Self-adapting curved flexible protective film and production process thereof

Abstract

The application discloses a self-adaptive bending flexible protective film and a production process thereof, and belongs to the technical field of flexible protective films, which comprises a substrate layer, an optical adhesive layer and a flexible film layer, wherein the optical adhesive layer is arranged on the substrate layer, and the flexible film layer is arranged on the optical adhesive layer. The application can solve the problem of poor use effect of the existing flexible protective film due to the fact that the flexible protective film cannot be self-adaptively bent according to use requirements. The upper elastic layer, the elastic deformation layer and the lower elastic layer are elastically connected by arranging the upper elastic bump into the upper buffer groove and arranging the lower elastic bump into the lower buffer groove, the traction force borne by the flexible protective film can be buffered to a certain extent by the staggered arrangement of the upper elastic bump and the lower elastic bump, the flexible protective film is good in flexibility and strong in elastic force during use, can be self-adaptively bent according to use requirements, the self-adaptive bending degree of the flexible protective film is improved, and the use effect of the flexible protective film is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flexible protective film, in particular to a self-adaptive bending flexible protective film and a production process thereof. BACKGROUND

[0002] Optical thin film is a kind of optical medium material composed of thin layered medium, and the light beam is propagated through the interface. The application of optical thin film began in the 1930s. At present, optical thin film has been widely used in optical and optoelectronic technology fields to manufacture various optical instruments.

[0003] The characteristics of optical thin film are as follows: the surface is smooth, the interface between the film layers is geometrically divided; the refractive index of the film layer can jump at the interface, but it is continuous within the film layer; it can be a transparent medium or an absorbing medium; it can be normal uniform or normal non-uniform; among them, the flexible protective film is one of the optical thin films, and is particularly widely used.

[0004] The existing flexible protective film has poor self-adaptive bending degree when in use, because the flexible protective film cannot be self-adaptively bent according to the use requirement, thereby resulting in poor use effect of the flexible protective film. SUMMARY

[0005] The present application aims to provide a self-adaptive bending flexible protective film and a production process thereof, which can be self-adaptively bent according to the use requirement, improve the self-adaptive bending degree of the flexible protective film, improve the use effect of the flexible protective film, and solve the problems proposed in the above background technology.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0007] A self-adaptive bending flexible protective film, comprising a substrate layer, an optical adhesive layer and a flexible film layer, the upper surface of the substrate layer is provided with the optical adhesive layer, and the upper surface of the optical adhesive layer is provided with the flexible film layer, wherein the thickness ratio of the substrate layer, the optical adhesive layer and the flexible film layer is 1:1:1-2.

[0008] Preferably, the substrate layer comprises the following raw materials in mass fraction: polyethylene 200-300 parts, modified silicon carbide 16-25 parts, silicon acid polymer powder 2-4 parts, dispersing agent 5-8 parts, polyvinyl alcohol 30-45 parts, glyceryl triacetate 12-21 parts, dioctyl phthalate 6-12 parts, diethylene glycol 18-32 parts and deionized water 40-68 parts.

[0009] Preferably, the dispersing agent is any one of triethylhexyl phosphate, sodium dodecyl sulfate and methylamyl alcohol.

[0010] Preferably, the optical adhesive layer is a silica gel pressure-sensitive adhesive, wherein the silica gel pressure-sensitive adhesive comprises the following raw materials in mass fraction: methylphenyl vinyl silicone rubber 100-120 parts, methyl polysiloxane resin 120-180 parts, ammonium polyphosphate 20-50 parts, organic tin condensation catalyst 2-4 parts, benzoyl peroxide 1-2 parts, and toluene 200-300 parts.

[0011] Preferably, the flexible film layer comprises an upper elastic layer, a resilient deformation layer, and a lower elastic layer, the upper surface of the resilient deformation layer is provided with the upper elastic layer, and the lower surface of the resilient deformation layer is provided with the lower elastic layer.

[0012] Preferably, the top of the resilient deformation layer is provided with upper resilient protrusions, the bottom of the resilient deformation layer is provided with lower resilient protrusions, the upper resilient protrusions and the lower resilient protrusions are distributed at equal intervals, and the upper resilient protrusions and the lower resilient protrusions are staggered.

[0013] Preferably, the bottom of the upper elastic layer is provided with upper buffer grooves for mounting the upper resilient protrusions, and the upper elastic layer is connected with the resilient deformation layer by mounting the upper resilient protrusions into the upper buffer grooves.

