CN114179449A - Wave-absorbing material for folding screen and preparation method and application thereof - Google Patents

Wave-absorbing material for folding screen and preparation method and application thereof Download PDF

Info

Publication number
CN114179449A
CN114179449A CN202111410910.3A CN202111410910A CN114179449A CN 114179449 A CN114179449 A CN 114179449A CN 202111410910 A CN202111410910 A CN 202111410910A CN 114179449 A CN114179449 A CN 114179449A
Authority
CN
China
Prior art keywords
wave
absorbing material
layer
absorbing
mass
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111410910.3A
Other languages
Chinese (zh)
Inventor
饶钦盛
罗毅
曾思兴
斯海文
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangzhou Golden South Magnetic Material Co ltd
Original Assignee
Guangzhou Golden South Magnetic Material Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangzhou Golden South Magnetic Material Co ltd filed Critical Guangzhou Golden South Magnetic Material Co ltd
Priority to CN202111410910.3A priority Critical patent/CN114179449A/en
Publication of CN114179449A publication Critical patent/CN114179449A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/025—Electric or magnetic properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/085—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/088—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/09—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/095—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyurethanes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/18—Layered products comprising a layer of metal comprising iron or steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B32B27/283—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polysiloxanes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/026—Details of the structure or mounting of specific components
    • H04M1/0266—Details of the structure or mounting of specific components for a display module assembly
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0073—Shielding materials
    • H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
    • H05K9/0084—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising a single continuous metallic layer on an electrically insulating supporting structure, e.g. metal foil, film, plating coating, electro-deposition, vapour-deposition
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0073—Shielding materials
    • H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
    • H05K9/0088—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising a plurality of shielding layers; combining different shielding material structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/202—Conductive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/206—Insulating

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Signal Processing (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

The invention discloses a wave-absorbing material for a folding screen and a preparation method and application thereof. The wave-absorbing material for the folding screen is of a laminated structure and comprises a bottom layer, a middle layer and a top layer; the bottom layer is a first insulating layer; the middle layer is a wave absorbing layer; the top layer includes a second insulating layer, or a conductive layer, or a stacked second insulating layer and conductive layer. The wave-absorbing material for the folding screen has excellent magnetic conductivity, reflection loss and excellent folding performance; the wave-absorbing material has the advantages of simple preparation method, low cost and wide raw material source, and can be produced in an industrial scale; the wave-absorbing material provided by the invention can be applied to the field of foldable screens.

