WO2018021563A1 - Rubber composition for aviation tires, crosslinked rubber composition for aviation tires and aviation tire - Google Patents
Rubber composition for aviation tires, crosslinked rubber composition for aviation tires and aviation tire Download PDFInfo
- Publication number
- WO2018021563A1 WO2018021563A1 PCT/JP2017/027552 JP2017027552W WO2018021563A1 WO 2018021563 A1 WO2018021563 A1 WO 2018021563A1 JP 2017027552 W JP2017027552 W JP 2017027552W WO 2018021563 A1 WO2018021563 A1 WO 2018021563A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- aviation
- mass
- rubber composition
- rubber
- parts
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K5/098—Metal salts of carboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L21/00—Compositions of unspecified rubbers
Definitions
- the present invention relates to a rubber composition for aviation tires, a crosslinked rubber composition for aviation tires, and an aviation tire.
- Patent Document 1 provides a composite cable as a radial reinforcing element of a carcass reinforcing body by providing means for imparting dimensional stability, more specifically, means for imparting dimensional stability. It is described that a tire for aviation tires excellent in durability can be provided by using.
- Patent Document 1 Conventionally, as described in Patent Document 1, it has been attempted to provide a tire having excellent durability by adjusting the structure of the aviation tire and the member to be used. On the other hand, sufficient studies have not been made to improve the durability of aviation tires by changing the composition of the rubber composition. In particular, in aviation tires that repeatedly take off and land under repeated high-speed and high-load conditions, the tires are repeatedly heated and cooled, and the burden on the rubber member is large, so further improvement in the durability of the composition itself is required. It was done.
- An object of the present invention is to provide a rubber composition for an aviation tire from which an aviation tire excellent in wear resistance and crack resistance is obtained, a crosslinked rubber composition for an aviation tire obtained by crosslinking the rubber composition for an aviation tire, and the An object is to provide an aviation tire using the crosslinked rubber composition for an aviation tire.
- the present invention relates to the following ⁇ 1> to ⁇ 12>.
- a rubber component containing a diene rubber is contained, and the fatty acid content relative to 100 parts by mass of the rubber component is less than 0.5 parts by mass (preferably 0.1 parts by mass or less, more preferably 0.03 parts by mass or less).
- a rubber composition for an aviation tire which is characterized in that it exists.
- the total content of zinc oxide and fatty acid with respect to 100 parts by mass of the rubber component is 4 parts by mass or less (preferably 3.5 parts by mass or less, more preferably 3 parts by mass or less, preferably 0.5 parts by mass or more, more
- the rubber composition for aviation tires according to ⁇ 1> preferably 1 part by mass or more, more preferably 1.5 parts by mass or more, and still more preferably 2 parts by mass or more.
- the rubber composition contains zinc oxide, and the mass ratio (zinc oxide / fatty acid) of the zinc oxide content to the fatty acid content is 3 or more (preferably 5 or more, more preferably 10 or more, and still more preferably. 30 or more)
- the rubber composition contains zinc oxide, and the content of zinc oxide with respect to 100 parts by mass of the rubber component is 3 parts by mass or less (preferably 2.5 parts by mass or less, preferably 0.5 parts by mass or more, more preferably Is 1 part by mass or more, more preferably 1.5 parts by mass or more).
- ⁇ 5> The aviation according to any one of ⁇ 1> to ⁇ 3>, wherein the rubber composition contains active zinc oxide, and the content of active zinc oxide with respect to 100 parts by mass of the rubber component is 3 parts by mass or less. Rubber composition for tires.
- ⁇ 6> The rubber composition for an aviation tire according to any one of ⁇ 1> to ⁇ 5>, which contains substantially no fatty acid.
- ⁇ 7> The rubber composition for an aviation tire according to any one of ⁇ 1> to ⁇ 6>, further including a fatty acid metal salt.
- ⁇ 8> The rubber composition for an aviation tire according to ⁇ 7>, wherein the content of the fatty acid metal salt with respect to 100 parts by mass of the rubber component is 2.5 parts by mass or less.
- ⁇ 9> The rubber composition for an aviation tire according to any one of ⁇ 1> to ⁇ 8>, wherein the diene rubber includes at least one selected from the group consisting of natural rubber, polyisoprene, and butadiene rubber.
- a crosslinked rubber composition for an aviation tire obtained by crosslinking the rubber composition according to any one of ⁇ 1> to ⁇ 9>.
- a rubber composition for an aviation tire from which an aviation tire excellent in wear resistance and crack resistance is obtained a crosslinked rubber composition for an aviation tire obtained by crosslinking the rubber composition for an aviation tire, and the An aviation tire using the crosslinked rubber composition for an aviation tire can be provided.
- a to B indicating a numerical range represents a numerical range including A and B as end points, and when A ⁇ B, it represents “A or more and B or less”, and A> In the case of B, it represents “A or less and B or more”.
- a mass part and mass% are synonymous with a weight part and weight%, respectively.
- the rubber composition for aviation tires of the present invention contains a rubber component containing a diene rubber, and the fatty acid content relative to 100 parts by mass of the rubber component is less than 0.5 parts by mass. It is characterized by being.
- the present inventor has found that, in an aviation tire, although the wear resistance and crack resistance are excellent in the initial stage, the wear resistance and crack resistance may deteriorate due to use. As a result of intensive studies, it has been found that by reducing the content of fatty acid in the rubber composition, the above-described deterioration of wear resistance and crack resistance is suppressed, and the present invention has been completed.
- being excellent in wear resistance and crack resistance means not only in the initial stage, but also excellent in wear resistance and crack resistance particularly after deterioration due to high heat or the like due to use. Therefore, it is considered that the superior effect is exhibited when applied to aviation tires over passenger car and truck tires.
- each component constituting the rubber composition will be described.
- the rubber composition for aviation tires of the present invention contains a rubber component, and the rubber component contains diene rubber.
- the diene rubber include natural rubber and synthetic diene rubber.
- Synthetic diene rubbers include polyisoprene (IR), butadiene rubber (polybutadiene, BR), styrene-butadiene rubber (SBR), acrylonitrile-butadiene rubber (NBR), chloroprene rubber (CR), butyl rubber (IIR), halogenated butyl rubber ( X-IIR), ethylene-propylene rubber (EPM), ethylene-propylene-diene copolymer rubber (EPDM), styrene-isoprene-butadiene copolymer rubber (SIBR) and the like.
- the rubber component may contain acrylic rubber, epichlorohydrin rubber, silicone rubber, fluorine rubber, urethane rubber, or the like.
- the content of the diene rubber in the rubber component is preferably 50% by mass or more, more preferably 80% by mass or more, still more preferably 90% by mass or more, still more preferably 100% by mass, that is, the total amount of the rubber component. Is diene rubber. When the diene rubber content in the rubber component is within the above range, a tire having excellent wear resistance and crack resistance is obtained, which is preferable.
- the rubber composition of the present invention preferably contains at least one selected from the group consisting of natural rubber, polyisoprene, and butadiene rubber as the diene rubber, and at least one selected from the group consisting of natural rubber and polyisoprene. More preferably, it has seeds and butadiene rubber.
- the total content of natural rubber and polyisoprene in the rubber component is preferably 40% by mass or more, more preferably 55% by mass or more, and still more preferably 70%, from the viewpoint of obtaining a tire excellent in wear resistance and crack resistance. It is 95 mass% or less, Preferably it is 95 mass% or less, More preferably, it is 85 mass% or less.
- the content of the butadiene rubber in the rubber component is preferably 10% by mass or more, more preferably 15% by mass or more, from the viewpoint of obtaining an aviation tire excellent in wear resistance and crack resistance. Is 60% by mass or less, more preferably 45% by mass or less, and still more preferably 30% by mass or less.
- a butadiene rubber having a cis 1,4-bond amount of 92% or more may be used as the butadiene rubber.
- the amount of cis 1,4-bond is more preferably 95% or more, and still more preferably 98% or more.
- the weight average molecular weight of the butadiene rubber is preferably 1 ⁇ 10 4 to 1 ⁇ 10 7 , more preferably 3 ⁇ 10 4 to 1 ⁇ 10 6 , and still more preferably 5 ⁇ 10 4 to 6 ⁇ 10 5 . .
- the weight average molecular weight is a value measured by GPC (gel permeation chromatography) and converted to standard polystyrene.
- the content of the fatty acid with respect to 100 parts by mass of the rubber component is less than 0.5 parts by mass.
- content of a fatty acid is content of fatty acid itself, and does not include content of the fatty acid in the fatty acid metal salt mentioned later.
- the fatty acid is a compound represented by R—COOH, and R is preferably an aliphatic group having 6 to 30 carbon atoms, and is a linear or branched, saturated or unsaturated aliphatic group. It is more preferable.
- fatty acids include saturated fatty acids such as palmitic acid, stearic acid, caproic acid, caprylic acid, capric acid, lauric acid, myristic acid, arachidic acid, behenic acid, serotic acid, montanic acid, melicic acid, and pelargonic acid.
- the content of the fatty acid relative to 100 parts by mass of the rubber component is less than 0.5 parts by mass, preferably 0.3 parts by mass or less, more preferably 0.1 parts by mass or less, and 0.03 parts by mass. It is more preferable that the amount is not more than part, and it is even more preferable that the content is not substantially contained.
- “substantially does not contain” means that the content of fatty acid with respect to 100 parts by mass of the rubber component is 0.01 parts by mass or less. In the present invention, it is preferable not to add a fatty acid, but this does not exclude the presence of a small amount of fatty acid as an impurity.
- the rubber composition for aviation tires of the present invention may contain zinc oxide, and preferably contains zinc oxide.
- zinc oxide is also called zinc white and is an oxide of zinc represented by the chemical formula ZnO.
- Zinc oxide is preferably so-called activated zinc oxide (activated zinc white) having a large specific surface area because it is more excellent in wear resistance and crack resistance after thermal degradation.
- the active zinc oxide is zinc oxide having a specific surface area (BET specific surface area) measured by a BET method using nitrogen as an adsorbate in accordance with JIS Z 8830: 2013 of 10 m 2 / g or more.
- the content of zinc oxide with respect to 100 parts by mass of the rubber component is preferably 4 parts by mass or less, more preferably 3.5 parts by mass or less, from the viewpoint of suppressing deterioration of wear resistance and crack resistance. Preferably it is 3 mass parts or less, More preferably, it is 2.5 mass parts or less. Further, from the viewpoint of obtaining a crosslinked rubber composition having excellent crosslinkability and excellent rigidity, the content of zinc oxide with respect to 100 parts by mass of the rubber component is preferably 0.5 parts by mass or more, more preferably 1 part by mass or more, More preferably, it is 1.5 parts by mass or more.
- the total content of zinc oxide and fatty acid with respect to 100 parts by mass of the rubber component is preferably 4 parts by mass or less, more preferably 3.5 parts by mass or less, and still more preferably 3 parts by mass or less.
- the total content of zinc oxide and fatty acid with respect to 100 parts by mass of the rubber component is preferably 0.5 parts by mass or more, more preferably 1 part by mass or more, still more preferably 1.5 parts by mass or more, and still more preferably 2 parts. More than part by mass.
- the rubber composition preferably contains zinc oxide, and the mass ratio of the zinc oxide content to the fatty acid content (zinc oxide / fatty acid) is preferably 3 or more. It is more preferably 5 or more, still more preferably 10 or more, and still more preferably 30 or more.
- the mass ratio of the content of zinc oxide to the content of fatty acid is within the above range, a crosslinked rubber composition for an aviation tire and an aviation tire in which deterioration of wear resistance and crack resistance is further suppressed can be obtained.
- the specific surface area of zinc oxide is preferably 4 m 2 / g or more, more preferably 10 m 2 / g or more, and 20 m 2 / g or more. More preferably it is.
- the rubber composition of the present invention preferably contains a fatty acid metal salt.
- a metal salt of a saturated fatty acid, a metal salt of an unsaturated fatty acid, or a mixture thereof can be used.
- fatty acid metal salts include saturated fatty acids such as palmitic acid, stearic acid, caproic acid, caprylic acid, capric acid, lauric acid, myristic acid, arachidic acid, behenic acid, serotic acid, montanic acid, and melicic acid.
- the metal element that forms the metal salt with the saturated fatty acid or unsaturated fatty acid described above is at least selected from the group consisting of K, Ca, Na, Mg, Zn, Co, Ni, Ba, Fe, Al, Cu, and Mn.
- One type of metal element is mentioned, and at least one type of metal element selected from the group consisting of Zn, K, and Ca is preferable, and Zn (zinc) is more preferable. Therefore, the fatty acid metal salt is particularly preferably fatty acid zinc.
- the fatty acid metal salt is preferably a metal salt of a monofatty acid having 8 to 18 carbon atoms, specifically, zinc caprylate, zinc pelargonate, zinc caprate, zinc laurate, zinc myristate, zinc palmitate, Preferred examples include zinc stearate, zinc oleate, and zinc linoleate. Among these, zinc stearate, zinc oleate, and zinc palmitate are more preferably exemplified.
- Aktiplast series manufactured by Rhein Chemie, specifically Aktiplast PP (main components are zinc oleate and zinc palmitate)
- ULTRALFOW series manufactured by Performance Additives
- STRUKTOL A50P manufactured by Structol
- Exton L-2-G manufactured by Kawaguchi Chemical Industry Co., Ltd.
- a fatty acid metal salt may be used individually by 1 type, and may use 2 or more types together.
- the content of the fatty acid metal salt with respect to 100 parts by mass of the rubber component is preferably 3 parts by mass or less, more preferably 2.5 parts by mass or less, and even more preferably 2 parts. From the same viewpoint, it is preferably 0.5 parts by mass or more, more preferably 1 part by mass or more.
- the rubber composition of the present invention preferably contains carbon black from the viewpoint of improving wear resistance and crack resistance.
- the carbon black may be appropriately selected from known carbon blacks used in rubber compositions, particularly tire rubber compositions. Carbon black may be used alone or in combination of two or more.
- the content of carbon black with respect to 100 parts by mass of the rubber component is preferably 20 to 80 parts by mass, more preferably 30 to 70 parts by mass, and further preferably 40 to 60 parts by mass from the viewpoint of improving wear resistance and crack resistance. It is.
- the rubber composition of the present invention is preferably used after being crosslinked, it preferably contains a crosslinking agent.
