CN114163682A - Application of electromagnetic material modification method in preparation of polyimide foam electromagnetic shielding material - Google Patents
Application of electromagnetic material modification method in preparation of polyimide foam electromagnetic shielding material Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 85
- 239000006260 foam Substances 0.000 title claims abstract description 43
- 239000004642 Polyimide Substances 0.000 title claims abstract description 42
- 229920001721 polyimide Polymers 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 238000002715 modification method Methods 0.000 title claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 25
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 17
- 239000000843 powder Substances 0.000 claims abstract description 16
- 238000012986 modification Methods 0.000 claims abstract description 11
- 230000004048 modification Effects 0.000 claims abstract description 11
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 16
- 239000006185 dispersion Substances 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- 238000002604 ultrasonography Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 7
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 6
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 6
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 239000002356 single layer Substances 0.000 claims description 6
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 239000002798 polar solvent Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 3
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 claims description 2
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 claims description 2
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 238000002525 ultrasonication Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 4
- 231100000053 low toxicity Toxicity 0.000 abstract description 4
- 230000002195 synergetic effect Effects 0.000 abstract description 3
- 231100000331 toxic Toxicity 0.000 abstract description 3
- 230000002588 toxic effect Effects 0.000 abstract description 3
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 2
- 239000002131 composite material Substances 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 6
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 description 5
- 239000011259 mixed solution Substances 0.000 description 5
- 235000010413 sodium alginate Nutrition 0.000 description 5
- 239000000661 sodium alginate Substances 0.000 description 5
- 229940005550 sodium alginate Drugs 0.000 description 5
- 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 description 4
- 239000003063 flame retardant Substances 0.000 description 4
- 239000006261 foam material Substances 0.000 description 4
- 238000009210 therapy by ultrasound Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 239000006258 conductive agent Substances 0.000 description 2
- 229920001940 conductive polymer Polymers 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 238000001723 curing Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000002086 nanomaterial Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- NWZSZGALRFJKBT-KNIFDHDWSA-N (2s)-2,6-diaminohexanoic acid;(2s)-2-hydroxybutanedioic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O.NCCCC[C@H](N)C(O)=O NWZSZGALRFJKBT-KNIFDHDWSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 239000002042 Silver nanowire Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012377 drug delivery Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- IKDUDTNKRLTJSI-UHFFFAOYSA-N hydrazine monohydrate Substances O.NN IKDUDTNKRLTJSI-UHFFFAOYSA-N 0.000 description 1
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002070 nanowire Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 229920000128 polypyrrole Polymers 0.000 description 1
- 229920000123 polythiophene Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/36—After-treatment
- C08J9/365—Coating
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/24—Electrically-conducting paints
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2379/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen, or carbon only, not provided for in groups C08J2361/00 - C08J2377/00
- C08J2379/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C08J2379/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
Abstract
The invention belongs to the technical field of electromagnetic shielding material preparation, and particularly relates to an application of an electromagnetic material modification method in preparation of a polyimide foam electromagnetic shielding material; graphene and Fe pairs using silane coupling agents3O4After the powder is subjected to surface modification, the powder can generate a conductive synergistic enhancement effect to obtain stronger electromagnetic shielding capability, and the powder can be directly coated on the surface of polyimide foam to obtain electromagnetic shielding performance and flame retardanceThe shielding material has excellent fireproof performance, low toxicity and excellent heat insulating performance. The preparation method is simple, can prepare shielding materials with various sizes, is easy for large-scale production, has no pollution to the environment and has no toxic action on human bodies.
Description
Technical Field
The invention belongs to the technical field of electromagnetic shielding material preparation, and particularly relates to an application of an electromagnetic material modification method in preparation of a polyimide foam electromagnetic shielding material.
Background
With the rapid development of electronic industry technology, various electronic and electrical devices in the sun are increasingly used in life, industry and military, when the devices are in operation, a large amount of electromagnetic waves with different wavelengths and frequencies are continuously radiated to the surrounding space due to the change of voltage, and the electromagnetic waves can cause more or less harm to other devices and organisms, which is called electromagnetic pollution (EMI). The common electromagnetic shielding material is composed of a metal-based electromagnetic shielding material and a polymer-based electromagnetic shielding material, and compared with other materials, the polymer foam electromagnetic shielding material in the polymer-based electromagnetic shielding material has the advantages of low density, good corrosion resistance, easiness in processing and forming, convenience in installation and maintenance, good flexibility and the like. Compared with other high polymer foams, the polyimide foam electromagnetic shielding material has the advantages of high flame resistance level, no release of smoke and toxic and harmful gases in fire, good corrosion resistance and the like.
