JP6614127B2 - 導電性銀ペースト - Google Patents
導電性銀ペースト Download PDFInfo
- Publication number
- JP6614127B2 JP6614127B2 JP2016502560A JP2016502560A JP6614127B2 JP 6614127 B2 JP6614127 B2 JP 6614127B2 JP 2016502560 A JP2016502560 A JP 2016502560A JP 2016502560 A JP2016502560 A JP 2016502560A JP 6614127 B2 JP6614127 B2 JP 6614127B2
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- JP
- Japan
- Prior art keywords
- conductive
- rubber
- powder
- silver paste
- coating film
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 title claims description 84
- 238000000576 coating method Methods 0.000 claims description 47
- 229920001971 elastomer Polymers 0.000 claims description 47
- 239000011248 coating agent Substances 0.000 claims description 46
- 239000000843 powder Substances 0.000 claims description 39
- 239000005060 rubber Substances 0.000 claims description 39
- 125000002560 nitrile group Chemical group 0.000 claims description 36
- 238000011156 evaluation Methods 0.000 claims description 22
- 229910052783 alkali metal Inorganic materials 0.000 claims description 21
- 150000001340 alkali metals Chemical class 0.000 claims description 20
- 229920000459 Nitrile rubber Polymers 0.000 claims description 17
- 229910052709 silver Inorganic materials 0.000 claims description 13
- 239000004332 silver Substances 0.000 claims description 13
- 229920006168 hydrated nitrile rubber Polymers 0.000 claims description 11
- 239000004020 conductor Substances 0.000 claims description 8
- 230000008602 contraction Effects 0.000 claims description 6
- 239000010408 film Substances 0.000 description 59
- 238000009835 boiling Methods 0.000 description 28
- 238000000034 method Methods 0.000 description 22
- 239000000463 material Substances 0.000 description 21
- 239000002245 particle Substances 0.000 description 18
- 230000005012 migration Effects 0.000 description 16
- 238000013508 migration Methods 0.000 description 16
- 238000003860 storage Methods 0.000 description 16
- 229920005989 resin Polymers 0.000 description 13
- 239000011347 resin Substances 0.000 description 13
- 230000007774 longterm Effects 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 11
- 239000002585 base Substances 0.000 description 11
- 230000008859 change Effects 0.000 description 9
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- 229910021641 deionized water Inorganic materials 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
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- 238000005406 washing Methods 0.000 description 5
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- 230000008569 process Effects 0.000 description 4
