JP6135259B2 - Rubber composition and pneumatic tire using the same - Google Patents
Rubber composition and pneumatic tire using the same Download PDFInfo
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- JP6135259B2 JP6135259B2 JP2013079432A JP2013079432A JP6135259B2 JP 6135259 B2 JP6135259 B2 JP 6135259B2 JP 2013079432 A JP2013079432 A JP 2013079432A JP 2013079432 A JP2013079432 A JP 2013079432A JP 6135259 B2 JP6135259 B2 JP 6135259B2
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- pneumatic tire
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- 229920001971 elastomer Polymers 0.000 title claims description 41
- 239000005060 rubber Substances 0.000 title claims description 41
- 239000000203 mixture Substances 0.000 title claims description 32
- 239000002184 metal Substances 0.000 claims description 19
- 229910052751 metal Inorganic materials 0.000 claims description 19
- 229920003244 diene elastomer Polymers 0.000 claims description 18
- 230000003014 reinforcing effect Effects 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 14
- 150000001868 cobalt Chemical class 0.000 claims description 13
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical group [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 8
- 244000043261 Hevea brasiliensis Species 0.000 claims description 7
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 7
- 239000002905 metal composite material Substances 0.000 claims description 7
- 229920003052 natural elastomer Polymers 0.000 claims description 7
- 229920001194 natural rubber Polymers 0.000 claims description 7
- 239000011593 sulfur Substances 0.000 claims description 7
- 229910052717 sulfur Inorganic materials 0.000 claims description 7
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 claims description 4
- 239000000176 sodium gluconate Substances 0.000 claims description 4
- 229940005574 sodium gluconate Drugs 0.000 claims description 4
- 235000012207 sodium gluconate Nutrition 0.000 claims description 4
- ZGTMUACCHSMWAC-UHFFFAOYSA-L EDTA disodium salt (anhydrous) Chemical compound [Na+].[Na+].OC(=O)CN(CC([O-])=O)CCN(CC(O)=O)CC([O-])=O ZGTMUACCHSMWAC-UHFFFAOYSA-L 0.000 claims description 3
- 229940037001 sodium edetate Drugs 0.000 claims description 3
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 14
- RGHNJXZEOKUKBD-SQOUGZDYSA-M D-gluconate Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O RGHNJXZEOKUKBD-SQOUGZDYSA-M 0.000 description 11
- 229940009662 edetate Drugs 0.000 description 11
- 229940050410 gluconate Drugs 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 9
- 238000004073 vulcanization Methods 0.000 description 9
- 230000032683 aging Effects 0.000 description 8
- 229910017052 cobalt Inorganic materials 0.000 description 7
- 239000010941 cobalt Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 230000007774 longterm Effects 0.000 description 5
- 230000020169 heat generation Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 239000011324 bead Substances 0.000 description 3
- -1 organic acid cobalt salt Chemical class 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000004636 vulcanized rubber Substances 0.000 description 3
- 239000011787 zinc oxide Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 229920002943 EPDM rubber Polymers 0.000 description 2
- 239000005062 Polybutadiene Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- AMFIJXSMYBKJQV-UHFFFAOYSA-L cobalt(2+);octadecanoate Chemical compound [Co+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O AMFIJXSMYBKJQV-UHFFFAOYSA-L 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 229960001484 edetic acid Drugs 0.000 description 2
