JP7409339B2 - Curable liquid silicone rubber foam composition for mechanical foaming and method for producing silicone rubber foam - Google Patents
Curable liquid silicone rubber foam composition for mechanical foaming and method for producing silicone rubber foam Download PDFInfo
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- JP7409339B2 JP7409339B2 JP2021030053A JP2021030053A JP7409339B2 JP 7409339 B2 JP7409339 B2 JP 7409339B2 JP 2021030053 A JP2021030053 A JP 2021030053A JP 2021030053 A JP2021030053 A JP 2021030053A JP 7409339 B2 JP7409339 B2 JP 7409339B2
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- silicone rubber
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- 239000000203 mixture Substances 0.000 title claims description 108
- 239000006260 foam Substances 0.000 title claims description 93
- 238000005187 foaming Methods 0.000 title claims description 73
- 229920002379 silicone rubber Polymers 0.000 title claims description 70
- 239000004944 Liquid Silicone Rubber Substances 0.000 title claims description 36
- 239000004945 silicone rubber Substances 0.000 title claims description 34
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- -1 organosilane compound Chemical class 0.000 claims description 41
- 239000011256 inorganic filler Substances 0.000 claims description 35
- 229910003475 inorganic filler Inorganic materials 0.000 claims description 35
- 125000003342 alkenyl group Chemical group 0.000 claims description 32
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 28
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical group [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 27
- 229920005645 diorganopolysiloxane polymer Polymers 0.000 claims description 25
- 239000003054 catalyst Substances 0.000 claims description 17
- 239000003795 chemical substances by application Substances 0.000 claims description 16
- 229910052751 metal Inorganic materials 0.000 claims description 15
- 239000002184 metal Substances 0.000 claims description 15
- 229920006136 organohydrogenpolysiloxane Polymers 0.000 claims description 14
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 13
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 8
- 125000000524 functional group Chemical group 0.000 claims description 4
- 125000005370 alkoxysilyl group Chemical group 0.000 claims description 3
- 125000003700 epoxy group Chemical group 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 125000001183 hydrocarbyl group Chemical group 0.000 claims 1
- 239000007788 liquid Substances 0.000 description 28
- 238000001723 curing Methods 0.000 description 24
- 238000002156 mixing Methods 0.000 description 24
- 239000007789 gas Substances 0.000 description 22
- 239000000463 material Substances 0.000 description 21
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 15
- 230000014759 maintenance of location Effects 0.000 description 14
- 238000000034 method Methods 0.000 description 13
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 13
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 10
- 229920001296 polysiloxane Polymers 0.000 description 10
- 239000004014 plasticizer Substances 0.000 description 9
- 229920001843 polymethylhydrosiloxane Polymers 0.000 description 9
- 239000002253 acid Substances 0.000 description 8
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 7
- 150000002430 hydrocarbons Chemical group 0.000 description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 125000004432 carbon atom Chemical group C* 0.000 description 6
- 125000005388 dimethylhydrogensiloxy group Chemical group 0.000 description 6
- 229910052710 silicon Inorganic materials 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 239000011344 liquid material Substances 0.000 description 5
- 239000000049 pigment Substances 0.000 description 5
- 229910052697 platinum Inorganic materials 0.000 description 5
- 239000004604 Blowing Agent Substances 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- 125000001931 aliphatic group Chemical group 0.000 description 4
- 238000006356 dehydrogenation reaction Methods 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- CLSUSRZJUQMOHH-UHFFFAOYSA-L platinum dichloride Chemical compound Cl[Pt]Cl CLSUSRZJUQMOHH-UHFFFAOYSA-L 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 229920002545 silicone oil Polymers 0.000 description 4
- 229920002050 silicone resin Polymers 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 238000007259 addition reaction Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 125000000217 alkyl group Chemical group 0.000 description 3
- 150000001721 carbon Chemical group 0.000 description 3
- 238000006482 condensation reaction Methods 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 239000004205 dimethyl polysiloxane Substances 0.000 description 3
- 235000013870 dimethyl polysiloxane Nutrition 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 238000006459 hydrosilylation reaction Methods 0.000 description 3
- NYMPGSQKHIOWIO-UHFFFAOYSA-N hydroxy(diphenyl)silicon Chemical class C=1C=CC=CC=1[Si](O)C1=CC=CC=C1 NYMPGSQKHIOWIO-UHFFFAOYSA-N 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- QBERHIJABFXGRZ-UHFFFAOYSA-M rhodium;triphenylphosphane;chloride Chemical compound [Cl-].[Rh].C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 QBERHIJABFXGRZ-UHFFFAOYSA-M 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 0.000 description 3
- 125000001731 2-cyanoethyl group Chemical group [H]C([H])(*)C([H])([H])C#N 0.000 description 2
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000005046 Chlorosilane Substances 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- 239000006087 Silane Coupling Agent Substances 0.000 description 2
- 239000007983 Tris buffer Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 150000001336 alkenes Chemical class 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 125000004218 chloromethyl group Chemical group [H]C([H])(Cl)* 0.000 description 2
- 125000000068 chlorophenyl group Chemical group 0.000 description 2
- KOPOQZFJUQMUML-UHFFFAOYSA-N chlorosilane Chemical compound Cl[SiH3] KOPOQZFJUQMUML-UHFFFAOYSA-N 0.000 description 2
- SLLGVCUQYRMELA-UHFFFAOYSA-N chlorosilicon Chemical compound Cl[Si] SLLGVCUQYRMELA-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 2
- 230000001747 exhibiting effect Effects 0.000 description 2
- 125000001207 fluorophenyl group Chemical group 0.000 description 2
- 229910021485 fumed silica Inorganic materials 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 239000001023 inorganic pigment Substances 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 229910052703 rhodium Inorganic materials 0.000 description 2
- 239000010948 rhodium Substances 0.000 description 2
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000004408 titanium dioxide Substances 0.000 description 2
- RIOQSEWOXXDEQQ-UHFFFAOYSA-N triphenylphosphine Chemical compound C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 RIOQSEWOXXDEQQ-UHFFFAOYSA-N 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- 239000011995 wilkinson's catalyst Substances 0.000 description 2
- KWEKXPWNFQBJAY-UHFFFAOYSA-N (dimethyl-$l^{3}-silanyl)oxy-dimethylsilicon Chemical compound C[Si](C)O[Si](C)C KWEKXPWNFQBJAY-UHFFFAOYSA-N 0.000 description 1
- QYLFHLNFIHBCPR-UHFFFAOYSA-N 1-ethynylcyclohexan-1-ol Chemical compound C#CC1(O)CCCCC1 QYLFHLNFIHBCPR-UHFFFAOYSA-N 0.000 description 1
- 125000005999 2-bromoethyl group Chemical group 0.000 description 1
- 229910002012 Aerosil® Inorganic materials 0.000 description 1
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- SNRUBQQJIBEYMU-UHFFFAOYSA-N Dodecane Natural products CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 229910004283 SiO 4 Inorganic materials 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- YTEISYFNYGDBRV-UHFFFAOYSA-N [(dimethyl-$l^{3}-silanyl)oxy-dimethylsilyl]oxy-dimethylsilicon Chemical compound C[Si](C)O[Si](C)(C)O[Si](C)C YTEISYFNYGDBRV-UHFFFAOYSA-N 0.000 description 1
- 239000011358 absorbing material Substances 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229920005601 base polymer Polymers 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- DSVRVHYFPPQFTI-UHFFFAOYSA-N bis(ethenyl)-methyl-trimethylsilyloxysilane;platinum Chemical compound [Pt].C[Si](C)(C)O[Si](C)(C=C)C=C DSVRVHYFPPQFTI-UHFFFAOYSA-N 0.000 description 1
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 1
- 229910052794 bromium Inorganic materials 0.000 description 1
- 125000005998 bromoethyl group Chemical group 0.000 description 1
- 230000009172 bursting Effects 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
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 125000004093 cyano group Chemical group *C#N 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 125000000753 cycloalkyl group Chemical group 0.000 description 1
- 125000000582 cycloheptyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 1
- 125000000596 cyclohexenyl group Chemical group C1(=CCCCC1)* 0.000 description 1
- 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 1
- 125000001511 cyclopentyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C1([H])[H] 0.000 description 1
- 125000002704 decyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 208000028659 discharge Diseases 0.000 description 1
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000005227 gel permeation chromatography Methods 0.000 description 1
- 125000005843 halogen group Chemical group 0.000 description 1
- 238000013007 heat curing Methods 0.000 description 1
- 125000003187 heptyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000006038 hexenyl group Chemical group 0.000 description 1
- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 1
- 125000000555 isopropenyl group Chemical group [H]\C([H])=C(\*)C([H])([H])[H] 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000002075 main ingredient Substances 0.000 description 1
- 125000006178 methyl benzyl group Chemical group 0.000 description 1
- UIUXUFNYAYAMOE-UHFFFAOYSA-N methylsilane Chemical compound [SiH3]C UIUXUFNYAYAMOE-UHFFFAOYSA-N 0.000 description 1
- 125000001624 naphthyl group Chemical group 0.000 description 1
- 125000001971 neopentyl group Chemical group [H]C([*])([H])C(C([H])([H])[H])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 125000001400 nonyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000002347 octyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 150000001451 organic peroxides Chemical class 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 125000001147 pentyl group Chemical group C(CCCC)* 0.000 description 1
- 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 1
- 125000004344 phenylpropyl group Chemical group 0.000 description 1
- PARWUHTVGZSQPD-UHFFFAOYSA-N phenylsilane Chemical compound [SiH3]C1=CC=CC=C1 PARWUHTVGZSQPD-UHFFFAOYSA-N 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920003209 poly(hydridosilsesquioxane) Polymers 0.000 description 1
- 229920003216 poly(methylphenylsiloxane) Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 125000004368 propenyl group Chemical group C(=CC)* 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- SCPYDCQAZCOKTP-UHFFFAOYSA-N silanol Chemical compound [SiH3]O SCPYDCQAZCOKTP-UHFFFAOYSA-N 0.000 description 1
- 150000004819 silanols Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000011949 solid catalyst Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 125000000547 substituted alkyl group Chemical group 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 125000003944 tolyl group Chemical group 0.000 description 1
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 125000005023 xylyl group Chemical group 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
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- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Description
本発明は、例えば機械発泡装置等でガスを機械的に(物理的に)加圧混入することによって機械的(物理的)に発泡すると同時に、加熱により硬化してシリコーンゴム発泡体(シリコーンゴムスポンジ)を与えることができる機械発泡用(或いは物理発泡用)硬化性液状シリコーンゴム発泡体組成物及びシリコーンゴム発泡体の製造方法に関する。 In the present invention, a silicone rubber foam (silicone rubber sponge) is produced by mechanically (physically) foaming by mechanically (physically) pressurizing and mixing gas with a mechanical foaming device, etc., and at the same time hardening by heating. ) A curable liquid silicone rubber foam composition for mechanical foaming (or physical foaming) and a method for producing the silicone rubber foam.
