coating 6 coated on the surface of the base film, the release coating 6 is attached to the soft adhesive layer 5, the thickness of the PET base film 7 is 50 μm, and the thickness of the release coating 6 is 0.2 μm.

[0090] When in use, the PET release film 8 is torn off, and the soft adhesive layer 5 of the PC protective shell for protecting the mobile phone screen is attached to the surface of the mobile phone screen.

[0091] Example 2

[0092] This embodiment provides a method for preparing a PC protective shell for protecting a mobile phone screen, the preparation method comprising:

[0093] (1) uniformly coating a release agent on the surface of a PET base film 7, and drying the release coating 6 to form a release film 8 consisting of the PET base film 7 and the release coating 6; wherein the thickness of the PET base film 7 is 30 μm, and the thickness of the release coating 6 is 0.3 μm;

[0094] (2) coating a silicone pressure-sensitive adhesive on one side of the optical film layer 4, and curing the adhesive at 152° C. for 160 seconds to form a soft adhesive layer 5 on one side of the optical film layer 4, and laminating the release film 8 obtained in step (1) to the soft adhesive layer 5. During the lamination, the release coating 6 in the release film 8 is laminar to the surface of the soft adhesive layer 5; wherein the thickness of the optical film layer 4 is 50 μm, and the thickness of the soft adhesive layer 5 is 0.8 mm;

[0095] (3) coating an acrylic pressure-sensitive adhesive on the other side of the optical film layer 4, and curing the adhesive at 105° C. for 110 seconds to form an optically transparent adhesive layer 3 on the other side of the optical film layer 4, thereby obtaining a composite adhesive layer 9 consisting of the optically transparent adhesive layer 3, the optical film layer 4, the soft adhesive layer 5, and the release film 8; wherein the thickness of the optically transparent adhesive layer 3 is 50 μ0;

[0096] The hardening coating was applied to one side of the optical PC film 2, dried at 82°C for 110 seconds, and then passed through a 350 MJ / cm 2 The optical PC film 2 is irradiated with ultraviolet light for 75 seconds for light curing to form a hardened coating layer 1 with a thickness of 3 μm on one side surface of the optical PC film 2, thereby obtaining a housing 10 consisting of the optical PC film 2 and the hardened coating layer 1;

[0097] The hardening coating is composed of the following components in parts by weight:

[0098]

[0099] (5) The composite adhesive layer 9 obtained in step (3) is bonded to the shell 10 obtained in step (4). During bonding, the optically transparent adhesive layer 3 in the composite adhesive layer 9 is bonded to the surface of the optical PC film 2 in the shell 10 obtained in step (4), thereby obtaining the PC protective case for mobile phone screen protection composed of the composite adhesive layer 9 and the shell 10.

[0100] This embodiment also provides a PC protective shell for protecting a mobile phone screen. Figure 1 As shown, the PC protective shell for protecting the mobile phone screen includes a shell 10 and a composite adhesive layer 9 attached to the surface of the shell 10.

[0101] The housing 10 includes an optical PC film 2 and a hardening coating 1 located on the surface of the optical PC film 2 . The thickness of the optical PC film 2 is 150 μm, and the thickness of the hardening coating 1 is 3 μm.

[0102] The composite adhesive layer 9 includes an optically transparent adhesive layer 3, an optical film layer 4, a soft adhesive layer 5 and a release film 8 which are stacked in sequence; the optically transparent adhesive layer 3 in the composite adhesive layer 9 is attached to the surface of the optical PC film 2 in the housing 10. The optically transparent adhesive layer 3 has a thickness of 50μ0; the optical film layer 4 is a PET film, and the thickness of the optical film layer 4 is 50μm; the soft adhesive layer 5 is a silicone pressure-sensitive adhesive, and the thickness of the soft adhesive layer 5 is 0.8mm; the release film 8 includes a PET base film 7 and a release coating 6 coated on the surface of the base film, the release coating 6 is attached to the soft adhesive layer 5, the thickness of the PET base film 7 is 30μm, and the thickness of the release coating 6 is 0.3μm.

[0103] When in use, the PET release film 8 is torn off, and the soft adhesive layer 5 of the PC protective shell for protecting the mobile phone screen is attached to the surface of the mobile phone screen.

