Preparation method of layered wave-absorbing, shielding and light-transmitting film and layered wave-absorbing, shielding and light-transmitting film

Abstract

The present invention belongs to the technical field of thin films for display windows, and proposes a method for preparing a layered wave-absorbing, shielding and light-transmitting film, comprising the following steps: S1, cutting a PET base layer into corresponding sizes; S2, preparing a shielding layer on one side of the PET base layer; S3, preparing a dielectric layer on the side of the shielding layer away from the PET base layer; S4, preparing an absorbing layer on the side of the dielectric layer away from the shielding layer; S5, preparing a hardening layer on the side of the absorbing layer away from the dielectric layer. The present invention also proposes a layered wave-absorbing, shielding and light-transmitting film, comprising a PET base layer, a shielding layer, a dielectric layer, an absorbing layer and a hardening layer fixedly connected in sequence from the inside to the outside, the shielding layer is a nano-conductive material, and the absorbing layer is a ferrite absorbing nano-material. The above technical scheme solves the problem of the thickness of the existing shielding and light-transmitting films.

Description

Technical Field

[0001] The invention relates to the technical field of thin films for display windows, and in particular to a method for preparing a layered wave-absorbing, shielding and light-transmitting thin film and the layered wave-absorbing, shielding and light-transmitting thin film. Background Art

[0002] In the field of EMC electromagnetic compatibility, a large number of electromagnetic shielding materials are needed, including equipment housing materials, shielding coatings, power filtering, wire shielding, gap filling, shielding springs, shielding rubber strips, etc., as well as the layout design of all electronic components to meet the requirements of electromagnetic compatibility. In this type of equipment that achieves electromagnetic compatibility goals, all display windows, human-machine interface display terminals, observation windows, etc. need to use light-transmitting shielding materials to ensure both light transmission and shielding.

[0003] At present, general light-transmitting shielding materials only solve the problem of light-transmitting shielding. In the application scenarios where wave absorption and stealth are required, the conventional implementation method is to make the wave absorption function into a wave absorption structure layer separately, and then combine the multiple functions. Such a structure is difficult to achieve the goal of ultra-thinness in terms of overall thickness. Military products, especially individual handheld equipment, have strict requirements on the weight and size of equipment. Overall light weight and ultra-thin equipment have always been the research direction. Summary of the invention

[0004] One of the main purposes of the present invention is to provide a method for preparing a layered wave-absorbing, shielding and light-transmitting film to solve the problem that the existing shielding and light-transmitting film is thick and heavy.

[0005] The second main purpose of the present invention is to provide a layered wave-absorbing, shielding and light-transmitting film to solve the problem that the existing shielding and light-transmitting films are thick and heavy.

[0006] In order to solve the above technical problems, one of the purposes of the present invention is to adopt a technical solution that:

[0007] A method for preparing a layered wave-absorbing, shielding and light-transmitting film comprises the following steps:

[0008] S1, cutting the PET base layer into corresponding sizes;

[0009] S2, preparing a shielding layer on one side of the PET base layer;

[0010] S3, preparing a dielectric layer on the side of the shielding layer away from the PET base layer;

[0011] S4, preparing an absorbing layer on a side of the dielectric layer away from the shielding layer;

[0012] S5. Prepare a hardening layer on the side of the absorbing layer away from the dielectric layer.

[0013] As a further technical solution, step S2 includes:

[0014] S21, applying primer on one side of the PET base layer;

[0015] S22, printing nano-grooves on the primer by using a template;

[0016] S23, UV curing the printed nano-groove primer;

[0017] S24, filling nano-conductive ink into the nano-grooves;

[0018] S25, perform UV curing again.

[0019] As a further technical solution, step S4 includes:

[0020] S41, applying primer on one side of the dielectric layer;

[0021] S42, embossing a honeycomb groove on the base glue by using a template;

[0022] S43, UV curing the printed honeycomb groove primer;

[0023] S44, filling the honeycomb groove with ferrite wave-absorbing nano-slurry;

[0024] S45, perform UV curing again.