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 3
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- 229920006362 Teflon® Polymers 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
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- 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 2
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 2
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 2
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 2
- 229910001312 Amalgam (dentistry) Inorganic materials 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 2
- 239000005062 Polybutadiene Substances 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- FOIXSVOLVBLSDH-UHFFFAOYSA-N Silver ion Chemical compound [Ag+] FOIXSVOLVBLSDH-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
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- 239000007864 aqueous solution Substances 0.000 description 2
- 238000000149 argon plasma sintering Methods 0.000 description 2
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- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 2
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- 125000004122 cyclic group Chemical group 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- 239000004205 dimethyl polysiloxane Substances 0.000 description 2
- LQZZUXJYWNFBMV-UHFFFAOYSA-N dodecan-1-ol Chemical compound CCCCCCCCCCCCO LQZZUXJYWNFBMV-UHFFFAOYSA-N 0.000 description 2
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- 239000011630 iodine Substances 0.000 description 2
- 229910052740 iodine Inorganic materials 0.000 description 2
- HQKMJHAJHXVSDF-UHFFFAOYSA-L magnesium stearate Chemical compound [Mg+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O HQKMJHAJHXVSDF-UHFFFAOYSA-L 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
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- 229910052700 potassium Inorganic materials 0.000 description 2
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- 239000000454 talc Substances 0.000 description 2
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- DAFHKNAQFPVRKR-UHFFFAOYSA-N (3-hydroxy-2,2,4-trimethylpentyl) 2-methylpropanoate Chemical compound CC(C)C(O)C(C)(C)COC(=O)C(C)C DAFHKNAQFPVRKR-UHFFFAOYSA-N 0.000 description 1
- BQCIDUSAKPWEOX-UHFFFAOYSA-N 1,1-Difluoroethene Chemical compound FC(F)=C BQCIDUSAKPWEOX-UHFFFAOYSA-N 0.000 description 1
- FQYVVSNFPLKMNU-UHFFFAOYSA-N 1,2-dipentylbenzene Chemical compound CCCCCC1=CC=CC=C1CCCCC FQYVVSNFPLKMNU-UHFFFAOYSA-N 0.000 description 1
