JP6069240B2 - 冬用空気入りタイヤ及びその製造方法 - Google Patents
冬用空気入りタイヤ及びその製造方法 Download PDFInfo
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- JP6069240B2 JP6069240B2 JP2014046443A JP2014046443A JP6069240B2 JP 6069240 B2 JP6069240 B2 JP 6069240B2 JP 2014046443 A JP2014046443 A JP 2014046443A JP 2014046443 A JP2014046443 A JP 2014046443A JP 6069240 B2 JP6069240 B2 JP 6069240B2
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Description
本発明におけるゴム組成物は、ゴム成分及びミクロフィブリル化植物繊維を含む。ミクロフィブリル化植物繊維を添加することで、トレッド表面に微細な起伏を生じさせ、掘り起こし摩擦を起こすことができる。また、ミクロフィブリル化植物繊維同士が絡み合うことで、低燃費性を良好にし、ミクロフィブリル化植物繊維の親水性効果により、凍結路に対する粘着摩擦効果も期待できる。これらの作用により、氷上性能、低燃費性及びウェットグリップ性能の性能バランスを改善できるものと推察される。
これは、ユーグレナ属に属する微細藻類は、培養が容易な上、好気性条件下で培養すると、炭水化物としてパラミロンを細胞内に蓄積し、その後、嫌気性条件下で培養することにより、蓄積されたパラミロンが分解されてオイル((高級)脂肪酸と(高級)脂肪族アルコールとのエステル)が生成することが知られており(特開昭59−118090号公報)、更に、本発明者らが該オイルを可塑剤成分としてゴム組成物に配合することにより、本発明の効果をより効果的に得られることを見出したからである。
100質量部を超えると、充分なウェットグリップ性能が得られないおそれがある。
グルコース:ナカライテスク(株)製
硫酸アンモニウム:関東化学(株)製
コーンスティープリカー:王子コーンスターチ(株)製
硫酸マグネシウム:関東化学(株)製
リン酸一カリウム:和光純薬工業(株)製
エチレンジアミン四酢酸ナトリウム塩:ナカライテスク(株)製
モール塩:和光純薬工業(株)製
硫酸亜鉛:和光純薬工業(株)製
硫酸マンガン:関東化学(株)製
ビタミンB1:シグマアルドリッチ社製
ビタミンB12:シグマアルドリッチ社製
更に、遠心分離により培養細胞を採取し、pH6.8のリン酸バッファーに懸濁し、室内光の下、1分間に20mlの窒素ガス通気下で2日間、120rpmの嫌気的な条件で振盪培養した。
その後、培養細胞は超音波処理により破砕を行い、(クロロホルム:メタノール=1:2)の溶液により、オイル成分を抽出し、微細藻類由来のオイル2.8gを得た。
天然ゴムラテックス:HYTEX HA(Golden Hope Plantations(ゴールデン・ホープ・プランテーションズ)社製の天然ゴムラテックス、固形分:60質量%、平均粒径:1μm)
ミクロフィブリル化植物繊維:ダイセル化学工業(株)製のセリッシュKY−100G(平均繊維長:0.5mm、平均繊維径:0.02μm、固形分:10質量%)
テレビン油:日本テルペン化学(株)製テレピン油
微細藻類由来のオイル:上記調製例を参照
表1の配合に従い、高速ホモジナイザー(IKA社製のバッチ式ホモジナイザーT65Dウルトラタラックス(Ultraturrax T25))を用いて、24,000rpmの条件でミクロフィブリル化植物繊維及びテレビン油を水中で1時間撹拌分散させ、ついで天然ゴムラテックスを添加し、さらに30分撹拌分散させた。得られた混合液を5質量%ギ酸水溶液で凝固し、水洗後、40℃の加熱オーブン中で乾燥させることでマスターバッチ1を得た。
テレビン油の代わりに微細藻類由来のオイルを用いたこと以外はマスターバッチ1と同様の方法でマスターバッチ2を得た。
テレビン油を配合しない点以外はマスターバッチ1と同様の方法でマスターバッチ3を得た。
天然ゴムラテックスをそのまま5%ギ酸水溶液で凝固し、水洗後、40℃の加熱オーブン中で乾燥させることでマスターバッチ4を得た。
BR:宇部興産(株)製のUBEPOL BR150B
マスターバッチ1〜4:上記製造例で調製