従来、振動吸収材、遮音材、断熱材、クッション材等に発泡体が使用されており、シリコーン(オルガノポリシロキサン)樹脂を母剤としたシリコーンゴム発泡体(シリコーンゴムスポンジ)も主に耐熱性を必要とする用途に使用されている。このシリコーンゴム発泡体には、硬化前の材料(シリコーンゴム発泡体組成物)がパテ状を呈するタイプと、液状を呈するタイプが存在する。その発泡機構は、(1)ニトリル化合物や、アゾ化合物の分解による窒素ガス発生を利用する方法、(2)シラノール含有シロキサンとハイドロジェンシロキサンの脱水素縮合反応による脱水素反応を利用する方法、(3)機械発泡装置により材料(シリコーンゴム発泡体組成物)に外部から物理的(機械的)にガス(気泡)を加圧混入する方法などが挙げられる。 Conventionally, foams have been used for vibration absorbing materials, sound insulation materials, heat insulation materials, cushioning materials, etc., and silicone rubber foams (silicone rubber sponges) using silicone (organopolysiloxane) resin as a base material are also mainly heat-resistant. It is used for applications that require. There are two types of silicone rubber foams: one in which the material (silicone rubber foam composition) is putty-like before curing, and the other in liquid form. The foaming mechanism is (1) a method that utilizes nitrogen gas generation by decomposition of a nitrile compound or an azo compound, (2) a method that utilizes a dehydrogenation reaction due to a dehydrogenation condensation reaction of a silanol-containing siloxane and a hydrogen siloxane, ( 3) A method of physically (mechanically) pressurizing and mixing gas (bubbles) into the material (silicone rubber foam composition) from the outside using a mechanical foaming device.
(1)の場合、特に発泡剤としてニトリル化合物を利用した方法は、発泡剤の分解温度が高いため、発泡体の硬化温度に高温(150℃以上)が必要となる。発泡剤としてアゾ化合物を利用した場合、白金触媒への硬化阻害性は低減されるが、発泡剤の分解温度が高いことから120℃以下での硬化発泡には不利である。 In the case of (1), particularly in the method using a nitrile compound as a blowing agent, the decomposition temperature of the blowing agent is high, so a high temperature (150° C. or higher) is required for the curing temperature of the foam. When an azo compound is used as a blowing agent, the curing inhibition of the platinum catalyst is reduced, but since the decomposition temperature of the blowing agent is high, it is disadvantageous for curing and foaming at temperatures below 120°C.
(2)の場合、硬化物の安定性(耐熱硬度変化・圧縮永久ひずみ等)が(1)に劣る。また脱水素縮合反応に必要となる、ハイドロジェンシロキサン、水又はアルコール又はシラノール化合物、触媒を使用した場合、反応が抑制できないため2液もしくは3液混合型での輸送が必要となる。また、使用時に混合機を使用しなければならないため、使用工程が多いなどの問題がある。例として具体的には、特開昭51-46352号公報、特開昭54-135865号公報、特開昭57-180641号公報、特開平7-196832号公報(特許文献1~4)などの改良が重ねられているが、前述の不満足な点は改良されていない。最近開発された技術として、簡単に混合吐出硬化できる特開2002-187969号公報(特許文献5)が考案されているが、脱水素縮合反応による発泡の機構を脱していないため、同じく前述の不満足な点は改善できていない。特に、使用直前に混合機で混合してから発泡硬化しなければならないことには変りなく、使用上の設備コスト負担の原因となっている。 In the case of (2), the stability of the cured product (heat-resistant hardness change, compression set, etc.) is inferior to (1). Furthermore, when hydrogen siloxane, water, alcohol, silanol compounds, and catalysts required for the dehydrogenation condensation reaction are used, the reaction cannot be suppressed, so transportation in a two-liquid or three-liquid mixed type is required. In addition, since a mixer must be used during use, there are problems such as a large number of steps. Specific examples include JP-A-51-46352, JP-A-54-135865, JP-A-57-180641, JP-A-7-196832 (Patent Documents 1 to 4), etc. Although improvements have been made, the aforementioned unsatisfactory points have not been resolved. As a recently developed technology, Japanese Patent Application Laid-Open No. 2002-187969 (Patent Document 5) has been devised, which allows easy mixing and discharge curing, but it does not overcome the foaming mechanism caused by dehydrogenation condensation reaction, so it also does not meet the above-mentioned disadvantages. Some points have not been improved. In particular, it is still necessary to mix in a mixer immediately before use and then foam and harden, which causes a burden on equipment costs.
(3)の場合、硬化発泡後の発泡倍率をガス封入量によって精度よくコントロールできる傾向があるとされている。また材料(シリコーンゴム発泡体組成物)そのものには自己発ガス機構が不要となるため、材料(組成)設計の自由度が高く、かつ発ガス反応による発泡体硬化物特性への悪影響が少ないなどの有利な点がある。
特に、硬化前の材料(シリコーンゴム発泡体組成物)が従来の液状を呈するタイプの中で、機械発泡装置により材料(シリコーンゴム発泡体組成物)にガスを加圧混入する方法の場合、機械発泡装置による封入ガスを効率よく発泡/維持しないと高発泡倍率の硬化物(シリコーンゴム発泡体)が得られないが、従来の材料では材料が封入ガスを包含しきれずに破泡し、高発泡倍率の発泡体を得ることが難しかった。このため、ガス量による高発泡倍率化、また発泡倍率コントロールが可能な機械発泡装置用の材料(シリコーンゴム発泡体組成物)が求められていた。
In the case of (3), it is said that there is a tendency for the expansion ratio after curing and foaming to be accurately controlled by the amount of gas enclosed. In addition, since the material (silicone rubber foam composition) itself does not require a self-gas generation mechanism, there is a high degree of freedom in designing the material (composition), and there is less negative impact on the properties of the cured foam due to gas generation reactions. There are some advantages.
In particular, among conventional types in which the material (silicone rubber foam composition) before curing is in a liquid state, in the case of a method in which gas is mixed under pressure into the material (silicone rubber foam composition) using a mechanical foaming device, A cured product (silicone rubber foam) with a high expansion ratio cannot be obtained unless the filled gas is efficiently foamed/maintained using a foaming device. However, with conventional materials, the material cannot fully contain the filled gas and breaks, resulting in high foaming. It was difficult to obtain a foam of high magnification. For this reason, there has been a demand for a material for mechanical foaming equipment (silicone rubber foam composition) that can increase the expansion ratio by changing the amount of gas and control the expansion ratio.
本発明は、上記事情に鑑みなされたもので、機械発泡装置により材料(シリコーンゴム発泡体組成物)に外部から物理的(機械的)にガス(気泡)を加圧混入した際に、発泡倍率のコントロールが可能で、高発泡倍率のシリコーンゴム発泡体を得ることができる機械発泡用硬化性液状シリコーンゴム発泡体組成物、及び該組成物を機械発泡装置により発泡硬化するシリコーンゴム発泡体の製造方法を提供することを目的とする。 The present invention was made in view of the above circumstances, and when gas (bubbles) is physically (mechanically) pressurized and mixed into the material (silicone rubber foam composition) from the outside using a mechanical foaming device, the foaming ratio increases. A curable liquid silicone rubber foam composition for mechanical foaming that can be controlled to obtain a silicone rubber foam with a high expansion ratio, and a silicone rubber foam produced by foaming and curing the composition using a mechanical foaming device. The purpose is to provide a method.
本発明者は、シリコーン樹脂(オルガノポリシロキサン)を母剤としたシリコーンゴム発泡体(シリコーンゴムスポンジ)に関する上記従来技術の課題を解決するために鋭意検討した結果、機械発泡装置によりシリコーンゴム発泡体組成物に外部から機械的(物理的)にガス(気泡)を加圧混入する方法によって発泡体を製造する方法において、(A)1分子中に少なくとも2個のアルケニル基を有し、かつ1個以上のフェニル基を有するジオルガノポリシロキサン、(B)1分子中に少なくとも3個のケイ素原子に結合した水素原子を有するオルガノハイドロジェンポリシロキサン、及び(C)白金族金属系触媒を特定割合で含有し、かつ無機質充填剤を除いた成分中の液状成分が相溶してこの無機質充填剤を除いた成分の混和物が40℃で透明である機械発泡用硬化性液状シリコーンゴム発泡体組成物を用いることにより、良好な発泡倍率、泡保持性を示すシリコーンゴム発泡体が得られることを見出し、本発明をなすに至った。 As a result of intensive studies to solve the above-mentioned problems of the prior art regarding silicone rubber foams (silicone rubber sponges) using silicone resin (organopolysiloxane) as a base agent, the present inventors have discovered that silicone rubber foams can be produced using a mechanical foaming device. A method for producing a foam by mechanically (physically) pressurizing and mixing gas (bubbles) into a composition from the outside, the method comprising: (A) having at least two alkenyl groups in one molecule; (B) an organohydrogenpolysiloxane having at least three hydrogen atoms bonded to silicon atoms in one molecule; and (C) a platinum group metal catalyst in specific proportions. A curable liquid silicone rubber foam composition for mechanical foaming, in which the liquid components in the components excluding the inorganic filler are compatible with each other and the mixture of the components excluding the inorganic filler is transparent at 40°C. The inventors have discovered that a silicone rubber foam exhibiting good expansion ratio and foam retention can be obtained by using a silicone rubber foam, and the present invention has been completed based on this finding.
従って、本発明は、下記の機械発泡用硬化性液状シリコーンゴム発泡体組成物及び該組成物を発泡硬化するシリコーンゴム発泡体の製造方法を提供するものである。
[1]
(A)1分子中に少なくとも2個のアルケニル基を有し、かつ1個以上のフェニル基を有するジオルガノポリシロキサン:100質量部、
(B)1分子中に少なくとも3個のケイ素原子に結合した水素原子を有するオルガノハイドロジェンポリシロキサン:0.1~20質量部、及び
(C)白金族金属系触媒:(A)、(B)成分の合計質量に対し、白金原子の質量換算で0.1~1,000ppm
を含有し、かつ無機質充填剤を除いた成分の混和物が40℃で透明である機械発泡用硬化性液状シリコーンゴム発泡体組成物。
[2]
更に、無機質充填剤を(A)成分100質量部に対して0.1~200質量部含有するものである[1]に記載の機械発泡用硬化性液状シリコーンゴム発泡体組成物。
[3]
更に、エポキシ基、(メタ)アクリルオキシ基及びアルコキシシリル基から選ばれる官能性基を含有する1価炭化水素基を有する加水分解性オルガノシラン化合物及び/又はその部分加水分解性縮合物を接着性付与剤として(A)成分100質量部に対して0.1~20質量部含有するものである[1]又は[2]に記載の機械発泡用硬化性液状シリコーンゴム発泡体組成物。
[4]
23℃における粘度が1~10,000Pa・sであり、1液型又は2液型である[1]~[3]のいずれかに記載の機械発泡用硬化性液状シリコーンゴム発泡体組成物。
[5]
[1]~[4]のいずれかに記載の機械発泡用硬化性液状シリコーンゴム発泡体組成物を機械発泡装置により発泡硬化する工程を含むシリコーンゴム発泡体の製造方法。
Accordingly, the present invention provides the following curable liquid silicone rubber foam composition for mechanical foaming and a method for producing a silicone rubber foam by foaming and curing the composition.
