CN118206864A - Carbon nano paper composite material for electromagnetic shielding and preparation method and application thereof - Google Patents
Carbon nano paper composite material for electromagnetic shielding and preparation method and application thereof Download PDFInfo
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- CN118206864A CN118206864A CN202410316885.XA CN202410316885A CN118206864A CN 118206864 A CN118206864 A CN 118206864A CN 202410316885 A CN202410316885 A CN 202410316885A CN 118206864 A CN118206864 A CN 118206864A
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- 239000002131 composite material Substances 0.000 title claims abstract description 76
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 51
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 229920005989 resin Polymers 0.000 claims abstract description 62
- 239000011347 resin Substances 0.000 claims abstract description 62
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 238000002791 soaking Methods 0.000 claims abstract description 5
- CXQXSVUQTKDNFP-UHFFFAOYSA-N octamethyltrisiloxane Chemical compound C[Si](C)(C)O[Si](C)(C)O[Si](C)(C)C CXQXSVUQTKDNFP-UHFFFAOYSA-N 0.000 claims description 20
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 19
- 235000013870 dimethyl polysiloxane Nutrition 0.000 claims description 19
- 238000004987 plasma desorption mass spectroscopy Methods 0.000 claims description 19
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 19
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 10
- 239000008367 deionised water Substances 0.000 claims description 9
- 229910021641 deionized water Inorganic materials 0.000 claims description 9
- 239000012528 membrane Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000002041 carbon nanotube Substances 0.000 claims description 8
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 8
- 239000002390 adhesive tape Substances 0.000 claims description 6
- 229910021389 graphene Inorganic materials 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000002048 multi walled nanotube Substances 0.000 claims 1
- 239000002109 single walled nanotube Substances 0.000 claims 1
- 239000002105 nanoparticle Substances 0.000 abstract description 6
- 238000000576 coating method Methods 0.000 abstract description 5
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 9
- 239000002134 carbon nanofiber Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 229910021393 carbon nanotube Inorganic materials 0.000 description 6
- 239000004814 polyurethane Substances 0.000 description 6
- 239000002245 particle Substances 0.000 description 5
- 229920002635 polyurethane Polymers 0.000 description 5
- 239000004593 Epoxy Substances 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 229920001940 conductive polymer Polymers 0.000 description 3
- HIBWGGKDGCBPTA-UHFFFAOYSA-N C=CC1=CC=CC=C1.C=CC1=CC=CC=C1 Chemical compound C=CC1=CC=CC=C1.C=CC1=CC=CC=C1 HIBWGGKDGCBPTA-UHFFFAOYSA-N 0.000 description 2
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 2
- 239000003575 carbonaceous material Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001938 differential scanning calorimetry curve Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical class C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 229920000909 polytetrahydrofuran Polymers 0.000 description 2
- 238000000518 rheometry Methods 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 208000032365 Electromagnetic interference Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000010290 biphenyl Nutrition 0.000 description 1
- 239000004305 biphenyl Substances 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000000383 hazardous chemical Substances 0.000 description 1
- 231100000206 health hazard Toxicity 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N phenylbenzene Natural products C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000307 polymer substrate Polymers 0.000 description 1
- 239000002952 polymeric resin Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Landscapes
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention belongs to the technical field of electromagnetic shielding coatings, and discloses a carbon nano paper composite material for electromagnetic shielding and a preparation method and application thereof; the method includes preparing carbon nanopaper; adding Fe 3O4 with the mass fraction of less than or equal to 8% and styrene with the mass fraction of less than or equal to 15% into unpolymerized resin, and stirring; placing the carbon nano paper in a resin/Fe 3O4 solution, soaking for 10-30 minutes at the temperature of 30-60 ℃, removing redundant resin on the surface of the composite material, and placing the composite material in a 120-150 ℃ oven for 12 hours to completely polymerize to obtain the carbon nano paper composite material; compared with the composite material for electromagnetic shielding prepared by direct stirring, the invention not only improves the mass ratio of the carbon-based nano particles, but also obtains better electromagnetic shielding performance; meanwhile, compared with a composite material prepared by adopting resin-impregnated carbon nano paper, the composite material prepared by the invention has better electromagnetic shielding performance.
Description
Technical Field
The invention belongs to the technical field of electromagnetic shielding coatings, and particularly relates to a carbon nano paper composite material for electromagnetic shielding and a preparation method and application thereof.
