CN115466483B - Electromagnetic shielding material and preparation method and application thereof - Google Patents
Electromagnetic shielding material and preparation method and application thereof Download PDFInfo
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- CN115466483B CN115466483B CN202211066766.0A CN202211066766A CN115466483B CN 115466483 B CN115466483 B CN 115466483B CN 202211066766 A CN202211066766 A CN 202211066766A CN 115466483 B CN115466483 B CN 115466483B
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- 239000000463 material Substances 0.000 title claims abstract description 81
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 44
- 239000004696 Poly ether ether ketone Substances 0.000 claims abstract description 44
- 239000004917 carbon fiber Substances 0.000 claims abstract description 44
- 229920002530 polyetherether ketone Polymers 0.000 claims abstract description 44
- 239000011347 resin Substances 0.000 claims abstract description 43
- 229920005989 resin Polymers 0.000 claims abstract description 43
- 239000011521 glass Substances 0.000 claims abstract description 36
- 239000011324 bead Substances 0.000 claims abstract description 31
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000010301 surface-oxidation reaction Methods 0.000 claims abstract description 16
- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical compound OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 claims abstract 8
- 238000000034 method Methods 0.000 claims description 18
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 11
- 229910017604 nitric acid Inorganic materials 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 10
- 229910052709 silver Inorganic materials 0.000 claims description 9
- 239000004332 silver Substances 0.000 claims description 9
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- 230000000694 effects Effects 0.000 abstract description 15
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
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- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/16—Solid spheres
- C08K7/18—Solid spheres inorganic
- C08K7/20—Glass
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/06—Elements
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/02—Ingredients treated with inorganic substances
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/06—Cavity resonators
-
- 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
Abstract
The application relates to an electromagnetic shielding material, a preparation method and application thereof, belonging to the technical field of high polymer materials, wherein the components of the material comprise: PEEK resin, glass beads and carbon fibers subjected to surface oxidation treatment; the technology prejudice that the current electromagnetic shielding material only adopts an amorphous polymer matrix composite material as a matrix resin is overcome by using a semi-crystalline polymer PEEK resin as the matrix resin, and the matrix resin PEEK is not only a semi-crystalline polymer, but also is almost insoluble in any organic solvent at normal temperature, and the carbon fiber and glass microsphere two wave absorber fillers are easy to agglomerate themselves, so that the components have better compatibility and interface effect by adopting the carbon fiber subjected to surface oxidation treatment.
Description
Technical Field
The application relates to the field of high polymer materials, in particular to an electromagnetic shielding material and a preparation method and application thereof.
Background
With the development of electronic information technology, various electronic and electric equipment are widely applied, so that living space of people is filled with various electromagnetic waves, convenience is brought to the life of people, meanwhile, hazards caused by electromagnetic interference (electromagnetic interference, EMI for short) are gradually valued by people, normal work of various electronic and electric equipment is affected, and hazards are brought to human health. In order to reduce the harmful effect of electromagnetic wave, the propagation of electromagnetic wave is controlled in a certain area range, so that electromagnetic shielding is carried out, namely, a low-resistance conductor material is adopted, and the electromagnetic wave is reflected on the surface of a shielding conductor, absorbed in the conductor and lost in the transmission process to generate shielding effect.
Currently, research into electromagnetic shielding materials is more focused on amorphous polymer-based composite materials, and on wave absorbers, while few reports are made on crystalline polymer-based composite electromagnetic shielding materials. This is mainly because amorphous polymers are easier to achieve, whether physically or chemically modified, due to their solubility characteristics, and because the wave-absorber filler is also easier to disperse therein.
Disclosure of Invention
The application provides an electromagnetic shielding material, a preparation method and application thereof, and aims to solve the technical prejudice that the existing electromagnetic shielding material only adopts an amorphous polymer-based composite material as a matrix material.
In a first aspect, the present application provides an electromagnetic shielding material.
