JP2007099874A - Tire rubber composition and pneumatic tire using it - Google Patents
Tire rubber composition and pneumatic tire using it Download PDFInfo
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- JP2007099874A JP2007099874A JP2005290433A JP2005290433A JP2007099874A JP 2007099874 A JP2007099874 A JP 2007099874A JP 2005290433 A JP2005290433 A JP 2005290433A JP 2005290433 A JP2005290433 A JP 2005290433A JP 2007099874 A JP2007099874 A JP 2007099874A
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 44
- 239000005060 rubber Substances 0.000 title claims abstract description 44
- 239000000203 mixture Substances 0.000 title claims abstract description 38
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000000945 filler Substances 0.000 claims abstract description 16
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 16
- 239000004927 clay Substances 0.000 claims abstract description 14
- 235000014113 dietary fatty acids Nutrition 0.000 claims abstract description 14
- 239000000194 fatty acid Substances 0.000 claims abstract description 14
- 229930195729 fatty acid Natural products 0.000 claims abstract description 14
- 239000000344 soap Substances 0.000 claims abstract description 14
- 150000004665 fatty acids Chemical class 0.000 claims abstract description 13
- 229910052751 metal Inorganic materials 0.000 claims abstract description 13
- 239000002184 metal Substances 0.000 claims abstract description 13
- 229920005555 halobutyl Polymers 0.000 claims abstract description 9
- 229920002943 EPDM rubber Polymers 0.000 claims abstract description 8
- 229920003244 diene elastomer Polymers 0.000 claims abstract description 8
- 150000001875 compounds Chemical class 0.000 claims description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims 1
- 239000010936 titanium Substances 0.000 claims 1
- 229910052719 titanium Inorganic materials 0.000 claims 1
- 238000002156 mixing Methods 0.000 description 11
- 238000004073 vulcanization Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- 244000043261 Hevea brasiliensis Species 0.000 description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 238000004898 kneading Methods 0.000 description 3
- 229920003052 natural elastomer Polymers 0.000 description 3
- 229920001194 natural rubber Polymers 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- 239000011701 zinc 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
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 2
- 239000004594 Masterbatch (MB) Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 235000021355 Stearic acid Nutrition 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- -1 butyl halide Chemical class 0.000 description 2
- 229920005549 butyl rubber Polymers 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000008117 stearic acid Substances 0.000 description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 239000004636 vulcanized rubber Substances 0.000 description 2
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- 101100434170 Oryza sativa subsp. japonica ACR2.1 gene Proteins 0.000 description 1
- 239000005662 Paraffin oil Substances 0.000 description 1
- 239000005062 Polybutadiene Substances 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- IRERQBUNZFJFGC-UHFFFAOYSA-L azure blue Chemical compound [Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[S-]S[S-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-] IRERQBUNZFJFGC-UHFFFAOYSA-L 0.000 description 1
- 238000005282 brightening Methods 0.000 description 1
- 229920005557 bromobutyl Polymers 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 229920005556 chlorobutyl Polymers 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000009661 fatigue test Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 229920001195 polyisoprene Polymers 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000010734 process oil Substances 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229920001897 terpolymer Polymers 0.000 description 1
- 150000004670 unsaturated fatty acids Chemical class 0.000 description 1
- 235000021122 unsaturated fatty acids Nutrition 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Landscapes
- Tires In General (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
本発明はタイヤ用ゴム組成物及びそれを用いた空気入りタイヤに関し、更に詳しくは比較的低コストの、白色感及び耐疲労性に優れたタイヤ用、特にタイヤホワイトサイド用に適したタイヤ用ゴム組成物及びそれをタイヤのホワイトサイドに用いた空気入りタイヤに関する。 TECHNICAL FIELD The present invention relates to a tire rubber composition and a pneumatic tire using the same, and more particularly, a tire rubber having a relatively low cost and excellent in whiteness and fatigue resistance, particularly suitable for tire white side. The present invention relates to a composition and a pneumatic tire using the composition on a white side of a tire.
