WO2005101942A1 - 押出し可能な架橋済グリース状電磁波吸収材 - Google Patents
押出し可能な架橋済グリース状電磁波吸収材 Download PDFInfo
- Publication number
- WO2005101942A1 WO2005101942A1 PCT/JP2004/015489 JP2004015489W WO2005101942A1 WO 2005101942 A1 WO2005101942 A1 WO 2005101942A1 JP 2004015489 W JP2004015489 W JP 2004015489W WO 2005101942 A1 WO2005101942 A1 WO 2005101942A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- electromagnetic wave
- wave absorbing
- crosslinked
- grease
- absorbing material
- Prior art date
Links
- 239000006096 absorbing agent Substances 0.000 title claims abstract description 32
- 229920001296 polysiloxane Polymers 0.000 claims abstract description 72
- 239000000945 filler Substances 0.000 claims abstract description 45
- 238000010521 absorption reaction Methods 0.000 claims abstract description 24
- 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 8
- 239000003063 flame retardant Substances 0.000 claims abstract description 8
- 239000011358 absorbing material Substances 0.000 claims description 63
- 229910001035 Soft ferrite Inorganic materials 0.000 claims description 42
- 239000002184 metal Substances 0.000 claims description 32
- 229910052751 metal Inorganic materials 0.000 claims description 32
- 239000000843 powder Substances 0.000 claims description 32
- 238000000034 method Methods 0.000 claims description 28
- 239000000463 material Substances 0.000 claims description 26
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 22
- 239000012530 fluid Substances 0.000 claims description 21
- 229910000077 silane Inorganic materials 0.000 claims description 19
- -1 silane compound Chemical class 0.000 claims description 18
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- 239000002994 raw material Substances 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 10
- 230000005855 radiation Effects 0.000 claims description 9
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 8
- 125000000524 functional group Chemical group 0.000 claims description 7
- BFXIKLCIZHOAAZ-UHFFFAOYSA-N methyltrimethoxysilane Chemical compound CO[Si](C)(OC)OC BFXIKLCIZHOAAZ-UHFFFAOYSA-N 0.000 claims description 6
- JJQZDUKDJDQPMQ-UHFFFAOYSA-N dimethoxy(dimethyl)silane Chemical compound CO[Si](C)(C)OC JJQZDUKDJDQPMQ-UHFFFAOYSA-N 0.000 claims description 5
- 239000010409 thin film Substances 0.000 claims description 3
- 239000002023 wood Substances 0.000 claims 1
- 230000002745 absorbent Effects 0.000 abstract 1
- 239000002250 absorbent Substances 0.000 abstract 1
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- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 10
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 9
- 125000003342 alkenyl group Chemical group 0.000 description 9
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
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- 239000011347 resin Substances 0.000 description 7
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 238000007259 addition reaction Methods 0.000 description 6
- 239000011230 binding agent Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
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- 230000035699 permeability Effects 0.000 description 6
- 238000004381 surface treatment Methods 0.000 description 6
- 229910018605 Ni—Zn Inorganic materials 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 5
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- 239000007788 liquid Substances 0.000 description 5
- 229920002050 silicone resin Polymers 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 108010010803 Gelatin Proteins 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 239000010419 fine particle Substances 0.000 description 4
- 239000008273 gelatin Substances 0.000 description 4
- 229920000159 gelatin Polymers 0.000 description 4
- 235000019322 gelatine Nutrition 0.000 description 4
- 235000011852 gelatine desserts Nutrition 0.000 description 4
- 239000004519 grease Substances 0.000 description 4
- 239000006247 magnetic powder Substances 0.000 description 4
- 229920006136 organohydrogenpolysiloxane Polymers 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- 125000000217 alkyl group Chemical group 0.000 description 3
- 125000003118 aryl group Chemical group 0.000 description 3
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
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- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 229910008423 Si—B Inorganic materials 0.000 description 2
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- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 description 2
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- 125000000753 cycloalkyl group Chemical group 0.000 description 2
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 2
- 125000001511 cyclopentyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C1([H])[H] 0.000 description 2
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- UCNNJGDEJXIUCC-UHFFFAOYSA-L hydroxy(oxo)iron;iron Chemical compound [Fe].O[Fe]=O.O[Fe]=O UCNNJGDEJXIUCC-UHFFFAOYSA-L 0.000 description 2
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- 238000005259 measurement Methods 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 239000006072 paste Substances 0.000 description 2
- 238000005191 phase separation Methods 0.000 description 2
- 125000000286 phenylethyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])C([H])([H])* 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 229920002379 silicone rubber Polymers 0.000 description 2
- 239000004945 silicone rubber Substances 0.000 description 2
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- 125000003944 tolyl group Chemical group 0.000 description 2
- 238000009849 vacuum degassing Methods 0.000 description 2
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 229910002467 CrFe Inorganic materials 0.000 description 1
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- 229910017518 Cu Zn Inorganic materials 0.000 description 1
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- 239000004593 Epoxy Substances 0.000 description 1
- 229910017060 Fe Cr Inorganic materials 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910002544 Fe-Cr Inorganic materials 0.000 description 1
- 229910017082 Fe-Si Inorganic materials 0.000 description 1
- 229910017133 Fe—Si Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 229910003296 Ni-Mo Inorganic materials 0.000 description 1
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- MGTPLVPKJIZKQE-UHFFFAOYSA-N [Pt]#P Chemical compound [Pt]#P MGTPLVPKJIZKQE-UHFFFAOYSA-N 0.000 description 1
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- KQAHMVLQCSALSX-UHFFFAOYSA-N decyl(trimethoxy)silane Chemical compound CCCCCCCCCC[Si](OC)(OC)OC KQAHMVLQCSALSX-UHFFFAOYSA-N 0.000 description 1
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- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
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- AHUXYBVKTIBBJW-UHFFFAOYSA-N dimethoxy(diphenyl)silane Chemical compound C=1C=CC=CC=1[Si](OC)(OC)C1=CC=CC=C1 AHUXYBVKTIBBJW-UHFFFAOYSA-N 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- FJKCDSVHCNEOOS-UHFFFAOYSA-N ethoxy(diphenyl)silane Chemical compound C=1C=CC=CC=1[SiH](OCC)C1=CC=CC=C1 FJKCDSVHCNEOOS-UHFFFAOYSA-N 0.000 description 1
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- 239000012212 insulator Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