カーボンブラック:キャボットジャパン(株)製のショウブラックN220
オイル:出光興産(株)製のダイアナプロセスオイルPS323
老化防止剤:大内新興化学工業(株)製のノクラック6C
ステアリン酸:日油(株)製のビーズステアリン酸つばき
酸化亜鉛:三井金属鉱業(株)製の酸化亜鉛2種
硫黄:鶴見化学工業(株)製の粉末硫黄
加硫促進剤:大内新興化学工業(株)製のノクセラーDM
−5℃に温度制御された恒温室内に設置された−2℃の氷面上に、前記加硫ゴム組成物を2kg/cm2で押し付け、20km/hで滑らせるときの摩擦係数(氷上摩擦係数)を測定し、比較例1の氷上摩擦性能指数を100とし、下記計算式により、各配合の氷上摩擦係数を指数表示した。氷上摩擦性能指数が大きいほど、空気入りタイヤとして用いた場合に、氷上摩擦性能が高く、氷上性能に優れることを示す。
(氷上摩擦性能指数)=(各配合の氷上摩擦係数)/(比較例1の氷上摩擦係数)×100
前述の方法で調製された加硫ゴム組成物の2mmゴムスラブシートから測定用試験片を切り出し、粘弾性スペクトロメータVES((株)岩本製作所製)を用いて、温度0℃、初期歪み10%、動歪み0.5%の条件下で各配合の損失正接(tanδ)を測定し、比較例1のtanδを100として、下記計算式により指数表示した(ウェットグリップ性能指数)。指数が大きいほど、空気入りタイヤとして用いた場合に、ウェットグリップ性能が優れることを示す。
(ウェットグリップ性能指数)=(各配合のtanδ)/(比較例1のtanδ)×100
前述の方法で調製された加硫ゴム組成物の2mmゴムスラブシートから測定用試験片を切り出し、粘弾性スペクトロメータVES((株)岩本製作所製)を用いて、温度70℃、初期歪10%、動歪2%、周波数10Hzの条件下で、各測定用試験片のtanδ(損失正接)を測定し、比較例1のtanδを100として、下記計算式により指数表示した(転がり抵抗指数)。
(転がり抵抗指数)=(各配合のtanδ)/(比較例1のtanδ)×100
転がり抵抗指数が小さい程、空気入りタイヤとして用いた場合に良好な転がり抵抗特性(低燃費性)を与えることを示す。
Claims (14)
- ゴム成分及びミクロフィブリル化植物繊維を含むゴム組成物を用いて作製したトレッドを有する冬用空気入りタイヤ。
- 前記ゴム成分が、天然ゴム、改質天然ゴム、合成ゴム及び変性合成ゴムからなる群より選択される少なくとも1種を含む請求項1記載の冬用空気入りタイヤ。
- 前記ミクロフィブリル化植物繊維がセルロースミクロフィブリルである請求項1又は2記載の冬用空気入りタイヤ。
- 前記ミクロフィブリル化植物繊維の平均繊維径が10μm以下である請求項1〜3のいずれかに記載の冬用空気入りタイヤ。
- 前記ミクロフィブリル化植物繊維の含有量が、前記ゴム成分100質量部に対して1〜100質量部である請求項1〜4のいずれかに記載の冬用空気入りタイヤ。
- オイルとして、テレビン油及び/又は微細藻類由来のオイルを含む請求項1〜5のいずれかに記載の冬用空気入りタイヤ。
- 前記テレビン油の含有量がゴム成分100質量部に対して0.01〜50質量部である請求項6記載の冬用空気入りタイヤ。
- 前記微細藻類が、Euglenophyceae網に属する微細藻類である請求項6記載の冬用空気入りタイヤ。
- 前記微細藻類が、ユーグレナ属に属する微細藻類である請求項6又は8記載の冬用空気入りタイヤ。
- 前記微細藻類由来のオイルが、前記微細藻類を培養した後、精製することにより得られたオイル成分である請求項6、8及び9のいずれかに記載の冬用空気入りタイヤ。
- 前記微細藻類由来のオイルが、前記微細藻類を、脂肪酸を添加した培地で培養することにより得られたものである請求項6、8、9及び10のいずれかに記載の冬用空気入りタイヤ。
- 前記微細藻類由来のオイルが、前記微細藻類を、好気性条件で培養した後、嫌気性条件で培養することにより得られたものである請求項6、8、9、10及び11のいずれかに記載の冬用空気入りタイヤ。
- 前記ミクロフィブリル化植物繊維及び前記ゴム成分を予め混合する工程(A)を含む請求項1〜12のいずれかに記載の冬用空気入りタイヤの製造方法。
- 前記ミクロフィブリル化植物繊維並びに、前記テレビン油及び/又は微細藻類由来のオイルを混合する工程(a)と、該工程で得られた混合物と前記ゴム成分を更に混合する工程(A)とを含む請求項13に記載の製造方法。
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