[0014] Preferably, the bottom of the lower elastic layer is provided with lower buffer grooves for mounting the lower resilient protrusions, and the lower elastic layer is connected with the resilient deformation layer by mounting the lower resilient protrusions into the lower buffer grooves.

[0015] Preferably, the upper elastic layer, the resilient deformation layer, and the lower elastic layer each comprise the following raw materials in mass fraction: thermoplastic polyurethane elastomer 20-36 parts, low-density polyethylene 24-42 parts, and auxiliary agent 3-12 parts.

[0016] According to another aspect of the present application, a production process of the self-adaptive bending flexible protective film is provided, comprising the following steps:

[0017] S1, producing a substrate layer:

[0018] Polyethylene, modified silicon carbide, silicic acid polymer powder, dispersing agent, polyvinyl alcohol, glyceryl triacetate, dioctyl phthalate, diethylene glycol, and deionized water are added into an extruder, and after stirring, mixing, plasticizing, and compacting by the extruder, a pre-product with a certain shape is extruded from the head of the extruder, the pre-product is repeatedly extruded and stretched by a calender, and the stretched product is processed to form a substrate layer with uniform thickness.

[0019] S2, producing an optical adhesive layer:

[0020] Methyl phenyl vinyl silicone rubber and toluene are added into a reactor, nitrogen is passed, methyl polysiloxane resin, ammonium polyphosphate, organic tin condensation catalyst and benzoyl peroxide are added, heating, stirring, mixing, and cooling to form a silicone pressure-sensitive adhesive, which is sprayed to form an optical adhesive layer;

[0021] S3, producing a flexible film layer:

[0022] Thermoplastic polyurethane elastomer, low-density polyethylene and additives are added into an extruder, and after stirring, mixing, plasticizing and compacting in the extruder, a pre-product is extruded, and the pre-product is repeatedly extruded and stretched in a calender to form an upper elastic layer, a rebound deformation layer and a lower elastic layer;

[0023] The upper elastic layer is processed to form an upper buffer groove at the bottom of the upper elastic layer;

[0024] The rebound deformation layer is processed to form an upper rebound protrusion at the top of the rebound deformation layer and a lower rebound protrusion at the bottom of the rebound deformation layer, and the processed upper rebound protrusions and lower rebound protrusions are staggered;

[0025] The lower elastic layer is processed to form a lower buffer groove at the top of the lower elastic layer;

[0026] The upper rebound protrusions are fitted into the upper buffer grooves to connect the upper elastic layer and the rebound deformation layer, and the lower rebound protrusions are fitted into the lower buffer grooves to connect the lower elastic layer and the rebound deformation layer, forming a flexible film layer;

[0027] S4, producing a flexible protective film:

[0028] The optical adhesive layer is arranged on the base layer, and the flexible film layer is arranged on the optical adhesive layer, and after laminating, a flexible protective film is formed.

[0029] Compared with the prior art, the present application has the following advantages:

[0030] By fitting the upper rebound protrusions into the upper buffer grooves and the lower rebound protrusions into the lower buffer grooves, the upper elastic layer, the rebound deformation layer and the lower elastic layer are elastically connected, and the upper rebound protrusions and the lower rebound protrusions staggered can buffer the traction force received by the flexible protective film to a certain extent. In use, the flexible protective film has good flexibility and strong rebound force, can be self-adaptively bent according to the use requirements, improves the self-adaptively bending degree of the flexible protective film, and improves the use effect of the flexible protective film. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a front view of the self-adaptively bent flexible protective film of the present application;

[0032] Figure 2 is an expanded view of the self-adaptively bent flexible protective film of the present application;

[0033] Figure 3 A cross-sectional view of the self-adapting flexible protective film of the present application;

[0034] Figure 4 A cross-sectional exploded view of the self-adapting flexible protective film of the present application;

[0035] Figure 5 An enlarged view of A in the self-adapting flexible protective film of the present application. Figure 3

[0036] In the figure: 1, base layer; 2, optical adhesive layer; 3, flexible film layer; 31, upper elastic layer; 311, upper buffer groove; 32, rebound deformation layer; 321, upper rebound bump; 322, lower rebound bump; 33, lower elastic layer; 331, lower buffer groove. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0038] To solve the problem that the existing flexible protective film cannot be self-adaptingly curved according to the use requirements, the self-adapting flexibility of the flexible protective film is poor, and the use effect of the flexible protective film is poor, please refer to Figures 1-5 The technical solutions of the present embodiment are as follows:

[0039] Embodiment one

[0040] A self-adapting flexible protective film, comprising a base layer 1, an optical adhesive layer 2 and a flexible film layer 3, the upper surface of the base layer 1 is provided with the optical adhesive layer 2, the upper surface of the optical adhesive layer 2 is provided with the flexible film layer 3, wherein the thickness ratio of the base layer 1, the optical adhesive layer 2 and the flexible film layer 3 is 1:1:2.