- INZDTEICWPZYJM-UHFFFAOYSA-N 1-(chloromethyl)-4-[4-(chloromethyl)phenyl]benzene Chemical compound C1=CC(CCl)=CC=C1C1=CC=C(CCl)C=C1 INZDTEICWPZYJM-UHFFFAOYSA-N 0.000 description 1
- QIJNJJZPYXGIQM-UHFFFAOYSA-N 1lambda4,2lambda4-dimolybdacyclopropa-1,2,3-triene Chemical compound [Mo]=C=[Mo] QIJNJJZPYXGIQM-UHFFFAOYSA-N 0.000 description 1
- YAJYJWXEWKRTPO-UHFFFAOYSA-N 2,3,3,4,4,5-hexamethylhexane-2-thiol Chemical compound CC(C)C(C)(C)C(C)(C)C(C)(C)S YAJYJWXEWKRTPO-UHFFFAOYSA-N 0.000 description 1
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- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 235000019359 magnesium stearate Nutrition 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- UNASZPQZIFZUSI-UHFFFAOYSA-N methylidyneniobium Chemical compound [Nb]#C UNASZPQZIFZUSI-UHFFFAOYSA-N 0.000 description 1
- NFFIWVVINABMKP-UHFFFAOYSA-N methylidynetantalum Chemical compound [Ta]#C NFFIWVVINABMKP-UHFFFAOYSA-N 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- WVDDGKGOMKODPV-ZQBYOMGUSA-N phenyl(114C)methanol Chemical compound O[14CH2]C1=CC=CC=C1 WVDDGKGOMKODPV-ZQBYOMGUSA-N 0.000 description 1
- 229920002120 photoresistant polymer Polymers 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000011295 pitch Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000002685 polymerization catalyst Substances 0.000 description 1
- 239000003505 polymerization initiator Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
- LLHKCFNBLRBOGN-UHFFFAOYSA-N propylene glycol methyl ether acetate Chemical compound COCC(C)OC(C)=O LLHKCFNBLRBOGN-UHFFFAOYSA-N 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 description 1
- HIEHAIZHJZLEPQ-UHFFFAOYSA-M sodium;naphthalene-1-sulfonate Chemical compound [Na+].C1=CC=C2C(S(=O)(=O)[O-])=CC=CC2=C1 HIEHAIZHJZLEPQ-UHFFFAOYSA-M 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- VEALVRVVWBQVSL-UHFFFAOYSA-N strontium titanate Chemical compound [Sr+2].[O-][Ti]([O-])=O VEALVRVVWBQVSL-UHFFFAOYSA-N 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 229920000468 styrene butadiene styrene block copolymer Polymers 0.000 description 1
- 229920001935 styrene-ethylene-butadiene-styrene Polymers 0.000 description 1
- 150000004763 sulfides Chemical class 0.000 description 1
- 238000010558 suspension polymerization method Methods 0.000 description 1
- 229910003468 tantalcarbide Inorganic materials 0.000 description 1
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 1
- UWHCKJMYHZGTIT-UHFFFAOYSA-N tetraethylene glycol Chemical compound OCCOCCOCCOCCO UWHCKJMYHZGTIT-UHFFFAOYSA-N 0.000 description 1