従来のタイヤ用ホワイトコンパウンドは、例えば特許文献１に記載のように、白色感を上げる手段として、一般に二酸化チタン等の白色顔料が配合されており、白色度を高めるためにその配合量を増加させることが知られている。しかし、二酸化チタンの増量は混練り性を非常に悪くし、しかもコストも非常に高くなるという問題があった。また同時にサイドコンパウンドであるが故に耐疲労性も求められるため、粘度の高いポリマーやハロゲン化ブチルゴムの比率を増やしたりすることもあるが、これも混練り性の悪化を招くという問題があった。このように従来技術においては十分な白色感と耐疲労性、加工性、コストのバランスをとることが非常に難しかった。更に、サイドコンパウンドの明度（白色度）を向上させるために、ゴム組成物中に螢光増白剤を配合することも提案されている（特許文献２参照）。 Conventional tire white compounds, as described in Patent Document 1, for example, are generally blended with white pigments such as titanium dioxide as a means to increase whiteness, and increase the blending amount to increase whiteness. It is known. However, the increase in the amount of titanium dioxide has a problem that the kneading property is very poor and the cost is very high. At the same time, since it is a side compound, fatigue resistance is also required, so that the ratio of a polymer having a high viscosity or a halogenated butyl rubber may be increased, but this also has a problem that the kneading property is deteriorated. As described above, in the prior art, it is very difficult to balance a sufficient white feeling with fatigue resistance, workability, and cost. Furthermore, in order to improve the brightness (whiteness) of the side compound, it has also been proposed to blend a brightening agent in the rubber composition (see Patent Document 2).
従って、本発明の目的は、上記問題を解決して、比較的低コストで製造でき、白色感と耐疲労性物性を有するタイヤ用ゴム組成物を提供することにある。 Accordingly, an object of the present invention is to provide a tire rubber composition that solves the above problems and can be produced at a relatively low cost, and has a white feeling and fatigue resistance.
本発明に従えば、（Ａ）ハロゲン化ブチルゴム２５〜６５重量部、エチレンプロピレンジエン三元共重合ゴム１５〜２５重量部及びジエン系ゴム６０〜１０重量部を含むブレンドゴム１００重量部、（Ｂ）白色充填剤として二酸化チタン及びクレーをその比二酸化チタン／クレーが１／１〜１／２．５となる比率（重量比）で総量として６０〜１００重量部並びに（Ｃ）脂肪酸金属石鹸をフィラー総量の１〜８重量％含んでなるタイヤ用ゴム組成物が提供される。 In accordance with the present invention, (A) 25 to 65 parts by weight of a halogenated butyl rubber, 15 to 25 parts by weight of an ethylene propylene diene terpolymer rubber and 60 to 10 parts by weight of a diene rubber 100 parts by weight of (B ) Titanium dioxide and clay as white fillers The ratio of titanium dioxide / clay is 1/1 to 1 / 2.5 (weight ratio), and the total amount is 60 to 100 parts by weight and (C) fatty acid metal soap as filler A tire rubber composition comprising 1 to 8% by weight of the total amount is provided.
本発明に従えば、更に、カラーテスターにて測定したＬ＊，ｂ＊がＬ＊≧８６．０、ｂ＊≦３．０である前記ゴム組成物を、ホワイトサイド用コンパウンドとして用いた空気入りタイヤが提供される。 According to the present invention, the rubber composition having L * and b * measured by a color tester satisfying L * ≧ 86.0 and b * ≦ 3.0 is used as a white side compound. Tires are provided.
