JP2023119641A - Room temperature curable silicone rubber composition - Google Patents
Room temperature curable silicone rubber composition Download PDFInfo
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- JP2023119641A JP2023119641A JP2022022608A JP2022022608A JP2023119641A JP 2023119641 A JP2023119641 A JP 2023119641A JP 2022022608 A JP2022022608 A JP 2022022608A JP 2022022608 A JP2022022608 A JP 2022022608A JP 2023119641 A JP2023119641 A JP 2023119641A
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- 239000000203 mixture Substances 0.000 title claims abstract description 45
- 229920002379 silicone rubber Polymers 0.000 title claims abstract description 42
- 239000004945 silicone rubber Substances 0.000 title claims abstract description 42
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims abstract description 29
- 229920001296 polysiloxane Polymers 0.000 claims abstract description 28
- 238000006459 hydrosilylation reaction Methods 0.000 claims abstract description 13
- 239000007809 chemical reaction catalyst Substances 0.000 claims abstract description 9
- 229910052751 metal Inorganic materials 0.000 claims abstract description 8
- 239000002184 metal Substances 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 229920006136 organohydrogenpolysiloxane Polymers 0.000 claims abstract description 7
- 239000007787 solid Substances 0.000 claims abstract description 6
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 8
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 8
- 125000003342 alkenyl group Chemical group 0.000 claims description 7
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 5
- 238000002834 transmittance Methods 0.000 claims description 5
- 125000004429 atom Chemical group 0.000 claims description 4
- 229910004283 SiO 4 Inorganic materials 0.000 claims description 3
- 229920001971 elastomer Polymers 0.000 claims description 3
- 125000001183 hydrocarbyl group Chemical group 0.000 claims 1
- 238000004383 yellowing Methods 0.000 abstract description 4
- 239000003795 chemical substances by application Substances 0.000 description 14
- 238000001723 curing Methods 0.000 description 14
- 150000002430 hydrocarbons Chemical group 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 239000000463 material Substances 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 238000002156 mixing Methods 0.000 description 7
- 239000003054 catalyst Substances 0.000 description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical group [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 6
- 229920002554 vinyl polymer Polymers 0.000 description 6
- -1 3,3,3-trifluoropropyl group Chemical group 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000005227 gel permeation chromatography Methods 0.000 description 4
- 229910052909 inorganic silicate Inorganic materials 0.000 description 4
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- NFHFRUOZVGFOOS-UHFFFAOYSA-N palladium;triphenylphosphane Chemical compound [Pd].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.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 NFHFRUOZVGFOOS-UHFFFAOYSA-N 0.000 description 3
- 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 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
- 239000004793 Polystyrene Substances 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 description 2
- 238000004040 coloring Methods 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- 238000004382 potting Methods 0.000 description 2
- 239000000843 powder Substances 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
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 239000000377 silicon 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
- KJDMMCYMVUTZSN-UHFFFAOYSA-N (1-ethynylcyclohexyl)oxy-trimethylsilane Chemical compound C[Si](C)(C)OC1(C#C)CCCCC1 KJDMMCYMVUTZSN-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
- 125000001731 2-cyanoethyl group Chemical group [H]C([H])(*)C([H])([H])C#N 0.000 description 1
- CEBKHWWANWSNTI-UHFFFAOYSA-N 2-methylbut-3-yn-2-ol Chemical compound CC(C)(O)C#C CEBKHWWANWSNTI-UHFFFAOYSA-N 0.000 description 1
- NECRQCBKTGZNMH-UHFFFAOYSA-N 3,5-dimethylhex-1-yn-3-ol Chemical compound CC(C)CC(C)(O)C#C NECRQCBKTGZNMH-UHFFFAOYSA-N 0.000 description 1
- ZCTILCZSUSTVHT-UHFFFAOYSA-N 3,5-dimethylhex-1-yn-3-yloxy(trimethyl)silane Chemical compound CC(C)CC(C)(C#C)O[Si](C)(C)C ZCTILCZSUSTVHT-UHFFFAOYSA-N 0.000 description 1
- YLZOPXRUQYQQID-UHFFFAOYSA-N 3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]propan-1-one Chemical compound N1N=NC=2CN(CCC=21)CCC(=O)N1CCN(CC1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F YLZOPXRUQYQQID-UHFFFAOYSA-N 0.000 description 1
- QYXVDGZUXHFXTO-UHFFFAOYSA-L 3-oxobutanoate;platinum(2+) Chemical compound [Pt+2].CC(=O)CC([O-])=O.CC(=O)CC([O-])=O QYXVDGZUXHFXTO-UHFFFAOYSA-L 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000007259 addition reaction Methods 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 125000003710 aryl alkyl group Chemical group 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- NFCHUEIPYPEHNE-UHFFFAOYSA-N bis(2,2-dimethylbut-3-ynoxy)-dimethylsilane Chemical compound C#CC(C)(C)CO[Si](C)(C)OCC(C)(C)C#C NFCHUEIPYPEHNE-UHFFFAOYSA-N 0.000 description 1
- YNHIGQDRGKUECZ-UHFFFAOYSA-L bis(triphenylphosphine)palladium(ii) dichloride Chemical compound [Cl-].[Cl-].[Pd+2].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 YNHIGQDRGKUECZ-UHFFFAOYSA-L 0.000 description 1
- 229910052794 bromium Inorganic materials 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 229910000420 cerium oxide Inorganic materials 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 229910002026 crystalline silica Inorganic materials 0.000 description 1
- 125000004093 cyano group Chemical group *C#N 0.000 description 1
- 125000006165 cyclic alkyl group Chemical group 0.000 description 1
- 125000004122 cyclic group Chemical group 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
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- BITPLIXHRASDQB-UHFFFAOYSA-N ethenyl-[ethenyl(dimethyl)silyl]oxy-dimethylsilane Chemical compound C=C[Si](C)(C)O[Si](C)(C)C=C BITPLIXHRASDQB-UHFFFAOYSA-N 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 229910021485 fumed silica Inorganic materials 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 125000005843 halogen group Chemical group 0.000 description 1
- 238000013007 heat curing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- QXLPXWSKPNOQLE-UHFFFAOYSA-N methylpentynol Chemical compound CCC(C)(O)C#C QXLPXWSKPNOQLE-UHFFFAOYSA-N 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000001280 n-hexyl group Chemical group C(CCCCC)* 0.000 description 1
- 125000004123 n-propyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 1
- 229910052763 palladium Inorganic materials 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
- 230000000704 physical effect Effects 0.000 description 1
- 229920001843 polymethylhydrosiloxane Polymers 0.000 description 1
- 238000011417 postcuring Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 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 1
- 238000003860 storage Methods 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
- 230000008719 thickening Effects 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 125000003944 tolyl group Chemical group 0.000 description 1
- JNRUXZIXAXHXTN-UHFFFAOYSA-N trimethyl(2-methylbut-3-yn-2-yloxy)silane Chemical compound C#CC(C)(C)O[Si](C)(C)C JNRUXZIXAXHXTN-UHFFFAOYSA-N 0.000 description 1
- NWMVPLQDJXJDEW-UHFFFAOYSA-N trimethyl(3-methylpent-1-yn-3-yloxy)silane Chemical compound CCC(C)(C#C)O[Si](C)(C)C NWMVPLQDJXJDEW-UHFFFAOYSA-N 0.000 description 1
- 125000005387 trisiloxy group Chemical group 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
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- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
本発明は、室温で硬化し、高透明および高強度な硬化物を与える付加硬化型シリコーンゴム組成物に関する。 TECHNICAL FIELD The present invention relates to an addition-curable silicone rubber composition that cures at room temperature to give a cured product with high transparency and high strength.