- 229920003049 isoprene rubber Polymers 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 229920002857 polybutadiene Polymers 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- OHHLQFCWNFSQEY-UHFFFAOYSA-N O.O.O.O.[Na].[Na].[Na].[Na].OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O Chemical compound O.O.O.O.[Na].[Na].[Na].[Na].OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O OHHLQFCWNFSQEY-UHFFFAOYSA-N 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 125000005370 alkoxysilyl group Chemical group 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- IIGAELMXVLEZPM-GRVYQHKQSA-L cobalt(2+);(9z,12z)-octadeca-9,12-dienoate Chemical compound [Co+2].CCCCC\C=C/C\C=C/CCCCCCCC([O-])=O.CCCCC\C=C/C\C=C/CCCCCCCC([O-])=O IIGAELMXVLEZPM-GRVYQHKQSA-L 0.000 description 1
- LHEFLUZWISWYSQ-CVBJKYQLSA-L cobalt(2+);(z)-octadec-9-enoate Chemical compound [Co+2].CCCCCCCC\C=C/CCCCCCCC([O-])=O.CCCCCCCC\C=C/CCCCCCCC([O-])=O LHEFLUZWISWYSQ-CVBJKYQLSA-L 0.000 description 1
- KDMCQAXHWIEEDE-UHFFFAOYSA-L cobalt(2+);7,7-dimethyloctanoate Chemical compound [Co+2].CC(C)(C)CCCCCC([O-])=O.CC(C)(C)CCCCCC([O-])=O KDMCQAXHWIEEDE-UHFFFAOYSA-L 0.000 description 1
- SSWSYWBRGQINON-UHFFFAOYSA-L cobalt(2+);hexadecanoate Chemical compound [Co+2].CCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCC([O-])=O SSWSYWBRGQINON-UHFFFAOYSA-L 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- DTOSIQBPPRVQHS-PDBXOOCHSA-M linolenate Chemical compound CC\C=C/C\C=C/C\C=C/CCCCCCCC([O-])=O DTOSIQBPPRVQHS-PDBXOOCHSA-M 0.000 description 1
- 229940040452 linolenate Drugs 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- GEMHFKXPOCTAIP-UHFFFAOYSA-N n,n-dimethyl-n'-phenylcarbamimidoyl chloride Chemical compound CN(C)C(Cl)=NC1=CC=CC=C1 GEMHFKXPOCTAIP-UHFFFAOYSA-N 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 125000001181 organosilyl group Chemical group [SiH3]* 0.000 description 1
- 238000010525 oxidative degradation reaction Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 150000007519 polyprotic acids Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 239000003784 tall oil Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Tires In General (AREA)
Description
本発明は、ゴム組成物およびそれを用いた空気入りタイヤに関するものであり、詳しくは、金属製補強コードに対する初期および老化後の接着性を改善し、硬度および発熱性に優れ、長期間の使用における耐久性に優れたゴム組成物およびそれを用いた空気入りタイヤに関するものである。 The present invention relates to a rubber composition and a pneumatic tire using the rubber composition, and more specifically, improves initial and post-aging adhesion to a metal reinforcing cord, is excellent in hardness and heat generation, and is used for a long period of time. The present invention relates to a rubber composition excellent in durability and a pneumatic tire using the same.
一般に空気入りタイヤにおいて、カーカス層、ベルト層、ビードコアは、ゴム中に金属製補強コードを埋設させてなるゴム−金属複合材から構成されている。金属製補強コードを被覆するゴム組成物は、例えば昨今のタイヤの再利用化や長期利用化に鑑み、両者間で初期接着性が優れていること、長期使用後の耐水接着性が優れていること、高い硬度を有すること、発熱性に優れること、が求められている。
このため、従来、ゴム組成物に有機酸コバルト塩を配合することによって、ゴム−金属間で接着性を高める技術が知られている。しかしこのような従来技術では、湿熱下に長時間さらされるとゴム−金属間の接着性が低下するという問題点があった。
In general, in a pneumatic tire, a carcass layer, a belt layer, and a bead core are made of a rubber-metal composite material in which a metal reinforcing cord is embedded in rubber. The rubber composition covering the metal reinforcing cord has excellent initial adhesiveness between them, for example, in view of the recent reuse and long-term use of tires, and excellent water-resistant adhesiveness after long-term use. In addition, there is a demand for having high hardness and exothermic properties.
For this reason, conventionally, a technique for improving the adhesion between rubber and metal by blending an organic acid cobalt salt with a rubber composition is known. However, such a conventional technique has a problem in that the adhesion between the rubber and the metal is lowered when exposed to wet heat for a long time.
なお下記特許文献１には、エポキシ化天然ゴム、硫黄、ヒドロキシカルボン酸金属塩または多塩基酸金属塩を含有するタイヤ用ゴム組成物が開示されている。
しかしながら特許文献１には、コバルト塩を配合することによる老化後の接着性低下の問題点を何ら認識しておらず、かつ、下記で説明する本発明の構成、すなわちジエン系ゴムにコバルト塩の特定量およびエデト酸塩および／またはグルコン酸塩の特定量を配合し、前記コバルト塩の配合による問題点を解決しようとする技術思想は何ら開示または示唆されていない。
Patent Document 1 below discloses a tire rubber composition containing epoxidized natural rubber, sulfur, hydroxycarboxylic acid metal salt or polybasic acid metal salt.