[1]
(A) Diorganopolysiloxane having at least two alkenyl groups and one or more phenyl groups in one molecule: 100 parts by mass,
(B) organohydrogenpolysiloxane having at least three hydrogen atoms bonded to silicon atoms in one molecule: 0.1 to 20 parts by mass, and (C) platinum group metal catalyst: (A), (B) ) 0.1 to 1,000 ppm in terms of mass of platinum atoms based on the total mass of components
A curable liquid silicone rubber foam composition for mechanical foaming, wherein the mixture of the components excluding the inorganic filler is transparent at 40°C.
[2]
The curable liquid silicone rubber foam composition for mechanical foaming according to item [1], further containing 0.1 to 200 parts by mass of an inorganic filler per 100 parts by mass of component (A).
[3]
Furthermore, a hydrolyzable organosilane compound and/or a partially hydrolyzable condensate thereof having a monovalent hydrocarbon group containing a functional group selected from an epoxy group, a (meth)acryloxy group, and an alkoxysilyl group is used for adhesive properties. The curable liquid silicone rubber foam composition for mechanical foaming according to [1] or [2], which contains 0.1 to 20 parts by mass of the imparting agent per 100 parts by mass of component (A).
[4]
The curable liquid silicone rubber foam composition for mechanical foaming according to any one of [1] to [3], which has a viscosity at 23° C. of 1 to 10,000 Pa·s and is a one-component type or a two-component type.
[5]
A method for producing a silicone rubber foam comprising the step of foaming and curing the curable liquid silicone rubber foam composition for mechanical foaming according to any one of [1] to [4] using a mechanical foaming device.
本発明によれば、機械発泡装置を用いた封入ガスによる発泡硬化において、良好な発泡倍率、泡保持性を示す機械発泡用硬化性液状シリコーンゴム発泡体組成物を提供することができる。
本発明の機械発泡用硬化性液状シリコーンゴム発泡体組成物により、ガス量による高発泡倍率化、また発泡倍率コントロールが可能な機械発泡装置用の材料の提供が可能となり、安定した目的の高発泡倍率の成型品、封入品が得られるようになり、使用者に利益をもたらすことができる。
According to the present invention, it is possible to provide a curable liquid silicone rubber foam composition for mechanical foaming that exhibits good expansion ratio and foam retention when foamed and cured using a sealed gas using a mechanical foaming device.
The curable liquid silicone rubber foam composition for mechanical foaming of the present invention makes it possible to provide a material for mechanical foaming equipment that can increase the foaming ratio depending on the amount of gas and control the foaming ratio, resulting in stable and high foaming. Molded products and encapsulated products with high magnification can now be obtained, which can bring benefits to users.
以下、本発明を詳細に説明する。
本発明の機械発泡用硬化性液状シリコーンゴム発泡体組成物は、後述する(A)~(C)成分、及び必要により無機質充填剤の特定量を含有し、かつ無機質充填剤を除いた成分中の液状成分が相溶してこの無機質充填剤を除いた成分の混和物が40℃で透明を呈するものである。ここで、「無機質充填剤を除いた成分」とは、後述する(A)~(C)成分、及び必要により添加される任意の液状成分添加物のことをいう。
The present invention will be explained in detail below.
The curable liquid silicone rubber foam composition for mechanical foaming of the present invention contains components (A) to (C) described below and, if necessary, a specific amount of an inorganic filler, and contains the components excluding the inorganic filler. The liquid components are mutually dissolved, and the mixture of the components excluding the inorganic filler becomes transparent at 40°C. Here, "components other than the inorganic filler" refer to components (A) to (C) described below and any liquid component additives added as necessary.
[(A)アルケニル基含有ジオルガノポリシロキサン]
(A)成分のアルケニル基含有ジオルガノポリシロキサンは、本発明の機械発泡用硬化性液状シリコーンゴム発泡体組成物(以下、本発明の組成物ともいう)の主剤(ベースポリマー)として作用するものであり、1分子中に少なくとも2個のアルケニル基を含有し、かつ1個以上のフェニル基を有するジオルガノポリシロキサンで、通常は主鎖部分が基本的にジオルガノシロキサン単位の繰り返しからなり、分子鎖両末端がトリオルガノシロキシ基で封鎖された直鎖状のジオルガノポリシロキサンであるのが一般的であり、これは分子構造の一部に分枝状の構造を含んだものであってもよいが、硬化物の機械的強度等の物性の点から直鎖状のジオルガノポリシロキサンであることが好ましい。
[(A) Alkenyl group-containing diorganopolysiloxane]
The alkenyl group-containing diorganopolysiloxane of component (A) is one that acts as the main ingredient (base polymer) of the curable liquid silicone rubber foam composition for mechanical foaming of the present invention (hereinafter also referred to as the composition of the present invention). is a diorganopolysiloxane containing at least two alkenyl groups and one or more phenyl groups in one molecule, and usually the main chain portion basically consists of repeating diorganosiloxane units, Generally, it is a linear diorganopolysiloxane with both ends of the molecular chain blocked by triorganosiloxy groups, and this contains a branched structure as part of its molecular structure. However, linear diorganopolysiloxane is preferred from the viewpoint of physical properties such as mechanical strength of the cured product.
(A)成分のアルケニル基含有ジオルガノポリシロキサンは、アルケニル基を1分子中に少なくとも2個(通常、2~50個)、好ましくは2~20個、より好ましくは2~10個含有するものであり、アルケニル基としては、例えば、ビニル基、アリル基、プロペニル基、イソプロペニル基、ブテニル基、ヘキセニル基、シクロヘキセニル基等の通常炭素原子数2~8程度のものが挙げられる。該アルケニル基は、分子鎖末端のケイ素原子に結合するものであっても、分子鎖非末端(分子鎖途中)のケイ素原子に結合するものであってもよく、少なくとも分子鎖(両)末端のケイ素原子に結合するアルケニル基を含有するものであることが好ましいが、この場合、該アルケニル基は分子鎖の両末端にのみ存在していても、或いは分子鎖の両末端及び分子鎖非末端(分子鎖途中)に存在していてもよい。 The alkenyl group-containing diorganopolysiloxane of component (A) contains at least 2 (usually 2 to 50), preferably 2 to 20, more preferably 2 to 10 alkenyl groups in one molecule. Examples of the alkenyl group include those usually having about 2 to 8 carbon atoms, such as vinyl group, allyl group, propenyl group, isopropenyl group, butenyl group, hexenyl group, and cyclohexenyl group. The alkenyl group may be bonded to the silicon atom at the end of the molecular chain, or may be bonded to the silicon atom at the non-terminus of the molecular chain (in the middle of the molecular chain), and at least at the ends of the molecular chain (both). It is preferable that the alkenyl group contains an alkenyl group bonded to a silicon atom, but in this case, the alkenyl group may exist only at both ends of the molecular chain, or at both ends of the molecular chain and at the non-terminal end of the molecular chain ( (in the middle of the molecular chain).
(A)成分のアルケニル基含有ジオルガノポリシロキサンは、フェニル基を1個以上含むものであり、フェニル基を有することにより、本発明の組成物の泡保持性を向上させることができる。
(A)成分のアルケニル基含有ジオルガノポリシロキサンの分子中に1個以上含有するフェニル基は、例えばジフェニルシロキサン単位やフェニル(メチル)シロキサン単位等として、好ましくは主鎖を構成するジオルガノシロキサン単位中のケイ素原子(即ち、分子鎖非末端のケイ素原子)に結合した置換基として分子中に存在することが好ましく、該フェニル基は、分子中に好ましくは1~100個、より好ましくは10~80個、更に好ましくは20~60個程度含有することが望ましく、また、(A)成分のアルケニル基含有ジオルガノポリシロキサン中のケイ素原子に結合した非置換又は置換の1価炭化水素基全体に対して好ましくは1~20モル%、より好ましくは2~10モル%、更に好ましくは2~8モル%程度の比率で含有するものであることが望ましい。フェニル基の含有量が上記範囲よりも少ないと、組成物を硬化・発泡させる際に泡の保持能力が不十分となる場合があり、多すぎると、(A)成分のアルケニル基含有ジオルガノポリシロキサンと(B)成分や可塑剤などの他のジメチルポリシロキサン系の液状成分とが十分に相溶し難くなる結果、液剤(無機質充填剤を除いた液状成分の混和物)が透明性を得られなくなり、泡保持能力が著しく低下する場合がある。
The alkenyl group-containing diorganopolysiloxane of component (A) contains one or more phenyl groups, and by having the phenyl group, the foam retention properties of the composition of the present invention can be improved.
The phenyl group contained one or more in the molecule of the alkenyl group-containing diorganopolysiloxane of component (A) is preferably a diorganosiloxane unit constituting the main chain, such as a diphenylsiloxane unit or a phenyl(methyl)siloxane unit. The number of phenyl groups is preferably 1 to 100, more preferably 10 to 100, and the number of phenyl groups is preferably 1 to 100, more preferably 10 to 100. It is desirable to contain about 80, more preferably about 20 to 60, and the total number of unsubstituted or substituted monovalent hydrocarbon groups bonded to silicon atoms in the alkenyl group-containing diorganopolysiloxane of component (A) is It is desirable that the content is preferably about 1 to 20 mol%, more preferably 2 to 10 mol%, and still more preferably about 2 to 8 mol%. If the content of phenyl groups is less than the above range, the foam retention ability may become insufficient when the composition is cured and foamed, and if it is too large, the alkenyl group-containing diorganopolymer of component (A) may become insufficient. As a result, the siloxane and other dimethylpolysiloxane-based liquid components such as component (B) and plasticizers become difficult to dissolve sufficiently, resulting in the liquid agent (mixture of liquid components excluding inorganic filler) becoming transparent. The foam retention capacity may be significantly reduced.