Specifically, the components of the material include: PEEK resin, glass beads and carbon fibers with surface oxidation treatment.
As an alternative embodiment, the carbon surface-oxidized is carbon fiber surface-oxidized with concentrated nitric acid.
As an alternative embodiment, at least part of the surface of the glass bead is coated with silver.
As an alternative embodiment, the composition of the material comprises, in mass fraction: 80-90% of PEEK resin, 5-15% of glass beads and 2-10% of carbon fibers subjected to surface oxidation treatment.
As an alternative embodiment, the composition of the material comprises, in mass fraction: 83% -87% of PEEK resin, 8% -12% of glass beads and 4% -8% of carbon fibers subjected to surface oxidation treatment.
In a second aspect, the present application provides a method for preparing an electromagnetic shielding material, so as to implement the preparation of the electromagnetic shielding material according to any one of the embodiments of the first aspect.
Specifically, the method comprises the following steps:
premixing PEEK resin, glass beads and carbon fibers subjected to surface oxidation treatment to obtain a premix;
and heating, melting and granulating the premix to obtain the electromagnetic shielding material.
As an alternative embodiment, the temperature of the heat fusion is 350-400 ℃.
As an alternative embodiment, the method further comprises: the PEEK resin was dried.
As an alternative embodiment, the drying temperature is 140-160 ℃ and the drying time is 3-5 hours.
In a third aspect, the present application provides a resonant cavity. Use as an electromagnetic shielding material according to any one of the embodiments of the first aspect.
Specifically, at least part of the material of the resonant cavity is the electromagnetic shielding material.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
according to the method provided by the embodiment of the application, the semi-crystalline polymer PEEK resin is used as the matrix resin, the technical prejudice that the existing electromagnetic shielding material only adopts an amorphous polymer matrix composite material as the matrix material is overcome, and in view of the fact that the matrix resin PEEK is not only a semi-crystalline polymer, but also is almost insoluble in any organic solvent at normal temperature, and the carbon fiber and the glass microsphere are easy to agglomerate by themselves, so that the components have better compatibility and interface effect by adopting the carbon fiber subjected to surface oxidation treatment.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a flow chart of a method provided by an embodiment of the present application;
fig. 2 is a schematic structural diagram of a resonant cavity provided in an embodiment of the present application;
FIG. 3 is a schematic diagram of a dual layer magnetic screen structure provided in an embodiment of the present application;
fig. 4 is a schematic diagram of a layout of a chamber cover according to an embodiment of the present application.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.
Unless specifically indicated otherwise, the various raw materials, reagents, instruments, equipment, and the like used in this application are commercially available or may be prepared by existing methods.
The embodiment of the application provides an electromagnetic shielding material, which comprises the following components: PEEK resin, glass beads and carbon fibers with surface oxidation treatment.
The technology prejudice that the current electromagnetic shielding material only adopts an amorphous polymer matrix composite material as a matrix resin is overcome by using a semi-crystalline polymer PEEK resin as the matrix resin, and the matrix resin PEEK is not only a semi-crystalline polymer, but also is almost insoluble in any organic solvent at normal temperature, and the carbon fiber and glass microsphere two wave absorber fillers are easy to agglomerate themselves, so that the components have better compatibility and interface effect by adopting the carbon fiber subjected to surface oxidation treatment.
In this embodiment, the carbon surface-oxidized is carbon fiber surface-oxidized with concentrated nitric acid.
Specifically, the method for surface oxidation treatment of carbon fiber by concentrated nitric acid comprises the following steps: and (3) adopting 8-10 mol/L nitric acid to dip, oxidize and modify the carbon fiber for 4-6h at 60-80 ℃.
In some embodiments, at least a portion of the surface of the glass microspheres is coated with silver.
In some embodiments, the composition of the material comprises, in mass fraction: 80-90% of PEEK resin, 5-15% of glass beads and 2-10% of carbon fibers subjected to surface oxidation treatment.
