WO2022176939A1 - 耐熱性ミラブル型フロロシリコーンゴム組成物 - Google Patents
耐熱性ミラブル型フロロシリコーンゴム組成物 Download PDFInfo
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- WO2022176939A1 WO2022176939A1 PCT/JP2022/006337 JP2022006337W WO2022176939A1 WO 2022176939 A1 WO2022176939 A1 WO 2022176939A1 JP 2022006337 W JP2022006337 W JP 2022006337W WO 2022176939 A1 WO2022176939 A1 WO 2022176939A1
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- mass
- parts
- rubber composition
- fluorosilicone rubber
- component
- Prior art date
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- 239000000203 mixture Substances 0.000 title claims abstract description 81
- 229920005560 fluorosilicone rubber Polymers 0.000 title claims abstract description 44
- -1 siloxane units Chemical group 0.000 claims abstract description 52
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 44
- 229920001296 polysiloxane Polymers 0.000 claims abstract description 32
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 31
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 29
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910000314 transition metal oxide Inorganic materials 0.000 claims abstract description 23
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 19
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 19
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 18
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 14
- 125000003342 alkenyl group Chemical group 0.000 claims abstract description 13
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 13
- 125000003709 fluoroalkyl group Chemical group 0.000 claims abstract description 10
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical group [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 46
- 229920001971 elastomer Polymers 0.000 claims description 16
- 239000003054 catalyst Substances 0.000 claims description 14
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical group [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 13
- 229920006136 organohydrogenpolysiloxane Polymers 0.000 claims description 11
- 238000007259 addition reaction Methods 0.000 claims description 8
- 239000002270 dispersing agent Substances 0.000 claims description 8
- 150000001451 organic peroxides Chemical class 0.000 claims description 8
- 239000000945 filler Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 230000003197 catalytic effect Effects 0.000 claims 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052710 silicon Inorganic materials 0.000 abstract 1
- 239000010703 silicon Substances 0.000 abstract 1
- 229920002379 silicone rubber Polymers 0.000 description 59
- 239000004945 silicone rubber Substances 0.000 description 59
- 230000000052 comparative effect Effects 0.000 description 17
- 238000012360 testing method Methods 0.000 description 17
- 229920001577 copolymer Polymers 0.000 description 10
- 150000001875 compounds Chemical class 0.000 description 9
- 125000004432 carbon atom Chemical group C* 0.000 description 8
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 8
- 229920001843 polymethylhydrosiloxane Polymers 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 229910000420 cerium oxide Inorganic materials 0.000 description 6
- 239000003086 colorant Substances 0.000 description 6
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 5
- 239000000049 pigment Substances 0.000 description 5
- 125000005372 silanol group Chemical group 0.000 description 5
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 5
- 229910002012 Aerosil® Inorganic materials 0.000 description 4
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- OLLFKUHHDPMQFR-UHFFFAOYSA-N dihydroxy(diphenyl)silane Chemical compound C=1C=CC=CC=1[Si](O)(O)C1=CC=CC=C1 OLLFKUHHDPMQFR-UHFFFAOYSA-N 0.000 description 4
- 125000005388 dimethylhydrogensiloxy group Chemical group 0.000 description 4
- 238000005227 gel permeation chromatography Methods 0.000 description 4
- 125000001183 hydrocarbyl group Chemical group 0.000 description 4
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 4
- 238000006459 hydrosilylation reaction Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 229910052697 platinum Inorganic materials 0.000 description 4
- 229910052723 transition metal Inorganic materials 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 125000000217 alkyl group Chemical group 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- DMWVYCCGCQPJEA-UHFFFAOYSA-N 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane Chemical compound CC(C)(C)OOC(C)(C)CCC(C)(C)OOC(C)(C)C DMWVYCCGCQPJEA-UHFFFAOYSA-N 0.000 description 2
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 2
- 238000004438 BET method Methods 0.000 description 2
- 239000004342 Benzoyl peroxide Substances 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 239000007983 Tris buffer Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 229940045985 antineoplastic platinum compound Drugs 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
- 229920005601 base polymer Polymers 0.000 description 2
- 235000019400 benzoyl peroxide Nutrition 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- UNJPQTDTZAKTFK-UHFFFAOYSA-K cerium(iii) hydroxide Chemical compound [OH-].[OH-].[OH-].[Ce+3] UNJPQTDTZAKTFK-UHFFFAOYSA-K 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 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
- 238000000354 decomposition reaction Methods 0.000 description 2
- 239000004205 dimethyl polysiloxane Substances 0.000 description 2
- 235000013870 dimethyl polysiloxane Nutrition 0.000 description 2
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 2
- 229910021485 fumed silica Inorganic materials 0.000 description 2
- NYMPGSQKHIOWIO-UHFFFAOYSA-N hydroxy(diphenyl)silicon Chemical compound C=1C=CC=CC=1[Si](O)C1=CC=CC=C1 NYMPGSQKHIOWIO-UHFFFAOYSA-N 0.000 description 2
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 229910052909 inorganic silicate Inorganic materials 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 150000003961 organosilicon compounds Chemical class 0.000 description 2
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 150000003058 platinum compounds Chemical class 0.000 description 2
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 125000003944 tolyl group Chemical group 0.000 description 2
- 150000003624 transition metals Chemical class 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- 229910001928 zirconium oxide Inorganic materials 0.000 description 2
- WRXCBRHBHGNNQA-UHFFFAOYSA-N (2,4-dichlorobenzoyl) 2,4-dichlorobenzenecarboperoxoate Chemical compound ClC1=CC(Cl)=CC=C1C(=O)OOC(=O)C1=CC=C(Cl)C=C1Cl WRXCBRHBHGNNQA-UHFFFAOYSA-N 0.000 description 1
- AGKBXKFWMQLFGZ-UHFFFAOYSA-N (4-methylbenzoyl) 4-methylbenzenecarboperoxoate Chemical compound C1=CC(C)=CC=C1C(=O)OOC(=O)C1=CC=C(C)C=C1 AGKBXKFWMQLFGZ-UHFFFAOYSA-N 0.000 description 1
- KWEKXPWNFQBJAY-UHFFFAOYSA-N (dimethyl-$l^{3}-silanyl)oxy-dimethylsilicon Chemical compound C[Si](C)O[Si](C)C KWEKXPWNFQBJAY-UHFFFAOYSA-N 0.000 description 1
- QYLFHLNFIHBCPR-UHFFFAOYSA-N 1-ethynylcyclohexan-1-ol Chemical compound C#CC1(O)CCCCC1 QYLFHLNFIHBCPR-UHFFFAOYSA-N 0.000 description 1
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$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 1
- WZJUBBHODHNQPW-UHFFFAOYSA-N 2,4,6,8-tetramethyl-1,3,5,7,2$l^{3},4$l^{3},6$l^{3},8$l^{3}-tetraoxatetrasilocane Chemical compound C[Si]1O[Si](C)O[Si](C)O[Si](C)O1 WZJUBBHODHNQPW-UHFFFAOYSA-N 0.000 description 1
- 125000000094 2-phenylethyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])C([H])([H])* 0.000 description 1
- 229910002016 Aerosil® 200 Inorganic materials 0.000 description 1
- 229910052582 BN Inorganic materials 0.000 description 1
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 239000005046 Chlorosilane Substances 0.000 description 1
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 1
- 239000005751 Copper oxide Substances 0.000 description 1
- XMSXQFUHVRWGNA-UHFFFAOYSA-N Decamethylcyclopentasiloxane Chemical compound C[Si]1(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O1 XMSXQFUHVRWGNA-UHFFFAOYSA-N 0.000 description 1
- IUMSDRXLFWAGNT-UHFFFAOYSA-N Dodecamethylcyclohexasiloxane Chemical compound C[Si]1(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O1 IUMSDRXLFWAGNT-UHFFFAOYSA-N 0.000 description 1
- 239000005909 Kieselgur Substances 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910004283 SiO 4 Inorganic materials 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 239000000370 acceptor Substances 0.000 description 1
- 230000001476 alcoholic effect Effects 0.000 description 1
- 125000003545 alkoxy group Chemical group 0.000 description 1
- 125000003710 aryl alkyl group Chemical group 0.000 description 1
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 description 1
- 125000004369 butenyl group Chemical group C(=CCC)* 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- KOPOQZFJUQMUML-UHFFFAOYSA-N chlorosilane Chemical compound Cl[SiH3] KOPOQZFJUQMUML-UHFFFAOYSA-N 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 229910000428 cobalt oxide Inorganic materials 0.000 description 1