このようなアルケニル基含有ジオルガノポリシロキサンとしては、例えば、下記一般式(1)で表される直鎖状ジオルガノポリシロキサンが挙げられる。
式中、R1の脂肪族不飽和結合を含有しない非置換又は置換の1価炭化水素基としては、例えば炭素原子数1~12、好ましくは炭素原子数1~10、より好ましくは炭素原子数1~6のものが挙げられ、具体的には、メチル基、エチル基、プロピル基、イソプロピル基、ブチル基、イソブチル基、tert-ブチル基、ペンチル基、ネオペンチル基、ヘキシル基、ヘプチル基、オクチル基、ノニル基、デシル基、ドデシル基等のアルキル基;シクロペンチル基、シクロヘキシル基、シクロヘプチル基等のシクロアルキル基;フェニル基、トリル基、キシリル基、ナフチル基、ビフェニリル基等のアリール基;ベンジル基、フェニルエチル基、フェニルプロピル基、メチルベンジル基等のアラルキル基;並びにこれらの基の炭素原子に結合している水素原子の一部又は全部がフッ素、塩素、臭素等のハロゲン原子、シアノ基などで置換された基、例えば、クロロメチル基、2-ブロモエチル基、3-クロロプロピル基、3,3,3-トリフルオロプロピル基、クロロフェニル基、フルオロフェニル基、シアノエチル基、3,3,4,4,5,5,6,6,6-ノナフルオロヘキシル基などが挙げられ、好ましくは、メチル基、エチル基、プロピル基、クロロメチル基、ブロモエチル基、3,3,3-トリフルオロプロピル基、シアノエチル基等の炭素原子数1~3の非置換又は置換のアルキル基及びフェニル基、クロロフェニル基、フルオロフェニル基等の非置換又は置換のフェニル基である。R1としては、メチル基、フェニル基が好ましい。
また、R1の少なくとも1個、好ましくは1~100個、より好ましくは10~80個、更に好ましくは20~60個はフェニル基である。
In the formula, the unsubstituted or substituted monovalent hydrocarbon group containing no aliphatic unsaturated bond for R 1 has, for example, a carbon atom number of 1 to 12, preferably a carbon atom number of 1 to 10, and more preferably a carbon atom number of 1 to 6, specifically methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, tert-butyl group, pentyl group, neopentyl group, hexyl group, heptyl group, octyl group. Alkyl groups such as nonyl, decyl, and dodecyl; cycloalkyl groups such as cyclopentyl, cyclohexyl, and cycloheptyl; aryl groups such as phenyl, tolyl, xylyl, naphthyl, and biphenylyl; benzyl aralkyl groups such as phenylethyl, phenylpropyl, and methylbenzyl; and some or all of the hydrogen atoms bonded to the carbon atoms of these groups are halogen atoms such as fluorine, chlorine, and bromine, and cyano groups. Groups substituted with, for example, chloromethyl group, 2-bromoethyl group, 3-chloropropyl group, 3,3,3-trifluoropropyl group, chlorophenyl group, fluorophenyl group, cyanoethyl group, 3,3,4 , 4,5,5,6,6,6-nonafluorohexyl group, etc., preferably methyl group, ethyl group, propyl group, chloromethyl group, bromoethyl group, 3,3,3-trifluoropropyl group. and an unsubstituted or substituted alkyl group having 1 to 3 carbon atoms, such as a cyanoethyl group, and an unsubstituted or substituted phenyl group, such as a phenyl group, a chlorophenyl group, or a fluorophenyl group. R 1 is preferably a methyl group or a phenyl group.
Furthermore, at least one R 1 , preferably 1 to 100, more preferably 10 to 80, even more preferably 20 to 60, is a phenyl group.
式中、Xのアルケニル基としては、例えば、ビニル基、アリル基、プロペニル基、イソプロペニル基、ブテニル基、ヘキセニル基、シクロヘキセニル基等の通常炭素原子数2~8程度のものが挙げられ、中でもビニル基、アリル基等の低級アルケニル基が好ましい。
また、Xのアルケニル基は、1分子中に少なくとも2個(通常、2~50個)、好ましくは2~20個、より好ましくは2~10個含有するものである。
In the formula, the alkenyl group of Among them, lower alkenyl groups such as vinyl group and allyl group are preferred.
Furthermore, each molecule of X contains at least 2 alkenyl groups (usually 2 to 50), preferably 2 to 20, and more preferably 2 to 10.
式中、nは0以上の整数、好ましくは10~2,000の整数、より好ましくは50~1,200の整数であり、mは0以上の整数、好ましくは0~40の整数、より好ましくは0~20の整数である。また、n及びmは、10≦n+m≦2,000を満たす整数であるのが好ましく、より好ましくは50≦n+m≦1,200であり、かつ0≦m/(n+m)≦0.2を満足する整数である。 In the formula, n is an integer of 0 or more, preferably an integer of 10 to 2,000, more preferably 50 to 1,200, and m is an integer of 0 or more, preferably an integer of 0 to 40, more preferably is an integer from 0 to 20. Further, n and m are preferably integers satisfying 10≦n+m≦2,000, more preferably 50≦n+m≦1,200, and satisfying 0≦m/(n+m)≦0.2. is an integer.
式中、aはケイ素原子毎に独立に0~3の整数、好ましくは1~3の整数であり、組成物を硬化・発泡させる際の泡の保持能力を重視する場合には1である方がより好ましく、泡の保持能力よりも硬化速度を重視する場合には3である方がより目的に合致する。 In the formula, a is an integer of 0 to 3 independently for each silicon atom, preferably an integer of 1 to 3, and is 1 when emphasis is placed on the foam retention ability when curing and foaming the composition. is more preferable, and when the curing speed is more important than the foam retention ability, 3 is more suitable for the purpose.
また、このようなアルケニル基含有ジオルガノポリシロキサンは、23℃における粘度が10~1,000,000mPa・s、特に100~500,000mPa・s程度のものが好ましい。 Further, such an alkenyl group-containing diorganopolysiloxane preferably has a viscosity of about 10 to 1,000,000 mPa·s, particularly about 100 to 500,000 mPa·s at 23°C.
本発明において、分子中のジオルガノシロキサン単位の繰り返し数(又は重合度)は、通常、トルエン等を展開溶媒としてゲルパーミエーションクロマトグラフィ分析におけるポリスチレン換算の数平均分子量(又は数平均重合度)等として求めることができる。また、粘度は、通常、23℃における回転粘度計(例えば、BL型、BH型、BS型、コーンプレート型、レオメータ等)により測定することができる。 In the present invention, the repeating number (or degree of polymerization) of diorganosiloxane units in a molecule is usually expressed as the number average molecular weight (or number average degree of polymerization) in terms of polystyrene in gel permeation chromatography analysis using toluene or the like as a developing solvent. You can ask for it. Further, the viscosity can usually be measured using a rotational viscometer (eg, BL type, BH type, BS type, cone plate type, rheometer, etc.) at 23°C.
(A)成分のアルケニル基含有ジオルガノポリシロキサンは、1種単独でも2種以上を併用してもよい。 The alkenyl group-containing diorganopolysiloxane of component (A) may be used alone or in combination of two or more.
[(B)オルガノハイドロジェンポリシロキサン]
(B)成分のオルガノハイドロジェンポリシロキサンは、本発明組成物の架橋剤(硬化剤)として作用するものであり、1分子中に少なくとも3個(通常、3~200個)、好ましくは3~100個程度のケイ素原子に結合する水素原子(即ち、SiH基)を含有するものであり、直鎖状、分岐鎖状、環状、或いは三次元網状構造(レジン構造)のいずれでもよいが、上述した(A)成分のアルケニル基含有ジオルガノポリシロキサンに完全に相溶して40℃にて透明を呈する構造及び配合量である必要がある。
[(B) Organohydrogenpolysiloxane]
The organohydrogenpolysiloxane component (B) acts as a crosslinking agent (curing agent) for the composition of the present invention, and there are at least 3 (usually 3 to 200), preferably 3 to 200 in one molecule. It contains about 100 hydrogen atoms (i.e., SiH groups) bonded to silicon atoms, and may have a linear, branched, cyclic, or three-dimensional network structure (resin structure), but the above-mentioned The structure and blending amount must be such that it is completely compatible with the alkenyl group-containing diorganopolysiloxane of component (A) and exhibits transparency at 40°C.
このようなオルガノハイドロジェンポリシロキサンの代表例としては、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が挙げられる。
HbR2
cSiO(4-b-c)/2 (2)
(式中、R2は独立に脂肪族不飽和結合を含有しない非置換又は置換の1価炭化水素基であり、b及びcは、0.001≦b≦1.2、0.8≦c≦2かつ0.8<b+c≦3となる数であり、好ましくは0.05≦b≦1、1.5≦c≦2かつ1.8≦b+c≦2.7となる数である。)
A representative example of such an organohydrogenpolysiloxane includes, for example, an organohydrogenpolysiloxane represented by the following average composition formula (2).
H b R 2 c SiO (4-bc)/2 (2)
(In the formula, R 2 is independently an unsubstituted or substituted monovalent hydrocarbon group containing no aliphatic unsaturated bond, and b and c are 0.001≦b≦1.2, 0.8≦c ≦2 and 0.8<b+c≦3, preferably 0.05≦b≦1, 1.5≦c≦2 and 1.8≦b+c≦2.7.)
式中、R2の脂肪族不飽和結合を含有しない非置換又は置換の1価炭化水素基としては、前記一般式(1)のR1として例示したものと同様のものが挙げられ、例えば炭素原子数1~12、好ましくは炭素原子数1~10、より好ましくは炭素原子数1~7のものが挙げられ、好ましくはメチル基等の炭素原子数1~3の低級アルキル基、フェニル基、3,3,3-トリフルオロプロピル基である。 In the formula, the unsubstituted or substituted monovalent hydrocarbon group not containing an aliphatic unsaturated bond for R2 includes the same groups as those exemplified as R1 in the general formula (1), such as carbon Examples include those having 1 to 12 atoms, preferably 1 to 10 carbon atoms, more preferably 1 to 7 carbon atoms, preferably lower alkyl groups having 1 to 3 carbon atoms such as methyl group, phenyl group, It is a 3,3,3-trifluoropropyl group.
1分子中のケイ素原子の数は2~300個、特に3~150個、とりわけ4~100個程度の室温(23℃±15℃、以下同じ)で液状のものが好適に用いられる。なお、ケイ素原子に結合する水素原子は分子鎖末端、分子鎖の途中(非末端)のいずれに位置していてもよく、両方に位置するものであってもよい。 The number of silicon atoms in one molecule is 2 to 300, particularly 3 to 150, particularly 4 to 100, and a liquid at room temperature (23° C.±15° C., the same applies hereinafter) is preferably used. Note that the hydrogen atom bonded to the silicon atom may be located at either the end of the molecular chain, the middle (non-terminal) of the molecular chain, or both.
