JP2023541701A - 天然ゴムを得るための方法、天然ゴムを含有するゴム組成物及びその使用 - Google Patents
天然ゴムを得るための方法、天然ゴムを含有するゴム組成物及びその使用 Download PDFInfo
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- JP2023541701A JP2023541701A JP2023518207A JP2023518207A JP2023541701A JP 2023541701 A JP2023541701 A JP 2023541701A JP 2023518207 A JP2023518207 A JP 2023518207A JP 2023518207 A JP2023518207 A JP 2023518207A JP 2023541701 A JP2023541701 A JP 2023541701A
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- rubber
- saghyz
- natural rubber
- aging
- plant material
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Classifications
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Abstract
Description
によるp-クレゾール及びジシクロペンタジエンのブチル化反応生成物の混合物(例えば、Omnova SolutionsからWingstay(登録商標)Lの名称で販売されている製品)から選択される。
(i)天然ゴム又は合成ゴムから選択される更なる種類のゴム、
(ii)フィラー、好ましくはカーボンブラック及び/又はシリカ、
(iii)可塑剤、
(iv)活性化剤、
(v)接着剤、
(vi)顔料、
(vii)加硫促進剤、
(viii)加硫遅延剤、
(ix)更なる架橋剤、
(x)他の混和物。
表1に示す様々な老化安定剤を8時間の保温時間にわたって天然ゴムと接触させた。製造したゴムは、70℃で最大14日間保管した。老化に対する安定性は、ゲル浸透クロマトグラフィーによって天然ゴムポリマーの数平均(Mn)及び重量平均(Mw)分子量を決定することにより、得られたゴムで決定した。これから多分散度を計算することができる。これらの値を経時的に比較すると、ゴムの老化の尺度が得られる。
(2)LNR=タンポポ由来の天然ゴム、この場合にはタラクサカム・コクサギーズ(Taraxacum kok-saghyz)
(3)IR:合成ゴム
(4)NR:パラゴムノキ(へベア・ブラジリエンシス(Hevea brasiliensis))由来の天然ゴム
老化防止なしのLNR:2.55:分子量の低下、老化
BHTを含むLNR:2.0:平均の老化
Wingstay(登録商標)を含むLNR:1.7:平均の老化
IR:1.46:わずかに老化
NR:1.03:事実上分子量の低下がなく、材料の老化がほとんどない
タイヤの製造に適したゴム組成物を製造するために、表2に示す更なる成分を、実施例1に従って製造した天然ゴム組成物1~6並びに同様にバッチ11及び12に従ってビタミンE誘導体と混合された天然ゴムに取り込んだ。この目的のために、ゴム組成物1~6及び11及び12(表2を参照されたい)のそれぞれ100重量部を、表3に示す更なる成分(重量部)と混合し、加工してゴム材料を形成した。
バッチ番号
1.老化防止なしのLNR、フレッシュ
2.老化防止なしのLNR、14日/70℃で老化
3.BHTを含むLNR、フレッシュ
4.BHTを含むLNR、14日/70℃で老化
5.Wingstay(登録商標)を含むLNR、フレッシュ
6.Wingstay(登録商標)を含むLNR、14日/70℃で老化
11.DMT3を含むLNR、フレッシュ
12.DMT3を含むLNR、14日/70℃で老化
LNR=タンポポ、この場合にはタラクサカム・コクサギーズ(Taraxacum kok-saghyz)由来の天然ゴム
・DIN ISO7619-1に準拠したデュロメータを使用した、室温及び70℃におけるショアA硬度[ショアA]
・DIN53512又はISO4662又はASTM D1054に準拠した室温及び70℃における反発弾性[%]
・DIN53504に準拠した、室温における100%、200%及び300%の伸びでの応力値(弾性率)[MPa]