Description

Wave-absorbing material for folding screen and preparation method and application thereof
Technical Field
The invention belongs to the field of materials, and particularly relates to a wave-absorbing material for a folding screen, and a preparation method and application thereof.
Background
In the past two decades, consumer electronics are developed vigorously, various innovations emerge endlessly, and products are iterated continuously from notebook computers to mobile phones to the Internet of things, so that our lives are influenced deeply. Consumer products with flexible and bendable screens, such as mobile phones, notebook computers, and even LV bags, are gradually entering people's lives. The flexible foldable consumer electronic products are becoming a popular trend, and the market will have more and more flexible foldable electronic products, which will be more and more popular in the coming years and more appear in our daily production and living scenes.
Some flexible screen manufacturers adopt an external bending technical route, some flexible screen manufacturers adopt an internal bending technical route, and no matter which technical route, the Electromagnetic Interference problem may exist, and Electromagnetic Interference (EMI) resistant materials capable of being repeatedly folded are needed to solve the problem of Electromagnetic Compatibility (EMC). In addition, it is expected that as the operating frequency of electronic products increases, the compatible communication frequency band becomes wider and wider, and the EMC problem becomes more complicated. The wave-absorbing material is an effective means for solving the problems, and the foldable product necessarily puts new requirements on the wave-absorbing material. The wave-absorbing material which can be repeatedly folded, does not crack and does not break has outstanding significance and value for solving the problem of electromagnetic interference of flexible foldable electronic products, and has wide market prospect in the future. The existing wave-absorbing materials have the problem that the materials cannot be folded repeatedly, and the materials can crack or break after being folded repeatedly. In order to meet the requirements of such electronic products, a wave-absorbing material capable of being repeatedly folded for 1 ten thousand to 10 ten thousand times needs to be developed.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention provides a wave-absorbing material for a folding screen; the second purpose of the invention is to provide a preparation method of the wave-absorbing material; the invention also aims to provide application of the wave-absorbing material.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention provides a wave-absorbing material for a folding screen, which is of a laminated structure and comprises a bottom layer, a middle layer and a top layer; the bottom layer is a first insulating layer; the middle layer is a wave absorbing layer; the top layer includes a second insulating layer, or a conductive layer, or a stacked second insulating layer and conductive layer.
Preferably, the top layer includes a second insulating layer and a conductive layer which are stacked, and the second insulating layer is connected with the wave-absorbing layer.
Preferably, the first insulating layer comprises at least one of polyolefin, polyester and polyamide; further preferably, the first insulating layer includes at least one of polyethylene terephthalate (PET), Polyimide (PI), Polyethylene (PE), and polypropylene (PP); still more preferably, the first insulating layer includes at least one of PET, PI, and PE.
Preferably, the second insulating layer comprises at least one of polyolefin, polyester and polyamide; further preferably, the second insulating layer includes at least one of polyethylene terephthalate (PET), Polyimide (PI), Polyethylene (PE), and polypropylene (PP); still further preferably, the second insulating layer includes at least one of PET, PI, and PE.
Preferably, the conductive layer includes at least one of copper foil, aluminum foil mylar, copper foil mylar, and conductive cloth.
Preferably, the wave-absorbing material meets at least one of the following conditions:
the thickness of the wave-absorbing layer is 20-1000 μm;
the thickness of the first insulating layer is 1-1000 μm;
the thickness of the second insulating layer is 1-1000 μm;
the thickness of the conductive layer is 1-1000 μm;
the thickness of the wave-absorbing material is 20-3000 μm.
Further preferably, the thickness of the wave-absorbing layer is 20-1000 μm; still further preferably, the thickness of the wave-absorbing layer is 20-500 μm; still more preferably, the thickness of the wave-absorbing layer is 40 μm-500 μm.
Further preferably, the thickness of the first insulating layer is 1 μm to 1000 μm; still more preferably, the thickness of the first insulating layer is 3 μm to 500 μm; still more preferably, the first insulating layer has a thickness of 5 μm to 150 μm.
Further preferably, the thickness of the second insulating layer is 1 μm to 1000 μm; still further preferably, the thickness of the second insulating layer is 3 μm to 500 μm; still further preferably, the thickness of the second insulating layer is 5 μm to 150 μm.
Further preferably, the thickness of the conductive layer is 1 μm to 1000 μm; still more preferably, the thickness of the conductive layer is 3 μm to 500 μm; still more preferably, the thickness of the conductive layer is 5 μm to 150 μm.
Further preferably, the thickness of the wave-absorbing material is 20-3000 μm; still further preferably, the thickness of the wave-absorbing material is 25-1000 μm; more preferably, the thickness of the wave-absorbing material is 25-500 μm.
Preferably, the wave-absorbing layer comprises the following components: absorbent, adhesive and auxiliary materials;
the auxiliary materials comprise at least one of a plasticizer, a promoter, an activator, an anti-aging agent and a vulcanizing agent.
Preferably, the absorbent comprises at least one of a carbon-based wave-absorbing material, an iron-based wave-absorbing material, a ceramic-based wave-absorbing material, an alloy-based wave-absorbing material, a conductive polymer wave-absorbing material, a chiral wave-absorbing material and a plasma wave-absorbing material; further preferably, the absorbent includes at least one of graphene, graphite, carbon black, carbon fiber, carbon nanotube, ferrite, magnetic iron nanomaterial, carbonyl iron powder, silicon carbide, sendust, iron nickel, and iron nickel molybdenum; still further preferably, the absorbent comprises at least one of sendust and carbonyl iron powder.