このようなオルガノハイドロジェンポリシロキサンの例としては、例えば、1,1,3,3-テトラメチルジシロキサン、1,1,3,3,5,5-ヘキサメチルトリシロキサン、1,3,5,7-テトラメチルテトラシクロシロキサン、1,3,5,7,9-ペンタメチルペンタシクロシロキサン等のメチルハイドロジェンシクロシロキサンオリゴマー、トリス(ジメチルハイドロジェンシロキシ)メチルシラン、トリス(ジメチルハイドロジェンシロキシ)フェニルシラン、分子鎖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、分子鎖両末端トリメチルシロキシ基封鎖ジメチルシロキサン・メチルハイドロジェンシロキサン共重合体、分子鎖両末端トリメチルシロキシ基封鎖ジフェニルシロキサン・メチルハイドロジェンシロキサン共重合体、分子鎖両末端トリメチルシロキシ基封鎖メチルフェニルシロキサン・メチルハイドロジェンシロキサン共重合体、分子鎖両末端トリメチルシロキシ基封鎖ジメチルシロキサン・ジフェニルシロキサン・メチルハイドロジェンシロキサン共重合体、分子鎖両末端ジメチルハイドロジェンシロキシ基封鎖ジメチルポリシロキサン、分子鎖両末端ジメチルハイドロジェンシロキシ基封鎖メチルハイドロジェンポリシロキサン、分子鎖両末端ジメチルハイドロジェンシロキシ基封鎖ジメチルシロキサン・メチルハイドロジェンシロキサン共重合体、分子鎖両末端ジメチルハイドロジェンシロキシ基封鎖ジフェニルシロキサン・メチルハイドロジェンシロキサン共重合体、分子鎖両末端ジメチルハイドロジェンシロキシ基封鎖メチルフェニルシロキサン・メチルハイドロジェンシロキサン共重合体、分子鎖両末端ジメチルハイドロジェンシロキシ基封鎖ジメチルシロキサン・ジフェニルシロキサン・メチルハイドロジェンシロキサン共重合体、ジメチルハイドロジェンシロキシ単位とSiO4/2単位からなり、任意にトリメチルシロキシ単位、ジメチルシロキサン単位、メチルハイドロジェンシロキサン単位、ハイドロジェンシルセスキオキサン単位及び/又はメチルシルセスキオキサン単位を含んでもよい三次元網状構造のシリコーンレジンや、上記した各例示化合物において、メチル基の一部又は全部を他のアルキル基又はフェニル基で置換した化合物などが挙げられる。 Examples of such organohydrogenpolysiloxanes include, for example, 1,1,3,3-tetramethyldisiloxane, 1,1,3,3,5,5-hexamethyltrisiloxane, 1,3,5 , 7-tetramethyltetracyclosiloxane, methylhydrogencyclosiloxane oligomers such as 1,3,5,7,9-pentamethylpentacyclosiloxane, tris(dimethylhydrogensiloxy)methylsilane, tris(dimethylhydrogensiloxy)phenyl Silane, Methylhydrogenpolysiloxane with trimethylsiloxy groups at both ends of the molecular chain, Dimethylsiloxane/Methylhydrogensiloxane copolymer with trimethylsiloxy groups at both ends of the molecular chain, Diphenylsiloxane/Methylhydrogensiloxane with trimethylsiloxy groups at both ends of the molecular chain Copolymer, methylphenylsiloxane/methylhydrogensiloxane copolymer with trimethylsiloxy groups blocked at both ends of the molecular chain, dimethylsiloxane/diphenylsiloxane/methylhydrogensiloxane copolymer with trimethylsiloxy groups blocked at both ends of the molecular chain, both ends of the molecular chain Dimethylpolysiloxane blocked with dimethylhydrogensiloxy groups, Methylhydrogenpolysiloxane blocked with dimethylhydrogensiloxy groups at both molecular chain ends, Dimethylsiloxane/methylhydrogensiloxane copolymer blocked with dimethylhydrogensiloxy groups at both molecular chain ends, Both molecular chain ends blocked with dimethylhydrogensiloxy groups Diphenylsiloxane/methylhydrogensiloxane copolymer with terminal dimethylhydrogensiloxy groups blocked, Methylphenylsiloxane/methylhydrogensiloxane copolymer with dimethylhydrogensiloxy groups blocked at both molecular chain ends, dimethylhydrogensiloxane group blocked at both molecular chain ends Dimethylsiloxane/diphenylsiloxane/methylhydrogensiloxane copolymer, consisting of dimethylhydrogensiloxy units and SiO 4/2 units, optionally containing trimethylsiloxy units, dimethylsiloxane units, methylhydrogensiloxane units, hydrogensilsesquioxane Silicone resins with a three-dimensional network structure that may contain units and/or methylsilsesquioxane units, compounds in which part or all of the methyl groups in each of the above-mentioned exemplary compounds are replaced with other alkyl groups or phenyl groups, etc. can be mentioned.
本発明の組成物に用いるオルガノハイドロジェンポリシロキサンは、公知の方法で得ることができ、例えば、下記一般式:R2SiHCl2及びR2 2SiHCl(式中、R2は前記と同じである。)から選ばれる少なくとも1種のクロロシランを共加水分解し、或いは該クロロシランと下記一般式:R2 3SiCl及びR2 2SiCl2(式中、R2は前記と同じである。)から選ばれる少なくとも1種のクロロシランを組み合わせて共加水分解して得ることができる。また、オルガノハイドロジェンポリシロキサンは、このように共加水分解して得られたポリシロキサンを平衡化したものでもよい。 The organohydrogenpolysiloxane used in the composition of the present invention can be obtained by a known method, and has, for example, the following general formulas: R 2 SiHCl 2 and R 2 2 SiHCl (wherein R 2 is the same as above). ), or co-hydrolyzing at least one chlorosilane selected from the following general formulas: R 2 3 SiCl and R 2 2 SiCl 2 (wherein R 2 is the same as above) It can be obtained by co-hydrolyzing a combination of at least one type of chlorosilane. Further, the organohydrogenpolysiloxane may be one obtained by equilibrating the polysiloxane obtained by cohydrolyzing in this manner.
(B)成分の配合量は、上述した(A)成分のアルケニル基含有ジオルガノポリシロキサンと完全に相溶して40℃にて透明性を与えるという観点から、(A)成分100質量部に対して0.1~20質量部、好ましくは0.5~10質量部、より好ましくは0.8~5質量部である。(B)成分の配合量が0.1質量部より少ないと混合時に成分を均一にすることが困難であり、20質量部より多いと混合物全体の粘度が低下してしまうため、材料粘度が安定しなくなることがある。また、硬化して良好なシリコーンゴム発泡体(シリコーンスポンジ)を与えるという観点から、(A)成分のアルケニル基含有ジオルガノポリシロキサン中のアルケニル基1モル当たり、(B)成分のオルガノハイドロジェンポリシロキサン中のケイ素原子に結合した水素原子(即ち、SiH基)が、好ましくは0.5~4モル、より好ましくは0.8~2.5モルとなるような量で配合することが望ましい。 The amount of component (B) to be blended is 100 parts by mass of component (A) from the viewpoint of being completely compatible with the alkenyl group-containing diorganopolysiloxane of component (A) and providing transparency at 40°C. The amount is 0.1 to 20 parts by weight, preferably 0.5 to 10 parts by weight, and more preferably 0.8 to 5 parts by weight. If the amount of component (B) is less than 0.1 part by mass, it is difficult to make the ingredients uniform during mixing, and if it is more than 20 parts by mass, the viscosity of the entire mixture will decrease, resulting in a stable material viscosity. Sometimes it stops happening. In addition, from the viewpoint of curing to give a good silicone rubber foam (silicone sponge), the organohydrogen polysiloxane of the component (B) is It is desirable that the amount of hydrogen atoms bonded to silicon atoms (ie, SiH groups) in the siloxane is preferably 0.5 to 4 moles, more preferably 0.8 to 2.5 moles.
(B)成分のオルガノハイドロジェンポリシロキサンは、1種単独でも2種以上を併用してもよい。 The organohydrogenpolysiloxane (B) component may be used alone or in combination of two or more.
[(C)白金族金属系触媒]
本発明に用いる白金族金属系触媒は、(A)成分中のアルケニル基と(B)成分中のケイ素原子に結合する水素原子(SiH基)とのヒドロシリル化付加反応を促進するための触媒であり、ヒドロシリル化付加反応に用いられる触媒として周知の触媒が挙げられる。
[(C) Platinum group metal catalyst]
The platinum group metal catalyst used in the present invention is a catalyst for promoting the hydrosilylation addition reaction between the alkenyl group in component (A) and the silicon-bonded hydrogen atom (SiH group) in component (B). Well-known catalysts can be mentioned as catalysts used in the hydrosilylation addition reaction.
(C)成分の白金族金属系触媒は、前述した(A)成分及び(B)成分と完全に相溶して40℃にて透明を呈する構造及び配合量である必要がある。その具体例としては、例えば、白金(白金黒を含む)、ロジウム、パラジウム等の白金族金属単体;H2PtCl4・xH2O、H2PtCl6・xH2O、NaHPtCl6・xH2O、KHPtCl6・xH2O、Na2PtCl6・xH2O、K2PtCl4・xH2O、PtCl4・xH2O、PtCl2、Na2HPtCl4・xH2O(但し、式中、xは0~6の整数であり、好ましくは0又は6である。)等の塩化白金、塩化白金酸及び塩化白金酸塩;アルコール変性塩化白金酸(米国特許第3,220,972号明細書参照);塩化白金酸とオレフィンとのコンプレックス(錯体)(米国特許第3,159,601号明細書、同第3,159,662号明細書、同第3,775,452号明細書参照);ロジウム-オレフィンコンプレックス;クロロトリス(トリフェニルフォスフィン)ロジウム(ウィルキンソン触媒);塩化白金、塩化白金酸又は塩化白金酸塩とビニル基含有シロキサン、特にビニル基含有環状シロキサンとのコンプレックス;白金とアルコール又はビニル基含有シロキサンとのコンプレックスなどが挙げられるが、(C)成分としては、上記の白金族金属の単体等をはじめとする固体状の触媒を、アルミナ、シリカ、カーボン等の担体の表面に担持した形態としての固体状白金族金属系触媒は除く。即ち、上記の白金族金属単体、塩化白金、塩化白金酸、塩化白金酸塩、アルコール変性塩化白金酸、塩化白金酸とオレフィンとのコンプレックス(錯体)、ロジウム-オレフィンコンプレックス、クロロトリス(トリフェニルフォスフィン)ロジウム(ウィルキンソン触媒)、ビニル基含有シロキサンと塩化白金、塩化白金酸又は塩化白金酸塩とのコンプレックス(錯体)、白金とアルコール又はビニル基含有シロキサンとのコンプレックスなどは、全て透明液体状の白金族金属系触媒の形態、又は溶媒に溶解した透明溶液状の白金族金属系触媒の形態で使用する。なお、この白金族金属系触媒は、トルエン、低級アルコール、高級アルコール、シリコーン(ジオルガノポリシロキサン)等の有機溶剤に溶解して使用することが好ましい。 The platinum group metal catalyst as component (C) needs to have a structure and a blending amount such that it is completely compatible with the components (A) and (B) described above and exhibits transparency at 40°C. Specific examples include simple platinum group metals such as platinum (including platinum black), rhodium, and palladium; H 2 PtCl 4 .xH 2 O, H 2 PtCl 6 .xH 2 O, NaHPtCl 6 .xH 2 O , KHPtCl 6 .xH 2 O, Na 2 PtCl 6 .xH 2 O, K 2 PtCl 4 .xH 2 O, PtCl 4 .xH 2 O, PtCl 2 , Na 2 HPtCl 4 .xH 2 O (wherein, x is an integer from 0 to 6, preferably 0 or 6); platinum chloride, chloroplatinic acid and chloroplatinate salts; Complex of chloroplatinic acid and olefin (see U.S. Pat. No. 3,159,601, U.S. Pat. No. 3,159,662, U.S. Pat. No. 3,775,452) ; rhodium-olefin complex; chlorotris(triphenylphosphine) rhodium (Wilkinson catalyst); complex of platinum chloride, chloroplatinic acid or chloroplatinate with vinyl group-containing siloxane, especially vinyl group-containing cyclic siloxane; platinum and alcohol or Examples include complexes with vinyl group-containing siloxanes, etc. Component (C) includes a solid catalyst such as the above-mentioned single platinum group metal supported on the surface of a support such as alumina, silica, or carbon. Excludes solid platinum group metal catalysts in the form of Namely, the above platinum group metals, platinum chloride, chloroplatinic acid, chloroplatinic acid salts, alcohol-modified chloroplatinic acid, complexes of chloroplatinic acid and olefins, rhodium-olefin complexes, chlorotris (triphenylphosphine), etc. )Rhodium (Wilkinson catalyst), complexes of vinyl group-containing siloxane and platinum chloride, chloroplatinic acid or chloroplatinate, complexes of platinum and alcohol or vinyl group-containing siloxane, etc. are all transparent liquid platinum. It is used in the form of a group metal based catalyst or in the form of a platinum group metal based catalyst in the form of a transparent solution dissolved in a solvent. Note that this platinum group metal catalyst is preferably used after being dissolved in an organic solvent such as toluene, lower alcohol, higher alcohol, silicone (diorganopolysiloxane), or the like.