Background
High density integration of electronic devices typically induces electromagnetic interference by containing a large amount of unwanted radiated signals. These electromagnetic interferences may reduce the accuracy of the communication system and compromise the security of the electronic equipment and may cause health hazards. The use of electromagnetic waves of greater power and higher frequencies has exacerbated the hazards of electromagnetic interference in recent years.
Industry typically exploits the properties of metals and conductive polymers to reflect or absorb incident electromagnetic waves to attenuate electromagnetic interference. Although metals or materials with metal coatings generally exhibit high electromagnetic shielding effectiveness (up to 100 dB), the inherent drawbacks of high metal density, susceptibility to corrosion, poor absorption of electromagnetic waves, etc. limit their use in complex and corrosive environments. For example, the overall performance and reliability of the device or system may be affected by non-linear rust bolting effects, particularly in marine environments. Thus, instead, conductive polymer composites are widely used in electromagnetic shielding scenarios.
Conductive polymer composites typically have a polymer as the substrate and a conductive material as the filler. In order to impart sufficient conductivity to polymer composites, carbon-based nanoparticles are widely used in the industry as electrical reinforcing materials for various types of polymer substrates because carbon-based nanoparticles have a low permeation threshold, and therefore a small amount or small amount of carbon-based nanoparticles can impart sufficient conductivity to the composites. But unsuitable dispersion methods would increase the required penetration threshold, thereby significantly reducing the electromagnetic shielding properties and increasing the cost of the composite. Among the various types of carbon-based nanoparticles, high aspect ratios impart higher electromagnetic shielding properties (carbon nanotubes > carbon nanofibers > carbon black) to the material. However, since Carbon Nanotubes (CNTs) have a large specific surface area (-1500 m 2/g), it is not easy to obtain uniformly dispersed CNTs in a polymer resin, especially at high concentrations (typically >5 wt.%) which limits the electromagnetic shielding performance. Meanwhile, uneven dispersion of the CNTs may also cause aggregation of the CNTs, thereby reducing mechanical properties of the composite material. The mass fraction of CNT in the currently prevailing polymer/CNT composites is more than 5 wt.%.
Technical Feasibility of a Thermally Activated Nanotape for Electromagnetic Interference Applications;Journals;J.Compos.Sci.;Volume 7;Issue 8 The method is disclosed that the CNT nano paper is prepared by dispersing the CNT, and then the resin is soaked into the nano paper, so that the content of the CNT can be improved to about 15%, and a coating with high electromagnetic shielding performance is obtained. Although a coating having a stronger electromagnetic shielding property can be obtained by impregnating the CNT with the resin, since the selection of the resin does not significantly affect the electromagnetic shielding property, other improved methods are sought to obtain a better electromagnetic shielding property.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a carbon nano paper composite material for electromagnetic shielding and a preparation method and application thereof.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
In a first aspect, the present invention provides a method for preparing a carbon nano paper composite for electromagnetic shielding, the method comprising the steps of:
step 1, preparing carbon nano paper;
Step 2, adding Fe 3O4 with the mass fraction of less than or equal to 8% and styrene with the mass fraction of less than or equal to 15% into unpolymerized resin, and stirring for 10-30 minutes at the temperature of between room temperature and 50 ℃ to obtain a resin/Fe 3O4 solution;
And 3, placing the carbon nano paper in a resin/Fe 3O4 solution, soaking for 10-30 minutes at the temperature of 30-60 ℃, removing excessive resin on the surface of the composite material, and placing the composite material in a baking oven at 120-150 ℃ for 12 hours to completely polymerize to obtain the carbon nano paper composite material.
Further, the specific steps for preparing the carbon nano paper in the step 1 are as follows: firstly, CNT, CNF or graphene and sodium dodecyl sulfate are mixed according to a mass ratio of 1:1-1:5 adding the mixture into deionized water, and performing ultrasonic dispersion for 1-5 hours; and then filtering the uniformly dispersed solution through a filter membrane, and drying the solution in an oven for 12 to 24 hours to obtain the carbon nano paper. The CNTs include SWCNT single-arm carbon tubes and MWCNT multi-arm carbon tubes. Because the CNF carbon fiber, graphene and other carbon materials have similar performance to CNTs, the conductive part of the composite material related to the method also comprises CNF, graphene and other carbon materials.
The thickness of the carbon nano paper is 50-300 microns.