- IVMYJDGYRUAWML-UHFFFAOYSA-N cobalt(ii) oxide Chemical compound [Co]=O IVMYJDGYRUAWML-UHFFFAOYSA-N 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 229910000431 copper oxide Inorganic materials 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- LSXWFXONGKSEMY-UHFFFAOYSA-N di-tert-butyl peroxide Chemical compound CC(C)(C)OOC(C)(C)C LSXWFXONGKSEMY-UHFFFAOYSA-N 0.000 description 1
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 229920005645 diorganopolysiloxane polymer Polymers 0.000 description 1
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 125000005843 halogen group Chemical group 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000004687 hexahydrates Chemical class 0.000 description 1
- 125000006038 hexenyl group Chemical group 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 239000002075 main ingredient Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- UIUXUFNYAYAMOE-UHFFFAOYSA-N methylsilane Chemical compound [SiH3]C UIUXUFNYAYAMOE-UHFFFAOYSA-N 0.000 description 1
- 229910000480 nickel oxide Inorganic materials 0.000 description 1
- HMMGMWAXVFQUOA-UHFFFAOYSA-N octamethylcyclotetrasiloxane Chemical compound C[Si]1(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O1 HMMGMWAXVFQUOA-UHFFFAOYSA-N 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- PARWUHTVGZSQPD-UHFFFAOYSA-N phenylsilane Chemical compound [SiH3]C1=CC=CC=C1 PARWUHTVGZSQPD-UHFFFAOYSA-N 0.000 description 1
- 239000011941 photocatalyst Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 239000010948 rhodium Substances 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 150000004756 silanes Chemical class 0.000 description 1
- SCPYDCQAZCOKTP-UHFFFAOYSA-N silanol Chemical group [SiH3]O SCPYDCQAZCOKTP-UHFFFAOYSA-N 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- CXUYURWORTZPEG-UHFFFAOYSA-N tert-butyl (2-methylpropan-2-yl)oxy carbonate;hexane-1,6-diol Chemical compound OCCCCCCO.CC(C)(C)OOC(=O)OC(C)(C)C CXUYURWORTZPEG-UHFFFAOYSA-N 0.000 description 1
- GJBRNHKUVLOCEB-UHFFFAOYSA-N tert-butyl benzenecarboperoxoate Chemical compound CC(C)(C)OOC(=O)C1=CC=CC=C1 GJBRNHKUVLOCEB-UHFFFAOYSA-N 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 description 1
- 239000001052 yellow pigment Substances 0.000 description 1
Classifications
-
- 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
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
-
- 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
- C08L83/08—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/06—Preparatory processes
- C08G77/08—Preparatory processes characterised by the catalysts used
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/12—Polysiloxanes containing silicon bound to hydrogen
-
- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
-
- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
-
- 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
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/14—Peroxides
-
- 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
- C08K9/00—Use of pretreated ingredients
- C08K9/02—Ingredients treated with inorganic substances
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/20—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/22—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
- C08G77/24—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen halogen-containing groups
-
- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
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- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2265—Oxides; Hydroxides of metals of iron
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- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2265—Oxides; Hydroxides of metals of iron
- C08K2003/2272—Ferric oxide (Fe2O3)
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- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- 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
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/006—Additives being defined by their surface area
Definitions
- the present invention relates to a millable type fluorosilicone rubber composition that provides silicone rubber with good heat resistance.
- Silicone rubber has excellent weather resistance, electrical properties, low compression set, heat resistance, and cold resistance. Widely used.
- the main chain of the base polymer consists essentially of a repeating structure of (3,3,3-trifluoropropyl)methylsiloxane units having 3,3,3-trifluoropropyl groups as side chain substituents.
- Fluorosilicone rubber compositions based on fluorosilicone have excellent solvent resistance properties, and are widely used as diaphragms, O-rings, and oil seal materials for parts of transportation equipment and petroleum-related equipment.
- Patent Document 1 Japanese Patent Publication No. 2016-518461 describes that the heat resistance of silicone rubber is improved by adding 0.1% by mass or more of titanium oxide and iron oxide to silicone rubber. , the amounts of formaldehyde, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane generated when heated at 300° C. for 1 hour are measured, but there is no description of changes in physical properties.
- iron oxide is well known as a coloring agent for silicone rubber, and even a small amount of iron oxide colors silicone rubber red.
- Patent Document 2 Japanese Patent Application Laid-Open No. 2014-031408 describes that the heat resistance of silicone rubber is improved by adding hydrous cerium oxide and/or hydrous zirconium oxide to silicone rubber. The physical properties are measured after being placed in a dryer for 72 hours, but the physical properties deteriorate under higher temperature conditions.
- Patent Document 3 Japanese Patent Application Laid-Open No. 2006-021991
- Patent Document 4 Patent Document 4
- Patent Document 5 Japanese Patent Application Laid-Open No. 2006-021991
- Patent Document 5 disclose titanium oxide doped with metal ions (metal salts) such as transition metals. Only applications utilizing its optical properties, such as filters and photocatalysts, are disclosed.
- Patent Document 5 WO2018/079376
- heat resistance is improved by adding titanium oxide doped with 0.01 to 5% by mass of transition metal oxide and cerium oxide and/or cerium hydroxide to millable silicone rubber.
- Patent Document 6 (WO2008/154319) introduces a technique for improving heat resistance by adding carbon black, calcium carbonate, iron oxide, and optionally zinc oxide to fluorosilicone rubber. It is difficult to color to the desired appearance.
- an object of the present invention is to provide a millable type fluorosilicone rubber composition that gives a fluorosilicone rubber (cured product) with excellent heat resistance at 200°C or higher, particularly 250°C or higher.
- the present inventors have found that 0.01 to 5% by mass of transition metal oxide-modified titanium oxide and calcium carbonate are blended into a fluorosilicone rubber composition. By doing so, the inventors have found that the heat resistance of the fluorosilicone rubber obtained from the composition is remarkably improved, and have completed the present invention.
- the present invention (A) having at least two silicon-bonded alkenyl groups in one molecule and having siloxane units having at least one fluoroalkyl group in a number of 40% or more of the total number of siloxane units; And 100 parts by mass of organopolysiloxane having an average degree of polymerization of 100 or more, (B) 5 to 100 parts by mass of reinforcing silica having a specific surface area of 50 m 2 /g or more, (C) 0.01 to 10 parts by mass of titanium oxide modified with the transition metal oxide, containing 0.01 to 5% by mass of the transition metal oxide; Provided are a millable type fluorosilicone rubber composition containing (D) 0.01 to 10 parts by mass of calcium carbonate and (E) 0.1 to 50 parts by mass of a curing agent, and a cured product of the composition.
- the fluorosilicone rubber composition of the present invention can provide a fluorosilicone rubber (cured product) with excellent heat resistance. That is, the fluorosilicone rubber obtained by the present invention exhibits excellent heat resistance at 200°C or higher, particularly 250°C or higher. In addition, an increase in hardness of the fluorosilicone rubber can be suppressed. Furthermore, since the fluorosilicone rubber composition of the present invention is white, it can be easily colored in a desired color with a coloring agent such as a pigment.
- the composition of the present invention is described in detail below.
- the specific surface area is a value measured by the BET method.
- the millable composition is a highly viscous, non-liquid composition that does not self-flow at room temperature (25 ° C.), and is sheared by a kneader such as a roll mill (for example, two rolls or three rolls). It means a composition that can be uniformly kneaded under stress.
