CN117777593A - High-conductivity electromagnetic shielding material and preparation method thereof - Google Patents
High-conductivity electromagnetic shielding material and preparation method thereof Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 97
- 238000002360 preparation method Methods 0.000 title claims abstract description 32
- -1 polypropylene Polymers 0.000 claims abstract description 42
- 239000004743 Polypropylene Substances 0.000 claims abstract description 39
- 229920001155 polypropylene Polymers 0.000 claims abstract description 39
- 239000002994 raw material Substances 0.000 claims abstract description 35
- 239000002131 composite material Substances 0.000 claims abstract description 28
- 229920002379 silicone rubber Polymers 0.000 claims abstract description 21
- 239000004945 silicone rubber Substances 0.000 claims abstract description 21
- 238000005520 cutting process Methods 0.000 claims abstract description 18
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000003063 flame retardant Substances 0.000 claims abstract description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 14
- 239000004917 carbon fiber Substances 0.000 claims abstract description 14
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 14
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 14
- 239000010439 graphite Substances 0.000 claims abstract description 14
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 238000013461 design Methods 0.000 claims abstract description 3
- 239000000203 mixture Substances 0.000 claims abstract description 3
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- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 10
- 239000012752 auxiliary agent Substances 0.000 claims description 10
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 238000000151 deposition Methods 0.000 claims description 8
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- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 4
- 229910052791 calcium Inorganic materials 0.000 claims description 4
- 239000011575 calcium Substances 0.000 claims description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 4
- 229920005560 fluorosilicone rubber Polymers 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 229910000480 nickel oxide Inorganic materials 0.000 claims description 4
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 claims description 4
- MQRWBMAEBQOWAF-UHFFFAOYSA-N acetic acid;nickel Chemical compound [Ni].CC(O)=O.CC(O)=O MQRWBMAEBQOWAF-UHFFFAOYSA-N 0.000 claims description 3
- VNWKTOKETHGBQD-YPZZEJLDSA-N carbane Chemical group [10CH4] VNWKTOKETHGBQD-YPZZEJLDSA-N 0.000 claims description 3
- 229940078494 nickel acetate Drugs 0.000 claims description 3
- BFDHFSHZJLFAMC-UHFFFAOYSA-L nickel(ii) hydroxide Chemical compound [OH-].[OH-].[Ni+2] BFDHFSHZJLFAMC-UHFFFAOYSA-L 0.000 claims description 3
- 150000002825 nitriles Chemical class 0.000 claims description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 2
- 239000000292 calcium oxide Substances 0.000 claims description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 2
- PVFSDGKDKFSOTB-UHFFFAOYSA-K iron(3+);triacetate Chemical compound [Fe+3].CC([O-])=O.CC([O-])=O.CC([O-])=O PVFSDGKDKFSOTB-UHFFFAOYSA-K 0.000 claims description 2
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- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-IGMARMGPSA-N Carbon-12 Chemical group [12C] OKTJSMMVPCPJKN-IGMARMGPSA-N 0.000 description 1
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- HIHIPCDUFKZOSL-UHFFFAOYSA-N ethenyl(methyl)silicon Chemical compound C[Si]C=C HIHIPCDUFKZOSL-UHFFFAOYSA-N 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
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- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention relates to the technical field of electromagnetic shielding composite material preparation, in particular to a high-conductivity electromagnetic shielding material which comprises the following raw materials in parts by mass: 40-60 parts of polypropylene, 15-20 parts of graphite, 5-10 parts of tackifier, 5-10 parts of vulcanizing agent, 10-20 parts of flame retardant, 10-20 parts of carbon fiber and 10-20 parts of silicone rubber. The high-conductivity electromagnetic shielding material is prepared by mixing polypropylene, graphite, tackifier, vulcanizing agent, flame retardant, carbon fiber and silicone rubber according to the proportion, and preforming the mixture into a required design shape of a product. The electromagnetic shielding material with high conductivity and the preparation method thereof can be used for preparing excellent electromagnetic shielding materials, the traditional electromagnetic materials are subjected to layered thin cutting, and the three-layer patch technology is utilized, so that the prepared electromagnetic material has extremely high physical properties, namely structural strength, on one hand, the conductivity of the material is reduced, the electromagnetic shielding effect is improved, and meanwhile, the electromagnetic material can be cut according to the required size.
