CN112724687A - Carbon fiber electromagnetic shielding material and preparation method thereof - Google Patents

Carbon fiber electromagnetic shielding material and preparation method thereof Download PDF

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Publication number
CN112724687A
CN112724687A CN202011604262.0A CN202011604262A CN112724687A CN 112724687 A CN112724687 A CN 112724687A CN 202011604262 A CN202011604262 A CN 202011604262A CN 112724687 A CN112724687 A CN 112724687A
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carbon fiber
electromagnetic shielding
shielding material
weight
plating
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高文廷
范勇
程亚东
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Shanghai Allied Industrial Co ltd
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Shanghai Allied Industrial Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
    • C08L83/04—Polysiloxanes
    • 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
    • H05K9/009—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising electro-conductive fibres, e.g. metal fibres, carbon fibres, metallised textile fibres, electro-conductive mesh, woven, non-woven mat, fleece, cross-linked
    • 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
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/08—Metals
    • C08K2003/085—Copper
    • 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
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/08—Metals
    • C08K2003/0862—Nickel
    • 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
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/38—Boron-containing compounds
    • C08K2003/382—Boron-containing compounds and nitrogen
    • C08K2003/385—Binary compounds of nitrogen with boron
    • 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
    • C08K2201/00—Specific properties of additives
    • C08K2201/001—Conductive additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Electromagnetism (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Health & Medical Sciences (AREA)
  • Textile Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

The invention relates to the technical field of composite materials, and particularly provides a carbon fiber electromagnetic shielding material and a preparation method thereof. The invention provides a carbon fiber electromagnetic shielding material, which comprises 20-60 parts by weight of modified carbon fiber and 40-80 parts by weight of a curing and shaping material. The surface heat-conducting property of the carbon fiber electromagnetic shielding material can be obviously improved through the interaction of the components, and the overall shielding efficiency of the material is effectively improved; the preparation method is simple and convenient, has strong universality and is suitable for large-scale popularization and use.

Description

Carbon fiber electromagnetic shielding material and preparation method thereof
Technical Field
The invention relates to the technical field of composite materials, and particularly provides a carbon fiber electromagnetic shielding material and a preparation method thereof.
Background
Because electromagnetic devices are generally applied in modern society, more and more electromagnetic interference problems are brought, and the inorganic composite electromagnetic shielding material has attracted wide attention as a potential material in the aspects of electromagnetic interference resistant buildings, communication tools and the like due to high stability, easy compatibility and high heat resistance. The electromagnetic shielding material not only needs to have good electromagnetic wave reflecting performance, but also needs to have good electromagnetic wave absorbing performance, and the composite wave absorbing material with thinness, lightness, width and strength is a hotspot and difficulty in the research of the electromagnetic wave absorbing material.
The carbon fiber is a special fiber composed of carbon elements, has the characteristics of high temperature resistance, friction resistance, electric conduction, heat conduction, corrosion resistance and the like, is fibrous and soft in appearance, and can be processed into various fabrics. Compared with metal materials, the carbon fiber has insufficient conductivity, in the electromagnetic shielding application, the chopped carbon fiber is less directly applied, and is mostly applied in the form of carbon fiber fabrics such as carbon fiber cloth, and the conductivity and the electromagnetic shielding performance of the carbon fiber can be improved by surface metallization treatment, but the problems of poor conductivity and low electromagnetic shielding efficiency are easy to occur sometimes. In addition, in order to improve the market competitiveness of the carbon fiber reinforced resin matrix composite, a certain amount of functional filler is usually added into the composite additionally, at present, the functional filler is generally directly added into a resin base material for compounding, but most of the functional fillers are small in size and easy to agglomerate, so that the functional fillers are difficult to disperse uniformly in the resin base material, and the electromagnetic shielding performance of the material is unstable.
Disclosure of Invention
In order to solve the technical problems, the invention provides a carbon fiber electromagnetic shielding material in a first aspect, and the preparation material comprises 20-60 parts by weight of modified carbon fiber and 40-80 parts by weight of a curing and shaping material.
As a preferred technical solution of the present invention, the preparation method of the modified carbon fiber comprises the following steps:
(1) adding carbon fibers into a surface treating agent for pretreatment;
(2) and plating metal on the surface of the carbon fiber.