The PEEK resin has the functions of matrix resin, controlling the mass fraction of the PEEK resin to be 80% -90%, under the condition of the proportion, the mechanical and electromagnetic shielding performance is optimal, the adverse effect of the excessive mass fraction is that the components of the wave absorber are too few, the electromagnetic shielding performance is too low, the adverse effect of the too little is that the resin is too few, and the mechanical performance is poor.
The glass beads are used as magnetic loss sources, the mass fraction of the glass beads is controlled to be 5% -10%, the mechanical property and the electromagnetic shielding property of the material are optimal under the condition of the proportion, the adverse effect of the excessive mass fraction is poor in dispersibility, the glass beads cannot be well mixed with a matrix material, the mechanical property of the material is poor, and the adverse effect of the excessive mass fraction is poor in electromagnetic shielding property of the material.
The carbon fiber has the functions of a dielectric loss source, the mass fraction of the dielectric loss source is controlled to be 2% -10%, the mechanical property and the electromagnetic shielding property of the material are optimal under the condition of the proportion, the adverse effect of the excessive mass fraction is poor in dispersibility, the material cannot be well mixed with a matrix material, the mechanical property of the material is poor, and the adverse effect of the excessively small mass fraction is poor in electromagnetic shielding property of the material.
Further, the material comprises the following components in percentage by mass: 83% -87% of PEEK resin, 8% -12% of glass beads and 4% -8% of carbon fibers subjected to surface oxidation treatment.
Polyether ether ketone (PEEK) with excellent mechanical property, thermal stability and processability is selected as matrix resin, carbon fiber is used as dielectric loss source, and glass beads are used as magnetic loss source. In view of the fact that the matrix resin PEEK is not only a semi-crystalline polymer, but also is hardly dissolved in any organic solvent at normal temperature, and two wave-absorbing agent fillers of carbon fiber and glass beads are easy to agglomerate, the carbon fiber is oxidized by concentrated nitric acid to surface treat the carbon fiber, and the glass beads are coated by silver, so that the problem of agglomeration of the two wave-absorbing agents is solved, the PEEK matrix has better compatibility and interface effect, after the carbon fiber is oxidized by the concentrated nitric acid, the surface of the carbon fiber is connected with organic groups such as carbonyl and carboxyl, and interface combination of the carbon fiber and the resin matrix is facilitated; silver particles are coated on the surfaces of the glass beads, so that interface polarization can be increased, and the dispersibility of the nano particles in a resin matrix can be improved, so that the polyether-ether-ketone-based electromagnetic shielding composite material with integrated structure and function is prepared. The uniform dispersion of carbon fiber and glass bead particles in the PEEK matrix is beneficial to the construction of the high-performance PEEK-based electromagnetic shielding composite material, the dielectric loss and the magnetic loss are exerted together, and the electromagnetic shielding performance of the PEEK-based electromagnetic shielding composite material is effectively improved.
As shown in fig. 1, the embodiment of the present application further provides a method for preparing an electromagnetic shielding material based on one general inventive concept.
The preparation method of the electromagnetic shielding material is used for realizing the preparation of the electromagnetic shielding material, and the specific limitation of the electromagnetic shielding material can refer to the embodiment, and because the preparation method of the electromagnetic shielding material adopts part or all of the technical schemes of the embodiment, the electromagnetic shielding material has at least all the beneficial effects brought by the technical schemes of the embodiment, and the description is omitted herein.
In detail, the method comprises the following steps:
s0. the PEEK resin is dried, and the PEEK resin comprises the following components in percentage by mass according to a material formula: 80-90% of PEEK resin, 5-15% of glass beads and 2-10% of carbon fiber, and each component is accurately weighed.
Generally, the PEEK resin has a mass water content of less than or equal to 0.2%, and specifically can be treated in a drying manner, wherein the drying temperature is 140-160 ℃, and the drying time is 3-5h.