本発明によれば、ジエン系ゴム／ハロゲン化ブチルゴム／エチレンプロピレンジエン三元共重合体の特定のポリマー系に、白色充填剤としてクレーと二酸化チタンを特定の割合で配合し、更にその白色充填剤に対し特定の割合で、天然脂肪酸金属石鹸を配合することによって、白色感を高く且つコスト、加工性に優れたタイヤホワイトサイド用ゴム組成物を得ることができる。 According to the present invention, clay and titanium dioxide are blended in a specific ratio as a white filler in a specific polymer system of diene rubber / halogenated butyl rubber / ethylene propylene diene terpolymer, and the white filler In contrast, by blending natural fatty acid metal soap at a specific ratio, a tire white side rubber composition having high whiteness and excellent cost and processability can be obtained.
本発明者らは前記課題を解決すべく研究を進めた結果、（Ａ）ハロゲン化ブチルゴム２５〜６５重量部、エチレンプロピレンジエン三元共重合体ゴム（ＥＰＤＭ）１５〜２５重量部及びジエン系ゴム６０〜１０重量部を含有するブレンドゴム１００重量部に、（Ｂ）白色充填剤として二酸化チタン／クレーが、１／１〜１／２．５の比率（重量比）で総量として６０〜１００重量部配合し、更に（Ｃ）脂肪酸金属石鹸をフィラー総量の１〜８重量％配合することにより、前記目的を達成したタイヤ用ゴム組成物を得ることに成功した。 As a result of researches to solve the above problems, the present inventors have found that (A) 25 to 65 parts by weight of halogenated butyl rubber, 15 to 25 parts by weight of ethylene propylene diene terpolymer rubber (EPDM), and diene rubber 100 parts by weight of blend rubber containing 60 to 10 parts by weight, (B) titanium dioxide / clay as a white filler, 60 to 100 weights as a total amount in a ratio (weight ratio) of 1/1 to 1 / 2.5 The rubber composition for tires that achieved the above object was successfully obtained by blending 1 part by weight of (C) fatty acid metal soap and 1-8% by weight of the total amount of filler.
本発明のゴム組成物に配合するブレンドゴム（Ａ）はハロゲン化ブチルゴム２５〜６５重量部、好ましくは３０〜６０重量部、エチレンプロピレン三元共重合体ゴム１５〜２５重量部及びジエン系ゴム６０〜１０重量部、好ましくは５５〜１５重量部を含有する。このブレンドゴム中のハロゲン化ブチルゴムの量が少ないと十分な耐候性や耐疲労性が発揮出来ないので好ましくなく、逆に多いと加硫速度が遅くなったり、発熱性が高くなりすぎるので好ましくない。またＥＰＤＭについてもハロゲン化ブチルと同様である。 The blend rubber (A) to be blended with the rubber composition of the present invention is 25 to 65 parts by weight of halogenated butyl rubber, preferably 30 to 60 parts by weight, 15 to 25 parts by weight of ethylene propylene terpolymer rubber, and diene rubber 60. 10 to 10 parts by weight, preferably 55 to 15 parts by weight. If the amount of halogenated butyl rubber in this blend rubber is small, it is not preferable because sufficient weather resistance and fatigue resistance cannot be exhibited. Conversely, if it is too large, the vulcanization rate is slow and the heat build-up becomes too high. . EPDM is the same as butyl halide.
本発明において使用するハロゲン化ブチルゴムとしては例えば塩素化ブチルゴムや臭素化ブチルゴムなどのタイヤ用その他のゴム組成物に配合することができる任意のゴムとすることができるがイソプレン量１．０〜２．０モル％、結合ハロゲン量が１．０〜２．０重量％のゴムの使用が好ましい。一方、ＥＰＤＭとしても特に限定されるものではないが、ヨウ素価が２０〜３０のものがジエン系ゴムと混合した場合の共加硫性がよいので好ましい。更にジエン系ゴムとしては天然ゴム（ＮＲ）、ポリイソプレンゴム（ＩＲ）、ポリブタジエンゴム（ＢＲ）、スチレン−ブタジエン共重合体ゴム（ＳＢＲ）などを用いることができる。 The halogenated butyl rubber used in the present invention can be any rubber that can be blended with other rubber compositions for tires such as chlorinated butyl rubber and brominated butyl rubber, but the amount of isoprene is 1.0 to 2. It is preferable to use a rubber having 0 mol% and a bound halogen content of 1.0 to 2.0% by weight. On the other hand, EPDM is not particularly limited, but those having an iodine number of 20 to 30 are preferable because they have good co-vulcanizability when mixed with diene rubber. Furthermore, natural rubber (NR), polyisoprene rubber (IR), polybutadiene rubber (BR), styrene-butadiene copolymer rubber (SBR), etc. can be used as the diene rubber.