Preferably, the adhesive comprises at least one of elastomer, resin and rubber; further preferably, the adhesive comprises at least one of polyurethane, acrylic resin, nitrile rubber, polyvinyl acetate, acrylic resin, polyvinyl alcohol resin, epoxy resin, silicone rubber and fluororubber; still more preferably, the adhesive includes at least one of nitrile rubber (NBR rubber) and polyurethane.
Preferably, the absorbent in the wave-absorbing layer: adhesive agent: the mass ratio of the auxiliary materials is (8-30): (0.5-7): 1; further preferably, the absorbent in the wave-absorbing layer: adhesive agent: the mass ratio of the auxiliary materials is (10-25): (0.8-5): 1; further, preferably, the absorbent in the wave-absorbing layer: adhesive agent: the mass ratio of the auxiliary materials is (12-20): (1-4): 1.
preferably, the plasticizer comprises at least one of fatty acid esters, polyol esters, epoxy hydrocarbons and alkyl sulfonate; further preferably, the plasticizer is cyclohexane 1, 2-dicarboxylic acid diisononyl ester.
Preferably, the accelerator comprises at least one of thiazoles, guanidines, sulfenamides, imides, and aldamines; further preferably, the accelerator is a thiazole accelerator; still further preferably, the accelerator is N- (oxydiethylene) -2-benzothiazolesulfenamide.
Preferably, the activating agent is at least one of stearate and stearic acid; further preferably, the activator includes at least one of zinc stearate and calcium stearate.
Preferably, the anti-aging agent is an antioxidant; more preferably, the antioxidant is at least one of antioxidant 1010, antioxidant 618 and antioxidant 168.
Preferably, the vulcanizing agent is peroxide vulcanizing agent (DCP).
Preferably, the auxiliary materials comprise a plasticizer: accelerator (b): activating agent: an anti-aging agent: the mass ratio of the vulcanizing agent is 1: (0.15-0.7): (0.25-1): (0.25-1): (0.15-0.7).
Preferably, the relative magnetic permeability of the wave-absorbing material at 3MHz is 5-300; further preferably, the relative magnetic permeability of the wave-absorbing material at 3MHz is 50-280; still more preferably, the relative magnetic permeability of the wave-absorbing material at 3MHz is 150-250.
Preferably, the reflection loss peak value of the wave-absorbing material is-40 dB-55 dB; further preferably, the reflection loss peak value of the wave-absorbing material is-35 dB-45 dB.
Preferably, the wave-absorbing material has the folding performance of 8000-; further preferably, the wave-absorbing material has the folding performance of 10000-; still further preferably, the wave-absorbing material has a folding performance of 10000-100000 times.
Preferably, the wave-absorbing material is a sheet or a coiled material.
The second aspect of the invention provides a method for preparing the wave-absorbing material for the folding screen according to the first aspect of the invention, which comprises the following steps:
1) mixing an absorbent, an adhesive and auxiliary materials, and molding to obtain the intermediate layer;
2) and superposing the middle layer with the top layer and the bottom layer, and molding to obtain the wave-absorbing material.
Preferably, in the step 1), the molding method includes thermal compression, film lamination or adhesion.
Preferably, in the step 2), the forming method includes coating or calendering.
In a third aspect, the invention provides a use of the wave-absorbing material for a folding screen according to the first aspect of the invention in the field of foldable screens.
The invention has the beneficial effects that:
the wave-absorbing material for the folding screen has excellent magnetic conductivity, reflection loss and excellent folding performance; the wave-absorbing material has the advantages of simple preparation method, low cost and wide raw material source, and can be produced in an industrial scale; the wave-absorbing material provided by the invention can be applied to the field of foldable screens.
Specifically, the invention has the following advantages:
1. the wave-absorbing material provided by the invention has excellent magnetic conductivity or reflection loss, and the tested relative magnetic conductivity is 150-300 or the reflection loss is-35-45 dB; the wave-absorbing material can be repeatedly folded for 10000 times and 100000 times without breaking according to different thickness requirements; the wave-absorbing material mainly comprises a three-layer structure or a four-layer structure, and when the two outer surfaces are polymer layers, the wave-absorbing material has the characteristics of complete insulation and double-sided wave absorption, and can meet the product requirements with high insulation requirements; when the outer surface is provided with a metal layer, the wave-absorbing material has the characteristics of single-side conduction and single-side wave absorption, and can meet the requirements of single-side insulation and single-side conduction products; when the two outer surfaces are polymer layers and the interior is provided with a metal layer, the wave-absorbing material can realize the conduction of the non-conductive end faces of the two surfaces, protect the wave-absorbing material from being oxidized, has the characteristic of single-surface wave absorption, can be applied to the requirements of carrying out anti-oxidation protection and folding on the wave-absorbing material, and has a higher application scene compared with a three-layer structure.
2. The wave-absorbing material provided by the invention has the advantages of simple preparation method, low cost and wide raw material source, and can be used for industrial large-scale production, and all the used equipment is industrial equipment.
3. The wave-absorbing material provided by the invention can meet the requirement of anti-electromagnetic interference of folding electronic products, such as folding screen mobile phones or notebook computers, solves the problem of mutual interference between electronic components, and can improve the reading and writing precision and writing smoothness of the folding electromagnetic screen; the wave-absorbing material can be made into coiled materials or sheets, and can be punched into various specifications and shapes according to requirements to meet the attaching requirements of electronic products.
Drawings
Figure 1 is a schematic cross-sectional view of the wave-absorbing material of example 1.
Fig. 2 is a schematic structural diagram of the wave-absorbing material in embodiment 1.
Figure 3 is a schematic cross-sectional view of the wave-absorbing material of example 3.