[0041] In the present embodiment, the base layer 1 comprises the following raw materials in mass fraction: polyethylene 200 parts, modified silicon carbide 16 parts, silicon acid polymer powder 2 parts, dispersant 5 parts, polyvinyl alcohol 30 parts, glyceryl triacetate 12 parts, dioctyl phthalate 6 parts, diethylene glycol 18 parts and deionized water 40 parts.

[0042] In the present embodiment, the dispersant is triethylhexyl phosphate.

[0043] ​In the embodiment, the optical adhesive layer 2 is a silica gel pressure-sensitive adhesive, wherein the silica gel pressure-sensitive adhesive comprises the following raw materials in mass fraction: methyl phenyl vinyl silicone rubber 100 parts, methyl polysiloxane resin 120 parts, ammonium polyphosphate 20 parts, organic tin condensation catalyst 2 parts, benzoyl peroxide 1 part, and toluene 200 parts.

[0044] In the embodiment, the flexible film layer 3 comprises an upper elastic layer 31, a resilient deformation layer 32, and a lower elastic layer 33, the upper surface of the resilient deformation layer 32 is provided with the upper elastic layer 31, and the lower surface of the resilient deformation layer 32 is provided with the lower elastic layer 33.

[0045] In the embodiment, the top of the resilient deformation layer 32 is provided with an upper resilient bump 321, and the bottom of the resilient deformation layer 32 is provided with a lower resilient bump 322, the upper resilient bump 321 and the lower resilient bump 322 are distributed at equal intervals, and the upper resilient bump 321 and the lower resilient bump 322 are staggered.

[0046] In the embodiment, the bottom of the upper elastic layer 31 is provided with an upper buffer groove 311 for installing the upper resilient bump 321, and the upper elastic layer 31 is connected with the resilient deformation layer 32 by installing the upper resilient bump 321 into the upper buffer groove 311.

[0047] In the embodiment, the bottom of the lower elastic layer 33 is provided with a lower buffer groove 331 for installing the lower resilient bump 322, and the lower elastic layer 33 is connected with the resilient deformation layer 32 by installing the lower resilient bump 322 into the lower buffer groove 331.

[0048] It should be noted that, by installing the upper resilient bump 321 into the upper buffer groove 311 and installing the lower resilient bump 322 into the lower buffer groove 331, the upper elastic layer 31, the resilient deformation layer 32, and the lower elastic layer 33 can be elastically connected, and the upper resilient bump 321 and the lower resilient bump 322 staggered can buffer the traction force received by the flexible protective film to a certain extent, in use, the flexible protective film has good flexibility and strong resilience, can be self-adaptively bent according to the use requirement, improves the self-adaptive bending degree of the flexible protective film, and improves the use effect of the flexible protective film.

[0049] In the embodiment, the upper elastic layer 31, the resilient deformation layer 32, and the lower elastic layer 33 each comprise the following raw materials in mass fraction: thermoplastic polyurethane elastomer 20 parts, low-density polyethylene 24 parts, and auxiliary agent 3 parts.

[0050] It should be noted that the thermoplastic polyurethane elastomer, also known as thermoplastic polyurethane rubber, is a (AB)n type block linear polymer, A is a high molecular weight polyester or polyether, B is a diol containing 2-12 straight-chain carbon atoms, the chemical structure between AB segments is diisocyanate, and has high toughness, wear resistance, oil resistance, and other excellent comprehensive properties.

[0051] It should be noted that low density polyethylene is also called high pressure polyethylene, which is the lightest variety of polyethylene resin, has good softness, elongation, electrical insulation, transparency, easy processability and certain air permeability, and has good chemical stability.

[0052] Therefore, the use of thermoplastic polyurethane elastomer, low density polyethylene and additives to produce the upper elastic layer 31, the rebound deformation layer 32 and the lower elastic layer 33 can improve the softness and resilience of the flexible film layer 3, so that the flexible protective film has good flexibility and strong resilience, and can be self-adaptively bent according to the use requirement, thereby improving the self-adaptive bending degree of the flexible protective film and improving the use effect of the flexible protective film.