The resin comprises PU and PDMS. In the composite material, the non-conductive resin only provides structural support, but does not affect the electromagnetic shielding performance, so that the corresponding resin can be selected according to the product requirement, and the resin type related to the method is not limited to PU, PDMS, epoxy and other commercial resins.
Further, the unpolymerized resin satisfies a viscosity of less than 1 Pa.s after addition of Fe 3O4 and styrene.
In a second aspect, the present invention provides the use of a carbon nanopaper composite material obtainable by the process of claim 1; the carbon nano paper composite material is directly used for the surface of an electromagnetic shielding device or an adhesive tape for manufacturing electromagnetic shielding is adhered to the surface of the device.
The invention has the following beneficial effects: 1. compared with the composite material for electromagnetic shielding prepared by direct stirring in the prior art, the invention not only improves the mass ratio of the carbon-based nano particles, but also obtains better electromagnetic shielding performance; meanwhile, compared with the composite material prepared by using resin to infiltrate carbon nano paper in the prior art, the invention improves the resin through Fe 3O4 and prepares the carbon nano paper composite material so as to improve the electromagnetic shielding performance.
2. According to the invention, the fluidity of the resin containing Fe 3O4 is improved through styrene (styrene), so that the resin can be soaked in the carbon nano paper at low temperature. Although the fluidity of the resin can be improved along with the temperature rise, the high temperature can accelerate the polymerization reaction of the resin at the same time, and the method can ensure that the resin is well soaked in the carbon nano paper, thereby avoiding the defect of low mechanical property of the composite material caused by insufficient soaking.
Drawings
FIG. 1 is a graph showing the rheology of the resin obtained in example 3 and the resin obtained in comparative example 2 at different temperatures;
FIG. 2 is a DSC curve of the composite of comparative example 1 at various temperatures;
FIG. 3 is a scanning electron microscope image of the composite material prepared in example 3;
fig. 4 is a graph comparing electromagnetic shielding performance of the composites prepared in examples 2 to 4 with that of the composite prepared in comparative example 1.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to be limiting.
Example 1:
SWCNT (single-arm carbon tube) and Sodium Dodecyl Sulfate (SDS) were first mixed in a mass ratio of 1:5 proportion is added into deionized water, and ultrasonic dispersion is carried out for 5 hours. The uniformly dispersed solution was then suction filtered through a filter membrane and dried in an oven for 12 hours to obtain CNT nanopaper with a thickness of 50 μm. Ferroferric oxide (particle size less than 20 nm) with a mass fraction of 8% and Styrene (Styrne) with a mass fraction of 12% were added to unpolymerized Polyurethane (PU) resin (PU was polymerized by Polytetrahydrofuran (PTHF), 1,4Butanediol (BD), 4,4Methylene diphenyl diisocyanate (MDI), in this case polyol: BD: MDI ratio 4:1:5) with stirring at 40℃for 10 minutes.
The CNT nano paper is soaked in the resin for 10 minutes at 50 ℃, and after the redundant resin on the surface of the composite material is removed by a scraper, the PU/SWCNT/Fe 3O4 composite material is placed in a baking oven at 150 ℃ for 12 hours to be completely polymerized.
Application: 1. the composite material may be adhered to the surface of a device requiring electromagnetic shielding (most of the polymer composite materials) by a resin or an adhesive tape or the like.
2. After removing the superfluous resin on the surface of the composite material by using a scraper, the PU/MWCNT/Fe 3O4 composite material is subjected to 5min at 100 ℃ to prepare the electromagnetic shielding adhesive tape directly adhered to the surface of the device.
Example 2:
MWCNT (multi-arm carbon tube) and SDS were first mixed in a mass ratio of 1:4 proportion is added into deionized water, and ultrasonic dispersion is carried out for 2 hours. The uniformly dispersed solution was then suction filtered through a filter membrane and dried in an oven for 24 hours to obtain CNT nanopaper with a thickness of 50 μm. 3% by mass of ferroferric oxide (particle diameter less than 20 nm) and 2% by mass of Styrene (Styrne) were added to the unpolymerized PDMS resin, and stirred at room temperature for 30 minutes.
The CNT nano paper is soaked in the resin for 10 minutes at 40 ℃, and after the redundant resin on the surface of the composite material is removed by a scraper, the PDMS/MWCNT/Fe 3O4 composite material is placed in a baking oven at 120 ℃ for 12 hours to be completely polymerized.