- Component (A) is an organopolysiloxane that is the main ingredient (base polymer) of the present composition, and has at least two silicon-bonded alkenyl groups per molecule and at least one fluoroalkyl group. It is an organopolysiloxane having 40% or more of siloxane units with respect to the total number of all siloxane units and having an average degree of polymerization of 100 or more. It contains 2 or more, preferably 2 to 10,000 alkenyl groups bonded to silicon atoms in one molecule.
- Organopolysiloxane has an average degree of polymerization of 100 or more (usually 100 to 100,000), preferably in the range of 1,000 to 100,000, preferably 2,000 to 100,000. A range of 50,000 is more preferred, and a range of 2,000 to 20,000 is particularly preferred. If the average degree of polymerization is less than the above lower limit, the silicone rubber composition of the present invention will not satisfy the properties as a millable rubber, and the roll kneadability and the like will be significantly deteriorated, which is not preferable. In the present invention, the average degree of polymerization is based on the polystyrene equivalent weight average molecular weight in GPC (gel permeation chromatography) analysis measured under the following conditions.
- GPC gel permeation chromatography
- the component (A) preferably has a high degree of polymerization (high viscosity) and is a non-liquid organopolysiloxane raw rubber having no self-fluidity at room temperature (25° C.).
- the component (A) has at least 40%, preferably at least 45%, of siloxane units having at least one fluoroalkyl group relative to the total number of siloxane units.
- the upper limit is not particularly limited as long as it is 100% or less, preferably less than 100%, more preferably 99.8% or less, and may be 98% or less.
- a copolymer containing a siloxane unit having a fluoroalkyl group and a siloxane unit having a dimethyl group can also be included by having the siloxane unit having a fluoroalkyl group within the above range.
- Component (A) is preferably represented by the following average compositional formula (1).
- R 1 n SiO (4 ⁇ n)/2 (1)
- R 1 is independently a monovalent hydrocarbon group having 1 to 20 carbon atoms or a fluoroalkyl group having 1 to 20 carbon atoms, and n is 1.95 to 2.04. is a positive number of
- each R 1 is independently a monovalent hydrocarbon group having 1 to 20 carbon atoms, preferably 1 to 12 carbon atoms, more preferably 1 to 8 carbon atoms, or 1 to 20 carbon atoms. , preferably 1 to 10, more preferably 1 to 6 fluoroalkyl groups.
- Examples of monovalent hydrocarbon groups include alkyl groups such as methyl group, ethyl group, propyl group and butyl group; cycloalkyl groups such as cyclohexyl group; alkenyl groups such as vinyl group, allyl group, butenyl group and hexenyl group; Aryl groups such as a phenyl group and a tolyl group, aralkyl groups such as a ⁇ -phenylpropyl group, and the like can be mentioned. Among these, a methyl group, a vinyl group and a phenyl group are preferred, and a methyl group and a vinyl group are more preferred.
- fluoroalkyl group examples include 3,3,3-trifluoropropyl group, 3,3,4,4,5,5,5-heptafluorobutyl group, and 3,3,4,4,5,5 , 6,6,6-nonafluorohexyl group and the like. Among them, a 3,3,3-trifluoropropyl group is preferred.
- n is a positive number of 1.95 to 2.04, preferably a positive number of 1.98 to 2.02. If n is out of the range of 1.95 to 2.04, the resulting cured product may not exhibit sufficient rubber elasticity.
- Organopolysiloxane must have two or more alkenyl groups in one molecule, and in the above formula (1), 0.001 to 10 mol% of the total moles of R 1 , especially 0 .01 to 5 mol % are preferably alkenyl groups.
- the alkenyl group is preferably a vinyl group or an allyl group, and particularly preferably a vinyl group.
- the structure of the organopolysiloxane of component (A) is not particularly limited, the main chain consists of repeating diorganosiloxane units (R 1 2 SiO 2/2 ), and both ends of the molecular chain are triorganosiloxy groups ( R 13 SiO 1/2 )-blocked linear diorganopolysiloxanes are preferred.
- R1 is as described above. Both ends of the molecular chain are preferably blocked with a trimethylsiloxy group, a dimethylvinylsiloxy group, a dimethylhydroxysiloxy group, a methyldivinylsiloxy group, a trivinylsiloxy group, or the like.
- These organopolysiloxanes may be used singly or in combination of two or more having different degrees of polymerization and molecular structures.
- the content of component (A) in the fluorosilicone rubber composition of the present invention is preferably 43 to 96% by mass, more preferably 50 to 90% by mass, and more preferably 60 to 80% by mass. More preferred.
- the reinforcing silica acts as a filler that imparts excellent mechanical properties to the resulting silicone rubber composition.
- the reinforcing silica may be either precipitated silica (wet silica) or fumed silica (dry silica) and has a large number of silanol groups on its surface.
- (B) the reinforcing silica must have a specific surface area of 50 m 2 /g or more according to the BET method. It is preferably 100 to 400 m 2 /g. If the specific surface area is less than 50 m 2 /g, the reinforcing effect of the silicone rubber imparted by the component (B) will be insufficient.
- Component (B), the reinforcing silica may be used in an untreated state, or may be surface-treated with an organosilicon compound such as organopolysiloxane, organopolysilazane, chlorosilane, or alkoxysilane, if necessary. good too. Reinforcing silica may be used singly or in combination of two or more.
- (B) Reinforcing silica is added in an amount of 5 to 100 parts by mass, preferably 10 to 80 parts by mass, and more preferably 20 to 70 parts by mass based on 100 parts by mass of the organopolysiloxane of component (A). be. If the amount of component (B) is more than the above upper limit or less than the above lower limit, not only is the processability of the resulting silicone rubber composition lowered, but also the cured silicone rubber obtained by curing the silicone rubber composition. mechanical properties such as tensile strength and tear strength are insufficient.
- Component (C) is a transition metal oxide-modified titanium oxide containing 0.01 to 5% by mass of a transition metal oxide, and is a component that remarkably improves the heat resistance of silicone rubber.
- titanium oxide modified with a transition metal oxide is more particularly titanium oxide doped with a transition metal oxide.
- doped refers to a form in which a transition metal oxide is present in the titanium oxide lattice. The amount of the transition metal oxide contained in the titanium oxide is 0.01 to 5% by mass, preferably 0.01% by mass, relative to the mass of the modified (especially doped) titanium oxide.
- the titanium oxide contains the transition metal oxide within the above range, the heat resistance of the resulting fluorosilicone rubber can be effectively improved.
- transition metal oxides refer to transition metal oxides other than titanium oxide which is modified.
- transition metal oxides include manganese oxide, iron oxide, cobalt oxide, nickel oxide, copper oxide, zinc oxide, and zirconium oxide, among which iron oxide (FeO, Fe 2 O 3 ) is preferred.
- iron oxide-modified titanium oxide particularly iron oxide-doped titanium oxide
- red coloration due to iron oxide can be suppressed and the heat resistance of the silicone rubber can be improved.
- Titanium oxide modified with a transition metal oxide, particularly titanium oxide doped with a transition metal oxide is produced by a known production method.
- Japanese Patent Application Laid-Open No. 2010-013484 describes a method of doping 80% anatase-type and 20% rutile-type crystalline titanium dioxide with iron oxide using titanium tetrachloride and iron trichloride.
- the amount of component (C) is 0.01 to 10 parts by weight, preferably 0.1 to 5 parts by weight, more preferably 0.5 to 3 parts by weight, per 100 parts by weight of organopolysiloxane (A). is. If the amount of component (C) is less than the above lower limit, the heat resistance of the silicone rubber will not be improved. If the above upper limit is exceeded, the mechanical properties of the silicone rubber may significantly deteriorate.
- the content of the transition metal oxide in the fluorosilicone rubber composition is preferably 0.005 to 1.0% by mass, more preferably 0.01 to 1.0% by mass, based on the total amount of the composition. It is 1.0% by mass, more preferably 0.01 to 0.5% by mass.
- the content is at least the above lower limit, the effect of the transition metal oxide contained in the titanium oxide can be sufficiently obtained, and when it is at most the above upper limit, there is little effect on coloration, which is preferable.
- Component (D) is calcium carbonate, which, together with component (C), significantly improves the heat resistance of the silicone rubber.