As a preferable technical scheme of the invention, the metal plating is selected from one or a combination of more of copper plating, nickel plating and chromium plating.
As a preferred technical solution of the present invention, the electroless plating solution for nickel plating comprises: 25-35 g/L nickel sulfate, 25-40 g/L sodium citrate and 20-30 g/L sodium hypophosphite, wherein the chemical plating process conditions are as follows: the temperature is 60-75 ℃, the time is 3-10 min, and the pH value is adjusted to 7.5-8.5 by adopting ammonia water.
As a preferred technical solution of the present invention, the cured setting material includes a matrix resin and a conductive filler.
As a preferred technical scheme of the invention, the conductive filler is selected from one or a combination of more of graphite, graphene, carbon black, carbon nanotubes, diamond, aluminum, silver, gold and copper.
As a preferable embodiment of the present invention, the conductive filler includes carbon black and copper; the mass ratio of the carbon black to the copper is 1: (0.1-0.3).
As a preferable technical scheme of the invention, the specific surface area of the carbon black is 700-1200 m2Per kg; the particle size of the copper is 30-40 mu m.
According to a preferable technical scheme, the matrix resin comprises, by weight, 10-12 parts of silicone resin, 0.05-0.5 part of catalyst, 0.2-0.6 part of inhibitor and 0.5-1.5 parts of silicone oil.
The second aspect of the invention provides a preparation method of a carbon fiber electromagnetic shielding material, which comprises the following steps:
s1, adding the modified fiber and the solidified setting material into a double-planet stirrer for stirring and mixing;
s2, forming the mixture prepared in the step S1, and cutting to obtain the product.
Has the advantages that: the carbon fiber electromagnetic shielding material prepared by the invention comprises modified carbon fibers prepared by carbon fiber pretreatment and surface metallization, and further comprises specific filler and matrix resin, so that the surface heat conductivity of the carbon fiber electromagnetic shielding material can be obviously improved through the interaction of the components, and the overall shielding efficiency of the material is effectively improved; the preparation method is simple and convenient, has strong universality and is suitable for large-scale popularization and use.
Detailed Description
The disclosure may be understood more readily by reference to the following detailed description of preferred embodiments of the invention and the examples included therein. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control.
The terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.
When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or as a range of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted to include the ranges "1 to 4", "1 to 3", "1 to 2 and 4 to 5", "1 to 3 and 5", and the like. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.
In addition, the indefinite articles "a" and "an" preceding an element or component of the invention are not intended to limit the number requirement (i.e., the number of occurrences) of the element or component. Thus, "a" or "an" should be read to include one or at least one, and the singular form of an element or component also includes the plural unless the number clearly indicates the singular.
In order to solve the technical problems, the invention provides a carbon fiber electromagnetic shielding material in a first aspect, and the preparation material comprises 20-60 parts by weight of modified carbon fiber and 40-80 parts by weight of a curing and shaping material.
In a preferred embodiment, the preparation material comprises 40 parts of modified carbon fiber and 60 parts of cured setting material by weight.
Modified carbon fiber
In one embodiment, the method for preparing the modified carbon fiber comprises the following steps:
(1) adding carbon fibers into a surface treating agent for pretreatment;
(2) and plating metal on the surface of the carbon fiber.
In a preferred embodiment, the method for preparing the modified carbon fiber comprises the following steps:
(1) carbon fiber pretreatment: adding carbon fibers into a surface treating agent for surface pretreatment;
(2) plating metal on the surface of the carbon fiber: plating metal on the surface of the carbon fiber obtained in the step (1) by chemical plating.
Surface treating agent
In one embodiment, the surface treatment agent is selected from one or more of concentrated sulfuric acid, concentrated nitric acid and aqua regia.
In a preferred embodiment, the surface treatment agent is aqua regia.
The aqua regia is also called as the aqua regia and the nitrohydrochloric acid, is a liquid with strong corrosivity and yellow fog, and is a mixture of concentrated hydrochloric acid (HCl) and concentrated nitric acid (HNO) according to the volume ratio of 3: 1.
