JP2020075984A - Rubber composition for tire side wall - Google Patents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
Description
本発明は、タイヤサイドウォール用ゴム組成物に関し、特にゴム特有の臭気が少なく、耐疲労性能に優れた空気入りタイヤの原料となるゴム組成物に関する。 TECHNICAL FIELD The present invention relates to a rubber composition for tire sidewalls, and more particularly to a rubber composition that is a raw material for a pneumatic tire that has little odor peculiar to rubber and is excellent in fatigue resistance.
一般に、タイヤは様々な走行環境で使用され、特にサイドウォール部材は走行時に荷重が掛かった状態で繰り返し振動を受けるため、耐疲労性能に優れることが要求される。かかるサイドウォール部材の大部分を占めるゴム部材は一般に特有の臭気を有しており、市場においてはゴム特有の臭気の低減が要求されている。 In general, tires are used in various traveling environments, and particularly, sidewall members are repeatedly subjected to vibration under a load applied during traveling, and therefore are required to have excellent fatigue resistance. The rubber member which occupies most of the side wall member generally has a peculiar odor, and reduction of the odor peculiar to rubber is required in the market.
下記特許文献1では、天然ゴムラテックスおよび白色充填剤を混合し、得られた混合物を高純度化処理し、その後、凝固、乾燥させる工程を含む天然ゴム−白色充填剤複合体の製造方法が記載されている。 Patent Document 1 below describes a method for producing a natural rubber-white filler composite including a step of mixing a natural rubber latex and a white filler, subjecting the obtained mixture to a purification treatment, and then coagulating and drying the mixture. Has been done.
また、下記特許文献2では、ジエン系ゴム100重量部に対し、無機充填剤を5〜130重量部、カテキンを含む茶抽出物を0.01〜10重量部配合したタイヤ用ゴム組成物が記載されている。 Further, in Patent Document 2 below, a rubber composition for a tire is described in which 5 to 130 parts by weight of an inorganic filler and 0.01 to 10 parts by weight of a tea extract containing catechin are mixed with 100 parts by weight of a diene rubber. Has been done.
また、下記特許文献3では、充填材含有ゴムラテックス溶液にタンニンを添加し、凝固させた後、乾燥する工程を含むゴムウエットマスターバッチの製造方法が記載されている。 In addition, Patent Document 3 below describes a method for producing a rubber wet masterbatch, which includes a step of adding tannin to a rubber latex solution containing a filler, solidifying and then drying.
さらに、下記特許文献4では、柿の搾汁液に水を投入して撹拌した混合溶液を得た後に、炭酸ナトリウム水溶液を添加してpH値を8.5〜9.0に調整することを特徴とする硫黄系悪臭に対する消臭剤の製造方法記載されている。 Furthermore, in Patent Document 4 below, after adding water to the persimmon juice and stirring it to obtain a mixed solution, an aqueous sodium carbonate solution is added to adjust the pH value to 8.5 to 9.0. And a method for producing a deodorant against a sulfur-based malodor.
ただし、本発明者が鋭意検討したところ、上記特許文献1〜3に記載の技術では、ゴム特有の臭気を低減しつつ、かつ耐疲労性能を向上させた空気入りタイヤを提供することは困難なことが判明した。なお、上記特許文献4は消臭剤に係る技術を記載するものであり、空気入りタイヤ(ゴム)特有の臭気については何ら問題としておらず、ましてや空気入りタイヤの諸性能の向上については全く記載も示唆もない。 However, as a result of diligent study by the present inventor, it is difficult to provide a pneumatic tire having improved fatigue resistance while reducing the odor peculiar to rubber with the techniques described in Patent Documents 1 to 3 above. It has been found. In addition, the said patent document 4 describes the technology regarding a deodorant, it does not have any problem about the odor peculiar to a pneumatic tire (rubber), let alone the improvement of various performances of a pneumatic tire. There is no suggestion.
本発明は上記実情に鑑みてなされたものであり、その目的は、ゴム特有の臭気を低減しつつ、かつ耐疲労性能を向上させた空気入りタイヤの原料となるタイヤサイドウォール用ゴム組成物を提供することにある。 The present invention has been made in view of the above circumstances, and an object thereof is to reduce the odor peculiar to rubber, and to provide a rubber composition for a tire sidewall, which is a raw material for a pneumatic tire having improved fatigue resistance. To provide.