However, Patent Document 1 does not recognize any problem of adhesive deterioration after aging due to the incorporation of a cobalt salt, and the configuration of the present invention described below, that is, the diene rubber contains a cobalt salt. There is no disclosure or suggestion of a technical idea for blending a specific amount and a specific amount of edetate and / or gluconate to solve the problems caused by the blending of the cobalt salt.
本発明の目的は、金属製補強コードに対する初期および老化後の接着性を改善し、硬度および発熱性に優れ、長期間の使用における耐久性に優れたゴム組成物およびそれを用いた空気入りタイヤを提供することにある。 An object of the present invention is to improve an initial and aging adhesion to a metal reinforcing cord, a rubber composition excellent in hardness and heat generation, and excellent in durability for long-term use, and a pneumatic tire using the rubber composition Is to provide.
本発明者らは鋭意研究を重ねた結果、ジエン系ゴムにコバルト塩の特定量およびエデト酸塩および／またはグルコン酸塩の特定量を配合することにより、上記課題を解決できることを見出し、本発明を完成することができた。
すなわち本発明は以下のとおりである。
As a result of intensive studies, the present inventors have found that the above problem can be solved by blending a specific amount of cobalt salt and a specific amount of edetate and / or gluconate with diene rubber. Was able to be completed.
That is, the present invention is as follows.
１．ジエン系ゴム１００質量部に対し、コバルト塩を０．１〜１０質量部、エデト酸ナトリウムおよびグルコン酸ナトリウムから選択された少なくとも１種を前記コバルト塩に対し１〜８００モル％配合してなることを特徴とする金属製補強コード被覆用ゴム組成物。
２．前記ジエン系ゴムが天然ゴムからなることを特徴とする前記１に記載のゴム組成物。
３．ジエン系ゴム１００質量部に対し、さらに硫黄を４〜１０質量部配合してなることを特徴とする前記１または２のいずれかに記載のゴム組成物。
４．前記１〜３のいずれかに記載のゴム組成物に、金属製補強コードを埋設させてなるゴム−金属複合材。
５．前記４に記載のゴム−金属複合材を用いた空気入りタイヤ。
1. To diene rubber 100 parts by weight of 0.1 to 10 parts by weight of a cobalt salt, that by blending 1 to 800 mol% relative to the cobalt salt of at least one selected from sodium edetate and sodium gluconate A rubber composition for covering a metal reinforcing cord .
2. 2. The rubber composition as described in 1 above, wherein the diene rubber is natural rubber.
3 . 4. The rubber composition according to any one of 1 or 2 above, wherein 4 to 10 parts by mass of sulfur is further blended with 100 parts by mass of the diene rubber.
4 . A rubber-metal composite material obtained by embedding a metal reinforcing cord in the rubber composition according to any one of 1 to 3 above.
5 . 5. A pneumatic tire using the rubber-metal composite material described in 4 above.
本発明によれば、ジエン系ゴムにコバルト塩の特定量およびエデト酸塩および／またはグルコン酸塩の特定量を配合したので、金属製補強コードに対する初期および老化後の接着性を改善し、硬度および発熱性に優れ、長期間の使用における耐久性に優れたゴム組成物およびそれを用いた空気入りタイヤを提供することができる。 According to the present invention, since a specific amount of cobalt salt and a specific amount of edetate and / or gluconate are blended in the diene rubber, the initial and aging adhesion to the metal reinforcing cord is improved, and the hardness In addition, it is possible to provide a rubber composition excellent in heat generation and durability in long-term use, and a pneumatic tire using the rubber composition.
以下、本発明をさらに詳細に説明する。 Hereinafter, the present invention will be described in more detail.