Example 3:
MWCNT (multi-arm carbon tube) and SDS were first mixed in a mass ratio of 1:4 proportion is added into deionized water, and ultrasonic dispersion is carried out for 2 hours. The uniformly dispersed solution was then suction filtered through a filter membrane and dried in an oven for 24 hours to obtain CNT nanopaper with a thickness of 50 μm. To the unpolymerized PDMS resin was added 5% by mass of ferroferric oxide and 5% by mass of Styrene (Styrene) having a particle size of less than 20nm, and stirred at 40℃for 30 minutes.
The CNT nanopaper was immersed in the resin at 50 ℃ for 10 minutes, and after removing the excess resin from the surface of the composite with a doctor blade, the PDMS/MWCNT/Fe 3O4 composite was placed in a 120 ℃ oven for 12 hours to completely polymerize.
FIG. 3 is a scanning electron microscope image of a fully cured PDMS/MWCNT/Fe 3O4 composite showing that the PDMS/Fe 3O4 resin is fully impregnated in the CNT.
Example 4:
First, MWCNT and SDS are mixed according to a mass ratio of 1:4 proportion is added into deionized water, and ultrasonic dispersion is carried out for 2 hours. The uniformly dispersed solution was then suction filtered through a filter membrane and dried in an oven for 24 hours to obtain CNT nanopaper with a thickness of 50 μm. Ferroferric oxide with the mass fraction of 8% and Styrene (Styrene) with the mass fraction of 10% are added into unpolymerized PDMS resin, and stirred for 20 minutes at 50 ℃.
The CNT nanopaper was immersed in the resin at 60 ℃ for 10 minutes, and after removing the excess resin from the surface of the composite with a doctor blade, the PDMS/MWCNT/Fe 3O4 composite was placed in a 120 ℃ oven for 12 hours to completely polymerize.
Example 5:
Firstly, CNF and SDS are mixed according to a mass ratio of 1:1 proportion is added into deionized water, and ultrasonic dispersion is carried out for 3 hours. The uniformly dispersed solution was then suction filtered through a filter membrane and dried in an oven for 24 hours to obtain CNT nanopaper with a thickness of 80 μm. Styrene (Styrne) having a particle size of less than 20nm and a mass fraction of 2% and 3% of ferroferric oxide was added to the unpolymerized PDMS resin, and stirred at room temperature for 30 minutes.
After the CNF nano paper is soaked in the resin for 10 minutes at 40 ℃, and the excessive resin on the surface of the composite material is removed by using a scraper, the PDMS/CNF/Fe 3O4 composite material is placed in a baking oven at 120 ℃ for 12 hours to be completely polymerized.
The applications of examples 2-5 are identical: 1. the composite material can be adhered to the surface of a device requiring electromagnetic shielding (advantage can be related to the human body) by resin or adhesive tape or the like.
2. After removing the excess resin from the surface of the composite with a doctor blade, the PDMS/MWCNT/Fe 3O4 composite was subjected to a temperature of 90 ℃ for 5min to prepare an electromagnetic shielding tape (which may also be used to shield each other between circuits in a complex circuit) directly adhered to the surface of the device.
Example 6:
First, MWCNT and SDS are mixed according to a mass ratio of 1:3 are added into deionized water in proportion, and are dispersed for 3 hours by ultrasonic. The uniformly dispersed solution was then suction filtered through a filter membrane and dried in an oven for 24 hours to obtain MWCNT nanopaper with a thickness of 50 μm. Styrene (Styrne) having a particle size of less than 20nm and a mass fraction of 5% of 3% of ferroferric oxide was added to the unpolymerized Epoxy resin and stirred at 40℃for 20 minutes.
After the CNF nanopaper was immersed in the resin at 50 ℃ for 10 minutes and the excess resin on the surface of the composite was removed with a doctor blade, the Epoxy/MWCNT/Fe 3O4 composite was placed in a 140 ℃ oven for 12 hours to completely polymerize.
Application: 1. the composite material may be adhered to the surface of a device requiring electromagnetic shielding by means of a resin or an adhesive tape or the like.
2. After removing the excess resin from the composite surface with a doctor blade, the Epoxy/MWCNT/Fe 3O4 composite was left at 90 ℃ for 5min to prepare an electromagnetic shielding tape (if metallic, an additional Epoxy layer is needed to ensure non-conduction between each other) that was directly adhered to the device (more generic, which may be metallic) surface.