The reason for controlling the granulation temperature is that: firstly, the melting point of PEEK resin is 340 ℃, and 350-400 are ideal processing temperature ranges. The resin is not melted or only partially melted, and the additive is likely to be partially degraded.
S1, premixing PEEK resin, glass beads and carbon fibers subjected to surface oxidation treatment to obtain a premix;
specifically, in this embodiment, the dried PEEK resin, silver-coated glass bead particles, and concentrated nitric acid surface-treated carbon fiber are sequentially poured into a stirring barrel, and the materials are premixed for 3-5 min, and the premixed material is prepared after uniform mixing.
S2, heating, melting and granulating the premix to obtain the electromagnetic shielding material.
Specifically, in this example, the premix was melted by heating and pelletized by a twin screw extruder to obtain an electromagnetic shielding material.
In some embodiments, the temperature of the heat fusion is 350-400 ℃.
As shown in fig. 2 to 3, the embodiment of the present application further provides a resonant cavity based on one general inventive concept.
The resonant cavity is an application way of the electromagnetic shielding material, the specific limitation of the electromagnetic shielding material can refer to the embodiment, and as the resonant cavity adopts part or all of the technical schemes of the embodiment, at least all of the beneficial effects brought by the technical schemes of the embodiment are provided, and the detailed description is omitted.
At least part of the material of the resonant cavity is the electromagnetic shielding material provided above. In detail, the obtained magnetic screen material is subjected to injection molding treatment on the resonant cavity, and the resonant cavity has the following specific structure:
the solar energy power generation device mainly comprises a resonant cavity, a liner cavity, a photocell, a temperature control component, a magnetic induction coil and a magnetic shielding barrel, and is shown in figure 1. The resonant cavity consists of a cavity body, a cavity cover, a coupling ring and a tuning screw, and the temperature control component consists of a thermistor and a heating wire; the magnetic induction coil layer consists of a primary magnetic screen layer and a secondary magnetic screen layer, and the material of the magnetic induction coil layer is formed by injection molding the obtained carbon fiber material.
In the figure, 1 is a liner cavity, the inside of the liner cavity is tightly sealed and filled with rubidium element and inert gas, 1.1 is a liner cavity wall, and a paraffin layer is coated on the wall for weakening the atomic relaxation effect; the top end of the liner cavity is provided with a coupling ring 1.2 which is used for providing magnetic coupling for 0-0 microwave resonance transition of an atomic hyperfine structure; an alloy end cover 1.3 is arranged in the cavity of the liner and is used for compensating the cavity frequency change caused by the temperature change; the outside of the inner container cavity is wrapped with a cylindrical body cavity layer 2; a layer of heating coil 2.1 is arranged on the side wall of the cavity layer, and double-wire twist winding is adopted for providing a constant temperature environment for the cavity; the periphery of the cavity body is provided with a magnetic induction coil layer 3; an enamelled coil 3.1 is wound outside the magnetic induction coil layer, and is tightly wound by adopting a double layer for providing energy level transition and quantization axes for the atoms in the inner container cavity; the inner bottom of the cavity body is provided with a bracket 2.2 which is used for placing the liner cavity 1; the top of the cavity layer is provided with a cavity cover 2.3, and the center of the cavity cover is provided with a light passing grating for light passing; the left side of the cavity cover is provided with a thermistor 2.4 for monitoring the cavity temperature and controlling the temperature; a tuning screw 2.5 is arranged on the cavity cover, and the cavity frequency is finely tuned by changing the length of the tuning screw in the cavity (the fine tuning range is approximately within 100 MHz); the cavity cover is provided with a printed board 2.6 on which electronic elements and circuits are distributed, so that the temperature control and detection functions are completed; the cavity cover is provided with a photocell 