- Examples of commercially available calcium carbonate include Silver W, Hakuenka CCR (manufactured by Shiraishi Kogyo Co., Ltd.), Whiten SSB (manufactured by Bihoku Funka Kogyo Co., Ltd.), and the like.
- the amount of calcium carbonate in the fluorosilicone rubber composition is preferably 0.01 to 10 parts by mass, more preferably 0.1 to 5 parts by mass, more preferably 0.5 to 100 parts by mass per 100 parts by mass of component (A). 3 parts by mass. Below the above lower limit, the heat resistance of the silicone rubber is not improved. On the other hand, if the above upper limit is exceeded, the mechanical properties of the silicone rubber may significantly deteriorate.
- the particle size of calcium carbonate is not particularly limited, and may be, for example, an average particle size of 0.1 to 50 ⁇ m.
- a preferable compounding ratio of the component (C) and the component (D) is 1:100 to 100:1, more preferably 1:50 to 50:1 in mass ratio.
- the curing agent is not particularly limited as long as it can cure the silicone rubber composition used in the present invention.
- component may be used individually by 1 type, and may use 2 or more types together.
- Examples of the component (E) include (E-1) an organic peroxide curing agent, (E-2) an addition reaction type curing agent, and a combination of the (E-1) component and the (E-2) component. mentioned.
- the amount of component (E) is 0.1 to 50 parts by mass, preferably 0.1 to 40 parts by mass, more preferably 0.2 to 10 parts by mass, per 100 parts by mass of organopolysiloxane (A). Department.
- Organic peroxide curing agent (E-1)
- the organic peroxide curing agent include benzoyl peroxide, 2,4-dichlorobenzoyl peroxide, p-methylbenzoyl peroxide, o-methyl benzoyl peroxide, 2,4-dicumyl peroxide, 2,5-dimethyl-2,5-bis(t-butylperoxy)hexane, di-t-butyl peroxide, t-butyl perbenzoate, 1,6 -hexanediol-bis-t-butyl peroxycarbonate and the like.
- the amount of the organic peroxide curing agent is preferably 0.1 to 10 parts by mass, particularly preferably 0.2 to 5 parts by mass, per 100 parts by mass of component (A). If the amount is too small, curing may be insufficient, and if it is too large, the cured product of the silicone rubber may turn yellow due to decomposition residues of the organic peroxide.
- an organohydrogenpolysiloxane and a hydrosilylation catalyst are preferably used in combination.
- the organohydrogenpolysiloxane has 2 or more, preferably 3 or more, more preferably 3 to 200, and still more preferably about 4 to 100 silicon-bonded hydrogen atoms (i.e., hydrosilyl group), the structure may be linear, cyclic, branched or three-dimensional network structure, and the hydrosilyl group may be at the end of the molecular chain or in the middle of the molecular chain. or both.
- the organohydrogenpolysiloxane may be any organohydrogenpolysiloxane known as a cross-linking agent for addition reaction-curable silicone rubber compositions.
- an organohydrogenpolysiloxane represented by the following average compositional formula (2) can be used. R 2 p H q SiO (4-pq)/2 (2)
- R 2 is independently a substituted or unsubstituted monovalent hydrocarbon group having 1 to 12 carbon atoms, preferably 1 to 8 carbon atoms, and aliphatically unsaturated It is preferably one that does not have a bond.
- alkyl groups such as methyl group, ethyl group and propyl group, cycloalkyl groups such as cyclohexyl group, aryl groups such as phenyl group and tolyl group, benzyl group, 2-phenylethyl group, 2-phenylpropyl group and the like. and the like.
- Some or all of the hydrogen atoms in these groups may be substituted with halogen atoms, for example, a 3,3,3-trifluoropropyl group.
- p is 0 ⁇ p ⁇ 3, preferably 0.5 ⁇ p ⁇ 2.2, more preferably 1.0 ⁇ p ⁇ 2.0, and q is 0 ⁇ q ⁇ 3, preferably 0.002 ⁇ q ⁇ 1.1, more preferably 0.005 ⁇ q ⁇ 1, and p+q is 0 ⁇ p+q ⁇ 3, preferably 1 ⁇ p+q ⁇ 3, more preferably 1.002 ⁇ It is a positive number that satisfies p+q ⁇ 2.7.
- the organohydrogenpolysiloxane preferably has a viscosity at 25°C of 0.5 to 10,000 mPa ⁇ s, particularly 1 to 300 mPa ⁇ s. In the present invention, viscosity is measured at 25° C. using a rotational viscometer according to the method described in JIS K 7117-1:1999.
- the organohydrogenpolysiloxane preferably has an average degree of polymerization of 1 to 1,000, more preferably 3 to 150, particularly preferably 3 to 80. The average degree of polymerization is based on the polystyrene equivalent weight average molecular weight in GPC (gel permeation chromatography) analysis measured under the conditions described above.
- organohydrogenpolysiloxanes examples include 1,1,3,3-tetramethyldisiloxane, 1,3,5,7-tetramethylcyclotetrasiloxane, tris(hydrogendimethylsiloxy)methylsilane, tris(hydrogen dimethylsiloxy)phenylsilane, methylhydrogencyclopolysiloxane, methylhydrogensiloxane/dimethylsiloxane cyclic copolymer, both ends trimethylsiloxy group-blocked methylhydrogenpolysiloxane, both ends trimethylsiloxy group-blocked dimethylsiloxane/methylhydrogensiloxane Copolymer, dimethylpolysiloxane blocked at both ends by dimethylhydrogensiloxy groups, dimethylsiloxane/methylhydrogensiloxane copolymer blocked at both ends by dimethylhydrogensiloxy groups, copolymer of methylhydrogensiloxane/diphenyl
- the amount of the organohydrogenpolysiloxane compounded is preferably 0.1 to 40 parts by mass per 100 parts by mass of component (A).
- the number ratio of silicon-bonded hydrogen atoms (hydrosilyl groups) is suitably in the range of 0.5 to 10, preferably 0.7 to 1, per alkenyl group of component (A). A range of 5 is appropriate. If it is less than the above lower limit, cross-linking may be insufficient and sufficient mechanical strength may not be obtained. or the compression set may increase.
- the hydrosilylation catalyst is a catalyst for the hydrosilylation addition reaction between the alkenyl groups of the component (A) and the silicon-bonded hydrogen atoms (SiH groups) of the organohydrogenpolysiloxane.
- Hydrosilylation catalysts include platinum group metal-based catalysts. There are elemental platinum group metals and compounds thereof, and conventionally known catalysts for addition reaction-curable silicone rubber compositions may be used. For example, particulate platinum metal adsorbed on a carrier such as silica, alumina or silica gel, platinum catalyst such as platinic chloride, chloroplatinic acid, alcoholic solution of chloroplatinic acid hexahydrate, palladium catalyst, rhodium catalyst, etc. platinum or platinum compounds (platinum catalysts) are preferred.
- the amount of the catalyst to be added is sufficient as long as it can promote the above addition reaction. Generally, it is used in the range of 1 mass ppm to 1 mass %, preferably 10 to 500 mass ppm, based on the organopolysiloxane of the component (A) in terms of platinum group metal content. If the amount of the catalyst is less than the above lower limit, the addition reaction may not be sufficiently accelerated, resulting in insufficient curing. If it exceeds the above upper limit, there is little effect on reactivity, and it may be uneconomical.
- addition reaction curing and organic peroxide curing are combined by combining the above-mentioned (E-1) component and (E-2) component with the (A) component in the above-mentioned range of blending amounts.
- a co-vulcanized silicone rubber composition can also be used.
- the silicone rubber composition of the present invention may further contain a filler dispersant, particularly an inorganic filler or silica dispersant, in addition to the components (A) to (E). Dispersants for silica are preferred. By further containing the dispersant, the reinforcing silica described above can be well dispersed in the composition.
- the dispersant may be, for example, a low-molecular organosilicon compound having an alkoxy group or a silanol group, or a hydrolyzate thereof.