（ジエン系ゴム）
本発明で使用されるジエン系ゴムは、ゴム組成物に配合することができる任意のジエン系ゴムを用いることができ、例えば、天然ゴム（ＮＲ）、イソプレンゴム（ＩＲ）、ブタジエンゴム（ＢＲ）、スチレン−ブタジエン共重合体ゴム（ＳＢＲ）、アクリロニトリル−ブタジエン共重合体ゴム（ＮＢＲ）、エチレン−プロピレン−ジエンターポリマー（ＥＰＤＭ）等が挙げられる。これらは、単独で用いてもよく、２種以上を併用してもよい。また、その分子量やミクロ構造はとくに制限されず、アミン、アミド、シリル、アルコキシシリル、カルボキシル、ヒドロキシル基等で末端変性されていても、エポキシ化されていてもよい。
これらのジエン系ゴムの中でも、本発明の効果の点からジエン系ゴムはＮＲがとくに好ましい。
(Diene rubber)
As the diene rubber used in the present invention, any diene rubber that can be blended in the rubber composition can be used, for example, natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR). Styrene-butadiene copolymer rubber (SBR), acrylonitrile-butadiene copolymer rubber (NBR), ethylene-propylene-diene terpolymer (EPDM), and the like. These may be used alone or in combination of two or more. The molecular weight and microstructure are not particularly limited, and may be terminally modified with an amine, amide, silyl, alkoxysilyl, carboxyl, hydroxyl group or the like, or may be epoxidized.
Among these diene rubbers, NR is particularly preferable as the diene rubber from the viewpoint of the effect of the present invention.
（コバルト塩）
本発明で使用されるコバルト塩は、例えば、ナフテン酸コバルト、ステアリン酸コバルト、オレイン酸コバルト、リノール酸コバルト、リノレイン酸コバルト、パルミチン酸コバルト、ネオデカン酸コバルト、ロジン酸コバルト、トール油酸コバルト、ホウ酸三ネオデカン酸コバルト等の有機酸コバルト塩が挙げられる。
(Cobalt salt)
The cobalt salts used in the present invention include, for example, cobalt naphthenate, cobalt stearate, cobalt oleate, cobalt linoleate, cobalt linolenate, cobalt palmitate, cobalt neodecanoate, cobalt rosinate, cobalt tall oil, boron Examples include organic acid cobalt salts such as cobalt acid trineodecanoate.
（エデト酸塩およびグルコン酸塩）
本発明で使用されるエデト酸塩およびグルコン酸塩は、加硫後に遊離してくるコバルトと相互作用し、コバルトのゴムに対する酸化劣化作用を防止し、前記のような所望の効果が奏されるものであると推測される。
なお、エデト酸塩およびグルコン酸塩がナトリウム塩である場合、上記効果がさらに向上し好ましい。エデト酸はエチレンジアミン四酢酸、EDTAとも呼ばれ、水和物構造であっても構わない。
また、エデト酸塩およびグルコン酸塩は、単独で使用、併用のいずれでもよい。
(Edetate and gluconate)
The edetate and gluconate used in the present invention interacts with cobalt liberated after vulcanization, preventing the oxidative degradation of cobalt against rubber, and exhibiting the desired effects as described above. Presumed to be.
In addition, when the edetate and the gluconate are sodium salts, the above effect is further improved, which is preferable. Edetic acid is also called ethylenediaminetetraacetic acid or EDTA, and may have a hydrate structure.
Further, edetate and gluconate may be used alone or in combination.
（ゴム組成物の配合割合）
本発明のゴム組成物は、ジエン系ゴム１００質量部に対し、コバルト塩を０．１〜１０質量部、エデト酸塩およびグルコン酸塩から選択された少なくとも１種を前記コバルト塩に対し１〜８００モル％配合してなることを特徴とする。
前記コバルト塩の配合量が０．１質量部未満であると、配合量が少な過ぎて本発明の効果を奏することができない。逆に１０質量部を超えると破断特性や接着性が悪化する。
前記エデト酸塩およびグルコン酸塩から選択された少なくとも１種の配合量が１モル％未満であると、配合量が少な過ぎて本発明の効果を奏することができない。逆に８００モル％を超えると老化後の接着性が悪化する。
(Rubber composition ratio)
In the rubber composition of the present invention, 0.1 to 10 parts by mass of a cobalt salt, at least one selected from edetate and gluconate is added to 1 to 100 parts by mass of the diene rubber. It is characterized by blending 800 mol%.