- the crosslinking agent include a sulfur-based crosslinking agent, an organic peroxide-based crosslinking agent, an inorganic crosslinking agent, a polyamine crosslinking agent, a resin crosslinking agent, and an oxime-nitrosamine-based crosslinking agent.
- a sulfur type crosslinking agent is preferable and sulfur is more preferable.
- a crosslinking agent may be used individually by 1 type, and may use 2 or more types together.
- the content of the crosslinking agent is not particularly limited, but preferably 0.1 to 20 parts by mass with respect to 100 parts by mass of the rubber component from the viewpoint of sufficiently proceeding crosslinking and suppressing crosslinking during kneading. Part, more preferably 0.5 to 5 parts by weight.
- the rubber composition of the present invention may contain an inorganic filler other than carbon black (for example, silica), a vulcanization accelerator, a reinforcing agent, a softening agent, a vulcanization aid, and coloring as necessary.
- an inorganic filler other than carbon black for example, silica
- a vulcanization accelerator for example, a vulcanization accelerator
- a reinforcing agent for example, a vulcanization accelerator
- a reinforcing agent for example, a vulcanization accelerator
- a softening agent for example, a softening agent
- a vulcanization aid a vulcanization aid
- the rubber composition for aviation tires of the present invention is produced by kneading the above components with, for example, a Banbury mixer, a roll, an internal mixer, a kneader or the like.
- Various conditions such as kneading temperature, kneading time, type of kneading apparatus and the like can be appropriately selected according to the purpose.
- mixing may be performed by 1 step
- Crosslinked rubber composition for aviation tires of the present invention is characterized in that the rubber composition of the present invention described above is crosslinked.
- Various conditions such as crosslinking temperature and time may be selected as appropriate and are not particularly limited.
- the aviation tire of the present invention uses the crosslinked rubber composition for an aviation tire of the present invention as a tire member.
- the crosslinked rubber composition for aviation tires of the present invention is suitable as a tire tread for aviation tires, but is not limited thereto, and may be used for tire members other than treads. In addition, it does not exclude using it for uses other than aviation tires, for example, belt members, such as a conveyor belt, hose products excellent in abrasion resistance and crack resistance.
- Aviation tires are kneaded with the rubber composition of the present invention and extruded into a predetermined cross-sectional shape, or coated with a fiber cord or the like to a predetermined thickness, and processed into a desired rubber member for molding a tire. And after affixing on the predetermined location of the target aviation tire, an aviation tire can be manufactured by carrying out vulcanization molding under the predetermined temperature and pressure in a predetermined mold.
- Example 1 to 9 and Comparative Examples 1 to 6 Rubber compositions of Examples and Comparative Examples were prepared.
- the obtained rubber composition was applied as a tread rubber of an aviation tire. More specifically, a radial tire for an aircraft having a tire size of 50 ⁇ 20.0R22 — 32PR was produced using the obtained rubber composition. The following evaluation was performed about the produced tire.
- Abrasion resistance test> A plate-shaped rubber plate having a thickness of 5 mm was cut out from the center rib of the tire deteriorated by the drum test described above. A test sample was prepared from the cut rubber plate and evaluated for wear resistance. The abrasion resistance was calculated by the following formula after the abrasion amount of a rubber sample was tested at 220 ° C. by a Lambourne abrasion test in accordance with JIS K 6264-1993.
- Abrasion resistance index (Abrasion amount of Comparative Example 4 / Abrasion amount of test sample) ⁇ 100 The larger the wear resistance index, the better the wear resistance.
- Test piece rotation speed 200 rpm
- Test road rotation speed 20rpm
- Test load 7kgf
- Ambient temperature 25 ° C
Abstract
The purpose of the present invention is to provide: a rubber composition for aviation tires which is capable of giving an aviation tire having excellent wear resistance and crack resistance; a crosslinked rubber composition for aviation tires which is formed by crosslinking the rubber composition for aviation tires; and an aviation tire formed using the crosslinked rubber composition for aviation tires. The rubber composition for an aviation tire according to the present invention is characterized by comprising a rubber component containing a diene rubber, and by having a fatty acid content that is less than 0.5 parts by mass with respect to 100 parts by mass of the rubber component. The total content of zinc oxide and the fatty acid with respect to 100 parts by mass of the rubber component is preferably less than or equal to 4 parts by mass.
Description
本発明は、航空タイヤ用ゴム組成物、航空タイヤ用架橋ゴム組成物、及び航空タイヤに関する。
The present invention relates to a rubber composition for aviation tires, a crosslinked rubber composition for aviation tires, and an aviation tire.
近年、環境負荷低減を目的として、廃タイヤを減らす観点から、航空タイヤに対しても、更なる耐久性が求められている。
このような問題に対して、特許文献１には、寸法安定性を付与する手段を設けること、より具体的には、寸法安定性を付与する手段が、カーカス補強体のラジアル補強要素として複合ケーブルを使用することにより、耐久性に優れた航空タイヤ用タイヤを提供することが記載されている。 In recent years, further durability has been demanded for aviation tires from the viewpoint of reducing waste tires for the purpose of reducing environmental impact.
With respect to such a problem, Patent Document 1 provides a composite cable as a radial reinforcing element of a carcass reinforcing body by providing means for imparting dimensional stability, more specifically, means for imparting dimensional stability. It is described that a tire for aviation tires excellent in durability can be provided by using.
このような問題に対して、特許文献１には、寸法安定性を付与する手段を設けること、より具体的には、寸法安定性を付与する手段が、カーカス補強体のラジアル補強要素として複合ケーブルを使用することにより、耐久性に優れた航空タイヤ用タイヤを提供することが記載されている。 In recent years, further durability has been demanded for aviation tires from the viewpoint of reducing waste tires for the purpose of reducing environmental impact.
With respect to such a problem, Patent Document 1 provides a composite cable as a radial reinforcing element of a carcass reinforcing body by providing means for imparting dimensional stability, more specifically, means for imparting dimensional stability. It is described that a tire for aviation tires excellent in durability can be provided by using.
従来、特許文献１に記載されているように、航空タイヤの構造や使用する部材を調整することにより、耐久性に優れたタイヤを提供することが試みられていた。一方、ゴム組成物の組成を変更することにより、航空タイヤの耐久性を向上させることについては、十分な検討がなされていなかった。
特に、繰り返しの高速・高加重条件での離着陸を繰り返す航空タイヤにおいては、タイヤが繰り返し加熱・冷却されることとなり、ゴム部材への負担が大きいため、組成物自体の更なる耐久性向上が求められていた。
本発明の目的は、耐摩耗性及び耐亀裂性に優れた航空タイヤが得られる航空タイヤ用ゴム組成物、該航空タイヤ用ゴム組成物を架橋してなる航空タイヤ用架橋ゴム組成物、及び該航空タイヤ用架橋ゴム組成物を用いてなる航空タイヤを提供することである。 Conventionally, as described in Patent Document 1, it has been attempted to provide a tire having excellent durability by adjusting the structure of the aviation tire and the member to be used. On the other hand, sufficient studies have not been made to improve the durability of aviation tires by changing the composition of the rubber composition.
In particular, in aviation tires that repeatedly take off and land under repeated high-speed and high-load conditions, the tires are repeatedly heated and cooled, and the burden on the rubber member is large, so further improvement in the durability of the composition itself is required. It was done.
An object of the present invention is to provide a rubber composition for an aviation tire from which an aviation tire excellent in wear resistance and crack resistance is obtained, a crosslinked rubber composition for an aviation tire obtained by crosslinking the rubber composition for an aviation tire, and the An object is to provide an aviation tire using the crosslinked rubber composition for an aviation tire.
特に、繰り返しの高速・高加重条件での離着陸を繰り返す航空タイヤにおいては、タイヤが繰り返し加熱・冷却されることとなり、ゴム部材への負担が大きいため、組成物自体の更なる耐久性向上が求められていた。
本発明の目的は、耐摩耗性及び耐亀裂性に優れた航空タイヤが得られる航空タイヤ用ゴム組成物、該航空タイヤ用ゴム組成物を架橋してなる航空タイヤ用架橋ゴム組成物、及び該航空タイヤ用架橋ゴム組成物を用いてなる航空タイヤを提供することである。 Conventionally, as described in Patent Document 1, it has been attempted to provide a tire having excellent durability by adjusting the structure of the aviation tire and the member to be used. On the other hand, sufficient studies have not been made to improve the durability of aviation tires by changing the composition of the rubber composition.
In particular, in aviation tires that repeatedly take off and land under repeated high-speed and high-load conditions, the tires are repeatedly heated and cooled, and the burden on the rubber member is large, so further improvement in the durability of the composition itself is required. It was done.
An object of the present invention is to provide a rubber composition for an aviation tire from which an aviation tire excellent in wear resistance and crack resistance is obtained, a crosslinked rubber composition for an aviation tire obtained by crosslinking the rubber composition for an aviation tire, and the An object is to provide an aviation tire using the crosslinked rubber composition for an aviation tire.
本発明者は鋭意検討した結果、ジエンゴムを含むゴム成分を含有する航空タイヤ用ゴム組成物において、ゴム成分に対する脂肪酸の含有量を低減することによって、上記の課題を解決しうることを見出した。
As a result of intensive studies, the present inventor has found that the above-described problems can be solved by reducing the content of fatty acid relative to the rubber component in the rubber composition for aviation tires containing the rubber component including diene rubber.
すなわち、本発明は、以下の＜１＞～＜１２＞に関する。
＜１＞ ジエンゴムを含むゴム成分を含有し、ゴム成分１００質量部に対する脂肪酸の含有量が０．５質量部未満（好ましくは０．１質量部以下、より好ましくは０．０３質量部以下）であることを特徴とする、航空タイヤ用ゴム組成物。
＜２＞ ゴム成分１００質量部に対する酸化亜鉛及び脂肪酸の合計含有量が４質量部以下（好ましくは３．５質量部以下、より好ましくは３質量部以下、好ましくは０．５質量部以上、より好ましくは１質量部以上、更に好ましくは１．５質量部以上、より更に好ましくは２質量部以上）である、＜１＞に記載の航空タイヤ用ゴム組成物。
＜３＞ ゴム組成物が酸化亜鉛を含有し、脂肪酸の含有量に対する酸化亜鉛の含有量の質量比（酸化亜鉛／脂肪酸）が３以上（好ましくは５以上、より好ましくは１０以上、更に好ましくは３０以上）である、＜１＞又は＜２＞に記載の航空タイヤ用ゴム組成物。
＜４＞ ゴム組成物が酸化亜鉛を含有し、ゴム成分１００質量部に対する酸化亜鉛の含有量が３質量部以下（好ましくは２．５質量部以下、好ましくは０．５質量部以上、より好ましくは１質量部以上、更に好ましくは１．５質量部以上）である、＜１＞～＜３＞のいずれか１つに記載の航空タイヤ用ゴム組成物。
＜５＞ ゴム組成物が活性酸化亜鉛を含有し、ゴム成分１００質量部に対する活性酸化亜鉛の含有量が３質量部以下である、＜１＞～＜３＞のいずれか１つに記載の航空タイヤ用ゴム組成物。
＜６＞ 脂肪酸を実質的に含有しない、＜１＞～＜５＞のいずれか１つに記載の航空タイヤ用ゴム組成物。
＜７＞ 更に脂肪酸金属塩を含有する、＜１＞～＜６＞のいずれか１つに記載の航空タイヤ用ゴム組成物。
＜８＞ ゴム成分１００質量部に対する脂肪酸金属塩の含有量が２．５質量部以下である、＜７＞に記載の航空タイヤ用ゴム組成物。
＜9＞ ジエンゴムが、天然ゴム、ポリイソプレン、及びブタジエンゴムよりなる群から選択される少なくとも１種を含む、＜１＞～＜８＞のいずれか１つに記載の航空タイヤ用ゴム組成物。
＜１０＞ ＜１＞～＜９＞のいずれか１つに記載のゴム組成物を架橋してなる、航空タイヤ用架橋ゴム組成物。
＜１１＞ ＜１０＞に記載の航空タイヤ用架橋ゴム組成物をタイヤ部材として用いてなる、航空タイヤ。
＜１２＞ 前記タイヤ部材がタイヤトレッドである、＜１１＞に記載の航空タイヤ。 That is, the present invention relates to the following <1> to <12>.
<1> A rubber component containing a diene rubber is contained, and the fatty acid content relative to 100 parts by mass of the rubber component is less than 0.5 parts by mass (preferably 0.1 parts by mass or less, more preferably 0.03 parts by mass or less). A rubber composition for an aviation tire, which is characterized in that it exists.
<2> The total content of zinc oxide and fatty acid with respect to 100 parts by mass of the rubber component is 4 parts by mass or less (preferably 3.5 parts by mass or less, more preferably 3 parts by mass or less, preferably 0.5 parts by mass or more, more The rubber composition for aviation tires according to <1>, preferably 1 part by mass or more, more preferably 1.5 parts by mass or more, and still more preferably 2 parts by mass or more.
<3> The rubber composition contains zinc oxide, and the mass ratio (zinc oxide / fatty acid) of the zinc oxide content to the fatty acid content is 3 or more (preferably 5 or more, more preferably 10 or more, and still more preferably. 30 or more) The rubber composition for an aviation tire according to <1> or <2>.
<4> The rubber composition contains zinc oxide, and the content of zinc oxide with respect to 100 parts by mass of the rubber component is 3 parts by mass or less (preferably 2.5 parts by mass or less, preferably 0.5 parts by mass or more, more preferably Is 1 part by mass or more, more preferably 1.5 parts by mass or more). The rubber composition for an aviation tire according to any one of <1> to <3>.
<5> The aviation according to any one of <1> to <3>, wherein the rubber composition contains active zinc oxide, and the content of active zinc oxide with respect to 100 parts by mass of the rubber component is 3 parts by mass or less. Rubber composition for tires.
<6> The rubber composition for an aviation tire according to any one of <1> to <5>, which contains substantially no fatty acid.
<7> The rubber composition for an aviation tire according to any one of <1> to <6>, further including a fatty acid metal salt.
<8> The rubber composition for an aviation tire according to <7>, wherein the content of the fatty acid metal salt with respect to 100 parts by mass of the rubber component is 2.5 parts by mass or less.
<9> The rubber composition for an aviation tire according to any one of <1> to <8>, wherein the diene rubber includes at least one selected from the group consisting of natural rubber, polyisoprene, and butadiene rubber.
<10> A crosslinked rubber composition for an aviation tire obtained by crosslinking the rubber composition according to any one of <1> to <9>.