Description
Technical Field
The invention relates to the technical field of electromagnetic shielding composite material preparation, in particular to a high-conductivity electromagnetic shielding material and a preparation method thereof.
Background
With the development of modern high and new technology, electromagnetic interference (EMI) and electromagnetic compatibility (EMC) caused by electromagnetic waves are increasingly serious, so that not only are interference and damage to electronic instruments and equipment caused, normal T work of the electronic instruments and equipment affected, but also the international competitiveness of electronic products and equipment in China is severely restricted, and the environment is polluted and the health of human beings is endangered; in addition, electromagnetic wave leakage can endanger national information security and security of military core confidentiality. In particular, electromagnetic pulse weapons which are new concept weapons have made substantial breakthroughs, can directly strike electronic instruments and equipment, electric power systems and the like, cause temporary failure or permanent damage of information systems and the like, have various delivery modes and extremely strong destructive power, and can cause damage to human bodies by strong electromagnetic pulses, so that human nerves are disordered, behaviors are out of control and the like. Therefore, the method searches for high-efficiency electromagnetic shielding materials, prevents electromagnetic interference and electromagnetic compatibility caused by electromagnetic waves, and has important significance for improving the safety and reliability of electronic products and equipment, improving the international competitiveness, preventing the striking of electromagnetic pulse weapons and ensuring the safety and smoothness of information communication systems, network systems, transmission systems, weapon platforms and the like. In view of the important roles of electromagnetic shielding materials in social life, economic construction and national defense construction, the development of the electromagnetic shielding materials is becoming an important subject of attention.
However, the existing electromagnetic shielding composite material still has the problems of poor material shielding effect caused by lower flame retardant effect and higher conductivity, so we propose a high-conductivity high-flame-retardance polypropylene electromagnetic shielding composite material and a preparation method thereof for solving the problems.
Disclosure of Invention
The invention aims to provide a high-conductivity electromagnetic shielding material and a preparation method thereof, which are used for solving the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the high-conductivity electromagnetic shielding material comprises the following raw materials in parts by mass: 40-60 parts of polypropylene, 15-20 parts of graphite, 5-10 parts of tackifier, 5-10 parts of vulcanizing agent, 10-20 parts of flame retardant, 10-20 parts of carbon fiber and 10-20 parts of silicone rubber.
Preferably, the highly conductive electromagnetic shielding material is prepared by mixing polypropylene, graphite, tackifier, vulcanizing agent, flame retardant, carbon fiber, and silicone rubber in the proportions and preforming the mixture into the desired design shape of the product.
Preferably, the silicone rubber is one or more of methyl silicone rubber, methyl vinyl phenyl silicone rubber, nitrile silicone rubber and fluoro silicone rubber.
The preparation method of the high-conductivity electromagnetic shielding material comprises the following steps:
s1: material preparation: selecting polypropylene, graphite, tackifier, vulcanizing agent, flame retardant, carbon fiber and silicone rubber as raw materials for preparation by professionals, and treating the selected raw materials;
s2: material processing, namely placing half of the raw materials prepared in the step S1 into a stirrer for stirring, placing the materials into a high-temperature melting furnace for mixed heating, placing the other half of the materials into a container, and adding a cross-linking agent and an auxiliary agent to enable the AS resin and the filler to generate chemical reaction so AS to form a grid structure;
s3: granulating the product heated and formed in the step S2, extruding and forming the granulated material, and preparing a polypropylene electromagnetic shielding composite material;
s4: carrying out surface treatment on the polypropylene electromagnetic shielding composite material prepared in the step S3, and carrying out laser cutting to form a sheet with the thickness of 0.3-0.5 microns;
s5: carrying out laser slicing on the grid structure prepared in the step S2, wherein the slicing thickness is 0.2-0.4 microns;
s6: preparing high-conductivity electromagnetic shielding materials, namely two polypropylene electromagnetic shielding composite materials in slices, clamping a grid structure in the middle, bonding at high temperature to form a high-conductivity electromagnetic shielding material film, and cutting into specified sizes according to requirements.