When the amount of the cobalt salt is less than 0.1 parts by mass, the amount is too small to achieve the effects of the present invention. Conversely, when it exceeds 10 mass parts, a fracture | rupture characteristic and adhesiveness will deteriorate.
When the blending amount of at least one selected from the edetate and gluconate is less than 1 mol%, the blending amount is too small to achieve the effects of the present invention. Conversely, if it exceeds 800 mol%, the adhesiveness after aging deteriorates.
前記コバルト塩のさらに好ましい配合量は、ジエン系ゴム１００質量部に対し、０．５〜５質量部である。
前記エデト酸塩およびグルコン酸塩から選択された少なくとも１種のさらに好ましい配合量は、コバルト塩に対し５〜５００モル％である。
A more preferable blending amount of the cobalt salt is 0.5 to 5 parts by mass with respect to 100 parts by mass of the diene rubber.
A more preferable blending amount of at least one selected from the edetate and gluconate is 5 to 500 mol% based on the cobalt salt.
（その他成分）
本発明で使用されるゴム組成物には、前記した成分に加えて、加硫又は架橋剤；加硫又は架橋促進剤；酸化亜鉛、カーボンブラック、シリカ、クレー、タルク、炭酸カルシウムのような各種充填剤；各種オイル；老化防止剤；可塑剤などのゴム組成物に一般的に配合されている各種添加剤を配合することができ、かかる添加剤は一般的な方法で混練して組成物とし、加硫又は架橋するのに使用することができる。これらの添加剤の配合量も、本発明の目的に反しない限り、従来の一般的な配合量とすることができる。
なお、加硫剤として硫黄を使用する場合、本発明の効果の観点から、その配合量は、ジエン系ゴム１００質量部に対し、４〜１０質量部であるのが好ましい。
(Other ingredients)
The rubber composition used in the present invention includes, in addition to the above-described components, a vulcanization or crosslinking agent; a vulcanization or crosslinking accelerator; various types such as zinc oxide, carbon black, silica, clay, talc, and calcium carbonate. Various additives such as fillers, various oils, anti-aging agents, plasticizers and the like generally blended in rubber compositions can be blended, and these additives are kneaded by a general method to form a composition. Can be used for vulcanization or crosslinking. The blending amounts of these additives can be set to conventional general blending amounts as long as the object of the present invention is not violated.
In addition, when using sulfur as a vulcanizing agent, it is preferable that the compounding quantity is 4-10 mass parts with respect to 100 mass parts of diene rubbers from a viewpoint of the effect of this invention.
本発明に使用される金属製補強コードとしては、例えば、ベルトコンベアー、ホース、タイヤ等に一般的に使用される金属製補強コードが挙げられる。例えば、タイヤ用途の場合、金属製補強コードは、アンダートレッドに埋設されるベルト、カーカス、ビード（ビードコアおよびそれに収納されるスチールコードを含む）が挙げられる。また、金属製補強コードは、ブラスめっきされているのが好ましい。 Examples of the metal reinforcing cord used in the present invention include metal reinforcing cords generally used for belt conveyors, hoses, tires and the like. For example, in the case of a tire application, examples of the metal reinforcing cord include a belt, a carcass, and a bead (including a bead core and a steel cord accommodated therein) embedded in an under tread. Moreover, it is preferable that the metal reinforcing cord is brass-plated.
本発明のゴム−金属複合材は、例えば、前記の各種成分をバンバリーミキサーやロールミキサーなどの汎用の混合機を用いて混合しゴム組成物を調製し、これに金属製補強コードを埋設させ、常法にしたがって例えば加硫することにより、得ることができる。 The rubber-metal composite material of the present invention is prepared, for example, by mixing the above-mentioned various components using a general-purpose mixer such as a Banbury mixer or a roll mixer to prepare a rubber composition, in which a metal reinforcing cord is embedded, For example, it can be obtained by vulcanization according to a conventional method.