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- 230000007246 mechanism Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- DDTIGTPWGISMKL-UHFFFAOYSA-N molybdenum nickel Chemical compound [Ni].[Mo] DDTIGTPWGISMKL-UHFFFAOYSA-N 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000001028 reflection method Methods 0.000 description 1
- 229910000702 sendust Inorganic materials 0.000 description 1
- 150000004756 silanes Chemical class 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000006884 silylation reaction Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- 229920001187 thermosetting polymer Polymers 0.000 description 1
- CPUDPFPXCZDNGI-UHFFFAOYSA-N triethoxy(methyl)silane Chemical compound CCO[Si](C)(OCC)OCC CPUDPFPXCZDNGI-UHFFFAOYSA-N 0.000 description 1
- JCVQKRGIASEUKR-UHFFFAOYSA-N triethoxy(phenyl)silane Chemical compound CCO[Si](OCC)(OCC)C1=CC=CC=C1 JCVQKRGIASEUKR-UHFFFAOYSA-N 0.000 description 1
- XYJRNCYWTVGEEG-UHFFFAOYSA-N trimethoxy(2-methylpropyl)silane Chemical compound CO[Si](OC)(OC)CC(C)C XYJRNCYWTVGEEG-UHFFFAOYSA-N 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/34—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites
- H01F1/36—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites in the form of particles
- H01F1/37—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites in the form of particles in a bonding agent
-
- 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
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
- H05K9/0083—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising electro-conductive non-fibrous particles embedded in an electrically insulating supporting structure, e.g. powder, flakes, whiskers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/10—Metal compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
Definitions
- the present invention relates to an extrudable grease-like electromagnetic wave absorbing material which can be extruded, a container filled and sealed with the material, a method of manufacturing the container, and an electromagnetic wave absorbing method using the same.
- Extrudable cross-linked grease that can be applied to gaps and thin coatings when it is difficult to apply to sheet products that have excellent heat resistance and flame retardancy and has little temperature dependence, or when sheet sticking work is extremely poor TECHNICAL FIELD
- the present invention relates to an electromagnetic wave absorbing material, a container filled and sealed with the material, a method for producing the container, and an electromagnetic wave absorbing method using the same.
- the electromagnetic wave absorber absorbs the electromagnetic wave energy of the noise generated by utilizing the magnetic loss characteristics, converts it into heat energy, and suppresses the reflection and transmission inside the housing. It is necessary to have a function that lowers the electromagnetic energy level by deteriorating the antenna effect of the electromagnetic energy emitted as an antenna by using a filter with impedance, and a device that has these functions sufficiently is desired. .
- Patent Literature 2 An electromagnetic interference suppressor (Patent Literature 2) has been proposed in which a support, an absolutely green soft magnetic layer composed of a soft magnetic powder and an organic binder are laminated.
- an electromagnetic wave absorbing layer in which an electromagnetic wave absorbing filler is dispersed in the silicone resin is laminated on at least one surface of the electromagnetic wave reflecting layer in which the conductive filler is dispersed in the silicone resin.
- An electromagnetic wave absorber (Patent Literature 3) is disclosed, which has high electromagnetic wave absorption performance, high electromagnetic wave shielding performance, and reflects the properties of silicone resin itself to improve processability, flexibility, and weather resistance. It is said to be excellent in heat resistance and heat resistance.
- an electromagnetic wave absorbing heat conductive silicone gel molded sheet formed from a silicone gel composition containing metal oxide magnetic particles such as ferrite and a heat conductive filler such as a metal oxide Patent Document 4 Is disclosed.
- the structure of the electromagnetic wave absorber is formed in a sheet shape or the like, and an opening for improving heat radiation efficiency provided in a housing that is difficult to apply to a sheet product. Complicated cutting and other processing is necessary to handle parts (for example, slits) etc. I could't help.
- a high magnetic permeability insulating material containing 200 to 900 parts by weight of a soft magnetic material powder for 100 parts by weight of insulating resin.
- Patent Document 5 An electromagnetic wave absorbing adhesive composed of a viscous body in which an organic binder and a sendust soft magnetic powder containing a coupling agent are mixed (Patent Document 6), and a flat Fe A1—Si alloy powder Liquid magnetic interference preventing composition in which a composite magnetic paste composed of a freely-shapeable composition containing an organic binder (Patent Literature 7), carbon fiber, magnetic particles, and graphite resin are mixed with silicone resin (Patent Literature 8) Electromagnetic wave shielding material, which uses a magnetic powder mixed with a liquid thermosetting resin when applied (Patent Document 9), an electromagnetic wave absorbing material composed of magnetic particles, and an organic binder are kneaded.
- Electromagnetic wave absorption pace (Patent Document 10) is disclosed.
- any of these materials cannot be applied to the target places where liquid dripping, bleeding to the surroundings, and phase separation with the magnetic powder tend to occur easily. It was difficult and difficult to handle in a container.
- Patent Document 1 Japanese Patent No. 3097343
- Patent Document 2 JP-A-7-212079
- Patent Document 3 JP-A-2002-329995
- Patent Document 4 JP-A-11-335472
- Patent Document 5 Japanese Patent Application Laid-Open No. 4 252498
- Patent Document 6 Japanese Patent Application Laid-Open No. H11-50029
- Patent Document 7 JP-A-1154985
- Patent Document 8 JP-A-2000-244173
- Patent Document 9 JP 2001-284877 A
- Patent Document 10 Japanese Patent Application Laid-Open No. 2001-77585
- An extrudable cross-linked grease-like electromagnetic absorber that excels in electromagnetic wave absorption, thermal conductivity, flame retardancy, and has little temperature dependence. And a method of manufacturing the container, and a method of absorbing electromagnetic waves using the container.
- the present inventors have conducted intensive studies in order to solve such a problem, and as a result, an extrudable material obtained by dispersing an electromagnetic wave absorbing filler in a raw material for forming a silicone gel and heating the material has been obtained.
- the bridged grease-like material was thought to not flow because it was a cross-linked material, but it surprisingly flowed with a weak force from a syringe piston, etc., and could be processed into a specific shape. Even when the molded article is held under a slight load as described above, it has been found that the molded article has a self-retaining property of maintaining its shape as long as it is left naturally, and is preferably an electromagnetic wave absorber.