<11> An aviation tire using the crosslinked rubber composition for an aviation tire according to <10> as a tire member.
<12> The aviation tire according to <11>, wherein the tire member is a tire tread.
＜１＞ ジエンゴムを含むゴム成分を含有し、ゴム成分１００質量部に対する脂肪酸の含有量が０．５質量部未満（好ましくは０．１質量部以下、より好ましくは０．０３質量部以下）であることを特徴とする、航空タイヤ用ゴム組成物。
＜２＞ ゴム成分１００質量部に対する酸化亜鉛及び脂肪酸の合計含有量が４質量部以下（好ましくは３．５質量部以下、より好ましくは３質量部以下、好ましくは０．５質量部以上、より好ましくは１質量部以上、更に好ましくは１．５質量部以上、より更に好ましくは２質量部以上）である、＜１＞に記載の航空タイヤ用ゴム組成物。
＜３＞ ゴム組成物が酸化亜鉛を含有し、脂肪酸の含有量に対する酸化亜鉛の含有量の質量比（酸化亜鉛／脂肪酸）が３以上（好ましくは５以上、より好ましくは１０以上、更に好ましくは３０以上）である、＜１＞又は＜２＞に記載の航空タイヤ用ゴム組成物。
＜４＞ ゴム組成物が酸化亜鉛を含有し、ゴム成分１００質量部に対する酸化亜鉛の含有量が３質量部以下（好ましくは２．５質量部以下、好ましくは０．５質量部以上、より好ましくは１質量部以上、更に好ましくは１．５質量部以上）である、＜１＞～＜３＞のいずれか１つに記載の航空タイヤ用ゴム組成物。
＜５＞ ゴム組成物が活性酸化亜鉛を含有し、ゴム成分１００質量部に対する活性酸化亜鉛の含有量が３質量部以下である、＜１＞～＜３＞のいずれか１つに記載の航空タイヤ用ゴム組成物。
＜６＞ 脂肪酸を実質的に含有しない、＜１＞～＜５＞のいずれか１つに記載の航空タイヤ用ゴム組成物。
＜７＞ 更に脂肪酸金属塩を含有する、＜１＞～＜６＞のいずれか１つに記載の航空タイヤ用ゴム組成物。
＜８＞ ゴム成分１００質量部に対する脂肪酸金属塩の含有量が２．５質量部以下である、＜７＞に記載の航空タイヤ用ゴム組成物。
＜9＞ ジエンゴムが、天然ゴム、ポリイソプレン、及びブタジエンゴムよりなる群から選択される少なくとも１種を含む、＜１＞～＜８＞のいずれか１つに記載の航空タイヤ用ゴム組成物。
＜１０＞ ＜１＞～＜９＞のいずれか１つに記載のゴム組成物を架橋してなる、航空タイヤ用架橋ゴム組成物。
＜１１＞ ＜１０＞に記載の航空タイヤ用架橋ゴム組成物をタイヤ部材として用いてなる、航空タイヤ。
＜１２＞ 前記タイヤ部材がタイヤトレッドである、＜１１＞に記載の航空タイヤ。 That is, the present invention relates to the following <1> to <12>.
<1> A rubber component containing a diene rubber is contained, and the fatty acid content relative to 100 parts by mass of the rubber component is less than 0.5 parts by mass (preferably 0.1 parts by mass or less, more preferably 0.03 parts by mass or less). A rubber composition for an aviation tire, which is characterized in that it exists.
<2> The total content of zinc oxide and fatty acid with respect to 100 parts by mass of the rubber component is 4 parts by mass or less (preferably 3.5 parts by mass or less, more preferably 3 parts by mass or less, preferably 0.5 parts by mass or more, more The rubber composition for aviation tires according to <1>, preferably 1 part by mass or more, more preferably 1.5 parts by mass or more, and still more preferably 2 parts by mass or more.
<3> The rubber composition contains zinc oxide, and the mass ratio (zinc oxide / fatty acid) of the zinc oxide content to the fatty acid content is 3 or more (preferably 5 or more, more preferably 10 or more, and still more preferably. 30 or more) The rubber composition for an aviation tire according to <1> or <2>.
<4> The rubber composition contains zinc oxide, and the content of zinc oxide with respect to 100 parts by mass of the rubber component is 3 parts by mass or less (preferably 2.5 parts by mass or less, preferably 0.5 parts by mass or more, more preferably Is 1 part by mass or more, more preferably 1.5 parts by mass or more). The rubber composition for an aviation tire according to any one of <1> to <3>.
<5> The aviation according to any one of <1> to <3>, wherein the rubber composition contains active zinc oxide, and the content of active zinc oxide with respect to 100 parts by mass of the rubber component is 3 parts by mass or less. Rubber composition for tires.
<6> The rubber composition for an aviation tire according to any one of <1> to <5>, which contains substantially no fatty acid.
<7> The rubber composition for an aviation tire according to any one of <1> to <6>, further including a fatty acid metal salt.
<8> The rubber composition for an aviation tire according to <7>, wherein the content of the fatty acid metal salt with respect to 100 parts by mass of the rubber component is 2.5 parts by mass or less.
<9> The rubber composition for an aviation tire according to any one of <1> to <8>, wherein the diene rubber includes at least one selected from the group consisting of natural rubber, polyisoprene, and butadiene rubber.
<10> A crosslinked rubber composition for an aviation tire obtained by crosslinking the rubber composition according to any one of <1> to <9>.
<11> An aviation tire using the crosslinked rubber composition for an aviation tire according to <10> as a tire member.
<12> The aviation tire according to <11>, wherein the tire member is a tire tread.
本発明によれば、耐摩耗性及び耐亀裂性に優れた航空タイヤが得られる航空タイヤ用ゴム組成物、該航空タイヤ用ゴム組成物を架橋してなる航空タイヤ用架橋ゴム組成物、及び該航空タイヤ用架橋ゴム組成物を用いてなる航空タイヤを提供することができる。
According to the present invention, a rubber composition for an aviation tire from which an aviation tire excellent in wear resistance and crack resistance is obtained, a crosslinked rubber composition for an aviation tire obtained by crosslinking the rubber composition for an aviation tire, and the An aviation tire using the crosslinked rubber composition for an aviation tire can be provided.
以下に、本発明をその実施形態に基づき詳細に例示説明する。なお、以下の説明において、数値範囲を示す「Ａ～Ｂ」の記載は、端点であるＡ及びＢを含む数値範囲を表し、Ａ＜Ｂの場合、「Ａ以上Ｂ以下」を表し、Ａ＞Ｂの場合、「Ａ以下Ｂ以上」を表す。
また、質量部及び質量％は、それぞれ、重量部及び重量％と同義である。 Hereinafter, the present invention will be described in detail based on the embodiments. In the following description, the description of “A to B” indicating a numerical range represents a numerical range including A and B as end points, and when A <B, it represents “A or more and B or less”, and A> In the case of B, it represents “A or less and B or more”.
Moreover, a mass part and mass% are synonymous with a weight part and weight%, respectively.
また、質量部及び質量％は、それぞれ、重量部及び重量％と同義である。 Hereinafter, the present invention will be described in detail based on the embodiments. In the following description, the description of “A to B” indicating a numerical range represents a numerical range including A and B as end points, and when A <B, it represents “A or more and B or less”, and A> In the case of B, it represents “A or less and B or more”.
Moreover, a mass part and mass% are synonymous with a weight part and weight%, respectively.
［航空タイヤ用ゴム組成物］
本発明の航空タイヤ用ゴム組成物（以下、単に「ゴム組成物」ともいう。）は、ジエンゴムを含むゴム成分を含有し、ゴム成分１００質量部に対する脂肪酸の含有量が０．５質量部未満であることを特徴とする。
本発明者は、航空タイヤでは、初期には耐摩耗性及び耐亀裂性に優れていても、使用により耐摩耗性及び耐亀裂性が劣化する場合があることを見出した。
鋭意検討した結果、ゴム組成物中の脂肪酸の含有量を低減することにより、上記の耐摩耗性及び耐亀裂性の劣化が抑制されることを見出し、本発明を完成するに至った。なお、本発明において、耐摩耗性及び耐亀裂性に優れるとは、初期のみならず、特に使用による高熱等での劣化後における耐摩耗性及び耐亀裂性が優れることを意味する。よって、乗用車用やトラック用のタイヤ以上に、航空タイヤに適用することで優れた効果を発揮すると考えられる。
以下、ゴム組成物を構成する各成分について説明する。 [Rubber composition for aviation tires]
The rubber composition for aviation tires of the present invention (hereinafter, also simply referred to as “rubber composition”) contains a rubber component containing a diene rubber, and the fatty acid content relative to 100 parts by mass of the rubber component is less than 0.5 parts by mass. It is characterized by being.
The present inventor has found that, in an aviation tire, although the wear resistance and crack resistance are excellent in the initial stage, the wear resistance and crack resistance may deteriorate due to use.
As a result of intensive studies, it has been found that by reducing the content of fatty acid in the rubber composition, the above-described deterioration of wear resistance and crack resistance is suppressed, and the present invention has been completed. In the present invention, being excellent in wear resistance and crack resistance means not only in the initial stage, but also excellent in wear resistance and crack resistance particularly after deterioration due to high heat or the like due to use. Therefore, it is considered that the superior effect is exhibited when applied to aviation tires over passenger car and truck tires.
Hereinafter, each component constituting the rubber composition will be described.
本発明の航空タイヤ用ゴム組成物（以下、単に「ゴム組成物」ともいう。）は、ジエンゴムを含むゴム成分を含有し、ゴム成分１００質量部に対する脂肪酸の含有量が０．５質量部未満であることを特徴とする。
本発明者は、航空タイヤでは、初期には耐摩耗性及び耐亀裂性に優れていても、使用により耐摩耗性及び耐亀裂性が劣化する場合があることを見出した。
鋭意検討した結果、ゴム組成物中の脂肪酸の含有量を低減することにより、上記の耐摩耗性及び耐亀裂性の劣化が抑制されることを見出し、本発明を完成するに至った。なお、本発明において、耐摩耗性及び耐亀裂性に優れるとは、初期のみならず、特に使用による高熱等での劣化後における耐摩耗性及び耐亀裂性が優れることを意味する。よって、乗用車用やトラック用のタイヤ以上に、航空タイヤに適用することで優れた効果を発揮すると考えられる。
以下、ゴム組成物を構成する各成分について説明する。 [Rubber composition for aviation tires]
The rubber composition for aviation tires of the present invention (hereinafter, also simply referred to as “rubber composition”) contains a rubber component containing a diene rubber, and the fatty acid content relative to 100 parts by mass of the rubber component is less than 0.5 parts by mass. It is characterized by being.
The present inventor has found that, in an aviation tire, although the wear resistance and crack resistance are excellent in the initial stage, the wear resistance and crack resistance may deteriorate due to use.
As a result of intensive studies, it has been found that by reducing the content of fatty acid in the rubber composition, the above-described deterioration of wear resistance and crack resistance is suppressed, and the present invention has been completed. In the present invention, being excellent in wear resistance and crack resistance means not only in the initial stage, but also excellent in wear resistance and crack resistance particularly after deterioration due to high heat or the like due to use. Therefore, it is considered that the superior effect is exhibited when applied to aviation tires over passenger car and truck tires.
Hereinafter, each component constituting the rubber composition will be described.
＜ゴム成分＞
本発明の航空タイヤ用ゴム組成物はゴム成分を含有し、該ゴム成分はジエンゴムを含有する。
ジエンゴムとしては、天然ゴム及び合成ジエンゴムが例示される。合成ジエンゴムとしては、ポリイソプレン（ＩＲ）、ブタジエンゴム（ポリブタジエン、ＢＲ）、スチレン－ブタジエンゴム（ＳＢＲ）、アクリロニトリル－ブタジエンゴム（ＮＢＲ）、クロロプレンゴム（ＣＲ）、ブチルゴム（ＩＩＲ）、ハロゲン化ブチルゴム（Ｘ－ＩＩＲ）、エチレン－プロピレンゴム（ＥＰＭ）、エチレン－プロピレン－ジエン系共重合体ゴム（ＥＰＤＭ）、スチレン－イソプレン－ブタジエン共重合体ゴム（ＳＩＢＲ）等が例示される。
なお、ゴム成分として、ジエンゴムに加え、アクリルゴム、エピクロロヒドリンゴム、シリコーンゴム、フッ素ゴム、ウレタンゴム等を含有していてもよい。
本発明において、ゴム成分中のジエンゴムの含有量は、好ましくは５０質量％以上、より好ましくは８０質量％以上、更に好ましくは９０質量％以上、より更に好ましくは１００質量％、すなわちゴム成分の全量がジエンゴムである。ゴム成分中のジエンゴムの含有量が上記範囲内であると、耐摩耗性及び耐亀裂性に優れたタイヤが得られるので好ましい。 <Rubber component>
The rubber composition for aviation tires of the present invention contains a rubber component, and the rubber component contains diene rubber.
Examples of the diene rubber include natural rubber and synthetic diene rubber. Synthetic diene rubbers include polyisoprene (IR), butadiene rubber (polybutadiene, BR), styrene-butadiene rubber (SBR), acrylonitrile-butadiene rubber (NBR), chloroprene rubber (CR), butyl rubber (IIR), halogenated butyl rubber ( X-IIR), ethylene-propylene rubber (EPM), ethylene-propylene-diene copolymer rubber (EPDM), styrene-isoprene-butadiene copolymer rubber (SIBR) and the like.
In addition to the diene rubber, the rubber component may contain acrylic rubber, epichlorohydrin rubber, silicone rubber, fluorine rubber, urethane rubber, or the like.
In the present invention, the content of the diene rubber in the rubber component is preferably 50% by mass or more, more preferably 80% by mass or more, still more preferably 90% by mass or more, still more preferably 100% by mass, that is, the total amount of the rubber component. Is diene rubber. When the diene rubber content in the rubber component is within the above range, a tire having excellent wear resistance and crack resistance is obtained, which is preferable.