Compared with metal materials, the carbon fiber has insufficient conductivity, the carbon fiber is applied to electromagnetic shielding, the chopped carbon fiber is rarely directly applied, and the chopped carbon fiber is mostly applied in the form of carbon fiber fabrics such as carbon fiber cloth, or the carbon fiber is subjected to surface metallization treatment such as nickel plating or silver plating, and the conductivity and the electromagnetic shielding performance of the carbon fiber can be improved through the surface metallization treatment. But the carbon fiber which is not pretreated is easy to have the problems of poor conductivity and low electromagnetic shielding efficiency.
Metallization
In one embodiment, the metallization is selected from one or a combination of copper plating, nickel plating, and chrome plating.
In a preferred embodiment, the metallization is nickel plating.
In a more preferred embodiment, the electroless nickel plating solution comprises: 25-35 g/L nickel sulfate, 25-40 g/L sodium citrate and 20-30 g/L sodium hypophosphite, wherein the chemical plating process conditions are as follows: the temperature is 60-75 ℃, the time is 3-10 min, and the pH value is adjusted to 7.5-8.5 by adopting ammonia water.
In a more preferred embodiment, the electroless nickel plating solution comprises: 28-32 g/L nickel sulfate, 30-35 g/L sodium citrate and 22-28 g/L sodium hypophosphite, wherein the chemical plating process conditions are as follows: the temperature is 60-75 ℃, the time is 5-8 min, and the pH value is adjusted to 7.5-8.5 by adopting ammonia water.
In a more preferred embodiment, the electroless nickel plating solution comprises: 30g/L of nickel sulfate, 32g/L of sodium citrate and 25g/L of sodium hypophosphite, and the chemical plating process conditions are as follows: the temperature is 67 ℃, the time is 6min, and the pH value is adjusted to 8 by adopting ammonia water.
The carbon fiber is a novel reinforced material with excellent performances of light weight, high strength, low expansion coefficient, wear resistance, corrosion resistance and the like, and has wide application in the field of composite materials. The carbon fiber/metal composite material has the advantages of high specific strength, high specific modulus, good toughness and the like, and has wide application prospects in the fields of aerospace, automobiles and the like. However, the wettability and the chemical compatibility of the carbon fiber and the substrate metal piece are poor, and the applicant finds that the nickel sulfate is 25-35 g/L, the sodium citrate is 25-40 g/L and the sodium hypophosphite is 20-30 g/L in experiments, particularly the binding force between a coating and the surface of the carbon fiber can be effectively improved by interaction with the pretreated carbon fiber, uniform electroplating is realized, and the shielding effect is excellent.
The carbon fibers of the present invention may be obtained from commercially available sources including, but not limited to, from the japanese graphite fiber company.
Solidifying and shaping material
In one embodiment, the cured styling material includes a matrix resin and a conductive filler.
In a preferred embodiment, the mass ratio of the matrix resin to the conductive filler is 1: (1-3); more preferably, the mass ratio of the matrix resin to the conductive filler is 1: 2.
matrix resin
In one embodiment, the raw materials for preparing the matrix resin comprise silicone resin, catalyst, inhibitor and silicone oil.
In a preferred embodiment, the base resin is prepared from 10-12 parts by weight of silicone resin, 0.05-0.5 part by weight of catalyst, 0.2-0.6 part by weight of inhibitor and 0.5-1.5 parts by weight of silicone oil.
In a more preferred embodiment, the base resin is prepared from 11 parts by weight of silicone resin, 0.2 parts by weight of catalyst, 0.4 parts by weight of inhibitor, and 1 part by weight of silicone oil.
Silicone resin
In one embodiment, the silicone resin is selected from one or more of vinyl MQ silicone resin, vinyl phenyl silicone resin, vinyl fluorine-containing silicone resin, methyl silicone resin and phenyl silicone resin.
In a preferred embodiment, the silicone resin is a vinyl MQ silicone resin.
In a more preferred embodiment, the vinyl MQ silicone resin has a vinyl content of 1 to 2 wt%, and the ratio of M/Q is in the range of 0.5 to 1.2; more preferably, the vinyl MQ silicon resin has a vinyl content of 1.4 wt% and a ratio of M/Q in the range of 0.8-1.0.