[0104] Example 3

[0105] This embodiment provides a method for preparing a PC protective shell for protecting a mobile phone screen, the preparation method comprising:

[0106] (1) uniformly coating a release agent on a surface of a PET base film 7, and drying the release coating 6 to form a release film 8 consisting of the PET base film 7 and the release coating 6; wherein the thickness of the PET base film 7 is 38 μm, and the thickness of the release coating 6 is 0.4 μm;

[0107] (2) coating a silicone pressure-sensitive adhesive on one side of the optical film layer 4, and curing the adhesive at 155° C. for 150 seconds to form a soft adhesive layer 5 on one side of the optical film layer 4, and laminating the release film 8 obtained in step (1) to the soft adhesive layer 5. During the lamination, the release coating 6 in the release film 8 is laminar to the surface of the soft adhesive layer 5; wherein the thickness of the optical film layer 4 is 50 μm, and the thickness of the soft adhesive layer 5 is 1 mm;

[0108] (3) coating an acrylic pressure-sensitive adhesive on the other side surface of the optical film layer 4, and curing the adhesive at 110° C. for 110 seconds to form an optically transparent adhesive layer 3 on the other side surface of the optical film layer 4, thereby obtaining a composite adhesive layer 9 consisting of the optically transparent adhesive layer 3, the optical film layer 4, the soft adhesive layer 5 and the release film 8; wherein the thickness of the optically transparent adhesive layer 3 is 60 μm;

[0109] The hardening coating was applied to one side of the optical PC film 2, dried at 85°C for 110 seconds, and then passed through a 400 MJ / cm 2The optical PC film 2 is irradiated with ultraviolet light for 70 seconds for light curing to form a hardened coating layer 1 with a thickness of 4 μm on one side surface of the optical PC film 2, thereby obtaining a housing 10 consisting of the optical PC film 2 and the hardened coating layer 1;

[0110] The hardening coating is composed of the following components in parts by weight:

[0111]

[0112]

[0113] (5) The composite adhesive layer 9 obtained in step (3) is bonded to the shell 10 obtained in step (4). During bonding, the optically transparent adhesive layer 3 in the composite adhesive layer 9 is bonded to the surface of the optical PC film 2 in the shell 10 obtained in step (4), thereby obtaining the PC protective case for mobile phone screen protection composed of the composite adhesive layer 9 and the shell 10.

[0114] This embodiment also provides a PC protective shell for protecting a mobile phone screen. Figure 1 As shown, the PC protective shell for protecting the mobile phone screen includes a shell 10 and a composite adhesive layer 9 attached to the surface of the shell 10.

[0115] The housing 10 includes an optical PC film 2 and a hardening coating 1 located on the surface of the optical PC film 2 . The thickness of the optical PC film 2 is 150 μm, and the thickness of the hardening coating 1 is 4 μm.

[0116] The composite adhesive layer 9 includes an optically transparent adhesive layer 3, an optical film layer 4, a soft adhesive layer 5 and a release film 8 which are stacked in sequence; the optically transparent adhesive layer 3 in the composite adhesive layer 9 is attached to the surface of the optical PC film 2 in the housing 10. The optically transparent adhesive layer 3 has a thickness of 60 μm; the optical film layer 4 is a PET film, and the thickness of the optical film layer 4 is 50 μm; the soft adhesive layer 5 is a silicone pressure-sensitive adhesive, and the thickness of the soft adhesive layer 5 is 1 mm; the release film 8 includes a PET base film 7 and a release coating 6 coated on the surface of the base film, the release coating 6 is attached to the soft adhesive layer 5, the thickness of the PET base film 7 is 38 μm, and the thickness of the release coating 6 is 0.4 μm.

[0117] When in use, the PET release film 8 is torn off, and the soft adhesive layer 5 of the PC protective shell for protecting the mobile phone screen is attached to the surface of the mobile phone screen.

[0118] Example 4

[0119] This embodiment provides a method for preparing a PC protective shell for protecting a mobile phone screen, the preparation method comprising:

[0120] (1) uniformly coating a release agent on a surface of a PET base film 7, and drying the surface of the PET base film 7 to form a release coating 6, thereby obtaining a release film 8 consisting of the PET base film 7 and the release coating 6; wherein the thickness of the PET base film 7 is 45 μm, and the thickness of the release coating 6 is 0.5 μm;