・DIN53504に準拠した室温における引張強さ[MPa]
・DIN53504に準拠した室温における破断伸び[%]
・DIN53504に準拠した引張試験で測定された破壊エネルギー密度。破壊エネルギー密度は、試験片の体積を基準とした破壊に要する仕事量である[J/cm3]
・DIN53516又は新しいDIN/ISO4649に準拠した室温における摩耗[mm3]
(A)反発弾性の差の低下が小さいほど、車両用タイヤの転がり抵抗とウェットグリップとの間のトレードオフに有利であり、
(B)老化後の引張強さの低下が少ないほど耐久性が優れており、
(C)老化後の破壊エネルギー密度の低下が小さいほど耐久性に優れており、
(D)老化後のDIN摩耗が小さいほど、タイヤの寿命が長くなる。
Claims (13)
- 耐老化性天然ゴムを得るための方法であって、
(I)ポリマー含有樹液を含む植物材料を提供する工程であって、前記ポリマー含有樹液は、少なくとも天然ポリイソプレンを含有する、工程、
(II)前記樹液及び/又はその成分が残りの植物組織から分離されるように、前記植物/前記植物材料を処理する工程、
(III)前記植物材料/前記ポリマー含有樹液及び/又はその成分を少なくとも1種の老化安定剤と接触させる工程、
(IV)前記天然ポリイソプレンを凝固及び/又は凝集させて、天然ゴムフレークをもたらす工程、
(V)任意選択的に、前記天然ゴムフレークを洗浄する工程、
(VI)抽出液/洗浄液から前記天然ゴムフレークを得る工程、
(VII)任意選択的に、前記天然ゴムを乾燥する工程、
(VIII)任意選択的に、前記天然ゴムに前記老化安定剤を取り込む工程
を含み、工程(III)による前記老化安定剤の前記接触は、前記天然ゴムの前記乾燥前又は遅くともその間に行われる、方法。 - 新鮮であり、任意選択的に貯蔵されているが、別途乾燥されていない植物材料を用いて行われる、請求項1に記載の方法。
- 工程(III)は、工程(II)前、その間若しくはその後、工程(IV)前、その間若しくはその後及び/又は工程(V)前若しくはその間であるが、いずれの場合にも工程(VII)前又は遅くともその間に行われる、請求項1又は2に記載の方法。
- 前記ポリマー含有樹液及び/又はその成分は、タンポポ属(Taraxacum sp.)又はフタナミソウ属(Scorzonera sp.)から、特にロシアタンポポ、例えばタラクサカム・コクサギーズ(Taraxacum kok-saghyz)、タラクサカム・クリムサギーズ(Taraxacum krim-saghyz)、タラクサカム・ビコルネ(Taraxacum bicorne)、タラクサカム・ブレビコーニクラタム(Taraxacum brevicorniculatum)から、若しくはスコルツォネラ・タウサギーズ(Scorzonera tau-saghyz)、スコルツォネラ・ウズベキスタニカ(Scorzonera Uzbekistanica)、スコルツォネラ・タカサギーズ(Scorzonera taka-saghyz)、スコルツォネラ・ヒスパニカ(Scorzonera hispanica)、スコルツォネラ・タウサギーズ(Scorzonera tau-saghyz)又は前記植物の混合から、好ましくはタラクサカム・コクサギーズ(Taraxacum kok-saghyz)、スコルツォネラ・タウサギーズ(Scorzonera tau-saghyz)、スコルツォネラ・ウズベキスタニカ(Scorzonera Uzbekistanica)、スコルツォネラ・テケサギーズ(Scorzonera teke-saghyz)或いはこれらの混合又は天然の若しくは栽培された雑種から、更に好ましくは少なくともタラクサカム・コクサギーズ(Taraxacum kok-saghyz)、タラクサカム・クリムサギーズ(Taraxacum krim-saghyz)又はこれらの混合若しくはこれらの関与を伴う雑種から、特に好ましくは少なくともタラクサカム・コクサギーズ(Taraxacum kok-saghyz)から選択される少なくとも1つの植物材料から抽出される、請求項1~3のいずれか一項に記載の方法。