[0025] As a further technical solution, both step S22 and step S42 prepare nano-grooves and honeycomb-shaped grooves by using an imprinting device, and the imprinting device includes:

[0026] frame;

[0027] A conveyor belt assembly, which is arranged on the frame and is used to convey the PET base layer or the medium layer with the shielding layer and the PET base layer in sequence below;

[0028] The pressure seat is lifted and lowered on the frame and is located above the conveyor belt assembly. The template disassembly is arranged at the bottom of the pressure seat.

[0029] As a further technical solution, the template is disassembled and arranged at the bottom of the press seat through a clamping assembly, and the clamping assembly includes:

[0030] Clamping blocks, there are two clamping blocks, which are symmetrically arranged at the two ends of the bottom of the press seat, and connecting plates are vertically fixed at both ends of each clamping block, and a gap for clamping the template is set between the clamping block and the bottom surface of the press seat;

[0031] First sliding holes, there are four first sliding holes, which are respectively opened at both ends of the two side walls of the pressure seat, and the first sliding holes include a first strip hole, an inclined hole, and a second strip hole which are arranged in sequence from the end to the middle of the pressure seat, and the length directions of the first strip hole and the second strip hole are both arranged in the horizontal direction, the lower end of the inclined hole is connected to the first strip hole, and the high end of the inclined hole is connected to the second strip hole;

[0032] Slide rods, there are two slide rods, both of which are inserted into the pressure seat, and the two ends of each slide rod are respectively slidably set in the corresponding first slide hole, and extend from the first slide hole to be fixedly connected with the connecting plates at the two ends of the two clamping blocks;

[0033] There are two sliders, which are respectively arranged at the two ends inside the pressure seat and are both slidably arranged along the length direction of the first strip hole. A second sliding hole is opened through the middle of the slider. The second sliding hole is strip-shaped and the length direction is arranged along the vertical direction. The two sliding rods are respectively slidably arranged in the two second sliding holes.

[0034] As a further technical solution, two sliders are synchronously slidably arranged inside the press seat through a transmission device, and the transmission device includes:

[0035] The motor is fixedly arranged on the top of the pressure seat;

[0036] The gear is rotatably arranged inside the pressure seat, and the output shaft of the motor extends into the pressure seat and is fixedly arranged in the center of the gear;

[0037] There are two racks, both of which are slidably arranged inside the pressure seat. The two racks are located on both sides of the gear and are meshed with the gear. The ends of the two racks that are far away from each other are fixedly connected to the two sliders respectively.

[0038] As a further technical solution, two L-shaped plates are fixed on the frame, and the two L-shaped plates are symmetrically arranged on both sides of the conveyor belt assembly. A positioning groove is formed between the L-shaped plate and the frame. When the slide rod is located in the second strip hole, the two clamping blocks extend into the two positioning grooves respectively as the pressure seat descends.

[0039] As a further technical solution, the bottom surface of the press seat is made of glass, and a UV curing lamp group is arranged inside the press seat, and the UV curing lamp group covers the top of the bottom surface of the press seat.

[0040] As a further technical solution, in step S1, the thickness of the PET base layer is 0.075 mm-0.1 mm.

[0041] In order to solve the above technical problems, the technical solution adopted by the second object of the present invention is:

[0042] A layered wave-absorbing, shielding and light-transmitting film comprises a PET base layer, a shielding layer, a dielectric layer, a wave-absorbing layer and a hardening layer which are fixedly connected in sequence from the inside to the outside. The shielding layer is a nano-conductive material, and the wave-absorbing layer is a ferrite wave-absorbing nano-material.