[0121] (2) coating a silicone pressure-sensitive adhesive on one side of the optical film layer 4, and curing the adhesive at 158° C. for 130 seconds to form a soft adhesive layer 5 on one side of the optical film layer 4, and laminating the release film 8 obtained in step (1) to the soft adhesive layer 5. During the lamination, the release coating 6 in the release film 8 is laminated to the surface of the soft adhesive layer 5; wherein the thickness of the optical film layer 4 is 60 μm, and the thickness of the soft adhesive layer 5 is 1.2 mm;

[0122] (3) coating an acrylic pressure-sensitive adhesive on the other side surface of the optical film layer 4, and curing the adhesive at 115° C. for 100 seconds to form an optically transparent adhesive layer 3 on the other side surface of the optical film layer 4, thereby obtaining a composite adhesive layer 9 consisting of the optically transparent adhesive layer 3, the optical film layer 4, the soft adhesive layer 5 and the release film 8; wherein the thickness of the optically transparent adhesive layer 3 is 60 μm;

[0123] The hardening coating was applied to one side of the optical PC film 2, dried at 88°C for 100s, and then passed through a 450MJ / cm 2 The optical PC film 2 is irradiated with ultraviolet light for 65 seconds for light curing to form a hardened coating layer 1 with a thickness of 4 μm on one side surface of the optical PC film 2, thereby obtaining a housing 10 consisting of the optical PC film 2 and the hardened coating layer 1;

[0124] The hardening coating is composed of the following components in parts by weight:

[0125]

[0126] (5) The composite adhesive layer 9 obtained in step (3) is bonded to the shell 10 obtained in step (4). During bonding, the optically transparent adhesive layer 3 in the composite adhesive layer 9 is bonded to the surface of the optical PC film 2 in the shell 10 obtained in step (4), thereby obtaining the PC protective case for mobile phone screen protection composed of the composite adhesive layer 9 and the shell 10.

[0127] This embodiment also provides a PC protective shell for protecting a mobile phone screen. Figure 1 As shown, the PC protective shell for protecting the mobile phone screen includes a shell 10 and a composite adhesive layer 9 attached to the surface of the shell 10.

[0128] The housing 10 includes an optical PC film 2 and a hardening coating 1 located on the surface of the optical PC film 2 . The thickness of the optical PC film 2 is 175 μm, and the thickness of the hardening coating 1 is 4 μm.

[0129] The composite adhesive layer 9 includes an optically transparent adhesive layer 3, an optical film layer 4, a soft adhesive layer 5 and a release film 8 which are stacked in sequence; the optically transparent adhesive layer 3 in the composite adhesive layer 9 is attached to the surface of the optical PC film 2 in the housing 10. The optically transparent adhesive layer 3 has a thickness of 60 μm; the optical film layer 4 is a TAC film, and the thickness of the optical film layer 4 is 60 μm; the soft adhesive layer 5 is a silicone pressure-sensitive adhesive, and the thickness of the soft adhesive layer 5 is 1.2 mm; the release film 8 includes a PET base film 7 and a release coating 6 coated on the surface of the base film, the release coating 6 is attached to the soft adhesive layer 5, the thickness of the PET base film 7 is 45 degrees, and the thickness of the release coating 6 is 0.5 μm.

[0130] When in use, the PET release film 8 is torn off, and the soft adhesive layer 5 of the PC protective shell for protecting the mobile phone screen is attached to the surface of the mobile phone screen.

[0131] Example 5

[0132] This embodiment provides a method for preparing a PC protective shell for protecting a mobile phone screen, the preparation method comprising:

[0133] (1) uniformly coating a release agent on a surface of a PET base film 7, and drying the surface of the PET base film 7 to form a release coating 6, thereby obtaining a release film 8 consisting of the PET base film 7 and the release coating 6; wherein the thickness of the PET base film 7 is 50 μm, and the thickness of the release coating 6 is 0.5 μm;

[0134] (2) coating a silicone pressure-sensitive adhesive on one side of the optical film layer 4, and curing the adhesive at 160° C. for 120 seconds to form a soft adhesive layer 5 on one side of the optical film layer 4, and laminating the release film 8 obtained in step (1) to the soft adhesive layer 5. During the lamination, the release coating 6 in the release film 8 is laminated to the surface of the soft adhesive layer 5; wherein the thickness of the optical film layer 4 is 80 μm, and the thickness of the soft adhesive layer 5 is 1.5 mm;