本発明の航空タイヤ用ゴム組成物はゴム成分を含有し、該ゴム成分はジエンゴムを含有する。
ジエンゴムとしては、天然ゴム及び合成ジエンゴムが例示される。合成ジエンゴムとしては、ポリイソプレン（ＩＲ）、ブタジエンゴム（ポリブタジエン、ＢＲ）、スチレン－ブタジエンゴム（ＳＢＲ）、アクリロニトリル－ブタジエンゴム（ＮＢＲ）、クロロプレンゴム（ＣＲ）、ブチルゴム（ＩＩＲ）、ハロゲン化ブチルゴム（Ｘ－ＩＩＲ）、エチレン－プロピレンゴム（ＥＰＭ）、エチレン－プロピレン－ジエン系共重合体ゴム（ＥＰＤＭ）、スチレン－イソプレン－ブタジエン共重合体ゴム（ＳＩＢＲ）等が例示される。
なお、ゴム成分として、ジエンゴムに加え、アクリルゴム、エピクロロヒドリンゴム、シリコーンゴム、フッ素ゴム、ウレタンゴム等を含有していてもよい。
本発明において、ゴム成分中のジエンゴムの含有量は、好ましくは５０質量％以上、より好ましくは８０質量％以上、更に好ましくは９０質量％以上、より更に好ましくは１００質量％、すなわちゴム成分の全量がジエンゴムである。ゴム成分中のジエンゴムの含有量が上記範囲内であると、耐摩耗性及び耐亀裂性に優れたタイヤが得られるので好ましい。 <Rubber component>
The rubber composition for aviation tires of the present invention contains a rubber component, and the rubber component contains diene rubber.
Examples of the diene rubber include natural rubber and synthetic diene rubber. Synthetic diene rubbers include polyisoprene (IR), butadiene rubber (polybutadiene, BR), styrene-butadiene rubber (SBR), acrylonitrile-butadiene rubber (NBR), chloroprene rubber (CR), butyl rubber (IIR), halogenated butyl rubber ( X-IIR), ethylene-propylene rubber (EPM), ethylene-propylene-diene copolymer rubber (EPDM), styrene-isoprene-butadiene copolymer rubber (SIBR) and the like.
In addition to the diene rubber, the rubber component may contain acrylic rubber, epichlorohydrin rubber, silicone rubber, fluorine rubber, urethane rubber, or the like.
In the present invention, the content of the diene rubber in the rubber component is preferably 50% by mass or more, more preferably 80% by mass or more, still more preferably 90% by mass or more, still more preferably 100% by mass, that is, the total amount of the rubber component. Is diene rubber. When the diene rubber content in the rubber component is within the above range, a tire having excellent wear resistance and crack resistance is obtained, which is preferable.
本発明のゴム組成物は、ジエンゴムとして、天然ゴム、ポリイソプレン、及びブタジエンゴムよりなる群から選択される少なくとも１種を含むことが好ましく、天然ゴム及びポリイソプレンよりなる群から選択される少なくとも１種と、ブタジエンゴムとを有することがより好ましい。
ゴム成分中の天然ゴム及びポリイソプレンの合計含有量は、耐摩耗性及び耐亀裂性に優れたタイヤを得る観点から、好ましくは４０質量％以上、より好ましくは５５質量％以上、更に好ましくは７０質量％以上であり、また、好ましくは９５質量％以下、より好ましくは８５質量％以下である。
また、ゴム成分中のブタジエンゴムの含有量は、耐摩耗性及び耐亀裂性に優れた航空タイヤを得る観点から、好ましくは１０質量％以上、より好ましくは１５質量％以上であり、また、好ましくは６０質量％以下、より好ましくは４５質量％以下、更に好ましくは３０質量％以下である。 The rubber composition of the present invention preferably contains at least one selected from the group consisting of natural rubber, polyisoprene, and butadiene rubber as the diene rubber, and at least one selected from the group consisting of natural rubber and polyisoprene. More preferably, it has seeds and butadiene rubber.
The total content of natural rubber and polyisoprene in the rubber component is preferably 40% by mass or more, more preferably 55% by mass or more, and still more preferably 70%, from the viewpoint of obtaining a tire excellent in wear resistance and crack resistance. It is 95 mass% or less, Preferably it is 95 mass% or less, More preferably, it is 85 mass% or less.
Further, the content of the butadiene rubber in the rubber component is preferably 10% by mass or more, more preferably 15% by mass or more, from the viewpoint of obtaining an aviation tire excellent in wear resistance and crack resistance. Is 60% by mass or less, more preferably 45% by mass or less, and still more preferably 30% by mass or less.
ゴム成分中の天然ゴム及びポリイソプレンの合計含有量は、耐摩耗性及び耐亀裂性に優れたタイヤを得る観点から、好ましくは４０質量％以上、より好ましくは５５質量％以上、更に好ましくは７０質量％以上であり、また、好ましくは９５質量％以下、より好ましくは８５質量％以下である。
また、ゴム成分中のブタジエンゴムの含有量は、耐摩耗性及び耐亀裂性に優れた航空タイヤを得る観点から、好ましくは１０質量％以上、より好ましくは１５質量％以上であり、また、好ましくは６０質量％以下、より好ましくは４５質量％以下、更に好ましくは３０質量％以下である。 The rubber composition of the present invention preferably contains at least one selected from the group consisting of natural rubber, polyisoprene, and butadiene rubber as the diene rubber, and at least one selected from the group consisting of natural rubber and polyisoprene. More preferably, it has seeds and butadiene rubber.
The total content of natural rubber and polyisoprene in the rubber component is preferably 40% by mass or more, more preferably 55% by mass or more, and still more preferably 70%, from the viewpoint of obtaining a tire excellent in wear resistance and crack resistance. It is 95 mass% or less, Preferably it is 95 mass% or less, More preferably, it is 85 mass% or less.
Further, the content of the butadiene rubber in the rubber component is preferably 10% by mass or more, more preferably 15% by mass or more, from the viewpoint of obtaining an aviation tire excellent in wear resistance and crack resistance. Is 60% by mass or less, more preferably 45% by mass or less, and still more preferably 30% by mass or less.
本発明において、ブタジエンゴムとして、シス１，４－結合量が９２％以上であるブタジエンゴムを使用してもよい。シス１，４－結合量は、９５％以上であることがより好ましく、９８％以上であることが更に好ましい。また、当該ブタジエンゴムの重量平均分子量は、好ましくは１×１０４～１×１０７、より好ましくは３×１０４～１×１０６、更に好ましくは５×１０４～６×１０５である。なお、重量平均分子量は、ＧＰＣ（ゲルパーミエーションクロマトグラフィ）により測定され、標準ポリスチレンで換算した値である。
In the present invention, a butadiene rubber having a cis 1,4-bond amount of 92% or more may be used as the butadiene rubber. The amount of cis 1,4-bond is more preferably 95% or more, and still more preferably 98% or more. The weight average molecular weight of the butadiene rubber is preferably 1 × 10 4 to 1 × 10 7 , more preferably 3 × 10 4 to 1 × 10 6 , and still more preferably 5 × 10 4 to 6 × 10 5 . . The weight average molecular weight is a value measured by GPC (gel permeation chromatography) and converted to standard polystyrene.
＜脂肪酸＞
本発明の航空タイヤ用ゴム組成物において、ゴム成分１００質量部に対する脂肪酸の含有量は、０．５質量部未満である。脂肪酸の含有量が０．５質量部以上であると、耐摩耗性及び耐亀裂性の劣化を抑制することができない。なお、脂肪酸の含有量とは、脂肪酸自体の含有量であり、後述する脂肪酸金属塩中の脂肪酸の含有量を含むものではない。
上記脂肪酸は、Ｒ－ＣＯＯＨで表される化合物であり、Ｒは、炭素数６～３０の脂肪族基であることが好ましく、直鎖又は分岐鎖の、飽和又は不飽和の脂肪族基であることがより好ましい。
脂肪酸としては、具体的にはパルミチン酸、ステアリン酸、カプロン酸、カプリル酸、カプリン酸、ラウリン酸、ミリスチン酸、アラキジン酸、ベヘニン酸、セロチン酸、モンタン酸、メリシン酸、ペラルゴン酸等の飽和脂肪酸；ゾーマリン酸、ペトロセリン酸、オレイン酸、エルシン酸、鯨油酸、バクセン酸、リノール酸、エレオステアリン酸、モロクチ酸、バリナリン酸、イワシ酸、ヒラガシラ酸、ニシン酸、リシノール酸、ラウロレイン酸、エライジン酸、エルカ酸、リノエライジン酸、リノレン酸、アラキドン酸等の不飽和脂肪酸が例示される。 <Fatty acid>
In the rubber composition for an aviation tire according to the present invention, the content of the fatty acid with respect to 100 parts by mass of the rubber component is less than 0.5 parts by mass. When the content of the fatty acid is 0.5 parts by mass or more, deterioration of wear resistance and crack resistance cannot be suppressed. In addition, content of a fatty acid is content of fatty acid itself, and does not include content of the fatty acid in the fatty acid metal salt mentioned later.
The fatty acid is a compound represented by R—COOH, and R is preferably an aliphatic group having 6 to 30 carbon atoms, and is a linear or branched, saturated or unsaturated aliphatic group. It is more preferable.
Specific examples of fatty acids include saturated fatty acids such as palmitic acid, stearic acid, caproic acid, caprylic acid, capric acid, lauric acid, myristic acid, arachidic acid, behenic acid, serotic acid, montanic acid, melicic acid, and pelargonic acid. Zomarinic acid, petroceric acid, oleic acid, erucic acid, whale oil acid, vaccenic acid, linoleic acid, eleostearic acid, moloctic acid, valinalic acid, sardine acid, hiragasiraic acid, nisinic acid, ricinoleic acid, lauroleic acid, elaidic acid And unsaturated fatty acids such as erucic acid, linoelaidic acid, linolenic acid and arachidonic acid.
本発明の航空タイヤ用ゴム組成物において、ゴム成分１００質量部に対する脂肪酸の含有量は、０．５質量部未満である。脂肪酸の含有量が０．５質量部以上であると、耐摩耗性及び耐亀裂性の劣化を抑制することができない。なお、脂肪酸の含有量とは、脂肪酸自体の含有量であり、後述する脂肪酸金属塩中の脂肪酸の含有量を含むものではない。
上記脂肪酸は、Ｒ－ＣＯＯＨで表される化合物であり、Ｒは、炭素数６～３０の脂肪族基であることが好ましく、直鎖又は分岐鎖の、飽和又は不飽和の脂肪族基であることがより好ましい。
脂肪酸としては、具体的にはパルミチン酸、ステアリン酸、カプロン酸、カプリル酸、カプリン酸、ラウリン酸、ミリスチン酸、アラキジン酸、ベヘニン酸、セロチン酸、モンタン酸、メリシン酸、ペラルゴン酸等の飽和脂肪酸；ゾーマリン酸、ペトロセリン酸、オレイン酸、エルシン酸、鯨油酸、バクセン酸、リノール酸、エレオステアリン酸、モロクチ酸、バリナリン酸、イワシ酸、ヒラガシラ酸、ニシン酸、リシノール酸、ラウロレイン酸、エライジン酸、エルカ酸、リノエライジン酸、リノレン酸、アラキドン酸等の不飽和脂肪酸が例示される。 <Fatty acid>
In the rubber composition for an aviation tire according to the present invention, the content of the fatty acid with respect to 100 parts by mass of the rubber component is less than 0.5 parts by mass. When the content of the fatty acid is 0.5 parts by mass or more, deterioration of wear resistance and crack resistance cannot be suppressed. In addition, content of a fatty acid is content of fatty acid itself, and does not include content of the fatty acid in the fatty acid metal salt mentioned later.
The fatty acid is a compound represented by R—COOH, and R is preferably an aliphatic group having 6 to 30 carbon atoms, and is a linear or branched, saturated or unsaturated aliphatic group. It is more preferable.
Specific examples of fatty acids include saturated fatty acids such as palmitic acid, stearic acid, caproic acid, caprylic acid, capric acid, lauric acid, myristic acid, arachidic acid, behenic acid, serotic acid, montanic acid, melicic acid, and pelargonic acid. Zomarinic acid, petroceric acid, oleic acid, erucic acid, whale oil acid, vaccenic acid, linoleic acid, eleostearic acid, moloctic acid, valinalic acid, sardine acid, hiragasiraic acid, nisinic acid, ricinoleic acid, lauroleic acid, elaidic acid And unsaturated fatty acids such as erucic acid, linoelaidic acid, linolenic acid and arachidonic acid.
ゴム成分１００質量部に対する脂肪酸の含有量は、０．５質量部未満であり、０．３質量部以下であることが好ましく、０．１質量部以下であることがより好ましく、０．０３質量部以下であることが更に好ましく、実質的に含有しないことがより更に好ましい。
ここで、「実質的に含有しない」とは、ゴム成分１００質量部に対する脂肪酸の含有量が０．０１質量部以下であることを意味する。
本発明において、脂肪酸を配合しないことが好ましいが、少量の脂肪酸が不純物として存在することを排除するものではない。 The content of the fatty acid relative to 100 parts by mass of the rubber component is less than 0.5 parts by mass, preferably 0.3 parts by mass or less, more preferably 0.1 parts by mass or less, and 0.03 parts by mass. It is more preferable that the amount is not more than part, and it is even more preferable that the content is not substantially contained.
Here, “substantially does not contain” means that the content of fatty acid with respect to 100 parts by mass of the rubber component is 0.01 parts by mass or less.
In the present invention, it is preferable not to add a fatty acid, but this does not exclude the presence of a small amount of fatty acid as an impurity.
ここで、「実質的に含有しない」とは、ゴム成分１００質量部に対する脂肪酸の含有量が０．０１質量部以下であることを意味する。
本発明において、脂肪酸を配合しないことが好ましいが、少量の脂肪酸が不純物として存在することを排除するものではない。 The content of the fatty acid relative to 100 parts by mass of the rubber component is less than 0.5 parts by mass, preferably 0.3 parts by mass or less, more preferably 0.1 parts by mass or less, and 0.03 parts by mass. It is more preferable that the amount is not more than part, and it is even more preferable that the content is not substantially contained.
Here, “substantially does not contain” means that the content of fatty acid with respect to 100 parts by mass of the rubber component is 0.01 parts by mass or less.
In the present invention, it is preferable not to add a fatty acid, but this does not exclude the presence of a small amount of fatty acid as an impurity.
