JP7208322B2 - カーボンナノチューブを含むタイヤ用ゴム組成物及びその製造方法 - Google Patents
カーボンナノチューブを含むタイヤ用ゴム組成物及びその製造方法 Download PDFInfo
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- JP7208322B2 JP7208322B2 JP2021155074A JP2021155074A JP7208322B2 JP 7208322 B2 JP7208322 B2 JP 7208322B2 JP 2021155074 A JP2021155074 A JP 2021155074A JP 2021155074 A JP2021155074 A JP 2021155074A JP 7208322 B2 JP7208322 B2 JP 7208322B2
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims description 111
- 239000002041 carbon nanotube Substances 0.000 title claims description 106
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- OWRCNXZUPFZXOS-UHFFFAOYSA-N 1,3-diphenylguanidine Chemical compound C=1C=CC=CC=1NC(=N)NC1=CC=CC=C1 OWRCNXZUPFZXOS-UHFFFAOYSA-N 0.000 description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
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- CBXRMKZFYQISIV-UHFFFAOYSA-N 1-n,1-n,1-n',1-n',2-n,2-n,2-n',2-n'-octamethylethene-1,1,2,2-tetramine Chemical compound CN(C)C(N(C)C)=C(N(C)C)N(C)C CBXRMKZFYQISIV-UHFFFAOYSA-N 0.000 description 2
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- UNPVYIHCZUOWEI-UHFFFAOYSA-N C1(CCCCC1)N1C(SC2=C1C=CC=C2)[S] Chemical compound C1(CCCCC1)N1C(SC2=C1C=CC=C2)[S] UNPVYIHCZUOWEI-UHFFFAOYSA-N 0.000 description 2
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- 229910019614 (NH4)6 Mo7 O24.4H2 O Inorganic materials 0.000 description 1
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- 150000004703 alkoxides Chemical class 0.000 description 1
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical group [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- FIXLYHHVMHXSCP-UHFFFAOYSA-H azane;dihydroxy(dioxo)molybdenum;trioxomolybdenum;tetrahydrate Chemical compound N.N.N.N.N.N.O.O.O.O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O[Mo](O)(=O)=O.O[Mo](O)(=O)=O.O[Mo](O)(=O)=O FIXLYHHVMHXSCP-UHFFFAOYSA-H 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
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- 230000003197 catalytic effect Effects 0.000 description 1
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- 229910001873 dinitrogen Inorganic materials 0.000 description 1
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- 238000001035 drying Methods 0.000 description 1
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- 238000010438 heat treatment Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 229910001960 metal nitrate Inorganic materials 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- RQFLGKYCYMMRMC-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O.CCCCCCCCCCCCCCCCCC(O)=O RQFLGKYCYMMRMC-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