[0135] (3) coating an acrylic pressure-sensitive adhesive on the other side of the optical film layer 4, and curing the adhesive at 120° C. for 90 seconds to form an optically transparent adhesive layer 3 on the other side of the optical film layer 4, thereby obtaining a composite adhesive layer 9 consisting of the optically transparent adhesive layer 3, the optical film layer 4, the soft adhesive layer 5, and the release film 8; wherein the thickness of the optically transparent adhesive layer 3 is 60 μm;

[0136] The hardening coating was applied to one side of the optical PC film 2, dried at 90°C for 90 seconds, and then passed through a 500 MJ / cm 2 The optical PC film 2 is irradiated with ultraviolet light for 60 seconds for light curing to form a hardened coating layer 1 with a thickness of 5 μm on one side surface of the optical PC film 2, thereby obtaining a housing 10 consisting of the optical PC film 2 and the hardened coating layer 1;

[0137] The hardening coating is composed of the following components in parts by weight:

[0138]

[0139] (5) The composite adhesive layer 9 obtained in step (3) is bonded to the shell 10 obtained in step (4). During bonding, the optically transparent adhesive layer 3 in the composite adhesive layer 9 is bonded to the surface of the optical PC film 2 in the shell 10 obtained in step (4), thereby obtaining the PC protective case for mobile phone screen protection composed of the composite adhesive layer 9 and the shell 10.

[0140] This embodiment also provides a PC protective shell for protecting a mobile phone screen. Figure 1 As shown, the PC protective shell for protecting the mobile phone screen includes a shell 10 and a composite adhesive layer 9 attached to the surface of the shell 10.

[0141] The housing 10 includes an optical PC film 2 and a hardening coating 1 located on the surface of the optical PC film 2. The thickness of the optical PC film 2 is 200 μm, and the thickness of the hardening coating 1 is 5 μm.

[0142] The composite adhesive layer 9 includes an optically transparent adhesive layer 3, an optical film layer 4, a soft adhesive layer 5 and a release film 8 which are stacked in sequence; the optically transparent adhesive layer 3 in the composite adhesive layer 9 is attached to the surface of the optical PC film 2 in the housing 10. The optically transparent adhesive layer 3 has a thickness of 60 μm; the optical film layer 4 adopts an SRF film, and the thickness of the optical film layer 4 is 80 μm; the soft adhesive layer 5 is an organic silicone pressure-sensitive adhesive, and the thickness of the soft adhesive layer 5 is 1.5 mm; the release film 8 includes a PET base film 7 and a release coating 6 coated on the surface of the base film, the release coating 6 is attached to the soft adhesive layer 5, the thickness of the PET base film 7 is 50 degrees, and the thickness of the release coating 6 is 0.5 μm.

[0143] When in use, the PET release film 8 is torn off, and the soft adhesive layer 5 of the PC protective shell for protecting the mobile phone screen is attached to the surface of the mobile phone screen.

[0144] Comparative Example 1

[0145] The difference between this comparative example and Example 1 is that the weight portion of the epoxy acrylate resin in the hardening coating is adjusted to 45 parts, and the other process conditions and operation steps are exactly the same as those in Example 1.

[0146] Comparative Example 2

[0147] The difference between this comparative example and Example 1 is that the weight of the epoxy acrylate resin in the hardening coating is adjusted to 65 parts, and the other process conditions and operation steps are exactly the same as those in Example 1.

[0148] Comparative Example 3

[0149] The difference between this comparative example and Example 1 is that the weight portion of the polyurethane acrylate resin in the hardening coating is adjusted to 15 parts, and the other process conditions and operation steps are exactly the same as those in Example 1.

[0150] Comparative Example 4

[0151] The difference between this comparative example and Example 1 is that the weight portion of the polyurethane acrylate resin in the hardening coating is adjusted to 35 parts, and the other process conditions and operation steps are exactly the same as those in Example 1.

[0152] Comparative Example 5

[0153] The difference between this comparative example and Example 1 is that the weight portion of the methyl methacrylate resin in the hardening coating is adjusted to 3 parts, and the other process conditions and operation steps are exactly the same as those in Example 1.

[0154] Comparative Example 6

[0155] The difference between this comparative example and Example 1 is that the weight of the methyl methacrylate resin in the hardening coating is adjusted to 12 parts, and the other process conditions and operation steps are exactly the same as those in Example 1.

[0156] Comparative Example 7

[0157] The difference between this comparative example and Example 1 is that the weight portion of hydroxyethyl acrylate in the hardening coating is adjusted to 3 parts, and the other process conditions and operation steps are exactly the same as those in Example 1.