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000013008 thixotropic agent Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 229910003470 tongbaite Inorganic materials 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- JLGLQAWTXXGVEM-UHFFFAOYSA-N triethylene glycol monomethyl ether Chemical compound COCCOCCOCCO JLGLQAWTXXGVEM-UHFFFAOYSA-N 0.000 description 1
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
- ZVWKZXLXHLZXLS-UHFFFAOYSA-N zirconium nitride Chemical compound [Zr]#N ZVWKZXLXHLZXLS-UHFFFAOYSA-N 0.000 description 1
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- C09D11/02—Printing inks
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Description
ヘルスケアの分野においても、高い伸縮性を示す導電材料が望まれる。例えば、伸縮性の導電材料の膜を用いることによって、柔軟で曲線状である人体に密着して適合できるデバイスを開発することが可能となる。これらのデバイスの用途は、電気生理学的信号の測定から、先進治療のデリバリーや、人と機械のインターフェースにまで及ぶ。
すなわち、本発明は以下の(1)〜(6)の構成からなる。
(1)銀粉(A)とニトリル基を含有するゴム(B)を含み、(A)/(B)の重量比が77/23〜90/10の範囲であり、該銀粉(A)は不定形凝集粉および/またはフレーク状粉で、該ニトリル基を含有するゴム(B)はアルカリ金属含有量が4000ppm以下であることを特徴とする導電性銀ペースト。
(2)ニトリル基を含有するゴム(B)はアクリロニトリル−ブタジエンゴムおよび/または水素化アクリロニトリル−ブタジエンゴムで、かつ二トリル基含有量が25重量%以上あることを特徴とする請求項1に記載の導電性銀ペースト。
(3)ニトリル基を含有するゴム(B)はアルカリ金属含有量が1500ppm以下であることを特徴とする請求項1又は2に記載の導電性銀ペースト。
(4)銀粉(A)は不定形凝集粉であることを特徴とする請求項1〜3のいずれかに記載の導電性銀ペースト。
(5)比抵抗が1.0×10-3(Ω・cm)未満である塗膜を形成できることを特徴とする請求項1〜4のいずれかに記載の導電性銀ペースト。
(6)破断伸度が35%よりも大きく、かつ伸長率20%で繰返し伸縮性評価を行った際に50回以上の繰返し伸縮で破断を発生しない塗膜を形成できることを特徴とする請求項1〜5のいずれかに記載の導電性銀ペースト。
本発明の導電性銀ペーストは銀粉(A)とニトリル基を含有するゴム(B)を含み、(A)/(B)の重量比が77/23〜90/10の範囲であり、銀粉(A)は不定形凝集粉および/またはフレーク状粉でニトリル基を含有するゴム(B)はアルカリ金属含有量が4000ppm以下であることを特徴とする。ニトリル基を含有するゴム(B)のアルカリ金属含有量を低減させることで導電性銀ペーストの擬似的架橋による経時的な粘度上昇が抑制され、長期保存安定性が向上する。また、金属イオン源の低減から導電性塗膜とした場合の耐マイグレーション性も改善される。銀粉と親和性に優れる二トリル基が優先的に銀粉表面に吸着することで塗膜内の銀粉とニトリル基を含有するゴムが完全な均一分散状態にならず、海島構造のような偏在化、不均一化が生じる。このため、銀粉が低充填量であるにもかかわらず、導電性ネットワークを形成しやすくなる。銀粉の低充填量化によるゴム成分の増加で良好な伸長性、繰返し伸縮性を発現できる。
以下に好ましい形態について述べる。
得られた樹脂材料をNMR分析して得られた組成比から、モノマーの重量比による重量%に換算した。
樹脂を灰化処理し、得られた灰分を塩酸抽出し、原子吸光法にてナトリウム、カリウムの含有量を求め、両者を合計した。
自然状態(伸長率0%)の導電塗膜のシート抵抗と膜厚を測定し、比抵抗を算出した。膜厚はシックネスゲージ SMD−565L(TECLOCK社製)を用い、シート抵抗はLoresta−GP MCP−T610(三菱化学アナリテック社製)を用いて試験片4枚について測定し、その平均値を用いた。
そして自然状態(伸長率0%)と同様にして、下記4.の方法にて伸長し、伸長率40%、60%、100%時の比抵抗を測定した。なお、伸長時の比抵抗は、所定の伸長度に達してから30秒後の値を読み取った。比抵抗は以下の式により算出した。
比抵抗(Ω・cm)=Rs(Ω/□)×t(cm)
ここで、Rsは各条件で測定されたシート抵抗、tは各条件で測定された膜厚を示す。
試料膜を幅20mm、長さ50mmにカットして試験片を作成した。万能試験機(島津製作所製、オートグラフAG−IS)を用いて伸長速度60mm/分にて長さ方向に伸長し、伸長率は以下の式により算出した。
伸長率(%)=(ΔL0/L0)×100
ここで、L0は試験片の標線間距離、ΔL0は試験片の標線間距離の増加分を示す。
繰返し耐久試験機(レスカ社製、TIQ−100)を用い、試料膜を元の長さの20%伸長した状態及び元の長さに戻した状態とすることを繰り返す伸長率20%での繰返伸縮を50回、100回、1000回繰り返した後の元の長さに戻した状態(伸長率0%)での比抵抗を測定し、比抵抗変化率を以下の式により算出した。なお、伸長速度及び元の長さに戻す速度は、ともに60mm/分とした。