[0043] The beneficial effects of the present invention are:

[0044] The present invention has a simple structure. The shielding layer and the absorbing layer are superimposed to form a layered absorbing, shielding and light-transmitting film. Compared with the combination of separate shielding and absorbing structural layers, the weight and thickness are significantly reduced. The film has a high light transmittance while taking into account both absorbing and shielding. It can effectively deal with electromagnetic interference and protection inside and outside electronic equipment, and improve the safety of products in complex electromagnetic environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0046] Figure 1 It is a schematic diagram of the three-dimensional structure of the imprinting device of the present invention in a state where the clamping block is released;

[0047] Figure 2 It is a cross-sectional structural schematic diagram of the clamping block of the imprinting device of the present invention in a loosened state;

[0048] Figure 3 It is a schematic diagram of the three-dimensional structure inside the pressing seat when the clamping block of the imprinting device of the present invention is in a loose state;

[0049] Figure 4 It is a schematic cross-sectional structure diagram of the interior of the press seat when the clamping block of the imprinting device of the present invention is in a loose state;

[0050] Figure 5 It is a three-dimensional structural schematic diagram of the clamping block of the imprinting device of the present invention in a clamping state;

[0051] Figure 6 It is a schematic cross-sectional structural diagram of a clamping block of the imprinting device of the present invention in a clamping state;

[0052] Figure 7 It is a structural schematic diagram of the imprinting state of the imprinting device of the present invention;

[0053] Figure 8 It is a schematic diagram of the cross-sectional structure of the layered wave-absorbing, shielding and light-transmitting film.

[0054] Description of Reference Numerals

[0055] 1. PET base layer; 2. Shielding layer; 3. Dielectric layer; 4. Absorbing layer; 5. Hardening layer; 6. Imprinting device; 61. Frame; 611. First frame; 612. Second frame; 613. Connecting cross bar; 62. Conveyor belt assembly; 63. Press seat; 64. Mounting groove; 65. Clamping assembly; 651. Clamping block; 652. First sliding hole; 653. Sliding rod; 654. Sliding block; 655. Second sliding hole; 66. Transmission device; 661. Motor; 662. Gear; 663. Rack; 67. Lifting assembly; 671. First connecting plate; 672. Second connecting plate; 673. Guide column; 674. Cylinder; 675. Adjusting screw; 68. L-shaped plate; 69. Positioning groove; 7. Template; 8. UV curing lamp group; 9. Button. DETAILED DESCRIPTION

[0056] The technical scheme in the embodiment of the present invention is described clearly and completely below in conjunction with the accompanying drawings in the embodiment of the present invention. In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0057] like Figure 1-Figure 7 As shown, the present invention proposes a method for preparing a layered wave-absorbing, shielding and light-transmitting film, comprising the following steps:

[0058] S1. Cut the PET base layer 1 into corresponding sizes according to actual needs, wherein the PET base layer 1 is a high-light-transmittance PET film with a thickness controlled at 0.075mm-0.1mm. This thickness range can ensure a certain mechanical strength of the film without having too much impact on its light transmittance and other properties.

[0059] S2, preparing a shielding layer 2 on one side of the PET base layer 1 by nanoimprinting technology. Specifically, step S2 includes:

[0060] S21, evenly apply primer on one surface of the PET base layer 1 to provide a good adhesion foundation for subsequent nano-groove imprinting and nano-conductive ink filling;

[0061] S22, using the imprinting device 6, imprinting nano grooves on the primer through the template 7, the pattern of the nano grooves is a random periodic grid pattern. In the specific operation, the template 7 is installed at the bottom of the press seat 63 and clamped by the clamping assembly 65, the imprinting device 6 is started, the press seat 63 is lowered, and the template 7 is in contact with the PET base layer 1 coated with the primer, and the nano grooves are imprinted, wherein the line diameter of the nano grooves is less than 5μm, specifically 4-5μm, and the height-width-depth ratio of the nano grooves is about 3:1;

[0062] S23, UV curing the nano-groove primer after embossing, and irradiating the primer with ultraviolet light emitted by the UV curing lamp group 8 to quickly cure the primer and enhance the stability of the nano-groove;

[0063] S24, filling the nano-grooves with nano-conductive ink, the nano-conductive ink can form a conductive network after filling, thereby achieving a shielding function, wherein the filled nano-conductive ink makes the surface resistance of the shielding layer 2 less than 1 ohm;

[0064] S25, performing UV curing again to cure the filled nano-conductive ink to ensure stable performance of the shielding layer 2;

[0065] S3. Prepare a dielectric layer 3 on the side of the shielding layer 2 away from the PET base layer 1. The dielectric layer 3 is an insulating transparent material, specifically glass or a plastic film. The preparation method of the dielectric layer 3 can adopt the existing process, which will not be described here. The setting of the dielectric layer 3 facilitates the film to be compatible with both shielding and wave absorbing functions.