上記課題は下記構成により解決可能である。すなわち本発明は、ゴム成分全量を100質量部としたとき、柿抽出物と炭酸ナトリウムとを含む複合粉末を1.0〜10質量部含有することを特徴とするタイヤサイドウォール用ゴム組成物に関する。 The above problem can be solved by the following configuration. That is, the present invention relates to a rubber composition for a tire sidewall, which contains 1.0 to 10 parts by mass of a composite powder containing a persimmon extract and sodium carbonate when the total amount of the rubber component is 100 parts by mass. .
本発明に係るゴム組成物は、柿抽出物と炭酸ナトリウムとを含む複合粉末を含有するため、最終的に空気入りタイヤとしたとき、(1)ゴム特有の臭気の低減と、(2)耐疲労性能の向上と、を両立することができる。これらの効果が得られる理由は明らかではないが、例えば下記の如く推定可能である。
(1)少なくとも柿の抽出物と炭酸ナトリウムとを複合化し、粉末化することにより、柿の抽出物中に含まれる縮合型タンニンが部分的に酸化され、分子中に縮合型タンニンが本来有する還元能に加えて、酸化能を付加することができる。これにより、酸化反応により消臭される成分と還元反応により消臭される成分の両方に対して消臭効果を発揮することが可能となる。よって、この部分的に酸化された縮合型タンニンとゴム中に含まれる窒素化合物、硫黄化合物や低級脂肪酸などの臭気成分とが化学的に反応することにより、ゴム特有の臭気が低減できる。
(2)柿の抽出物中に含まれる縮合型タンニンは、分子中に多数のフェノール水酸基を有しており、これが、荷重が掛かった状態で繰り返し振動を受けたゴム中で生成するラジカルを補足する。その結果、サイドウォールのゴム部材の劣化を抑制し、耐疲労性能を向上することができる。
Since the rubber composition according to the present invention contains a composite powder containing a persimmon extract and sodium carbonate, when the final pneumatic tire is obtained, (1) reduction of odor peculiar to rubber and (2) resistance to It is possible to achieve both improvement in fatigue performance. The reason why these effects are obtained is not clear, but can be estimated as follows, for example.
(1) At least the condensed tannin contained in the persimmon extract is partially oxidized by complexing at least the persimmon extract and sodium carbonate and pulverizing, and the reduction originally possessed by the condensed tannin in the molecule. In addition to the ability, an oxidizing ability can be added. This makes it possible to exert a deodorizing effect on both the components deodorized by the oxidation reaction and the components deodorized by the reduction reaction. Therefore, the odor peculiar to rubber can be reduced by chemically reacting the partially oxidized condensed tannin with the odor components such as nitrogen compounds, sulfur compounds and lower fatty acids contained in the rubber.
(2) The condensed tannin contained in the extract of persimmon has a large number of phenolic hydroxyl groups in the molecule, which complements the radicals generated in rubber that is repeatedly vibrated under a load. To do. As a result, it is possible to suppress deterioration of the rubber member of the sidewall and improve fatigue resistance.
なお、本発明においては、ゴム成分全量を100質量部としたとき、かかる複合粉末の配合量を1.0〜10質量部に設定することにより、ゴム特有の臭気の低減と耐疲労性能の向上とを両立することができる。特に、かかる配合量を10質量部以下に設定することにより、さらにゴム組成物の加硫速度を安定化することができる。 In the present invention, when the total amount of the rubber component is 100 parts by mass, the compounded amount of the composite powder is set to 1.0 to 10 parts by mass to reduce the odor peculiar to rubber and improve fatigue resistance. Can be compatible with both. In particular, the vulcanization rate of the rubber composition can be further stabilized by setting the blending amount to 10 parts by mass or less.
上記タイヤサイドウォール用ゴム組成物において、前記複合粉末中、前記柿抽出物と前記炭酸ナトリウムとの質量比率が1:1〜5:1であることが好ましい。また、上記タイヤサイドウォール用ゴム組成物において、ゴム成分全量を100質量部としたとき、前記複合粉末中の前記柿抽出物の有効成分量が0.01〜8.0質量部であることが好ましい。かかる構成によれば、特にゴム特有の臭気をより低減できるため好ましい。 In the above rubber composition for tire sidewall, it is preferable that a mass ratio of the persimmon extract and the sodium carbonate in the composite powder is 1: 1 to 5: 1. Further, in the above rubber composition for tire sidewall, when the total amount of the rubber component is 100 parts by mass, the amount of the active ingredient of the persimmon extract in the composite powder is 0.01 to 8.0 parts by mass. preferable. According to this structure, the odor peculiar to rubber can be further reduced, which is preferable.