厚み100μmのアニール処理ポリエステルフィルム上に導電性銀ペーストを図1に示す中央に1.5mmのギャップのある線幅2.0mm、長さ85.5mmのパターンを乾燥膜厚が10μmになるようにスクリーン印刷し、150℃/30分で熱処理したものを試料とした。ついで上記ギャップ間に注射器(ニプロシリンジ1ml(ニプロ(株)製)で蒸留水0.4mlをゆるやかに滴下し、定電圧電源(高砂製作所(株)製)10V印加し、デジタルマルチメーター(武田理研(株)製)で電流値を測定し、電流値が0.1mAになるまでの時間を測定し、5回の測定値の平均値で評価した。数値が大きいほど耐マイグレーション性は良好である。
導電性銀ペーストをE型粘度計で25℃、5rpmで測定開始から3分後の粘度を初期粘度とした。その後、導電性銀ペーストを25℃保管し、3ヶ月後の粘度を測定した。粘度測定の直前にガラス棒で30回手練した。粘度変化率は以下の式により算出した。
粘度変化率=(V―V0)/V0×100(%)
ここで、Vは25℃保管で3ヶ月後の粘度、R0は初期粘度を示す。長期保存安定性は以下の基準で判定した。
粘度変化率が20%未満の場合:○
粘度変化率が20%以上、40%未満の場合:△
粘度変化率が40%以上の場合:×
HNBRのヨウ素価は、JIS K6235に準じて、測定した。
攪拌機、水冷ジャケットを備えたステンレス鋼製の反応容器に
ブタジエン 49重量部
アクリロニトリル 51重量部
脱イオン水 270重量部
ドデシルベンゼンスルホン酸ナトリウム 0.5重量部
ナフタレンスルホン酸ナトリウム縮合物 2.5重量部
t−ドデシルメルカプタン 0.3重量部
トリエタノールアミン 0.2重量部
炭酸ナトリウム 0.1重量部
を仕込み、窒素を流しながら浴温度を15℃に保ち、静かに攪拌した。次いで 過硫酸カリウム0.3重量部を脱イオン水19.7重量部に溶解した水溶液を30分間かけて滴下し、さらに20時間反応を継続した後、ハイドロキノン0.5重量部を脱イオン水19.5重量部に溶解した水溶液を加えて重合停止操作を行った。
次いで、未反応モノマーを留去させるために、まず反応容器内を減圧し、さらにスチームを導入して未反応モノマーを回収し、得られたラテックスに食塩と希硫酸を加えて凝集・濾過し、樹脂に対する体積比20倍量の脱イオン水を5回に分けて樹脂を脱イオン水に再分散、濾過を繰り返すことで洗浄し、空気中にて乾燥してNBR(1)を得た。
得られたNBR(1)の評価結果を表1.に示す。
製造例1に対して、洗浄工程を変更したものである。樹脂に対する体積比4倍量の脱イオン水に1回のみ、再分散、濾過を実施し、空気中にて乾燥してNBR(2)を得た。得られ
た評価結果を表1.に示す。
製造例1に対し、洗浄工程を実施しないことでNBR(3)を得た。得られた評価結果を表
1.に示す。
製造例1に対して、水素化処理を実施し、HNBR(1)を得た。評価結果を表1に示す。
<導電性銀ペーストの作製>
二トリル基を含有するゴムをイソホロンに溶解させて、この溶液に銀粉を混練した混合物を、各成分が表2、3に記載の重量比となるように配合し、3本ロールミルにて混練して、導電性銀ペーストを得た。
厚さ1mmの伸縮性のウレタンシートまたはテフロン(登録商標)シート上にアプリケーターにて導電性銀ペーストを塗布し、150℃で30分間乾燥し、膜厚100μmの導電塗膜を有するシートを作製した。伸長率はテフロン(登録商標)シートから導電塗膜を剥離したもので評価を実施した。繰返し伸縮性はウレタンシート上に形成された導電塗膜をウレタンシートとともに評価した。
1)銀粉:不定形凝集粉G−35(平均粒径5.9μm、DOWAエレクトロニクス社製)
2)銀粉:フレーク状粉FA−D−3(平均粒径6.9μm、DOWAエレクトロニクス社製)
3)銀粉:球状粉AG3−8F(平均粒径1.6μm、DOWAエレクトロニクス社製)4)その他の樹脂:共重合ポリエステル樹脂RV300(東洋紡(株)製)
Claims (6)
- 銀粉(A)とニトリル基を含有するゴム(B)を含み、(A)/(B)の重量比が77/23〜90/10の範囲であり、該銀粉(A)は不定形凝集粉および/またはフレーク状粉で、該ニトリル基を含有するゴム(B)はアルカリ金属含有量が4000ppm以下であることを特徴とする導電性銀ペースト。
- ニトリル基を含有するゴム(B)はアクリロニトリル−ブタジエンゴムおよび/または水素化アクリロニトリル−ブタジエンゴムで、かつ二トリル基含有量が25重量%以上あることを特徴とする請求項1に記載の導電性銀ペースト。
- ニトリル基を含有するゴム(B)はアルカリ金属含有量が1500ppm以下であることを特徴とする請求項1又は2に記載の導電性銀ペースト。
- 銀粉(A)は不定形凝集粉であることを特徴とする請求項1〜3のいずれかに記載の導電性銀ペースト。
- 比抵抗が1.0×10−3(Ω・cm)未満である塗膜を形成できることを特徴とする請求項1〜4のいずれかに記載の導電性銀ペースト。
- 破断伸度が35%よりも大きく、かつ伸長率20%で繰返し伸縮性評価を行った際に50回以上の繰返し伸縮で破断を発生しない塗膜を形成できることを特徴とする請求項1〜5のいずれかに記載の導電性銀ペースト。
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JP7063271B2 (ja) * | 2016-10-18 | 2022-05-09 | 東洋紡株式会社 | 伸縮性導体シート、伸縮性配線、伸縮性配線付き布帛、および導電性回復方法 |
JP6889902B2 (ja) * | 2016-12-27 | 2021-06-18 | ナミックス株式会社 | 樹脂組成物、硬化物、導電性膜、導電性パターン及び衣服 |
WO2018230445A1 (ja) * | 2017-06-16 | 2018-12-20 | Nok株式会社 | 生体電極 |
CN108736151B (zh) * | 2018-04-11 | 2020-10-02 | 安徽工程大学 | 一种柔性天线及其贴片制备方法 |
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