本発明のゴム組成物には成分（Ｂ）の白色充填剤として、二酸化チタン／クレーを、１／１〜１／２．５（重量比）、好ましくは１／１．５〜１／２．２の比率で総量が６０〜１００重量部、好ましくは６５〜９０重量部配合する。この配合量が少ないと補強性が極端に低下するので好ましくなく、逆に多いと混練性が悪化しすぎて物性低下を引きおこすので好ましくない。二酸化チタン／クレーの配合比率が高いと（即ち二酸化チタンの割合が多いと）混練性の悪化やコストが高くなるので好ましくなく、逆に低いとベースとなる白色感が発揮できないので好ましくない。 In the rubber composition of the present invention, titanium dioxide / clay as a white filler of component (B) is 1/1 to 1 / 2.5 (weight ratio), preferably 1 / 1.5 to 1/2. The total amount is 60 to 100 parts by weight, preferably 65 to 90 parts by weight, in a ratio of 2. If the blending amount is small, the reinforcing property is extremely lowered, which is not preferable. On the contrary, if the blending amount is large, the kneading property is excessively deteriorated and the physical properties are lowered. When the blending ratio of titanium dioxide / clay is high (that is, when the ratio of titanium dioxide is large), the kneadability deteriorates and the cost increases, which is not preferable. On the contrary, when the ratio is low, the base whiteness cannot be exhibited.
本発明において使用する二酸化チタンは、ゴム組成物などに充填剤として配合される任意の二酸化チタンを用いることができる。 As the titanium dioxide used in the present invention, any titanium dioxide blended as a filler in a rubber composition or the like can be used.
同様にクレーとしても任意のものを用いることができる。 Similarly, any clay can be used.
本発明のゴム組成物中には、第三成分として、脂肪酸金属石鹸（Ｃ）をフィラー総量の１〜８重量％、好ましくは１．５〜７重量％配合する。この配合量が少ないと従来以上の白色感が発揮できないので好ましくなく、逆に多いと加硫速度の低下を引きおこすので好ましくない。本発明において使用する脂肪酸金属石鹸としては、亜鉛／カリウム系脂肪酸石鹸や不飽和脂肪酸亜鉛等から選ばれる任意のものを使用できる。 In the rubber composition of the present invention, fatty acid metal soap (C) is blended as a third component in an amount of 1 to 8% by weight, preferably 1.5 to 7% by weight, based on the total amount of filler. If the blending amount is small, it is not preferable because a white feeling more than the conventional one cannot be exhibited. As the fatty acid metal soap used in the present invention, any one selected from zinc / potassium fatty acid soap and unsaturated fatty acid zinc can be used.
本発明のゴム組成物はタイヤのホワイトサイド用に使用する場合にはそのゴム組成物がカラーテスターによるＬ＊，ｂ＊の値（ＪＩＳ Ｚ８７２２に準拠し、スガ試験機製カラーテスターにより測定）がそれぞれＬ＊≧８６．０、ｂ＊≦３．０であるのが好ましい。このＬ＊は、明度を表し、数字が大きい方が明るい（白い）状態を表す。またｂ＊については、数字が大きいほど黄色く小さいほど青くなる状態を示す。本発明においては、Ｌ＊の値が大きく、ｂ＊の値が小さくすることで白色感を高く制御することができる。 When the rubber composition of the present invention is used for the white side of a tire, the rubber composition has L * and b * values (measured by a color tester manufactured by Suga Test Instruments) according to JIS Z8722. It is preferable that L * ≧ 86.0 and b * ≦ 3.0. This L * represents lightness, and a larger number represents a brighter (white) state. Regarding b * , the larger the number, the more yellow and the blue the more blue. In the present invention, whiteness can be controlled to be high by increasing the value of L * and decreasing the value of b * .