Fig. 4 is a schematic structural diagram of the wave-absorbing material in embodiment 3.
Figure 5 is a schematic cross-sectional view of the wave-absorbing material of example 10.
Fig. 6 is a structural schematic diagram of the wave-absorbing material of embodiment 10.
Detailed Description
The following examples are presented to further illustrate the practice of the invention, but the practice and protection of the invention is not limited thereto. It is noted that the processes described below, if not specifically described in detail, are all realizable or understandable by those skilled in the art with reference to the prior art. The reagents or apparatus used are not indicated to the manufacturer, and are considered to be conventional products available through commercial purchase.
Example 1
The preparation method of the wave-absorbing material for the folding screen comprises the following steps:
1) adding 80 parts by mass of ferrum-silicon-aluminum absorbent, 15 parts by mass of polyurethane elastomer, 1 part by mass of cyclohexane 1, 2-diisononyl phthalate plasticizer, 0.5 part by mass of N- (oxydiethylene) -2-benzothiazole sulfonamide accelerator, 1 part by mass of zinc stearate activator, 0.5 part by mass of 1010 and 168 anti-aging agents and 2 parts by mass of vulcanizing agent DCP into cyclohexanone solvent, and uniformly mixing and stirring to obtain premixed slurry;
2) coating the slurry obtained in the step (1) on a 50-micron PET film in a coating mode, drying the PET film through a drying channel, and then stripping the PET film to obtain a dry film of the wave-absorbing layer;
3) covering two sides of the dry film obtained in the step 2 with a 5-micron PET film, and performing hot-press molding at 150 ℃ for 15min to obtain a coiled wave-absorbing material, wherein the thickness of the wave-absorbing layer is 20 microns, and the total thickness of the wave-absorbing material is 30 microns;
4) and (3) carrying out double-sided adhesive tape on the wave-absorbing material obtained in the step (3) through an adhesive tape backing machine to obtain a three-layer wave-absorbing material, and then carrying out die cutting to obtain the wave-absorbing material matched with the circuit board or the liquid crystal screen.
Fig. 1 is a schematic cross-sectional view of the wave-absorbing material of embodiment 1, and fig. 2 is a schematic structural view of the wave-absorbing material of embodiment 1, where 1 is an insulating layer, and 2 is a wave-absorbing layer.
Example 2
The preparation method of the wave-absorbing material for the folding screen comprises the following steps:
1) adding 85 parts by mass of ferrum-silicon-aluminum absorbent, 10 parts by mass of polyurethane elastomer, 1 part by mass of cyclohexane 1, 2-diisononyl phthalate plasticizer, 0.5 part by mass of N- (oxydiethylene) -2-benzothiazole sulfonamide accelerator, 1 part by mass of zinc stearate activator, 0.5 part by mass of 1010 and 168 anti-aging agents and 2 parts by mass of vulcanizing agent DCP into cyclohexanone solvent, and uniformly mixing and stirring to obtain premixed slurry;
2) coating the slurry obtained in the step (1) on a 50-micron PET film in a coating mode, drying the PET film through a drying channel, and then stripping the PET film to obtain a dry film of the wave-absorbing layer;
3) covering two sides of the dry film obtained in the step 2 with a 100-micron PET film for hot-press molding to obtain a coiled wave-absorbing material, wherein the thickness of the wave-absorbing layer is 500 microns, and the total thickness of the wave-absorbing material is 700 microns;
4) and (3) carrying out double-sided adhesive tape on the wave-absorbing material obtained in the step (3) through an adhesive tape backing machine to obtain the wave-absorbing material with a three-layer structure, and then carrying out die cutting to obtain the wave-absorbing material matched with the circuit board or the liquid crystal screen.
Example 3
The preparation method of the wave-absorbing material for the folding screen comprises the following steps:
1) adding 87 parts by mass of ferrum-silicon-aluminum absorbent, 8 parts by mass of polyurethane elastomer, 1 part by mass of cyclohexane 1, 2-diisononyl phthalate plasticizer, 0.5 part by mass of N- (oxydiethylene) -2-benzothiazole sulfonamide accelerator, 1 part by mass of zinc stearate activator, 0.5 part by mass of 1010 and 168 anti-aging agents and 2 parts by mass of vulcanizing agent DCP into cyclohexanone solvent, and uniformly mixing and stirring to obtain premixed slurry;
2) coating the slurry obtained in the step (1) on a 50-micron PET film in a coating mode, drying the PET film through a drying channel, and then stripping the PET film to obtain a dry film of the wave-absorbing layer;
3) coating 45-micrometer aluminum foil mylar on one surface of the dry film obtained in the step 2, wherein the aluminum foil mylar is in a structure of 30-micrometer aluminum foil + 15-micrometer mPE film, and coating 20-micrometer PET film on the other surface of the dry film for hot-press molding to obtain a coiled wave-absorbing material, wherein the thickness of the wave-absorbing layer is 50 micrometers, and the total thickness of the wave-absorbing material is 115 micrometers;
4) and (3) performing die cutting on the wave-absorbing material obtained in the step (3) through double-sided adhesive on the back of an adhesive backing machine and the wave-absorbing material with a four-layer structure to obtain the wave-absorbing material matched with the circuit board or the liquid crystal screen.
Fig. 3 is a schematic cross-sectional view of the wave-absorbing material of embodiment 3, and fig. 4 is a schematic structural view of the wave-absorbing material of embodiment 3.
Wherein 1 is an insulating layer, 2 is a wave-absorbing layer, and 3 is a conductive layer.
Example 4
The preparation method of the wave-absorbing material for the folding screen comprises the following steps:
1) putting 83 parts by mass of a ferrum-silicon-aluminum absorbent, 10 parts by mass of poly NBR rubber, 3 parts by mass of cyclohexane 1, 2-diisononyl phthalate plasticizer, 0.5 part by mass of N- (oxydiethylene) -2-benzothiazole sulfonamide accelerator, 1 part by mass of zinc stearate activator, 0.5 part by mass of 1010 and 168 anti-aging agents and 2 parts by mass of vulcanizing agent DCP into an internal mixer for mixing to obtain a uniform mixture;
2) rolling the mixture obtained in the step 1 into sheets to obtain coiled materials with the thickness of 0.1 mm;
3) covering two sides of the dry film obtained in the step 2 with a PET film of 30 microns for hot-press molding to obtain a coiled wave-absorbing material, wherein the total thickness of the wave-absorbing material is 160 microns;