- a crosslinked grease-like electromagnetic wave absorber obtained by dispersing an electromagnetic wave absorbing filler in a crosslinked silicone gel, wherein the crosslinked grease-like electromagnetic wave absorber is provided.
- An electromagnetic wave absorber is provided.
- the crosslinkable silicone gel has a consistency of 50-200 QISK2220 1/4 cone), and is capable of being extruded.
- a grease-like electromagnetic wave absorbing material is provided.
- the filler for electromagnetic wave absorption is a mixture of an electromagnetic wave absorber and a flame retardant.
- a cross-linked grease-like electromagnetic wave absorbing material is provided.
- the electromagnetic wave absorber is soft ferrite and Z or flat soft magnetic metal powder surface-treated with a nonfunctional silane compound.
- An extrudable cross-linked grease-like electromagnetic wave absorbing material is provided.
- the soft ferrite surface-treated with the non-functional group-based silane compound is surface-treated with dimethyldimethoxysilane or methyltrimethoxysilane.
- An extrudable crosslinked grease-like electromagnetic wave absorbing material characterized by being soft ferrite is provided.
- the pH of the soft ferrite surface-treated with the nonfunctional silane compound is 8.5 or less.
- An extrudable crosslinked grease-like electromagnetic wave absorbing material is provided.
- the extrudable crosslinked grease-like electromagnetic wave absorbing material according to any one of the third to sixth aspects, wherein the flame retardant is magnetite. Is done.
- a container filled with and filled with the extrudable bridged grease-like electromagnetic wave absorbing material according to any one of the seventeenth to seventeenth aspects.
- the container according to the eighth aspect wherein the container is shaped like a syringe or a tube.
- the raw material of the crosslinked silicone gel and the electromagnetic wave absorbing filler are mixed during or after mixing.
- the method according to the eighth or ninth aspect of the invention is characterized in that the method further comprises heating and obtaining a crosslinked grease-like electromagnetic wave absorbing material, and then filling and enclosing the crosslinked grease-like electromagnetic wave absorbing material in a container. You.
- the filler for electromagnetic wave absorption when the filler for electromagnetic wave absorption is dispersed in the crosslinked silicone gel, the filler is obtained by mixing the raw material of the crosslinked silicone gel with the filler for electromagnetic wave absorption. After filling and sealing the mixed solution into a container, the entire container is heated to A method for producing the container according to the eighth or ninth aspect, characterized in that the silicone gel inside is crosslinked.
- the crosslinked grease-like electromagnetic wave absorbing material filled and sealed in the container of the eighth or ninth aspect of the present invention is formed into a thin film around the heat radiation opening of the housing.
- a method for absorbing unnecessary electromagnetic waves, which is applied and suppresses the emission of unnecessary electromagnetic waves from the heat radiation opening is provided.
- the extrudable crosslinked grease-like electromagnetic wave absorbing material of the present invention is excellent in electromagnetic wave absorbing property, heat conductivity and flame retardancy, and has little temperature dependency. Can be applied to cloth.
- the extrudable crosslinked grease-like heat radiating material of the present invention can be put in a container such as a tube or a syringe, such as grease, paste, or clay.
- a container such as a tube or a syringe, such as grease, paste, or clay.
- FIG. 1 is a view showing a measurement result of a magnetic loss of an electromagnetic wave absorbing material of an example.
- the present invention provides (a) an electromagnetic wave absorber containing (a) soft ferrite, (c) magnetite, and (d) silicone, (a) soft fly, (b) a flat soft magnetic metal powder, (c) An electromagnetic wave absorber containing magnetite and (d) a silicone gel, an electromagnetic wave absorbing layer composed of the electromagnetic wave absorbing material and an electromagnetic wave reflecting layer of a conductor, a release film layer, an electromagnetic wave absorbing layer, an electromagnetic wave reflecting layer, and an insulator layer , A pressure-sensitive adhesive layer and a release film layer in this order, which are laminated electromagnetic wave absorbers.
- an electromagnetic wave absorber containing (a) soft ferrite, (c) magnetite, and (d) silicone, (a) soft fly, (b) a flat soft magnetic metal powder, (c) An electromagnetic wave absorber containing magnetite and (d) a silicone gel, an electromagnetic wave absorbing layer composed of the electromagnetic wave absorbing material and an electromagnetic wave reflecting layer of a conductor, a release film layer, an
- the extrudable cross-linked grease-like electromagnetic wave absorbing material of the present invention is obtained by dispersing an electromagnetic wave absorbing filler in a cross-linked silicone gel.
- the container is filled and filled with a bridged grease-like electromagnetic wave absorbing material.
- the method for producing the container of the present invention is a method of filling and filling the extrudable cross-linked grease-like electromagnetic wave absorbing material.
- a crosslinked silicone gel is used as a matrix of the dully-like electromagnetic wave absorbing material.
- the crosslinked silicone gel itself is a known chemical substance, but the one used as the extrudable grease-like electromagnetic wave absorbing material of the present invention is that it has fluidity to the extent that it can be extruded, such as a syringe or a tube. Even if a large amount of filler is blended, it has plasticity and self-retaining property, does not contain low-molecular-weight silicone conjugates, has a small residual amount of alkenyl groups, and is directly bonded to silicon.
- a particular crosslinked silicone gel that satisfies conditions such as a low residual amount of hydrogen groups is particularly desirable.
- the consistency of the crosslinked silicone gel measured with a JIS K2220 1Z4 cone is 50-200. If the consistency is more than 200, self-retaining property is lost, and bleeding to the surroundings when applied is spread. If the consistency is less than 50, the fluidity becomes poor, which is not desirable.
- the method for producing the crosslinked silicone gel used in the present invention is not particularly limited, but usually, an organohydrogenpolysiloxane and an alkenylpolysiloxane described below are used as raw materials, and both are hydrolyzed in the presence of a catalyst. It is obtained from a silylation reaction (addition reaction). That is, in the present invention, the raw materials of the silicone gel often refer to organohydrogenpolysiloxane and alkalipolysiloxane.
- the organohydrogenpolysiloxane used as one of the raw materials is preferably represented by the following general formula (1).