[0066] S4, preparing an absorbing layer 4 on a side of the dielectric layer 3 away from the shielding layer 2. Specifically, step S4 includes:

[0067] S41, applying a primer on one side of the dielectric layer 3, which has the same function as the primer applied in the preparation of the shielding layer 2, in preparation for the subsequent embossing of the honeycomb grooves and the filling of the ferrite absorbing nano-slurry;

[0068] S42. Use the stamping device 6 to stamp a honeycomb groove on the base glue through the template 7. The specific pattern of the honeycomb groove is a honeycomb hexagon, wherein the line diameter of the honeycomb groove is 4-5μm, the aspect ratio of the honeycomb groove is about 3:1, and the transmittance is greater than 90%; in the stamping production of the absorbing layer 4, it is necessary to replace the template 7 used in the stamping production of the shielding layer 2 with a template 7 with a honeycomb hexagonal pattern.

[0069] S43, UV curing the honeycomb groove primer after embossing, the curing process is the same as the UV curing of the primer of the shielding layer 2, ensuring that the primer is completely cured, providing a stable foundation for the filling of the ferrite absorbing nano slurry;

[0070] S44, filling the honeycomb groove with ferrite absorbing nano slurry, using tools to scrape and compact it to ensure that the slurry is tightly filled. The absorbing layer 4 uses nano-ferrite absorbing material as an electromagnetic wave absorber, which has excellent absorption performance and a wide frequency range;

[0071] S45 , performing secondary UV curing on the honeycomb grooves filled with the ferrite absorbing nano-slurry to completely cure the slurry and form a stable absorbing layer 4 .

[0072] Among them, the imprinting device 6 in step S22 and step S42 includes a frame 61, a conveyor belt assembly 62 and a pressure seat 63. The frame 61 specifically includes a first frame body 611, a second frame body 612 and a connecting cross bar 613 fixedly arranged on the top of the second frame body 612. The conveyor belt assembly 62 is transmission-arranged on the first frame body 611, and is used to convey the PET base layer 1 or the medium layer 3 with the shielding layer 2 and the PET base layer 1 in sequence below. The conveyor belt assembly 62 adopts a vacuum adsorption conveyor belt, which can effectively transport and position the PET base layer 1 or the medium layer 3 with the shielding layer 2 and the PET base layer 1 in sequence below to avoid displacement during transportation. The conveyor belt assembly 62 is a prior art and is not described here in detail; the pressure seat 63 is lifted and lowered on the second frame body 612 and the connecting cross bar 613, and is located above the conveyor belt assembly 62. A mounting groove 64 with two ends connected to the outside is opened on the bottom surface of the pressure seat 63, and the template 7 is disassembled and arranged in the mounting groove 64 through the clamping assembly 65. The installation groove 64 is used to place the template 7 and is conducive to limiting the width direction of the template 7. Each template 7 in this embodiment includes a stamping area and clamping ends fixedly arranged at both ends of the stamping area, the clamping ends are used to cooperate with the clamping block 651, and various patterns are arranged on the bottom surface of the stamping area for stamping.