Comparative example 1:
MWCNT (multi-arm carbon tube) and SDS were first mixed in a mass ratio of 1:4 proportion is added into deionized water, and ultrasonic dispersion is carried out for 2 hours. The uniformly dispersed solution was then suction filtered through a filter membrane and dried in an oven for 24 hours to obtain CNT nanopaper with a thickness of 50 μm.
And soaking the CNT nano paper in PDMS resin for 10 minutes at normal temperature, removing redundant resin on the surface of the composite material by using a scraper, and then placing the PDMS/MWCNT composite material in a baking oven at 120 ℃ for 12 hours to completely polymerize.
FIG. 2 is a DSC curve of the composite of comparative example 1 at different temperatures showing the cure time required for PDMS/CNT composites at different temperatures.
Fig. 4 is a graph showing the electromagnetic shielding performance results of the composite materials prepared in examples 2 to 4 and the composite material prepared in comparative example 1, and it can be seen from the graph that the electromagnetic shielding performance of the composite material obtained without the resin treated with ferroferric oxide is far lower than that of the composite material obtained by the preparation method of the present invention, and the electromagnetic shielding performance of the composite material obtained by the resin treated with ferroferric oxide with a mass fraction of 8% is optimal.
Comparative example 2:
the 5% by mass of ferroferric oxide was added to the unpolymerized PDMS resin and stirred at 40 ℃ for 30 minutes.
FIG. 1 is a graph of the rheology of PDMS/Fe 3O4 resin (Fe 3O4 mass ratio 5%) at various temperatures before and after treatment with styrene, showing that the viscosity of the PDMS resin containing Fe 3O4 is reduced after the use of styrene and wetting can be achieved below 40 ℃.
The foregoing has outlined and described the basic principles, features, and advantages of the present invention. However, the foregoing is merely specific examples of the present invention, and the technical features of the present invention are not limited thereto, and any other embodiments that are derived by those skilled in the art without departing from the technical solution of the present invention are included in the scope of the present invention.
Claims (7)
1. A method for preparing a carbon nano paper composite material for electromagnetic shielding, which is characterized by comprising the following steps:
step 1, preparing carbon nano paper;
Step 2, adding Fe 3O4 with the mass fraction of less than or equal to 8% and styrene with the mass fraction of less than or equal to 15% into unpolymerized resin, and stirring for 10-30 minutes at the temperature of between room temperature and 50 ℃ to obtain a resin/Fe 3O4 solution;
And 3, placing the carbon nano paper in a resin/Fe 3O4 solution, soaking for 10-30 minutes at the temperature of 30-60 ℃, removing excessive resin on the surface of the composite material, and placing the composite material in a baking oven at 120-150 ℃ for 12 hours to completely polymerize to obtain the carbon nano paper composite material.
2. The method for preparing a carbon nano paper composite material for electromagnetic shielding according to claim 1, wherein the specific steps for preparing the carbon nano paper in the step 1 are as follows: firstly, CNT, CNF or graphene and sodium dodecyl sulfate are mixed according to a mass ratio of 1:1-1:5 adding the mixture into deionized water, and performing ultrasonic dispersion for 1-5 hours; and then filtering the uniformly dispersed solution through a filter membrane, and drying the solution in an oven for 12 to 24 hours to obtain the carbon nano paper.
3. The method of preparing a carbon nano-paper composite for electromagnetic shielding according to claim 2, wherein the CNTs include SWCNT single-arm carbon tubes, MWCNT multi-arm carbon tubes.
4. The method for preparing a carbon nano paper composite material for electromagnetic shielding according to claim 2, wherein the thickness of the carbon nano paper is 50-300 micrometers.
5. The method for preparing the carbon nano paper composite material for electromagnetic shielding according to claim 1, wherein the resin comprises PU and PDMS.
6. The method for preparing a carbon nano paper composite material for electromagnetic shielding according to claim 1, wherein the unpolymerized resin satisfies a viscosity of less than 1 Pa-s after adding Fe 3O4 and styrene.
7. An application of the carbon nano paper composite material, which is characterized in that the carbon nano paper composite material is prepared by the method of claim 1; the carbon nano paper composite material is directly used for the surface of an electromagnetic shielding device or an adhesive tape for manufacturing electromagnetic shielding is adhered to the surface of the device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410316885.XA CN118206864A (en) | 2024-03-20 | 2024-03-20 | Carbon nano paper composite material for electromagnetic shielding and preparation method and application thereof |
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