- alkoxysilanes particularly phenyl group-containing alkoxysilanes and hydrolysates thereof, diphenylsilanediol, carbon functional silanes, and silanol group-containing low-molecular-weight siloxanes may be used.
- diphenylsilanediol is preferable because it further improves the heat resistance of the silicone rubber. more preferred.
- the amount of component (F) is preferably 0.1 to 50 parts by mass, particularly preferably 1 to 20 parts by mass, per 100 parts by mass of component (A). If the amount of the silanol group-blocked organopolysiloxane at both ends is too small, the effect of the addition cannot be seen. Workability may deteriorate.
- the silicone rubber composition used in the present invention may optionally contain fillers other than component (B) (pulverized quartz, diatomaceous earth, etc.), colorants (pigments), tear strength improvers, flame retardant improvers (platinum compounds, etc.), acid acceptors, thermal conductivity improvers (alumina, boron nitride, etc.), release agents, reaction control agents, etc.
- fillers and additives for thermosetting silicone rubber compositions may be added.
- Other components may be used individually by 1 type, and may use 2 or more types together.
- the blending amount may be appropriately adjusted within a range that does not impair the effects of the present invention.
- the millable type silicone rubber composition of the present invention can be obtained by mixing the components constituting the composition with a known kneader such as a kneader, Banbury mixer, or two-roll mixer.
- a composition containing the above components (A) to (E) is used as the silicone rubber composition, (A) organopolysiloxane, (B) reinforcing silica, and (C) transition metal oxide-doped titanium oxide and (D) calcium carbonate, and then (E) a curing agent is preferably added to the resulting mixture.
- the composition containing the above components (A) to (E) further contains other components, components (A), (B), (C), (D) and other components After mixing to obtain a mixture, it is preferable to add component (E) to the mixture.
- a known molding method may be selected according to the desired shape and size of the molded product. For example, methods such as injection molding, compression molding, injection molding, calendar molding, and extrusion molding can be used.
- - Cured material - Curing conditions may be known conditions for the molding method used, and are generally from 60 to 450° C. for several seconds to one day.
- reducing the low-molecular-weight siloxane component remaining in the obtained silicone rubber, and removing organic peroxide decomposition products in the silicone rubber 200 C. or higher, preferably 200 to 250.degree.
- the (A) organopolysiloxanes used in Examples and Comparative Examples are as follows.
- the mol% of each siloxane unit in the following is the ratio of the number of each siloxane unit to the total number of siloxane units.
- Organopolysiloxane raw rubber with a molecular weight of 4,000 (alkenyl groups per molecule: 7, corresponding to n 2.0005 in the average compositional formula (1) above)
- Organopolysiloxane raw rubber having an average degree of polymerization of 4,000 (7 alkenyl groups per molecule, corresponding to n 2.0005 in
- Component (C) used in Examples and Comparative Examples is titanium oxide containing 3% by mass of iron oxide (Fe 2 O 3 ) and doped with the iron oxide (AEROXIDE TiO 2 PF2, manufactured by Nippon Aerosil Co., Ltd.). is. Further, in Comparative Example 3, titanium oxide (AEROXIDE TiO 2 P25, manufactured by Nippon Aerosil Co., Ltd.) not modified with iron oxide was used. Tables 1 and 2 show the iron oxide contents (% by mass) in the silicone rubber compositions in the following examples and comparative examples.
- Example 1 100 parts by mass of organopolysiloxane raw rubber (A1), 40 parts by mass of fumed silica having a BET specific surface area of 200 m 2 /g (Aerosil 200, manufactured by Nippon Aerosil Co., Ltd.), 5 parts by mass of diphenylsilanediol, and both terminal silanol groups.
- 1.0 parts by mass of 3,3,3-trifluoropropylmethylpolysiloxane having an average polymerization degree of 4 and a viscosity of 15 mPa s at 25 ° C. is added, and mixed with a kneader at 150 ° C. for 2 hours. After heating below, the base compound (1) was prepared.
- (C) 1.0 parts by mass of titanium oxide containing the above iron oxide is added to 100 parts by mass of organopolysiloxane raw rubber, and (D) calcium carbonate (Silver W, manufactured by Shiraishi Kogyo Co., Ltd.) ) was added by two rolls to prepare compound (A).
- compound (A) 0.6 parts by weight of 2,5-dimethyl-2,5-bis(t-butylperoxy)hexane as a curing agent (E) is added to 100 parts by weight of organopolysiloxane raw rubber. These were added using a main roll and uniformly mixed to obtain a crude rubber-like silicone rubber composition.
- the silicone rubber composition was press-cured at 165° C. and 70 kgf/cm 2 for 10 minutes to prepare a test sheet having a thickness of 2 mm.
- the test sheet was then post-cured in an oven at 200°C for 4 hours.
- the obtained cured product was subjected to the heat resistance test described above.
- Example 2 A silicone rubber composition was prepared by repeating Example 1 except that the amount of (C) titanium oxide containing iron oxide in Example 1 was changed to 2.0 parts by mass, and a cured product was obtained. The obtained cured product was subjected to the heat resistance test described above.
- Example 3 In Example 1, diphenylsilanediol was not added, dimethylpolysiloxane having both terminal silanol groups, an average degree of polymerization of 4, and a viscosity at 25 ° C. of 15 mPa s was added to 6.0 parts by mass.
- a silicone rubber composition was prepared by repeating Example 1 to obtain a cured product. The obtained cured product was subjected to the heat resistance test described above.
- Example 5 A silicone rubber composition was prepared by repeating Example 1 except that the organopolysiloxane raw rubber (A1) was changed to 100 parts by mass of the organopolysiloxane raw rubber (A2) to obtain a cured product. The obtained cured product was subjected to the heat resistance test described above.
- Example 1 A silicone rubber composition was prepared by repeating Example 1 except that (D) calcium carbonate was not added in Example 1, and a cured product was obtained. The obtained cured product was subjected to the heat resistance test described above.
- Example 2 A silicone rubber composition was prepared by repeating Example 1 except that component (C) was not added, and a cured product was obtained. The obtained cured product was subjected to the heat resistance test described above.
- Example 3 instead of the component (C) in Example 1, titanium oxide not modified with iron oxide (AEROXIDE TiO2 P25, manufactured by Nippon Aerosil Co., Ltd.) was added in an amount of 1.0 parts by mass per 100 parts by mass of organopolysiloxane raw rubber.
- a silicone rubber composition was prepared by repeating Example 1, except that 0.03 part by mass of iron oxide (Bengara SR-570, manufactured by Tone Sangyo Co., Ltd.) was added to obtain a cured product. The obtained cured product was subjected to the heat resistance test described above.
- Example 4 A silicone rubber composition was prepared by repeating Example 4 except that neither component (C) nor component (D) was added in Example 4, and a cured product was obtained. The obtained cured product was subjected to the heat resistance test described above.
- Example 5 A silicone rubber composition was prepared by repeating Example 1 except that neither component (C) nor component (D) was added, and a cured product was obtained. The obtained cured product was subjected to the heat resistance test described above.
- Example 1 was repeated except that component (D) was not added in Example 1, and instead 1 part by mass of cerium oxide (trade name cerium oxide SN-2 (manufactured by Nikki Co., Ltd.) was added. was prepared to obtain a cured product, which was subjected to the heat resistance test described above.
- cerium oxide trade name cerium oxide SN-2 (manufactured by Nikki Co., Ltd.) was added. was prepared to obtain a cured product, which was subjected to the heat resistance test described above.
- Example 1 except that the organopolysiloxane raw rubber (A1) in Example 1 was replaced with 3,3,3-trifluoropropylmethylpolysiloxane having an average degree of polymerization of 90 and having both ends blocked with dimethylvinylsiloxy groups. 1 was repeated to prepare base compound (2).
- the base compound (2) was liquid and could not be double roll kneaded (not shown in Table 1).