In a more preferred embodiment, the vinyl silicone resin is purchased from Deltay DT-2750, Deltay Silicone technology development, Inc., Guangzhou.
Catalyst and process for preparing same
In one embodiment, the catalyst is a platinum catalyst.
In a preferred embodiment, the platinum content of the platinum catalyst is 4000 to 10000 ppm; more preferably, the platinum content of the platinum catalyst is 4000-9000 ppm; more preferably, the platinum content of the platinum catalyst is 5000 ppm.
In a more preferred embodiment, the platinum catalyst is purchased at 5000ppm from maiden rubber and plastic materials ltd, of eastern guan.
Inhibitors
In one embodiment, the inhibitor is an alkynol inhibitor selected from one or more of methylbutynol, 3, 5-dimethyl-1-hexyn-3-ol, and 1-hexynyl-1-cyclohexanol.
In a preferred embodiment, the inhibitor is methylbutinol.
Silicone oil
In one embodiment, the silicone oil is selected from one or more of amino silicone oil, epoxy modified silicone oil, carboxyl silicone oil, hydroxyl silicone oil, mercapto silicone oil, methyl trifluoro propyl silicone oil, ethyl silicone oil, methyl chlorophenyl silicone oil, phenyl silicone oil, methyl hydrogen-containing silicone oil and methyl ethoxy silicone oil.
In a preferred embodiment, the silicone oil is methyl hydrogen silicone oil.
In a more preferred embodiment, the methyl hydrogen-containing silicone oil has a hydrogen content of 0.1 to 1.2% and a viscosity of 20 to 520mpa.s at 25 ℃; the methyl hydrogen-containing silicone oil has a hydrogen content of 0.1-0.8% and a viscosity of 20-500 mPa.s at 25 ℃.
In a more preferred embodiment, the methyl hydrogen silicone oil is purchased from silicone ltd, jonan dragon city.
The preparation method of the matrix resin comprises the following steps: mixing the silicon resin, the catalyst, the inhibitor and the silicone oil according to the parts by weight.
Conductive filler
In one embodiment, the conductive filler is selected from one or more of graphite, graphene, carbon black, carbon nanotube, diamond, aluminum, silver, gold, and copper.
In a preferred embodiment, the conductive filler comprises carbon black and copper.
In a more preferred embodiment, the mass ratio of carbon black to copper is 1: (0.1 to 0.3); more preferably, the mass ratio of boron nitride to copper is 1: 0.2.
in a more preferred embodiment, the carbon black has a specific surface area of 700 to 1200m2Per kg; the particle size of the copper is 30-40 mu m; more preferably, the specific surface area of the carbon black is 750-1100 m2Per kg; the particle size of the copper is 35 μm.
In a more preferred embodiment, the carbon black is purchased from F900A of tianjingbobo chemical limited; the copper was purchased from patronage service (shanghai) trade limited.
The applicant finds out in the experimental process that the selected specific surface area is 700-1200 m2The conductive filler is metal copper with the particle size of 30-40 mu m/kg, can be uniformly dispersed and not agglomerated on the surface of the carbon fiber, can interact with the modified carbon fiber and the matrix resin, can form a chain type conductive structure, and has excellent shielding efficiency.
The second aspect of the invention provides a preparation method of a carbon fiber electromagnetic shielding material, which comprises the following steps:
s1, adding the modified fiber and the solidified setting material into a double-planet stirrer for stirring and mixing;
s2, forming the mixture prepared in the step S1, and cutting to obtain the product.
In a preferred embodiment, the method for preparing the carbon fiber electromagnetic shielding material comprises the following steps:
s1, adding the modified fiber and the solidified setting material into a double-planet stirrer for stirring and mixing;
s2, the mixture prepared in the step S1 is formed by rolling or extrusion and is cut to obtain the product.
Examples
In order to better understand the above technical solutions, the following detailed descriptions will be provided with reference to specific embodiments. It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and that the insubstantial modifications and adaptations of the present invention by those skilled in the art based on the above disclosure are still within the scope of the present invention. In addition, the starting materials used are all commercially available, unless otherwise specified.