(C)成分の配合量は、所謂触媒量でよいが、前述した(A)成分及び(B)成分と完全に相溶して40℃にて透明を呈するという観点から、(A)、(B)成分の合計質量に対し、白金原子の質量換算で0.1~1,000ppm、好ましくは0.5~200ppmである。(C)成分の配合量が上記範囲より少ないと、組成物の硬化が不十分となる場合があり、上記範囲より多いと硬化反応が速過ぎて材料を使用する際の可使時間が不十分となる場合がある。 The blending amount of component (C) may be a so-called catalytic amount, but from the viewpoint that it is completely compatible with components (A) and (B) and exhibits transparency at 40°C, (A), ( The amount is 0.1 to 1,000 ppm, preferably 0.5 to 200 ppm, based on the mass of platinum atoms, based on the total mass of components B). If the amount of component (C) is less than the above range, the curing of the composition may be insufficient, and if it is more than the above range, the curing reaction will be too fast and the pot life of the material will be insufficient. In some cases,
[その他の成分]
本発明の組成物には、前記(A)成分、(B)成分及び(C)成分以外に、必要に応じて、各種の任意成分を添加することが可能であるが、下記に例示する任意成分は、後述する無機質充填剤を除いて、いずれも液状成分であり、上記した(A)~(C)成分と完全に相溶して40℃にて透明を呈する構造及び配合量である必要がある。
[Other ingredients]
In addition to the above-mentioned components (A), (B) and (C), various optional components can be added to the composition of the present invention as needed. All of the components, except for the inorganic filler described below, are liquid components, and must have a structure and blending amount that are completely compatible with the above-mentioned components (A) to (C) and exhibit transparency at 40°C. There is.
〔接着性付与剤〕
本発明の組成物には、例えば、高い自己接着性を必要とする用途の場合には、エポキシ基、(メタ)アクリルオキシ基及びアルコキシシリル基から選ばれる官能性基を含有する1価炭化水素基を有する加水分解性オルガノシラン化合物(いわゆるカーボンファンクショナルシラン或いはシランカップリング剤)及び/又はその部分加水分解性縮合物を接着性付与剤として配合することができる。
この接着性付与剤を配合する場合には、その配合量は、(A)成分100質量部に対して0.1~20質量部が好ましく、より好ましくは0.1~10質量部程度である。接着性付与剤の配合量が0.1質量部より少ないと目的である接着性の発現が不十分となり、20質量部より多いと組成物粘度の極端な低下や、(A)成分の溶解性の限度を超えて液状成分中の溶解状態が不十分となり、泡の安定性が低下する場合がある。
[Adhesive agent]
For example, in the case of applications requiring high self-adhesive properties, the composition of the present invention may contain a monovalent hydrocarbon containing a functional group selected from epoxy groups, (meth)acryloxy groups, and alkoxysilyl groups. A hydrolyzable organosilane compound having a group (so-called carbon functional silane or silane coupling agent) and/or a partially hydrolyzable condensate thereof can be blended as an adhesion imparting agent.
When blending this adhesion imparting agent, the blending amount is preferably about 0.1 to 20 parts by mass, more preferably about 0.1 to 10 parts by mass, per 100 parts by mass of component (A). . If the amount of the adhesion imparting agent is less than 0.1 part by mass, the desired adhesiveness will not be sufficiently developed, and if it is more than 20 parts by mass, the viscosity of the composition will be extremely reduced and the solubility of component (A) will be reduced. If the limit is exceeded, the state of dissolution in the liquid component may become insufficient and the stability of the foam may decrease.
〔反応制御剤〕
本発明の組成物には、白金族金属触媒による反応をコントロールするために、アセチレンアルコール類に代表される反応制御剤を添加してもよい。
この反応制御剤を配合する場合には、その配合量は、(A)成分100質量部に対して0.01~5質量部が好ましく、より好ましくは0.05~2質量部程度である。
なお、この反応制御剤は、(A)成分への溶解性が不十分な場合にはトルエン、アルコール、シリコーン(ジオルガノポリシロキサン)等の有機溶剤に溶解して使用することが好ましい。
[Reaction control agent]
A reaction control agent typified by acetylene alcohols may be added to the composition of the present invention in order to control the reaction caused by the platinum group metal catalyst.
When blending this reaction control agent, the blending amount is preferably about 0.01 to 5 parts by weight, more preferably about 0.05 to 2 parts by weight, per 100 parts by weight of component (A).
In addition, when this reaction control agent has insufficient solubility in component (A), it is preferable to use it by dissolving it in an organic solvent such as toluene, alcohol, or silicone (diorganopolysiloxane).
〔可塑剤〕
本発明の組成物には、組成物の粘度や硬化物(シリコーンゴム発泡体)の硬度を調整するための可塑剤として、分子中にアルケニル基やヒドロシリル基(SiH基)等のヒドロシリル化付加反応に関与する官能性基を含有しない、分子鎖両末端トリメチルシリル基封鎖ジメチルポリシロキサン(ジメチルシリコーンオイル)、分子鎖両末端トリメチルシリル基封鎖ジメチルシロキサン・ジフェニルシロキサン共重合体や分子鎖両末端トリメチルシリル基封鎖ジメチルシロキサン・メチルフェニルシロキサン共重合体(メチルフェニルシリコーンオイル)等の、いわゆる無官能シリコーンオイルなどを配合することができる。これらの中でも、本発明においては、上記した(A)~(C)成分と完全に相溶して40℃にて透明を呈するという観点から、フェニル基を含有するものがより好ましい。
この無官能シリコーンオイル(可塑剤)を配合する場合には、その配合量は、(A)成分100質量部に対して0.1~20質量部が好ましく、より好ましくは0.5~10質量部程度である。無官能シリコーンオイル(可塑剤)の配合量が0.1質量部より少ないと添加の目的である可塑化が得られない場合があり、20質量部より多いと硬化後の材料から可塑剤が分離、ブリードしてしまう場合がある。
[Plasticizer]
In the composition of the present invention, as a plasticizer for adjusting the viscosity of the composition and the hardness of the cured product (silicone rubber foam), hydrosilylation addition reactions such as alkenyl groups and hydrosilyl groups (SiH groups) are added to the molecule. Dimethylpolysiloxane (dimethylsilicone oil) with trimethylsilyl group-blocked at both molecular chain ends, dimethylsiloxane/diphenylsiloxane copolymer with trimethylsilyl groups at both molecular chain ends, and dimethyl group-blocked with trimethylsilyl groups at both molecular chain ends, which do not contain functional groups involved in So-called non-functional silicone oil such as siloxane/methylphenylsiloxane copolymer (methylphenyl silicone oil) can be blended. Among these, in the present invention, those containing a phenyl group are more preferable from the viewpoint of being completely compatible with the above-mentioned components (A) to (C) and exhibiting transparency at 40°C.
When blending this non-functional silicone oil (plasticizer), the blending amount is preferably 0.1 to 20 parts by mass, more preferably 0.5 to 10 parts by mass, per 100 parts by mass of component (A). It is about 100%. If the amount of non-functional silicone oil (plasticizer) is less than 0.1 part by mass, the intended plasticization may not be achieved, and if it is more than 20 parts by mass, the plasticizer may separate from the cured material. , it may bleed.
〔顔料〕
本発明の組成物には、上記した可塑剤としての無官能シリコーンオイルと同様の成分をバインダーとして使用した顔料ペーストなどを添加してもよい。なお、顔料ペースト中の樹脂成分(液状成分)は本発明の透明性((A)成分等との十分な相溶性)の要件の対象であるが、顔料粉末(無機顔料粉末及び有機無機顔料粉末)自体は、無機質充填剤と同様に、本発明の透明性((A)成分等との十分な相溶性)の要件の対象外である。
[Pigment]
The composition of the present invention may include a pigment paste using the same components as the above-mentioned non-functional silicone oil as a plasticizer as a binder. The resin component (liquid component) in the pigment paste is subject to the requirements of transparency (sufficient compatibility with component (A), etc.) of the present invention, but pigment powder (inorganic pigment powder and organic-inorganic pigment powder) ) itself is not subject to the requirements of transparency (sufficient compatibility with component (A) etc.) of the present invention, similarly to inorganic fillers.
〔無機質充填剤〕
本発明の組成物には、未硬化時の粘度調整、硬化後の強度向上、外観色調整のために、ヒュームドシリカ、ヒュームド二酸化チタン等の補強性無機質充填剤;補強性のシリコーンレジン;ケイ酸カルシウム、二酸化チタン、酸化第二鉄、カーボンブラック等の非補強性無機質充填剤を添加することができる。
[Inorganic filler]
The composition of the present invention contains reinforcing inorganic fillers such as fumed silica and fumed titanium dioxide; reinforcing silicone resin; silicone resin; Non-reinforcing inorganic fillers such as calcium oxide, titanium dioxide, ferric oxide, and carbon black can be added.
また、有機過酸化物から有機酸が発生する場合には、カルシウム・亜鉛・マグネシウム等のアルカリ土類金属の炭酸塩、酸化物、水酸化物に代表される塩基性無機質充填剤を添加して電気特性を向上させることも可能である。 In addition, when organic acids are generated from organic peroxides, basic inorganic fillers such as carbonates, oxides, and hydroxides of alkaline earth metals such as calcium, zinc, and magnesium may be added. It is also possible to improve electrical properties.