- the fluorosilicone rubber obtained from the composition containing only one of (C) titanium oxide containing iron oxide and (D) calcium carbonate was heated at 225°C and 260°C. Poor long-term heat resistance. Also, the fluorosilicone rubber obtained from the fluorosilicone rubber composition containing titanium oxide containing iron oxide and cerium oxide is also inferior in heat resistance at high temperatures for a long period of time (Comparative Example 6). Further, as shown in Comparative Example 3, the silicone rubber obtained from the composition to which titanium oxide and iron oxide were separately added has good long-term heat resistance, but despite the fact that only a small amount of iron oxide is blended, The silicone rubber was initially colored red, and coloring with a pigment was impossible.
- the silicone rubber (cured product) obtained from the fluorosilicone rubber composition of the present invention has excellent heat resistance and maintains good mechanical properties even under high-temperature long-term storage. It is possible to suppress an increase in the hardness of the silicone rubber. Furthermore, since the fluorosilicone rubber composition of the present invention is white, it can be easily colored in a desired color with a coloring agent.
- the fluorosilicone rubber composition of the present invention can provide a fluorosilicone rubber (cured product) with excellent heat resistance. That is, the fluorosilicone rubber obtained by the present invention exhibits excellent heat resistance at 200°C or higher, particularly 250°C or higher. In addition, an increase in hardness of the fluorosilicone rubber can be suppressed. Furthermore, since the fluorosilicone rubber composition of the present invention is white, it can be easily colored in a desired color with a coloring agent such as a pigment.
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Abstract
Description
特許文献5(WO2018/079376)ではミラブル型シリコーンゴムに0.01~5質量%の遷移金属酸化物をドープした酸化チタンと酸化セリウム及び/又は水酸化セリウムを併用添加することで耐熱性を改良するとしているがフロロシリコーンゴムの場合十分とは言えなかった。
特許文献6(WO2008/154319)ではフロロシリコーンゴムにカーボンブラック、炭酸カルシウム、酸化鉄、任意に酸化亜鉛を添加して耐熱性を向上させる技術が紹介されているが、カーボンや酸化鉄の添加により所望の外観に色付けすることが困難である。
(A)ケイ素原子に結合したアルケニル基を1分子中に少なくとも2個有し、及び、少なくとも1つのフルオロアルキル基を有するシロキサン単位をシロキサン単位の合計個数に対し40%以上の数で有し、且つ、平均重合度100以上を有するオルガノポリシロキサン 100質量部、
(B)比表面積50m2/g以上を有する補強性シリカ 5~100質量部、
(C)遷移金属酸化物を0.01~5質量%含む、前記遷移金属酸化物で変性された酸化チタン 0.01~10質量部、
(D)炭酸カルシウム 0.01~10質量部
及び
(E)硬化剤 0.1~50質量部
を含有するミラブル型フロロシリコーンゴム組成物、及び該組成物の硬化物を提供する。
本明細書中において、比表面積はBET法により測定された値である。なお、ミラブル型組成物とは、室温(25℃)において自己流動性のない高粘度で非液状の組成物であって、ロールミル(例えば、二本ロールや三本ロール)などの混練機で剪断応力下に均一に混練することが可能な組成物を意味する。
(A)成分は、本組成物の主剤(ベースポリマー)であるオルガノポリシロキサンであり、ケイ素原子に結合したアルケニル基を1分子中に少なくとも2個有し、及び、少なくとも1のフルオロアルキル基を有するシロキサン単位を全シロキサン単位の合計個数に対し40%以上で有し、且つ、平均重合度100以上を有するオルガノポリシロキサンである。ケイ素原子に結合したアルケニル基を1分子中に2個以上、好ましくは2~10,000個含有する。
・展開溶媒:THF
・流量:1mL/min
・検出器:示差屈折率検出器(RI)
・カラム:TSKGEL SUPERMULTIPORE HZ-H 4本((株)東ソー社製)
・カラム温度:25℃
・試料注入量:10μL(濃度0.1質量%のTHF溶液)
本発明において(A)成分は、高重合度(高粘度)であって、室温(25℃)において自己流動性のない非液状のオルガノポリシロキサン生ゴムであるのが好ましい。
R1 nSiO(4-n)/2 (1)
上記式(1)中、R1は、互いに独立に、炭素原子数1~20の1価炭化水素基又は炭素原子数1~20のフルオロアルキル基であり、nは1.95~2.04の正数である。
(B)成分の補強性シリカは、得られるシリコーンゴム組成物に対して優れた機械的特性を付与する充填材として作用する。該補強性シリカは、沈降シリカ(湿式シリカ)でもヒュームドシリカ(乾式シリカ)でもよく、表面に多数のシラノール基が存在しているものである。本発明において(B)補強性シリカは、BET法による比表面積50m2/g以上を有することが必要である。好ましくは100~400m2/gである。この比表面積が50m2/g未満であると、(B)成分により付与されるシリコーンゴムの補強効果が不十分となる。
(C)成分は、遷移金属酸化物を0.01~5質量%含有する、前記遷移金属酸化物で変性された酸化チタンであり、シリコーンゴムの耐熱性を著しく向上させる成分である。本発明において、遷移金属酸化物で変性された酸化チタンとは、より詳細には遷移金属酸化物でドープされた酸化チタンである。また「ドープされた」とは酸化チタンの格子中に遷移金属酸化物が存在する形のものを言う。酸化チタンに含まれる遷移金属酸化物の量は、変性された(特には、ドープされた)酸化チタンの質量に対して0.01~5質量%となる量であり、好ましくは0.01質量%超、好ましくは0.05質量%以上、より好ましくは0.1質量%以上、更に好ましくは1質量%以上であるのがよい。上限値は5質量%以下であり、好ましくは4.5質量%以下、より好ましくは4質量%以下であるのがよい。酸化チタンが当該範囲で遷移金属酸化物を含むことにより、得られるフロロシリコーンゴムの耐熱性を効果的に向上することができる。
(D)成分は炭酸カルシウムであり、前記(C)成分と相俟ってシリコーンゴムの耐熱性を著しく向上させる。市販の炭酸カルシウムとしては、シルバーW、ハクエンカCCR(白石工業株式会社製)、ホワイトンSSB(備北粉化工業株式会社製)等があげられる。フロロシリコーンゴム組成物中の炭酸カルシウムの量は(A)成分100質量部に対して0.01~10質量部が好ましく、より好ましくは0.1~5質量部、より好ましくは0.5~3質量部である。上記下限値未満では、シリコーンゴムの耐熱性が向上しない。また、上記上限値を超えると、シリコーンゴムの機械特性が著しく低下するおそれがある。炭酸カルシウムの粒径は特に制限されるものでなく、例えば平均粒径0.1~50μmであればよい。