本発明のゴム−金属複合材の用途としては、ベルトコンベアー、ホース、タイヤ等が挙げられるが、とくにタイヤ用途が好ましい。タイヤ用途に使用する場合、その製造方法はとくに制限されず、公知技術にしたがい、空気入りタイヤを製造することができる。 Applications of the rubber-metal composite material of the present invention include belt conveyors, hoses, tires and the like, and tire applications are particularly preferable. When used for tire applications, the production method is not particularly limited, and a pneumatic tire can be produced according to a known technique.
以下、本発明を実施例および比較例によりさらに説明するが、本発明は下記例に制限されるものではない。 EXAMPLES Hereinafter, although an Example and a comparative example further demonstrate this invention, this invention is not restrict | limited to the following example.
実施例１〜８および比較例１〜２
サンプルの調製
表１に示す配合（質量部）において、加硫促進剤と硫黄を除く成分を１．７リットルの密閉式バンバリーミキサーで５分間混練した後、約１５０℃でミキサー外に放出させて室温冷却した。続いて、該組成物に加硫促進剤および硫黄を加えてオープンロールにて混練し、ゴム組成物を得た。次に得られたゴム組成物を所定の金型中で１７０℃、１０分間プレス加硫して加硫ゴム試験片を得、以下に示す試験法で加硫ゴム試験片の物性を測定した。
Examples 1-8 and Comparative Examples 1-2
Sample Preparation In the formulation (parts by mass) shown in Table 1, the components other than the vulcanization accelerator and sulfur were kneaded for 5 minutes in a 1.7 liter closed Banbury mixer, and then released outside the mixer at about 150 ° C. Cooled to room temperature. Subsequently, a vulcanization accelerator and sulfur were added to the composition and kneaded with an open roll to obtain a rubber composition. Next, the obtained rubber composition was press vulcanized in a predetermined mold at 170 ° C. for 10 minutes to obtain a vulcanized rubber test piece, and the physical properties of the vulcanized rubber test piece were measured by the following test method.
硬度：上記加硫ゴム試験片を用い、ＪＩＳ Ｋ６２５３に準拠して２０℃のショアＡ硬度を測定した。結果は比較例１の値を１００として指数表示し、この数字が高いほど硬度が高く良好な結果といえる。
発熱性：（株）東洋精機製作所製の粘弾性スペクトロメーターを用いて、初期歪＝１０％、振幅＝±２％、周波数＝２０Ｈｚの条件下でｔａｎδ（６０℃）を測定し、この値をもって発熱性を評価した。結果は、比較例１の値を１００として指数で示した。指数が小さいほど、低発熱性であることを示す。
初期接着性試験：ＡＳＴＭ Ｄ−２２２９に準拠して試験を行なった。１２．７mm間隔で平行に並べたブラスめっきスチールコードを上記ゴム組成物で被覆すると共に、埋め込み長さ１２．７mmで埋め込み、１７０℃×１０分間の加硫条件で加硫接着して接着サンプルを作製した。この接着サンプルからスチールコードを引き抜き、引抜力と、その表面を被覆するゴム付着量（％）により評価した。結果は比較例１の値を１００として指数表示した。この値が大きいほどゴムに対する接着性が優れている。
熱老化後接着性試験：上記の加硫後の接着サンプルを温度８０℃、９６時間の条件下におき、老化させた。このサンプルを上記の未老化接着性能試験と同様にして、引抜力とゴム付着量（％）を測定し、評価した。結果は比較例１の値を１００として指数表示した。この値が大きいほどゴムに対する接着性が優れている。
湿熱老化後接着性試験：上記の加硫後の接着サンプルを温度７０℃、相対湿度９６％、２週間の条件下におき、老化させた。このサンプルを上記の未老化接着性能試験と同様にして、引抜力とゴム付着量（％）を測定し、評価した。結果は比較例１の値を１００として指数表示した。この値が大きいほどゴムに対する接着性が優れている。
結果を表１に併せて示す。
Hardness: Shore A hardness at 20 ° C. was measured according to JIS K6253 using the above vulcanized rubber test piece. The result is expressed as an index with the value of Comparative Example 1 being 100, and the higher this number, the higher the hardness and the better the result.