4) and (3) carrying out double-sided adhesive tape on the back of the wave-absorbing material obtained in the step (3) to obtain a wave-absorbing material with a three-layer structure, and then carrying out die cutting to obtain the wave-absorbing material matched with the circuit board or the liquid crystal screen.
Example 5
The preparation method of the wave-absorbing material for the folding screen comprises the following steps:
1) adding 90 parts by mass of ferrum-silicon-aluminum absorbent, 8 parts by mass of polyurethane elastomer, 1 part by mass of cyclohexane 1, 2-diisononyl phthalate plasticizer, 0.5 part by mass of N- (oxydiethylene) -2-benzothiazole sulfonamide accelerator, 1 part by mass of zinc stearate activator, 0.5 part by mass of 1010 and 168 anti-aging agents and 2 parts by mass of vulcanizing agent DCP into cyclohexanone solvent, and uniformly mixing and stirring to obtain premixed slurry;
2) coating the slurry obtained in the step (1) on a 50-micron PET film in a coating mode, drying the PET film through a drying channel, and then stripping the PET film to obtain a dry film of the wave-absorbing layer;
3) covering PP films with the thickness of 30 mu m on two sides of the dry film obtained in the step 2, and performing hot press molding to obtain a coiled wave-absorbing material with the wave-absorbing layer thickness of 200 mu m, wherein the total thickness of the wave-absorbing material is 260 mu m;
4) and (3) carrying out double-sided adhesive tape on the back of the wave-absorbing material obtained in the step (3) to obtain a wave-absorbing material with a three-layer structure, and then carrying out die cutting to obtain the wave-absorbing material matched with the circuit board or the liquid crystal screen.
Example 6
The preparation method of the wave-absorbing material for the folding screen comprises the following steps:
1) adding 80 parts by mass of carbonyl iron powder absorbent, 15 parts by mass of polyurethane elastomer, 1 part by mass of cyclohexane 1, 2-diisononyl phthalate plasticizer, 0.5 part by mass of N- (oxydiethylene) -2-benzothiazole sulfonamide accelerator, 1 part by mass of zinc stearate activator, 0.5 part by mass of 1010 and 168 anti-aging agents and 2 parts by mass of vulcanizing agent DCP into cyclohexanone solvent, and uniformly mixing and stirring to obtain premixed slurry;
2) coating the slurry obtained in the step (1) on a 50-micron PET film in a coating mode, drying the PET film through a drying channel, and then stripping the PET film to obtain a dry film of the wave-absorbing layer;
3) covering the two sides of the dry film obtained in the step 2 with PE films of 20 microns, and performing hot press molding to obtain a coiled wave-absorbing material with the wave-absorbing layer thickness of 70 microns, wherein the total thickness of the wave-absorbing material is 110 microns;
4) and (3) carrying out double-sided adhesive tape on the back of the wave-absorbing material obtained in the step (3) to obtain the wave-absorbing material with a three-layer structure, and then carrying out die cutting to obtain the wave-absorbing material meeting the purposes of various modules.
Example 7
The preparation method of the wave-absorbing material for the folding screen comprises the following steps:
1) adding 85 parts by mass of carbonyl iron powder absorbent, 10 parts by mass of polyurethane elastomer, 1 part by mass of cyclohexane 1, 2-diisononyl phthalate plasticizer, 0.5 part by mass of N- (oxydiethylene) -2-benzothiazole sulfonamide accelerator, 1 part by mass of zinc stearate activator, 0.5 part by mass of 1010 and 168 anti-aging agents and 2 parts by mass of vulcanizing agent DCP into cyclohexanone solvent, and uniformly mixing and stirring to obtain premixed slurry;
2) coating the slurry obtained in the step (1) on a 50-micron PET film in a coating mode, drying the PET film through a drying channel, and then stripping the PET film to obtain a dry film of the wave-absorbing layer;
3) covering 50-micrometer PI films on two sides of the dry film obtained in the step 2, and performing hot press molding to obtain a coiled wave-absorbing material with the wave-absorbing layer thickness of 250 micrometers, wherein the total thickness of the wave-absorbing material is 350 micrometers;
4) and (3) carrying out double-sided adhesive tape on the back of the wave-absorbing material obtained in the step (3) to obtain the wave-absorbing material with a three-layer structure, and then carrying out die cutting to obtain the wave-absorbing material meeting the purposes of various modules.
Example 8
The preparation method of the wave-absorbing material for the folding screen comprises the following steps:
1) adding 90 parts by mass of carbonyl iron powder absorbent, 7 parts by mass of polyurethane elastomer, 0.5 part by mass of cyclohexane 1, 2-diisononyl phthalate plasticizer, 0.5 part by mass of N- (oxydiethylene) -2-benzothiazole sulfonamide accelerator, 0.5 part by mass of zinc stearate activator, 0.5 part by mass of 1010 and 168 anti-aging agent and 1 part by mass of vulcanizing agent DCP into cyclohexanone solvent, and uniformly mixing and stirring to obtain premixed slurry;
2) coating the slurry obtained in the step (1) on a 50-micron PET film in a coating mode, and drying the PET film in a drying channel to obtain a dry film without peeling off the PET film;
3) coating a 30-micron copper foil Mylar on the dry film obtained in the step (2), and performing hot press molding to obtain a coiled wave-absorbing material with the wave-absorbing layer thickness of 150 microns, wherein the total thickness of the wave-absorbing material is 230 microns;
4) and (3) performing die cutting on the wave-absorbing material obtained in the step (3) through double-sided adhesive on the back of an adhesive backing machine and the wave-absorbing material with a four-layer structure to obtain the wave-absorbing material meeting the application of various modules, and solving various interference problems existing in the wave-absorbing material.
Example 9
The preparation method of the wave-absorbing material for the folding screen comprises the following steps:
1) adding 85 parts by mass of ferrum-silicon-aluminum absorbent, 10 parts by mass of polyurethane elastomer, 1 part by mass of cyclohexane 1, 2-diisononyl phthalate plasticizer, 0.5 part by mass of N- (oxydiethylene) -2-benzothiazole sulfonamide accelerator, 1 part by mass of zinc stearate activator, 0.5 part by mass of 1010 and 168 anti-aging agents and 2 parts by mass of vulcanizing agent DCP into cyclohexanone solvent, and uniformly mixing and stirring to obtain premixed slurry;