本発明に係るタイヤサイドウォール用ゴム組成物は、ゴム成分、および柿抽出物と炭酸ナトリウムとを含む複合粉末を少なくとも必須成分として含有する。 The rubber composition for a tire sidewall according to the present invention contains a rubber component and a composite powder containing a persimmon extract and sodium carbonate as at least essential components.
本発明に係るタイヤサイドウォール用ゴム組成物は、好適にはゴム成分としてジエン系ゴムを含有する。ジエン系ゴムとしては、例えば、天然ゴム(NR)、ポリイソプレンゴム(IR)、ポリブタジエン(BR)、ポリスチレンブタジエンゴム(SBR)、クロロプレンゴム(CR)、ニトリルゴム(NBR)などが挙げられる。 The rubber composition for a tire sidewall according to the present invention preferably contains a diene rubber as a rubber component. Examples of the diene rubber include natural rubber (NR), polyisoprene rubber (IR), polybutadiene (BR), polystyrene butadiene rubber (SBR), chloroprene rubber (CR), nitrile rubber (NBR) and the like.
複合粉末は、少なくとも柿抽出物と炭酸ナトリウムとを必須成分として含有する。柿抽出物はポリフェノールの一種である縮合型タンニンを含み、この縮合型タンニンは多くのフェノール性水酸基(−OH基)を有し、これがゴム中に含まれる各種悪臭成分と化学的に結合して、消臭効果を発揮する。特に、縮合型タンニンが炭酸ナトリウムと複合化され、部分的に酸化されることにより、ゴム特有の臭気を高いレベルで低減できる。複合粉末は、柿抽出物と炭酸ナトリウムとを必須成分とし、例えばトレハロースや、セルロースなどの水溶性高分子を含有してもよい。 The composite powder contains at least a persimmon extract and sodium carbonate as essential components. The persimmon extract contains condensed tannin which is a kind of polyphenol, and this condensed tannin has many phenolic hydroxyl groups (-OH groups), which are chemically bonded to various malodorous components contained in rubber. , Deodorizing effect. In particular, the condensed tannin is complexed with sodium carbonate and partially oxidized, so that the odor peculiar to rubber can be reduced at a high level. The composite powder contains persimmon extract and sodium carbonate as essential components, and may contain a water-soluble polymer such as trehalose or cellulose.
ゴム特有の臭気の低減と耐疲労性能の向上とをバランスよく両立するためには、ゴム成分全量を100質量部としたとき、かかる複合粉末の配合量は1.0〜10質量部とすることが好ましく、3.0〜8.0質量部とすることがより好ましい。 In order to achieve a good balance between the reduction of odor peculiar to rubber and the improvement of fatigue resistance, the compounding amount of the composite powder should be 1.0 to 10 parts by mass when the total amount of rubber components is 100 parts by mass. Is preferable, and it is more preferable to set it as 3.0-8.0 mass parts.
また、ゴム特有の臭気の低減と耐疲労性能の向上とをバランスよく両立するためには、複合粉末中、柿抽出物と炭酸ナトリウムとの質量比率が1:1〜5:1であることが好ましく、2:1〜4:1であることがより好ましい。また、上記空気入りタイヤ用ゴム組成物において、ゴム成分全量を100質量部としたとき、複合粉末中の柿抽出物の有効成分量が0.01〜8.0質量部であることが好ましく、0.3〜5.0質量部であることがより好ましい。なお、複合粉末中の炭酸ナトリウムの含有量は、前記した複合粉末中の柿抽出物の有効成分量、および柿抽出物と炭酸ナトリウムとの質量比率の両方を満たすものであれば特に限定されない。 In order to achieve a good balance between the reduction of odor peculiar to rubber and the improvement of fatigue resistance, the mass ratio of persimmon extract and sodium carbonate in the composite powder is 1: 1 to 5: 1. It is preferably 2: 1 to 4: 1 and more preferably. Further, in the rubber composition for a pneumatic tire, when the total amount of the rubber component is 100 parts by mass, the amount of the active ingredient of the persimmon extract in the composite powder is preferably 0.01 to 8.0 parts by mass, It is more preferably 0.3 to 5.0 parts by mass. The content of sodium carbonate in the composite powder is not particularly limited as long as it satisfies both the amount of the active ingredient of the persimmon extract in the composite powder and the mass ratio of the persimmon extract and sodium carbonate.