[0158] Comparative Example 8

[0159] The difference between this comparative example and Example 1 is that the weight portion of hydroxyethyl acrylate in the hardening coating is adjusted to 12 parts, and the other process conditions and operation steps are exactly the same as those in Example 1.

[0160] The various properties of the PC protective shells for mobile phone screen protection prepared in Examples 1-5 and Comparative Examples 1-8 were tested:

[0161] (1) Light transmittance

[0162] According to the national standard GB / T 2410-2008 “Determination of light transmittance and haze of transparent plastics”, the light transmittance of the PC protective cases for mobile phone screen protection prepared in Examples 1-5 and Comparative Examples 1-8 was tested.

[0163] (2) Hardness

[0164] According to GB / T 6739-2022 “Determination of paint film hardness by pencil method for paints and varnishes”, the pencil hardness of the PC protective cases for mobile phone screen protectors prepared in Examples 1-5 and Comparative Examples 1-8 was tested.

[0165] (3) Wear resistance

[0166] Use steel wool with a weight of 1000g to rub the surface of the PC protective case at a stroke speed of 60mm / min. Stop rubbing when obvious scratches appear on the surface of the PC protective case and record the number of frictions.

[0167] (4) Hydrophobicity

[0168] The water contact angles on the surfaces of the PC protective shells for mobile phone screen protection prepared in Examples 1-5 and Comparative Examples 1-8 were measured using a water contact angle meter. The larger the water contact angle value, the higher the hydrophobicity of the PC protective shell.

[0169] The test results are shown in Table 1.

[0170] Table 1: Test results

[0171]

[0172]

[0173] It can be seen from the test data provided in Table 1 that the PC protective case prepared by the present invention has excellent light transmittance, hardness, wear resistance and hydrophobicity, and can provide all-round and multi-level protection for the mobile phone screen. It not only ensures that the visual experience of the mobile phone screen is not affected, but also greatly enhances the durability and practicality of the mobile phone.

[0174] The light transmittance of the PC protective case prepared by the present invention is as high as over 92%, which is far higher than the average level of similar products on the market. The high light transmittance means that after the user installs the protective case on the mobile phone screen, there will be almost no visual obstruction or color distortion, and the original picture quality of the mobile phone screen can be perfectly preserved. Whether browsing high-definition pictures, watching videos or playing games, you can enjoy a clear view as if there is no protective case installed, bringing an immersive visual feast to the user.

[0175] After rigorous testing, the friction times of the PC protective shell prepared by the present invention can reach more than 500 times, which fully proves its excellent wear resistance. In daily use, the mobile phone screen will inevitably be rubbed by hard objects such as keys and coins, and the PC protective shell prepared by the present invention can effectively resist external wear and tear, and can keep the surface smooth and clean even after long-term use, greatly extending the service life of the mobile phone screen, reducing the frequency of replacing the protective shell, and saving costs for users.

[0176] Hardness is an important indicator for measuring the impact resistance of a protective case. The hardness of the PC protective case prepared by the present invention can reach above 1H, which means that it can effectively resist damage caused by accidental falls or collisions and provide strong physical protection for the mobile phone screen.

[0177] The water contact angle of the PC protective shell prepared by the present invention exceeds 100°, which indicates that the product has excellent hydrophobicity. This property enables the surface of the protective shell to quickly form liquid droplets and slide down when encountering water or oil, and is not easy to remain, thereby effectively avoiding the adhesion of stains such as fingerprints and sweat stains, and maintaining the cleanliness of the protective shell.

[0178] It can be seen from the test data of Example 1 and Comparative Examples 1-8 that the addition amount of epoxy acrylate resin, polyurethane acrylate resin, methyl methacrylate resin and hydroxyethyl acrylate in the hardened coating will directly affect the transmittance, hardness, number of frictions and water contact angle of the hardened coating. Only when the addition amount of epoxy acrylate resin, polyurethane acrylate resin, methyl methacrylate resin and hydroxyethyl acrylate is within the numerical range specified in the present invention, can a hardened coating with ideal performance be obtained.