(E)硬化剤は、本発明で用いるシリコーンゴム組成物を硬化させ得るものであれば特に限定されない。(E)成分は1種単独で使用してもよく、2種以上を併用してもよい。(E)成分としては、例えば、(E-1)有機過酸化物硬化剤、(E-2)付加反応型硬化剤、及び(E-1)成分と(E-2)成分との組み合わせが挙げられる。該(E)成分の量は、(A)オルガノポリシロキサン100質量部に対して0.1~50質量部であり、好ましくは0.1~40質量部、より好ましくは0.2~10質量部である。
(E-1)有機過酸化物硬化剤としては、例えば、ベンゾイルパーオキサイド、2,4-ジクロロベンゾイルパーオキサイド、p-メチルベンゾイルパーオキサイド、o-メチルベンゾイルパーオキサイド、2,4-ジクミルパーオキサイド、2,5-ジメチル-2,5-ビス(t-ブチルパーオキシ)ヘキサン、ジ-t-ブチルパーオキサイド、t-ブチルパーベンゾエート、1,6-ヘキサンジオール-ビス-t-ブチルパーオキシカーボネート等が挙げられる。
(E-2)付加反応硬化剤としては、オルガノハイドロジェンポリシロキサンとヒドロシリル化触媒とを組み合せて用いるのがよい。
オルガノハイドロジェンポリシロキサンとしては、1分子中に2個以上、好ましくは3個以上、より好ましくは3~200個、更に好ましくは4~100個程度のケイ素原子に結合した水素原子(即ち、ヒドロシリル基)を含有すれば、その構造は、直鎖状、環状、分枝状、三次元網状構造のいずれであってもよく、該ヒドロシリル基は、分子鎖末端にあっても、分子鎖の途中にあっても、その両方にあってもよい。
例えば、下記平均組成式(2)で表されるオルガノハイドロジェンポリシロキサンを用いることができる。
R2 pHqSiO(4-p-q)/2 (2)
なお、(A)成分に、上記(E-1)成分と(E-2)成分とを、それぞれ上記配合量の範囲内で組み合せて配合した、付加反応硬化と有機過酸化物硬化とを併用した共加硫型のシリコーンゴム組成物とすることもできる。
本発明のシリコーンゴム組成物は、前記(A)~(E)成分に加えて、充填材用分散剤、特には無機充填材又はシリカ用の分散剤を更に含んでもよい。好ましくはシリカ用分散剤である。当該分散剤を更に含むことで上述した補強性シリカを組成物中に良好に分散することができる。当該分散剤は、例えば、アルコキシ基又はシラノール基を有する低分子有機ケイ素化合物又はその加水分解物であればよい。より詳細には、各種アルコキシシラン、特にフェニル基含有アルコキシシラン及びその加水分解物、ジフェニルシランジオール、カーボンファンクショナルシラン、シラノール基含有低分子シロキサンを使用してもよい。中でも、ジフェニルシランジオールを用いると、シリコーンゴムの耐熱性がさらに向上するため好ましく、ジフェニルシランジオールをアルキルアルコキシシランまたはその加水分解物と併用することで、充填材の分散性がさらに向上するため、より好ましい。
本発明で用いるシリコーンゴム組成物には、本発明の効果を損なわない範囲において、上記成分に加え、必要に応じて、その他の成分として、(B)成分以外の充填材(粉砕石英、珪藻土、等)、着色剤(顔料)、引き裂き強度向上剤、難燃性向上剤(白金化合物等)、受酸剤、熱伝導率向上剤(アルミナ、窒化硼素等)、離型剤、反応制御剤等の、熱硬化型シリコーンゴム組成物における公知の充填材及び添加剤を添加してもよい。その他の成分は1種単独で用いてもよく、2種以上を併用してもよい。また、配合量は、本発明の効果を損ねない範囲において適宜調整されればよい。
本発明のミラブル型シリコーンゴム組成物は、該組成物を構成する成分をニーダー、バンバリーミキサー、二本ロール等の公知の混練機で混合することにより得ることができる。該シリコーンゴム組成物として上記(A)~(E)成分を含有する組成物を用いる場合、(A)オルガノポリシロキサンと(B)補強性シリカと(C)遷移金属酸化物をドープした酸化チタンと(D)炭酸カルシウムとを混合した後、得られた混合物に(E)硬化剤を添加することが好ましい。上記(A)~(E)成分を含有する組成物が更にその他の成分を含む場合には、(A)成分と(B)成分と(C)成分と(D)成分とその他の成分とを混合して混合物を得た後、該混合物に(E)成分を添加することが好ましい。
成形方法としては、目的とする成形品の形状及び大きさにあわせて公知の成形方法を選択すればよい。例えば、注入成形、圧縮成形、射出成形、カレンダー成形、押出成形などの方法が挙げられる。
硬化条件は、用いる成形方法における公知の条件でよく、一般的に60~450℃の温度で数秒~1日程度である。また、得られる硬化物の圧縮永久歪の低下、得られるシリコーンゴム中に残存している低分子シロキサン成分の低減、該シリコーンゴム中の有機過酸化物の分解物の除去等の目的で、200℃以上、好ましくは200~250℃のオーブン内等で1時間以上、好ましくは1~70時間程度、より好ましくは1~10時間のポストキュア(2次キュア)を行ってもよい。
シリコーンゴム組成物を硬化して作製した試験用シートを用い、JIS K 6249:2003に準拠して、硬さ(デュロメーターA)、引張強さ(MPa)、切断時伸び(%)の初期値を測定した。該試験用シートを225℃の乾燥機に7日間、または260℃の乾燥機に3日間入れた後に、硬さ、引張強さ、切断時伸びを測定した。結果を表1及び2に示す。
下記実施例及び比較例で調製したシリコーンゴム組成物100質量部に対して、黄色顔料(商品名:KE-COLOR-Y-064、信越化学工業株式会社製)0.5質量部を二本ロールによって添加し、配合前後の組成物の色調を目視にて確認した。その結果を表1及び2に示す。
オルガノポリシロキサン生ゴム(A1):3,3,3-トリフルオロプロピルメチルシロキサン単位99.825モル%、メチルビニルシロキサン単位0.125モル%、ジメチルビニルシロキシ単位0.05モル%からなり、平均重合度が4,000であるオルガノポリシロキサン生ゴム(1分子中のアルケニル基:7個、上記平均組成式(1)のn=2.0005に相当)
オルガノポリシロキサン生ゴム(A2):3,3,3-トリフルオロプロピルメチルシロキサン単位40モル%、ジメチルシロキサン単位59.825モル%、メチルビニルシロキサン単位0.125モル%、ジメチルビニルシロキシ単位0.05モル%からなり、平均重合度が4,000であるオルガノポリシロキサン生ゴム(1分子中のアルケニル基:7個、上記平均組成式(1)のn=2.0005に相当)
また、比較例3では、酸化鉄で変性していない酸化チタン(AEROXIDE TiO2 P25、日本アエロジル株式会社製)を用いた。
下記実施例及び比較例におけるシリコーンゴム組成物中の酸化鉄の含有率(質量%)を表1及び2に示す。
オルガノポリシロキサン生ゴム(A1)100質量部、BET法比表面積が200m2/gのヒュームドシリカ(アエロジル200、日本アエロジル株式会社製)40質量部、ジフェニルシランジオール5質量部、両末端シラノール基を有し、平均重合度4であり、25℃における粘度が15mPa・sである3,3,3-トリフルオロプロピルメチルポリシロキサン1.0質量部を添加し、150℃で2時間、ニーダーにより混合下で加熱した後、ベースコンパウンド(1)を調製した。
該ベースコンパウンド(1)に、オルガノポリシロキサン生ゴム100質量部に対して、(C)上記酸化鉄を含む酸化チタンを1.0質量部、(D)炭酸カルシウム(シルバーW、白石工業株式会社製)1.0質量部を、二本ロールで添加してコンパウンド(A)を調製した。
該コンパウンド(A)に、オルガノポリシロキサン生ゴム100質量部に対して、(E)硬化剤として2,5-ジメチル-2,5-ビス(t-ブチルパーオキシ)ヘキサン0.6質量部を二本ロールにて添加し、均一に混合して生ゴム状のシリコーンゴム組成物を得た。
実施例1において(C)上記酸化鉄を含む酸化チタンの添加量を2.0質量部とした以外は、実施例1を繰り返してシリコーンゴム組成物を調製し、硬化物を得た。得られた硬化物について、上述した耐熱性試験を行った。
実施例1において、ジフェニルシランジオールを添加せず、両末端シラノール基を有し、平均重合度4、25℃における粘度が15mPa・sであるジメチルポリシロキサンを6.0質量部にした以外は、実施例1を繰り返してシリコーンゴム組成物を調製し、硬化物を得た。得られた硬化物について、上述した耐熱性試験を行った。
上記コンパウンド(A)に、オルガノポリシロキサン生ゴム100質量部に対して、硬化剤として側鎖にヒドロシリル基を有する、両末端トリメチルシロキシ基封鎖メチルハイドロジェンポリシロキサン(重合度8、ヒドロシリル基が0.014モル/g(1分子中に8個)、上記平均組成式(2)のp=1.4、q=0.8に相当)0.5質量部、反応制御剤としてエチニルシクロヘキサノール0.07質量部、白金触媒(Pt濃度1質量%)0.15質量部を二本ロールにて添加し、均一に混合して生ゴム状のシリコーンゴム組成物を製造した後、該組成物を150℃、70kgf/cm2の条件で10分間プレスキュアし、2mm厚の試験用シートを作製した。次いで該試験用シートを200℃のオーブンで4時間ポストキュアした。得られた硬化物について、上述した耐熱性試験を行った。
実施例1においてオルガノポリシロキサン生ゴム(A1)をオルガノポリシロキサン生ゴム(A2)100質量部に変えた他は実施例1を繰り返してシリコーンゴム組成物を調製し、硬化物を得た。得られた硬化物について、上述した耐熱性試験を行った。
実施例1において(D)炭酸カルシウムを添加しない以外は、実施例1を繰り返してシリコーンゴム組成物を調製し、硬化物を得た。得られた硬化物について、上述した耐熱性試験を行った。
実施例1において(C)成分を添加しない以外は、実施例1を繰り返してシリコーンゴム組成物を調製し、硬化物を得た。得られた硬化物について、上述した耐熱性試験を行った。