本発明に係るタイヤサイドウォール用ゴム組成物は、ゴム成分、および柿抽出物と炭酸ナトリウムとを含む複合粉末以外の成分として、当業者に公知の配合剤を配合可能であり、例えばカーボンブラック、シリカ、シランカップリング剤、加硫系配合剤、老化防止剤、酸化亜鉛、ステアリン酸、ワックス、やオイルなどの軟化剤、加工助剤などを配合することができる。 The rubber composition for a tire sidewall according to the present invention can be compounded with a compounding agent known to those skilled in the art as a component other than the rubber component, and the composite powder containing the persimmon extract and sodium carbonate, such as carbon black, Silica, a silane coupling agent, a vulcanizing compounding agent, an antioxidant, a zinc oxide, stearic acid, a softening agent such as wax and oil, a processing aid, and the like can be added.
カーボンブラックは、例えばSAF、ISAF、HAF、FEF、GPFなど、通常のゴム工業で使用されるカーボンブラックの他、アセチレンブラックやケッチェンブラックなどの導電性カーボンブラックを使用することができる。本発明に係る空気入りタイヤ用ゴム組成物は、ジエン系ゴム100質量部に対し、カーボンブラックを10〜120質量部配合することが好ましく、20〜100質量部であることがより好ましい。 As the carbon black, for example, conductive carbon black such as acetylene black or Ketjen black can be used in addition to carbon black used in a usual rubber industry such as SAF, ISAF, HAF, FEF and GPF. The rubber composition for a pneumatic tire according to the present invention preferably contains 10 to 120 parts by mass of carbon black, and more preferably 20 to 100 parts by mass, based on 100 parts by mass of the diene rubber.
シリカとしては、通常のゴム補強に用いられる湿式シリカ、乾式シリカ、ゾル−ゲルシリカ、表面処理シリカなどが用いられる。なかでも、湿式シリカが好ましい。 As silica, there are used wet silica, dry silica, sol-gel silica, surface-treated silica and the like which are commonly used for rubber reinforcement. Of these, wet silica is preferable.
シランカップリング剤としては、分子中に硫黄を含むものであれば特に限定されず、ゴム組成物においてシリカとともに配合される各種のシランカップリング剤を用いることができる。例えば、ビス(3−トリエトキシシリルプロピル)テトラスルフィド(例えば、デグサ社製「Si69」)、ビス(3−トリエトキシシリルプロピル)ジスルフィド(例えば、デグサ社製「Si75」)、ビス(2−トリエトキシシリルエチル)テトラスルフィド、ビス(4−トリエキトシシリルブチル)ジスルフィド、ビス(3−トリメトキシシリルプロピル)テトラスルフィド、ビス(2−トリメトキシシリルエチル)ジスルフィドなどのスルフィドシラン、γ−メルカプトプロピルトリメトキシシラン、γ−メルカプトプロピルトリエトキシシラン、メルカプトプロピルメチルジメトキシシラン、メルカプトプロピルジメチルメトキシシラン、メルカプトエチルトリエトキシシランなどのメルカプトシラン、3−オクタノイルチオ−1−プロピルトリエトキシシラン、3−プロピオニルチオプロピルトリメトキシシランなどの保護化メルカプトシランが挙げられる。 The silane coupling agent is not particularly limited as long as it contains sulfur in the molecule, and various silane coupling agents blended with silica in the rubber composition can be used. For example, bis (3-triethoxysilylpropyl) tetrasulfide (for example, "Si69" manufactured by Degussa), bis (3-triethoxysilylpropyl) disulfide (for example, "Si75" manufactured by Degussa), bis (2-tri Sulfidosilanes such as ethoxysilylethyl) tetrasulfide, bis (4-triethyloxysilylbutyl) disulfide, bis (3-trimethoxysilylpropyl) tetrasulfide, bis (2-trimethoxysilylethyl) disulfide, γ-mercaptopropyltrisulfide Mercaptosilanes such as methoxysilane, γ-mercaptopropyltriethoxysilane, mercaptopropylmethyldimethoxysilane, mercaptopropyldimethylmethoxysilane, and mercaptoethyltriethoxysilane, 3-octanoylthio-1-propyltriethoxysilane, 3-propionylthiopropyltriethoxysilane. Included are protected mercaptosilanes such as methoxysilane.