＜酸化亜鉛＞
本発明の航空タイヤ用ゴム組成物は、酸化亜鉛を含有してもよく、酸化亜鉛を含有することが好ましい。
ここで、酸化亜鉛は、亜鉛華とも呼ばれ、化学式ＺｎＯで表される亜鉛の酸化物である。酸化亜鉛は、比表面積が大きな、所謂活性酸化亜鉛（活性亜鉛華）とすることで、より熱劣化後における耐摩耗性及び耐亀裂性が優れるため好ましい。なお、活性酸化亜鉛とは、ＪＩＳ Ｚ ８８３０：２０１３に準拠して、窒素を吸着質としたＢＥＴ法により測定される比表面積（ＢＥＴ比表面積）が１０ｍ２／ｇ以上の酸化亜鉛である。
本発明において、ゴム成分１００質量部に対する酸化亜鉛の含有量は、耐摩耗性及び耐亀裂性の劣化を抑制する観点から、好ましくは４質量部以下、より好ましくは３．５質量部以下、更に好ましくは３質量部以下、より更に好ましくは２．５質量部以下である。また、架橋性に優れ、剛性に優れた架橋ゴム組成物を得る観点から、ゴム成分１００質量部に対する酸化亜鉛の含有量は、好ましくは０．５質量部以上、より好ましくは１質量部以上、更に好ましくは１．５質量部以上である。 <Zinc oxide>
The rubber composition for aviation tires of the present invention may contain zinc oxide, and preferably contains zinc oxide.
Here, zinc oxide is also called zinc white and is an oxide of zinc represented by the chemical formula ZnO. Zinc oxide is preferably so-called activated zinc oxide (activated zinc white) having a large specific surface area because it is more excellent in wear resistance and crack resistance after thermal degradation. The active zinc oxide is zinc oxide having a specific surface area (BET specific surface area) measured by a BET method using nitrogen as an adsorbate in accordance with JIS Z 8830: 2013 of 10 m 2 / g or more.
In the present invention, the content of zinc oxide with respect to 100 parts by mass of the rubber component is preferably 4 parts by mass or less, more preferably 3.5 parts by mass or less, from the viewpoint of suppressing deterioration of wear resistance and crack resistance. Preferably it is 3 mass parts or less, More preferably, it is 2.5 mass parts or less. Further, from the viewpoint of obtaining a crosslinked rubber composition having excellent crosslinkability and excellent rigidity, the content of zinc oxide with respect to 100 parts by mass of the rubber component is preferably 0.5 parts by mass or more, more preferably 1 part by mass or more, More preferably, it is 1.5 parts by mass or more.
本発明の航空タイヤ用ゴム組成物は、酸化亜鉛を含有してもよく、酸化亜鉛を含有することが好ましい。
ここで、酸化亜鉛は、亜鉛華とも呼ばれ、化学式ＺｎＯで表される亜鉛の酸化物である。酸化亜鉛は、比表面積が大きな、所謂活性酸化亜鉛（活性亜鉛華）とすることで、より熱劣化後における耐摩耗性及び耐亀裂性が優れるため好ましい。なお、活性酸化亜鉛とは、ＪＩＳ Ｚ ８８３０：２０１３に準拠して、窒素を吸着質としたＢＥＴ法により測定される比表面積（ＢＥＴ比表面積）が１０ｍ２／ｇ以上の酸化亜鉛である。
本発明において、ゴム成分１００質量部に対する酸化亜鉛の含有量は、耐摩耗性及び耐亀裂性の劣化を抑制する観点から、好ましくは４質量部以下、より好ましくは３．５質量部以下、更に好ましくは３質量部以下、より更に好ましくは２．５質量部以下である。また、架橋性に優れ、剛性に優れた架橋ゴム組成物を得る観点から、ゴム成分１００質量部に対する酸化亜鉛の含有量は、好ましくは０．５質量部以上、より好ましくは１質量部以上、更に好ましくは１．５質量部以上である。 <Zinc oxide>
The rubber composition for aviation tires of the present invention may contain zinc oxide, and preferably contains zinc oxide.
Here, zinc oxide is also called zinc white and is an oxide of zinc represented by the chemical formula ZnO. Zinc oxide is preferably so-called activated zinc oxide (activated zinc white) having a large specific surface area because it is more excellent in wear resistance and crack resistance after thermal degradation. The active zinc oxide is zinc oxide having a specific surface area (BET specific surface area) measured by a BET method using nitrogen as an adsorbate in accordance with JIS Z 8830: 2013 of 10 m 2 / g or more.
In the present invention, the content of zinc oxide with respect to 100 parts by mass of the rubber component is preferably 4 parts by mass or less, more preferably 3.5 parts by mass or less, from the viewpoint of suppressing deterioration of wear resistance and crack resistance. Preferably it is 3 mass parts or less, More preferably, it is 2.5 mass parts or less. Further, from the viewpoint of obtaining a crosslinked rubber composition having excellent crosslinkability and excellent rigidity, the content of zinc oxide with respect to 100 parts by mass of the rubber component is preferably 0.5 parts by mass or more, more preferably 1 part by mass or more, More preferably, it is 1.5 parts by mass or more.
本発明において、ゴム成分１００質量部に対する酸化亜鉛及び脂肪酸の合計含有量は、好ましくは４質量部以下、より好ましくは３．５質量部以下、更に好ましくは３質量部以下である。
また、ゴム成分１００質量部に対する酸化亜鉛及び脂肪酸の合計含有量は、好ましくは０．５質量部以上、より好ましくは１質量部以上、更に好ましくは１．５質量部以上、より更に好ましくは２質量部以上である。
酸化亜鉛及び脂肪酸の合計含有量が上記範囲内であると、剛性に優れ、かつ、耐摩耗性及び耐亀裂性の劣化が抑制された航空タイヤ用架橋ゴム組成物及び航空タイヤが得られる。 In the present invention, the total content of zinc oxide and fatty acid with respect to 100 parts by mass of the rubber component is preferably 4 parts by mass or less, more preferably 3.5 parts by mass or less, and still more preferably 3 parts by mass or less.
The total content of zinc oxide and fatty acid with respect to 100 parts by mass of the rubber component is preferably 0.5 parts by mass or more, more preferably 1 part by mass or more, still more preferably 1.5 parts by mass or more, and still more preferably 2 parts. More than part by mass.
When the total content of zinc oxide and fatty acid is within the above range, a crosslinked rubber composition for an aviation tire and an aviation tire having excellent rigidity and suppressed deterioration of wear resistance and crack resistance are obtained.
また、ゴム成分１００質量部に対する酸化亜鉛及び脂肪酸の合計含有量は、好ましくは０．５質量部以上、より好ましくは１質量部以上、更に好ましくは１．５質量部以上、より更に好ましくは２質量部以上である。
酸化亜鉛及び脂肪酸の合計含有量が上記範囲内であると、剛性に優れ、かつ、耐摩耗性及び耐亀裂性の劣化が抑制された航空タイヤ用架橋ゴム組成物及び航空タイヤが得られる。 In the present invention, the total content of zinc oxide and fatty acid with respect to 100 parts by mass of the rubber component is preferably 4 parts by mass or less, more preferably 3.5 parts by mass or less, and still more preferably 3 parts by mass or less.
The total content of zinc oxide and fatty acid with respect to 100 parts by mass of the rubber component is preferably 0.5 parts by mass or more, more preferably 1 part by mass or more, still more preferably 1.5 parts by mass or more, and still more preferably 2 parts. More than part by mass.
When the total content of zinc oxide and fatty acid is within the above range, a crosslinked rubber composition for an aviation tire and an aviation tire having excellent rigidity and suppressed deterioration of wear resistance and crack resistance are obtained.
本発明において、ゴム組成物が酸化亜鉛を含有し、脂肪酸の含有量に対する酸化亜鉛の含有量の質量比（酸化亜鉛／脂肪酸）が３以上であることが好ましい。５以上であることがより好ましく、１０以上であることが更に好ましく、３０以上であることがより更に好ましい。
脂肪酸の含有量に対する酸化亜鉛の含有量の質量比が上記範囲内であると、耐摩耗性及び耐亀裂性の劣化がより抑制された航空タイヤ用架橋ゴム組成物及び航空タイヤが得られる。 In the present invention, the rubber composition preferably contains zinc oxide, and the mass ratio of the zinc oxide content to the fatty acid content (zinc oxide / fatty acid) is preferably 3 or more. It is more preferably 5 or more, still more preferably 10 or more, and still more preferably 30 or more.
When the mass ratio of the content of zinc oxide to the content of fatty acid is within the above range, a crosslinked rubber composition for an aviation tire and an aviation tire in which deterioration of wear resistance and crack resistance is further suppressed can be obtained.
脂肪酸の含有量に対する酸化亜鉛の含有量の質量比が上記範囲内であると、耐摩耗性及び耐亀裂性の劣化がより抑制された航空タイヤ用架橋ゴム組成物及び航空タイヤが得られる。 In the present invention, the rubber composition preferably contains zinc oxide, and the mass ratio of the zinc oxide content to the fatty acid content (zinc oxide / fatty acid) is preferably 3 or more. It is more preferably 5 or more, still more preferably 10 or more, and still more preferably 30 or more.
When the mass ratio of the content of zinc oxide to the content of fatty acid is within the above range, a crosslinked rubber composition for an aviation tire and an aviation tire in which deterioration of wear resistance and crack resistance is further suppressed can be obtained.
耐摩耗性及び耐亀裂性の劣化を抑制する観点から、酸化亜鉛の比表面積は４ｍ２／ｇ以上であることが好ましく、１０ｍ２／ｇ以上であることがより好ましく、２０ｍ２／ｇ以上であることが更に好ましい。
From the viewpoint of suppressing deterioration of wear resistance and crack resistance, the specific surface area of zinc oxide is preferably 4 m 2 / g or more, more preferably 10 m 2 / g or more, and 20 m 2 / g or more. More preferably it is.
＜脂肪酸金属塩＞
本発明のゴム組成物は、脂肪酸金属塩を含有することが好ましい。
脂肪酸金属塩としては、飽和脂肪酸の金属塩、不飽和脂肪酸の金属塩、又はそれらの混合物を用いることができる。具体的には、脂肪酸金属塩としては、パルミチン酸、ステアリン酸、カプロン酸、カプリル酸、カプリン酸、ラウリン酸、ミリスチン酸、アラキジン酸、ベヘニン酸、セロチン酸、モンタン酸、メリシン酸等の飽和脂肪酸の金属塩；ゾーマリン酸、ペトロセリン酸、オレイン酸、エルシン酸、鯨油酸、リノール酸、エレオステアリン酸、モロクチ酸、バリナリン酸、イワシ酸、ヒラガシラ酸、ニシン酸、リシノール酸、ラウロレイン酸、エライジン酸、エルカ酸、リノエライジン酸、リノレン酸、アラキドン酸等の不飽和脂肪酸の金属塩が挙げられる。
上述した飽和脂肪酸又は不飽和脂肪酸と金属塩を形成する金属元素としては、Ｋ、Ｃａ、Ｎａ、Ｍｇ、Ｚｎ、Ｃｏ、Ｎｉ、Ｂａ、Ｆｅ、Ａｌ、Ｃｕ及びＭｎよりなる群から選択された少なくとも１種の金属元素が挙げられ、Ｚｎ、Ｋ、及びＣａよりなる群から選択された少なくとも１種の金属元素が好ましく、Ｚｎ（亜鉛）がより好ましい。従って、脂肪酸金属塩は、脂肪酸亜鉛であることが特に好ましい。 <Fatty acid metal salt>
The rubber composition of the present invention preferably contains a fatty acid metal salt.
As the fatty acid metal salt, a metal salt of a saturated fatty acid, a metal salt of an unsaturated fatty acid, or a mixture thereof can be used. Specifically, fatty acid metal salts include saturated fatty acids such as palmitic acid, stearic acid, caproic acid, caprylic acid, capric acid, lauric acid, myristic acid, arachidic acid, behenic acid, serotic acid, montanic acid, and melicic acid. Metal salts of: zomarinic acid, petroceric acid, oleic acid, erucic acid, whale oil acid, linoleic acid, eleostearic acid, moloctic acid, valinalic acid, sardine acid, hiragasic acid, nisinic acid, ricinoleic acid, lauroleic acid, elaidic acid , Metal salts of unsaturated fatty acids such as erucic acid, linoelaidic acid, linolenic acid and arachidonic acid.
The metal element that forms the metal salt with the saturated fatty acid or unsaturated fatty acid described above is at least selected from the group consisting of K, Ca, Na, Mg, Zn, Co, Ni, Ba, Fe, Al, Cu, and Mn. One type of metal element is mentioned, and at least one type of metal element selected from the group consisting of Zn, K, and Ca is preferable, and Zn (zinc) is more preferable. Therefore, the fatty acid metal salt is particularly preferably fatty acid zinc.
本発明のゴム組成物は、脂肪酸金属塩を含有することが好ましい。
脂肪酸金属塩としては、飽和脂肪酸の金属塩、不飽和脂肪酸の金属塩、又はそれらの混合物を用いることができる。具体的には、脂肪酸金属塩としては、パルミチン酸、ステアリン酸、カプロン酸、カプリル酸、カプリン酸、ラウリン酸、ミリスチン酸、アラキジン酸、ベヘニン酸、セロチン酸、モンタン酸、メリシン酸等の飽和脂肪酸の金属塩；ゾーマリン酸、ペトロセリン酸、オレイン酸、エルシン酸、鯨油酸、リノール酸、エレオステアリン酸、モロクチ酸、バリナリン酸、イワシ酸、ヒラガシラ酸、ニシン酸、リシノール酸、ラウロレイン酸、エライジン酸、エルカ酸、リノエライジン酸、リノレン酸、アラキドン酸等の不飽和脂肪酸の金属塩が挙げられる。
上述した飽和脂肪酸又は不飽和脂肪酸と金属塩を形成する金属元素としては、Ｋ、Ｃａ、Ｎａ、Ｍｇ、Ｚｎ、Ｃｏ、Ｎｉ、Ｂａ、Ｆｅ、Ａｌ、Ｃｕ及びＭｎよりなる群から選択された少なくとも１種の金属元素が挙げられ、Ｚｎ、Ｋ、及びＣａよりなる群から選択された少なくとも１種の金属元素が好ましく、Ｚｎ（亜鉛）がより好ましい。従って、脂肪酸金属塩は、脂肪酸亜鉛であることが特に好ましい。 <Fatty acid metal salt>
The rubber composition of the present invention preferably contains a fatty acid metal salt.