2) coating the slurry obtained in the step (1) on a 50-micron PET film in a coating mode, drying the PET film through a drying channel, and then stripping the PET film to obtain a dry film of the wave-absorbing layer;
3) coating one surface of the dry film obtained in the step 2 with a 12-micron PET film for hot-press molding, and coating the other surface with 25-micron conductive cloth to obtain a coiled wave-absorbing material, wherein the thickness of the wave-absorbing layer is 30 microns, and the total thickness of the wave-absorbing material is 67 microns;
4) and (3) carrying out double-sided adhesive tape on the wave-absorbing material obtained in the step (3) through an adhesive tape backing machine to obtain the wave-absorbing material with a three-layer structure, and then carrying out die cutting to obtain the wave-absorbing material matched with the circuit board or the liquid crystal screen.
Example 10
The preparation method of the wave-absorbing material for the folding screen comprises the following steps:
1) adding 85 parts by mass of ferrum-silicon-aluminum absorbent, 10 parts by mass of polyurethane elastomer, 1 part by mass of cyclohexane 1, 2-diisononyl phthalate plasticizer, 0.5 part by mass of N- (oxydiethylene) -2-benzothiazole sulfonamide accelerator, 1 part by mass of zinc stearate activator, 0.5 part by mass of 1010 and 168 anti-aging agents and 2 parts by mass of vulcanizing agent DCP into cyclohexanone solvent, and uniformly mixing and stirring to obtain premixed slurry;
2) coating the slurry obtained in the step (1) on a 50-micron PET film in a coating mode, drying the PET film through a drying channel, and then stripping the PET film to obtain a dry film of the wave-absorbing layer;
3) covering one side of the dry film obtained in the step 2 with a 12-micron PET film for hot-press molding, and covering the other side with a 2-micron copper foil to obtain a coiled wave-absorbing material, wherein the thickness of the wave-absorbing layer is 30 microns, and the total thickness of the wave-absorbing material is 44 microns;
4) and (3) carrying out double-sided adhesive tape on the wave-absorbing material obtained in the step (3) through an adhesive tape backing machine to obtain the wave-absorbing material with a three-layer structure, and then carrying out die cutting to obtain the wave-absorbing material matched with the circuit board or the liquid crystal screen.
Fig. 5 is a schematic cross-sectional view of the wave-absorbing material of embodiment 10, and fig. 6 is a schematic structural view of the wave-absorbing material of embodiment 10, where 1 is an insulating layer, 2 is a wave-absorbing layer, and 3 is a conductive layer.
Comparative example 1
The commercially available wave-absorbing material A mainly comprises ferrum-silicon-aluminum and polyurethane.
Comparative example 2
The commercial wave-absorbing material B mainly comprises carbonyl iron powder and silicon rubber.
Performance testing
1. Test of folding Property
The wave-absorbing materials of examples 1-10 and comparative examples 1-2 were subjected to folding property test, the test method was: the size of a test sample is 260mm multiplied by 200mm, the sample is placed on a test platform, the folding angle is set to be 180 degrees, the test speed is set to be 10 times/minute, a test program is operated, the sample starts to be repeatedly folded, and whether the appearance of the folded part cracks or not is observed after the test is finished. And recording the folding times of the wave-absorbing material when the wave-absorbing material cracks, wherein the test results are shown in table 1.
Table 1: results of testing folding Properties of examples 1 to 10 and comparative examples 1 to 2
Figure BDA0003373780450000091
Figure BDA0003373780450000101
As shown in the test results of Table 1, the wave-absorbing material prepared by the method has excellent folding performance, the folding times of the wave-absorbing material are 10000-100000 times, and compared with the wave-absorbing material sold in the market, the wave-absorbing material has more excellent folding performance.
2. Permeability test
The wave-absorbing materials of examples 1-5, 9-10 and comparative example 1 were subjected to magnetic permeability test, the test method being: the test sample was in the shape of a coil with dimensions: the outer diameter is 20mm, the inner diameter is 9.9mm, the thickness is more than or equal to 0.3mm, an impedance analyzer (instrument model: E4991b, clamp model: 16454A) is adopted, the scanning frequency is 3MHz, and the test results are shown in Table 2.
Table 2: permeability test results of examples 1 to 5, examples 9 to 10, and comparative example 1
Sample (I) Relative magnetic permeability
Example 1 150
Example 2 180
Example 3 200
Example 4 220
Example 5 250
Example 9 275
Example 10 300
Comparative example 1 150
As shown in the test results in Table 2, the wave-absorbing material prepared by the method has excellent magnetic permeability, the relative magnetic permeability of the wave-absorbing material is in the range of 150-300, and the wave-absorbing material has relatively more excellent relative magnetic permeability compared with the commercially available wave-absorbing material A.
3. Reflection loss test
The reflection loss test standard is as follows: the radar wave-absorbing material reflectivity test method GJB 2038A-2011 shows the test results in Table 3.
Table 3: results of reflection loss test of examples 6 to 8 and comparative example 2
Sample (I) Peak reflection loss/dB
Example 6 -35-45
Example 7 -35-45
Example 8 -35-45
Comparative example 2 -10-15
The test results in Table 3 show that the peak reflection loss of the wave-absorbing material prepared by the method is-35 dB to 45dB, and the wave-absorbing material has better reflection loss performance compared with the wave-absorbing material B sold in comparative example 2.
As can be seen from the performance tests, the wave-absorbing material prepared by the method has excellent magnetic conductivity and reflection loss, the tested magnetic conductivity is 150-250H/m, and the reflection loss is-35 dB to 45 dB; the wave-absorbing material is repeatedly folded for 10000 times and 100000 times without breaking; the wave-absorbing material can be made into coiled materials or sheets and applied to the field of foldable screens.
The above examples are preferred embodiments of the present invention, but the present invention is not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and they are included in the scope of the present invention.