- R 1 represents the same or different substituted or unsubstituted monovalent hydrocarbon group;
- R 3 and R 4 are R 1 or - represents H, at least two of R 2,
- R 3 and R 4 - represents H,
- X and y is an integer representing the number of each unit, each unit block Alternatively, they are arranged randomly, and random is preferred.
- X is an integer of 0 or more, but 10-30 is preferred.
- Y is an integer of 0 or more, but 1-10 is preferred.
- x + y is preferably a force of 30-200 which is an integer of 5-300.
- R 1 examples include an alkyl group such as a methyl group, an ethyl group, a propyl group and a butyl group, a cycloalkyl group such as a cyclopentyl group and a cyclohexyl group, an aryl group such as a phenyl group and a tolyl group, and a benzyl group.
- aralkyl groups such as a phenylethyl group, and halogenated hydrocarbons in which these hydrogen atoms are partially substituted with chlorine atoms, fluorine atoms, and the like.
- Hydrogen (Si-H) directly bonded to a silicon atom is necessary for performing an addition reaction (nodrosilyl reaction) with an alkenyl group bonded directly or indirectly to the silicon atom, and At least two are required in the hydrogen polysiloxane molecule, the number of hydrogen directly bonded to the silicon atom is small, and the number of crosslinking points is too small to form a silicone gel. If the number of hydrogen atoms directly bonded to the silicon atom which is no longer the same as the properties is too large, the number of cross-linking points is too large and the properties of the silicone rubber are undesirably unfavorable.
- the number of Si—H groups in the organohydrogenpolysiloxane has a relatively desirable ratio to the number of alkenyl groups in the alkenyl polysiloxane, and the ratio of Si—H groups to Zalkenyl groups is 0.1%. It is preferable in the present invention that the content be 85-1.25, especially the range of 0.9-11.1. Within this numerical range, the remaining alkali metal groups are reduced, the oxidation degradation is reduced in electronic devices exposed to high temperatures, the number of remaining Si—H groups is reduced, and the thermal conductivity due to hydrogen generation is reduced. The drop is less.
- Alkalipolysiloxane which is another raw material used for producing the crosslinked silicone gel of the present invention, is preferably represented by the following general formula (2).
- R 1 represents the same or different substituted or unsubstituted monovalent hydrocarbon group
- R 5 , R 6 and R 7 represent R 1 or alkaryl group.
- R 5 , R 6 and R 7 represent a alkenyl group
- s and t are integers indicating the number of each unit, and each unit is arranged in a block or randomly.
- S is an integer greater than or equal to
- t is an integer greater than or equal to
- s + t is an integer between 10 and 600
- R 1 examples include an alkyl group such as a methyl group, an ethyl group, a propyl group, and a butyl group; a cycloalkyl group such as a cyclopentyl group and a cyclohexyl group; an aryl group such as a fuel group and a tolyl group; and a benzyl group.
- aralkyl groups such as phenylethyl group, and halogenated hydrocarbons in which these hydrogen atoms are partially substituted by chlorine atoms, fluorine atoms and the like.
- alkyl group (vinyl group, aryl group, etc.) directly or indirectly bonded to a silicon atom is required to carry out an addition reaction (hydrosilyl reaction) with hydrogen (Si-H) directly bonded to the silicon atom.
- Hydrosilyl reaction hydrosilyl reaction
- Si-H hydrogen
- the number of alkenyl groups is too small, and the number of crosslinking points is too small to form a silicone gel. If the number of undesired alkenyl groups is too large, the number of crosslinking points is too large and the properties of the silicone rubber are undesirably unfavorable.
- the number of alkenyl groups in the alkenylpolysiloxane has a relatively desirable ratio with the number of hydrogen (Si—H) directly bonded to the silicon atom in the organohydrogen,
- the compound is contained in such an amount that the ratio of / alkenyl group becomes 0.85-1.25, and particularly the range of 0.9-1.1 is preferable in the present invention.
- the number of s + t determines the distance between the bridge points.If the number is small, the number of bridge points will increase, and if the number of s + t is too large, the number of bridge points will decrease and this will be preferable.
- the hydrogen polysiloxane represented by the general formula (1) has H (hydrogen group) directly bonded to a silicon atom, and is represented by the following general formula (2): Alkylpolysiloxanes have a carbon-carbon double bond, so that the carbon-carbon double bond and H (hydrogen group) cause an addition reaction, which is called a hydrosilylation reaction.
- the above-mentioned reaction can be performed using a known technique. That is, this reaction is carried out in an organic solvent such as an alcohol such as ethanol and isopropyl alcohol, an aromatic hydrocarbon such as toluene and xylene, an ether such as dioxane and THF, an aliphatic hydrocarbon and a chlorinated hydrocarbon. Performed in medium or without solvent.
- the reaction temperature is usually 50 to 150 ° C
- the reaction is carried out using a catalyst such as chloroplatinic acid, a complex obtained from chloroplatinic acid and an alcohol, a platinum refine complex, a platinum butylsiloxane complex, or a platinum phosphorus complex. be able to.
- the amount of the catalyst used is usually 1 to 500 ppm as platinum atom with respect to alkali polysiloxane, and is preferably 3 to 250 ppm in consideration of the curability and physical properties of the cured product! / ⁇ .
- the electromagnetic wave absorbing filler that can be blended with the crosslinked silicone gel of the present invention is not particularly limited as long as it has an electromagnetic wave absorbing function, and examples thereof include soft ferrite and flat soft magnetic metal powder. These can be used singly or in combination of two or more, and a composite filler containing a flame retardant in addition to these electromagnetic wave absorbers is preferable.
- the soft ferrite of the electromagnetic wave absorber which can be blended with the crosslinked silicone gel of the present invention exhibits a magnetic function even with a weak excitation current.
- soft flights include, but are not limited to, Ni—Zn ferrite, Mn—Zn ferrite, Mn—Mg ferrite, Cu—Zn ferrite, Ni—Zn—Cu ferrite, and Fe Ni—Zn—ferrite.
- Soft ferrites such as Cu-based, Fe Mg-Zn-Cu-based and Fe Mn-Zn-based can be cited. Among them, Ni-Zn-based ferrites are preferred in terms of balance of electromagnetic wave absorption characteristics, thermal conductivity, and price. Is preferred.