老化防止剤としては、ゴム用として通常用いられる、芳香族アミン系老化防止剤、アミン−ケトン系老化防止剤、モノフェノール系老化防止剤、ビスフェノール系老化防止剤、ポリフェノール系老化防止剤、ジチオカルバミン酸塩系老化防止剤、チオウレア系老化防止剤などの老化防止剤を単独、または適宜混合して使用しても良い。 As the anti-aging agent, usually used for rubber, aromatic amine anti-aging agent, amine-ketone anti-aging agent, monophenol anti-aging agent, bisphenol anti-aging agent, polyphenol anti-aging agent, dithiocarbamic acid Antiaging agents such as salt antiaging agents and thiourea antiaging agents may be used alone or in admixture.
加硫系配合剤としては、硫黄、有機過酸化物などの加硫剤、加硫促進剤、加硫促進助剤、加硫遅延剤などが挙げられる。 Examples of the vulcanizing compounding agent include vulcanizing agents such as sulfur and organic peroxides, vulcanization accelerators, vulcanization accelerating aids, vulcanization retarders and the like.
加硫系配合剤としての硫黄は通常のゴム用硫黄であればよく、例えば粉末硫黄、沈降硫黄、不溶性硫黄、高分散性硫黄などを用いることができる。 Sulfur as a vulcanizing compounding agent may be ordinary sulfur for rubber, and for example, powdered sulfur, precipitated sulfur, insoluble sulfur, highly dispersible sulfur and the like can be used.
加硫促進剤としては、ゴム加硫用として通常用いられる、スルフェンアミド系加硫促進剤、チウラム系加硫促進剤、チアゾール系加硫促進剤、チオウレア系加硫促進剤、グアニジン系加硫促進剤、ジチオカルバミン酸塩系加硫促進剤などの加硫促進剤を単独、または適宜混合して使用しても良い。 As the vulcanization accelerator, usually used for rubber vulcanization, sulfenamide-based vulcanization accelerator, thiuram-based vulcanization accelerator, thiazole-based vulcanization accelerator, thiourea-based vulcanization accelerator, guanidine-based vulcanization A vulcanization accelerator such as an accelerator or a dithiocarbamate vulcanization accelerator may be used alone or in an appropriate mixture.
本発明に係るゴム組成物は、ゴム成分、および柿抽出物と炭酸ナトリウムとを含む複合粉末、さらにはカーボンブラック、シリカ、シランカップリング剤、加硫系配合剤、老化防止剤、酸化亜鉛、ステアリン酸、ワックス、やオイルなどの軟化剤、加工助剤などを、バンバリーミキサー、ニーダー、ロールなどの通常のゴム工業において使用される混練機を用いて混練りすることにより得られる。 The rubber composition according to the present invention, a rubber component, and a composite powder containing a persimmon extract and sodium carbonate, further carbon black, silica, a silane coupling agent, a vulcanizing compounding agent, an antioxidant, zinc oxide, It can be obtained by kneading stearic acid, wax, a softening agent such as oil, a processing aid, and the like using a kneader such as a Banbury mixer, a kneader, or a roll used in a usual rubber industry.
また、上記各成分の配合方法は特に限定されず、硫黄系加硫剤、および加硫促進剤などの加硫系配合剤以外の配合成分を予め混練してマスターバッチとし、残りの成分を添加してさらに混練する方法、各成分を任意の順序で添加し混練する方法、全成分を同時に添加して混練する方法などのいずれでもよい。 In addition, the mixing method of each of the above components is not particularly limited, and a sulfur-based vulcanizing agent, and a compounding component other than a vulcanizing compounding agent such as a vulcanization accelerator are kneaded in advance to form a masterbatch, and the remaining components are added. And further kneading, a method of adding each component in an arbitrary order and kneading, a method of simultaneously adding all components and kneading, and the like.
以下、本発明の構成と効果を具体的に示す実施例などについて説明する。なお、実施例などにおける評価項目は、各ゴム組成物を160℃にて30分間加熱、加硫して得られたゴムサンプルを下記の評価条件に基づいて評価を行った。 Hereinafter, examples and the like specifically showing the configuration and effects of the present invention will be described. As for the evaluation items in the examples and the like, the rubber samples obtained by heating and vulcanizing each rubber composition at 160 ° C. for 30 minutes were evaluated based on the following evaluation conditions.