Claims (10)

1. A wave-absorbing material for a folding screen is characterized in that: the wave-absorbing material is of a laminated structure and comprises a bottom layer, a middle layer and a top layer; the bottom layer is a first insulating layer; the middle layer is a wave absorbing layer; the top layer includes a second insulating layer, or a conductive layer, or a stacked second insulating layer and conductive layer.
2. The wave-absorbing material according to claim 1, wherein: the first insulating layer and the second insulating layer respectively comprise at least one of polyolefin, polyester and polyamide; the conducting layer comprises at least one of copper foil, aluminum foil mylar, copper foil mylar and conducting cloth.
3. The wave-absorbing material according to claim 2, wherein: the wave-absorbing material meets at least one of the following conditions:
the thickness of the wave-absorbing layer is 20-1000 μm;
the thickness of the first insulating layer is 1-1000 μm;
the thickness of the second insulating layer is 1-1000 μm;
the thickness of the conductive layer is 1-1000 μm;
the thickness of the wave-absorbing material is 20-3000 μm.
4. The wave-absorbing material according to claim 3, wherein: the wave-absorbing layer comprises the following components: absorbent, adhesive and auxiliary materials;
the auxiliary materials comprise at least one of a plasticizer, a promoter, an activator, an anti-aging agent and a vulcanizing agent.
5. The wave-absorbing material according to claim 4, wherein: the absorbent comprises at least one of a carbon-series wave-absorbing material, an iron-series wave-absorbing material, a ceramic-series wave-absorbing material, an alloy-series wave-absorbing material, a conductive polymer wave-absorbing material, a chiral wave-absorbing material and a plasma wave-absorbing material; the adhesive comprises at least one of elastomer, resin and rubber.
6. The wave-absorbing material according to claim 4, wherein: the absorbent in the wave absorbing layer is as follows: adhesive agent: the mass ratio of the auxiliary materials is (8-30): (0.5-7): 1.
7. a wave-absorbing material according to any one of claims 1 to 6, characterized in that: the relative magnetic permeability of the wave-absorbing material at 3MHz is 5-300.
8. A method for preparing a wave-absorbing material for a folding screen according to any one of claims 4 to 7, characterized in that: the method comprises the following steps:
1) mixing an absorbent, an adhesive and auxiliary materials, and molding to obtain the intermediate layer;
2) and superposing the middle layer with the top layer and the bottom layer, and molding to obtain the wave-absorbing material.
9. The method of claim 8, wherein: in the step 1), the forming method comprises hot pressing, film bonding or bonding; in the step 2), the forming method comprises coating or calendering.
10. Use of a wave-absorbing material for a folding screen according to any one of claims 1-7 in the field of foldable screens.
CN202111410910.3A 2021-11-25 2021-11-25 Wave-absorbing material for folding screen and preparation method and application thereof Pending CN114179449A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111410910.3A CN114179449A (en) 2021-11-25 2021-11-25 Wave-absorbing material for folding screen and preparation method and application thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111410910.3A CN114179449A (en) 2021-11-25 2021-11-25 Wave-absorbing material for folding screen and preparation method and application thereof