- the shape of the soft ferrite is not particularly limited, and may be a desired shape such as a spherical shape, a fibrous shape, and an irregular shape. In the present invention, filling at a high packing density is performed. It is preferable that the particles have a spherical shape, since higher thermal conductivity can be obtained.
- the particle size can be high, and the packing can be performed at a high packing density, and the compounding operation can be facilitated by preventing the aggregation of the particles.
- the particle size distribution D of the soft ferrite is 1 to 30 ⁇ m, preferably 1 to 10 ⁇ m.
- the electromagnetic wave absorption performance tends to decrease, and if it exceeds 30 m, the smoothness as an electromagnetic wave absorber deteriorates, which is not preferable.
- the particle size distribution D is a value having a small particle size obtained by a particle size distribution meter.
- the soft ferrite used in the present invention needs to be treated with a non-functional silane conjugate to suppress the effect of residual alkali ions present on the surface of the soft ferrite.
- Soft ferrite is used by mixing it into the silicone described below.However, residual alkali ions present on the surface of the soft ferrite may cause curing inhibition in the condensation or addition type curing mechanism of the silicone. If this occurs, the soft ferrite cannot be filled at a high level, and the soft filler that is further filled will not be sufficiently dispersed.
- the pH of the soft ferrite surface-treated with the non-functional group-based silane conjugate is 8.5 or less, preferably 8.2 or less.
- the pH of the soft ferrite is 8.5 or less, the inhibition of curing of silicone can be suppressed, and it can be applied to any silicone.
- the compatibility between soft ferrite and silicone is improved, and as a result, it is possible to increase the amount of soft filler in the silicone and at the same time increase the mixing property with the thermally conductive filler, thereby obtaining a uniform molded body. .
- Non-functional silane compounds for surface treatment of soft ferrite that can be used in the present invention include methyltrimethoxysilane, phenoltrimethoxysilane, diphenyldimethoxysilane, methyltriethoxysilane, dimethyldimethoxysilane. Silane, phenyltriethoxysilane And diphenylethoxysilane, isobutyltrimethoxysilane, decyltrimethoxysilane and the like. Of these, dimethyldimethoxysilane and methyltrimethoxysilane are preferred. In addition, these non-functional group-based silani conjugates can be used alone or in combination of two or more.
- silane compound for surface treatment of the soft ferrite of the present invention a general functional group-containing silane coupling agent used for the surface treatment of a filler such as a filler, for example, the surface of an epoxy-based silane compound or a butyl-based silane compound
- a treatment agent if the hardness changes such that the hardness increases in an environmental test under heating, cracks and the like due to thermal decomposition occur, the shape cannot be maintained, and the appearance is damaged.
- the method for treating the surface of the soft flight with the above-mentioned nonfunctional silane compound is not particularly limited, and an ordinary surface treatment method for an inorganic compound with a silane compound or the like can be used.
- the soft ferrite is about 5 immersed in Mechiruaru call solution weight 0/0 'mixing of dimethyldimethoxysilane, then to perform the hydrolysis treatment by adding water to the solution, the resulting treated product with a Henschel mixer, etc. It is obtained by crushing and mixing.
- the amount of the nonfunctional group-based silani conjugate is preferably about 0.2 to 10% by weight based on the soft ferrite.
- the flat soft magnetic metal powder of the electromagnetic wave absorber that can be blended with the crosslinked silicone gel of the present invention is a material having an effect of having stable energy conversion efficiency in a wide frequency band of MHz to 10 GHz.
- the flat soft magnetic metal powder is not particularly limited as long as it has soft magnetism and can be flattened by mechanical treatment. However, it has a high magnetic permeability and a low self-oxidizing property. It is desirable to have a high aspect ratio (value obtained by dividing the average particle size by the average thickness) in terms of shape.
- Specific metal powders include Fe Ni alloys, Fe Ni—Mo alloys, Fe Ni—Si—B alloys, Fe—Si alloys, 6-3-8 alloys, and 6-3 alloys.
- Soft magnetic metals such as Fe-Cr alloy, Fe-Cr-Si alloy, Co-Fe-Si-B alloy, A1-Ni-Cr Fe alloy, and Si-Ni-Cr-Fe alloy
- A is preferably a Si—Ni—CrFe alloy, particularly from the viewpoint of low self-oxidizing property. These may be used alone or in combination of two or more.
- the self-oxidizing property is determined by performing an exposure test in the atmosphere under heating and determining the weight change rate of the sample. Can. Exposure to the air at 200 ° C for 300 hours and a weight change ratio of 0.3% or less are preferable. If the flat soft magnetic metal powder has a low self-oxidizing property, even if a highly permeable silicone gel or the like is used as the binder resin, the magnetic properties will not deteriorate over time due to changes in surrounding environmental conditions such as humidity. Has features. Therefore, there is an advantage that any binder resin can be used.
- the average thickness of the flat soft magnetic metal powder is preferably 0.01—: L m. If the thickness is less than 0.01 ⁇ m, the dispersibility in the resin becomes poor, and the particles are not sufficiently aligned in one direction even when subjected to an orientation treatment using an external magnetic field. Even with materials of the same composition, magnetic properties such as magnetic permeability are reduced, and magnetic shield properties are also reduced. Conversely, if the average thickness exceeds 1 m, the filling rate decreases. Further, since the aspect ratio is reduced, the influence of the demagnetizing field is increased, and the magnetic permeability is reduced, resulting in insufficient shielding characteristics.
- the particle size distribution D of the flat soft magnetic metal powder is preferably 8 to 42 ⁇ m. Particle size distribution D
- the particle size distribution D is the small value of the particle size obtained by the particle size distribution meter.
- the specific surface area of the flat soft magnetic metal powder is preferably 0.8 to 1.2 m 2 / g. Since the flat soft magnetic metal powder is a material that performs an energy conversion function by electromagnetic induction, the higher the specific surface area, the higher the energy conversion efficiency can be maintained. However, the larger the specific surface area, the lower the mechanical strength. Therefore, it is necessary to select an optimal range. If the specific surface area is less than 0.8 m 2 Zg, high filling is possible, but the energy exchange function is low. If the specific surface area is more than 1.2 m 2 Zg, mechanical mixing makes it easy to break, making it difficult to maintain the shape, and high filling Even so, energy exchange is low.