本発明に係るゴム組成物には、前記した成分に加えて、炭酸カルシウム、炭酸マグネシウムやシリカなどのその他の補強剤（フィラー）、加硫又は架橋剤、加硫又は架橋促進剤、各種オイル、老化防止剤、可塑剤などのタイヤ用、その他のゴム組成物用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は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。 In addition to the components described above, the rubber composition according to the present invention includes other reinforcing agents (fillers) such as calcium carbonate, magnesium carbonate and silica, vulcanization or crosslinking agents, vulcanization or crosslinking accelerators, various oils, Various additives that are generally blended for tires such as anti-aging agents and plasticizers and other rubber compositions can be blended, and such additives are kneaded by a general method to form a composition. Can be used for vulcanization or crosslinking. As long as the amount of these additives is not contrary to the object of the present invention, a conventional general amount can be used.
以下、実施例によって本発明を更に説明するが、本発明の範囲をこれらの実施例に限定するものでないことはいうまでもない。 EXAMPLES Hereinafter, although an Example demonstrates this invention further, it cannot be overemphasized that the scope of the present invention is not limited to these Examples.
実施例１〜４及び比較例１〜３
サンプルの調製
表Ｉに示す配合において、加硫促進剤と硫黄を除く成分を２．０リットルの密閉型ミキサーで１０分間混練し、１３０℃に達したときに放出してマスターバッチを得た。このマスターバッチに加硫促進剤と硫黄をオープンロールで混練し、ゴム組成物を得た。
Examples 1-4 and Comparative Examples 1-3
Sample preparation In the formulation shown in Table I, components other than the vulcanization accelerator and sulfur were kneaded for 10 minutes in a 2.0 liter closed mixer, and released when the temperature reached 130 ° C to obtain a master batch. A vulcanization accelerator and sulfur were kneaded with this masterbatch with an open roll to obtain a rubber composition.
次に得られたゴム組成物を１５×１５×０．２cmの金型中で１６０℃で１５分間加硫して加硫ゴムシートを調製し、以下に示す試験法で加硫ゴムの物性を測定した。結果は表Ｉに示す。 Next, the obtained rubber composition was vulcanized in a 15 × 15 × 0.2 cm mold at 160 ° C. for 15 minutes to prepare a vulcanized rubber sheet, and the physical properties of the vulcanized rubber were measured by the following test methods. It was measured. The results are shown in Table I.
ゴム物性評価試験法
１）ホワイトサイド部の色：
カラーテスターＬ＊ スガ試験機製カラーテスターにて、ＪＩＳ Ｚ８７２２に準拠して測定。
カラーテスターｂ＊ スガ試験機製カラーテスターにて、ＪＩＳ Ｚ８７２２に準拠して測定。
（注）Ｌ＊の値が大きく、ｂ＊の値が小さいほうが白色感が高い。
２）目視白色感：ゴム表面を目視で観察し、白色感の良い順に◎→○→△と３段階で評価した。
３）混合加工性：未加硫ゴム組成物を１０分間混合した際に、白色粉体が充分に取り込まれた場合を○、ゴム中に取り込みが充分でない場合を×とした。
４）定歪疲労耐疲労性：定歪み伸張を与えた条件の疲労試験を実施し、サンプルの破断に至った伸張回数を比較例１を１００として指数表示した。数字が大きいほうが耐疲労性に優れることを示す。
Rubber physical property evaluation test method 1) White side color:
Color tester L * Measured according to JIS Z8722 using a color tester manufactured by Suga Test Instruments.
Color tester b * Measured according to JIS Z8722 using a color tester manufactured by Suga Test Instruments.