[0073] The clamping assembly 65 includes a clamping block 651, a first sliding hole 652, a sliding rod 653 and a sliding block 654. There are two clamping blocks 651, which are symmetrically arranged at the two ends of the bottom of the pressure seat 63. Both ends of each clamping block 651 are vertically fixed with a connecting plate. A gap for clamping the template 7 is provided between the clamping block 651 and the bottom surface of the mounting groove 64, and a rubber pad is provided on the side of the clamping block 651 close to the mounting groove 64 to avoid damage to the clamping end of the template 7 after clamping the template 7. There are four first sliding holes 652, which are respectively opened at the two ends of the two side walls of the pressure seat 63. The first sliding holes 652 include a first strip hole, an inclined hole and a second strip hole arranged in sequence from the end of the pressure seat 63 to the middle thereof. The length directions of the first strip hole and the second strip hole are both arranged in the transverse direction. The lower end of the inclined hole is connected to the first strip hole, and the high end of the inclined hole is connected to the second strip hole. There are two sliding rods 653, both of which are penetrated inside the pressure seat 63. The two ends of each sliding rod 653 are respectively slidably set in the corresponding first sliding hole 652, and extend from the first sliding hole 652 to be fixedly connected with the connecting plates at the two ends of the two clamping blocks 651. There are two sliding blocks 654, which are respectively set at the two ends inside the pressure seat 63. They can slide along the length direction of the second sliding hole 655 under the drive of the transmission device 66 (described in detail below). The middle part of the sliding block 654 is penetrated by a second sliding hole 655. The second sliding hole 655 is strip-shaped, and the length direction is set along the vertical direction. The two sliding rods 653 are respectively slidably set in the two second sliding holes 655.

[0074] The two sliders 654 are synchronously slidably arranged inside the press seat 63 through a transmission device 66. The transmission device 66 includes a motor 661, a gear 662 and a rack 663. The motor 661 is fixedly arranged at the top of the press seat 63. The gear 662 is rotatably arranged inside the press seat 63. The output shaft of the motor 661 extends into the press seat 63 and is fixedly penetrated in the center of the gear 662. There are two racks 663, both of which are slidably arranged inside the press seat 63. The two racks 663 are located on both sides of the gear 662 and are meshed with the gear 662. The ends of the two racks 663 that are away from each other are respectively fixedly connected to the two sliders 654. The motor 661 in this embodiment is a motor 661 with a brake device. It can only drive the output shaft to rotate in the working state. In the non-working state, its output shaft will not rotate under the action of external force. Therefore, the shutdown of the motor 661 can produce a locking effect on the rotation of the gear 662 and the rack 663, so as to achieve the clamping of the clamping block 651 on the template 7. The motor 661 in this embodiment can also be replaced with a manual adjustment device with a locking function, such as a rotating handle with a positioning pin. This is a replacement of the prior art and will not be described in detail here.

[0075] The pressure seat 63 is lifted and arranged on the second frame 612 and the connecting cross bar 613 by the lifting assembly 67. Specifically, the lifting assembly 67 includes a first connecting plate 671, a second connecting plate 672, a guide column 673 and a cylinder 674. The first connecting plate 671 is fixedly connected to the pressure seat 63 through the connecting column. A plurality of adjusting screws 675 are arranged on the top of the first connecting plate 671. A threaded hole is provided on the second connecting plate 672. The bottom of the adjusting screw 675 passes through the threaded hole and is rotatably connected to the top surface of the first connecting plate 671. The bottom of the guide column 673 is fixedly connected to the top of the second connecting plate 672. A guide hole is provided in the middle of the connecting cross bar 613 in a vertical direction. The guide column 673 is slidably penetrated in the guide hole in the vertical direction, which is conducive to limiting the lifting and sliding trajectory of the guide column 673 and also ensures the stability of sliding. The cylinder 674 is fixedly arranged on the connecting cross bar 613 through a fixed frame, and the piston rod of the cylinder 674 is fixedly connected to the top of the guide column 673. The second connecting plate 672 is connected to the first connecting plate 671 via an adjusting screw 675, and the distance between the second connecting plate 672 and the first connecting plate 671 can be adjusted as required, thereby adjusting the distance between the pressing seat 63 and the conveyor belt assembly 62. When adjusting, it is only necessary to rotate the adjusting screw 675 to rotate and drive the first connecting plate 671 to move closer to or away from the second connecting plate 672, which is convenient to operate.