- the specific surface area is a value measured by a BET measuring device.
- the aspect ratio is preferably 17-20 S, and the tap density is preferably 0.55-0.75 g / ml. Good. Further, it is preferable that an antioxidant is applied to the surface of the flat metal powder.
- the flat soft magnetic metal powder used in the present invention is preferably used after microencapsulation.
- the flat soft magnetic metal powder is mixed with soft ferrite or the like, the dielectric breakdown strength is easily reduced in addition to the volume resistance.
- microencapsulation it is possible to prevent the decrease in the dielectric breakdown strength and at the same time to improve the strength.
- the method of microencapsulation is not particularly limited, and a material that covers the surface of the flat soft magnetic metal powder to a certain thickness and does not hinder the energy change of the flat soft magnetic metal powder. Any method may be used as long as the method is used.
- gelatin is used as a material for coating the surface of the flat soft magnetic metal powder, and the soft magnetic metal powder is dispersed in a toluene solution of gelatin dissolved therein.
- a microencapsulated product having a weight ratio of gelatin of 20% and a flat soft magnetic metal powder of about 80% is obtained as a particle having a particle size of about 100 ⁇ m, and an electromagnetic wave absorber using the same is obtained.
- the dielectric breakdown strength can be improved to about twice that in the case where microcapsulation is not performed.
- magnetite is preferred. Magnetite is an iron oxide (Fe 2 O 3)
- the electromagnetic wave absorbing material 34 when used together with the ferrite and Z or the flat soft magnetic metal powder, imparts flame retardancy to the electromagnetic wave absorbing material, improves the thermal conductivity, and furthermore, has a synergistic effect of magnetite with magnetic properties. Thereby, the electromagnetic wave absorbing effect of the entire electromagnetic wave absorbing material can be improved.
- the particle size distribution D of magnetite is preferably 0.1 to 0.4 ⁇ m. Magnetite grains
- the particle size distribution D of magnetite is 0.1 ⁇ m.
- the particle size distribution D is the small value of the particle size obtained by the particle size distribution meter.
- the shape of the magnetite is not particularly limited, and may be a desired shape such as a spherical shape, a fibrous shape, and an irregular shape.
- a desired shape such as a spherical shape, a fibrous shape, and an irregular shape.
- octahedral fine particles are preferable.
- magnetite is octahedral fine particles, the specific surface area is large and the effect of imparting flame retardancy is high!
- a composite agent of a combination of soft ferrite and magnetite surface-treated with a non-functional silane compound is used as a filler for electromagnetic wave absorption.
- a combination of 60 to 90% by weight of soft ferrite and 3 to 25% by weight of magnetite surface-treated with a base silane conjugate is preferably used for high resistance and high insulation applications.
- a composite agent of a combination of flat soft magnetic metal powder and magnetite is used as the electromagnetic wave absorbing filler
- a combination of flat soft magnetic metal powder 60 to 70% by weight and magnetite 3 to 10% by weight is preferable.
- Preferable Used in applications with high electromagnetic wave absorption characteristics in the 2-4 GHz frequency band.
- the amount of the electromagnetic wave absorbing filler to be added to the crosslinked silicone gel is 200 to 800 parts by weight based on 100 parts by weight of the crosslinked silicone gel. If the amount of the electromagnetic wave absorbing filler is less than 200 parts by weight, the energy conversion efficiency is poor. Force Extrusion is not preferred.
- the extrudable crosslinked grease-like electromagnetic wave absorbing material of the present invention is a composite material in which a filler for electromagnetic wave absorption is dispersed in a matrix of a crosslinked silicone gel.
- a filler for electromagnetic wave absorption is dispersed in a matrix of a crosslinked silicone gel.
- inorganic filler such as ferrite, flat soft magnetic metal powder, and magnetite.
- Roll kneading, Banbari kneading, and kneader kneading become difficult, and even if kneading is performed, the viscosity of the compound tends to increase.However, by treating the surface of soft ferrite with a nonfunctional group-based silane conjugate, , Kneading and the like can be easily performed.
- the crosslinked grease-like electromagnetic wave absorbing material of the present invention When the grease-like crosslinked electromagnetic wave absorbing material of the present invention is used, the crosslinked grease-like electromagnetic wave absorbing material that can be extruded is filled. * Container force of a sealed syringe or the like. Use it by applying it to a location or pouring it into the space.
- the grease-like cross-linked electromagnetic wave absorbing material used in the present invention also has a self-retaining property, so that even after application, even if it is held under a slight load such as an inclined state, the shape remains as it is. Has features that can be kept.
- cross-linked t means that the product is of a type based on a technical idea different from that of uncross-linked silicone resin, which is conventionally used.
- extrudable refers to the force of a container such as a syringe filled with it, which can be extruded and used, even if the shape of the object to be extruded and applied is any shape. Means to allow the use of either pushing or applying.
- the extrudable crosslinked grease-like electromagnetic wave absorbing material of the present invention can be used by filling and enclosing a container in an extrudable state.
- the container is represented by a syringe, a tube, or the like, and has a fluid storage portion, a fluid inlet, a fluid outlet, a piston, an impeller, a cap, a seal, etc. for injecting or ejecting a fluid, and can store fluid.
- the container is not particularly limited as long as it has a function capable of injecting and Z or discharging an arbitrary amount of fluid.
- a type having a fluid inlet and a fluid outlet a type having both a fluid inlet and a fluid outlet and having only one port, and having a fluid inlet and a fluid outlet at the beginning.
- the fluid inlet is closed after the fluid has been injected, leaving only the fluid outlet.
- a type that seals both after injecting fluid while having a body inlet and a fluid outlet, and a means to seal the fluid inlet and fluid outlet is a stopper, a cap with a rotating groove, a heat seal, and a seal sticker.
- There are various types such as a type that can be selected.
- the container includes a heating means, a cooling means, a decompression means, a pressure means, a suction means, an evaporation means, a motor, a hydraulic means, a pneumatic means, a weighing means, a dustproof means, a handling auxiliary means, a display means.
- a means for releasing generated gas, a means for preventing backflow, a means for detecting temperature, etc. may be provided.
- Most frequently used are containers in the form of syringes and tubes.