これらの無機質充填剤の使用量は、通常、(A)成分100質量部に対して、0~200質量部であり、配合する場合は、(A)成分100質量部に対して0.1~200質量部であることが好ましく、より好ましくは0.5~50質量部である。無機質充填剤の使用量が0.1質量部未満では添加効果が得られない場合があり、200質量部を超えると混合物として均一に混合することが困難となる場合がある。 The amount of these inorganic fillers used is usually 0 to 200 parts by weight per 100 parts by weight of component (A), and when blended, the amount used is 0.1 to 200 parts by weight per 100 parts by weight of component (A). The amount is preferably 200 parts by weight, more preferably 0.5 to 50 parts by weight. If the amount of the inorganic filler used is less than 0.1 parts by mass, the addition effect may not be obtained, and if it exceeds 200 parts by mass, it may be difficult to mix uniformly as a mixture.
上述した成分の中で、無機質充填剤(及び顔料粉末)を除いた成分である(A)成分、(B)成分、(C)成分及びその他の各任意成分である液状成分添加物は、これら成分中の液状成分がお互いに相溶し、この無機質充填剤を除いた成分を混合して得られる混和物が40℃にて透明でなければならない。これらの成分中に非相溶の液状物質が液滴として存在すると、組成物を機械発泡装置によりガスを加圧混入し機械的に発泡・硬化させた際に、上記混和物全体としての泡保持性が極端に低下し、所望の高発泡化が困難となる。このため、無機質充填剤を除いた成分を混合した場合に、これら成分中の液状成分が相溶化し、得られる混和物が40℃にて透明性を有していることが重要となる。
なお、混和物が透明性を有しているとは、40℃における混和物中に、目視で白濁などの濁りが認められないことをいう。
Among the above-mentioned components, components (A), (B), and (C), which are components other than the inorganic filler (and pigment powder), and other optional components, such as liquid component additives, are The liquid components in the components must be compatible with each other, and the mixture obtained by mixing the components excluding the inorganic filler must be transparent at 40°C. If an incompatible liquid substance exists as droplets in these components, when the composition is mechanically foamed and hardened by pressurizing gas into the composition using a mechanical foaming device, the foam retention of the mixture as a whole may be reduced. The properties are extremely reduced, making it difficult to achieve the desired high foaming level. For this reason, when the components excluding the inorganic filler are mixed, it is important that the liquid components in these components become compatible and that the resulting mixture has transparency at 40°C.
In addition, the mixture having transparency means that no turbidity such as white turbidity is visually observed in the mixture at 40°C.
[機械発泡用硬化性液状シリコーンゴム発泡体組成物]
本発明の機械発泡用硬化性液状シリコーンゴム発泡体組成物は、通常の硬化性シリコーンゴム発泡体組成物と同様に、2液に分け、使用時にこの2液を混合して硬化させる所謂2液型の組成物でもよいが、作業性を考慮すると1液型が好ましい。
本発明の組成物が1液型の場合、上記(A)~(C)成分、及び必要に応じて上記各種の任意成分を常法に準じて混合することにより、調製することができる。
[Curable liquid silicone rubber foam composition for mechanical foaming]
The curable liquid silicone rubber foam composition for mechanical foaming of the present invention is a so-called two-component product that is divided into two parts and mixed and cured at the time of use, similar to ordinary curable silicone rubber foam compositions. Although a type composition may be used, a one-component type is preferable in consideration of workability.
When the composition of the present invention is a one-pack type, it can be prepared by mixing the components (A) to (C) described above, and, if necessary, the various optional components described above, according to a conventional method.
本発明の機械発泡用硬化性液状シリコーンゴム発泡体組成物の23℃における粘度は、1~10,000Pa・s(1,000~10,000,000mPa・s)であることが好ましく、5~500Pa・s(5,000~500,000mPa・s)であることがより好ましい。23℃における粘度が、上記下限値未満であると加熱硬化中に泡が壊れてしまう場合があり、上記上限値を超えると機械発泡装置中の混合熱で材料の硬化反応が始まってしまい、硬化後に所望の泡状態(スポンジ)が得られない場合がある。 The viscosity of the curable liquid silicone rubber foam composition for mechanical foaming of the present invention at 23°C is preferably 1 to 10,000 Pa·s (1,000 to 10,000,000 mPa·s), and preferably 5 to 10,000,000 mPa·s. More preferably, it is 500 Pa·s (5,000 to 500,000 mPa·s). If the viscosity at 23°C is less than the above lower limit, the foam may break during heat curing, and if it exceeds the above upper limit, the material will begin to harden due to the heat of mixing in the mechanical foaming device, resulting in hardening. The desired foam state (sponge) may not be obtained afterwards.
[シリコーンゴム発泡体]
本発明の機械発泡用硬化性液状シリコーンゴム発泡体組成物の硬化物からなるシリコーンゴム発泡体は、前記機械発泡用硬化性液状シリコーンゴム発泡体組成物を機械発泡装置により発泡・硬化して得られるものである。
[Silicone rubber foam]
The silicone rubber foam made of the cured product of the curable liquid silicone rubber foam composition for mechanical foaming of the present invention is obtained by foaming and curing the curable liquid silicone rubber foam composition for mechanical foaming using a mechanical foaming device. It is something that can be done.
機械発泡装置による発泡条件としては、
第一に、未硬化液状材料(機械発泡用硬化性液状シリコーンゴム発泡体組成物)に気体を圧入しながら混合することで、該材料中に気体が溶けた状態、もしくは微小泡の状態で未硬化液状材料中に気体成分が包含される状態とする工程、
第二に、該状態の未硬化液状材料が常圧下に吐出されることで、該未硬化液状材料中に包含していた気体成分が機械的に(物理的に)泡状となる工程、
第三に、該状態の未硬化液状材料を硬化させる工程
からなり、所望の部位、形状に、スポンジ状シリコーンゴムを硬化させる方法である。
気体は、空気、窒素、二酸化炭素、酸素等でよく、また該気体は脱水されていてもされていなくてもよい。
また、材料自体から化学反応により自発的に水素、窒素等のガスを発生させること(即ち、機械的(物理的)発泡システムと化学的発泡システムを併用すること)も可能ではあるが、自発的ガス発生(化学的発泡システムの併用)は任意である。
良質なスポンジ状態(発泡状態)の硬化物を得るためには、第二の工程から第三の工程の間に生成された気泡が破泡することなくより完全に維持(保持)された状態のまま硬化に至ることが重要であり、本発明はこの泡を保持する性能に優れた材料を提供するための技術である。
第一の工程では、一般的に混合により発熱する傾向があるが、材料がその工程で硬化するのを防ぐため、40~50℃を保つように設計されている。
The foaming conditions using the mechanical foaming device are as follows:
First, by mixing gas while pressurizing it into an uncured liquid material (curable liquid silicone rubber foam composition for mechanical foaming), the gas is dissolved in the material or in the form of microbubbles. a step of bringing a gas component into a state in which the cured liquid material is included;
secondly, a step in which the uncured liquid material in this state is discharged under normal pressure, so that the gas component contained in the uncured liquid material mechanically (physically) becomes foamy;
The third method is a method of curing the uncured liquid material in the above state, and curing the sponge-like silicone rubber into a desired region and shape.
The gas may be air, nitrogen, carbon dioxide, oxygen, etc., and the gas may or may not be dehydrated.
It is also possible to spontaneously generate gases such as hydrogen and nitrogen from the material itself through a chemical reaction (i.e., by using both a mechanical (physical) foaming system and a chemical foaming system); Gas generation (in conjunction with a chemical foaming system) is optional.
In order to obtain a cured product in a high-quality sponge state (foamed state), it is necessary to maintain (retain) the air bubbles generated between the second and third steps more completely without bursting. It is important that the foam is cured as it is, and the present invention is a technology for providing a material that has excellent foam retention properties.
The first step generally tends to generate heat due to mixing, but it is designed to maintain the temperature at 40 to 50°C to prevent the material from hardening during that step.
また、機械発泡装置による硬化条件としては、公知の加熱硬化型シリコーンゴム発泡体組成物と同様でよく、必要に応じた室温より高い温度(例えば20~180℃、好ましくは20~150℃)で加熱硬化することができる。
一般的には発泡硬化は常圧下(1気圧下)で行われることが多いが、必要とする発泡状態、形状の硬化物(スポンジ)を得るためには、常圧以外の環境で機械発泡(物理発泡)を行ってもよい。機械発泡(物理発泡)は、注型後の自由発泡硬化や、型の中での成型硬化にも適用できる。
Furthermore, the curing conditions using a mechanical foaming device may be the same as those for known heat-curable silicone rubber foam compositions, and may be performed at a temperature higher than room temperature (for example, 20 to 180°C, preferably 20 to 150°C) as necessary. Can be cured by heating.
Generally, foam curing is often performed under normal pressure (1 atm), but in order to obtain a cured product (sponge) with the required foam state and shape, it is necessary to perform mechanical foaming in an environment other than normal pressure. Physical foaming) may also be performed. Mechanical foaming (physical foaming) can also be applied to free foam curing after casting and molding curing in a mold.
このようにして得られた本発明の機械発泡用硬化性液状シリコーンゴム発泡体組成物の硬化物からなるシリコーンゴム発泡体は、耐熱性、電気絶縁性に優れる。
本発明の機械発泡用硬化性液状シリコーンゴム発泡体組成物及びその硬化物(シリコーンゴム発泡体)は、車載部品、航空機や、家電製品等に応用可能である。
The silicone rubber foam made of the cured product of the curable liquid silicone rubber foam composition for mechanical foaming of the present invention thus obtained has excellent heat resistance and electrical insulation.
The curable liquid silicone rubber foam composition for mechanical foaming of the present invention and its cured product (silicone rubber foam) can be applied to automotive parts, aircraft, home appliances, and the like.
以下に、実施例及び比較例を示し、本発明を更に具体的に説明するが、本発明は下記の実施例に制限されるものではない。なお、下記の例において、粘度は回転粘度計により測定した23℃における値を示す。 EXAMPLES Below, the present invention will be explained in more detail by showing examples and comparative examples, but the present invention is not limited to the following examples. In addition, in the following examples, the viscosity indicates the value at 23° C. measured by a rotational viscometer.
[実施例1~5、比較例1~3]
目的の硬化性液状シリコーンゴム発泡体組成物において、無機質充填剤を除いた成分中の液状成分が相溶してこの無機質充填剤を除いた成分の混和物が40℃にて透明であるかが重要であるため、目的の硬化性液状シリコーンゴム発泡体組成物及び無機質充填剤を除いた成分の混和物(該組成物において無機質充填剤を配合しない組成物)を作製し、これら組成物及び混和物の透明性等を評価した。また、無機質充填剤を除いた成分中の液状成分が非相溶であることによってこの混和物が非透明になる例として、アルケニル基非含有のジオルガノポリシロキサン及び各種可塑剤を用い、同様に評価した。具体的には、下記原料を使用し、下記に示す方法により組成物及び混和物を作製し、これら組成物及び混和物について下記に示す方法により評価し、検討を行った。
[Examples 1 to 5, Comparative Examples 1 to 3]
In the target curable liquid silicone rubber foam composition, check whether the liquid components in the components excluding the inorganic filler are compatible and the mixture of the components excluding the inorganic filler is transparent at 40 ° C. Since this is important, a mixture of the target curable liquid silicone rubber foam composition and the components excluding the inorganic filler (a composition in which no inorganic filler is blended in the composition) is prepared, and these compositions and the mixture are The transparency of the object was evaluated. In addition, as an example in which the mixture becomes non-transparent due to the incompatibility of the liquid components in the components excluding the inorganic filler, we used a diorganopolysiloxane containing no alkenyl group and various plasticizers, and similarly evaluated. Specifically, compositions and mixtures were prepared using the following raw materials by the methods shown below, and these compositions and mixtures were evaluated and studied by the methods shown below.