Example 1
The embodiment 1 of the invention provides a carbon fiber electromagnetic shielding material, and the preparation material comprises 40 parts of modified carbon fiber and 60 parts of a curing and shaping material in parts by weight.
The preparation method of the modified carbon fiber comprises the following steps:
(1) carbon fiber pretreatment: adding carbon fibers into a surface treating agent for surface pretreatment;
(2) plating metal on the surface of the carbon fiber: plating metal on the surface of the carbon fiber obtained in the step (1) by chemical plating.
The surface treating agent is aqua regia.
The plating metal is nickel plating.
The chemical plating solution for nickel plating comprises the following components: 30g/L of nickel sulfate, 32g/L of sodium citrate and 25g/L of sodium hypophosphite, and the chemical plating process conditions are as follows: the temperature is 67 ℃, the time is 6min, and the pH value is adjusted to 8 by adopting ammonia water.
The carbon fibers were purchased from japanese graphite fiber company.
The curing and shaping material comprises matrix resin and conductive filler; the mass ratio of the matrix resin to the conductive filler is 1: 2.
the preparation raw materials of the matrix resin comprise, by weight, 11 parts of silicone resin, 0.2 part of catalyst, 0.4 part of inhibitor and 1 part of silicone oil.
The silicone resin is vinyl MQ silicone resin, which is purchased from Deltay DT-2750, Inc., of Deltay Silicone technology development, Guangzhou.
The catalyst is a platinum catalyst and is purchased from 5000PPM of Mitsum rubber and plastic materials Co.
The inhibitor is methylbutinol.
The silicone oil is methyl hydrogen-containing silicone oil which is purchased from Jinan Longcheng organosilicon Co.
The preparation method of the matrix resin comprises the following steps: mixing the silicon resin, the catalyst, the inhibitor and the silicone oil according to the parts by weight.
The conductive filler comprises carbon black and copper; the mass ratio of boron nitride to copper is 1: 0.2.
the carbon black was purchased from F900A of Tianjin Yibo Rui chemical Co., Ltd; the copper was purchased from patronage service (shanghai) trade limited.
The preparation method of the carbon fiber electromagnetic shielding material comprises the following steps:
s1, adding the modified fiber and the solidified setting material into a double-planet stirrer for stirring and mixing;
s2, rolling and forming the mixture prepared in the step S1, and cutting to obtain the product.
Example 2
Embodiment 2 of the present invention provides a carbon fiber electromagnetic shielding material, which is the same as embodiment 1 in specific implementation, and is different in that the preparation method of the modified carbon fiber comprises the following steps:
plating metal on the surface of the carbon fiber: plating metal on the surface of the carbon fiber.
Example 3
Embodiment 3 of the present invention provides a carbon fiber electromagnetic shielding material, which is the same as embodiment 1 in specific implementation manner, except that the mass ratio of carbon black to copper is 1: 2.
example 4
Example 4 of the present invention provides a carbon fiber electromagnetic shielding material, which is similar to example 1 in the embodiment, except that no carbon black is used.
Example 5
Embodiment 5 of the present invention provides a carbon fiber electromagnetic shielding material, which is similar to embodiment 1 in specific implementation but does not contain copper.
Performance testing
1. Thermal conductivity test
The carbon fiber electromagnetic shielding materials prepared in the embodiments 1 to 6 are subjected to a thermal conductivity test according to ASTM D5470, wherein A is recorded when the thermal conductivity is not less than 30W/(m.K); the heat conductivity coefficient is 20-30W/(m.K) (including 20) and is marked as B; the thermal conductivity coefficient is 10-20W/(m.K) (including 10) and is marked as C; the thermal conductivity is < 10W/(mK) and is marked as D.
2. Testing of shielding effectiveness
The carbon fiber electromagnetic shielding materials prepared in the embodiments 1 to 6 were subjected to electromagnetic shielding effectiveness test according to GJB6190-2008 in a vector network analyzer E5071C of Germany, wherein the frequency range of the electromagnetic waves tested was 300 kHz-14 GHz. Wherein, the shielding effectiveness is more than or equal to 125dB and is marked as A; marking as B when the shielding effectiveness is 110-125 dB; the shielding effectiveness is marked as C when the shielding effectiveness is less than or equal to 110 dB.