Preferably, in the step S3, the raw materials are heated and completely melted in the step S2, and then fully and uniformly mixed.
Preferably, the auxiliary agent comprises: one or more of nickel-based, iron-based, and calcium-based compounds.
Preferably, the nickel-based or iron-based compound is: nickel oxide or nickel hydroxide or nickel acetate or iron oxide or iron acetate or iron oxide; the calcium-based compound is calcium oxide or calcium carbonate.
Preferably, in the step S6, after the predetermined size obtained after the cutting is prepared, it is further required to deposit the predetermined size by an electrochemical method, so that the metal particles are coated on the outer surface of the metal particles under the deposition for 1-10 hours, and a continuous metal layer is formed, thereby obtaining the final high-conductivity electromagnetic shielding material film.
Compared with the prior art, the invention has the beneficial effects that:
the electromagnetic shielding material with high conductivity and the preparation method thereof can be used for preparing excellent electromagnetic shielding materials, the traditional electromagnetic materials are subjected to layered thin cutting, and the three-layer patch technology is utilized, so that the prepared electromagnetic material has extremely high physical properties, namely structural strength, on one hand, the conductivity of the material is reduced, the electromagnetic shielding effect is improved, and meanwhile, the electromagnetic material can be cut according to the required size.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The preparation method of the high-conductivity electromagnetic shielding material comprises the following steps:
s1: material preparation: selecting 40 parts of polypropylene, 15 parts of graphite, 5 parts of tackifier, 5 parts of vulcanizing agent, 10 parts of flame retardant, 10 parts of carbon fiber and 10 parts of methyl silicone rubber as raw materials for preparation by professionals, and treating the selected raw materials;
s2: material processing, namely placing half of the raw materials prepared in the step S1 into a stirrer for stirring, placing the materials into a high-temperature melting furnace for mixed heating, placing the other half of the materials into a container, adding a cross-linking agent and nickel oxide AS auxiliary agents, and enabling AS resin and filler to generate chemical reaction to form a grid structure;
s3: granulating the product heated and formed in the step S2, extruding and forming the granulated material, and preparing the polypropylene electromagnetic shielding composite material, wherein the raw materials are heated in the step S2 and form a completely molten state during extrusion, and fully and uniformly mixing;
s4: carrying out surface treatment on the polypropylene electromagnetic shielding composite material prepared in the step S3, and carrying out laser cutting to form a sheet with the thickness of 0.3-0.5 microns;
s5: carrying out laser slicing on the grid structure prepared in the step S2, wherein the slicing thickness is 0.2-0.4 microns;
s6: preparing high-conductivity electromagnetic shielding materials, namely two sliced polypropylene electromagnetic shielding composite materials, clamping a grid structure in the middle, bonding at high temperature to form a high-conductivity electromagnetic shielding material film, and cutting into specified sizes according to requirements;
in the step S6, after the specified size obtained after cutting is prepared, electrochemical deposition is carried out on the metal particles, so that the metal particles are coated on the outer surface of the metal particles under the deposition for 1-10 hours to form a continuous metal layer, and a final high-conductivity electromagnetic shielding material film is obtained.