(A)アルケニル基含有ジオルガノポリシロキサン(液状成分)
(A-1)下記式で示される23℃下での粘度が20,100mPa・sであるビニル基、フェニル基含有の直鎖状ジオルガノポリシロキサン
(A-1) Vinyl group- and phenyl group-containing linear diorganopolysiloxane having a viscosity of 20,100 mPa·s at 23°C represented by the following formula
(A-2)下記式で示される23℃下での粘度が5,200mPa・sであるビニル基、フェニル基含有の直鎖状ジオルガノポリシロキサン
(a-1)下記式で示される23℃下での粘度が9,800mPa・sであるビニル基含有、フェニル基非含有の直鎖状ジオルガノポリシロキサン
(B)オルガノハイドロジェンポリシロキサン(液状成分)
下記式で示される直鎖状オルガノハイドロジェンポリシロキサン
Linear organohydrogenpolysiloxane represented by the following formula
(C)白金族金属系触媒(溶液成分)
白金-ジビニルテトラメチルジシロキサン錯体/トルエン溶液(白金原子含有量0.5質量%)
(C) Platinum group metal catalyst (solution component)
Platinum-divinyltetramethyldisiloxane complex/toluene solution (platinum atom content 0.5% by mass)
(D)反応制御剤(液状成分)
エチニルシクロヘキサノール/50質量%トルエン溶液
(D) Reaction control agent (liquid component)
Ethynylcyclohexanol/50% by mass toluene solution
(E)無機質充填剤(固体成分)
疎水性フュームドシリカ(アエロジル R8200、日本アエロジル(株)製)
(E) Inorganic filler (solid component)
Hydrophobic fumed silica (Aerosil R8200, manufactured by Nippon Aerosil Co., Ltd.)
(F)可塑剤(液状成分)
(F-1)下記式で示される23℃下での粘度が4,500mPa・sであるフェニル基含有の直鎖状オルガノポリシロキサン
(F-1) A phenyl group-containing linear organopolysiloxane having a viscosity of 4,500 mPa·s at 23°C represented by the following formula
(F-2)下記式で示される23℃下での粘度が3,400mPa・sであるフェニル基非含有の直鎖状オルガノポリシロキサン
(F-3)下記式で示される23℃下での粘度が600mPa・sであるフェニル基非含有の直鎖状オルガノポリシロキサン
(G)接着性付与剤(液状成分)
下記式で示されるシランカップリング剤 KBM-403(信越化学工業(株)製)
(G) Adhesive agent (liquid component)
Silane coupling agent KBM-403 represented by the following formula (manufactured by Shin-Etsu Chemical Co., Ltd.)
上記の原料を表1に示す量で用い、減圧混合が可能な品川万能混合機(3L)によって混練を行い、無機質充填剤を有する硬化性液状シリコーンゴム発泡体組成物及び該組成物から無機質充填剤を除いた成分の混和物を得た。
(E)成分である無機質充填剤を添加する硬化性液状シリコーンゴム発泡体組成物の場合には、まず(A)成分《(A-1)、(A-2)又は(a-1)》と(E)成分とを30℃、300Paの条件にて30分間減圧混合処理し、そこに(C)成分、(D)成分、(B)成分、(F)成分《(F-1)、(F-2)又は(F-3)》、(G)成分の順で添加し、室温(23℃)、常圧にて30分間混合を行った。
(E)成分である無機質充填剤を添加しない混和物の場合には、(A)成分《(A-1)、(A-2)又は(a-1)》、(C)成分、(D)成分、(B)成分、(F)成分《(F-1)、(F-2)又は(F-3)》、(G)成分の順で添加し、室温(23℃)、常圧にて30分間混合を行った。
The above raw materials were used in the amounts shown in Table 1 and kneaded using a Shinagawa universal mixer (3L) capable of mixing under reduced pressure to produce a curable liquid silicone rubber foam composition containing an inorganic filler and an inorganic filler from the composition. A mixture of components excluding the agent was obtained.
In the case of a curable liquid silicone rubber foam composition in which an inorganic filler as component (E) is added, first component (A) ((A-1), (A-2) or (a-1)) is added. and (E) component were mixed under reduced pressure at 30°C and 300 Pa for 30 minutes, and the (C) component, (D) component, (B) component, (F) component [(F-1), (F-2) or (F-3)'' and component (G) were added in this order, and mixed for 30 minutes at room temperature (23°C) and normal pressure.
In the case of a mixture in which no inorganic filler, which is component (E), is added, component (A) ((A-1), (A-2) or (a-1)), component (C), (D ) component, (B) component, (F) component <<(F-1), (F-2) or (F-3)>>>, and (G) component in this order, at room temperature (23°C) and normal pressure. Mixing was performed for 30 minutes.
上記で得られた硬化性液状シリコーンゴム発泡体組成物及び混和物を用いて、透明性、粘度、硬化物の硬さ、発泡性、泡保持性を下記に示す方法により評価した。結果を表1に併記する。 Using the curable liquid silicone rubber foam composition and mixture obtained above, transparency, viscosity, hardness of cured product, foamability, and foam retention were evaluated by the methods shown below. The results are also listed in Table 1.
〔透明性〕
透明性(外観)は、上記で得られた硬化性液状シリコーンゴム発泡体組成物及び混和物を透明なガラス瓶(直径4cm)に入れ、該組成物及び混和物の23℃における透明性を目視にて確認し、下記の基準で評価した。
サンプルが入ったガラス瓶の背後に、MS明朝6ポイントの『A』(黒・半角)を印刷した白紙を置き、
透明:『A』が読み取れる状態。
濁 :『A』が読み取れない状態。
〔transparency〕
Transparency (appearance) was determined by placing the curable liquid silicone rubber foam composition and mixture obtained above in a transparent glass bottle (4 cm in diameter) and visually observing the transparency of the composition and mixture at 23°C. and evaluated based on the following criteria.
Place a blank sheet of paper with the MS Mincho 6-point "A" (black, half-width) printed on it behind the glass bottle containing the sample.
Transparent: State where "A" can be read.
Cloudy: A state in which "A" cannot be read.
〔粘度〕
粘度は、上記で得られた硬化性液状シリコーンゴム発泡体組成物及び混和物の23℃における粘度を回転粘度計で測定した。
〔viscosity〕
The viscosity was determined by measuring the viscosity of the curable liquid silicone rubber foam composition and mixture obtained above at 23°C using a rotational viscometer.
〔硬化物の硬さ〕
硬度は、上記で得られた硬化性液状シリコーンゴム発泡体組成物及び混和物を無発泡の状態で2mmシートを成形(120℃×30分)し、このシートを3枚重ねにしてJIS K-6249に規定されるデュロメーターA硬度計を用いて測定した。
[Hardness of cured product]
The hardness was determined by molding the curable liquid silicone rubber foam composition and mixture obtained above into a 2 mm sheet in an unfoamed state (120°C x 30 minutes), stacking 3 of these sheets and JIS K- The hardness was measured using a Durometer A hardness tester specified in 6249.
〔発泡性〕
発泡性は、上記で得られた硬化性液状シリコーンゴム発泡体組成物及び混和物を攪拌へらを用いて5分間手混合により混合して、空気混合物を作製した。得られた空気混合物(10g)を減圧容器内で常圧~10kPaの減圧条件にて減圧し、破泡するまでの最大体積を測定し、その倍率(最大体積/初期体積)を示した。
[Foamability]
Foaming properties were determined by mixing the curable liquid silicone rubber foam composition obtained above and the mixture by hand using a stirring spatula for 5 minutes to prepare an air mixture. The resulting air mixture (10 g) was depressurized in a vacuum container under reduced pressure conditions of normal pressure to 10 kPa, the maximum volume until bubbles burst was measured, and its magnification (maximum volume/initial volume) was shown.
〔泡保持性〕
泡保持性は、発泡性と同様にして得られた空気混合物(10g)を減圧容器内で約30mlとなるまで減圧し、その減圧度を維持した状態で、破泡に至る時間(体積減少の確認)を測定した。
[Foam retention]
Foam retention is measured by reducing the pressure of an air mixture (10 g) obtained in the same manner as for foaming in a vacuum container until the volume becomes approximately 30 ml, and measuring the time required for bubbles to break (of volume reduction) while maintaining the degree of vacuum. confirmation) was measured.
表1に示すとおり、主成分であるアルケニル基含有ジオルガノポリシロキサンにフェニル基が存在し、かつ無機質充填剤を除いた液状成分の混和物が40℃にて透明である場合にのみ、無機質充填剤を配合した後の組成物全体に関しても、良好な発泡倍率、泡保持性を示すことが確認できる。
また、実施例1~5及び比較例1~3と同様の組成物を用いて、機械発泡装置を使用して常圧下で機械発泡(物理発泡)させた場合にも、同様の結果(無機質充填剤以外の液状成分の混和物が透明であるものだけが、無機質充填剤を配合した後の組成物全体に関しても、組成物全体としての泡保持性に優れ、硬化後も良好な発泡倍率、スポンジ状態となること)が確認された。
As shown in Table 1, only when phenyl groups exist in the alkenyl group-containing diorganopolysiloxane, which is the main component, and when the mixture of liquid components excluding the inorganic filler is transparent at 40°C, the inorganic filler It can be confirmed that the entire composition after blending the agent also exhibits good expansion ratio and foam retention.
In addition, similar results (inorganic filled Only those in which the mixture of liquid components other than the agent is transparent will have excellent foam retention properties as a whole, even after the inorganic filler has been blended, and will have a good foaming ratio and sponge property even after curing. condition) was confirmed.
Claims (5)
(B)1分子中に少なくとも3個のケイ素原子に結合した水素原子を有するオルガノハイドロジェンポリシロキサン:0.1~20質量部、及び
(C)白金族金属系触媒:(A)、(B)成分の合計質量に対し、白金原子の質量換算で0.1~1,000ppm
を含有し、かつ無機質充填剤を除いた成分の混和物が40℃で透明である機械発泡用硬化性液状シリコーンゴム発泡体組成物。 (A) Diorganopolysiloxane having at least two alkenyl groups and one or more phenyl groups in one molecule: 100 parts by mass,
(B) organohydrogenpolysiloxane having at least three hydrogen atoms bonded to silicon atoms in one molecule: 0.1 to 20 parts by mass, and (C) platinum group metal catalyst: (A), (B) ) 0.1 to 1,000 ppm in terms of mass of platinum atoms based on the total mass of components
A curable liquid silicone rubber foam composition for mechanical foaming, wherein the mixture of the components excluding the inorganic filler is transparent at 40°C.
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