TABLE 1
Coefficient of thermal conductivity Shielding effectiveness
Example 1 A A
Practice ofExample 2 D C
Example 3 B B
Example 4 C B
Example 5 C B
The foregoing examples are merely illustrative and serve to explain some of the features of the method of the present invention. The appended claims are intended to claim as broad a scope as is contemplated, and the examples presented herein are merely illustrative of selected implementations in accordance with all possible combinations of examples. Accordingly, it is applicants' intention that the appended claims are not to be limited by the choice of examples illustrating features of the invention. Also, where numerical ranges are used in the claims, subranges therein are included, and variations in these ranges are also to be construed as possible being covered by the appended claims.

Claims (10)

1. The carbon fiber electromagnetic shielding material is characterized in that the preparation material comprises 20-60 parts by weight of modified carbon fiber and 40-80 parts by weight of curing and shaping material.
2. The carbon fiber electromagnetic shielding material as claimed in claim 1, wherein the preparation method of the modified carbon fiber comprises the following steps:
(1) adding carbon fibers into a surface treating agent for pretreatment;
(2) and plating metal on the surface of the carbon fiber.
3. The carbon fiber electromagnetic shielding material according to claim 2, wherein the metal plating is selected from one or a combination of copper plating, nickel plating and chrome plating.
4. The carbon fiber electromagnetic shielding material according to claim 3, wherein the electroless nickel plating solution comprises: 25-35 g/L nickel sulfate, 25-40 g/L sodium citrate and 20-30 g/L sodium hypophosphite, wherein the chemical plating process conditions are as follows: the temperature is 60-75 ℃, the time is 3-10 min, and the pH value is adjusted to 7.5-8.5 by adopting ammonia water.
5. The carbon fiber electromagnetic shielding material according to claim 1 or 4, wherein the cured sizing material comprises a matrix resin and a conductive filler.
6. The carbon fiber electromagnetic shielding material according to claim 5, wherein the conductive filler is selected from one or more of graphite, graphene, carbon black, carbon nanotubes, diamond, aluminum, silver, gold and copper.
7. The carbon fiber electromagnetic shielding material of claim 6, wherein the conductive filler comprises carbon black and copper; the mass ratio of the carbon black to the copper is 1: (0.1-0.3).
8. The carbon fiber electromagnetic shielding material as claimed in claim 7, wherein the carbon black has a specific surface area of 700 to 1200m2Per kg; the particle size of the copper is 30-40 mu m.
9. The carbon fiber electromagnetic shielding material as claimed in claim 5, wherein the base resin is prepared from 10 to 12 parts by weight of silicone resin, 0.05 to 0.5 part by weight of catalyst, 0.2 to 0.6 part by weight of inhibitor, and 0.5 to 1.5 parts by weight of silicone oil.
10. The method for preparing the carbon fiber electromagnetic shielding material according to any one of claims 1 to 9, comprising the following steps:
s1, adding the modified fiber and the solidified setting material into a double-planet stirrer for stirring and mixing;
s2, forming the mixture prepared in the step S1, and cutting to obtain the product.
CN202011604262.0A 2020-12-30 2020-12-30 Carbon fiber electromagnetic shielding material and preparation method thereof Pending CN112724687A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104448840A (en) * 2015-01-19 2015-03-25 中国科学院长春应用化学研究所 Preparation method of filing type electromagnetic shielding silicon rubber
CN106700249A (en) * 2016-12-06 2017-05-24 东莞职业技术学院 Carbon nanotube modified polypropylene composite material and preparation method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104448840A (en) * 2015-01-19 2015-03-25 中国科学院长春应用化学研究所 Preparation method of filing type electromagnetic shielding silicon rubber
CN106700249A (en) * 2016-12-06 2017-05-24 东莞职业技术学院 Carbon nanotube modified polypropylene composite material and preparation method thereof

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
"中国专利信息", 《电镀与涂饰》 *
朱洪法 主编: "《催化剂手册》", 31 August 2008 *
李忠等: "负载型Ni-Co-P/CNFs催化剂的制备及释氢性能", 《燃料化学学报》 *

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Application publication date: 20210430