(Note) Whiteness is higher when the value of L * is larger and the value of b * is smaller.
2) Visual whiteness: The rubber surface was visually observed and evaluated in three stages: ◎ → ○ → Δ in order of good whiteness.
3) Mixed workability: when the unvulcanized rubber composition was mixed for 10 minutes, the case where the white powder was sufficiently taken in was marked as ◯, and the case where the white powder was not taken up sufficiently was marked as x.
4) Fatigue resistance at constant strain: Fatigue test was performed under the condition that constant strain elongation was applied, and the number of stretches that led to the fracture of the sample was expressed as an index with Comparative Example 1 being 100. Larger numbers indicate better fatigue resistance.
表Ｉ脚注
＊１：天然ゴム（ＳＴＲ２０）
＊２：Ｃｌ−ＩＩＲ（ＥＸＸＯＮ社製Ｃｌ−ＩＩＲ）
＊３：ＥＰＴ（住友化学（株）製エスプレン５０５Ａ）
＊４：ケンタッキーテネシークレイカンパニー社製Ｓｕｐｒｅｘ Ｃｌａｙ
＊５：石原産業（株）製ＣＲ−６０
＊６：群青（第一化成工業（株）製群青）
＊７：ワックス（日本精蝋（株）製パラフィンワックス）
＊８：パラフィンオイル（昭和シェル（株）製プロセスオイル）
＊９：脂肪酸金属石鹸類１（ラインケミー（株）製アクチプラストＰＰ）
＊１０：脂肪酸金属石鹸類２（ストラクトール製ＥＦ４４）
＊１１：亜鉛華（正同化学工業（株）製酸化亜鉛）
＊１２：ステアリン酸（日本油脂（株）製工業用ステアリン酸）
＊１３：イオウ（（株）鶴見化学工業製５％油入り微粉硫黄）
＊１４：加硫促進剤ＮＳ（三新化学工業（株）製サンセラーＮＳ−Ｇ）
＊１５：加硫促進剤ＤＴ−Ｏ（住友化学（株）製ソクシノールＤＴ−Ｏ）
Table I Footnote * 1: Natural rubber (STR20)
* 2: Cl-IIR (Cl-IIR manufactured by EXXON)
* 3: EPT (Esprene 505A manufactured by Sumitomo Chemical Co., Ltd.)
* 4: Suprex Clay manufactured by Kentucky Tennessee Clay Company
* 5: CR-60 manufactured by Ishihara Sangyo Co., Ltd.
* 6: Ultramarine (Daisei Kasei Kogyo Co., Ltd.)
* 7: Wax (paraffin wax manufactured by Nippon Seiwa Co., Ltd.)
* 8: Paraffin oil (Process oil manufactured by Showa Shell Co., Ltd.)
* 9: Fatty acid metal soaps 1 (Acneplast PP manufactured by Rhein Chemie)
* 10: Fatty acid metal soap 2 (Str44 EF44)
* 11: Zinc flower (Zinc Oxide manufactured by Shodo Chemical Industry Co., Ltd.)
* 12: Stearic acid (Nippon Yushi Co., Ltd. Industrial stearic acid)
* 13: Sulfur (5% oil-filled fine sulfur from Tsurumi Chemical Co., Ltd.)
* 14: Vulcanization accelerator NS (Sunseller NS-G manufactured by Sanshin Chemical Industry Co., Ltd.)
* 15: Vulcanization accelerator DT-O (Sokushinol DT-O manufactured by Sumitomo Chemical Co., Ltd.)
比較例１は従来のホワイトコンパウンドの配合であり、実施例１は本発明に従った配合で、表Ｉの結果からも明らかなように、比較例１に比較して白色感の向上が見られ、加工性や耐疲労性も問題ない。実施例２は脂肪酸金属石鹸の量をフィラー増量の７％弱まで増量した例で、実施例１に比べて更に良好な結果が得られた。 Comparative Example 1 is a blend of a conventional white compound, and Example 1 is a blend according to the present invention. As is clear from the results of Table I, an improvement in whiteness is seen as compared with Comparative Example 1. There is no problem in workability and fatigue resistance. Example 2 was an example in which the amount of fatty acid metal soap was increased to a little less than 7% of the filler increase, and better results were obtained than in Example 1.