Example two
The preparation method of the high-conductivity electromagnetic shielding material comprises the following steps:
s1: material preparation: selecting 43 parts of polypropylene, 16 parts of graphite, 6 parts of tackifier, 6 parts of vulcanizing agent, 12 parts of flame retardant, 12 parts of carbon fiber and 12 parts of methyl vinyl silicone rubber as raw materials for preparation by a professional, and treating the selected raw materials;
s2: material processing, namely placing half of the raw materials prepared in the step S1 into a stirrer for stirring, placing the materials into a high-temperature melting furnace for mixed heating, placing the other half of the materials into a container, adding a cross-linking agent and ferric oxide AS auxiliary agents, and enabling AS resin and filler to generate chemical reaction to form a grid structure;
s3: granulating the product heated and formed in the step S2, extruding and forming the granulated material, and preparing the polypropylene electromagnetic shielding composite material, wherein the raw materials are heated in the step S2 and form a completely molten state during extrusion, and fully and uniformly mixing;
s4: carrying out surface treatment on the polypropylene electromagnetic shielding composite material prepared in the step S3, and carrying out laser cutting to form a sheet with the thickness of 0.3-0.5 microns;
s5: carrying out laser slicing on the grid structure prepared in the step S2, wherein the slicing thickness is 0.2-0.4 microns;
s6: preparing high-conductivity electromagnetic shielding materials, namely two sliced polypropylene electromagnetic shielding composite materials, clamping a grid structure in the middle, bonding at high temperature to form a high-conductivity electromagnetic shielding material film, and cutting into specified sizes according to requirements;
in the step S6, after the specified size obtained after cutting is prepared, electrochemical deposition is carried out on the metal particles, so that the metal particles are coated on the outer surface of the metal particles under the deposition for 1-10 hours to form a continuous metal layer, and a final high-conductivity electromagnetic shielding material film is obtained.
Example III
The preparation method of the high-conductivity electromagnetic shielding material comprises the following steps:
s1: material preparation: selecting 45 parts of polypropylene, 17 parts of graphite, 7 parts of tackifier, 7 parts of vulcanizing agent, 14 parts of flame retardant, 14 parts of carbon fiber and 14 parts of methyl vinyl phenyl silicone rubber as raw materials for preparation by a professional, and treating the selected raw materials;
s2: material processing, namely placing half of the raw materials prepared in the step S1 into a stirrer for stirring, placing the materials into a high-temperature melting furnace for mixed heating, placing the other half of the materials into a container, adding calcium carbonate AS an auxiliary agent, and enabling AS resin and filler to generate chemical reaction to form a grid structure;
s3: granulating the product heated and formed in the step S2, extruding and forming the granulated material, and preparing the polypropylene electromagnetic shielding composite material, wherein the raw materials are heated in the step S2 and form a completely molten state during extrusion, and fully and uniformly mixing;
s4: carrying out surface treatment on the polypropylene electromagnetic shielding composite material prepared in the step S3, and carrying out laser cutting to form a sheet with the thickness of 0.3-0.5 microns;
s5: carrying out laser slicing on the grid structure prepared in the step S2, wherein the slicing thickness is 0.2-0.4 microns;
s6: preparing high-conductivity electromagnetic shielding materials, namely two sliced polypropylene electromagnetic shielding composite materials, clamping a grid structure in the middle, bonding at high temperature to form a high-conductivity electromagnetic shielding material film, and cutting into specified sizes according to requirements;
in the step S6, after the specified size obtained after cutting is prepared, electrochemical deposition is carried out on the metal particles, so that the metal particles are coated on the outer surface of the metal particles under the deposition for 1-10 hours to form a continuous metal layer, and a final high-conductivity electromagnetic shielding material film is obtained.
Example IV
The preparation method of the high-conductivity electromagnetic shielding material comprises the following steps:
s1: material preparation: selecting 48 parts of polypropylene, 18 parts of graphite, 8 parts of tackifier, 8 parts of vulcanizing agent, 16 parts of flame retardant, 16 parts of carbon fiber and 16 parts of nitrile silicone rubber as raw materials for preparation by professionals, and treating the selected raw materials;
s2: material processing, namely placing half of the raw materials prepared in the step S1 into a stirrer for stirring, placing the materials into a high-temperature melting furnace for mixed heating, placing the other half of the materials into a container, adding a cross-linking agent, nickel oxide and ferric oxide AS auxiliary agents, and enabling AS resin and filler to generate chemical reaction to form a grid structure;
s3: granulating the product heated and formed in the step S2, extruding and forming the granulated material, and preparing the polypropylene electromagnetic shielding composite material, wherein the raw materials are heated in the step S2 and form a completely molten state during extrusion, and fully and uniformly mixing;
s4: carrying out surface treatment on the polypropylene electromagnetic shielding composite material prepared in the step S3, and carrying out laser cutting to form a sheet with the thickness of 0.3-0.5 microns;
s5: carrying out laser slicing on the grid structure prepared in the step S2, wherein the slicing thickness is 0.2-0.4 microns;
s6: preparing high-conductivity electromagnetic shielding materials, namely two sliced polypropylene electromagnetic shielding composite materials, clamping a grid structure in the middle, bonding at high temperature to form a high-conductivity electromagnetic shielding material film, and cutting into specified sizes according to requirements;
in the step S6, after the specified size obtained after cutting is prepared, electrochemical deposition is carried out on the metal particles, so that the metal particles are coated on the outer surface of the metal particles under the deposition for 1-10 hours to form a continuous metal layer, and a final high-conductivity electromagnetic shielding material film is obtained.