2.7 for detecting the light transmission intensity and simultaneously completing the link of converting the light signal into an electric signal and transmitting the electric signal to a detection circuit on the printed board 2.6; the outer periphery of the cavity body is sleeved with a cylindrical primary inner magnetic screen layer 4; spring bayonet devices 2.8.1 and 2.8.2 are arranged between the two sides of the cavity cover and the inner wall of the primary inner magnetic screen layer, and the function of the spring bayonet devices is to assist the primary inner magnetic screen layer and the cavity to be fixed into a whole; the outer part of the first-stage inner magnetic screen layer is sleeved with a cylindrical second-stage outer magnetic screen layer 5 which is used for shielding an external magnetic field; two spring bayonets 4.2.1 and 4.2.2 are arranged between the outer wall of the primary magnetic screen layer and the secondary outer magnetic screen layer, and the function of the two spring bayonets is to assist the primary inner magnetic screen layer and the secondary outer magnetic screen layer to be fixed into a whole; a base 6 is arranged at the bottoms of the cavity layer, the primary inner magnetic screen layer and the secondary outer magnetic screen layer; the base is provided with a circular clamping groove 6.1 for assisting in fixing the cavity; the base is provided with a circular clamping groove 6.2 for assisting in fixing the first-stage inner magnetic screen layer; the base is provided with a circular clamping groove 6.3 for assisting in fixing the two-stage outer magnetic screen layer.
In order to correspond to the specific structure of the magnetic treatment, the structure of the cavity cover is shown in fig. 4, considering that the light of the spectrum lamp part needs to be irradiated into the cavity.
The present application is further illustrated below in conjunction with specific examples. It should be understood that these examples are illustrative only of the present application and are not intended to limit the scope of the present application. The experimental procedures, which are not specified in the following examples, are generally determined according to national standards. If the corresponding national standard does not exist, the method is carried out according to the general international standard, the conventional condition or the condition recommended by the manufacturer.
Examples 1 to 5
A method for preparing an electromagnetic shielding material, the method comprising:
(1) According to the material formula, the material comprises the following components in percentage by mass: 80-90% of PEEK, 5-15% of glass beads and 2-10% of carbon fibers, and precisely weighing the components;
the formulation of each example is as follows:
| example 1 | Example 2 | Example 3 | Example 4 | Example 5 | |
| PEEK | 85.0％ | 84.0％ | 83.0％ | 80.0％ | 87.0％ |
| Glass bead | 9.0％ | 12.0％ | 15.0％ | 14.0％ | 10.0％ |
| Carbon fiber | 6.0％ | 4.0％ | 2.0％ | 6.0％ | 3.0％ |
(2) Sequentially pouring the dried PEEK resin, silver-coated glass bead particles and concentrated nitric acid surface-treated carbon fibers into a stirring barrel, premixing the materials for 3-5 min, and uniformly mixing to obtain an initial mixture;
(3) The initial mixture is put into a main hopper of a double-screw extruder, and is heated, melted, extruded and granulated to finally obtain the magnetic shielding material; wherein the specific processing temperature of the twin-screw extruder is controlled between 350 and 400 ℃.
Comparative examples 1 to 3
A method for preparing an electromagnetic shielding material, the method comprising:
(2) Precisely weighing the components according to a material formula;
the formulation of each comparative example is as follows:
| comparative example 1 | Comparative example 2 | Comparative example 3 | |
| PEEK | 100％ | 85.0％ | 85.0％ |
| Glass bead | / | 15.0％ | / |
| Carbon fiber | / | / | 15.0％ |
(2) Sequentially pouring the dried PEEK resin, silver-coated glass bead particles and concentrated nitric acid surface-treated carbon fibers into a stirring barrel, premixing the materials for 3-5 min, and uniformly mixing to obtain an initial mixture;
(3) The initial mixture is put into a main hopper of a double-screw extruder, and is heated, melted, extruded and granulated to finally obtain the magnetic shielding material; wherein the specific processing temperature of the twin-screw extruder is controlled between 350 and 400 ℃.
