JP2019026681A - ゴム組成物、該ゴム組成物の加硫物及び加硫成形体 - Google Patents
ゴム組成物、該ゴム組成物の加硫物及び加硫成形体 Download PDFInfo
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- JP2019026681A JP2019026681A JP2017144811A JP2017144811A JP2019026681A JP 2019026681 A JP2019026681 A JP 2019026681A JP 2017144811 A JP2017144811 A JP 2017144811A JP 2017144811 A JP2017144811 A JP 2017144811A JP 2019026681 A JP2019026681 A JP 2019026681A
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- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- RSIHJDGMBDPTIM-UHFFFAOYSA-N ethoxy(trimethyl)silane Chemical compound CCO[Si](C)(C)C RSIHJDGMBDPTIM-UHFFFAOYSA-N 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 229910001679 gibbsite Inorganic materials 0.000 description 1
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 description 1
- VLKZOEOYAKHREP-UHFFFAOYSA-N hexane Substances CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 description 1
- 125000004356 hydroxy functional group Chemical group O* 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- 235000021388 linseed oil Nutrition 0.000 description 1
- 239000000944 linseed oil Substances 0.000 description 1
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- 229910052749 magnesium Inorganic materials 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 239000000391 magnesium silicate Substances 0.000 description 1
- 229910052919 magnesium silicate Inorganic materials 0.000 description 1
- 235000019792 magnesium silicate Nutrition 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- POPACFLNWGUDSR-UHFFFAOYSA-N methoxy(trimethyl)silane Chemical compound CO[Si](C)(C)C POPACFLNWGUDSR-UHFFFAOYSA-N 0.000 description 1
- 239000005055 methyl trichlorosilane Substances 0.000 description 1
- JLUFWMXJHAVVNN-UHFFFAOYSA-N methyltrichlorosilane Chemical compound C[Si](Cl)(Cl)Cl JLUFWMXJHAVVNN-UHFFFAOYSA-N 0.000 description 1
- BFXIKLCIZHOAAZ-UHFFFAOYSA-N methyltrimethoxysilane Chemical compound CO[Si](C)(OC)OC BFXIKLCIZHOAAZ-UHFFFAOYSA-N 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 150000004682 monohydrates Chemical class 0.000 description 1
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- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- KVBGVZZKJNLNJU-UHFFFAOYSA-N naphthalene-2-sulfonic acid Chemical compound C1=CC=CC2=CC(S(=O)(=O)O)=CC=C21 KVBGVZZKJNLNJU-UHFFFAOYSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- SLYCYWCVSGPDFR-UHFFFAOYSA-N octadecyltrimethoxysilane Chemical compound CCCCCCCCCCCCCCCCCC[Si](OC)(OC)OC SLYCYWCVSGPDFR-UHFFFAOYSA-N 0.000 description 1
- KCAMXZBMXVIIQN-UHFFFAOYSA-N octan-3-yl 2-methylprop-2-enoate Chemical compound CCCCCC(CC)OC(=O)C(C)=C KCAMXZBMXVIIQN-UHFFFAOYSA-N 0.000 description 1
- KZCOBXFFBQJQHH-UHFFFAOYSA-N octane-1-thiol Chemical compound CCCCCCCCS KZCOBXFFBQJQHH-UHFFFAOYSA-N 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 235000019198 oils Nutrition 0.000 description 1
- 125000002524 organometallic group Chemical group 0.000 description 1
- 229910052762 osmium Inorganic materials 0.000 description 1
- SYQBFIAQOQZEGI-UHFFFAOYSA-N osmium atom Chemical compound [Os] SYQBFIAQOQZEGI-UHFFFAOYSA-N 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 229910052625 palygorskite Inorganic materials 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 229940059574 pentaerithrityl Drugs 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 1
- 235000019271 petrolatum Nutrition 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 150000003016 phosphoric acids Chemical class 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000008029 phthalate plasticizer Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
- 239000010734 process oil Substances 0.000 description 1
- 229910052903 pyrophyllite Inorganic materials 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000010057 rubber processing Methods 0.000 description 1
- WUQMBBLXLQNCPT-UHFFFAOYSA-N s-(2-triethoxysilylethyl) decanethioate Chemical compound CCCCCCCCCC(=O)SCC[Si](OCC)(OCC)OCC WUQMBBLXLQNCPT-UHFFFAOYSA-N 0.000 description 1
- CDMJANBZBZLJCQ-UHFFFAOYSA-N s-(2-triethoxysilylethyl) dodecanethioate Chemical compound CCCCCCCCCCCC(=O)SCC[Si](OCC)(OCC)OCC CDMJANBZBZLJCQ-UHFFFAOYSA-N 0.000 description 1
- JFYRMIAHMUHLOS-UHFFFAOYSA-N s-(2-triethoxysilylethyl) hexanethioate Chemical compound CCCCCC(=O)SCC[Si](OCC)(OCC)OCC JFYRMIAHMUHLOS-UHFFFAOYSA-N 0.000 description 1
- FHDQCJKIZLIACI-UHFFFAOYSA-N s-(2-trimethoxysilylethyl) decanethioate Chemical compound CCCCCCCCCC(=O)SCC[Si](OC)(OC)OC FHDQCJKIZLIACI-UHFFFAOYSA-N 0.000 description 1
- CSGIYWZXMINHAV-UHFFFAOYSA-N s-(2-trimethoxysilylethyl) dodecanethioate Chemical compound CCCCCCCCCCCC(=O)SCC[Si](OC)(OC)OC CSGIYWZXMINHAV-UHFFFAOYSA-N 0.000 description 1
- PUZLLMXCHBUACY-UHFFFAOYSA-N s-(2-trimethoxysilylethyl) hexanethioate Chemical compound CCCCCC(=O)SCC[Si](OC)(OC)OC PUZLLMXCHBUACY-UHFFFAOYSA-N 0.000 description 1
- HQELTSCAXGZTKK-UHFFFAOYSA-N s-(2-trimethoxysilylethyl) octanethioate Chemical compound CCCCCCCC(=O)SCC[Si](OC)(OC)OC HQELTSCAXGZTKK-UHFFFAOYSA-N 0.000 description 1
- ASAQWGFTVQFUCM-UHFFFAOYSA-N s-(3-triethoxysilylpropyl) decanethioate Chemical compound CCCCCCCCCC(=O)SCCC[Si](OCC)(OCC)OCC ASAQWGFTVQFUCM-UHFFFAOYSA-N 0.000 description 1
- FJDKAMYMVCUZKT-UHFFFAOYSA-N s-(3-triethoxysilylpropyl) dodecanethioate Chemical compound CCCCCCCCCCCC(=O)SCCC[Si](OCC)(OCC)OCC FJDKAMYMVCUZKT-UHFFFAOYSA-N 0.000 description 1
- JPPLPDOXWBVPCW-UHFFFAOYSA-N s-(3-triethoxysilylpropyl) octanethioate Chemical compound CCCCCCCC(=O)SCCC[Si](OCC)(OCC)OCC JPPLPDOXWBVPCW-UHFFFAOYSA-N 0.000 description 1
- CIYYUDUAQHJIQC-UHFFFAOYSA-N s-(3-trimethoxysilylpropyl) dodecanethioate Chemical compound CCCCCCCCCCCC(=O)SCCC[Si](OC)(OC)OC CIYYUDUAQHJIQC-UHFFFAOYSA-N 0.000 description 1
- QMGGNJJTVZQBQW-UHFFFAOYSA-N s-(3-trimethoxysilylpropyl) hexanethioate Chemical compound CCCCCC(=O)SCCC[Si](OC)(OC)OC QMGGNJJTVZQBQW-UHFFFAOYSA-N 0.000 description 1
- KHYCKXNQNMBFAU-UHFFFAOYSA-N s-(3-trimethoxysilylpropyl) octanethioate Chemical compound CCCCCCCC(=O)SCCC[Si](OC)(OC)OC KHYCKXNQNMBFAU-UHFFFAOYSA-N 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 238000013179 statistical model Methods 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 229910052714 tellurium Inorganic materials 0.000 description 1
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- KJAMZCVTJDTESW-UHFFFAOYSA-N tiracizine Chemical compound C1CC2=CC=CC=C2N(C(=O)CN(C)C)C2=CC(NC(=O)OCC)=CC=C21 KJAMZCVTJDTESW-UHFFFAOYSA-N 0.000 description 1
- 235000010215 titanium dioxide Nutrition 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- JNEGECSXOURYNI-UHFFFAOYSA-N trichloro(1,1,2,2,3,3,4,4,5,5,6,6,7,7,10,10,10-heptadecafluorodecyl)silane Chemical compound FC(F)(F)CCC(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)[Si](Cl)(Cl)Cl JNEGECSXOURYNI-UHFFFAOYSA-N 0.000 description 1
- CPUDPFPXCZDNGI-UHFFFAOYSA-N triethoxy(methyl)silane Chemical compound CCO[Si](C)(OCC)OCC CPUDPFPXCZDNGI-UHFFFAOYSA-N 0.000 description 1
- JCVQKRGIASEUKR-UHFFFAOYSA-N triethoxy(phenyl)silane Chemical compound CCO[Si](OCC)(OCC)C1=CC=CC=C1 JCVQKRGIASEUKR-UHFFFAOYSA-N 0.000 description 1
- ASAOXGWSIOQTDI-UHFFFAOYSA-N triethoxy-[2-(2-triethoxysilylethyltetrasulfanyl)ethyl]silane Chemical compound CCO[Si](OCC)(OCC)CCSSSSCC[Si](OCC)(OCC)OCC ASAOXGWSIOQTDI-UHFFFAOYSA-N 0.000 description 1
- FBBATURSCRIBHN-UHFFFAOYSA-N triethoxy-[3-(3-triethoxysilylpropyldisulfanyl)propyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCSSCCC[Si](OCC)(OCC)OCC FBBATURSCRIBHN-UHFFFAOYSA-N 0.000 description 1
- VTHOKNTVYKTUPI-UHFFFAOYSA-N triethoxy-[3-(3-triethoxysilylpropyltetrasulfanyl)propyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCSSSSCCC[Si](OCC)(OCC)OCC VTHOKNTVYKTUPI-UHFFFAOYSA-N 0.000 description 1
- KLFNHRIZTXWZHT-UHFFFAOYSA-N triethoxy-[3-(3-triethoxysilylpropyltrisulfanyl)propyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCSSSCCC[Si](OCC)(OCC)OCC KLFNHRIZTXWZHT-UHFFFAOYSA-N 0.000 description 1
- AOQUKZYKYIPBFR-UHFFFAOYSA-N trihydroxy-nonyl-phenyl-$l^{5}-phosphane Chemical compound CCCCCCCCCP(O)(O)(O)C1=CC=CC=C1 AOQUKZYKYIPBFR-UHFFFAOYSA-N 0.000 description 1
- XYJRNCYWTVGEEG-UHFFFAOYSA-N trimethoxy(2-methylpropyl)silane Chemical compound CO[Si](OC)(OC)CC(C)C XYJRNCYWTVGEEG-UHFFFAOYSA-N 0.000 description 1
- ZNOCGWVLWPVKAO-UHFFFAOYSA-N trimethoxy(phenyl)silane Chemical compound CO[Si](OC)(OC)C1=CC=CC=C1 ZNOCGWVLWPVKAO-UHFFFAOYSA-N 0.000 description 1
- NQRACKNXKKOCJY-UHFFFAOYSA-N trimethoxy-[3-(3-trimethoxysilylpropyldisulfanyl)propyl]silane Chemical compound CO[Si](OC)(OC)CCCSSCCC[Si](OC)(OC)OC NQRACKNXKKOCJY-UHFFFAOYSA-N 0.000 description 1
- YUYCVXFAYWRXLS-UHFFFAOYSA-N trimethoxysilane Chemical compound CO[SiH](OC)OC YUYCVXFAYWRXLS-UHFFFAOYSA-N 0.000 description 1
- ILLOBGFGKYTZRO-UHFFFAOYSA-N tris(2-ethylhexyl) phosphite Chemical compound CCCCC(CC)COP(OCC(CC)CCCC)OCC(CC)CCCC ILLOBGFGKYTZRO-UHFFFAOYSA-N 0.000 description 1
- QEDNBHNWMHJNAB-UHFFFAOYSA-N tris(8-methylnonyl) phosphite Chemical compound CC(C)CCCCCCCOP(OCCCCCCCC(C)C)OCCCCCCCC(C)C QEDNBHNWMHJNAB-UHFFFAOYSA-N 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000008158 vegetable oil Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
- XJUNLJFOHNHSAR-UHFFFAOYSA-J zirconium(4+);dicarbonate Chemical compound [Zr+4].[O-]C([O-])=O.[O-]C([O-])=O XJUNLJFOHNHSAR-UHFFFAOYSA-J 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
リン酸系化合物を、0.5〜15.0質量部と、
ベンズイミダゾール系化合物及びN−シクロヘキシルチオフタルイミドの少なくとも一方を、それぞれ0.05〜3.0質量部と、
を含有するゴム組成物を提供する。
また、本発明では、クロロプレン系ゴム100質量部に対して、
リン酸系化合物を、0.5〜15.0質量部と、
ベンズイミダゾール系化合物を0.05〜3.0質量部と、
N−シクロヘキシルチオフタルイミドを0.05〜3.0質量部と、
を含有するゴム組成物を提供する。
本発明に係るゴム組成物において、前記クロロプレン系ゴムとしては、クロロプレン単一ポリマー、又は、2,3−ジクロロ−1,3−ブタジエン、アクリロニトリル、アクリルアミド、ジメチルアクリルアミド、ブチルアクリレート、2−エチルヘキシルアクリレート、2−メトキシエチルアクリレート、及びスチレンから選ばれる少なくとも一種以上とクロロプレンとの共重合体を用いることができる。
本発明に係るゴム組成物において、前記リン酸系化合物としては、トリメチルホスフェート、トリエチルホスフェート、トリブチルホスフェート、トリス(2−エチルヘキシル)ホスフェート、トリフェニルホスフェート、トリクレジルホスフェート、トリキシレニルホスフェート、クレジルジフェニルホスフェート、2−エチルヘキシルジフェニルホスフェート、トリス(ノニルフェニル)ホスファイトから選ばれる少なくとも一種以上を用いることができる。
本発明に係るゴム組成物において、前記ベンズイミダゾール系化合物としては、2−メルカプトベンズイミダゾール、2−メルカプトメチルベンズイミダゾール、2−メルカプトベンズイミダゾールの亜鉛塩から選ばれる少なくとも一種以上を用いることができる。
本発明に係る加硫成形体は、伝動ベルト、空気バネ、シール、パッキン、防振材、又はホースとして用いることができる。
本実施形態のゴム組成物は、ゴム成分がクロロプレン系ゴムであり、特定量のリン酸系化合物と、特定量のベンズイミダゾール系化合物及び特定量のN−シクロヘキシルチオフタルイミドの少なくとも一方、又は両方を含有する。また、本実施形態のゴム組成物には、前述した各成分に加えて、老化防止剤、カーボンブラック、軟化剤及び充填剤などを配合することもできる。以下、各成分について詳細に説明する。
ゴム成分を構成するクロロプレン系ゴムは、クロロプレンを主成分とする原料単量体を重合した後、必要に応じて洗浄や乾燥を行うことにより得られ、重合反応の生成物である。クロロプレン単独重合体又はクロロプレンと他の単量体との共重合体の他に、重合時に添加された乳化剤、分散剤、触媒、触媒活性化剤、連鎖移動剤及び重合禁止剤などが含まれている場合がある。
リン酸系化合物は、可塑剤や老化防止剤としての効果があり、後述する加硫物や成形加硫物の機械的強度を向上させ、高温圧縮永久歪みを改善させる。しかしながら、リン酸系化合物の添加量が、ゴム成分100質量部あたり0.5質量部未満の場合、高温圧縮永久歪みを改善させるのに十分な効果が得られない。一方、リン酸系化合物の添加量が、ゴム成分100質量部あたり15.0質量部を超えると、ゴムの硬度が低くなり、高温圧縮永久歪みが大きくなり、機械的強度が低下する。よって、リン酸系化合物の添加量は、ゴム成分100質量部あたり、0.5〜15.0質量部とする。特に、後述する加硫物や成形加硫物の機械的強度を更に向上させ、高温圧縮永久歪みを更に改善させるためには、ゴム成分100質量部あたり、0.5〜12.0質量部であるのが好ましく、1.0〜10.0質量部であるのがより好ましい。
ベンズイミダゾール系化合物は、加硫促進剤としての効果があり、クロロプレン系ゴムの加硫速度を調節して、成型時における加工安定性を向上させる。しかしながら、後述するN−シクロヘキシルチオフタルイミドを用いない場合に、ベンズイミダゾール系化合物の添加量が、ゴム成分100質量部あたり0.05質量部未満の場合には、加工安定性を向上させるのに十分な効果が得られない。一方、ベンズイミダゾール系化合物の添加量が、ゴム成分100質量部あたり3.0質量部を超えると、加硫速度が速くなり、加工安定性等が低下する。ここで、加工安定性とは、スコーチタイムにより評価される。加工安定性は、不良発生率に大きく影響し、例えばスコーチタイムが短いと、高温での成形中に未加硫配合物が加硫されて成形不良が発生する頻度が高くなる。よって、ベンズイミダゾール系化合物の添加量は、ゴム成分100質量部あたり、0.05〜3.0質量部とする。特に、成型時における加工安定性を更に向上させるためには、ゴム成分100質量部あたり、0.1〜2.0質量部であるのが好ましく、特に0.1〜1.0質量部であるのがより好ましい。
N−シクロヘキシルチオフタルイミドは、スコーチ防止剤としての効果があり、クロロプレン系ゴムの加硫速度を調節して、成型時における加工安定性を向上させる。しかしながら、前記ベンズイミダゾール系化合物を用いない場合に、N−シクロヘキシルチオフタルイミドの添加量が、ゴム成分100質量部あたり0.05質量部未満の場合には、加工安定性を向上させるのに十分な効果が得られない。一方、N−シクロヘキシルチオフタルイミドの添加量が、ゴム成分100質量部あたり3.0質量部を超えると、加硫速度が遅くなりすぎて架橋密度が低下し、機械的強度や高温圧縮永久歪みが低下する。よって、N−シクロヘキシルチオフタルイミドの添加量は、ゴム成分100質量部あたり、0.05〜3.0質量部とする。特に、成型時における加工安定性を更に向上させるためには、ゴム成分100質量部あたり、0.1〜2.0質量部であるのが好ましく、特に0.1〜1.0質量部であるのがより好ましい。
更に、本実施形態のゴム組成物には、前述した効果が損なわれない範囲で、通常ゴム工業界で用いられる各種薬品、例えば、充填剤、補強剤、軟化剤、可塑剤、老化防止剤、加硫剤、加硫促進剤、スコーチ防止剤、加工助剤などを配合することができる。
本実施形態の加硫物は、前述した第1の実施形態のゴム組成物を、加硫したものである。その際、ゴム組成物の加硫方法は、特に限定されるものではなく、例えば、プレス加硫、インジェクション加硫、直接釜加硫、間接釜加硫、直接蒸気連続加硫、常圧連続加硫又は連続加硫プレスなどの加硫方法により、加硫すればよい。
本実施形態の成形加硫物は、前述した第1の実施形態のゴム組成物を、目的に応じた形状に成形加工して、成形時又は成形後に加硫して得たものである。その成形方法は、特に限定されるものではないが、プレス成形、射出成形及び押出成形などを適用することができる。そして、例えば、成形体が伝動ベルト、空気バネ、シール、パッキン、防振材、ホースなどである場合は、プレス成形や射出成形、押出成形により形成することができる。
下記表1及び表2に示す実施例1〜13及び比較例1〜10の各ゴム組成物を、以下に示す方法及び条件で評価した。
実施例及び比較例の各ゴム組成物について、JIS K 6300に基づいて、L形ロータを用いて125℃におけるスコーチタイムを測定した。なお、スコーチタイムが9分以上のものを合格とした。
実施例及び比較例の各ゴム組成物について、JIS K 6250に基づいてテストピースを作製し(加硫条件:170℃×20分間)、JIS K 6251に基づいて引張試験を行い、各加硫物の機械的強度を測定した。なお、引張り強度(TB)が、17MPa以上のものを合格とした。
実施例及び比較例の各ゴム組成物について、JIS K 6250に基づいてテストピースを作製し(加硫条件:一次加硫170℃×30分間、二次加硫170℃×2時間)、JIS K 6262に基づいて、130℃、72時間の条件で、各加硫物の圧縮永久歪みを測定した。なお、圧縮永久歪み(CS)が、45%以下のものを合格とした。
結果を、下記の表1及び表2に示す。
[クロロプレン系ゴム]
・アクリロニトリル共重合クロロプレンゴム(デンカ株式会社製、アクリロニトリル共重
合量9.5%、統計的共重合体、ムーニー粘度58、特開昭55−145715号公報)
・クロロプレン単一ポリマー(デンカ株式会社製 M−40、ムーニー粘度50)
・2,3−ジクロロ−1,3−ブタジエン共重合クロロプレンゴム(デンカ株式会社製 S−40V、2,3−ジクロロ−1,3−ブタジエン共重合量10.2%、統計的共重合体、ムーニー粘度52)
〔リン酸系化合物〕
・トリス(2−エチルヘキシル)ホスフェート(大八化学工業株式会社製 TOP)
・トリス(ノニルフェニル)ホスファイト(大内新興化学工業株式会社製 ノクラックTNP)
〔脂肪族二塩基酸エステル〕
・ビス(2−エチルヘキシル)セバケート(大八化学工業株式会社製、DOS)
〔ベンズイミダゾール系化合物〕
・2−メルカプトベンズイミダゾール(大内新興化学工業株式会社製 ノクラックMB)
・2−メルカプトメチルベンズイミダゾール(大内新興化学工業株式会社製 ノクラック)
〔N−シクロヘキシルチオフタルイミド〕
・N−シクロヘキシルチオフタルイミド(大内新興化学工業株式会社製 リターダーCTP)
〔チウラム系化合物〕
・テトラメチルチウラムジスルフィド(大内新興化学工業株式会社製、ノクセラーTT−P)
・ステアリン酸(新日本理化株式会社製 ステアリン酸50S)
・オクチル化ジフェニルアミン(大内新興化学工業株式会社製 ノクラックAD−F)
・カーボンブラックSRF(旭カーボン株式会社製 旭#50)
・MgO(協和化学工業株式会社製 キョーワマグ150)
・ZnO(堺化学工業株式会社製 酸化亜鉛2種)
・トリメチルチオウレア(大内新興化学工業株式会社製 ノクセラーTMU)
前記表1に示すように、リン酸系化合物を含有しない比較例1及びリン酸系化合物以外の可塑剤である脂肪族二塩基酸エステルを含有した比較例9は、高温圧縮永久歪みが劣っていた。一方、リン酸系化合物を含有していても、その添加量が0.5質量部未満である比較例3は、高温圧縮永久歪みが劣っていた。また、リン酸系化合物の添加量が15.0質量部を超えている比較例4は、ゴムの硬度が低くなり、高温圧縮永久歪みや機械的強度(引張り強度(TB))が劣っていた。
Claims (8)
- クロロプレン系ゴム100質量部に対して、
リン酸系化合物を、0.5〜15.0質量部と、
ベンズイミダゾール系化合物及びN−シクロヘキシルチオフタルイミドの少なくとも一方を、それぞれ0.05〜3.0質量部と、
を含有するゴム組成物。 - クロロプレン系ゴム100質量部に対して、
リン酸系化合物を、0.5〜15.0質量部と、
ベンズイミダゾール系化合物を0.05〜3.0質量部と、
N−シクロヘキシルチオフタルイミドを0.05〜3.0質量部と、
を含有するゴム組成物。 - 前記クロロプレン系ゴムが、クロロプレン単一ポリマー、又は、2,3−ジクロロ−1,3−ブタジエン、アクリロニトリル、アクリルアミド、ジメチルアクリルアミド、ブチルアクリレート、2−エチルヘキシルアクリレート、2−メトキシエチルアクリレート、及びスチレンから選ばれる少なくとも一種以上とクロロプレンとの共重合体である、請求項1又は2に記載のゴム組成物。
- 前記リン酸系化合物が、トリメチルホスフェート、トリエチルホスフェート、トリブチルホスフェート、トリス(2−エチルヘキシル)ホスフェート、トリフェニルホスフェート、トリクレジルホスフェート、トリキシレニルホスフェート、クレジルジフェニルホスフェート、2−エチルヘキシルジフェニルホスフェート、トリス(ノニルフェニル)ホスファイトから選ばれる少なくとも一種以上である、請求項1〜3のいずれか一項に記載のゴム組成物。
- 前記ベンズイミダゾール系化合物が、2−メルカプトベンズイミダゾール、2−メルカプトメチルベンズイミダゾール、2−メルカプトベンズイミダゾールの亜鉛塩から選ばれる少なくとも一種以上である、請求項1〜4のいずれか一項に記載のゴム組成物。
- 請求項1〜5のいずれか一項に記載のゴム組成物の加硫物。
- 請求項1〜5のいずれか一項に記載のゴム組成物の加硫成形体。
- 伝動ベルト、空気バネ、シール、パッキン、防振材、又はホースである、請求項7に記載の加硫成形体。
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