As the fatty acid metal salt, a metal salt of a saturated fatty acid, a metal salt of an unsaturated fatty acid, or a mixture thereof can be used. Specifically, fatty acid metal salts include saturated fatty acids such as palmitic acid, stearic acid, caproic acid, caprylic acid, capric acid, lauric acid, myristic acid, arachidic acid, behenic acid, serotic acid, montanic acid, and melicic acid. Metal salts of: zomarinic acid, petroceric acid, oleic acid, erucic acid, whale oil acid, linoleic acid, eleostearic acid, moloctic acid, valinalic acid, sardine acid, hiragasic acid, nisinic acid, ricinoleic acid, lauroleic acid, elaidic acid , Metal salts of unsaturated fatty acids such as erucic acid, linoelaidic acid, linolenic acid and arachidonic acid.
The metal element that forms the metal salt with the saturated fatty acid or unsaturated fatty acid described above is at least selected from the group consisting of K, Ca, Na, Mg, Zn, Co, Ni, Ba, Fe, Al, Cu, and Mn. One type of metal element is mentioned, and at least one type of metal element selected from the group consisting of Zn, K, and Ca is preferable, and Zn (zinc) is more preferable. Therefore, the fatty acid metal salt is particularly preferably fatty acid zinc.
脂肪酸金属塩として好ましくは、炭素８～１８のモノ脂肪酸の金属塩が挙げられ、具体的には、カプリル酸亜鉛、ペラルゴン酸亜鉛、カプリン酸亜鉛、ラウリン酸亜鉛、ミリスチン酸亜鉛、パルミチン酸亜鉛、ステアリン酸亜鉛、オレイン酸亜鉛、リノール酸亜鉛等が好ましく例示される。これらの中でも、ステアリン酸亜鉛、オレイン酸亜鉛、パルミチン酸亜鉛がより好ましく例示される。
The fatty acid metal salt is preferably a metal salt of a monofatty acid having 8 to 18 carbon atoms, specifically, zinc caprylate, zinc pelargonate, zinc caprate, zinc laurate, zinc myristate, zinc palmitate, Preferred examples include zinc stearate, zinc oleate, and zinc linoleate. Among these, zinc stearate, zinc oleate, and zinc palmitate are more preferably exemplified.
脂肪酸金属塩としては、上市されている製品を使用してもよく、具体的には、Ａｋｔｉｐｌａｓｔシリーズ（ラインケミー社製、具体的には、Ａｋｔｉｐｌａｓｔ ＰＰ（主成分は、オレイン酸亜鉛及びパルミチン酸亜鉛））、ＵＬＴＲＡＬＦＯＷシリーズ（パフォーマンスアディティブス社製）、ＳＴＲＵＫＴＯＬ Ａ５０Ｐ（Ｓｔｒｕｃｔｏｌ社製）、エクストンＬ－２－Ｇ（川口化学工業株式会社製）等が例示される。
Commercially available products may be used as the fatty acid metal salt. Specifically, Aktiplast series (manufactured by Rhein Chemie, specifically Aktiplast PP (main components are zinc oleate and zinc palmitate) ), ULTRALFOW series (manufactured by Performance Additives), STRUKTOL A50P (manufactured by Structol), Exton L-2-G (manufactured by Kawaguchi Chemical Industry Co., Ltd.), and the like.
脂肪酸金属塩は、１種単独で用いてもよく、２種以上を併用してもよい。
耐摩耗性及び耐亀裂性の劣化を抑制する観点から、ゴム成分１００質量部に対する脂肪酸金属塩の含有量は、好ましくは３質量部以下、より好ましくは２．５質量部以下、更に好ましくは２質量部以下であり、そして、同様の観点から、好ましくは０．５質量部以上、より好ましくは１質量部以上である。 A fatty acid metal salt may be used individually by 1 type, and may use 2 or more types together.
From the viewpoint of suppressing deterioration of wear resistance and crack resistance, the content of the fatty acid metal salt with respect to 100 parts by mass of the rubber component is preferably 3 parts by mass or less, more preferably 2.5 parts by mass or less, and even more preferably 2 parts. From the same viewpoint, it is preferably 0.5 parts by mass or more, more preferably 1 part by mass or more.
耐摩耗性及び耐亀裂性の劣化を抑制する観点から、ゴム成分１００質量部に対する脂肪酸金属塩の含有量は、好ましくは３質量部以下、より好ましくは２．５質量部以下、更に好ましくは２質量部以下であり、そして、同様の観点から、好ましくは０．５質量部以上、より好ましくは１質量部以上である。 A fatty acid metal salt may be used individually by 1 type, and may use 2 or more types together.
From the viewpoint of suppressing deterioration of wear resistance and crack resistance, the content of the fatty acid metal salt with respect to 100 parts by mass of the rubber component is preferably 3 parts by mass or less, more preferably 2.5 parts by mass or less, and even more preferably 2 parts. From the same viewpoint, it is preferably 0.5 parts by mass or more, more preferably 1 part by mass or more.
＜カーボンブラック＞
本発明のゴム組成物は、耐摩耗性及び耐亀裂性を向上させる観点から、カーボンブラックを含有することが好ましい。カーボンブラックとしては、ゴム組成物、特に、タイヤ用のゴム組成物に使用されている公知のカーボンブラックから適宜選択して使用すればよい。
カーボンブラックは１種単独で使用しても、２種以上を併用してもよい。
ゴム成分１００質量部に対するカーボンブラックの含有量は、耐摩耗性及び耐亀裂性向上の観点から、好ましくは２０～８０質量部、より好ましくは３０～７０質量部、更に好ましくは４０～６０質量部である。 <Carbon black>
The rubber composition of the present invention preferably contains carbon black from the viewpoint of improving wear resistance and crack resistance. The carbon black may be appropriately selected from known carbon blacks used in rubber compositions, particularly tire rubber compositions.
Carbon black may be used alone or in combination of two or more.
The content of carbon black with respect to 100 parts by mass of the rubber component is preferably 20 to 80 parts by mass, more preferably 30 to 70 parts by mass, and further preferably 40 to 60 parts by mass from the viewpoint of improving wear resistance and crack resistance. It is.
本発明のゴム組成物は、耐摩耗性及び耐亀裂性を向上させる観点から、カーボンブラックを含有することが好ましい。カーボンブラックとしては、ゴム組成物、特に、タイヤ用のゴム組成物に使用されている公知のカーボンブラックから適宜選択して使用すればよい。
カーボンブラックは１種単独で使用しても、２種以上を併用してもよい。
ゴム成分１００質量部に対するカーボンブラックの含有量は、耐摩耗性及び耐亀裂性向上の観点から、好ましくは２０～８０質量部、より好ましくは３０～７０質量部、更に好ましくは４０～６０質量部である。 <Carbon black>
The rubber composition of the present invention preferably contains carbon black from the viewpoint of improving wear resistance and crack resistance. The carbon black may be appropriately selected from known carbon blacks used in rubber compositions, particularly tire rubber compositions.
Carbon black may be used alone or in combination of two or more.
The content of carbon black with respect to 100 parts by mass of the rubber component is preferably 20 to 80 parts by mass, more preferably 30 to 70 parts by mass, and further preferably 40 to 60 parts by mass from the viewpoint of improving wear resistance and crack resistance. It is.
＜架橋剤＞
本発明のゴム組成物は、架橋して使用することが好ましいことから、架橋剤を含有することが好ましい。
架橋剤としては、硫黄系架橋剤、有機過酸化物系架橋剤、無機架橋剤、ポリアミン架橋剤、樹脂架橋剤、オキシム－ニトロソアミン系架橋剤等が挙げられる。これらの中でも、硫黄系架橋剤が好ましく、硫黄がより好ましい。
架橋剤は、１種単独で使用してもよく、２種以上を併用してもよい。
上記架橋剤の含有量としては特に制限はないが、架橋が十分に進行すると共に、混練り中の架橋を抑制する観点から、ゴム成分１００質量部に対して、好ましくは０．１～２０質量部、より好ましくは０．５～５質量部である。 <Crosslinking agent>
Since the rubber composition of the present invention is preferably used after being crosslinked, it preferably contains a crosslinking agent.
Examples of the crosslinking agent include a sulfur-based crosslinking agent, an organic peroxide-based crosslinking agent, an inorganic crosslinking agent, a polyamine crosslinking agent, a resin crosslinking agent, and an oxime-nitrosamine-based crosslinking agent. Among these, a sulfur type crosslinking agent is preferable and sulfur is more preferable.
A crosslinking agent may be used individually by 1 type, and may use 2 or more types together.
The content of the crosslinking agent is not particularly limited, but preferably 0.1 to 20 parts by mass with respect to 100 parts by mass of the rubber component from the viewpoint of sufficiently proceeding crosslinking and suppressing crosslinking during kneading. Part, more preferably 0.5 to 5 parts by weight.
本発明のゴム組成物は、架橋して使用することが好ましいことから、架橋剤を含有することが好ましい。
架橋剤としては、硫黄系架橋剤、有機過酸化物系架橋剤、無機架橋剤、ポリアミン架橋剤、樹脂架橋剤、オキシム－ニトロソアミン系架橋剤等が挙げられる。これらの中でも、硫黄系架橋剤が好ましく、硫黄がより好ましい。
架橋剤は、１種単独で使用してもよく、２種以上を併用してもよい。
上記架橋剤の含有量としては特に制限はないが、架橋が十分に進行すると共に、混練り中の架橋を抑制する観点から、ゴム成分１００質量部に対して、好ましくは０．１～２０質量部、より好ましくは０．５～５質量部である。 <Crosslinking agent>
Since the rubber composition of the present invention is preferably used after being crosslinked, it preferably contains a crosslinking agent.
Examples of the crosslinking agent include a sulfur-based crosslinking agent, an organic peroxide-based crosslinking agent, an inorganic crosslinking agent, a polyamine crosslinking agent, a resin crosslinking agent, and an oxime-nitrosamine-based crosslinking agent. Among these, a sulfur type crosslinking agent is preferable and sulfur is more preferable.
A crosslinking agent may be used individually by 1 type, and may use 2 or more types together.
The content of the crosslinking agent is not particularly limited, but preferably 0.1 to 20 parts by mass with respect to 100 parts by mass of the rubber component from the viewpoint of sufficiently proceeding crosslinking and suppressing crosslinking during kneading. Part, more preferably 0.5 to 5 parts by weight.
＜その他の成分＞
本発明のゴム組成物は、上記の成分に加え、必要に応じて、カーボンブラック以外の無機充填剤（例えば、シリカ等）、加硫促進剤、補強剤、軟化剤、加硫助剤、着色剤、難燃剤、滑剤、発泡剤、可塑剤、加工助剤、酸化防止剤、老化防止剤、スコーチ防止剤、紫外線吸収剤、帯電防止剤、着色防止剤、その他の配合剤等の公知の化合物を、その目的に応じて適宜採用することができる。 <Other ingredients>
In addition to the above components, the rubber composition of the present invention may contain an inorganic filler other than carbon black (for example, silica), a vulcanization accelerator, a reinforcing agent, a softening agent, a vulcanization aid, and coloring as necessary. Known compounds such as additives, flame retardants, lubricants, foaming agents, plasticizers, processing aids, antioxidants, anti-aging agents, anti-scorching agents, UV absorbers, antistatic agents, anti-coloring agents, and other compounding agents Can be appropriately employed depending on the purpose.
本発明のゴム組成物は、上記の成分に加え、必要に応じて、カーボンブラック以外の無機充填剤（例えば、シリカ等）、加硫促進剤、補強剤、軟化剤、加硫助剤、着色剤、難燃剤、滑剤、発泡剤、可塑剤、加工助剤、酸化防止剤、老化防止剤、スコーチ防止剤、紫外線吸収剤、帯電防止剤、着色防止剤、その他の配合剤等の公知の化合物を、その目的に応じて適宜採用することができる。 <Other ingredients>
In addition to the above components, the rubber composition of the present invention may contain an inorganic filler other than carbon black (for example, silica), a vulcanization accelerator, a reinforcing agent, a softening agent, a vulcanization aid, and coloring as necessary. Known compounds such as additives, flame retardants, lubricants, foaming agents, plasticizers, processing aids, antioxidants, anti-aging agents, anti-scorching agents, UV absorbers, antistatic agents, anti-coloring agents, and other compounding agents Can be appropriately employed depending on the purpose.
＜航空タイヤ用ゴム組成物の製造方法＞
本発明の航空タイヤ用ゴム組成物は、上記の各成分を、例えば、バンバリーミキサー、ロール、インターナルミキサー、ニーダー等により混練りすることにより製造される。
なお、混練り温度、混練り時間、混練り装置の種類等の諸条件については、目的に応じて適宜選択することができる。
また、混練りは一段で行ってもよく、多段で行ってもよく特に限定されない。多段で混練りを行う場合には、加硫剤及び加硫助剤を混練りの最終段階で加えることが好ましい。 <Method for producing rubber composition for aviation tire>
The rubber composition for aviation tires of the present invention is produced by kneading the above components with, for example, a Banbury mixer, a roll, an internal mixer, a kneader or the like.
Various conditions such as kneading temperature, kneading time, type of kneading apparatus and the like can be appropriately selected according to the purpose.
Moreover, kneading | mixing may be performed by 1 step | paragraph and may be performed by multi-stage and is not specifically limited. When kneading in multiple stages, it is preferable to add a vulcanizing agent and a vulcanization aid at the final stage of kneading.
本発明の航空タイヤ用ゴム組成物は、上記の各成分を、例えば、バンバリーミキサー、ロール、インターナルミキサー、ニーダー等により混練りすることにより製造される。
なお、混練り温度、混練り時間、混練り装置の種類等の諸条件については、目的に応じて適宜選択することができる。
また、混練りは一段で行ってもよく、多段で行ってもよく特に限定されない。多段で混練りを行う場合には、加硫剤及び加硫助剤を混練りの最終段階で加えることが好ましい。 <Method for producing rubber composition for aviation tire>
The rubber composition for aviation tires of the present invention is produced by kneading the above components with, for example, a Banbury mixer, a roll, an internal mixer, a kneader or the like.
Various conditions such as kneading temperature, kneading time, type of kneading apparatus and the like can be appropriately selected according to the purpose.
Moreover, kneading | mixing may be performed by 1 step | paragraph and may be performed by multi-stage and is not specifically limited. When kneading in multiple stages, it is preferable to add a vulcanizing agent and a vulcanization aid at the final stage of kneading.