実施例1において(C)成分に替えて、酸化鉄で変性していない酸化チタン(AEROXIDE TiO2 P25、日本アエロジル株式会社製)を、オルガノポリシロキサン生ゴム100質量部に対して1.0質量部、及び、酸化鉄(べんがら SR-570、利根産業株式会社製)0.03質量部を添加した以外は、実施例1を繰り返してシリコーンゴム組成物を調製し、硬化物を得た。得られた硬化物について、上述した耐熱性試験を行った。
実施例4において(C)成分及び(D)成分のいずれも添加しない以外は、実施例4を繰り返してシリコーンゴム組成物を調製し、硬化物を得た。得られた硬化物について、上述した耐熱性試験を行った。
実施例1において(C)成分及び(D)成分のいずれも添加しない以外は、実施例1を繰り返してシリコーンゴム組成物を調製し、硬化物を得た。得られた硬化物について、上述した耐熱性試験を行った。
実施例1において(D)成分を添加せず、代わりに酸化セリウム(商品名酸化セリウムSN-2(ニッキ株式会社製品)を1質量部添加した以外は、実施例1を繰り返してシリコーンゴム組成物を調製し、硬化物を得た。得られた硬化物について、上述した耐熱性試験を行った。
実施例1においてオルガノポリシロキサン生ゴム(A1)を、両末端がジメチルビニルシロキシ基で封鎖され、平均重合度90を有する3,3,3-トリフルオロプロピルメチルポリシロキサンに替えた以外は、実施例1を繰り返してベースコンパウンド(2)を調製した。当該ベースコンパウンド(2)は液状であり、二本ロールで練ることはできなかった(表1に示されていない)。
Claims (9)
- (A)ケイ素原子に結合したアルケニル基を1分子中に少なくとも2個有し、及び、少なくとも1つのフルオロアルキル基を有するシロキサン単位をシロキサン単位の合計個数に対し40%以上の数で有し、且つ、平均重合度100以上を有するオルガノポリシロキサン
100質量部、
(B)比表面積50m2/g以上を有する補強性シリカ
5~100質量部、
(C)遷移金属酸化物を0.01~5質量%含む、前記遷移金属酸化物で変性された酸化チタン 0.01~10質量部、
(D)炭酸カルシウム 0.01~10質量部
及び
(E)硬化剤 0.1~50質量部
を含有するミラブル型フロロシリコーンゴム組成物。 - 前記ミラブル型フロロシリコーンゴム組成物の総質量に対する前記遷移金属酸化物の量が、0.005~1.0質量%である、請求項1記載のミラブル型フロロシリコーンゴム組成物。
- 前記遷移金属酸化物が酸化鉄である、請求項1又は2記載のミラブル型フロロシリコーンゴム組成物。
- さらに(F)充填材用分散剤を0.1~50質量部含有する、請求項1~3のいずれか1項に記載のミラブル型フロロシリコーンゴム組成物。
- (A)成分が、平均重合度1,000~100,000を有する、直鎖状のオルガノポリシロキサンである、請求項1~4のいずれか1項記載のミラブル型フロロシリコーンゴム組成物。
- 前記(E)成分が有機過酸化物硬化剤であり、該(E)成分の量が0.1~10質量部である、請求項1~5のいずれか1項に記載のミラブル型フロロシリコーンゴム組成物。
- 前記(E)成分が付加反応型硬化剤であり、0.1~40質量部のオルガノハイドロジェンポリシロキサンと、触媒量の白金族金属触媒との組み合わせである、請求項1~5のいずれか1項に記載のミラブル型フロロシリコーンゴム組成物。
- 前記(F)成分がシリカ用分散剤である、請求項4記載のミラブル型フロロシリコーンゴム組成物。
- 請求項1~8のいずれか1項に記載のミラブル型フロロシリコーンゴム組成物の硬化物。
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EP22756257.6A EP4296304A1 (en) | 2021-02-18 | 2022-02-17 | Heat-resistant millable fluorosilicone rubber composition |
JP2023500916A JPWO2022176939A1 (ja) | 2021-02-18 | 2022-02-17 | |
US18/546,627 US20240132672A1 (en) | 2021-02-18 | 2022-02-17 | Millable fluorosilicone rubber composition having heat resistance |
KR1020237027159A KR20230146019A (ko) | 2021-02-18 | 2022-02-17 | 내열성 미러블형 플루오로실리콘 고무 조성물 |
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JPH03149259A (ja) * | 1989-11-06 | 1991-06-25 | Toshiba Silicone Co Ltd | 高強度室温硬化性ポリオルガノシロキサン組成物 |
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JP2010013484A (ja) | 2004-12-23 | 2010-01-21 | Evonik Degussa Gmbh | 構造的に変性された二酸化チタン |
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JP2014031408A (ja) | 2012-08-02 | 2014-02-20 | Momentive Performance Materials Inc | 熱硬化性シリコーンゴム組成物 |
JP2016518461A (ja) | 2013-05-23 | 2016-06-23 | 東レ・ダウコーニング株式会社 | 耐熱性シリコーンゴム組成物 |
CN105754353A (zh) * | 2016-03-28 | 2016-07-13 | 东莞市亚马电子有限公司 | 一种高导热硅胶皮及其制作工艺 |
WO2018079376A1 (ja) | 2016-10-28 | 2018-05-03 | 信越化学工業株式会社 | 耐熱性ミラブル型シリコーンゴム組成物 |
-
2022
- 2022-02-17 EP EP22756257.6A patent/EP4296304A1/en active Pending
- 2022-02-17 KR KR1020237027159A patent/KR20230146019A/ko unknown
- 2022-02-17 JP JP2023500916A patent/JPWO2022176939A1/ja active Pending
- 2022-02-17 US US18/546,627 patent/US20240132672A1/en active Pending
- 2022-02-17 WO PCT/JP2022/006337 patent/WO2022176939A1/ja active Application Filing
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Publication number | Priority date | Publication date | Assignee | Title |
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JPH03149259A (ja) * | 1989-11-06 | 1991-06-25 | Toshiba Silicone Co Ltd | 高強度室温硬化性ポリオルガノシロキサン組成物 |
JP2006021991A (ja) | 2004-06-09 | 2006-01-26 | Kansai Paint Co Ltd | 金属ドープ酸化チタン微粒子の製造方法 |
JP2010013484A (ja) | 2004-12-23 | 2010-01-21 | Evonik Degussa Gmbh | 構造的に変性された二酸化チタン |
WO2008154319A1 (en) | 2007-06-08 | 2008-12-18 | Dow Corning Corporation | Fluorosilicone elastomers for high temperature performance |
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JP2014031408A (ja) | 2012-08-02 | 2014-02-20 | Momentive Performance Materials Inc | 熱硬化性シリコーンゴム組成物 |
JP2016518461A (ja) | 2013-05-23 | 2016-06-23 | 東レ・ダウコーニング株式会社 | 耐熱性シリコーンゴム組成物 |
CN105754353A (zh) * | 2016-03-28 | 2016-07-13 | 东莞市亚马电子有限公司 | 一种高导热硅胶皮及其制作工艺 |
WO2018079376A1 (ja) | 2016-10-28 | 2018-05-03 | 信越化学工業株式会社 | 耐熱性ミラブル型シリコーンゴム組成物 |
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US20240132672A1 (en) | 2024-04-25 |
EP4296304A1 (en) | 2023-12-27 |
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