[0053] In order to better show the production process of a self-adaptive bending flexible protective film, the embodiment provides a production process of a self-adaptive bending flexible protective film, which comprises the following steps:

[0054] S1, producing the base layer 1:

[0055] The polyethylene, modified silicon carbide, silicon acid polymer powder, dispersing agent, polyvinyl alcohol, glyceryl triacetate, dioctyl phthalate, diethylene glycol and deionized water are added into the extruder, and after stirring, mixing, plasticizing and compacting in the extruder, a pre-product with a certain shape is extruded from the head of the extruder. The pre-product is repeatedly extruded and stretched by the calender, and the stretched product is processed to form the base layer 1 with uniform thickness;

[0056] S2, producing the optical adhesive layer 2:

[0057] The methylphenylvinyl silicone raw rubber and toluene are added into the reactor, nitrogen is introduced, methylpolysiloxane resin, ammonium polyphosphate, organic tin condensation catalyst and benzoyl peroxide are added, heated and stirred to mix uniformly, and after cooling, the silicone pressure sensitive adhesive is formed. After spraying, the optical adhesive layer 2 is formed;

[0058] S3, producing the flexible film layer 3:

[0059] The thermoplastic polyurethane elastomer, low density polyethylene and additives are added into the extruder, and after stirring, mixing, plasticizing and compacting in the extruder, the pre-product is extruded. The pre-product is repeatedly extruded and stretched by the calender to form the upper elastic layer 31, the rebound deformation layer 32 and the lower elastic layer 33;

[0060] The upper elastic layer 31 is processed to form the upper buffer groove 311 at the bottom of the upper elastic layer 31;

[0061] The rebound deformation layer 32 is processed to form an upper rebound bump 321 on the top of the rebound deformation layer 32, to form a lower rebound bump 322 on the bottom of the rebound deformation layer 32, and to stagger the processed upper rebound bump 321 and the lower rebound bump 322;

[0062] The lower elastic layer 33 is processed to form a lower buffer groove 331 on the top of the lower elastic layer 33;

[0063] The upper rebound bump 321 is fitted into the upper buffer groove 311 to connect the upper elastic layer 31 and the rebound deformation layer 32, and the lower rebound bump 322 is fitted into the lower buffer groove 331 to connect the lower elastic layer 33 and the rebound deformation layer 32, thereby forming the flexible film layer 3;

[0064] S4, producing a flexible protective film:

[0065] The optical adhesive layer 2 is arranged on the base layer 1, and the flexible film layer 3 is arranged on the optical adhesive layer 2, and after lamination, a flexible protective film is formed.

[0066] Example Two

[0067] A self-adaptive bending flexible protective film comprises a base layer 1, an optical adhesive layer 2, and a flexible film layer 3, the upper surface of the base layer 1 is provided with the optical adhesive layer 2, and the upper surface of the optical adhesive layer 2 is provided with the flexible film layer 3, wherein the thickness ratio of the base layer 1, the optical adhesive layer 2, and the flexible film layer 3 is 1:1:2.

[0068] In this embodiment, the base layer 1 comprises the following raw materials in mass fraction: 200 parts of polyethylene, 16 parts of modified silicon carbide, 2 parts of silicic acid polymer powder, 5 parts of dispersant, 30 parts of polyvinyl alcohol, 12 parts of glyceryl triacetate, 6 parts of dioctyl phthalate, 18 parts of diethylene glycol, and 40 parts of deionized water.

[0069] In this embodiment, the dispersant is triethylhexyl phosphate.

[0070] In this embodiment, the optical adhesive layer 2 is a silicone pressure-sensitive adhesive, wherein the silicone pressure-sensitive adhesive comprises the following raw materials in mass fraction: 100 parts of methylphenylvinyl silicone raw rubber, 120 parts of methylpolysiloxane resin, 20 parts of ammonium polyphosphate, 2 parts of organotin condensation catalyst, 1 part of benzoyl peroxide, and 200 parts of toluene.

[0071] In this embodiment, the flexible film layer 3 comprises an upper elastic layer 31, a rebound deformation layer 32, and a lower elastic layer 33, the upper surface of the rebound deformation layer 32 is provided with the upper elastic layer 31, and the lower surface of the rebound deformation layer 32 is provided with the lower elastic layer 33.

[0072] In the embodiment, the upper elastic layer 31, the resilient deformation layer 32 and the lower elastic layer 33 each comprise raw materials in the following mass fractions: thermoplastic polyurethane elastomer 20 parts, low-density polyethylene 24 parts and auxiliary agent 3 parts.

[0073] Compared with Example One, the structure of the upper resilient bump 321 and the lower resilient bump 322 is cancelled in Example Two, and the flexible protective film is produced by using the same production process as that of Example One, and the production steps of the upper resilient bump 321 and the lower resilient bump 322 are cancelled accordingly.

[0074] Comparative Example

[0075] A self-adaptive bending flexible protective film comprises a substrate layer 1.

[0076] In the embodiment, the substrate layer 1 comprises raw materials in the following mass fractions: polyethylene 200 parts, modified silicon carbide 16 parts, silicon acid polymer powder 2 parts, dispersant 5 parts, polyvinyl alcohol 30 parts, glyceryl triacetate 12 parts, dioctyl phthalate 6 parts, diethylene glycol 18 parts and deionized water 40 parts.

[0077] In the embodiment, the dispersant is triethylhexyl phosphoric acid.

[0078] Compared with Example Two, the structure of the optical adhesive layer 2 and the flexible film layer 3 is cancelled in the comparative example, and the flexible protective film is produced by using the same production process as that of Example Two, and the production steps of the optical adhesive layer 2 and the flexible film layer 3 are cancelled accordingly.

[0079] The flexible protective films produced in Examples 1-2 and the comparative example are subjected to performance tests, and the performance test results of the flexible protective films are shown in Table 1.

[0080] Table 1: Performance test results of the flexible protective film

[0081]

[0082]

[0083] Therefore, it can be known from the above table that the flexible protective films produced in Examples 1-2 all have good softness, resilience and self-adaptive bending performance.

[0084] Among them, compared with Example One, the softness, resilience and self-adaptive bending performance of Example Two are all reduced. Since the upper resilient bump 321 and the lower resilient bump 322 are not added in Example Two, the softness, resilience and self-adaptive bending performance of the flexible protective film are all reduced, which indicates that the upper resilient bump 321 and the lower resilient bump 322 can improve the softness, resilience and self-adaptive bending performance of the flexible protective film.

[0085] Compared with Example 2, the softness, resilience and self-adaptive bending performance of the comparative example are all reduced. Since the flexible film layer 3 is not added in the comparative example, the softness, resilience and self-adaptive bending performance of the flexible protective film are all reduced. It is shown that the flexible film layer 3 can improve the softness, resilience and self-adaptive bending performance of the flexible protective film.

[0086] Therefore, by installing the upper resilient protrusions 321 into the upper buffer grooves 311 and installing the lower resilient protrusions 322 into the lower buffer grooves 331, the upper elastic layer 31, the resilient deformation layer 32 and the lower elastic layer 33 are elastically connected. The upper resilient protrusions 321 and the lower resilient protrusions 322 staggered arranged can buffer the traction force received by the flexible protective film to a certain extent. In use, the flexible protective film has good flexibility and strong resilience, can be self-adaptively bent according to the use requirement, and the self-adaptive bending degree of the flexible protective film is improved, and the use effect of the flexible protective film is improved.

[0087] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0088] Although the embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A flexible protective film with adaptive bending, comprising a base layer (1), an optical adhesive layer (2), and a flexible film layer (3), characterized in that, An optical adhesive layer (2) is provided on the upper surface of the substrate layer (1), and a flexible film layer (3) is provided on the upper surface of the optical adhesive layer (2), wherein the thickness ratio of the substrate layer (1), the optical adhesive layer (2) and the flexible film layer (3) is 1:1:1-2; The flexible membrane layer (3) includes an upper elastic layer (31), a resilient deformation layer (32) and a lower elastic layer (33). The upper elastic layer (31) is disposed on the upper surface of the resilient deformation layer (32), and the lower elastic layer (33) is disposed on the lower surface of the resilient deformation layer (32). The top of the elastic deformation layer (32) is provided with an upper elastic protrusion (321), and the bottom of the elastic deformation layer (32) is provided with a lower elastic protrusion (322). The upper elastic protrusion (321) and the lower elastic protrusion (322) are evenly distributed, and the upper elastic protrusion (321) and the lower elastic protrusion (322) are arranged alternately. The bottom of the upper elastic layer (31) is provided with an upper buffer groove (311) for installing the upper rebound protrusion (321). The upper elastic layer (31) is connected to the rebound deformation layer (32) by installing the upper rebound protrusion (321) into the upper buffer groove (311). The bottom of the lower elastic layer (33) is provided with a lower buffer groove (331) for installing the lower rebound protrusion (322). The lower elastic layer (33) is connected to the rebound deformation layer (32) by installing the lower rebound protrusion (322) into the lower buffer groove (331). The upper elastic layer (31), the resilient deformation layer (32), and the lower elastic layer (33) each comprise the following parts by weight of raw materials: 20-36 parts of thermoplastic polyurethane elastomer, 24-42 parts of low-density polyethylene, and 3-12 parts of additives.