〔航空タイヤ用架橋ゴム組成物〕
本発明の航空タイヤ用架橋ゴム組成物は、上述した本発明のゴム組成物を架橋してなることを特徴とする。
架橋の温度や時間等の各種の条件は適宜選択すればよく、特に限定されない。 [Crosslinked rubber composition for aviation tires]
The crosslinked rubber composition for aviation tires of the present invention is characterized in that the rubber composition of the present invention described above is crosslinked.
Various conditions such as crosslinking temperature and time may be selected as appropriate and are not particularly limited.
本発明の航空タイヤ用架橋ゴム組成物は、上述した本発明のゴム組成物を架橋してなることを特徴とする。
架橋の温度や時間等の各種の条件は適宜選択すればよく、特に限定されない。 [Crosslinked rubber composition for aviation tires]
The crosslinked rubber composition for aviation tires of the present invention is characterized in that the rubber composition of the present invention described above is crosslinked.
Various conditions such as crosslinking temperature and time may be selected as appropriate and are not particularly limited.
〔航空タイヤ〕
本発明の航空タイヤは、本発明の航空タイヤ用架橋ゴム組成物をタイヤ部材として用いてなる。
本発明の航空タイヤ用架橋ゴム組成物は、航空タイヤのタイヤトレッドとして好適であるが、これに限定されるものではなく、トレッド以外のタイヤ部材に使用してもよい。なお、航空タイヤ以外の用途、例えば、コンベアベルト等のベルト部材、耐摩耗性及び耐亀裂性に優れたホース製品等に使用することを排除するものではない。
航空タイヤは、本発明のゴム組成物を混練りして、該ゴム組成物を所定の断面形状に押し出す、又は繊維コード等を所定の厚みに被覆して、所望のタイヤ成型用ゴム部材に加工し、目的とする航空タイヤの所定箇所に貼り付けた後、所定のモールド内で所定の温度及び圧力の下で加硫成形することにより航空タイヤを製造することができる。 [Aviation tire]
The aviation tire of the present invention uses the crosslinked rubber composition for an aviation tire of the present invention as a tire member.
The crosslinked rubber composition for aviation tires of the present invention is suitable as a tire tread for aviation tires, but is not limited thereto, and may be used for tire members other than treads. In addition, it does not exclude using it for uses other than aviation tires, for example, belt members, such as a conveyor belt, hose products excellent in abrasion resistance and crack resistance.
Aviation tires are kneaded with the rubber composition of the present invention and extruded into a predetermined cross-sectional shape, or coated with a fiber cord or the like to a predetermined thickness, and processed into a desired rubber member for molding a tire. And after affixing on the predetermined location of the target aviation tire, an aviation tire can be manufactured by carrying out vulcanization molding under the predetermined temperature and pressure in a predetermined mold.
本発明の航空タイヤは、本発明の航空タイヤ用架橋ゴム組成物をタイヤ部材として用いてなる。
本発明の航空タイヤ用架橋ゴム組成物は、航空タイヤのタイヤトレッドとして好適であるが、これに限定されるものではなく、トレッド以外のタイヤ部材に使用してもよい。なお、航空タイヤ以外の用途、例えば、コンベアベルト等のベルト部材、耐摩耗性及び耐亀裂性に優れたホース製品等に使用することを排除するものではない。
航空タイヤは、本発明のゴム組成物を混練りして、該ゴム組成物を所定の断面形状に押し出す、又は繊維コード等を所定の厚みに被覆して、所望のタイヤ成型用ゴム部材に加工し、目的とする航空タイヤの所定箇所に貼り付けた後、所定のモールド内で所定の温度及び圧力の下で加硫成形することにより航空タイヤを製造することができる。 [Aviation tire]
The aviation tire of the present invention uses the crosslinked rubber composition for an aviation tire of the present invention as a tire member.
The crosslinked rubber composition for aviation tires of the present invention is suitable as a tire tread for aviation tires, but is not limited thereto, and may be used for tire members other than treads. In addition, it does not exclude using it for uses other than aviation tires, for example, belt members, such as a conveyor belt, hose products excellent in abrasion resistance and crack resistance.
Aviation tires are kneaded with the rubber composition of the present invention and extruded into a predetermined cross-sectional shape, or coated with a fiber cord or the like to a predetermined thickness, and processed into a desired rubber member for molding a tire. And after affixing on the predetermined location of the target aviation tire, an aviation tire can be manufactured by carrying out vulcanization molding under the predetermined temperature and pressure in a predetermined mold.
以下、実施例及び比較例により本発明を更に詳細に説明するが、本発明は以下の実施例等に限定されるものではない。
［実施例１～９、及び比較例１～６］
下記表１及び表２に示す配合処方に従って、各実施例及び比較例のゴム組成物をそれぞれ調製した。得られたゴム組成物を航空タイヤのトレッドゴムとして適用した。
より具体的には、得られたゴム組成物を用いて、タイヤサイズ５０×２０．０Ｒ２２＿３２ＰＲの航空機用ラジアルタイヤを作製した。
作製したタイヤについて、以下の評価を行った。 EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further in detail, this invention is not limited to a following example etc.
[Examples 1 to 9 and Comparative Examples 1 to 6]
According to the formulation shown in Table 1 and Table 2 below, rubber compositions of Examples and Comparative Examples were prepared. The obtained rubber composition was applied as a tread rubber of an aviation tire.
More specifically, a radial tire for an aircraft having a tire size of 50 × 20.0R22 — 32PR was produced using the obtained rubber composition.
The following evaluation was performed about the produced tire.
［実施例１～９、及び比較例１～６］
下記表１及び表２に示す配合処方に従って、各実施例及び比較例のゴム組成物をそれぞれ調製した。得られたゴム組成物を航空タイヤのトレッドゴムとして適用した。
より具体的には、得られたゴム組成物を用いて、タイヤサイズ５０×２０．０Ｒ２２＿３２ＰＲの航空機用ラジアルタイヤを作製した。
作製したタイヤについて、以下の評価を行った。 EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further in detail, this invention is not limited to a following example etc.
[Examples 1 to 9 and Comparative Examples 1 to 6]
According to the formulation shown in Table 1 and Table 2 below, rubber compositions of Examples and Comparative Examples were prepared. The obtained rubber composition was applied as a tread rubber of an aviation tire.
More specifically, a radial tire for an aircraft having a tire size of 50 × 20.0R22 — 32PR was produced using the obtained rubber composition.
The following evaluation was performed about the produced tire.
［評価］
＜ゴムの劣化手法＞
作製したタイヤにて、ＴＳＯドラム試験として行われるＴａｘｉ条件での走行を１００回行って劣化を進めた。より具体的には、各試験タイヤをリムに装着し、ドラム試験機上に取り付け、内圧１５３０ｋＰａ、荷重２０，８７０ｋｇの条件下で、Ｔａｘｉ試験（時速６４ｋｍにて１０分間走行後、タイヤ停止状態にて１１０分間冷却）を１００回繰り返した。 [Evaluation]
<Rubber degradation technique>
The produced tire was run 100 times under the Taxi condition, which was performed as a TSO drum test, to promote deterioration. More specifically, each test tire is mounted on a rim, mounted on a drum testing machine, and under the conditions of an internal pressure of 1530 kPa and a load of 20,870 kg, the Taxi test (running for 10 minutes at a speed of 64 km / h, then the tire stopped. Cooling for 110 minutes) was repeated 100 times.
＜ゴムの劣化手法＞
作製したタイヤにて、ＴＳＯドラム試験として行われるＴａｘｉ条件での走行を１００回行って劣化を進めた。より具体的には、各試験タイヤをリムに装着し、ドラム試験機上に取り付け、内圧１５３０ｋＰａ、荷重２０，８７０ｋｇの条件下で、Ｔａｘｉ試験（時速６４ｋｍにて１０分間走行後、タイヤ停止状態にて１１０分間冷却）を１００回繰り返した。 [Evaluation]
<Rubber degradation technique>
The produced tire was run 100 times under the Taxi condition, which was performed as a TSO drum test, to promote deterioration. More specifically, each test tire is mounted on a rim, mounted on a drum testing machine, and under the conditions of an internal pressure of 1530 kPa and a load of 20,870 kg, the Taxi test (running for 10 minutes at a speed of 64 km / h, then the tire stopped. Cooling for 110 minutes) was repeated 100 times.
＜耐摩耗性試験＞
上述のドラム試験により劣化させたタイヤのセンターリブから、厚さ５ｍｍの板形状のゴム板を切り出した。切り出したゴム板から試験サンプルを作製し、耐摩耗性を評価した。
耐摩耗性は、ＪＩＳ Ｋ ６２６４－１９９３に準拠したランボーン摩耗試験により、ゴムサンプルの摩耗量を２２０℃で試験した後、下記式により算出し、比較例４を１００として指数表示した。
耐摩耗性指数＝（比較例４の摩耗量／供試サンプルの摩耗量）×１００
耐摩耗性指数が大きいほど、耐摩耗性が優れることを表す。なお、「２２０℃で試験した」とは、試験片表面温度の最高温度が２２０±１０℃となる下記条件で試験したことをいう。試験条件は、以下の通りである。
試験片寸法：直径×厚さ＝４９．０ｍｍ×５．０ｍｍ
試験片回転速度：２００ｒｐｍ
試験路面回転速度：２０ｒｐｍ
試験荷重：７ｋｇｆ
試験時間：１６秒
雰囲気温度：２５℃ <Abrasion resistance test>
A plate-shaped rubber plate having a thickness of 5 mm was cut out from the center rib of the tire deteriorated by the drum test described above. A test sample was prepared from the cut rubber plate and evaluated for wear resistance.
The abrasion resistance was calculated by the following formula after the abrasion amount of a rubber sample was tested at 220 ° C. by a Lambourne abrasion test in accordance with JIS K 6264-1993.
Abrasion resistance index = (Abrasion amount of Comparative Example 4 / Abrasion amount of test sample) × 100
The larger the wear resistance index, the better the wear resistance. “Tested at 220 ° C.” means that the test was performed under the following conditions where the maximum surface temperature of the test piece was 220 ± 10 ° C. The test conditions are as follows.
Specimen size: Diameter x thickness = 49.0 mm x 5.0 mm
Test piece rotation speed: 200 rpm
Test road rotation speed: 20rpm
Test load: 7kgf
Test time: 16 seconds Ambient temperature: 25 ° C
上述のドラム試験により劣化させたタイヤのセンターリブから、厚さ５ｍｍの板形状のゴム板を切り出した。切り出したゴム板から試験サンプルを作製し、耐摩耗性を評価した。
耐摩耗性は、ＪＩＳ Ｋ ６２６４－１９９３に準拠したランボーン摩耗試験により、ゴムサンプルの摩耗量を２２０℃で試験した後、下記式により算出し、比較例４を１００として指数表示した。
耐摩耗性指数＝（比較例４の摩耗量／供試サンプルの摩耗量）×１００
耐摩耗性指数が大きいほど、耐摩耗性が優れることを表す。なお、「２２０℃で試験した」とは、試験片表面温度の最高温度が２２０±１０℃となる下記条件で試験したことをいう。試験条件は、以下の通りである。
試験片寸法：直径×厚さ＝４９．０ｍｍ×５．０ｍｍ
試験片回転速度：２００ｒｐｍ
試験路面回転速度：２０ｒｐｍ
試験荷重：７ｋｇｆ
試験時間：１６秒
雰囲気温度：２５℃ <Abrasion resistance test>
A plate-shaped rubber plate having a thickness of 5 mm was cut out from the center rib of the tire deteriorated by the drum test described above. A test sample was prepared from the cut rubber plate and evaluated for wear resistance.
The abrasion resistance was calculated by the following formula after the abrasion amount of a rubber sample was tested at 220 ° C. by a Lambourne abrasion test in accordance with JIS K 6264-1993.
Abrasion resistance index = (Abrasion amount of Comparative Example 4 / Abrasion amount of test sample) × 100
The larger the wear resistance index, the better the wear resistance. “Tested at 220 ° C.” means that the test was performed under the following conditions where the maximum surface temperature of the test piece was 220 ± 10 ° C. The test conditions are as follows.
Specimen size: Diameter x thickness = 49.0 mm x 5.0 mm
Test piece rotation speed: 200 rpm
Test road rotation speed: 20rpm
Test load: 7kgf
Test time: 16 seconds Ambient temperature: 25 ° C
＜耐亀裂性試験＞
上述のドラム試験により劣化させたタイヤのセンターリブから、厚さ２ｍｍの板状のシートを切り出した。切り出したゴムシートから試験サンプルを作製し、耐亀裂性を評価した。
試験サンプルはＪＩＳ５号ダンベル状に切り出し、ダンベルサンプルの中央に０．５ｍｍの傷を入れたものである。ダンベルサンプルの両端を掴み、下記条件下で繰り返し入力を行い、試験サンプルが破断するまでの回数を測定した。耐亀裂性は下記式より算出し、比較例４を１００として指数表示した。
耐亀裂性指数＝（供試サンプルの破断回数／比較例４の破断回数）×１００
耐亀裂性指数が大きい程、耐亀裂性が優れることを表す。
標点間距離：３０．０ｍｍ
試験応力：１．５Ｎ（最大）、０Ｎ（最小）
周波数：５Ｈｚ
雰囲気温度：８０℃
結果を以下の表１及び表２に示す。 <Crack resistance test>
A plate-like sheet having a thickness of 2 mm was cut out from the center rib of the tire deteriorated by the drum test described above. A test sample was prepared from the cut rubber sheet and evaluated for crack resistance.
The test sample was cut into a JIS No. 5 dumbbell shape, and a 0.5 mm wound was made in the center of the dumbbell sample. The both ends of the dumbbell sample were gripped, input was repeated under the following conditions, and the number of times until the test sample broke was measured. The crack resistance was calculated from the following formula, and indexed with Comparative Example 4 as 100.
Crack resistance index = (number of fractures of test sample / number of fractures of Comparative Example 4) × 100
The larger the crack resistance index, the better the crack resistance.
Distance between gauge points: 30.0mm
Test stress: 1.5N (maximum), 0N (minimum)
Frequency: 5Hz
Atmospheric temperature: 80 ° C
The results are shown in Tables 1 and 2 below.