- the method of filling and enclosing the crosslinked silicone gel and the electromagnetic wave absorbing filler in the container is not particularly limited. The following two methods can be exemplified.
- the mixture is heated to form a bridged grease-like electromagnetic wave.
- the crosslinked grease-like electromagnetic wave absorbing material is filled and sealed in a container.
- the raw material of the crosslinked silicone gel and the filler for electromagnetic wave absorption can be mixed and heated in a large container in a large amount, so that production with good production efficiency can be performed.
- the extrudable cross-linked grease-like electromagnetic wave absorbing material of the present invention also extrudes the outlet force of the filled and sealed container, and forms a thin film around the heat-dissipating opening (slit, etc.) of the housing for housing the electronic device. To suppress the radiation of unnecessary electromagnetic waves from the heat radiation openings.
- the Examples of the device having the heat dissipation opening include a personal computer (PC), a DVD drive, and a television (TV).
- Diffusion phenomenon (bleeding phenomenon) test method Put 50g of cross-linked grease-like electromagnetic wave absorbing material between two glass plates, apply pressure so that the distance between the two glass plates is 2mm, and cross-link. The thickness of the used dully-shaped electromagnetic wave absorbing material was set to 2 mm, and thereafter, it was installed in a horizontal state and an inclined state without applying pressure. Next, a continuous test was conducted in an environmental tester at 4 ° C for 30 minutes and at 100 ° C for 30 minutes for 300 hours, and then the state of the electromagnetic wave absorbing material was confirmed.
- Magnetic loss Magnetic permeability: Measured using a magnetic permeability & induction ratio measurement system (S-parameter type coaxial tube er, r measuring system manufactured by Anritsu & Keycom).
- Dielectric breakdown strength Measured according to JIS K 6249.
- Heat resistance Leave at 150 ° C constant temperature, measure the penetration and thermal conductivity, and observe changes over time. Time until change is observed.
- Addition-reaction type silicone gel (SI G5000 (product name): Shin-Etsu Chemical Co., Ltd.) that can cure to a consistency (JIS K2220 1Z4 cone) 130% by weight, particle size distribution D 1-10 m
- Ni-Zn soft ferrite (BSN-714 (trade name) manufactured by Toda Kogyo Co., Ltd.) surface-treated with methyltrimethoxysilane 83% by weight of soft ferrite, particle size distribution D 0.1
- Table 1 shows the evaluation results of the crosslinked grease-like electromagnetic wave absorbing material.
- the magnetic loss was measured in the range from 0.5 to 10 GHz, and was A shown in Fig. 1.
- Addition-reaction type silicone gel (SI G5000 (product name): Shin-Etsu Chemical Co., Ltd.) that can be cured to a consistency (JIS K2220 1Z4 cone) 130% by weight, particle size distribution D 1-10 m
- Ni-Zn soft ferrite (BSN-714 (trade name) manufactured by Toda Kogyo Co., Ltd.) surface-treated with methyltrimethoxysilane 50 wt% soft ferrite, particle size distribution D8-42 / ⁇ , self-acid
- magnetite fine particles KN-320 (trade name), manufactured by Toda Kogyo Co., Ltd.
- KN-320 trade name
- the syringe was filled under vacuum defoaming, and the entire syringe was heated and crosslinked at 80 ° C. for 30 minutes to obtain a syringe filled and sealed with the crosslinked grease-like electromagnetic wave absorbing material of the present invention.
- the piston of this syringe was lightly pressed with the thumb, the crosslinked grease-like electromagnetic wave absorbing material could be discharged from the spout.
- the crosslinked grease-like electromagnetic wave absorbing material was tested and evaluated by the above method.
- Table 1 shows the evaluation results of the crosslinked grease-like electromagnetic wave absorbing material.
- the magnetic loss was measured in the range from 0.5 to 10 GHz, and was B shown in Fig. 1.
- Comparative Example 1 Without surface treatment, soft ferrite was added to the silicone gel used in Example 1 to perform a hardening test. Table 1 shows the evaluation results. When the amount of soft ferrite added was 20% by weight, hardening was inhibited and the magnetic loss (1 GHz) that prevented crosslinking was as low as 0.5.
- An electromagnetic wave absorbing material was obtained and evaluated in the same manner as in Example 1, except that soft ferrite in which the surface treatment was performed with epoxytrimethoxysilane, which was a functional group-based silani conjugate, was used. Table 1 shows the evaluation results. Heat resistance was low, less than 1000 hours.
- Example 2 An electromagnetic wave absorbing material was obtained and evaluated in the same manner as in Example 1 except that the silicone gel was not crosslinked. Table 1 shows the evaluation results.
- the test result of the diffusion phenomenon (bleeding phenomenon) similar to that in Example 1 showed that the diffusion phenomenon (bleeding phenomenon) was observed in the case of the horizontal state, without the periphery staying at the same position. Moreover, in the case of the inclined state, the dripping phenomenon was also recognized. Further, a change with the passage of time was observed due to the lack of cross-linking.
- An electromagnetic wave absorber was obtained and evaluated in the same manner as in Example 2 except that the silicone gel was not crosslinked. Table 1 shows the evaluation results. As in Comparative Example 3, a diffusion phenomenon (bleeding phenomenon), a dripping phenomenon, and a change with time were observed.
- the extrudable cross-linked grease-like electromagnetic wave absorbing material of the present invention can uniformly enclose the electromagnetic wave absorbing filler in the cross-linked silicone gel, so that even if the blending amount is large, it is not separated or unevenly distributed.
- the ability to absorb electromagnetic waves can be increased.
- tubes and It can be placed in a container such as a syringe, and it is possible to grasp the tube with your hand or push out the syringe piston with a weak force enough to push it with the force of air.After pushing out, apply force and make it into an arbitrary shape
- the diffusion property (blur phenomenon) does not occur in the equipment to which it is applied, and the property that the shape can be maintained as long as it is left as it is even if it is held in an inclined state (self (Shape retention), and has the characteristic of little change over time due to cross-linking. Therefore, it is possible to reduce the radiation efficiency of noise by simply applying a thin coating to absorb unnecessary electromagnetic waves around the opening of the housing, compared to the conventional method that required secondary processing and complicated bonding work. This can be linked to significant cost reduction.