実施例３はポリマー系の配合比を本発明の範囲内で変化させた例で、白色感の向上と耐疲労性の大きな向上がみられ、加工性も問題なく、Ｌ＊、ｂ＊値も良好であった。実施例４は実施例３と脂肪酸金属石鹸の種類を変えた例で、同様に良好な結果が得られた。 Example 3 is an example in which the blending ratio of the polymer system was changed within the scope of the present invention. The whiteness and the fatigue resistance were greatly improved, the workability was satisfactory, and the L * and b * values were also high. It was good. Example 4 was an example in which the type of fatty acid metal soap was changed from Example 3, and good results were obtained in the same manner.
比較例２はクレーと二酸化チタンの配合比が本発明の範囲外で、しかも脂肪酸金属石鹸を使用していないため混合加工性が良くなく、比較例３は二酸化チタンの配合比が少なすぎて、白さが発揮できていない。 In Comparative Example 2, the blending ratio of clay and titanium dioxide is outside the range of the present invention, and since the fatty acid metal soap is not used, the mixing processability is not good. In Comparative Example 3, the blending ratio of titanium dioxide is too small. The whiteness has not been demonstrated.
以上の通り、本発明に従ってブレンドゴム（Ａ）、白色充填剤（Ｂ）及び脂肪酸金属石鹸を所定の割合で配合したゴム組成物は、白色感を高く且つコスト、加工性に優れたタイヤホワイトサイド用ゴム組成物として使用するのに適している。 As described above, according to the present invention, the rubber composition containing the blend rubber (A), the white filler (B) and the fatty acid metal soap in a predetermined ratio is a tire white side having a high whiteness and excellent cost and processability. Suitable for use as a rubber composition.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005290433A JP2007099874A (en) | 2005-10-03 | 2005-10-03 | Tire rubber composition and pneumatic tire using it |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005290433A JP2007099874A (en) | 2005-10-03 | 2005-10-03 | Tire rubber composition and pneumatic tire using it |
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| JP2007099874A true JP2007099874A (en) | 2007-04-19 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102344614A (en) * | 2011-06-28 | 2012-02-08 | 江苏远洋东泽电缆股份有限公司 | Insulating material of power cable for dredger underwater shovel arm, and production method thereof |
| CN106397883A (en) * | 2015-07-27 | 2017-02-15 | 东洋橡胶工业株式会社 | Rubber composition for tire and pneumatic tire |
| US10179479B2 (en) | 2015-05-19 | 2019-01-15 | Bridgestone Americas Tire Operations, Llc | Plant oil-containing rubber compositions, tread thereof and race tires containing the tread |
| CN110396246A (en) * | 2018-04-24 | 2019-11-01 | 现代自动车株式会社 | Rubber composition for dynamic shock absorber and dynamic shock absorber including same |
-
2005
- 2005-10-03 JP JP2005290433A patent/JP2007099874A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102344614A (en) * | 2011-06-28 | 2012-02-08 | 江苏远洋东泽电缆股份有限公司 | Insulating material of power cable for dredger underwater shovel arm, and production method thereof |
| US10179479B2 (en) | 2015-05-19 | 2019-01-15 | Bridgestone Americas Tire Operations, Llc | Plant oil-containing rubber compositions, tread thereof and race tires containing the tread |
| CN106397883A (en) * | 2015-07-27 | 2017-02-15 | 东洋橡胶工业株式会社 | Rubber composition for tire and pneumatic tire |
| CN110396246A (en) * | 2018-04-24 | 2019-11-01 | 现代自动车株式会社 | Rubber composition for dynamic shock absorber and dynamic shock absorber including same |
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