上述のドラム試験により劣化させたタイヤのセンターリブから、厚さ２ｍｍの板状のシートを切り出した。切り出したゴムシートから試験サンプルを作製し、耐亀裂性を評価した。
試験サンプルはＪＩＳ５号ダンベル状に切り出し、ダンベルサンプルの中央に０．５ｍｍの傷を入れたものである。ダンベルサンプルの両端を掴み、下記条件下で繰り返し入力を行い、試験サンプルが破断するまでの回数を測定した。耐亀裂性は下記式より算出し、比較例４を１００として指数表示した。
耐亀裂性指数＝（供試サンプルの破断回数／比較例４の破断回数）×１００
耐亀裂性指数が大きい程、耐亀裂性が優れることを表す。
標点間距離：３０．０ｍｍ
試験応力：１．５Ｎ（最大）、０Ｎ（最小）
周波数：５Ｈｚ
雰囲気温度：８０℃
結果を以下の表１及び表２に示す。 <Crack resistance test>
A plate-like sheet having a thickness of 2 mm was cut out from the center rib of the tire deteriorated by the drum test described above. A test sample was prepared from the cut rubber sheet and evaluated for crack resistance.
The test sample was cut into a JIS No. 5 dumbbell shape, and a 0.5 mm wound was made in the center of the dumbbell sample. The both ends of the dumbbell sample were gripped, input was repeated under the following conditions, and the number of times until the test sample broke was measured. The crack resistance was calculated from the following formula, and indexed with Comparative Example 4 as 100.
Crack resistance index = (number of fractures of test sample / number of fractures of Comparative Example 4) × 100
The larger the crack resistance index, the better the crack resistance.
Distance between gauge points: 30.0mm
Test stress: 1.5N (maximum), 0N (minimum)
Frequency: 5Hz
Atmospheric temperature: 80 ° C
The results are shown in Tables 1 and 2 below.
表１及び表２中の各成分は以下の通りである。
＊１ 天然ゴム：ＲＳＳ＃３
＊２ ブタジエンゴム：ＵＢＥ ＰＯＬ－１５０Ｌ（宇部興産株式会社製）
＊３ カーボンブラック：ＶＵＬＣＡＮ ６ ＳＨＯＢＬＡＣＫ（Ｃａｂｏｔ社製）
＊４ 老化防止剤：ノクラック６Ｃ（大内新興化学工業株式会社製）
＊５ ワックス：サンタイトＡ（精工化学株式会社製）
＊６ 活性酸化亜鉛：活性亜鉛華ＡＺＯ（正同化学工業株式会社製、ＢＥＴ比表面積：５０ｍ２／ｇ以上）
＊７ 脂肪酸金属塩：Ａｋｔｉｐｌａｓｔ ＰＰ（主成分は、オレイン酸亜鉛及びパルミチン酸亜鉛）（ラインケミー社製）
＊８ 老化防止剤（ＴＭＤＱ）：ノンフレックスＲＤ（精工化学株式会社製）
＊９ 加硫促進剤（ＣＢＳ）：サンセラーＣＭ－Ｇ（三新化学工業株式会社製） Each component in Table 1 and Table 2 is as follows.
* 1 Natural rubber: RSS # 3
* 2 Butadiene rubber: UBE POL-150L (manufactured by Ube Industries)
* 3 Carbon black: VULCAN 6 SHOBLACK (manufactured by Cabot)
* 4 Anti-aging agent: NOCRACK 6C (Ouchi Shinsei Chemical Co., Ltd.)
* 5 Wax: Suntite A (Seiko Chemical Co., Ltd.)
* 6 Active zinc oxide: Active zinc white AZO (manufactured by Shodo Chemical Co., Ltd., BET specific surface area: 50 m 2 / g or more)
* 7 Fatty acid metal salt: Aktiplast PP (main components are zinc oleate and zinc palmitate) (Rhein Chemie)
* 8 Anti-aging agent (TMDQ): Non-flex RD (manufactured by Seiko Chemical Co., Ltd.)
* 9 Vulcanization accelerator (CBS): Sunseller CM-G (manufactured by Sanshin Chemical Industry Co., Ltd.)
＊１ 天然ゴム：ＲＳＳ＃３
＊２ ブタジエンゴム：ＵＢＥ ＰＯＬ－１５０Ｌ（宇部興産株式会社製）
＊３ カーボンブラック：ＶＵＬＣＡＮ ６ ＳＨＯＢＬＡＣＫ（Ｃａｂｏｔ社製）
＊４ 老化防止剤：ノクラック６Ｃ（大内新興化学工業株式会社製）
＊５ ワックス：サンタイトＡ（精工化学株式会社製）
＊６ 活性酸化亜鉛：活性亜鉛華ＡＺＯ（正同化学工業株式会社製、ＢＥＴ比表面積：５０ｍ２／ｇ以上）
＊７ 脂肪酸金属塩：Ａｋｔｉｐｌａｓｔ ＰＰ（主成分は、オレイン酸亜鉛及びパルミチン酸亜鉛）（ラインケミー社製）
＊８ 老化防止剤（ＴＭＤＱ）：ノンフレックスＲＤ（精工化学株式会社製）
＊９ 加硫促進剤（ＣＢＳ）：サンセラーＣＭ－Ｇ（三新化学工業株式会社製） Each component in Table 1 and Table 2 is as follows.
* 1 Natural rubber: RSS # 3
* 2 Butadiene rubber: UBE POL-150L (manufactured by Ube Industries)
* 3 Carbon black: VULCAN 6 SHOBLACK (manufactured by Cabot)
* 4 Anti-aging agent: NOCRACK 6C (Ouchi Shinsei Chemical Co., Ltd.)
* 5 Wax: Suntite A (Seiko Chemical Co., Ltd.)
* 6 Active zinc oxide: Active zinc white AZO (manufactured by Shodo Chemical Co., Ltd., BET specific surface area: 50 m 2 / g or more)
* 7 Fatty acid metal salt: Aktiplast PP (main components are zinc oleate and zinc palmitate) (Rhein Chemie)
* 8 Anti-aging agent (TMDQ): Non-flex RD (manufactured by Seiko Chemical Co., Ltd.)
* 9 Vulcanization accelerator (CBS): Sunseller CM-G (manufactured by Sanshin Chemical Industry Co., Ltd.)
表１及び表２の結果から、実施例１～９のゴム組成物から得られた架橋ゴム組成物では、得られた航空タイヤの耐摩耗性及び耐亀裂性の劣化が抑制された。一方、比較例のゴム組成物では、タイヤ劣化後において、耐摩耗性及び耐亀裂性が劣っていた。
From the results of Tables 1 and 2, in the crosslinked rubber compositions obtained from the rubber compositions of Examples 1 to 9, deterioration of the wear resistance and crack resistance of the obtained aviation tires was suppressed. On the other hand, the rubber composition of the comparative example was inferior in wear resistance and crack resistance after tire deterioration.
Claims (12)
- ジエンゴムを含むゴム成分を含有し、
ゴム成分１００質量部に対する脂肪酸の含有量が０．５質量部未満であることを特徴とする、
航空タイヤ用ゴム組成物。 Contains rubber components including diene rubber,
The content of fatty acid with respect to 100 parts by mass of the rubber component is less than 0.5 parts by mass,
Rubber composition for aviation tires. - ゴム成分１００質量部に対する酸化亜鉛及び脂肪酸の合計含有量が４質量部以下である、請求項１に記載の航空タイヤ用ゴム組成物。 The rubber composition for aviation tires according to claim 1, wherein the total content of zinc oxide and fatty acid with respect to 100 parts by mass of the rubber component is 4 parts by mass or less.
- ゴム組成物が酸化亜鉛を含有し、脂肪酸の含有量に対する酸化亜鉛の含有量の質量比（酸化亜鉛／脂肪酸）が３以上である、請求項１又は２に記載の航空タイヤ用ゴム組成物。 The rubber composition for aviation tires according to claim 1 or 2, wherein the rubber composition contains zinc oxide, and a mass ratio of zinc oxide content to zinc content (zinc oxide / fatty acid) is 3 or more.
- ゴム組成物が酸化亜鉛を含有し、ゴム成分１００質量部に対する酸化亜鉛の含有量が３質量部以下である、請求項１～３のいずれか１項に記載の航空タイヤ用ゴム組成物。 The rubber composition for an aviation tire according to any one of claims 1 to 3, wherein the rubber composition contains zinc oxide, and the content of zinc oxide with respect to 100 parts by mass of the rubber component is 3 parts by mass or less.
- ゴム組成物が活性酸化亜鉛を含有し、ゴム成分１００質量部に対する活性酸化亜鉛の含有量が３質量部以下である、請求項１～３のいずれか１項に記載の航空タイヤ用ゴム組成物。 The rubber composition for an aviation tire according to any one of claims 1 to 3, wherein the rubber composition contains active zinc oxide, and the content of the active zinc oxide with respect to 100 parts by mass of the rubber component is 3 parts by mass or less. .
- 脂肪酸を実質的に含有しない、請求項１～５のいずれか１項に記載の航空タイヤ用ゴム組成物。 The rubber composition for an aviation tire according to any one of claims 1 to 5, which contains substantially no fatty acid.
- 更に脂肪酸金属塩を含有する、請求項１～６のいずれか１項に記載の航空タイヤ用ゴム組成物。 The rubber composition for an aviation tire according to any one of claims 1 to 6, further comprising a fatty acid metal salt.
- ゴム成分１００質量部に対する脂肪酸金属塩の含有量が２．５質量部以下である、請求項７に記載の航空タイヤ用ゴム組成物。 The rubber composition for an aviation tire according to claim 7, wherein the content of the fatty acid metal salt with respect to 100 parts by mass of the rubber component is 2.5 parts by mass or less.
- ジエンゴムが、天然ゴム、ポリイソプレン、及びブタジエンゴムよりなる群から選択される少なくとも１種を含む、請求項１～８のいずれか１項に記載の航空タイヤ用ゴム組成物。 The aviation tire rubber composition according to any one of claims 1 to 8, wherein the diene rubber comprises at least one selected from the group consisting of natural rubber, polyisoprene, and butadiene rubber.
- 請求項１～９のいずれか１項に記載のゴム組成物を架橋してなる、航空タイヤ用架橋ゴム組成物。 A crosslinked rubber composition for aviation tires, which is obtained by crosslinking the rubber composition according to any one of claims 1 to 9.
- 請求項１０に記載の航空タイヤ用架橋ゴム組成物をタイヤ部材として用いてなる、航空タイヤ。 An aviation tire comprising the crosslinked rubber composition for an aviation tire according to claim 10 as a tire member.
- 前記タイヤ部材がタイヤトレッドである、請求項１１に記載の航空タイヤ。
The aviation tire according to claim 11, wherein the tire member is a tire tread.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016149734 | 2016-07-29 | ||
| JP2016-149734 | 2016-07-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2018021563A1 true WO2018021563A1 (en) | 2018-02-01 |
Family
ID=61016943
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2017/027552 WO2018021563A1 (en) | 2016-07-29 | 2017-07-28 | Rubber composition for aviation tires, crosslinked rubber composition for aviation tires and aviation tire |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2018021563A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111944214A (en) * | 2020-08-24 | 2020-11-17 | 中国化工集团曙光橡胶工业研究设计院有限公司 | Aircraft tire tread rubber and preparation method and application thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010270266A (en) * | 2009-05-25 | 2010-12-02 | Bridgestone Corp | Rubber composition and pneumatic tire using the same |
| JP2011144267A (en) * | 2010-01-14 | 2011-07-28 | Sumitomo Rubber Ind Ltd | Studless tire for truck/bus or light truck |
-
2017
- 2017-07-28 WO PCT/JP2017/027552 patent/WO2018021563A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010270266A (en) * | 2009-05-25 | 2010-12-02 | Bridgestone Corp | Rubber composition and pneumatic tire using the same |
| JP2011144267A (en) * | 2010-01-14 | 2011-07-28 | Sumitomo Rubber Ind Ltd | Studless tire for truck/bus or light truck |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111944214A (en) * | 2020-08-24 | 2020-11-17 | 中国化工集团曙光橡胶工业研究设计院有限公司 | Aircraft tire tread rubber and preparation method and application thereof |
| CN111944214B (en) * | 2020-08-24 | 2022-05-03 | 中国化工集团曙光橡胶工业研究设计院有限公司 | Aircraft tire tread rubber and preparation method and application thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7368506B2 (en) | Rubber composition and pneumatic tire using same | |
| DE102015207453B4 (en) | Runflat tires | |
| US9109102B2 (en) | Rubber composition for use in tire side walls and pneumatic tire using the same | |
| WO2014203667A1 (en) | Rubber composition for tires, and pneumatic tire | |
| JP2009108117A (en) | Rubber composition, cushion rubber for recap using the same and recap | |
| WO2014020909A1 (en) | Rubber composition for tire rim cushion or rubber finishing, and pneumatic tire using same | |
| JP2011246563A (en) | Rubber composition for tire and pneumatic tire using the same | |
| JP6552454B2 (en) | Rubber composition for tire and pneumatic tire | |
| JP6374315B2 (en) | Rubber composition for tire and pneumatic tire | |
| WO2018021563A1 (en) | Rubber composition for aviation tires, crosslinked rubber composition for aviation tires and aviation tire | |
| JP3996115B2 (en) | Tire and manufacturing method thereof | |
| JP2004099804A (en) | Rubber composition for tire and pneumatic tire using the same | |
| JP2003113270A (en) | Rubber composition for side wall and pneumatic tire using the same | |
| DE102015210568B4 (en) | Runflat tires | |
| EP3252098B1 (en) | Rubber composition for vibration damping rubbers, and vibration damping rubber | |
| JP2010144069A (en) | Rubber composition for tire and pneumatic tire using the same | |
| US11236223B2 (en) | Rubber composition for inner liner and pneumatic tire | |
| DE102015214540B4 (en) | Runflat tires | |
| JP6716421B2 (en) | Pneumatic tire | |
| JP7225843B2 (en) | Rubber composition and pneumatic tire using the same | |
| JP7225827B2 (en) | Rubber composition and pneumatic tire using the same | |
| US20200407535A1 (en) | Rubber Composition and Pneumatic Tire | |
| US11807042B2 (en) | Pneumatic tire for heavy load | |
| JP7273623B2 (en) | Rubber composition and tire | |
| JP7251160B2 (en) | Rubber composition and pneumatic tire using the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 17834565 Country of ref document: EP Kind code of ref document: A1 |
|
| NENP | Non-entry into the national phase |
Ref country code: DE |
|
| 122 | Ep: pct application non-entry in european phase |
Ref document number: 17834565 Country of ref document: EP Kind code of ref document: A1 |
|
| NENP | Non-entry into the national phase |
Ref country code: JP |