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- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
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Description
hysteresis(熱ヒステリシス、熱履歴)が最小化されて燃費、制動及び摩耗特性が顕著に向上され得る。
本発明の一側面は、表面のうち少なくとも一部に構造的欠陷を含み、熱分解温度が600℃以下であるカーボンナノチューブ;及びゴムマトリックスを含むタイヤ用ゴム組成物を提供する。
本発明の他の一側面は、(a)下記式による金属成分を含み、外壁の厚さが0.5~10μmである中空(中孔)構造を有する触媒を用いて表面のうち少なくとも一部に構造的欠陷を含み、熱分解温度が600℃以下であるカーボンナノチューブを製造するステップ;及び(b)前記カーボンナノチューブとゴムを混合するステップ;を含む、タイヤ用ゴム組成物の製造方法を提供する。前記カーボンナノチューブとゴムの構造、形態、種類、作用効果などに対しては上述した通りである。
Fe(NO3)3・9H2O、Co(NO3)3・6H2O、(NH4)6Mo7O24・4H2O、NH4VO3、(NH4)10H2(W2O7)6・9H2O及びAl(NO3)3・9H2Oのうち下記表1の触媒組成に必要なそれぞれの前駆体を脱イオン水に溶解させて前駆体溶液を製造した。前記前駆体溶液を時間当たり3Lずつ空気とともに反応器の内部に噴霧して熱分解することで触媒粉末を収得した。このとき、熱分解条件は、空気の圧力は、3気圧、反応器の内部温度は、750℃であり、120分間連続的に運転した。
前記合成例及び比較合成例による触媒粉末を用いてカーボンナノチューブの合成を進行した。具体的に、それぞれの触媒粉末を直径350mmの流動層化学気相蒸着反応器に投入し、窒素雰囲気で700~800℃まで昇温して維持させた。その後、窒素及びエチレンが混合されたガスを分当たり150Lの速度で供給しながら40分間反応させてそれぞれの触媒粉末に成長したカーボンナノチューブを合成した。
(製造例1:ゴム-カーボンナノチューブマスターバッチの製造)
0.5Lのバンバリー(Banbury)ミキサーに363.6gのブタジエンゴム(錦湖石油化学NdBR40)を投入し、50℃で40rpmの回転速度で1分間混合した後、実施例2のカーボンナノチューブ36.4g(10phr)を投入して45rpmの回転速度で3分、60rpmの回転速度で3分間追加混合した。混合された配合物を1mm間隙のオープンロールに投入して素練り作業及び三角折りをそれぞれ3回実施した後、シート形態に成形することでブタジエンゴム-カーボンナノチューブマスターバッチを製造した。
バンバリーミキサーにスチレン-ブタジエンゴム(SSBR、錦湖石油化学SOL5360H)70重量部、ブタジエンゴム(BR、錦湖石油化学NdBR40)30重量部に対して、酸化亜鉛(ZnO)3重量部、ステアリン酸(stearic acid)2重量部、シリカ(ZEOSIL 7000GR)80重量部、カーボンナノチューブ1重量部、カップリング剤(X-50S)12.8重量部、工程オイル(TDAE)25重量部、酸化防止剤(6PPD)1重量部を投入し、60℃で60~75rpmで7分50秒間混練して1次配合組成物を得た。
7000GR)80重量部、カップリング剤(X-50S)12.8重量部、工程オイル(TDAE)25重量部、酸化防止剤(6PPD)1重量部を投入し、60℃で60~75rpmで7分50秒間混練して1次配合組成物を得た。
Claims (12)
- 前記触媒の見掛密度が0.05~0.35g/mLであることを特徴とする、請求項1に記載のタイヤ用ゴム組成物。
- 前記触媒の外壁の厚さが1~8μmであることを特徴とする、請求項1または2に記載のタイヤ用ゴム組成物。
- 前記中空(中孔)構造の中空(中孔)割合が60体積%以上であることを特徴とする、請求項1~3のいずれか1項に記載のタイヤ用ゴム組成物。
- 前記束型カーボンナノチューブの平均束直径(bundle diameter)が0.5~20μmであり、平均束長さ(bundle length)が10~200μmであることを特徴とする、請求項1~4のいずれか1項に記載のタイヤ用ゴム組成物。
- 前記多重壁カーボンナノチューブのラマン分光強度比(IG/ID)が0.8~1.5であることを特徴とする、請求項1~5のいずれか1項に記載のタイヤ用ゴム組成物。
- 前記多重壁カーボンナノチューブの平均直径が5~50nmであることを特徴とする、請求項1~6のいずれか1項に記載のタイヤ用ゴム組成物。
- 前記多重壁カーボンナノチューブの見掛密度が0.005~0.120g/mLであることを特徴とする、請求項1~7のいずれか1項に記載のタイヤ用ゴム組成物。
- 前記ゴムマトリックスは、アクリロニトリル-ブタジエンゴム、エチレン-プロピレン-ジエンゴム、スチレン-ブタジエンゴム、ブタジエンゴム、天然ゴム、イソプレンゴム、ブチルゴム及びこれらのうち2以上の組合せからなる群より選択された一つを含むことを特徴とする、請求項1~8のいずれか1項に記載のタイヤ用ゴム組成物。
- 前記カーボンナノチューブの含量は、前記ゴムマトリックス100重量部に対して0.1~10重量部であることを特徴とする、請求項1~9のいずれか1項に記載のタイヤ用ゴム組成物。
- 前記ステップ(b)は、(b1)前記カーボンナノチューブ及び前記ゴムの一部を混合及び加圧してマスターバッチを製造するステップ;及び(b2)前記マスターバッチ及び前記ゴムの残部を混合するステップ;を含むことを特徴とする、請求項11に記載のタイヤ用ゴム組成物の製造方法。
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