JP5377846B2 - 熱硬化性シリコーンゴム組成物 - Google Patents
熱硬化性シリコーンゴム組成物 Download PDFInfo
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- JP5377846B2 JP5377846B2 JP2007291733A JP2007291733A JP5377846B2 JP 5377846 B2 JP5377846 B2 JP 5377846B2 JP 2007291733 A JP2007291733 A JP 2007291733A JP 2007291733 A JP2007291733 A JP 2007291733A JP 5377846 B2 JP5377846 B2 JP 5377846B2
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- 239000000203 mixture Substances 0.000 title claims description 28
- 229920002379 silicone rubber Polymers 0.000 title claims description 17
- 239000004945 silicone rubber Substances 0.000 title claims description 16
- 229920001187 thermosetting polymer Polymers 0.000 title claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 24
- 229920001296 polysiloxane Polymers 0.000 claims description 24
- 125000003342 alkenyl group Chemical group 0.000 claims description 22
- 229910052710 silicon Inorganic materials 0.000 claims description 14
- 239000011256 inorganic filler Substances 0.000 claims description 12
- 229910003475 inorganic filler Inorganic materials 0.000 claims description 12
- 239000003054 catalyst Substances 0.000 claims description 10
- 238000006116 polymerization reaction Methods 0.000 claims description 10
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 9
- 125000000962 organic group Chemical group 0.000 claims description 5
- 238000007259 addition reaction Methods 0.000 claims description 4
- 125000001931 aliphatic group Chemical group 0.000 claims description 4
- 239000007809 chemical reaction catalyst Substances 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000006229 carbon black Substances 0.000 claims description 3
- 239000010453 quartz Substances 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 229910044991 metal oxide Inorganic materials 0.000 claims description 2
- 150000004706 metal oxides Chemical class 0.000 claims description 2
- 229920006136 organohydrogenpolysiloxane Polymers 0.000 claims description 2
- -1 polysiloxane Polymers 0.000 description 23
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 17
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 13
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 125000001183 hydrocarbyl group Chemical group 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- QYLFHLNFIHBCPR-UHFFFAOYSA-N 1-ethynylcyclohexan-1-ol Chemical compound C#CC1(O)CCCCC1 QYLFHLNFIHBCPR-UHFFFAOYSA-N 0.000 description 4
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000003431 cross linking reagent Substances 0.000 description 4
- 125000004122 cyclic group Chemical group 0.000 description 4
- 239000004205 dimethyl polysiloxane Substances 0.000 description 4
- 235000013870 dimethyl polysiloxane Nutrition 0.000 description 4
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 4
- 229910052697 platinum Inorganic materials 0.000 description 4
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 125000003118 aryl group Chemical group 0.000 description 3
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 description 3
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 3
- 125000004218 chloromethyl group Chemical group [H]C([H])(Cl)* 0.000 description 3
- 238000013329 compounding Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 3
- 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 3
- 125000001624 naphthyl group Chemical group 0.000 description 3
- 125000001147 pentyl group Chemical group C(CCCC)* 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 3
- 125000003944 tolyl group Chemical group 0.000 description 3
- 125000005023 xylyl group Chemical group 0.000 description 3
- 125000001731 2-cyanoethyl group Chemical group [H]C([H])(*)C([H])([H])C#N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
- 125000003710 aryl alkyl group Chemical group 0.000 description 2
- 229920005601 base polymer Polymers 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000007796 conventional method Methods 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
- 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 2
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 2
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 2
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 125000001971 neopentyl group Chemical group [H]C([*])([H])C(C([H])([H])[H])(C([H])([H])[H])C([H])([H])[H] 0.000 description 2
- 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 2
- 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 2
- 125000000286 phenylethyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])C([H])([H])* 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 2
- WGTYBPLFGIVFAS-UHFFFAOYSA-M tetramethylammonium hydroxide Chemical compound [OH-].C[N+](C)(C)C WGTYBPLFGIVFAS-UHFFFAOYSA-M 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- OWXJKYNZGFSVRC-UHFFFAOYSA-N 1-chloroprop-1-ene Chemical group CC=CCl OWXJKYNZGFSVRC-UHFFFAOYSA-N 0.000 description 1
- VMAWODUEPLAHOE-UHFFFAOYSA-N 2,4,6,8-tetrakis(ethenyl)-2,4,6,8-tetramethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane Chemical compound C=C[Si]1(C)O[Si](C)(C=C)O[Si](C)(C=C)O[Si](C)(C=C)O1 VMAWODUEPLAHOE-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
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 1
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- WDJHALXBUFZDSR-UHFFFAOYSA-M acetoacetate Chemical compound CC(=O)CC([O-])=O WDJHALXBUFZDSR-UHFFFAOYSA-M 0.000 description 1
- 239000003377 acid catalyst Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 description 1
- 239000012964 benzotriazole Substances 0.000 description 1
- SESFRYSPDFLNCH-UHFFFAOYSA-N benzyl benzoate Chemical compound C=1C=CC=CC=1C(=O)OCC1=CC=CC=C1 SESFRYSPDFLNCH-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 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
- 125000004369 butenyl group Chemical group C(=CCC)* 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 125000004093 cyano group Chemical group *C#N 0.000 description 1
- 125000000596 cyclohexenyl group Chemical group C1(=CCCCC1)* 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 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 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011067 equilibration Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910021485 fumed silica Inorganic materials 0.000 description 1
- 125000001188 haloalkyl group Chemical group 0.000 description 1
- 150000002366 halogen compounds Chemical class 0.000 description 1
- 125000005843 halogen group Chemical group 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
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 125000000555 isopropenyl group Chemical group [H]\C([H])=C(\*)C([H])([H])[H] 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 125000004365 octenyl group Chemical group C(=CCCCCCC)* 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 125000004344 phenylpropyl group Chemical group 0.000 description 1
- CLSUSRZJUQMOHH-UHFFFAOYSA-L platinum dichloride Chemical compound Cl[Pt]Cl CLSUSRZJUQMOHH-UHFFFAOYSA-L 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 125000004368 propenyl group Chemical group C(=CC)* 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000012763 reinforcing filler Substances 0.000 description 1
- 239000010948 rhodium Substances 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- SCPYDCQAZCOKTP-UHFFFAOYSA-N silanol Chemical compound [SiH3]O SCPYDCQAZCOKTP-UHFFFAOYSA-N 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 125000000725 trifluoropropyl group Chemical group [H]C([H])(*)C([H])([H])C(F)(F)F 0.000 description 1
Classifications
-
- 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
-
- 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
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
- C08K3/013—Fillers, pigments or reinforcing additives
-
- 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
- C08K3/02—Elements
- C08K3/04—Carbon
-
- 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
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/56—Organo-metallic compounds, i.e. organic compounds containing a metal-to-carbon bond
-
- 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
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
(A)一分子中に少なくとも2個の珪素原子と結合するアルケニル基を含有するオルガノポリシロキサン:20〜80質量部、
(B)珪素素原子に結合するアルケニル基が、一分子中に平均0.1個以上2個未満存在し、珪素原子に結合する残余の有機基が脂肪族不飽和結合を含まぬ置換または非置換の1価の炭化水素基であり、23℃における粘度が0.05〜100Pa・sであるオルガノポリシロキサン:20〜80質量部、
(但し、(A)、(B)成分の合計は100質量部である。)
(C)一分子中に少なくとも2個の珪素原子と結合する水素原子を含有するオルガノハイドロジェンポリシロキサン:(A)及び(B)成分中のアルケニル基1モルに対して(C)成分中の珪素原子結合水素原子が0.1〜10モルとなる量
(D)無機充填剤:5〜500質量部、
(E)付加反応触媒:触媒量
を含有してなり、室温で液状であることを特徴とする熱硬化性シリコーンゴム組成物である。
式中、Rは互いに同一又は異種の炭素数1〜10、好ましくは1〜8の非置換又は置換一価炭化水素基であり、aは1.5〜2.8、好ましくは1.8〜2.5、より好ましくは1.95〜2.05の範囲の正数である。
特に制約を受けるものではないが、(A)成分を構成するオルガノポリシロキサンの構成としては、この生ゴム状のポリシロキサンが10〜40質量部(残りのポリオルガノシロキサンが40〜70質量部)、好ましくは、10〜30質量部(残りが50〜70質量部)である。
硬度の評価は、JISA硬度計を用い、JISK6249に準拠し評価した。
密度の評価は、JISK6249に準拠し評価した。
粘度は、B型回転粘度計による見かけ粘度として測定した。
経時後の評価は、配合した組成物に対して、保管容器の上澄みをとり同様に評価測定した。
両末端がトリメチルシロキシ基で封鎖され側鎖にビニル基を有する生ゴム状ジメチルポリシロキサン(重合度8,000、ビニル基含有量0.08mmol/g)30部、両末端がトリメチルシロキシ基で封鎖され側鎖にビニル基を有するモノビニル基含有ポリシロキサン(粘度約1000cP、ビニル基含有量0.05mmol/g)70部、粉砕石英(龍森工業製、クリスタライトVX−S)50部をプラネタリーミキサーに入れ、30分間撹拌を続けた後、3本ロールに1回通した。その後、架橋剤として両末端及び側鎖にSi−H基を有するメチルハイドロジェンポリシロキサン(重合度17、Si−H量6.0mmol/g)4部、反応制御剤としてエチニルシクロヘキサノール0.1部、白金触媒(Pt濃度1%)0.1部を添加し、15分間撹拌を続けてシリコーンゴム組成物を得た。この組成物の室温(25℃)での粘度をBH型粘度計、ローター7番を使用し、10rpmの条件で測定した。また、硬さと密度を測定した。更に、この組成物を6ヶ月室温で保存後に、粘度、硬さ、密度を測定した。結果を表1に記した。
両末端がトリメチルシロキシ基で封鎖され側鎖にビニル基を有するジメチルポリシロキサン(粘度約1000cP、ビニル基含有量0.1mmol/g)75部、両末端がトリメチルシロキシ基で封鎖され側鎖にビニル基を有する生ゴム状ジメチルポリシロキサン(重合度8,000、ビニル基含有量0.08mmol/g)5部、両末端がトリメチルシロキシ基で封鎖され側鎖にビニル基を有するモノビニル基含有ポリシロキサン(粘度約1000cP、ビニル基含有量0.05mmol/g)20部、酸化亜鉛(ハクスイテック製、酸化亜鉛2種)200部をプラネタリーミキサーに入れ、30分間撹拌を続けた後、3本ロールに1回通した。その後、架橋剤として両末端及び側鎖にSi−H基を有するメチルハイドロジェンポリシロキサン(重合度17、Si−H量6.0mmol/g)7部、反応制御剤としてエチニルシクロヘキサノール0.1部、白金触媒(Pt濃度1%)0.1部を添加し、15分間撹拌を続けてシリコーンゴム組成物を得て、実施例1と同様に評価した。
両末端がトリメチルシロキシ基で封鎖され側鎖にビニル基を有する生ゴム状ジメチルポリシロキサン(重合度8,000、ビニル基含有量0.08mmol/g)20部、両末端がトリメチルシロキシ基で封鎖され側鎖にビニル基を有するモノビニル基含有ポリシロキサン(粘度約1000cP、ビニル基含有量0.05mmol/g)80部、カーボンブラック(電気化学工業製、デンカブラック)25部をプラネタリーミキサーに入れ、30分間撹拌を続けた後、3本ロールに1回通した。その後、架橋剤として両末端及び側鎖にSi−H基を有するメチルハイドロジェンポリシロキサン(重合度17、Si−H量6.0mmol/g)5部、反応制御剤としてエチニルシクロヘキサノール0.1部、白金触媒(Pt濃度1%)0.1部を添加し、15分間撹拌を続けてシリコーンゴム組成物を得て、実施例1と同様に評価した。
表1に示すように、モノビニル基含有ポリシロキサンを配合しない以外は実施例1〜3と同様の組成にて組成物を得て、実施例1と同様に評価した。
Claims (2)
- (A)一分子中に少なくとも2個の珪素原子と結合するアルケニル基を含有する、重合度が3000以上の生ゴム状のオルガノポリシロキサン:20〜30質量部、
(B)珪素原子に結合するアルケニル基が、一分子中に平均0.1個以上2個未満存在し、珪素原子に結合する残余の有機基が脂肪族不飽和結合を含まぬ置換または非置換の1価の炭化水素基であり、23℃における粘度が0.05〜100Pa・sであるオルガノポリシロキサン:70〜80質量部、
(但し、(A)、(B)成分の合計は100質量部である。)
(C)一分子中に少なくとも2個の珪素原子と結合する水素原子を含有するオルガノハイドロジェンポリシロキサン:(A)及び(B)成分中のアルケニル基1モルに対して(C)成分中の珪素原子結合水素原子が0.1〜10モルとなる量
(D)無機充填剤:5〜500質量部、
(E)付加反応触媒:触媒量を含有してなり、室温(23℃)における粘度が50〜800Pa・sの範囲で液状であることを特徴とする熱硬化性シリコーンゴム組成物。 - (D)無機充填剤が、粉砕石英、金属酸化物及びカーボンブラックより選ばれる1種又は2種以上である請求項1記載の熱硬化性シリコーンゴム組成物。
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