Exothermic property: Using a viscoelastic spectrometer manufactured by Toyo Seiki Seisakusho Co., Ltd., tan δ (60 ° C.) was measured under the conditions of initial strain = 10%, amplitude = ± 2%, frequency = 20 Hz. Exotherm was evaluated. The results are shown as an index with the value of Comparative Example 1 being 100. A smaller index indicates a lower exothermic property.
Initial adhesion test: A test was performed in accordance with ASTM D-2229. A brass-plated steel cord arranged in parallel at 12.7 mm intervals is coated with the rubber composition, embedded in an embedding length of 12.7 mm, and vulcanized and bonded under vulcanization conditions of 170 ° C. × 10 minutes to form an adhesive sample. Produced. The steel cord was pulled out from this adhesion sample, and evaluated by the pulling force and the amount of rubber adhered (%) covering the surface. The result was expressed as an index with the value of Comparative Example 1 as 100. The larger this value, the better the adhesion to rubber.
Adhesion test after heat aging: The above vulcanized adhesion sample was aged by placing it at a temperature of 80 ° C. for 96 hours. This sample was evaluated in the same manner as the above-mentioned unaged adhesion performance test by measuring the pulling force and the rubber adhesion amount (%). The result was expressed as an index with the value of Comparative Example 1 as 100. The larger this value, the better the adhesion to rubber.
Adhesion test after wet heat aging: The above vulcanized adhesive sample was aged by placing it at a temperature of 70 ° C. and a relative humidity of 96% for 2 weeks. This sample was evaluated in the same manner as the above-mentioned unaged adhesion performance test by measuring the pulling force and the rubber adhesion amount (%). The result was expressed as an index with the value of Comparative Example 1 as 100. The larger this value, the better the adhesion to rubber.
The results are also shown in Table 1.
＊１：ＮＲ（ＲＳＳ＃３）
＊２：カーボンブラック（東海カーボン（株）製シーストＫＨ）
＊３：酸化亜鉛（正同化学工業（株）製酸化亜鉛３種）
＊４：ステアリン酸コバルト（ＤＩＣ（株）製）
＊５：硫黄（アクゾノーベル（株）製クリステックスＨＴ ＯＴ ２０）
＊６：加硫促進剤（大内新興化学工業（株）製ノクセラーＤＺ）
＊７：エデト酸ナトリウム水和物（エチレンジアミン四酢酸四ナトリウム四水和物）（関東化学（株）製）
＊８：グルコン酸ナトリウム（関東化学（株）製）
* 1: NR (RSS # 3)
* 2: Carbon black (Toast Carbon Co., Ltd. Seast KH)
* 3: Zinc oxide (3 types of zinc oxide manufactured by Shodo Chemical Industry Co., Ltd.)
* 4: Cobalt stearate (manufactured by DIC Corporation)
* 5: Sulfur (Akzo Nobel Kristex HT OT 20)
* 6: Vulcanization accelerator (Ouchi Shinsei Chemical Co., Ltd. Noxeller DZ)
* 7: Sodium edetate hydrate (ethylenediaminetetraacetic acid tetrasodium tetrahydrate) (manufactured by Kanto Chemical Co., Inc.)
* 8: Sodium gluconate (manufactured by Kanto Chemical Co., Inc.)
上記の表１から明らかなように、実施例で調製されたゴム組成物は、ジエン系ゴムにコバルト塩の特定量およびエデト酸塩および／またはグルコン酸塩の特定量を配合したので、従来の代表的な比較例１に比べて、金属製補強コードに対する初期および老化後の接着性を改善し、硬度および発熱性に優れ、長期間の使用における耐久性に優れることが証明された。
これに対し、比較例２は、グルコン酸ナトリウムの配合量が本発明で規定する上限を超えているので、初期および老化後の接着性が改善しなかった。
As apparent from Table 1 above, the rubber compositions prepared in the examples were blended with a specific amount of cobalt salt and a specific amount of edetate and / or gluconate in the diene rubber, Compared to representative Comparative Example 1, it was proved that the initial and aging adhesion to a metal reinforcing cord was improved, the hardness and heat generation were excellent, and the durability in long-term use was excellent.
On the other hand, since the compounding quantity of the sodium gluconate exceeded the upper limit prescribed | regulated by this invention in the comparative example 2, the adhesiveness in the initial stage and after aging did not improve.
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