Graphene (Graphene) is sp2The hybridized and connected carbon atoms are tightly stacked into a new material with a single-layer two-dimensional honeycomb lattice structure, so that the novel material has excellent optical, electrical and mechanical properties, and has important application prospects in the aspects of materials science, micro-nano processing, energy, biomedicine, drug delivery and the like. Single-layer Graphene (Graphene) refers to a two-dimensional carbon material consisting of a layer of carbon atoms closely packed periodically in a benzene ring structure (i.e., a hexagonal honeycomb structure).
Patent document No. CN110294857A discloses a synergistically enhanced electromagnetic shielding film and a preparation method thereof, wherein a conductive agent and sodium alginate are mixed and dissolved to obtain a conductive shielding sodium alginate functional mixed solution, a magnetic nano material and sodium alginate are dissolved and dispersed to obtain a magnetic field shielding sodium alginate functional mixed solution, the two are respectively coated on two sides of a film substrate material, and the film substrate material is placed in a calcium chloride solution for crosslinking and curing, washed and dried to obtain the synergistically enhanced electromagnetic shielding film. Wherein the conductive agent is one or more of carbon nano tube, graphene, silver nano wire, copper nano wire, polythiophene conductive polymer or polypyrrole conductive polymer; the magnetic nano material is one or more of nickel, cobalt and ferroferric oxide. However, this patent document uses sodium alginate and calcium chloride solution to perform crosslinking, curing and modification on the electromagnetic material.
Patent document No. CN106243379B discloses an electromagnetic shielding foam composite material based on graphene oxide and a polymer and a preparation method thereof, and specifically, the electromagnetic shielding foam composite material based on reduced graphene oxide is obtained by soaking polymer foam in graphene oxide aqueous dispersion, drying, placing in hydriodic acid or hydrazine hydrate solution, refluxing, washing and drying. However, the invention cannot ensure that the graphene oxide is completely reduced to graphene, and the unreduced graphene oxide has poor chemical and thermal stability due to the existence of hydroxyl, carbonyl, carboxyl, epoxy and the like, so that the performance of the final material is affected.
The literature "preparation and performance research of polyimide-based composite foam, wangting, academic thesis of engineering major university of harbin, 2017" is studied on preparation and performance of polyimide-based composite foam, wherein the research is carried out on PI/graphite microchip composite material and PI/Fe3O4The syntactic foams were prepared and their properties were measured.
Disclosure of Invention
The invention provides an application of an electromagnetic material modification method in preparation of a polyimide foam electromagnetic shielding material in order to solve the problems.
The method is realized by the following technical scheme:
1. an application of an electromagnetic material modification method in preparing a polyimide foam electromagnetic shielding material.
Furthermore, the electromagnetic material comprises 0.1-15 parts by weight of graphene single-layer sheet and 0.1-35 parts by weight of Fe3O4And (3) powder composition.
Further, said Fe3O4The particle size of the powder is 50nm-2000 nm.
2. The modification method of the electromagnetic material is to modify the surface of the electromagnetic material by adopting a silane coupling agent under the condition of assisting ultrasonic treatment.
Further, the silane coupling agent is one or a mixture of several of KH550, KH570, KH540, KH590, KH792, KH560, Si602, Si563, Si780, A171, A172, A151 and D69, and the proportion is mixed in any ratio.
Further, the ultrasound, specifically, the ultrasound power is 50W-300W, the ultrasound duration is 1 minute-120 minutes, the stirring speed is 30 rpm-600 rpm, and the stirring duration is 1 minute-120 minutes.
3. The preparation method of the electromagnetic shielding material comprises the following steps:
(1) firstly, dispersing an electromagnetic material in 100 parts of polar solvent;
(2) adding 0.1-15 parts by weight of silane coupling agent to carry out surface modification on the electromagnetic material to obtain mixed dispersion liquid;
(3) and (3) uniformly coating 5-100 parts of the mixed dispersion liquid on all outer surfaces of the polyimide foam board, and drying to obtain the polyimide foam electromagnetic shielding material.
Further, the polar solvent is one or a mixture of more of acetone, tetrahydrofuran, N-dimethylformamide, N-dimethylacetamide, water, ethyl acetate, cyclohexane, acetic acid, ethanol and dioxane in any ratio.
Further, the polyimide foam board is long: 200mm-800mm, width: 200mm-800mm, thickness: 10mm-500 mm.
Further, the drying is carried out at the temperature of 60-260 ℃ for 0.5-6.5 hours.
In conclusion, the beneficial effects of the invention are as follows: the invention adopts silane coupling agent to couple graphene and Fe3O4After the powder is subjected to surface modification, the powder can generate a conductive synergistic enhancement effect to obtain stronger electromagnetic shielding capability, and the powder is directly coated on a polyimide bubbleThe surface is foamed to obtain the shielding material with excellent electromagnetic shielding performance, flame retardant and fireproof performance, low toxicity and heat insulating performance. The preparation method is simple, can prepare shielding materials with various sizes, is easy for large-scale production, has no pollution to the environment and has no toxic action on human bodies.
Wherein, the invention uses graphene and Fe with large specific surface area3O4The graphene has high conductivity and a special two-dimensional layered structure, the layers are mutually linked to form a good conductive path, and the graphene and Fe can be subjected to grafting effect after modification by the silane coupling agent3O4The connection between the conductive paths is tighter, and the number of the conductive paths is more. Meanwhile, due to modification of the silane coupling agent, graphene and Fe3O4And a 'molecular bridge' can be erected between the polyimide foam and the adhesive, so that the mutual bonding strength is improved, the bonding is tighter, the service life of the material can be prolonged, and the mechanical strength is improved. And non-combustible graphene and Fe3O4The effective linking of the polyimide foam material can greatly improve the flame retardant property of the polyimide foam material. Nano Fe3O4Is a magnetic material with excellent performance, high saturation magnetization intensity, good chemical stability and modified Fe3O4After the graphene and the polyimide foam material are coated on the polyimide foam material, the conductive synergistic enhancement effect can be generated, the shielding material with excellent electromagnetic shielding performance, flame-retardant and fireproof performance, low toxicity and heat-insulating performance can be obtained, large-scale mass production is easy, and the graphene-based composite material can be used as a shielding material in places with electromagnetic shielding requirements in the military and civil fields.
Detailed Description
The following is a detailed description of the embodiments of the present invention, but the present invention is not limited to these embodiments, and any modifications or substitutions in the basic spirit of the embodiments are included in the scope of the present invention as claimed in the claims.
Example 1
1. An application of an electromagnetic material modification method in preparing a polyimide foam electromagnetic shielding material.
Further, the electromagnetic material is prepared from5.0g graphene monoliths, 5.0g Fe3O4And (3) powder composition.
Further, said Fe3O4The particle size of the powder is 80 nm.
2. The modification method of the electromagnetic material is to modify the surface of the electromagnetic material by adopting a silane coupling agent under the condition of assisting ultrasonic treatment.
Further, the silane coupling agent is KH 550.
Further, the ultrasound specifically comprises the ultrasound power of 100W, the ultrasound duration of 10 minutes, the stirring speed of 60 rpm, and the stirring duration of 10 minutes.
3. The preparation method of the electromagnetic shielding material comprises the following steps:
(1) firstly, dispersing an electromagnetic material in a mixed solution of 100.0g of tetrahydrofuran and 40.0g of water;
(2) adding 3.0gKH550 to carry out surface modification on the electromagnetic material to obtain mixed dispersion liquid;
(3) 150g of the mixed dispersion was uniformly coated on all surfaces of polyimide foam having a size of 300mm × 600mm × 50mm, and placed in an oven at 120 ℃ for 3 hours to obtain a polyimide foam electromagnetic shielding material.
Example 2
1. An application of an electromagnetic material modification method in preparing a polyimide foam electromagnetic shielding material.
Furthermore, the electromagnetic material consists of 2.0g of graphene single-layer sheet and 8.0g of Fe3O4And (3) powder composition.
Further, said Fe3O4The particle size of the powder is 100 nm.
2. The modification method of the electromagnetic material is to modify the surface of the electromagnetic material by adopting a silane coupling agent under the condition of assisting ultrasonic treatment.
Further, the silane coupling agent was a mixture of 0.5g A171 and 1.5g KH 570.
Further, the ultrasonic power is 100W, the ultrasonic time is 20 minutes, the stirring speed is 60 rpm, and the stirring time is 20 minutes.
3. The preparation method of the electromagnetic shielding material comprises the following steps:
(1) firstly, dispersing an electromagnetic material in a mixed solution of 100.0g N, N-dimethylformamide and 40.0g of ethanol;
(2) adding 0.5g A171 and 0.5g KH570 to modify the surface of the electromagnetic material to obtain a mixed dispersion;
(3) 120g of the mixed dispersion liquid is uniformly coated on all surfaces of polyimide foam with the size of 300mm multiplied by 600mm multiplied by 50mm, and the polyimide foam electromagnetic shielding material is obtained after the polyimide foam electromagnetic shielding material is placed in an oven with the temperature of 180 ℃ for 2 hours.
Example 3
1. An application of an electromagnetic material modification method in preparing a polyimide foam electromagnetic shielding material.
Further, the electromagnetic material consists of 8.0g of graphene single-layer sheet and 2.0g of Fe3O4And (3) powder composition.
Further, said Fe3O4The particle size of the powder is 60 nm.
2. The modification method of the electromagnetic material is to modify the surface of the electromagnetic material by adopting a silane coupling agent under the condition of assisting ultrasonic treatment.
Further, the silane coupling agent was a mixture of 2.5g of Si602 and 2.5g D69.
Further, the ultrasonic power is 150W, the ultrasonic time is 30 minutes, the stirring speed is 100 rpm, and the stirring time is 30 minutes.
3. The preparation method of the electromagnetic shielding material comprises the following steps:
(1) firstly, dispersing an electromagnetic material in a mixed solution of 100.0g of acetone and 40.0g of water;
(2) adding 2.5g of Si602 and 2.5g D69 to carry out surface modification on the electromagnetic material to obtain a mixed dispersion liquid;
(3) 150g of the mixed dispersion was uniformly coated on all surfaces of polyimide foam having dimensions of 500mm × 500mm × 20mm, and placed in an oven at 200 ℃ for 1.5 hours to obtain a polyimide foam electromagnetic shielding material.
Comparative example 1
The difference between the polyimide foam electromagnetic shielding material and the preparation method thereof in the embodiment 1 is that:
the polyimide foam in step (3) had dimensions of 500mm × 500mm × 20mm, and the oven temperature was 260 ℃.
Comparative example 2
The difference between the polyimide foam electromagnetic shielding material and the preparation method thereof in the embodiment 2 is that:
the silane coupling agent in step (2) is KH590 and Si 780.
The oven temperature in step (3) was 240 ℃.
Performance test of polyimide foam electromagnetic shielding material
The rigid polyimide foams obtained in examples 1 to 3 and comparative examples 1 to 2 were measured for electrical conductivity, electromagnetic shielding effectiveness, thermal conductivity and limiting oxygen index, and the results are shown in Table 1.
TABLE 1
According to the detection result, the shielding material with excellent electromagnetic shielding performance, flame-retardant and fireproof performance, low toxicity and heat-insulating performance can be obtained.
Claims (10)
1. An application of an electromagnetic material modification method in preparing a polyimide foam electromagnetic shielding material.
2. The use according to claim 1, wherein the electromagnetic material is composed of, by weight, 0.1 to 15 parts of graphene monolayer sheet and 0.1 to 35 parts of Fe3O4And (3) powder composition.
3. Use according to claim 2, wherein said Fe is3O4The particle size of the powder is 50nm-2000 nm.
4. The use according to claim 1, wherein the modification is carried out by modifying the surface of the electromagnetic material with a silane coupling agent with the aid of ultrasonication.
5. The method according to claim 4, wherein the silane coupling agent is one or more selected from the group consisting of KH550, KH570, KH540, KH590, KH792, KH560, Si602, Si563, Si780, A171, A172, A151 and D69, and the ratio thereof is any ratio.
6. The use according to claim 4, wherein the ultrasound, in particular the ultrasound power, is 50W to 300W, the ultrasound duration is 1 minute to 120 minutes, the stirring speed is 30 revolutions per minute to 600 revolutions per minute, and the stirring duration is 1 minute to 120 minutes.
7. The preparation method of the polyimide foam electromagnetic shielding material is characterized by comprising the following steps of:
(1) firstly, dispersing an electromagnetic material in 100 parts of polar solvent;
(2) adding 0.1-15 parts by weight of silane coupling agent to carry out surface modification on the electromagnetic material to obtain mixed dispersion liquid;
(3) and (3) uniformly coating 5-100 parts of the mixed dispersion liquid on all outer surfaces of the polyimide foam board, and drying to obtain the polyimide foam electromagnetic shielding material.
8. The method for preparing polyimide foam electromagnetic shielding material according to claim 7, wherein the polar solvent is one or a mixture of several of acetone, tetrahydrofuran, N-dimethylformamide, N-dimethylacetamide, water, ethyl acetate, cyclohexane, acetic acid, ethanol and dioxane in any ratio.
9. The method for preparing polyimide foam electromagnetic shielding material according to claim 7, wherein the polyimide foam board has a length of: 200mm-800mm, width: 200mm-800mm, thickness: 10mm-500 mm.
10. The method for preparing polyimide foam electromagnetic shielding material of claim 7, wherein the drying is carried out at 60-260 ℃ for 0.5-6.5 hours.
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