Related experiment and effect data:
the materials prepared in examples 1 to 5 and comparative examples 1 to 3 were subjected to performance tests, and the test results are shown in the following table:
as can be obtained from the table, in the embodiments 1 to 5 of the present invention, by compounding the glass beads and the carbon fibers in different proportions, not only are excellent mechanical properties and electromagnetic shielding properties of the material simultaneously provided, but also the amount of the glass beads or the hollow carbon fibers added independently is reduced, and the cost is reduced. The carbon fiber subjected to surface treatment by concentrated nitric acid and the silver coated glass microsphere particles solve the problem of agglomeration, and have better compatibility and interface effect with the PEEK matrix, so that the mechanical property of the PEEK composite material is increased. The hollow microsphere reinforced nylon material prepared by the embodiments 1-3 is a protective material capable of preventing electromagnetic waves from being transmitted and diffused, limiting radiant energy within a safe range and reducing the harm of electromagnetic waves, and has the effect of electromagnetic shielding inside and outside objects.
Various embodiments of the present application may exist in a range format; it should be understood that the description in a range format is merely for convenience and brevity and should not be interpreted as a rigid limitation on the scope of the application. It is therefore to be understood that the range description has specifically disclosed all possible sub-ranges and individual values within that range. For example, it should be considered that a description of a range from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5, and 6, wherever applicable. In addition, whenever a numerical range is referred to herein, it is meant to include any reference number (fractional or integer) within the indicated range.
In this application, unless otherwise indicated, terms of orientation such as "upper" and "lower" are used specifically to refer to the orientation of the drawing in the figures. In addition, in the description of the present application, the terms "include", "comprise", "comprising" and the like mean "including but not limited to". Relational terms such as "first" and "second", and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Herein, "and/or" describing an association relationship of an association object means that there may be three relationships, for example, a and/or B, may mean: a alone, a and B together, and B alone. Wherein A, B may be singular or plural. Herein, "at least one" means one or more, and "a plurality" means two or more. "at least one", "at least one" or the like refer to any combination of these items, including any combination of single item(s) or plural items(s). For example, "at least one (individual) of a, b, or c," or "at least one (individual) of a, b, and c," may each represent: a, b, c, a-b (i.e., a and b), a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple, respectively.
The foregoing is merely a specific embodiment of the application to enable one skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. An electromagnetic shielding material, characterized in that the material comprises the following components in percentage by mass: 80% -90% of PEEK resin, 5% -15% of glass beads and 2% -10% of carbon fibers subjected to surface oxidation treatment, wherein at least part of the surfaces of the glass beads are coated with silver.
2. The electromagnetic shielding material according to claim 1, wherein the surface-oxidized carbon fiber is a concentrated nitric acid surface-oxidized carbon fiber.
3. The electromagnetic shielding material according to claim 1, wherein the composition of the material comprises, in mass fraction: 83% -87% of PEEK resin, 8% -12% of glass beads and 4% -8% of carbon fibers subjected to surface oxidation treatment.
4. A method for producing an electromagnetic shielding material, characterized in that the material is the electromagnetic shielding material according to any one of claims 1 to 3, the method comprising:
premixing PEEK resin, glass beads and carbon fibers subjected to surface oxidation treatment to obtain a premix;
and heating, melting and granulating the premix to obtain the electromagnetic shielding material.
5. The method of producing an electromagnetic shielding material according to claim 4, wherein the temperature of the heating and melting is 350 to 400 ℃.
6. The method for producing an electromagnetic shielding material according to claim 4, characterized in that the method further comprises: the PEEK resin is dried so that the mass water content of the PEEK resin is less than or equal to 0.2 percent.
7. The method of producing an electromagnetic shielding material according to claim 6, wherein the drying temperature is 140 to 160 ℃, and the drying time is 3 to 5 hours.
8. A resonant cavity, wherein at least part of the material of the resonant cavity is the electromagnetic shielding material of any one of claims 1 to 3.
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