2. The adaptive bending flexible protective membrane according to claim 1, characterized in that, The base layer (1) comprises the following raw materials in parts by weight: 200-300 parts of polyethylene, 16-25 parts of modified silicon carbide, 2-4 parts of silicate polymer powder, 5-8 parts of dispersant, 30-45 parts of polyvinyl alcohol, 12-21 parts of triacetin, 6-12 parts of dioctyl phthalate, 18-32 parts of diethylene glycol, and 40-68 parts of deionized water.

3. The adaptive bending flexible protective membrane according to claim 2, characterized in that, The dispersant is any one of triethylhexylphosphate, sodium dodecyl sulfate, and methylpentanol.

4. The adaptive bending flexible protective membrane according to claim 3, characterized in that, The optical adhesive layer (2) is a silicone pressure-sensitive adhesive, wherein the silicone pressure-sensitive adhesive comprises the following raw materials in parts by weight: 100-120 parts of methyl phenyl vinyl silicone raw rubber, 120-180 parts of methyl polysiloxane resin, 20-50 parts of ammonium polyphosphate, 2-4 parts of organotin condensation catalyst, 1-2 parts of benzoyl peroxide and 200-300 parts of toluene.

5. A manufacturing process for an adaptive bending flexible protective film according to claim 4, characterized in that, Includes the following steps: S1, Production base layer (1): Polyethylene, modified silicon carbide, silica polymer powder, dispersant, polyvinyl alcohol, triacetin, dioctyl phthalate, diethylene glycol and deionized water are added to an extruder. After being stirred, mixed, plasticized and compressed in the extruder, a pre-product of a certain shape is extruded from the die head of the extruder. The pre-product is repeatedly squeezed and stretched in a calender, and the stretched product is processed to form a base layer of uniform thickness (1). S2, Production of optical adhesive layer (2): Methylphenyl vinyl silicone raw rubber and toluene were added to the reactor, nitrogen gas was introduced, and methyl polysiloxane resin, ammonium polyphosphate, organotin condensation catalyst and benzoyl peroxide were added. The mixture was heated and stirred to make it uniform. After cooling, a silicone pressure-sensitive adhesive was formed. After spraying, an optical adhesive layer was formed (2). S3, Production of flexible membrane layer (3): Thermoplastic polyurethane elastomer, low-density polyethylene and additives are added to an extruder. After being stirred, mixed, plasticized and compressed by the extruder, the pre-product is extruded. The pre-product is repeatedly squeezed and stretched by a calender to form an upper elastic layer (31), a spring-loaded deformation layer (32) and a lower elastic layer (33). The upper elastic layer (31) is processed to create an upper buffer groove (311) at the bottom of the upper elastic layer (31). The spring-loaded deformation layer (32) is processed to form an upper spring-loaded bump (321) at the top of the spring-loaded deformation layer (32) and a lower spring-loaded bump (322) at the bottom of the spring-loaded deformation layer (32), and the processed upper spring-loaded bump (321) and lower spring-loaded bump (322) are arranged alternately. The lower elastic layer (33) is processed to create a lower buffer groove (331) on the top of the lower elastic layer (33). The upper spring protrusion (321) is inserted into the upper buffer groove (311) to connect the upper elastic layer (31) and the spring deformation layer (32). The lower spring protrusion (322) is inserted into the lower buffer groove (331) to connect the lower elastic layer (33) and the spring deformation layer (32) to form a flexible film layer (3). S4. Production of flexible protective film: An optical adhesive layer (2) is placed on a base layer (1), and a flexible film layer (3) is placed on the optical adhesive layer (2). After lamination, a flexible protective film is formed.

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