[0076] Two L-shaped plates 68 are fixedly arranged on the side wall of the first frame 611. The two L-shaped plates 68 are symmetrically arranged on both sides of the conveyor belt assembly 62. A positioning groove 69 is formed between the L-shaped plates 68 and the first frame 611. When the slide bar 653 is located in the second strip hole, the two clamping blocks 651 are close to each other. After that, the pressure seat 63 descends and drives the two clamping blocks 651 to descend, and then respectively extend into the two positioning grooves 69. The arrangement of the clamping blocks 651 can not only replace the template 7 and clamp the template 7 in cooperation with the first slide hole 652, the slide bar 653 and the slider 654, but also limit the movement trajectory of the descent of the pressure seat 63 by cooperating with the positioning groove 69, so as to avoid the displacement of the pressure seat 63 and affect the stamping effect, thereby ensuring the accuracy of stamping, and being practical and reliable.

[0077] The bottom surface of the pressing seat 63 is made of glass, that is, the bottom surface of the mounting groove 64 is made of transparent glass. A UV curing lamp group 8 is arranged inside the pressing seat 63. The UV curing lamp group 8 covers the top of the bottom surface of the mounting groove 64. After the template 7 is installed in the mounting groove 64, the top of its imprinting area is covered with the UV curing lamp group 8, which is conducive to UV curing after imprinting and ensures the curing effect. A button 9 for controlling the opening and closing of the UV curing lamp group 8 is provided at the bottom of the positioning groove 69. When the pressure seat 63 descends so that the template 7 at the bottom is completely pressed on the PET base layer 1 or the medium layer 3 with the shielding layer 2 and the PET base layer 1 in sequence below, the clamp 651 extends into the positioning groove 69, and the bottom of the clamp 651 presses the button 9 to turn on the UV curing lamp group 8. When the clamp 651 is withdrawn from the positioning groove 69, the button 9 is gradually released and the UV curing lamp group 8 is turned off. Therefore, after the template 7 is imprinted, the UV curing lamp group 8 is automatically turned on for UV curing through the cooperation of the clamp 651 and the button 9, and the UV curing lamp group 8 is turned off when the template 7 is separated from the imprinted base glue. The design is simple and ingenious.

[0078] The working process of the stamping device 6 is as follows:

[0079] Before the stamping work, the motor 661 rotates, driving the gear 662 to rotate, and the gear 662 drives the two racks 663 to slide in the opposite direction. The two racks 663 drive the two sliders 654 to slide toward the two ends of the press seat 63 respectively. The slider 654 cooperates with the slide bar 653 through the second slide hole 655, driving the slide bar 653 to slide in the first slide hole 652, so that the slide bar 653 passes through the second strip hole and the inclined hole in turn, and finally slides to the end of the first strip hole, so that the clamping block 651 moves downward while moving toward the two ends of the press seat 63, so that the gap between the clamping block 651 and the bottom of the installation groove 64 becomes larger, and then the corresponding template 7 is installed to the press seat 63. In the installation groove 64 at the bottom of the seat 63, the motor 661 reverses at this time, driving the gear 662 to rotate in the opposite direction, the gear 662 drives the two racks 663 to slide towards each other, and the two racks 663 drive the two sliders 654 to slide toward the middle of the pressure seat 63 respectively. The slider 654 cooperates with the slide rod 653 through the second slide hole 655, driving the slide rod 653 to slide in the first slide hole 652, so that the slide rod 653 passes through the first strip hole and the inclined hole in turn, and finally slides to the end of the second strip hole, so that the clamping block 651 moves upward while moving toward the middle of the pressure seat 63, thereby clamping the two clamping ends of the template 7 to complete the installation of the template 7.

[0080] During the stamping process, the conveyor belt assembly 62 transports the PET base layer 1 coated with the primer or the dielectric layer 3 with the shielding layer 2 and the PET base layer 1 below to the bottom of the press seat 63 and stops transporting. Then the cylinder 674 is started, and the piston rod of the cylinder 674 extends to push the guide column 673 to slide down in the guide hole. The guide column 673 drives the second connecting plate 672 and the first connecting plate 671 as well as the press seat 63 fixed thereunder to descend, so that the template 7 at the bottom of the press seat 63 is pressed on the PET base layer 1 or the dielectric layer 3 with the shielding layer 2 and the PET base layer 1 below, and the primer is stamped on the PET base layer 1 or the dielectric layer 3 with the shielding layer 2 and the PET base layer 1 below. At the same time, the two clamps 651 extend into the two positioning grooves 69 respectively as the press seat 63 descends, and after the press seat 63 descends to its position, the button 9 at the bottom of the positioning groove 69 is pressed to turn on the UV curing lamp group 8 inside the press seat 63, so that the base glue is UV cured after embossing. After the curing is completed, the cylinder 674 drives the guide column 673, the second connecting plate 672, the first connecting plate 671 and the press seat 63 to rise, driving the template 7 to separate from the PET base layer 1 or the medium layer 3 with the shielding layer 2 and the PET base layer 1 below, and the clamps 651 are gradually separated from the button 9, so that the button 9 is reset and the UV curing lamp group 8 is turned off. Then the conveyor belt assembly 62 continues to convey and proceeds to the next process.

[0081] The stamping device 6 of the present invention can be used for stamping the shielding layer 2 and the absorbing layer 4 by replacing the template 7. The steps of replacing the template 7 are the same as the steps of installing the template 7 before the stamping work, and will not be repeated here.

[0082] S5. A nano-transparent hardened layer 5 is prepared by scraping on the side of the absorbing layer 4 away from the dielectric layer 3. The hardened layer 5 is an anti-oxidation coating. The surface hardness of the film layer is greater than 6H, and it is scratch-resistant and abrasion-resistant, which is beneficial to enhancing the environmental adaptability of the product.

[0083] like Figure 8 As shown, the present invention also proposes a layered absorbing shielding light-transmitting film, comprising a PET base layer 1, a shielding layer 2, a dielectric layer 3, an absorbing layer 4 and a hardening layer 5 fixedly connected in sequence from the inside to the outside, the thickness of the PET base layer 1 is 0.075mm-0.1mm, the shielding layer 2 is a grid-shaped nano-conductive material formed by nanoimprinting technology, wherein the wire width of the grid is controlled at 4-5μm, the dielectric layer 3 is an insulating transparent material, specifically glass or plastic film, the absorbing layer 4 is a honeycomb ferrite absorbing nano-material formed by nanoimprinting technology, the absorbing layer 4 uses nano-level ferrite absorbing material as an electromagnetic wave absorber, and has excellent absorption performance and a wide frequency range; the hardening layer 5 is an anti-oxidation coating, the surface hardness of the film layer is greater than 6H, and it is scratch-resistant and abrasion-resistant, which is beneficial to enhancing the environmental adaptability of the product.

[0084] The layered wave-absorbing shielding light-transmitting film of the present invention achieves a good combination of wave-absorbing shielding performance and light transmittance through a unique layered structure design and material selection. The PET base layer 1 provides basic light transmittance and mechanical properties, the shielding layer 2 and the wave-absorbing layer 4 respectively use nano-conductive materials and ferrite wave-absorbing nano-materials to effectively shield and absorb electromagnetic radiation, the dielectric layer 3 can not only separate the shielding layer 2 and the wave-absorbing layer 4, so that the film can be compatible with the shielding and wave-absorbing functions, but also can adjust the overall optical properties of the film to a certain extent, such as reducing screen glare, enhancing contrast, etc. The hardening layer 5 improves the surface hardness and wear resistance of the film, so that the overall light transmittance of the layered wave-absorbing shielding light-transmitting film is greater than 80%, and the shielding efficiency reaches about 60 decibels, which can be used in light-transmitting shielding and wave-absorbing stealth occasions in military and civilian optical transparent parts such as displays, confidentiality facilities and medical diagnosis of aerospace equipment, weapon equipment terminals, etc.

[0085] The above description is only a preferred embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. A method for preparing a layered wave-absorbing, shielding and light-transmitting film, characterized in that: The following steps are involved: S1, cutting the PET base layer into corresponding sizes; S2, preparing a shielding layer on one side of the PET base layer, step S2 comprises: S21, applying primer on one side of the PET base layer; S22, printing nano-grooves on the primer by using a template; S23, UV curing the printed nano-groove primer; S24, filling nano-conductive ink into the nano-grooves; S25, UV curing again; S3, preparing a dielectric layer on the side of the shielding layer away from the PET base layer; S4, preparing an absorbing layer on a side of the dielectric layer away from the shielding layer, step S4 comprises: S41, applying primer on one side of the dielectric layer; S42, embossing a honeycomb groove on the base glue by using a template; S43, UV curing the printed honeycomb groove primer; S44, filling the honeycomb groove with ferrite wave-absorbing nano-slurry; S45, UV curing is performed again; S5, preparing a hardening layer on a side of the absorbing layer away from the dielectric layer; Step S22 and step S42 both prepare nano-grooves and honeycomb-shaped grooves by using an imprinting device, and the imprinting device includes: frame; A conveyor belt assembly, which is arranged on the frame and is used to convey the PET base layer or the medium layer with the shielding layer and the PET base layer in sequence below; The press seat is lifted and set on the frame and is located above the conveyor belt assembly. The template is disassembled and set at the bottom of the press seat through the clamping assembly. The clamping assembly includes: Clamping blocks, there are two clamping blocks, which are symmetrically arranged at the two ends of the bottom of the press seat, and connecting plates are vertically fixed at both ends of each clamping block, and a gap for clamping the template is set between the clamping block and the bottom surface of the press seat; First sliding holes, there are four first sliding holes, which are respectively opened at both ends of the two side walls of the pressure seat, and the first sliding holes include a first strip hole, an inclined hole, and a second strip hole which are arranged in sequence from the end to the middle of the pressure seat, and the length directions of the first strip hole and the second strip hole are both arranged in the horizontal direction, the lower end of the inclined hole is connected to the first strip hole, and the high end of the inclined hole is connected to the second strip hole; Slide rods, there are two slide rods, both of which are inserted into the pressure seat, and the two ends of each slide rod are respectively slidably set in the corresponding first slide hole, and extend from the first slide hole to be fixedly connected with the connecting plates at the two ends of the two clamping blocks; There are two sliders, which are respectively arranged at the two ends inside the pressure seat and are both slidably arranged along the length direction of the first strip hole. A second sliding hole is opened through the middle of the slider. The second sliding hole is strip-shaped and the length direction is arranged along the vertical direction. The two sliding rods are respectively slidably arranged in the two second sliding holes.

2. The method for preparing a layered wave-absorbing, shielding and light-transmitting film according to claim 1, characterized in that: The two sliders are synchronously slidably arranged inside the press seat through a transmission device, and the transmission device includes: The motor is fixedly arranged on the top of the pressure seat; The gear is rotatably arranged inside the pressure seat, and the output shaft of the motor extends into the pressure seat and is fixedly arranged in the center of the gear; There are two racks, both of which are slidably arranged inside the pressure seat. The two racks are located on both sides of the gear and are meshed with the gear. The ends of the two racks that are far away from each other are fixedly connected to the two sliders respectively.

3. The method for preparing a layered wave-absorbing, shielding and light-transmitting film according to claim 1, characterized in that: Two L-shaped plates are fixedly arranged on the frame, and the two L-shaped plates are symmetrically arranged on both sides of the conveyor belt assembly. A positioning groove is formed between the L-shaped plates and the frame. When the slide bar is located in the second strip hole, the two clamping blocks extend into the two positioning grooves respectively as the pressure seat descends.

4. The method for preparing a layered wave-absorbing, shielding and light-transmitting film according to claim 1, characterized in that: The bottom surface of the press seat is made of glass, and a UV curing lamp group is arranged inside the press seat, and the UV curing lamp group covers the top of the bottom surface of the press seat.

5. The method for preparing a layered wave-absorbing, shielding and light-transmitting film according to claim 1, characterized in that: In step S1, the thickness of the PET base layer is 0.075 mm-0.1 mm.

6. A layered wave-absorbing, shielding and light-transmitting film, characterized in that: The method for preparing a layered absorbing, shielding and light-transmitting film according to any one of claims 1 to 5 comprises a PET base layer, a shielding layer, a dielectric layer, an absorbing layer and a hardening layer which are fixedly connected in sequence from the inside to the outside, the shielding layer is a nano-conductive material, and the absorbing layer is a ferrite absorbing nano-material.

Images