高透明なシリコーンゴム材料は、光デバイス材料、3Dプリンター用材料、ナノインプリント材料等、多岐にわたる材料に使用されている。
また、シリコーン材料は、耐久性に優れることから、ドライフラワーや立体模型などをシリコーンゲルやシリコーンゴム内に封入した観賞用の成型物が提案されている(特許文献1,2)。このようなポッティングに用いられるシリコーンゴムは、硬化前は液状であり、硬化剤と混合することにより、常温または加熱下で簡単に硬化し、高透明なゴム材料となる。
Highly transparent silicone rubber materials are used in a wide variety of materials such as optical device materials, 3D printer materials, and nanoimprint materials.
In addition, since silicone materials are excellent in durability, ornamental moldings in which dried flowers, three-dimensional models, and the like are encapsulated in silicone gel or silicone rubber have been proposed (Patent Documents 1 and 2). The silicone rubber used for such potting is liquid before curing, and when mixed with a curing agent, it cures easily at room temperature or under heating to form a highly transparent rubber material.
しかし、シリコーンゴム材料は、硬化剤との混合時やポッティング時に発生した巻きこみ泡が硬化後に残ったり、硬化後の収縮によりシリコーンゴムと容器または封入物との界面に剥離が生じたり、長期間経過後に金属触媒に起因する着色により材料が黄変したりする等の問題がある。
これらの問題に対し、黄変や泡の巻きこみが低減され、硬さ変化の小さい硬化物を与える室温硬化型シリコーンゴム組成物が提案されている(特許文献3)が、硬化物が脆いため枠から脱型する際にひび割れが生じ易いという問題がある。
However, with silicone rubber materials, entrapment bubbles generated during mixing with the curing agent or potting may remain after curing, and shrinkage after curing may cause peeling at the interface between the silicone rubber and the container or enclosure. There are problems such as yellowing of the material later due to coloring caused by the metal catalyst.
To address these problems, a room-temperature-curable silicone rubber composition that reduces yellowing and entrainment of bubbles and gives a cured product with little change in hardness has been proposed (Patent Document 3). There is a problem that cracks are likely to occur when the mold is removed from the mold.
本発明は、上記事情に鑑みなされたもので、黄変や泡の巻きこみが大きく低減され、高透明、かつ高強度な硬化物を与える室温硬化型シリコーンゴム組成物を提供することを目的とする。 SUMMARY OF THE INVENTION It is an object of the present invention to provide a room temperature vulcanizable silicone rubber composition which is greatly reduced in yellowing and entrainment of bubbles and which gives a cured product of high transparency and high strength. .
本発明者らは、上記目的を達成するため鋭意検討を行った結果、下記の特定の付加硬化型シリコーンゴム組成物が、混合時における泡の巻きこみの発生を低減し、高透明かつ高強度なシリコーンゴムを与えることを見出し、本発明を完成させた。 The present inventors have made intensive studies in order to achieve the above object, and as a result, the following specific addition-curable silicone rubber composition reduces the entrainment of bubbles during mixing and exhibits high transparency and high strength. The present invention was completed by discovering that a silicone rubber can be obtained.
すなわち、本発明は、
1. (A)下記平均式(1)で表されるオルガノポリシロキサン、
[Vi(3-a)R1
aSiO1/2]2[R1
2SiO2/2]m (1)
(式中、R1は、それぞれ独立して、アルケニル基を含まない非置換または置換の1価炭化水素基を表し、Viは、ビニル基を表し、mは、13~400の数を表し、aは、0~2の数を表す。)
(B)構成単位比が下記式(2)で表され、23℃で固体のオルガノポリシロキサン、
[R1
3SiO1/2]p[Vi(3-b)R1
bSiO1/2]q[SiO4/2]r (2)
(式中、R1およびViは、前記と同じ意味を表し、p、qおよびrは、それぞれp>0、q>0、r>0、かつ、p+q+r=1を満たす数を表し、bは、0~2の数を表す。)
(C)構成単位比が下記式(3)で表され、23℃で液体のオルガノポリシロキサン、
[Vi(3-c)R1
cSiO1/2]s[R1
3SiO3/2]t (3)
(式中、R1およびViは、前記と同じ意味を表し、sおよびtは、それぞれs>0、t>0、かつ、s+t=1を満たす数を表し、cは、0~2の数を表す。)
(D)下記平均式(4)で表されるオルガノハイドロジェンポリシロキサン、
[R2R1
2SiO1/2]2[HR1SiO2/2]u[R1
2SiO2/2]v (4)
(式中、R1は、前記と同じ意味を表し、R2は、水素原子またはメチル基を表し、uおよびvは、それぞれu≧2、v≧2、かつ、10≦u+v≦100を満たす数を表す。)
および
(E)ヒドロシリル化反応触媒
を含有し、
(A)、(B)および(C)成分中のビニル基の合計個数に対する(D)成分中のSiH基の個数が0.7~3.0倍であり、かつ(E)成分のヒドロシリル化反応触媒に由来する金属原子の含有量が、(A)~(D)成分の合計量に対して20質量ppm以下である室温硬化型シリコーンゴム組成物、
2. 前記式(1)におけるR1のうち1~10モル%がフェニル基である1の室温硬化型シリコーンゴム組成物、
3. 前記式(4)におけるR2が、水素原子であり、u、vが、それぞれu≧2、v≧2、10≦u+v≦50、かつ、0.05≦u/(u+v)≦0.5を満たす数である1または2の室温硬化型シリコーンゴム組成物、
4. (A)、(B)および(C)成分中のビニル基の合計個数に対する(D)成分中のSiH基の個数が、1.0~2.5倍である1~3のいずれかの室温硬化型シリコーンゴム組成物、
5. 23℃における粘度が1,000mPa・s以下である1~4のいずれかの室温硬化型シリコーンゴム組成物、
6. 1~5のいずれかの室温硬化型シリコーンゴム組成物を硬化させてなるシリコーンゴム、
7. 23℃、24時間の条件で硬化させた硬化物のデュロメータA硬度と、23℃、72時間の条件で硬化させた硬化物のデュロメータA硬度との差が1以下である6のシリコーンゴム、
8. 厚さ2mmにおける波長400nm光の透過率が、90%以上である6または7のシリコーンゴム
を提供する。
That is, the present invention
1. (A) an organopolysiloxane represented by the following average formula (1);
[Vi (3-a) R1aSiO1 / 2 ] 2 [ R12SiO2 / 2 ] m (1)
(wherein each R 1 independently represents an unsubstituted or substituted monovalent hydrocarbon group containing no alkenyl group, Vi represents a vinyl group, m represents a number of 13 to 400, a represents a number from 0 to 2.)
(B) an organopolysiloxane whose constitutional unit ratio is represented by the following formula (2) and is solid at 23°C;
[ R 13 SiO 1/2 ] p [Vi (3-b) R 1 b SiO 1/2 ] q [ SiO 4/2 ] r ( 2)
(Wherein, R 1 and Vi have the same meanings as above, p, q and r represent numbers satisfying p>0, q>0, r>0 and p+q+r=1, respectively, and b , represents a number from 0 to 2.)
(C) an organopolysiloxane whose constitutional unit ratio is represented by the following formula (3) and is liquid at 23°C;
[Vi (3-c) R1cSiO1 /2 ] s [ R13SiO3 / 2 ] t (3)
(Wherein, R 1 and Vi have the same meaning as above, s and t represent numbers satisfying s>0, t>0 and s+t=1, respectively, and c is a number from 0 to 2. represents.)
(D) an organohydrogenpolysiloxane represented by the following average formula (4);
[ R2R12SiO1 /2 ] 2 [ HR1SiO2 /2 ] u [ R12SiO2 / 2 ] v (4 )
(In the formula, R 1 has the same meaning as above, R 2 represents a hydrogen atom or a methyl group, u and v satisfy u≧2, v≧2, and 10≦u+v≦100, respectively. represents a number.)
and (E) a hydrosilylation reaction catalyst,
The number of SiH groups in component (D) is 0.7 to 3.0 times the total number of vinyl groups in components (A), (B) and (C), and hydrosilylation of component (E) A room-temperature-curable silicone rubber composition in which the content of metal atoms derived from the reaction catalyst is 20 mass ppm or less with respect to the total amount of components (A) to (D);
2. The room-temperature-curable silicone rubber composition of 1, wherein 1 to 10 mol% of R 1 in the formula (1) is a phenyl group;
3. R 2 in the formula (4) is a hydrogen atom, u and v are u≧2, v≧2, 10≦u+v≦50, and 0.05≦u/(u+v)≦0.5 1 or 2 room temperature curable silicone rubber compositions that satisfy
4. Any room temperature of 1 to 3, wherein the number of SiH groups in component (D) is 1.0 to 2.5 times the total number of vinyl groups in components (A), (B) and (C) a curable silicone rubber composition,
5. The room temperature curable silicone rubber composition according to any one of 1 to 4, which has a viscosity of 1,000 mPa·s or less at 23°C;
6. A silicone rubber obtained by curing the room temperature curable silicone rubber composition of any one of 1 to 5;
7. The silicone rubber of 6, wherein the difference between the durometer A hardness of the cured product cured at 23° C. for 24 hours and the durometer A hardness of the cured product cured at 23° C. for 72 hours is 1 or less;
8. Provide 6 or 7 silicone rubber having a transmittance of 90% or more for light having a wavelength of 400 nm at a thickness of 2 mm.
本発明の室温硬化型シリコーンゴム組成物は、泡抜け性に優れ、高透明、高強度かつ硬さ変化の小さいシリコーンゴムを与えるため、ハーバリウム等の標本、立体模型、装飾品等の封止用途に好適である。 Since the room-temperature-curable silicone rubber composition of the present invention provides a silicone rubber with excellent bubble-removing properties, high transparency, high strength, and little change in hardness, it can be used to seal specimens such as herbariums, three-dimensional models, ornaments, and the like. Suitable for use.
以下、本発明について具体的に説明する。
本発明の室温硬化型シリコーンゴム組成物は、下記(A)~(E)成分を含有する。
(A)分子鎖両末端ビニル基含有直鎖状オルガノポリシロキサン
(B)23℃において固体のビニル基含有分岐状オルガノポリシロキサン
(C)23℃において液体のビニル基含有分岐状オルガノポリシロキサン
(D)直鎖状オルガノハイドロジェンポリシロキサン
(E)ヒドロシリル化反応触媒
The present invention will be specifically described below.
The room-temperature-curable silicone rubber composition of the present invention contains the following components (A) to (E).
(A) Linear organopolysiloxane containing vinyl groups at both ends of the molecular chain (B) Branched organopolysiloxane containing vinyl groups which is solid at 23°C (C) Branched organopolysiloxane containing vinyl groups which is liquid at 23°C (D) ) Linear organohydrogenpolysiloxane (E) Hydrosilylation reaction catalyst
[1](A)成分
(A)成分は、下記平均式(1)で表される、分子鎖両末端にビニル基を有する直鎖状オルガノポリシロキサンである。
[Vi(3-a)R1
aSiO1/2]2[R1
2SiO2/2]m (1)
[1] Component (A) Component (A) is a linear organopolysiloxane having vinyl groups at both ends of the molecular chain represented by the following average formula (1).
[Vi (3-a) R1aSiO1 / 2 ] 2 [ R12SiO2 / 2 ] m (1)
平均式(1)において、R1は、それぞれ独立して、アルケニル基を含まない非置換または置換の1価炭化水素基を表し、Viは、ビニル基を表す(以下同じ)。
R1としては、アルケニル基を有しないものであれば特に限定はなく、直鎖、分岐、環状のいずれでもよいが、炭素原子数1~20の1価炭化水素基が好ましく、炭素原子数1~10の1価炭化水素基がより好ましく、炭素原子数1~5の1価炭化水素基がより一層好ましい。
その具体例としては、メチル、エチル、n-プロピル、イソプロピル、n-ブチル、tert-ブチル、n-ヘキシル基等の直鎖または分岐のアルキル基;シクロヘキシル基等の環状アルキル基;フェニル、トリル基等のアリール基;ベンジル、フェニルエチル基等のアラルキル基などが挙げられる。
また、これらの1価炭化水素基の水素原子の一部または全部が、F、Cl、Br等のハロゲン原子、シアノ基等で置換されていてもよく、そのような基の具体例としては、3,3,3-トリフルオロプロピル基等のハロゲン置換炭化水素基;2-シアノエチル基等のシアノ置換炭化水素基等が挙げられる。
これらの中でもメチル基、フェニル基が好ましく、R1のうち1~10モル%がフェニル基であることがより好ましい。
In the average formula (1), each R 1 independently represents an unsubstituted or substituted monovalent hydrocarbon group containing no alkenyl group, and Vi represents a vinyl group (the same shall apply hereinafter).
R 1 is not particularly limited as long as it does not have an alkenyl group, and may be linear, branched or cyclic. A monovalent hydrocarbon group of 1 to 10 is more preferred, and a monovalent hydrocarbon group of 1 to 5 carbon atoms is even more preferred.
Specific examples thereof include linear or branched alkyl groups such as methyl, ethyl, n-propyl, isopropyl, n-butyl, tert-butyl and n-hexyl groups; cyclic alkyl groups such as cyclohexyl groups; phenyl and tolyl groups. aryl groups such as benzyl; and aralkyl groups such as benzyl and phenylethyl groups.
In addition, some or all of the hydrogen atoms of these monovalent hydrocarbon groups may be substituted with halogen atoms such as F, Cl, and Br, cyano groups, and the like. Specific examples of such groups include Halogen-substituted hydrocarbon groups such as 3,3,3-trifluoropropyl group; cyano-substituted hydrocarbon groups such as 2-cyanoethyl group;
Among these, a methyl group and a phenyl group are preferred, and 1 to 10 mol % of R 1 is more preferably a phenyl group.
また、平均式(1)において、aは、0~2の数である。
mは、13~400の数であり、好ましくは30~350の数であり、より好ましくは100~300の数である。mが13より小さいと硬化時に揮発してしまい、400より大きいと組成物の混合時の泡抜けが悪くなり、また、作業性が悪化する。
Also, in the average formula (1), a is a number from 0 to 2.
m is a number from 13 to 400, preferably a number from 30 to 350, more preferably a number from 100 to 300. When m is less than 13, volatilization occurs during curing, and when it is greater than 400, foam removal during mixing of the composition becomes poor and workability deteriorates.
(A)成分は、組成物を混合する際に生じる泡が抜けやすい点、および液状の組成物を与え、硬化してゴム状弾性体になるという点から、23℃での粘度が10~2,000mPa・sが好ましく、20~1,500mPa・sがより好ましい。なお、本発明における粘度は、回転粘度計を用いた測定値である。 Component (A) has a viscosity at 23° C. of 10 to 2, because the bubbles generated when mixing the composition are easily removed, and because it gives a liquid composition that hardens into a rubber-like elastic body. ,000 mPa·s, and more preferably 20 to 1,500 mPa·s. In addition, the viscosity in the present invention is a measured value using a rotational viscometer.
このような(A)成分としては、例えば、下記平均式で示されるオルガノポリシロキサン等が挙げられる。(A)成分は、1種単独で用いても2種以上を併用してもよい。 Examples of such component (A) include organopolysiloxanes represented by the following average formula. (A) component may be used individually by 1 type, or may use 2 or more types together.
[2](B)成分
(B)成分は、下記式(2)で表される構成単位比を有し、23℃において固体のビニル基含有分岐状オルガノポリシロキサンであり、ヒドロシリル化に伴う架橋により組成物に補強効果をもたらす成分である。
[R1
3SiO1/2]p[Vi(3-b)R1
bSiO1/2]q[SiO4/2]r (2)
[2] Component (B) Component (B) has a structural unit ratio represented by the following formula (2), is a vinyl group-containing branched organopolysiloxane that is solid at 23° C., and is crosslinked by hydrosilylation. is a component that provides a reinforcing effect to the composition.
[R 13 SiO 1/2 ] p [Vi (3-b) R 1 b SiO 1/2 ] q [ SiO 4/2 ] r (2)
式(2)において、R1は上記と同じ意味を表し、具体的には、上記平均式(1)において例示されたアルケニル基以外の非置換または置換の1価炭化水素基と同様のものが挙げられ、中でもメチル基が好ましい。
p、qおよびrは、それぞれp>0、q>0、r>0、かつ、p+q+r=1を満たす数であるが、得られる硬化物の力学特性の点から、(B)成分のオルガノポリシロキサンにおいて、Q単位に対するM単位の比率(p+q)/rは、0.3~2.0が好ましく、0.4~1.0がより好ましい。
bは、0~2の数である。
In formula (2), R 1 has the same meaning as above, and specifically, the same unsubstituted or substituted monovalent hydrocarbon groups other than alkenyl groups exemplified in the above average formula (1) Among them, a methyl group is preferred.
p, q, and r are numbers satisfying p>0, q>0, r>0, and p+q+r=1, respectively. In siloxane, the ratio (p+q)/r of M units to Q units is preferably 0.3 to 2.0, more preferably 0.4 to 1.0.
b is a number from 0 to 2;
(B)成分の分子量は、特に限定されるものではないが、その他の成分に対する相溶性および得られる硬化物の力学特性の点から、1,000~50,000が好ましく、2,000~10,000がより好ましい。なお、分子量はゲル浸透クロマトグラフィー(GPC)における標準ポリスチレン換算の重量平均分子量である。 Although the molecular weight of component (B) is not particularly limited, it is preferably 1,000 to 50,000, more preferably 2,000 to 10, in terms of compatibility with other components and mechanical properties of the resulting cured product. ,000 is more preferred. The molecular weight is the weight average molecular weight in terms of standard polystyrene in gel permeation chromatography (GPC).
(B)成分の具体例としては、下記式で表されるオルガノポリシロキサン等が挙げられる。
(Me3SiO1/2)0.4(ViMe2SiO1/2)0.05(SiO4/2)0.55
(Me3SiO1/2)0.1(Vi3SiO1/2)0.2(SiO4/2)0.7
(Me3SiO1/2)0.35(ViMe2SiO1/2)0.2(Vi3SiO1/2)0.1(SiO4/2)0.35
Specific examples of component (B) include organopolysiloxanes represented by the following formula.
( Me3SiO1 /2 ) 0.4 (ViMe2SiO1 / 2 ) 0.05 (SiO4 /2 ) 0.55
( Me3SiO1 /2 ) 0.1 ( Vi3SiO1 /2 ) 0.2 (SiO4 /2 ) 0.7
( Me3SiO1 /2 ) 0.35 (ViMe2SiO1 / 2 ) 0.2 ( Vi3SiO1 /2 ) 0.1 (SiO4 /2 ) 0.35
(B)成分の配合量は、組成物の粘度および得られる硬化物の力学特性の点から、(A)成分100質量部に対して2~20質量部が好ましく、3~7質量部がより好ましい。 なお、(B)成分は、上記(A)成分に溶解させて用いてもよい。
また、(B)成分は、1種単独で用いても2種以上を併用してもよい。
The amount of component (B) is preferably 2 to 20 parts by mass, more preferably 3 to 7 parts by mass, based on 100 parts by mass of component (A), from the viewpoint of the viscosity of the composition and the mechanical properties of the resulting cured product. preferable. The component (B) may be used by dissolving it in the component (A).
Moreover, (B) component may be used individually by 1 type, or may use 2 or more types together.
[3](C)成分
(C)成分は、下記式(3)で表される構成単位比を有し、23℃において液体のビニル基含有分岐状オルガノポリシロキサンであり、ケイ素原子に結合したビニル基を有するモノシロキシ単位とトリシロキシ単位とからなり、ヒドロシリル化による架橋を促進させる成分である。
[Vi(3-c)R1
cSiO1/2]s[R1
3SiO3/2]t (3)
[3] Component (C) Component (C) has a structural unit ratio represented by the following formula (3), is a vinyl group-containing branched organopolysiloxane that is liquid at 23° C., and is bonded to silicon atoms. It consists of monosiloxy units and trisiloxy units having a vinyl group, and is a component that promotes cross-linking by hydrosilylation.
[Vi (3-c) R1cSiO1 /2 ] s [ R13SiO3 / 2 ] t (3)
式(3)において、R1は上記と同じ意味を表し、具体的には、上記平均式(1)において例示されたアルケニル基以外の非置換または置換の1価炭化水素基と同様のものが挙げられ、中でもメチル基が好ましい。
s、tは、それぞれs>0、t>0、かつ、s+t=1を満たす数であり、cは、0~2の数である。本成分に流動性を持たせ、揮発性を抑える点から、0.4<s<0.7が好ましく、0.45<s<0.6がより好ましい。
In formula (3), R 1 has the same meaning as above, and specifically, the same unsubstituted or substituted monovalent hydrocarbon groups other than alkenyl groups exemplified in the above average formula (1) Among them, a methyl group is preferred.
s and t are numbers that satisfy s>0, t>0 and s+t=1, respectively, and c is a number from 0 to 2. 0.4<s<0.7 is preferable, and 0.45<s<0.6 is more preferable from the viewpoint of imparting fluidity to this component and suppressing volatility.
(C)成分の動粘度は、特に限定されるものではないが、その他の成分に対する相溶性および得られる硬化物の力学特性の点から、1~500mm2/sであることが好ましく、10~100mm2/sであることがより好ましい。なお、動粘度はキャノン・フェンスケ粘度計により測定した23℃における値である。 Although the kinematic viscosity of component (C) is not particularly limited, it is preferably 1 to 500 mm 2 /s from the viewpoint of compatibility with other components and mechanical properties of the resulting cured product, and More preferably, it is 100 mm 2 /s. The kinematic viscosity is a value at 23°C measured with a Canon Fenske viscometer.
(C)成分の具体例としては、下記式で表される構成単位比を有するオルガノポリシロキサン等が挙げられる。
(ViMe2SiO1/2)0.5(R1
3SiO3/2)0.5
(ViMe2SiO1/2)0.55(R1
3SiO3/2)0.45
(ViMe2SiO1/2)0.6(R1
3SiO3/2)0.4
Specific examples of component (C) include organopolysiloxanes having a structural unit ratio represented by the following formula.
(ViMe2SiO1 /2 ) 0.5 ( R13SiO3 / 2 ) 0.5
(ViMe2SiO1 /2 ) 0.55 ( R13SiO3 / 2 ) 0.45
(ViMe2SiO1 /2 ) 0.6 ( R13SiO3 / 2 ) 0.4
(C)成分の配合量は、組成物の粘度および得られる硬化物の力学特性の点から、(A)成分100質量部に対して2~20質量部が好ましく、3~10質量部がより好ましい。
なお(C)成分は1種単独で用いても、2種以上を併用してよい。
The amount of component (C) is preferably 2 to 20 parts by mass, more preferably 3 to 10 parts by mass, based on 100 parts by mass of component (A), from the viewpoint of the viscosity of the composition and the mechanical properties of the resulting cured product. preferable.
In addition, (C)component may be used individually by 1 type, or may use 2 or more types together.
[4](D)成分
(D)成分は、下記平均式(4)で表される、ケイ素原子に結合した水素原子(即ち、SiH基)を有する直鎖状オルガノハイドロジェンポリシロキサンであり、(A)~(C)成分中のビニル基と本成分中のSiH基とがヒドロシリル化反応することにより架橋剤として作用する。
[R2R1
2SiO1/2]2[HR1SiO2/2]u[R1
2SiO2/2]v (4)
[4] Component (D) Component (D) is a linear organohydrogenpolysiloxane having silicon-bonded hydrogen atoms (i.e., SiH groups) represented by the following average formula (4), The vinyl groups in components (A) to (C) and the SiH groups in this component act as a cross-linking agent through a hydrosilylation reaction.
[ R2R12SiO1 /2 ] 2 [ HR1SiO2 /2 ] u [ R12SiO2 / 2 ] v (4)
平均式(4)において、R1は上記と同じ意味を表し、具体的には、上記平均式(1)において例示されたアルケニル基以外の非置換または置換の1価炭化水素基と同様のものが挙げられ、中でもメチル基が好ましい。
R2は、水素原子またはメチル基であり、中でも水素原子が好ましい。
In the average formula (4), R 1 has the same meaning as above, and specifically, it is the same as the unsubstituted or substituted monovalent hydrocarbon group other than the alkenyl group exemplified in the average formula (1). Among them, a methyl group is preferred.
R 2 is a hydrogen atom or a methyl group, preferably a hydrogen atom.
u、vは、それぞれu≧2、v≧2、かつ、10≦u+v≦100を満たす数である。
uは、u≧5が好ましく、u≧10がより好ましく、vは、v≦70が好ましく、よりv≦50がより好ましい。また、0.05≦u/(u+v)≦0.5を満たす数が好ましい。
u+vが10未満であると、硬化時に揮発してしまい、100を超えると、組成物の粘度が高くなることにより泡が抜けにくくなり、また、作業性が悪化する。
u and v are numbers that satisfy u≧2, v≧2, and 10≦u+v≦100, respectively.
u is preferably u≧5, more preferably u≧10, and v is preferably v≦70, more preferably v≦50. Also, a number that satisfies 0.05≦u/(u+v)≦0.5 is preferable.
When u+v is less than 10, volatilization occurs during curing, and when it exceeds 100, the viscosity of the composition increases, making it difficult for bubbles to escape and workability deteriorates.
(D)成分のオルガノハイドロジェンポリシロキサンの具体例としては、下記平均式で表される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メチルハイドロジェンポリシロキサン等が挙げられる。
なお、(D)成分は、1種単独で用いても、2種以上を併用してもよい。
Specific examples of the component (D) organohydrogenpolysiloxane include dimethylsiloxane-methylhydrogensiloxane copolymer with trimethylsiloxy group-blocked at both molecular chain ends and trimethylsiloxy-group-blocked at both molecular chain ends represented by the following average formula: Examples include methylhydrogenpolysiloxane and the like.
In addition, (D) component may be used individually by 1 type, or may use 2 or more types together.
(D)成分の配合量は、(A)、(B)および(C)成分中のビニル基の合計個数に対する(D)成分中のSiH基の個数が0.7~3.0倍となる量であり、好ましくは1.0~2.5倍となる量である。SiH基の個数が0.7倍未満の場合は、架橋が不十分なものとなり、3.0倍を超える場合、硬化の際に水素ガスの発生による発泡が起こりやすく、硬化物内部の空隙の発生により透明性やゴム強度が低下する。 The amount of component (D) is such that the number of SiH groups in component (D) is 0.7 to 3.0 times the total number of vinyl groups in components (A), (B) and (C). amount, preferably 1.0 to 2.5 times. If the number of SiH groups is less than 0.7 times, the cross-linking will be insufficient, and if it exceeds 3.0 times, foaming due to the generation of hydrogen gas is likely to occur during curing, and voids inside the cured product will be formed. Occurrence of this reduces transparency and rubber strength.
[5](E)成分
(E)成分は、(A)~(C)成分中のビニル基と(D)成分中のSiH基とのヒドロシリル化反応を促進するためのヒドロシリル化反応触媒である。
(E)成分のヒドロシリル化反応触媒としては、白金族金属触媒が好ましく、その具体例としては、白金黒、塩化第2白金、塩化白金酸、塩化白金酸と1価アルコールとの反応物、塩化白金酸とオレフィン類との錯体、白金ビスアセトアセテートなどの白金系触媒、テトラキス(トリフェニルホスフィン)パラジウム、ジクロロビス(トリフェニルホスフィン)パラジウム等のパラジウム系触媒、クロロトリス(トリフェニルホスフィン)ロジウム、テトラキス(トリフェニルホスフィン)ロジウム等のロジウム系触媒などが挙げられる。
[5] Component (E) Component (E) is a hydrosilylation reaction catalyst for promoting the hydrosilylation reaction between vinyl groups in components (A) to (C) and SiH groups in component (D). .
As the hydrosilylation reaction catalyst of the component (E), a platinum group metal catalyst is preferable. Complexes of platinic acid and olefins, platinum-based catalysts such as platinum bisacetoacetate, palladium-based catalysts such as tetrakis(triphenylphosphine)palladium, dichlorobis(triphenylphosphine)palladium, chlorotris(triphenylphosphine)rhodium, tetrakis( triphenylphosphine) and rhodium-based catalysts such as rhodium.
(E)成分の配合量は、(A)~(D)成分の合計に対して、本成分中の白金族金属原子の質量換算で20ppm以下であり、15ppm以下が好ましい。また、その下限は、1ppm以上が好ましく、3ppm以上がより好ましい。この範囲であれば、付加反応の反応速度が適切なものとなり、触媒由来の金属原子による硬化物の着色を抑制できる。 The amount of component (E) to be blended is 20 ppm or less, preferably 15 ppm or less, in terms of mass of platinum group metal atoms in this component with respect to the total of components (A) to (D). Moreover, the lower limit thereof is preferably 1 ppm or more, more preferably 3 ppm or more. Within this range, the reaction rate of the addition reaction is appropriate, and coloring of the cured product due to metal atoms derived from the catalyst can be suppressed.
[6](F)成分
本発明の室温硬化型シリコーンゴム組成物には、組成物を調製する際や加熱硬化前に増粘やゲル化を起こさないようにヒドロシリル化反応触媒の反応性を制御する目的で、必要に応じて(F)反応制御剤を添加してもよい。
[6] Component (F) In the room-temperature-curable silicone rubber composition of the present invention, the reactivity of the hydrosilylation reaction catalyst is controlled so as not to cause thickening or gelation during preparation of the composition or before heat curing. For this purpose, (F) a reaction control agent may be added as necessary.
反応制御剤の具体例としては、3-メチル-1-ブチン-3-オール、3-メチル-1-ペンチン-3-オール、3,5-ジメチル-1-ヘキシン-3-オール、1-エチニルシクロヘキサノール、エチニルメチルデシルカルビノール、3-メチル-3-トリメチルシロキシ-1-ブチン、3-メチル-3-トリメチルシロキシ-1-ペンチン、3,5-ジメチル-3-トリメチルシロキシ-1-ヘキシン、1-エチニル-1-トリメチルシロキシシクロヘキサン、ビス(2,2-ジメチル-3-ブチノキシ)ジメチルシラン、1,3,5-トリメチル-1,3,5-トリビニルシクロテトラシロキサン、1,3,5,7-テトラメチル-1,3,5,7-テトラビニルシクロテトラシロキサン、1,1,3,3-テトラメチル-1,3-ジビニルジシロキサン等が挙げられ、これらは1種単独で用いても、2種以上を組み合わせて用いてもよい。
これらの中でも、1,3,5,7-テトラメチル-1,3,5,7-テトラビニルシクロテトラシロキサンが好ましい。
Specific examples of reaction control agents include 3-methyl-1-butyn-3-ol, 3-methyl-1-pentyn-3-ol, 3,5-dimethyl-1-hexyn-3-ol, 1-ethynyl cyclohexanol, ethynylmethyldecylcarbinol, 3-methyl-3-trimethylsiloxy-1-butyne, 3-methyl-3-trimethylsiloxy-1-pentyne, 3,5-dimethyl-3-trimethylsiloxy-1-hexyne, 1-ethynyl-1-trimethylsiloxycyclohexane, bis(2,2-dimethyl-3-butynoxy)dimethylsilane, 1,3,5-trimethyl-1,3,5-trivinylcyclotetrasiloxane, 1,3,5 ,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane, 1,1,3,3-tetramethyl-1,3-divinyldisiloxane and the like, and these are used alone. or two or more of them may be used in combination.
Among these, 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane is preferred.
(F)成分を用いる場合、その添加量は、(A)~(D)成分の合計100質量部に対して0.001~2質量部が好ましく、0.006~1.5質量部がより好ましい。このような範囲であれば反応制御の効果が十分発揮される。 When component (F) is used, the amount added is preferably 0.001 to 2 parts by mass, more preferably 0.006 to 1.5 parts by mass, with respect to the total 100 parts by mass of components (A) to (D). preferable. Within such a range, the effect of reaction control is sufficiently exhibited.
[7]その他の成分
本発明の室温硬化型シリコーンゴム組成物には、上記(A)~(F)成分以外にも、本発明の目的を損なわない限り、以下に例示するその他の成分を配合してもよい。
その他の成分としては、ヒュームドシリカ、結晶性シリカ(石英粉)、沈降性シリカ、これらの表面を疎水化処理したシリカ等の充填剤、酸化鉄、カーボンブラック、導電性亜鉛華、金属粉等の導電剤;酸化チタン、酸化セリウム等の耐熱剤;ジメチルシリコーンオイル等の内部離型剤;接着性付与剤;チクソ性付与剤;着色剤等が挙げられる。
[7] Other Components In addition to the above components (A) to (F), the room-temperature-curable silicone rubber composition of the present invention may contain other components exemplified below as long as they do not impair the purpose of the present invention. You may
Other ingredients include fumed silica, crystalline silica (quartz powder), precipitated silica, fillers such as silica whose surface is hydrophobically treated, iron oxide, carbon black, conductive zinc oxide, metal powder, etc. heat-resistant agents such as titanium oxide and cerium oxide; internal release agents such as dimethylsilicone oil; adhesiveness-imparting agents; thixotropy-imparting agents;
本発明の室温硬化型シリコーンゴム組成物は、上記の(A)~(E)成分、必要に応じて用いられる(F)成分、およびその他の成分をニーダー、プラネタリーミキサー等を用いた公知の方法で混合して調製することができる。
本発明の室温硬化型シリコーンゴム組成物は、(A)成分、(E)成分、および必要に応じてその他の成分からなる第一剤と、(A)~(D)成分、(F)成分、および必要に応じてその他の成分からなる第二剤を別々に調製し、使用前に第一剤と第二剤を混合する二剤型の組成物としてもよい。なお、第一剤および第二剤で共通に使用される成分があってもよい。組成物をこのような二剤型とすることによりさらに保存安定性が確保できる。
The room-temperature-curable silicone rubber composition of the present invention can be prepared by kneading the above components (A) to (E), the optional component (F), and other components using a kneader, planetary mixer, or the like. It can be prepared by mixing in a method.
The room-temperature-curable silicone rubber composition of the present invention comprises a first agent comprising component (A), component (E), and optionally other components, components (A) to (D), and component (F). , and, if necessary, a second agent consisting of other ingredients may be prepared separately, and a two-part composition may be prepared by mixing the first agent and the second agent before use. In addition, there may be a component commonly used in the first agent and the second agent. Storage stability can be further ensured by making the composition into such a two-pack type.
本発明の室温硬化型シリコーンゴム組成物の硬化は、公知の硬化方法および条件を採用することができる。一例としては10~40℃において24時間以上静置することにより硬化させることができる。 Curing of the room-temperature-curable silicone rubber composition of the present invention can employ known curing methods and conditions. For example, it can be cured by standing at 10 to 40° C. for 24 hours or longer.
本発明の室温硬化型シリコーンゴム組成物を23℃、24時間の条件で硬化させた硬化物のデュロメータA硬度と、23℃、72時間の条件で硬化させた硬化物のデュロメータA硬度との差が1以下であることが好ましい。
また、本発明の室温硬化型シリコーンゴム組成物を23℃、24時間の条件で硬化させた硬化物は、厚さ2mmにおける波長400nm光の透過率が90%以上であることが好ましい。
The difference between the durometer A hardness of the cured product obtained by curing the room temperature curable silicone rubber composition of the present invention at 23°C for 24 hours and the durometer A hardness of the cured product obtained by curing at 23°C for 72 hours. is preferably 1 or less.
A cured product obtained by curing the room-temperature-curable silicone rubber composition of the present invention at 23° C. for 24 hours preferably has a transmittance of 90% or more for light having a wavelength of 400 nm at a thickness of 2 mm.
以下、実施例および比較例を挙げて本発明をより具体的に説明するが、本発明はこれらの実施例に限定されるものではない。 EXAMPLES The present invention will be described in more detail below with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples.
[実施例1-1~1-4、比較例1-1~1-4]
下記成分を表1に示される配合比(質量部)で混合し、シリコーンゴム組成物を調製した。なお、平均分子量はゲル浸透クロマトグラフィー(GPC)における標準ポリスチレン換算の重量平均分子量であり、粘度はB型回転粘度計で測定した23℃における値であり、動粘度はキャノン・フェンスケ粘度計で測定した23℃における値である。
[Examples 1-1 to 1-4, Comparative Examples 1-1 to 1-4]
A silicone rubber composition was prepared by mixing the following components at the compounding ratio (parts by mass) shown in Table 1. The average molecular weight is the weight average molecular weight in terms of standard polystyrene in gel permeation chromatography (GPC), the viscosity is the value at 23 ° C. measured with a B-type rotational viscometer, and the kinematic viscosity is measured with a Canon Fenske viscometer. It is a value at 23 ° C.
(A)成分:
(A-1)下記平均式で表されるオルガノポリシロキサン(粘度:1,000mPa・s、ビニル価:0.013モル/100g)
(A-1) Organopolysiloxane represented by the following average formula (viscosity: 1,000 mPa·s, vinyl value: 0.013 mol/100 g)
(A-2)下記平均式で表されるオルガノポリシロキサン(粘度:1,500mPa・s、ビニル価:0.02モル/100g)
(A-3)下記平均式で表されるオルガノポリシロキサン(粘度:1,000mPa・s、ビニル価:0.013モル/100g)
(A-4:比較成分)下記平均式で表されるオルガノポリシロキサン(粘度:5,000mPa・s、ビニル価:0.006モル/100g)
(B)成分:
(B-1)下記式で表される構成単位比を有し、23℃において固体のオルガノポリシロキサン(平均分子量:4,000、ビニル価:0.08モル/100g)
(Me3SiO1/2)0.4(ViMe2SiO1/2)0.05(SiO4/2)0.55
(B) Component:
(B-1) Organopolysiloxane having a structural unit ratio represented by the following formula and solid at 23° C. (average molecular weight: 4,000, vinyl value: 0.08 mol/100 g)
( Me3SiO1 /2 ) 0.4 (ViMe2SiO1 / 2 ) 0.05 (SiO4 /2 ) 0.55
(C)成分:
(C-1)下記式で表される構成単位比を有するオルガノポリシロキサン(動粘度32mm2/s、ビニル価:0.52モル/100g)
(ViMe2SiO1/2)0.5(MeSiO3/2)0.5
(C) Component:
(C-1) Organopolysiloxane having a structural unit ratio represented by the following formula (kinematic viscosity: 32 mm 2 /s, vinyl value: 0.52 mol/100 g)
(ViMe2SiO1 / 2 ) 0.5 (MeSiO3 /2 ) 0.5
(D)成分:
(D-1)下記平均式で表されるオルガノハイドロジェンポリシロキサン(SiH基量:0.55モル/100g)
(D-1) Organohydrogenpolysiloxane represented by the following average formula (SiH group content: 0.55 mol/100 g)
(E)成分:
(E-1)塩化白金酸-ジビニルテトラメチルジシロキサン錯体のトルエン溶液(白金濃度1質量%)
(E) Component:
(E-1) Toluene solution of chloroplatinic acid-divinyltetramethyldisiloxane complex (platinum concentration 1% by mass)
[実施例2-1~2-4、比較例2-1~2-4]
実施例1-1~1-4および比較例1-1~1-4で調製したシリコーンゴム組成物を用い、下記の各特性を評価した。それらの結果を表2および表3に示す。
[泡抜け性]
内径40mm高さ60mmのガラス瓶に高さが50mmになるまで混合した直後の組成物を流し込み、23℃、10時間の条件で硬化させた。硬化物を目視で観察し、泡が抜けていれば〇、泡が残っていれば×として評価した。
[光透過率]
組成物を厚さ2mmになるよう型に流し込み、23℃、24時間の条件で硬化させたシートについて、波長400nmの光透過率を分光光度計U-3900((株)日立ハイテクサイエンス製)にて測定した。
[引張強さ、切断時伸び]
組成物を2mm厚になるよう型に流し込み、23℃、24時間の条件で硬化させた2号ダンベル試験片について、JIS K 6249:2003に準拠し、引張強さ(MPa)および切断時伸び(%)をそれぞれ測定した。
[硬さ]
組成物を2mm厚になるよう型に流し込み、23℃、24時間の条件で硬化させた硬化物の硬度(デュロメータA)をJIS K 6253-3:2012に準拠して測定した。また、23℃、72時間の条件で硬化させた硬化物の硬度についても同様に測定を行った。
[Examples 2-1 to 2-4, Comparative Examples 2-1 to 2-4]
Using the silicone rubber compositions prepared in Examples 1-1 to 1-4 and Comparative Examples 1-1 to 1-4, the following properties were evaluated. The results are shown in Tables 2 and 3.
[Debubability]
The composition immediately after being mixed was poured into a glass bottle having an inner diameter of 40 mm and a height of 60 mm to a height of 50 mm, and was cured at 23° C. for 10 hours. The cured product was visually observed, and evaluated as ◯ if bubbles were removed, and as × if bubbles remained.
[Light transmittance]
The composition was poured into a mold to have a thickness of 2 mm, and the sheet was cured under the conditions of 23 ° C. and 24 hours. measured by
[Tensile strength, elongation at break]
The composition was poured into a mold to have a thickness of 2 mm, and the No. 2 dumbbell test piece was cured under the conditions of 23 ° C. and 24 hours, and the tensile strength (MPa) and elongation at break ( %) were measured respectively.
[Hardness]
The composition was poured into a mold so as to have a thickness of 2 mm, and the hardness (durometer A) of the cured product was measured under conditions of 23° C. for 24 hours and measured according to JIS K 6253-3:2012. In addition, the hardness of the cured product cured at 23° C. for 72 hours was also measured in the same manner.
表2および表3に示されるように、実施例1-1~1-4で調製した室温硬化型シリコーンゴム組成物は、泡抜け性や硬化後の物性に優れ、硬さ変化の小さい高透明な硬化物を与えることがわかる。
一方、(A)成分に代えて高粘度(mが400超)のビニル基含有オルガノポリシロキサンを使用した比較例2-1では泡抜け性に劣ることがわかる。
(C)成分を除いた比較例2-2では、泡抜け性および力学特性に劣り、(B)成分を除いた比較例2-3では、光透過性および力学特性に劣ることがわかる。
また、H/Vi値が本発明の範囲を超える比較例2-4の硬化物は、切断時伸びに劣り、硬さ変化が大きいことがわかる。
As shown in Tables 2 and 3, the room-temperature-curable silicone rubber compositions prepared in Examples 1-1 to 1-4 are excellent in bubble release properties and post-curing physical properties, and are highly transparent with little change in hardness. It can be seen that a hardened product is obtained.
On the other hand, in Comparative Example 2-1, in which a vinyl group-containing organopolysiloxane having a high viscosity (m exceeds 400) was used instead of the component (A), it was found to be inferior in defoaming properties.
It can be seen that Comparative Example 2-2 excluding the component (C) is inferior in defoaming properties and mechanical properties, and Comparative Example 2-3 excluding the component (B) is inferior in light transmittance and mechanical properties.
Further, it can be seen that the cured product of Comparative Example 2-4, whose H/Vi value exceeds the range of the present invention, is inferior in elongation at break and has a large change in hardness.
Claims (8)
[Vi(3-a)R1 aSiO1/2]2[R1 2SiO2/2]m (1)
(式中、R1は、それぞれ独立して、アルケニル基を含まない非置換または置換の1価炭化水素基を表し、Viは、ビニル基を表し、mは、13~400の数を表し、aは、0~2の数を表す。)
(B)構成単位比が下記式(2)で表され、23℃で固体のオルガノポリシロキサン、
[R1 3SiO1/2]p[Vi(3-b)R1 bSiO1/2]q[SiO4/2]r (2)
(式中、R1およびViは、前記と同じ意味を表し、p、qおよびrは、それぞれp>0、q>0、r>0、かつ、p+q+r=1を満たす数を表し、bは、0~2の数を表す。)
(C)構成単位比が下記式(3)で表され、23℃で液体のオルガノポリシロキサン、
[Vi(3-c)R1 cSiO1/2]s[R1 3SiO3/2]t (3)
(式中、R1およびViは、前記と同じ意味を表し、sおよびtは、それぞれs>0、t>0、かつ、s+t=1を満たす数を表し、cは、0~2の数を表す。)
(D)下記平均式(4)で表されるオルガノハイドロジェンポリシロキサン、
[R2R1 2SiO1/2]2[HR1SiO2/2]u[R1 2SiO2/2]v (4)
(式中、R1は、前記と同じ意味を表し、R2は、水素原子またはメチル基を表し、uおよびvは、それぞれu≧2、v≧2、かつ、10≦u+v≦100を満たす数を表す。)
および
(E)ヒドロシリル化反応触媒
を含有し、
(A)、(B)および(C)成分中のビニル基の合計個数に対する(D)成分中のSiH基の個数が0.7~3.0倍であり、かつ(E)成分のヒドロシリル化反応触媒に由来する金属原子の含有量が、(A)~(D)成分の合計量に対して20質量ppm以下である室温硬化型シリコーンゴム組成物。 (A) an organopolysiloxane represented by the following average formula (1);
[Vi (3-a) R1aSiO1 / 2 ] 2 [ R12SiO2 / 2 ] m (1)
(wherein each R 1 independently represents an unsubstituted or substituted monovalent hydrocarbon group containing no alkenyl group, Vi represents a vinyl group, m represents a number of 13 to 400, a represents a number from 0 to 2.)
(B) an organopolysiloxane whose constitutional unit ratio is represented by the following formula (2) and is solid at 23°C;
[ R 13 SiO 1/2 ] p [Vi (3-b) R 1 b SiO 1/2 ] q [ SiO 4/2 ] r ( 2)
(Wherein, R 1 and Vi have the same meanings as above, p, q and r represent numbers satisfying p>0, q>0, r>0 and p+q+r=1, respectively, and b , represents a number from 0 to 2.)
(C) an organopolysiloxane whose constitutional unit ratio is represented by the following formula (3) and is liquid at 23°C;
[Vi (3-c) R1cSiO1 /2 ] s [ R13SiO3 / 2 ] t (3)
(Wherein, R 1 and Vi have the same meaning as above, s and t represent numbers satisfying s>0, t>0 and s+t=1, respectively, and c is a number from 0 to 2. represents.)
(D) an organohydrogenpolysiloxane represented by the following average formula (4);
[ R2R12SiO1 /2 ] 2 [ HR1SiO2 /2 ] u [ R12SiO2 / 2 ] v (4 )
(In the formula, R 1 has the same meaning as above, R 2 represents a hydrogen atom or a methyl group, u and v satisfy u≧2, v≧2, and 10≦u+v≦100, respectively. represents a number.)
and (E) a hydrosilylation reaction catalyst,
The number of SiH groups in component (D) is 0.7 to 3.0 times the total number of vinyl groups in components (A), (B) and (C), and hydrosilylation of component (E) A room temperature curable silicone rubber composition in which the content of metal atoms derived from the reaction catalyst is 20 mass ppm or less with respect to the total amount of components (A) to (D).
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