- 前記老化安定剤は、ブチル化ヒドロキシトルエン(BHT)、少なくとも1つの立体異性形態のビタミンE若しくはその誘導体、N-C1~12-アルキル-N’-フェニル-p-フェニレンジアミン、例えばN-イソプロピル-N’-フェニル-p-フェニレンジアミン、N-1,3-ジメチルブチル-N’-フェニル-p-フェニレンジアミン(6PPD)、N-1,4-ジメチルペンチル-N’-フェニル-p-フェニレンジアミン(7PPD)若しくはN,N’-ビス-1,4-(1,4-ジメチルペンチル)-p-フェニレンジアミン(77PD)、ジアリール-p-フェニレンジアミン(DTPD)、4,4’-ビス(C1~12-アルキルアミノ)トリフェニルアミン、7,8-ジメチルイソアロキサジン若しくは構造ビルディングブロックとして7,8-ジメチルイソアロキサジンを含有する化合物、例えばリボフラビン、p-フェニレンジアミン、p-ジ(ニトロソ)アレーン、例えばポリ-p-ジ(ニトロソ)ベンゼン、オリゴマー化2,2,4-トリメチル-1,2-ジヒドロキノリン(TMQ)、スチレン化ジフェニルアミン(DDA)、クミル化ジフェニルアミン、4-及び5-メチルメルカプトベンズイミダゾールの亜鉛塩、2,6-ジ-tert-ブチルフェノール、2,6-ジ-tert-ブチル-4-エチルフェノール、2,2’-メチレンビス(6-tert-ブチル)-p-クレゾール、ポリ(ジシクロペンタジエン-co-p-クレゾール)、n-オクタデシルベータ-(4-ヒドロキシ-3,5-ジ-tert-ブチルフェニル)プロピオネート、2,2’-メチレンビス(4-メチル-6-tert-ブチルフェノール)(BPH)、2-メチル-4,6-ビス(オクチルスルファニルメチル)フェノール、チオビスフェノール、4,4’-ビス(1,1-ジメチルベンジル)ジフェニルアミン(CDPA)、オクチル化ジフェニルアミン(ODPA)、フェニル-a-ナフチルアミン(PAN)、フェニル-ベータ-ナフチルアミン(PBN)、トリス(ノニルフェニル)ホスファイト、次亜リン酸ナトリウム、2,2,4-トリメチル-1,2-ジヒドロキノリン(TMQ)、2-メルカプトベンズイミダゾール(MBI)、メチル-2-メルカプトベンズイミダゾール(MMBI)又は前述したものの任意の組み合わせから選択され、ブチル化ヒドロキシトルエン(BHT)、トコフェロール又はトコトリエノールの形態のビタミンE、ジ-n-ブチルジチオカルバミン酸の亜鉛塩並びに式(I)
によるp-クレゾール及びジシクロペンタジエンのブチル化反応生成物の混合物から選択される前記老化安定剤が好ましく、老化安定剤として少なくともブチル化ヒドロキシトルエン(BHT)を使用することが特に好ましい、請求項1~4のいずれか一項に記載の方法。 - 前記植物材料は、少なくともロシアタンポポ、特にタラクサカム・コクサギーズ(Taraxacum kok-saghyz)を含み、及び少なくとも1種の老化安定剤は、BHT、ビタミンE又はその誘導体及び式(I)(ここで、n=1、2、3、4、5、6、7、8又は9である)による化合物から選択される、請求項1~5のいずれか一項に記載の方法。
- 前記老化安定剤は、それが、得られる前記天然ゴム中に少なくとも0.01phrの合計量、好ましくは0.05~5phr、更に好ましくは0.10~3.5phr、特に好ましくは0.25~2phr、最も好ましくは0.4~1phrの量で存在するような量で前記植物材料/前記ポリマー含有樹液及び/又はその成分に添加される、請求項1~6のいずれか一項に記載の方法。
- 前記老化安定剤は、粉末、懸濁液、液体又は溶液の形態で前記植物材料/前記ポリマー含有樹液及び/又はその - 任意選択的に精製されている - 成分に添加される、請求項1~7のいずれか一項に記載の方法。
- 前記天然ゴムへの前記老化安定剤の前記接触は、以下の条件:
(i)-25℃~100℃、好ましくは0℃~90℃、特に好ましくは10℃~80℃の範囲の温度におけるものであること、
(ii)機械的撹拌、好ましくは撹拌、圧延、粉砕若しくは混練又はそれらの組み合わせ或いは水中におけるゴムと老化安定剤との懸濁液中での拡散によるものであること、
(iii)少なくとも10分間、好ましくは少なくとも30分間、更に好ましくは少なくとも1時間の期間にわたるものであること
の少なくとも1つの下で行われる、請求項1~8のいずれか一項に記載の方法。 - 請求項1~9のいずれか一項に記載の方法によって製造された天然ゴムを含有するゴム組成物。
- 以下の添加剤:
(i)天然ゴム又は合成ゴムから選択される更なる種類のゴム、
(ii)フィラー、好ましくはカーボンブラック及び/又はシリカ、
(iii)可塑剤、
(iv)活性化剤、
(v)接着剤、
(vi)顔料、
(vii)加硫促進剤、
(viii)加硫遅延剤、
(ix)更なる架橋剤、
(x)他の混和物
の少なくとも1つを追加的に含む、請求項10に記載のゴム組成物。 - ゴム物品の製造のための、請求項10又は11に記載のゴム組成物の使用。