Example five
The preparation method of the high-conductivity electromagnetic shielding material comprises the following steps:
s1: material preparation: selecting 50 parts of polypropylene, 19 parts of graphite, 9 parts of tackifier, 9 parts of vulcanizing agent, 18 parts of flame retardant, 18 parts of carbon fiber and 18 parts of fluorosilicone rubber as raw materials for preparation by professionals, and treating the selected raw materials;
s2: material processing, namely placing half of the raw materials prepared in the step S1 into a stirrer for stirring, placing the materials into a high-temperature melting furnace for mixed heating, placing the other half of the materials into a container, adding a cross-linking agent and one or more of nickel hydroxide and calcium carbonate AS auxiliary agents, and enabling AS resin and filler to generate chemical reaction to form a grid structure;
s3: granulating the product heated and formed in the step S2, extruding and forming the granulated material, and preparing the polypropylene electromagnetic shielding composite material, wherein the raw materials are heated in the step S2 and form a completely molten state during extrusion, and fully and uniformly mixing;
s4: carrying out surface treatment on the polypropylene electromagnetic shielding composite material prepared in the step S3, and carrying out laser cutting to form a sheet with the thickness of 0.3-0.5 microns;
s5: carrying out laser slicing on the grid structure prepared in the step S2, wherein the slicing thickness is 0.2-0.4 microns;
s6: preparing high-conductivity electromagnetic shielding materials, namely two sliced polypropylene electromagnetic shielding composite materials, clamping a grid structure in the middle, bonding at high temperature to form a high-conductivity electromagnetic shielding material film, and cutting into specified sizes according to requirements;
in the step S6, after the specified size obtained after cutting is prepared, electrochemical deposition is carried out on the metal particles, so that the metal particles are coated on the outer surface of the metal particles under the deposition for 1-10 hours to form a continuous metal layer, and a final high-conductivity electromagnetic shielding material film is obtained.
Example six
The preparation method of the high-conductivity electromagnetic shielding material comprises the following steps:
s1: material preparation: selecting 60 parts of polypropylene, 20 parts of graphite, 10 parts of tackifier, 10 parts of vulcanizing agent, 20 parts of flame retardant, 20 parts of carbon fiber, 20 parts of methyl silicone rubber and fluorosilicone rubber as raw materials for preparation by a professional, and treating the selected raw materials;
s2: material processing, namely placing half of the raw materials prepared in the step S1 into a stirrer for stirring, placing the materials into a high-temperature melting furnace for mixed heating, placing the other half of the materials into a container, adding a cross-linking agent, nickel acetate and ferroferric oxide AS auxiliary agents, and enabling AS resin and filler to generate chemical reaction to form a grid structure;
s3: granulating the product heated and formed in the step S2, extruding and forming the granulated material, and preparing the polypropylene electromagnetic shielding composite material, wherein the raw materials are heated in the step S2 and form a completely molten state during extrusion, and fully and uniformly mixing;
s4: carrying out surface treatment on the polypropylene electromagnetic shielding composite material prepared in the step S3, and carrying out laser cutting to form a sheet with the thickness of 0.3-0.5 microns;
s5: carrying out laser slicing on the grid structure prepared in the step S2, wherein the slicing thickness is 0.2-0.4 microns;
s6: preparing high-conductivity electromagnetic shielding materials, namely two sliced polypropylene electromagnetic shielding composite materials, clamping a grid structure in the middle, bonding at high temperature to form a high-conductivity electromagnetic shielding material film, and cutting into specified sizes according to requirements;
in the step S6, after the specified size obtained after cutting is prepared, electrochemical deposition is carried out on the metal particles, so that the metal particles are coated on the outer surface of the metal particles under the deposition for 1-10 hours to form a continuous metal layer, and a final high-conductivity electromagnetic shielding material film is obtained.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are only preferred embodiments of the present invention, and are not intended to limit the invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The high-conductivity electromagnetic shielding material is characterized by comprising the following raw materials in parts by mass: 40-60 parts of polypropylene, 15-20 parts of graphite, 5-10 parts of tackifier, 5-10 parts of vulcanizing agent, 10-20 parts of flame retardant, 10-20 parts of carbon fiber and 10-20 parts of silicone rubber.