(1)ゴムの臭気評価
JIS Z9080に準拠し、臭気を官能評価した。6段階評価を行い、数値が高いほど、強く臭いを感じるため、臭気が低減できていないことを意味する。
(1) Odor evaluation of rubber Odor was sensory evaluated according to JIS Z9080. A six-level evaluation was performed. The higher the value, the more strongly the odor is felt, which means that the odor cannot be reduced.
(2)耐疲労性能
JIS K6260に準拠し、測定は23℃の条件下で行い、亀裂成長が2mmになるまでの回数を求め、比較例1の値を100とした指数で示した。指数が大きいほど、耐疲労性に優れることを意味する。
(2) Fatigue resistance performance According to JIS K6260, the measurement was performed under the condition of 23 ° C., the number of times until the crack growth reached 2 mm was determined, and the value was set as an index with the value of Comparative Example 1 as 100. The larger the index, the better the fatigue resistance.
(ゴム組成物の調製)
表1の配合処方に従い、実施例1〜3および比較例1〜5のゴム組成物を配合し、通常のバンバリーミキサーを用いて混練し、ゴム組成物を調整した。表1に記載の各配合剤を以下に示す(表1において、各配合剤の配合量を、ゴム成分100質量部に対する質量部数で示す)。
a)天然ゴム(NR):「RSS#3」
b)ブタジエンゴム(BR):「BR150B」宇部興産社製
c)カーボンブラック:「シーストSO」東海カーボン社製
d)ステアリン酸:「ビーズステアリン酸」日油社製
e)酸化亜鉛:「酸化亜鉛2種」三井金属鉱山社製
f)無機充填剤(A)(白色充填剤):「ノーベライトTT」日東粉化工業社製
g)無機充填剤(B)(炭酸ナトリウム):「炭酸ナトリウム」富士フィルム和光純薬社製
h)縮合型タンニン:「縮合型タンニン」川村通商社製
i)柿抽出物と炭酸ナトリウムとを含む複合粉末:「パンシルPS−M」リリース科学工業社製
j)老化防止剤:「ノクラック6C」大内振興化学工業社製
k)硫黄:「粉末硫黄」鶴見化学工業社製
l)加硫促進剤:「ソクシールCZ」住友化学社製
(Preparation of rubber composition)
According to the formulation of Table 1, the rubber compositions of Examples 1 to 3 and Comparative Examples 1 to 5 were blended and kneaded with a usual Banbury mixer to prepare rubber compositions. Each compounding agent shown in Table 1 is shown below (in Table 1, the compounding amount of each compounding agent is shown by the number of parts by mass relative to 100 parts by mass of the rubber component).
a) Natural rubber (NR): "RSS # 3"
b) Butadiene rubber (BR): "BR150B" manufactured by Ube Industries c) Carbon black: "Seast SO" manufactured by Tokai Carbon d) Stearic acid: "Bead stearic acid" manufactured by NOF Corporation e) Zinc oxide: "Zinc oxide" 2 types "Mitsui Mining & Smelting Company f) Inorganic filler (A) (white filler):" Nobelite TT "Nitto Koka Kogyo g) Inorganic filler (B) (sodium carbonate):" Sodium carbonate "Fuji Film Wako Pure Chemical Industries, Ltd. h) Condensed tannin: “Condensed tannin” Kawamura Tsusho i) Composite powder containing persimmon extract and sodium carbonate: “Pancil PS-M” Release Kagaku Kogyo j) Anti-aging Agent: "Nocrac 6C" manufactured by Ouchi Shinko Kagaku Kogyo Co., Ltd. k) Sulfur: "Powdered Sulfur" manufactured by Tsurumi Chemical Co., Ltd. l) Vulcanization accelerator: "Sokushiru CZ" manufactured by Sumitomo Chemical Co., Ltd.
表1の結果から、実施例1〜3に係るゴム組成物の加硫ゴムは、比較例1に係るゴム組成物の加硫ゴムに比して、臭気が低減されており、かつ耐疲労性能に優れることが分かる。 From the results of Table 1, the vulcanized rubbers of the rubber compositions according to Examples 1 to 3 have a reduced odor compared with the vulcanized rubbers of the rubber compositions according to Comparative Example 1, and have fatigue resistance performance. It turns out to be excellent.
Claims (3)
The rubber composition for a tire sidewall according to claim 1 or 2, wherein the total amount of the rubber component is 100 parts by mass, and the amount of the effective component of the persimmon extract in the composite powder is 0.01 to 8.0 parts by mass. object.
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