- 請求項10又は11に記載のゴム組成物から製造されたゴム物品であって、好ましくは、タイヤ、特に車両用タイヤ若しくはタイヤ部品、ベローズ、コンベヤベルト、空気ばね、ベルト、駆動ベルト、例えばVベルト、歯付ベルト、平ベルト、Vリブドベルト、ホース、靴底、ゴムリング、医療用物品又はチューブから選択されるゴム物品。
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US4559378A (en) * | 1984-08-30 | 1985-12-17 | The Firestone Tire & Rubber Company | Stabilization of elastomers with aliphatic-phenyl diamines and aliphatic phosphite compounds |
US4568711A (en) | 1984-12-07 | 1986-02-04 | The Firestone Tire & Rubber Company | Synergistic additive combination for guayule rubber stabilization |
DE19818564A1 (de) | 1998-04-25 | 1999-11-11 | Continental Ag | Kautschukmischung |
US7540438B2 (en) | 2006-05-23 | 2009-06-02 | Buranov Anvar U | Process for recovering rubber from rubber-bearing plants with a gristmill |
FR2908416B1 (fr) | 2006-11-09 | 2009-01-16 | Michelin Soc Tech | Composition de caoutchouc pour pneumatique incorporant un nouveau systeme anti-oxydant |
FR2931158B1 (fr) | 2008-05-15 | 2010-07-30 | Michelin Soc Tech | Composition de caoutchouc pour pneumatique incorporant un nouveau systeme anti-oxydant |
US8182626B2 (en) | 2008-10-30 | 2012-05-22 | Continental Ag | Tire composition with improved vulcanizing agent |
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ES2638943T3 (es) * | 2012-05-16 | 2017-10-24 | Bridgestone Corporation | Composiciones que contienen caucho no procedente de hevea purificado y métodos de purificación relacionados |
DE102013107279A1 (de) | 2013-07-10 | 2015-01-15 | Continental Reifen Deutschland Gmbh | Verfahren zur Trennung von Naturkautschuk-Material aus Wurzelmaterial von Löwenzahn |
JP6440520B2 (ja) | 2015-02-17 | 2018-12-19 | 住友ゴム工業株式会社 | ラテックスの採取方法、キク科に属する植物の栽培方法、空気入りタイヤの製造方法及びゴム製品の製造方法 |
EA201891090A1 (ru) | 2015-11-03 | 2018-10-31 | Киджин Н.В. | Способ экстракции каучука |
ITUB20159548A1 (it) | 2015-12-15 | 2017-06-15 | Bridgestone Corp | Agenti anti-invecchiamento per prodotti polimerici |
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