2. The highly conductive electromagnetic shielding material of claim 1, wherein: the high-conductivity electromagnetic shielding material is prepared by mixing polypropylene, graphite, tackifier, vulcanizing agent, flame retardant, carbon fiber and silicone rubber according to the proportion, and preforming the mixture into a required design shape of a product.
3. The highly conductive electromagnetic shielding material of claim 1, wherein: the silicone rubber is one or more of methyl silicone rubber, methyl vinyl phenyl silicone rubber, nitrile silicone rubber and fluoro silicone rubber.
4. The method for producing a highly conductive electromagnetic shielding material according to claim 1, comprising the steps of:
s1: material preparation: selecting polypropylene, graphite, tackifier, vulcanizing agent, flame retardant, carbon fiber and silicone rubber as raw materials for preparation by professionals, and treating the selected raw materials;
s2: material processing, namely placing half of the raw materials prepared in the step S1 into a stirrer for stirring, placing the materials into a high-temperature melting furnace for mixed heating, placing the other half of the materials into a container, and adding a cross-linking agent and an auxiliary agent to enable the AS resin and the filler to generate chemical reaction so AS to form a grid structure;
s3: granulating the product heated and formed in the step S2, extruding and forming the granulated material, and preparing a polypropylene electromagnetic shielding composite material;
s4: carrying out surface treatment on the polypropylene electromagnetic shielding composite material prepared in the step S3, and carrying out laser cutting to form a sheet with the thickness of 0.3-0.5 microns;
s5: carrying out laser slicing on the grid structure prepared in the step S2, wherein the slicing thickness is 0.2-0.4 microns;
s6: preparing high-conductivity electromagnetic shielding materials, namely two polypropylene electromagnetic shielding composite materials in slices, clamping a grid structure in the middle, bonding at high temperature to form a high-conductivity electromagnetic shielding material film, and cutting into specified sizes according to requirements.
5. The method for producing a highly conductive electromagnetic shielding material according to claim 4, wherein: in the step S3, the raw materials are heated in the step S2 to form a completely molten state, and the materials are fully and uniformly mixed.
6. The method for producing a highly conductive electromagnetic shielding material according to claim 4, wherein: the auxiliary agent comprises the following components: one or more of nickel-based, iron-based, and calcium-based compounds.
7. The method for producing a highly conductive electromagnetic shielding material according to claim 6, wherein: the nickel-based or iron-based compound is as follows: nickel oxide or nickel hydroxide or nickel acetate or iron oxide or iron acetate or iron oxide; the calcium-based compound is calcium oxide or calcium carbonate.
8. The method for producing a highly conductive electromagnetic shielding material according to claim 4, wherein: in the step S6, after the specified size obtained after cutting is prepared, electrochemical deposition is carried out on the metal particles, so that the metal particles are coated on the outer surface of the metal particles under the deposition for 1-10 hours to form a continuous metal layer, and a final high-conductivity electromagnetic shielding material film is obtained.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311554879.XA CN117777593A (en) | 2023-11-21 | 2023-11-21 | High-conductivity electromagnetic shielding material and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311554879.XA CN117777593A (en) | 2023-11-21 | 2023-11-21 | High-conductivity electromagnetic shielding material and preparation method thereof |
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