[0179] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. A PC protective shell for protecting a mobile phone screen, characterized in that: The PC protective shell for protecting the mobile phone screen comprises a shell and a composite adhesive layer attached to the surface of the shell; The housing comprises an optical PC film and a hardened coating on the surface of the optical PC film; the composite adhesive layer comprises an optically transparent adhesive layer, an optical film layer, a soft adhesive layer and a release film stacked in sequence; the optically transparent adhesive layer in the composite adhesive layer is attached to the surface of the optical PC film in the housing; When in use, the release film is torn off, and the soft adhesive layer of the PC protective shell for protecting the mobile phone screen is attached to the surface of the mobile phone screen.

2. The PC protective case for mobile phone screen protection according to claim 1, characterized in that: The thickness of the optical PC film is 100 to 200 μm; Spraying a hardening coating on one side of the optical PC film, and obtaining the hardened coating after light curing; The thickness of the hardened coating is 3-5 μm.

3. The PC protective case for mobile phone screen protection according to claim 1, characterized in that: The optically transparent adhesive layer is acrylic pressure-sensitive adhesive; The thickness of the optically transparent adhesive layer is 50 to 60 μm; The optical film layer is any one of PET film, CPP film, TAC film or SRF film; The thickness of the optical film layer is 50 to 80 μm; The soft adhesive layer is a silicone pressure-sensitive adhesive; The thickness of the soft rubber layer is 0.5 to 1.5 mm; The release film comprises a PET base film and a release coating coated on the surface of the base film, and the release coating is bonded to the soft adhesive layer; The thickness of the PET base film is 30 to 50 μm; The release coating has a thickness of 0.2-0.5 μm.

4. A method for preparing a PC protective shell for mobile phone screen protection according to any one of claims 1 to 3, characterized in that: The preparation method comprises: (1) uniformly coating a release agent on a surface of a PET base film, and drying the PET base film to form a release coating on the surface of the PET base film, thereby obtaining a release film consisting of the PET base film and the release coating; (2) coating a silicone pressure-sensitive adhesive on one side of the optical film layer, and forming a soft adhesive layer on the one side of the optical film layer after high-temperature curing, and laminating the release film obtained in step (1) to the soft adhesive layer, and laminating the release coating in the release film to the surface of the soft adhesive layer; (3) coating an acrylic pressure-sensitive adhesive on the other side of the optical film layer, and forming an optically transparent adhesive layer on the other side of the optical film layer after high-temperature curing, thereby obtaining a composite adhesive layer consisting of the optically transparent adhesive layer, the optical film layer, the soft adhesive layer and the release film; (4) using polycarbonate powder as a raw material, preparing an optical PC film by a mold hot pressing molding process according to the size of the mobile phone screen, coating a hardening coating on one side of the optical PC film, and performing photocuring after drying to form a hardened coating on one side of the optical PC film, thereby obtaining a housing consisting of the optical PC film and the hardened coating; (5) bonding the composite adhesive layer obtained in step (3) to the shell obtained in step (4); during bonding, bonding the optically transparent adhesive layer in the composite adhesive layer to the surface of the optical PC film in the shell obtained in step (4), thereby obtaining the PC protective case for mobile phone screen protection consisting of the composite adhesive layer and the shell.

5. The preparation method according to claim 4, characterized in that: In step (2), the high temperature curing temperature of the silicone pressure-sensitive adhesive is 150-160° C.; The high temperature curing time of the organic silicone pressure-sensitive adhesive is 120 to 180 seconds.

6. The preparation method according to claim 4, characterized in that: In step (3), the high temperature curing temperature of the acrylic pressure-sensitive adhesive is 100-120° C.; The high temperature curing time of the acrylic pressure-sensitive adhesive is 90 to 120 seconds.

7. The preparation method according to claim 4, characterized in that: In step (4), the drying temperature of the hardened coating is 80 to 90°C; The drying time of the hardened coating is 90 to 120 seconds; The UV light intensity used for the photocuring of the hardened coating is 300-500 MJ / cm 2 ; The light curing time of the hardened coating is 60 to 80 seconds.

8. The preparation method according to claim 4, characterized in that: In step (4), the hardened coating is composed of the following components in parts by weight: The coupling agent includes KH550, KH560 or KH570; The photoinitiator includes any one of 2-hydroxy-2-methyl-1-phenyl-1-propanone, 1-hydroxycyclohexyl phenyl ketone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, benzoin dimethyl ether or isooctyl p-dimethylaminobenzoate or a combination of at least two thereof; The organic solvent includes any one of acetone, tetrahydrofuran, ethyl acetate, butyl acetate or isopropyl acetate, or a combination of at least two thereof.

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