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- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
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Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/590,853 US20080258119A1 (en) | 2004-03-30 | 2004-10-20 | Squeezable, Cross-Linked, Grease-Like Electromagnetic Wave Absorber |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004099880A JP2005286195A (ja) | 2004-03-30 | 2004-03-30 | 押出し可能な架橋済グリース状電磁波吸収材、これを充填・封入した容器、その容器の製法、及びこれらを利用した電磁波吸収方法 |
JP2004-099880 | 2004-03-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005101942A1 true WO2005101942A1 (ja) | 2005-10-27 |
Family
ID=35150387
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/015489 WO2005101942A1 (ja) | 2004-03-30 | 2004-10-20 | 押出し可能な架橋済グリース状電磁波吸収材 |
Country Status (6)
Country | Link |
---|---|
US (1) | US20080258119A1 (ja) |
JP (1) | JP2005286195A (ja) |
KR (1) | KR20070007311A (ja) |
CN (1) | CN1926935A (ja) |
TW (1) | TWI285528B (ja) |
WO (1) | WO2005101942A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8864929B2 (en) * | 2006-10-31 | 2014-10-21 | Dexerials Corporation | Method for manufacturing laminated soft-magnetic sheet |
EP3919557A4 (en) * | 2019-03-28 | 2022-10-26 | Sekisui Polymatech Co., Ltd. | SILICONE COMPOSITION AND HARDENABLE GREASE |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009081234A (ja) * | 2007-09-26 | 2009-04-16 | Nitta Ind Corp | 難燃性磁性シートおよびそれを用いたrfidデバイス並びにrfid無線通信を改善する方法 |
JP2009088237A (ja) * | 2007-09-28 | 2009-04-23 | Nitta Ind Corp | 電磁干渉抑制体およびそれを用いた電磁障害抑制方法 |
CN105838117B (zh) * | 2016-04-27 | 2018-03-16 | 戴雨兰 | 一种无底材磁性闪光颜料及其制备方法和应用 |
CN110088854B (zh) * | 2016-12-19 | 2021-08-06 | 山阳特殊制钢株式会社 | 软磁性扁平粉末 |
EP3606309B1 (en) * | 2017-03-30 | 2023-09-06 | FUJIFILM Corporation | Electromagnetic wave absorber and method for producing electromagnetic wave absorber |
US10669436B1 (en) * | 2018-11-16 | 2020-06-02 | Conductive Composites Company Ip, Llc | Multifunctional paints and caulks with controllable electromagnetic properties |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0640301A (ja) * | 1992-07-22 | 1994-02-15 | Toyo Tire & Rubber Co Ltd | 難燃性および耐炎性の改善されたエアバッグの製造方法 |
JPH1154985A (ja) * | 1997-08-05 | 1999-02-26 | Tokin Corp | 複合磁性ペースト |
JPH11258623A (ja) * | 1998-03-13 | 1999-09-24 | Toshiba Corp | 平面表示装置 |
JP2002072668A (ja) * | 2000-09-04 | 2002-03-12 | Canon Inc | 現像剤担持体及び現像装置 |
JP2002217586A (ja) * | 2001-01-22 | 2002-08-02 | Sony Corp | 電波吸収体 |
JP2002296940A (ja) * | 2001-03-29 | 2002-10-09 | Ge Toshiba Silicones Co Ltd | 熱定着ロール用シリコーンゴム組成物 |
EP1372162A1 (en) * | 2001-03-21 | 2003-12-17 | Shin-Etsu Chemical Company, Ltd. | Electromagnetic wave absorbing thermally conductive composition and thermosoftening electromagnetic wave absorbing heat dissipation sheet and method of heat dissipation work |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1273994C (zh) * | 2001-04-06 | 2006-09-06 | 世界财产股份有限公司 | 导电性有机硅及其制造方法 |
-
2004
- 2004-03-30 JP JP2004099880A patent/JP2005286195A/ja active Pending
- 2004-10-20 KR KR1020067018213A patent/KR20070007311A/ko not_active Application Discontinuation
- 2004-10-20 CN CNA2004800424338A patent/CN1926935A/zh active Pending
- 2004-10-20 US US10/590,853 patent/US20080258119A1/en not_active Abandoned
- 2004-10-20 WO PCT/JP2004/015489 patent/WO2005101942A1/ja active Application Filing
-
2005
- 2005-03-25 TW TW094109237A patent/TWI285528B/zh not_active IP Right Cessation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0640301A (ja) * | 1992-07-22 | 1994-02-15 | Toyo Tire & Rubber Co Ltd | 難燃性および耐炎性の改善されたエアバッグの製造方法 |
JPH1154985A (ja) * | 1997-08-05 | 1999-02-26 | Tokin Corp | 複合磁性ペースト |
JPH11258623A (ja) * | 1998-03-13 | 1999-09-24 | Toshiba Corp | 平面表示装置 |
JP2002072668A (ja) * | 2000-09-04 | 2002-03-12 | Canon Inc | 現像剤担持体及び現像装置 |
JP2002217586A (ja) * | 2001-01-22 | 2002-08-02 | Sony Corp | 電波吸収体 |
EP1372162A1 (en) * | 2001-03-21 | 2003-12-17 | Shin-Etsu Chemical Company, Ltd. | Electromagnetic wave absorbing thermally conductive composition and thermosoftening electromagnetic wave absorbing heat dissipation sheet and method of heat dissipation work |
JP2002296940A (ja) * | 2001-03-29 | 2002-10-09 | Ge Toshiba Silicones Co Ltd | 熱定着ロール用シリコーンゴム組成物 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8864929B2 (en) * | 2006-10-31 | 2014-10-21 | Dexerials Corporation | Method for manufacturing laminated soft-magnetic sheet |
EP3919557A4 (en) * | 2019-03-28 | 2022-10-26 | Sekisui Polymatech Co., Ltd. | SILICONE COMPOSITION AND HARDENABLE GREASE |
Also Published As
Publication number | Publication date |
---|---|
TW200605772A (en) | 2006-02-01 |
US20080258119A1 (en) | 2008-10-23 |
JP2005286195A (ja) | 2005-10-13 |
KR20070007311A (ko) | 2007-01-15 |
TWI285528B (en) | 2007-08-11 |
CN1926935A (zh) | 2007-03-07 |
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