Publications (1)

Publication Number Publication Date
CN114179449A true CN114179449A (en) 2022-03-15

Family

ID=80602555

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111410910.3A Pending CN114179449A (en) 2021-11-25 2021-11-25 Wave-absorbing material for folding screen and preparation method and application thereof

Country Status (1)

Country Link
CN (1) CN114179449A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115966916A (en) * 2022-12-30 2023-04-14 浙江盛发纺织印染有限公司 Radar wave-absorbing material and production process thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202480495U (en) * 2011-11-03 2012-10-10 3M材料技术（广州）有限公司 Wave absorber
CN105025694A (en) * 2015-07-28 2015-11-04 苏州驭奇材料科技有限公司 Electromagnetic wave absorbing material with protective layer and manufacturing method of electromagnetic wave absorbing material
CN206341556U (en) * 2016-12-27 2017-07-18 苏州佳值电子工业有限公司 Inhale ripple material
CN109651799A (en) * 2018-12-19 2019-04-19 航天科工武汉磁电有限责任公司 Wave absorbing patch, preparation method and its application
CN213522950U (en) * 2020-11-05 2021-06-22 深圳市乐迪威科技有限公司 PI wave absorbing plate

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202480495U (en) * 2011-11-03 2012-10-10 3M材料技术（广州）有限公司 Wave absorber
CN105025694A (en) * 2015-07-28 2015-11-04 苏州驭奇材料科技有限公司 Electromagnetic wave absorbing material with protective layer and manufacturing method of electromagnetic wave absorbing material
CN206341556U (en) * 2016-12-27 2017-07-18 苏州佳值电子工业有限公司 Inhale ripple material
CN109651799A (en) * 2018-12-19 2019-04-19 航天科工武汉磁电有限责任公司 Wave absorbing patch, preparation method and its application
CN213522950U (en) * 2020-11-05 2021-06-22 深圳市乐迪威科技有限公司 PI wave absorbing plate

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
顾志强: "《黑科技 硅谷15位技术咖 21项前沿科技将如何创造未来》", 31 March 2017, 北京：中国友谊出版公司 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115966916A (en) * 2022-12-30 2023-04-14 浙江盛发纺织印染有限公司 Radar wave-absorbing material and production process thereof
CN115966916B (en) * 2022-12-30 2023-08-11 浙江盛发纺织印染有限公司 Radar wave-absorbing material and production process thereof

Similar Documents

Publication Publication Date Title
CN206650912U (en) High shielding EMI screened films
KR101407684B1 (en) Electromagnetic shielding material for fpc
KR20190012242A (en) Conductive adhesive layer and electromagnetic wave shield material for fpc
TWI479986B (en) A magnetic filler, a resin composition containing the same, a sheet for suppressing the interference of electromagnetic waves, and a method for suppressing the electromagnetic wave interference sheet
EP2624676A1 (en) Electromagnetic wave shielding sheet for use in wireless power transmission
CN104134513A (en) Soft-magnetic composite film and manufacturing method and application of soft-magnetic composite film in electronic equipment
CN105101761A (en) High-transmission thin electromagnetic interference shielding film, and manufacturing method and applications thereof
KR101549988B1 (en) Magnetic sheet separated from coverlay and flexible printed circuit board and manufacturing method thereof
CN108749240B (en) Insulating layer light-tight flexible copper-clad plate, preparation method and application thereof
TWI765306B (en) Flexible printed circuits having high electromagnetic shielding property and preparing methods thereof
CN206481556U (en) Have the high shielding EMI screened films of black polyamide thin film
CN114179449A (en) Wave-absorbing material for folding screen and preparation method and application thereof
JP2010153542A (en) Electromagnetic wave suppression sheet and method of manufacturing the same
CN103144376A (en) Composite copper clad laminate with electromagnetic shielding effect and manufacture method thereof
CN213924617U (en) Composite adhesive tape capable of shielding and absorbing electromagnetic waves
CN105101762B (en) It is thinned high-transmission emi shielding film and its manufacturing method and application
CN203859982U (en) High-transmission thin electromagnetic interference shielding film and printed circuit board having same
CN203859981U (en) Thin high-transmission electromagnetic interference shielding film and printed circuit board having same
CN204939377U (en) Conductive shield adhesive tape
CN108513521A (en) Have the high shielding EMI screened films and preparation method thereof of black polyamide thin film
CN202480495U (en) Wave absorber
CN203157257U (en) Compound type copper foil base plate with electromagnetic shielding effect
KR20160103397A (en) Coated tape with preventing electromagnetic interference and method for manufacturing of the same
CN111410920A (en) Wave-absorbing shielding adhesive film and preparation method thereof
CN202941035U (en) Electromagnetic interference shielding structure and flexible printed circuit board with same

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination