JP6809985B2 - Friction transmission belt - Google Patents
Friction transmission belt Download PDFInfo
- Publication number
- JP6809985B2 JP6809985B2 JP2017111823A JP2017111823A JP6809985B2 JP 6809985 B2 JP6809985 B2 JP 6809985B2 JP 2017111823 A JP2017111823 A JP 2017111823A JP 2017111823 A JP2017111823 A JP 2017111823A JP 6809985 B2 JP6809985 B2 JP 6809985B2
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- Prior art keywords
- mass
- rubber
- parts
- belt
- friction
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Description
本発明は、VベルトやVリブドベルトなどの摩擦伝動面がV字状に傾斜し、プーリとベルト側面との間に生じる摩擦力を介して動力の伝達を行う摩擦伝動ベルトに関する。 The present invention relates to a friction transmission belt such as a V-belt or a V-ribbed belt in which a friction transmission surface is inclined in a V shape and power is transmitted via a frictional force generated between a pulley and a side surface of the belt.
摩擦伝動ベルトは、プーリとベルト側面との間に生じる摩擦力を介して動力の伝達を行っている。プーリとベルト側面との間の摩擦係数は大きい方が摩擦力も大きくなるため、動力伝達性という点では有利である。しかし、摩擦係数があまり高くなり過ぎると、ベルトがプーリから抜け出す際に必要な力が大きくなるため、ベルトがプーリから抜け難くなる。その結果、ベルトがプーリ出口付近で逆曲げされる形となるため、発熱や騒音の原因となっていた。特に、自動二輪車の変速用途に用いられるベルトにおいては、ベルトがプーリ間でプーリ径方向へ移動することにより変速を行っており、ベルト側面の摩擦係数が高くなると、プーリ径方向への移動の際に伝達ロスが多く発生し、省燃費性をも低下させる。これらの問題に対して、摩擦係数を低下させるための手段が従来から種々提案されているが、摩擦係数の低減に加えてベルトの耐側圧性をも向上させることができるために、圧縮ゴム層に短繊維を配合する方法が汎用されてきた。 The friction transmission belt transmits power through the frictional force generated between the pulley and the side surface of the belt. The larger the coefficient of friction between the pulley and the side surface of the belt, the larger the frictional force, which is advantageous in terms of power transmission. However, if the coefficient of friction becomes too high, the force required for the belt to come out of the pulley becomes large, and it becomes difficult for the belt to come out of the pulley. As a result, the belt is bent in the reverse direction near the outlet of the pulley, which causes heat generation and noise. In particular, in belts used for shifting in motorcycles, shifting is performed by moving the belt between pulleys in the pulley radial direction, and when the friction coefficient on the side surface of the belt becomes high, the belt moves in the pulley radial direction. A lot of transmission loss occurs in the belt, which also reduces fuel efficiency. Various means for reducing the coefficient of friction have been conventionally proposed for these problems, but since the lateral pressure resistance of the belt can be improved in addition to reducing the coefficient of friction, the compressed rubber layer The method of blending short fibers has been widely used.
しかし、短繊維は摩擦係数を低下させると共に、ベルトの耐側圧性を向上させる一方で、ゴムに発生するクラックの起点となりベルトの耐久性を低下させるため、多量に配合できない。 However, while the short fibers lower the coefficient of friction and improve the lateral pressure resistance of the belt, they become the starting points of cracks generated in the rubber and lower the durability of the belt, so that they cannot be blended in a large amount.
実公平7−31006号公報(特許文献1)には、V形圧縮部を有するゴム製動力伝動用ベルトであって、前記V形圧縮部側壁面に短繊維が突出して埋設され、さらにタルク、炭酸カルシウム、クレー、シリカから選択されたパウダー状の粘性抑制剤が、前記短繊維の突出部を埋め込む形で付着された動力伝達ベルトが開示されている。 According to Japanese Patent Application Laid-Open No. 7-31006 (Patent Document 1), a rubber power transmission belt having a V-shaped compression portion, in which short fibers are projected and embedded in the side wall surface of the V-type compression portion, and further, talc, A power transmission belt is disclosed in which a powdery viscosity inhibitor selected from calcium carbonate, clay, and silica is attached in a form of embedding the protrusions of the short fibers.
しかし、ベルト側面にパウダーを塗布した場合には、走行初期は摩擦係数を低減させることができるものの、時間の経過とともにパウダーが飛散してしまい、その効果が早期に失われてしまう。また、パウダーが過剰に塗布された場合には、必要以上に摩擦力が低下してしまい、動力伝達機能が損なわれる虞がある。 However, when powder is applied to the side surface of the belt, the coefficient of friction can be reduced at the initial stage of running, but the powder scatters with the passage of time, and the effect is lost at an early stage. Further, when the powder is excessively applied, the frictional force is lowered more than necessary, and the power transmission function may be impaired.
特開2007−232205号公報(特許文献2)には、摩擦伝動面が、エチレン・α−オレフィンエラストマー100重量部に対して、石油系可塑剤などの可塑剤10〜25重量部及びカーボンブラックなどの無機充填剤60〜110重量部を配合したゴム組成物で構成された摩擦伝動ベルトが開示されている。この文献には、ゴム組成物に可塑剤を添加することで、ブリードした可塑剤により適度な摩擦係数を維持できることが記載されている。 According to JP-A-2007-232205 (Patent Document 2), the friction transmission surface is 10 to 25 parts by weight of a plasticizer such as a petroleum-based plasticizer and carbon black, etc., with respect to 100 parts by weight of an ethylene / α-olefin elastomer. A friction transmission belt made of a rubber composition containing 60 to 110 parts by weight of the inorganic filler of the above is disclosed. This document describes that by adding a plasticizer to the rubber composition, the bleeding plasticizer can maintain an appropriate coefficient of friction.
しかし、ゴム組成物に可塑剤を添加した場合には、比較的長期に渡って摩擦係数を低減する効果が発揮されるものの、それでも可塑剤がブリードするのはベルト表面近傍からが中心であるため、一定期間後には可塑剤のブリードが低減してしまう。また、可塑剤のブリード量は温度条件に大きな影響を受け、条件によっては、期待した程の量がブリードせずに摩擦係数があまり低減しなかったり、逆に過剰にブリードして必要以上に摩擦係数が低下する。加えて、摩擦係数を低減するためには比較的多量の可塑剤を添加する必要があるが、多量の可塑剤を添加した場合にはゴムの物性が低下し、ベルトの耐側圧性や耐久性の低下を招く。 However, when a plasticizer is added to the rubber composition, the effect of reducing the coefficient of friction is exhibited for a relatively long period of time, but the plasticizer still bleeds mainly from the vicinity of the belt surface. After a certain period of time, the bleeding of the plasticizer will decrease. In addition, the amount of bleeding of the plasticizer is greatly affected by the temperature conditions, and depending on the conditions, the expected amount does not bleed and the friction coefficient does not decrease so much, or conversely, excessive bleeding causes excessive friction. The coefficient decreases. In addition, it is necessary to add a relatively large amount of plasticizer in order to reduce the coefficient of friction, but when a large amount of plasticizer is added, the physical characteristics of the rubber deteriorate, and the lateral pressure resistance and durability of the belt Causes a decrease in.
特開2005−15769号公報(特許文献3)には、エチレン・α−オレフィンエラストマーなどの原料ゴム100重量部に対して、ポリアミド短繊維10〜50質量部、固体潤滑剤10〜100質量部を配合した圧縮ゴム層を備えた伝動ベルトが開示されている。この文献には、前記固体潤滑剤として、グラファイト、二硫化モリブデン、ポリテトラフルオロエチレン(PTFE)などを用いて、ゴム組成物の摩擦係数を低下させることが記載されている。 Japanese Patent Application Laid-Open No. 2005-15769 (Patent Document 3) describes 10 to 50 parts by mass of short polyamide fibers and 10 to 100 parts by mass of a solid lubricant with respect to 100 parts by mass of raw rubber such as ethylene / α-olefin elastomer. A transmission belt with a compounded compression rubber layer is disclosed. This document describes that graphite, molybdenum disulfide, polytetrafluoroethylene (PTFE), or the like is used as the solid lubricant to reduce the coefficient of friction of the rubber composition.
しかし、ゴム組成物に固体潤滑剤を添加した場合には、長期に亘って摩擦係数を低減する効果が発揮されるものの、十分な摩擦係数の低減効果を発現させるためには多量の固体潤滑剤を添加する必要がある。固体潤滑剤の添加量が多くなり過ぎると、ゴムの加工性が低下したり、ゴムの伸びが小さくなって耐屈曲疲労性が低下したり、ゴムに発生するクラックの起点となり耐久性を低下させる。 However, when a solid lubricant is added to the rubber composition, although the effect of reducing the friction coefficient is exhibited for a long period of time, a large amount of solid lubricant is exhibited in order to exhibit a sufficient effect of reducing the friction coefficient. Need to be added. If the amount of the solid lubricant added is too large, the workability of the rubber will be reduced, the elongation of the rubber will be reduced and the bending fatigue resistance will be reduced, and the rubber will become the starting point of cracks and the durability will be reduced. ..
本発明の目的は、耐摩耗性、耐側圧性(剛性)及び耐久性を損ねることなく、摺動性を向上できる摩擦伝動ベルトを提供することにある。 An object of the present invention is to provide a friction transmission belt capable of improving slidability without impairing wear resistance, lateral pressure resistance (rigidity) and durability.
本発明の他の目的は、変速ベルトなどの高負荷環境での過酷な状況でも、耐久性を損ねることなく、耐発音性及び省燃費性を向上できる摩擦伝動ベルトを提供することにある。 Another object of the present invention is to provide a friction transmission belt capable of improving sound resistance and fuel efficiency without impairing durability even in a harsh situation in a high load environment such as a speed change belt.
本発明者は、前記課題を達成するため鋭意検討した結果、摩擦伝動ベルトにおける圧縮ゴム層の摩擦伝動面をゴム成分及びグラフェン類を含むゴム組成物の加硫物で形成することにより、耐摩耗性、耐側圧性及び耐久性を損ねることなく、摺動性を向上できることを見出し、本発明を完成した。 As a result of diligent studies to achieve the above problems, the present inventor has formed the friction transmission surface of the compression rubber layer in the friction transmission belt with a vulcanized product of a rubber composition containing a rubber component and graphenes, thereby causing abrasion resistance. The present invention has been completed by finding that slidability can be improved without impairing properties, lateral pressure resistance and durability.
すなわち、本発明の摩擦伝動ベルトは、少なくとも一部がプーリと接触可能な摩擦伝動面を有する圧縮ゴム層を備えた摩擦伝動ベルトであって、前記圧縮ゴム層の摩擦伝動面が、ゴム成分及びグラフェン類を含むゴム組成物の加硫物で形成されている。前記グラフェン類の割合はゴム成分100質量部に対して0.1〜10質量部程度である。前記グラフェン類の平均粒子径は0.1〜3μm程度である。前記圧縮ゴム層は短繊維をさらに含んでいてもよい。前記短繊維はベルト幅方向に配向していてもよい。前記短繊維の割合はゴム成分100質量部に対して30質量部以下であってもよい。前記グラフェン類の割合はゴム成分100質量部に対して0.5〜5質量部であり、かつ前記圧縮ゴム層は固体潤滑剤及び/又は摩擦調整剤をさらに含んでいてもよい。前記グラフェン類の割合は、固体潤滑剤及び摩擦調整剤の合計100質量部に対して1〜50質量部程度である。前記ゴム成分はクロロプレンゴムであってもよい。本発明の摩擦伝動ベルトは、ローエッジコグドVベルトであってもよい。 That is, the friction transmission belt of the present invention is a friction transmission belt provided with a compression rubber layer having a friction transmission surface at least partially in contact with the pulley, and the friction transmission surface of the compression rubber layer is a rubber component and It is made of a vulcanized rubber composition containing graphenes. The ratio of the graphenes is about 0.1 to 10 parts by mass with respect to 100 parts by mass of the rubber component. The average particle size of the graphenes is about 0.1 to 3 μm. The compressed rubber layer may further contain short fibers. The short fibers may be oriented in the belt width direction. The ratio of the short fibers may be 30 parts by mass or less with respect to 100 parts by mass of the rubber component. The ratio of the graphenes is 0.5 to 5 parts by mass with respect to 100 parts by mass of the rubber component, and the compressed rubber layer may further contain a solid lubricant and / or a friction modifier. The ratio of the graphenes is about 1 to 50 parts by mass with respect to 100 parts by mass in total of the solid lubricant and the friction modifier. The rubber component may be chloroprene rubber. The friction transmission belt of the present invention may be a low-edge cogged V-belt.
本発明では、摩擦伝動ベルトにおける圧縮ゴム層の摩擦伝動面がゴム成分及びグラフェン類を含むゴム組成物の加硫物で形成されているため、耐摩耗性、耐側圧性及び耐久性を損ねることなく、摺動性を向上できる。特に、摩擦伝動面の摩擦係数を低減させることにより発熱や騒音を低減でき、伝達ロスを低下できる。そのため、変速ベルトなどの高負荷環境での過酷な状況でも、耐久性を損ねることなく、耐発音性及び省燃費性を向上できる。 In the present invention, since the friction transmission surface of the compression rubber layer in the friction transmission belt is formed of a vulcanized product of a rubber composition containing a rubber component and graphenes, the abrasion resistance, lateral pressure resistance and durability are impaired. It is possible to improve the slidability. In particular, by reducing the friction coefficient of the friction transmission surface, heat generation and noise can be reduced, and transmission loss can be reduced. Therefore, even in a harsh situation in a high load environment such as a speed change belt, sound resistance and fuel saving can be improved without impairing durability.
[摩擦伝動ベルトの構造]
本発明の摩擦伝動ベルトとしては、圧縮ゴム層の摩擦伝動面がゴム成分及びグラフェン類を含んでいればよく、慣用の摩擦伝動ベルトを利用できる。本発明の摩擦伝動ベルトとしては、例えば、Vベルト[ラップドVベルト、ローエッジVベルト、ローエッジコグドVベルト(ローエッジベルトの内周側にコグが形成されたローエッジコグドVベルト、ローエッジベルトの内周側及び外周側の双方にコグが形成されたローエッジダブルコグドVベルト)]、Vリブドベルト、平ベルトなどが例示できる。これらの摩擦伝動ベルトのうち、プーリからの側圧を大きく受ける点から、摩擦伝動面がV字状に傾斜して(V角度で)形成されているVベルト又はVリブドベルトが好ましく、耐側圧性及び耐久性と省燃費性との高度な両立を要求されるベルト式無段変速装置に用いられる点から、ローエッジコグドVベルトが特に好ましい。
[Structure of friction transmission belt]
As the friction transmission belt of the present invention, it is sufficient that the friction transmission surface of the compressed rubber layer contains a rubber component and graphenes, and a conventional friction transmission belt can be used. Examples of the friction transmission belt of the present invention include V-belts [wrapped V-belts, low-edge V-belts, low-edge cogged V-belts (low-edge cogged V-belts having cogs formed on the inner peripheral side of the low-edge belts, low-edge belts). Low-edge double-cogged V-belts with cogs formed on both the peripheral side and the outer peripheral side)], V-ribbed belts, flat belts, and the like can be exemplified. Among these friction transmission belts, a V-belt or a V-ribbed belt in which the friction transmission surface is formed to be inclined in a V shape (at a V angle) is preferable from the viewpoint of receiving a large amount of lateral pressure from the pulley, and lateral pressure resistance and lateral pressure resistance and A low-edge cogged V-belt is particularly preferable because it is used in a belt-type continuously variable transmission that requires a high degree of both durability and fuel efficiency.
図1は、本発明の摩擦伝動ベルト(ローエッジコグドVベルト)の一例を示す概略斜視図であり、図2は、図1の摩擦伝動ベルトをベルト長手方向に切断した概略断面図である。 FIG. 1 is a schematic perspective view showing an example of a friction transmission belt (low-edge cogged V-belt) of the present invention, and FIG. 2 is a schematic cross-sectional view of the friction transmission belt of FIG. 1 cut in the longitudinal direction of the belt.
この例では、摩擦伝動ベルト1は、ベルト本体の内周面に、ベルトの長手方向に沿って所定の間隔をおいて形成された複数のコグ部1aを有しており、このコグ部1aの長手方向(図中のA方向)における断面形状は略半円状(湾曲状又は波形状)であり、長手方向に対して直交する方向(幅方向又は図中のB方向)における断面形状は台形状である。すなわち、各コグ部1aは、ベルト厚み方向において、コグ底部1bからA方向の断面において略半円状に突出している。摩擦伝動ベルト1は、積層構造を有しており、ベルト外周側から内周側(コグ部1aが形成された側)に向かって、補強布2、伸張ゴム層3、接着ゴム層4、圧縮ゴム層5、補強布6が順次積層されている。ベルト幅方向における断面形状は、ベルト外周側から内周側に向かってベルト幅が小さくなる台形状である。さらに、接着ゴム層4内には、芯体4aが埋設されており、前記コグ部1aは、コグ付き成形型により圧縮ゴム層5に形成されている。
In this example, the
[圧縮ゴム層]
本発明では、圧縮ゴム層の摩擦伝動面がゴム成分及びグラフェン類を含むゴム組成物の加硫物で形成されているため、圧縮ゴム層の摩擦伝動面の少なくとも一部にグラフェン類が存在し、摩擦伝動面の摩擦係数を低減(摺動性が向上)できる。圧縮ゴム層は、摩擦伝動面が前記ゴム組成物で形成されていればよく、例えば、摩擦伝動面において、グラフェン類を含むゴム組成物で形成された表層部を形成し、他の部分(内層部)はグラフェン類を含まない圧縮ゴム層であってもよいが、生産性などの点から、圧縮ゴム層全体がグラフェン類を含むゴム組成物で形成された圧縮ゴム層が好ましい。
[Compressed rubber layer]
In the present invention, since the friction transmission surface of the compressed rubber layer is formed of a vulcanized product of a rubber composition containing a rubber component and graphenes, graphenes are present on at least a part of the friction transmission surface of the compression rubber layer. , The friction coefficient of the friction transmission surface can be reduced (sliding property is improved). The compressed rubber layer may have a friction transmission surface formed of the rubber composition. For example, on the friction transmission surface, a surface layer portion formed of a rubber composition containing graphenes is formed, and another portion (inner layer) is formed. Part) may be a compressed rubber layer containing no graphenes, but from the viewpoint of productivity and the like, a compressed rubber layer in which the entire compressed rubber layer is formed of a rubber composition containing graphenes is preferable.
(グラフェン類)
グラフェン類には、通常「グラフェン」と称される単一のシートであるグラフェンシートと、このグラフェンシートの積層体であるグラフェン膜(多層グラフェン)とが含まれる。
(Graphenes)
Graphenes include a graphene sheet, which is a single sheet usually called "graphene", and a graphene film (multilayer graphene), which is a laminate of the graphene sheets.
グラフェンシートは、グラファイトを構成する材料であり、1原子の厚さのsp2結合炭素原子のシート(単層のシート)である。その構造は、炭素原子とその結合から形成された蜂の巣のような六角形格子構造(ハニカム構造)を有している。 The graphene sheet is a material constituting graphite, and is a sheet of sp 2- bonded carbon atoms (single-layer sheet) having a thickness of 1 atom. The structure has a honeycomb-like hexagonal lattice structure (honeycomb structure) formed from carbon atoms and their bonds.
グラフェン膜は、グラファイトを剥離処理して得られ、グラファイトと比べて薄肉の積層体であり、結晶構造を有している。グラフェン膜の積層枚数は、例えば2〜20枚程度であり、好ましくは3〜10枚程度である。 The graphene film is obtained by peeling graphite, is a thin-walled laminate as compared with graphite, and has a crystal structure. The number of laminated graphene films is, for example, about 2 to 20, preferably about 3 to 10.
グラフェン膜のアスペクト比(板面の平均径/平均厚み)は20以上であってもよく、例えば20〜100000、好ましくは50〜30000、さらに好ましくは100〜10000程度である。グラフェン膜の平均厚みは、例えば1〜10nm、好ましくは1.5〜5nm程度であってもよい。 The aspect ratio (average diameter / average thickness of the plate surface) of the graphene film may be 20 or more, for example, 20 to 100,000, preferably 50 to 30,000, and more preferably about 100 to 10,000. The average thickness of the graphene film may be, for example, about 1 to 10 nm, preferably about 1.5 to 5 nm.
グラフェン類は、酸化グラフェンを含んでいてもよく、酸化グラフェンのみで形成されていてもよい。 Graphenes may contain graphene oxide, or may be formed only of graphene oxide.
グラフェン類の形状は、特に限定されず、例えば、シート状、粒状(粉末状又は不定形状)、シート状と粒状とを組み合わせた形状などが挙げられる。これらの形状のうち、取り扱い性に優れ、樹脂成分中に均一に分散し易い点から、粒状が好ましい。 The shape of graphenes is not particularly limited, and examples thereof include sheet-like, granular (powder-like or indefinite-shaped), and a combination of sheet-like and granular. Of these shapes, granules are preferable because they are easy to handle and can be easily dispersed uniformly in the resin component.
グラフェン類が粒状である場合、グラフェン類の平均粒子径は50μm以下であってもよく、例えば0.01〜50μm、好ましくは0.03〜10μm、さらに好ましくは0.05〜5μm(特に0.1〜3μm)程度である。平均粒子径が小さすぎると、ゴム成分に配合する際に飛散して取り扱い性が低下する虞があり、大きすぎると、ゴム成分中で凝集塊が形成され易くなり、均一に分散させるのが困難となる虞がある。 When the graphenes are granular, the average particle size of the graphenes may be 50 μm or less, for example 0.01 to 50 μm, preferably 0.03 to 10 μm, more preferably 0.05 to 5 μm (particularly 0. It is about 1 to 3 μm). If the average particle size is too small, it may scatter when blended with the rubber component and the handleability may be deteriorated. If the average particle size is too large, agglomerates are likely to be formed in the rubber component and it is difficult to disperse them uniformly. There is a risk of becoming.
なお、本明細書及び特許請求の範囲において、グラフェン類の平均粒子径は、走査型電子顕微鏡(日本電子(株)製「JSM−5900LV」)で5000倍に拡大して観察し、無作為20個の粒子径を測定し、平均化する方法で求めることができる。 In the present specification and claims, the average particle size of graphenes is observed with a scanning electron microscope (“JSM-5900LV” manufactured by JEOL Ltd.) at a magnification of 5000 times, and is randomly 20. It can be determined by a method of measuring the particle size of individual particles and averaging them.
グラフェン類は、慣用の方法で製造でき、例えば、特許第5688669号公報、特許第5697067号公報、特開2015−501873号公報、WO2013/146213号パンフレットに記載の方法などにより製造してもよい。 Graphenes can be produced by a conventional method, and may be produced, for example, by the methods described in Japanese Patent No. 5688669, Japanese Patent No. 5697067, Japanese Patent Application Laid-Open No. 2015-501873, and WO2013 / 146213.
グラフェン類の割合は、ゴム成分100質量部に対して0.1〜15質量部(例えば0.1〜10質量部)程度の範囲から選択でき、例えば0.2〜10質量部、好ましくは0.3〜8質量部、さらに好ましくは0.5〜5質量部(特に0.8〜3質量部)程度である。 The ratio of graphenes can be selected from the range of about 0.1 to 15 parts by mass (for example, 0.1 to 10 parts by mass) with respect to 100 parts by mass of the rubber component, for example, 0.2 to 10 parts by mass, preferably 0. .3 to 8 parts by mass, more preferably about 0.5 to 5 parts by mass (particularly 0.8 to 3 parts by mass).
ゴム組成物が短繊維を含む場合、グラフェン類の割合は、短繊維100質量部に対して、例えば0.5〜100質量部、好ましくは1〜50質量部、さらに好ましくは3〜40質量部(特に5〜30質量部)程度である。ゴム組成物が慣用の固体潤滑剤及び/又は摩擦調整剤を含む場合、前記グラフェン類の割合は、固体潤滑剤及び摩擦調整剤の合計100質量部に対して、例えば1〜50質量部、好ましくは1.5〜30質量部、さらに好ましくは2〜20質量部(特に3〜15質量部)程度である。 When the rubber composition contains short fibers, the ratio of graphenes is, for example, 0.5 to 100 parts by mass, preferably 1 to 50 parts by mass, and more preferably 3 to 40 parts by mass with respect to 100 parts by mass of the short fibers. It is about (particularly 5 to 30 parts by mass). When the rubber composition contains a conventional solid lubricant and / or friction modifier, the proportion of the graphenes is preferably 1 to 50 parts by mass, for example, with respect to 100 parts by mass of the total of the solid lubricant and the friction modifier. Is about 1.5 to 30 parts by mass, more preferably about 2 to 20 parts by mass (particularly about 3 to 15 parts by mass).
これらのグラフェン類の割合において、グラフェン類の割合が少なすぎると、摩擦係数を低減する効果が少なくなる虞があり、多すぎると、摩擦係数が低くなりすぎてベルトがスリップし、省燃費性が低下する虞があるとともに、スリップによる発熱に伴って耐久性が低下する虞もある。なお、これらのグラフェン類の割合は、圧縮ゴム層が摩擦伝動面に形成されたグラフェン類とゴム成分とを含むゴム組成物で形成された表層部と他の部分(内層部)とで形成されている場合、表層部を形成するゴム組成物における割合である。 In the ratio of these graphenes, if the ratio of graphenes is too small, the effect of reducing the friction coefficient may be reduced, and if it is too large, the friction coefficient becomes too low and the belt slips, resulting in fuel saving. In addition to the risk of deterioration, the durability may also be reduced due to heat generated by slipping. The ratio of these graphenes is formed by a surface layer portion and other portions (inner layer portions) formed of a rubber composition containing graphenes and rubber components formed on the friction transmission surface of the compressed rubber layer. If so, it is the ratio in the rubber composition forming the surface layer portion.
(短繊維)
本発明では、摩擦伝動面を形成するゴム組成物が短繊維を含んでいなくてもよいが、前記グラフェン類に加えて、短繊維をさらに含むのが好ましい。プーリからの側圧と摩擦力を大きく受ける圧縮ゴム層を形成するゴム組成物に短繊維を配合し、好ましくは短繊維をベルト幅方向に配向させることにより、摩擦伝動ベルトの耐側圧性を確保できる。一方で、ベルトの耐久性の点からは、短繊維の割合は耐側圧性を確保するだけの必要最小限とするのが好ましい。本発明では、グラフェン類の存在により、短繊維の割合を必要最小限に調整できるため、耐側圧性を維持したままベルトの曲げ剛性も小さく維持できる。そのため、摩擦係数(摺動性向上)及び曲げ剛性(柔軟性の向上)の両者を低減でき、伝達ロスが小さく省燃費性を確保できる。すなわち、短繊維とグラフェン類とを併用すると、耐側圧性と省燃費性(柔軟性と摺動性との両方)とを向上できる。
(Short fiber)
In the present invention, the rubber composition forming the friction transmission surface does not have to contain short fibers, but it is preferable that the rubber composition further contains short fibers in addition to the graphenes. The lateral pressure resistance of the friction transmission belt can be ensured by blending short fibers with the rubber composition forming the compressed rubber layer that receives a large amount of lateral pressure and frictional force from the pulley, and preferably by orienting the short fibers in the belt width direction. .. On the other hand, from the viewpoint of belt durability, it is preferable that the ratio of short fibers is the minimum necessary to ensure lateral pressure resistance. In the present invention, the proportion of short fibers can be adjusted to the minimum necessary due to the presence of graphenes, so that the bending rigidity of the belt can be kept small while maintaining the lateral pressure resistance. Therefore, both the coefficient of friction (improvement of slidability) and flexural rigidity (improvement of flexibility) can be reduced, transmission loss is small, and fuel efficiency can be ensured. That is, when short fibers and graphenes are used in combination, lateral pressure resistance and fuel saving (both flexibility and slidability) can be improved.
短繊維としては、例えば、ポリオレフィン系繊維(ポリエチレン繊維、ポリプロピレン繊維など)、ポリアミド繊維(ポリアミド6繊維、ポリアミド66繊維、ポリアミド46繊維、アラミド繊維など)、ポリアルキレンアリレート系繊維[ポリエチレンテレフタレート(PET)繊維、ポリエチレンナフタレート(PEN)繊維などのポリC2−4アルキレンC6−14アリレート系繊維など]、ビニロン繊維、ポリビニルアルコール系繊維、ポリパラフェニレンベンゾビスオキサゾール(PBO)繊維などの合成繊維;綿、麻、羊毛などの天然繊維;炭素繊維などの無機繊維などが汎用される。これらの短繊維は、単独で又は二種以上組み合わせて使用できる。これらの短繊維のうち、合成繊維や天然繊維、特に合成繊維(ポリアミド繊維、ポリアルキレンアリレート系繊維など)、中でも剛直で高い強度及びモジュラスを有し、圧縮ゴム層表面で突出し易い点から、少なくともアラミド繊維を含む短繊維が好ましい。アラミド短繊維は、高い耐摩耗性をも有している。アラミド繊維は、例えば、商品名「コーネックス」、「ノーメックス」、「ケブラー」、「テクノーラ」、「トワロン」などとして市販されている。 Examples of short fibers include polyolefin fibers (polyethylene fiber, polypropylene fiber, etc.), polyamide fibers (polyamide 6 fiber, polyamide 66 fiber, polyamide 46 fiber, aramid fiber, etc.), polyalkylene allylate fiber [polyethylene terephthalate (PET)). Fibers, poly C 2-4 alkylene C 6-14 allylate fibers such as polyethylene naphthalate (PEN) fibers], vinylon fibers, polyvinyl alcohol fibers, synthetic fibers such as polyparaphenylene benzobisoxazole (PBO) fibers; Natural fibers such as cotton, hemp and wool; inorganic fibers such as carbon fibers are widely used. These short fibers can be used alone or in combination of two or more. Of these short fibers, synthetic fibers and natural fibers, especially synthetic fibers (polyamide fibers, polyalkylene allylate fibers, etc.), among others, are rigid, have high strength and modulus, and easily protrude on the surface of the compressed rubber layer, so at least Short fibers containing aramid fibers are preferred. Aramid short fibers also have high wear resistance. Aramid fibers are commercially available, for example, under the trade names "Cornex", "Nomex", "Kevlar", "Technora", "Twaron" and the like.
短繊維は、プーリからの押圧に対するベルトの圧縮変形を抑制するため、ベルト幅方向に配向して圧縮ゴム層中に埋設される。また、圧縮ゴム層の表面より短繊維を突出させることにより、表面の摩擦係数を低下させてノイズ(発音)を抑制したり、プーリとの擦れによる摩耗を低減できる。短繊維の平均長さは、例えば1〜20mm、好ましくは1.2〜15mm(例えば1.5〜10mm)、さらに好ましくは2〜5mm(特に2.5〜4mm)程度であってもよい。短繊維の平均長さが短すぎると、列理方向の力学特性(例えばモジュラスなど)を十分に高めることができない虞があり、逆に長すぎると、ゴム組成物中の短繊維の分散不良が生じ、ゴムに亀裂が発生してベルトが早期に損傷する虞がある。 The short fibers are oriented in the belt width direction and embedded in the compressed rubber layer in order to suppress the compressive deformation of the belt due to the pressure from the pulley. Further, by projecting the short fibers from the surface of the compressed rubber layer, the friction coefficient of the surface can be lowered to suppress noise (pronunciation), and wear due to rubbing against the pulley can be reduced. The average length of the short fibers may be, for example, 1 to 20 mm, preferably 1.2 to 15 mm (for example, 1.5 to 10 mm), and more preferably 2 to 5 mm (particularly 2.5 to 4 mm). If the average length of the short fibers is too short, the mechanical properties in the columnar direction (for example, modulus) may not be sufficiently enhanced, and if it is too long, the short fibers in the rubber composition may be poorly dispersed. As a result, the rubber may crack and the belt may be damaged prematurely.
摩擦伝動面全体における短繊維の平均突出高さは、50μm以上であればよく、例えば50〜200μm、好ましくは60〜180μm、さらに好ましくは70〜160μm(特に80〜150μm)程度である。平均突出高さが小さすぎると、表面の摩擦係数を充分に低減できない虞があり、逆に大きすぎると、破損や脱落が起こり易くなる。平均突出高さは、例えば、ベルト幅方向に切断した断面を電子顕微鏡などで拡大観察し、ベルト側面より突出する短繊維の長さ(突出高さ)を複数本(例えば10〜1000本、好ましくは30〜500本、さらに好ましくは50〜200本、特に100本程度)測定し、これらを平均して算出することができる。 The average protruding height of the short fibers on the entire friction transmission surface may be 50 μm or more, for example, 50 to 200 μm, preferably 60 to 180 μm, and more preferably 70 to 160 μm (particularly 80 to 150 μm). If the average protrusion height is too small, the friction coefficient of the surface may not be sufficiently reduced, and conversely, if it is too large, breakage or dropout is likely to occur. For the average protrusion height, for example, a cross section cut in the belt width direction is magnified and observed with an electron microscope or the like, and a plurality of short fibers (protrusion height) protruding from the side surface of the belt are formed (for example, 10 to 1000 fibers, preferably 10 to 1000). 30 to 500 lines, more preferably 50 to 200 lines, particularly about 100 lines), and these can be averaged and calculated.
短繊維の平均繊維径は、例えば1〜100μm、好ましくは3〜50μm、さらに好ましくは5〜30μm(特に10〜20μm)程度である。平均繊維径が大きすぎると、圧縮ゴム層の機械的特性が低下する虞があり、小さすぎると、表面の摩擦係数を充分に低減できない虞がある。 The average fiber diameter of the short fibers is, for example, 1 to 100 μm, preferably 3 to 50 μm, and more preferably 5 to 30 μm (particularly 10 to 20 μm). If the average fiber diameter is too large, the mechanical properties of the compressed rubber layer may deteriorate, and if it is too small, the friction coefficient of the surface may not be sufficiently reduced.
突出部における短繊維の形状は、特に限定されず、側面より略垂直に突出した形状、一方向(例えば、研磨方向)にカールした形状、先端部がフィブリル化した形状、研磨時の熱で溶融した開花状などの形状であってもよい。さらに、特開平7−98044号公報や特開平7−151191号公報に記載された形状であってもよい。 The shape of the short fibers in the protruding portion is not particularly limited, and is a shape protruding substantially vertically from the side surface, a shape curled in one direction (for example, the polishing direction), a shape in which the tip is fibrillated, and melted by heat during polishing. It may have a shape such as a flowering shape. Further, the shape may be described in JP-A-7-98044 and JP-A-7-151191.
本発明では、摩擦伝動面に存在するグラフェン類との組み合わせにより、短繊維の割合を少量に抑制できるため、ベルトの曲げ剛性を低下でき、ベルトの伝達効率を向上できる。短繊維の割合は、ゴム成分100質量部に対して50質量部以下(例えば40質量部以下、好ましくは30質量部以下)であってもよく、例えば10〜25質量部、好ましくは12〜23質量部、さらに好ましくは15〜20質量部程度であってもよく、例えば10〜20質量部(特に12〜18質量部)程度であってもよい。短繊維の割合が少なすぎると、圧縮ゴム層の力学特性が低下する虞がある。逆に多すぎると、伝達効率の低下に加えて、短繊維のゴム組成物中の分散性が低下して分散不良が生じ、その箇所を起点にして圧縮ゴム層に亀裂が早期に発生する虞もある。なお、耐久性が重要な用途においては、短繊維の割合は、ゴム成分100質量部に対して、20質量部以下(例えば0〜20質量部)であってもよく、例えば15質量部以下(例えば0〜10質量部)、好ましくは5質量部以下(例えば0〜3質量部)、さらに好ましくは1質量部以下(0〜0.5質量部)程度であってもよく、実質的に短繊維を含んでいなくてもよい。 In the present invention, the proportion of short fibers can be suppressed to a small amount by combining with graphenes existing on the friction transmission surface, so that the bending rigidity of the belt can be reduced and the transmission efficiency of the belt can be improved. The ratio of the short fibers may be 50 parts by mass or less (for example, 40 parts by mass or less, preferably 30 parts by mass or less) with respect to 100 parts by mass of the rubber component, for example, 10 to 25 parts by mass, preferably 12 to 23 parts by mass. It may be about 15 to 20 parts by mass, more preferably about 15 to 20 parts by mass, and for example, about 10 to 20 parts by mass (particularly about 12 to 18 parts by mass). If the proportion of short fibers is too small, the mechanical properties of the compressed rubber layer may deteriorate. On the other hand, if the amount is too large, in addition to the decrease in transmission efficiency, the dispersibility in the rubber composition of the short fibers is reduced, resulting in poor dispersion, and there is a risk that cracks will occur in the compressed rubber layer at an early stage starting from that location. There is also. In applications where durability is important, the proportion of short fibers may be 20 parts by mass or less (for example, 0 to 20 parts by mass) with respect to 100 parts by mass of the rubber component, for example, 15 parts by mass or less (for example). For example, 0 to 10 parts by mass), preferably 5 parts by mass or less (for example, 0 to 3 parts by mass), more preferably 1 part by mass or less (0 to 0.5 parts by mass), which is substantially short. It does not have to contain fibers.
ゴム組成物中の短繊維の分散性や接着性の観点から、少なくとも短繊維は接着処理(又は表面処理)するのが好ましい。なお、全ての短繊維が接着処理されている必要はなく、接着処理した短繊維と、接着処理されていない短繊維(未処理短繊維)とが混在し又は併用されていてもよい。 From the viewpoint of dispersibility and adhesiveness of the short fibers in the rubber composition, it is preferable that at least the short fibers are adhesively treated (or surface treated). It is not necessary that all the short fibers are bonded, and the bonded short fibers and the non-bonded short fibers (untreated short fibers) may be mixed or used in combination.
短繊維の接着処理では、種々の接着処理、例えば、フェノール類とホルマリンとの初期縮合物(ノボラック又はレゾール型フェノール樹脂のプレポリマーなど)を含む処理液、ゴム成分(又はラテックス)を含む処理液、前記初期縮合物とゴム成分(ラテックス)とを含む処理液、シランカップリング剤、エポキシ化合物(エポキシ樹脂など)、イソシアネート化合物などの反応性化合物(接着性化合物)を含む処理液などで処理することができる。好ましい接着処理では、短繊維は、前記初期縮合物とゴム成分(ラテックス)とを含む処理液、特に少なくともレゾルシン−ホルマリン−ラテックス(RFL)液で処理する。このような処理液は組み合わせて使用してもよく、例えば、短繊維を、慣用の接着性成分、例えば、エポキシ化合物(エポキシ樹脂など)、イソシアネート化合物などの反応性化合物(接着性化合物)で前処理した後、RFL液で処理してもよい。 In the adhesion treatment of short fibers, various adhesion treatments, for example, a treatment liquid containing an initial condensate of phenols and formalin (such as a prepolymer of a novolak or a resole-type phenol resin), a treatment liquid containing a rubber component (or latex), etc. , Treatment liquid containing the initial condensate and rubber component (latex), silane coupling agent, epoxy compound (epoxy resin, etc.), treatment liquid containing reactive compound (adhesive compound) such as isocyanate compound, etc. be able to. In a preferred adhesion treatment, the short fibers are treated with a treatment solution containing the initial condensate and a rubber component (latex), particularly at least a resorcin-formalin-latex (RFL) solution. Such treatment solutions may be used in combination, for example, the short fibers are preliminarily used with a conventional adhesive component, for example, a reactive compound (adhesive compound) such as an epoxy compound (epoxy resin or the like) or an isocyanate compound. After the treatment, it may be treated with an RFL solution.
このような処理液、特にRFL液で処理すると、短繊維とゴム成分とを強く接着できる。RFL液は、レゾルシンとホルムアルデヒドとの初期縮合物と、ゴムラテックスとの混合物である。レゾルシンとホルムアルデヒドとのモル比は、ゴム成分と短繊維との接着性を向上できる範囲、例えば、前者/後者=1/0.5〜1/3、好ましくは1/0.6〜1/2.5、さらに好ましくは1/0.7〜1/1.5程度に設定でき、1/0.5〜1/1(例えば1/0.6〜1/0.8)程度であってもよい。ラテックスの種類は特に限定されず、接着対象となるゴム成分の種類に応じて、後述するゴム成分から適宜選択できる。例えば、接着対象となるゴム成分がクロロプレンゴムを主成分とする場合、ラテックスは、ジエン系ゴム(天然ゴム、イソプレンゴム、ブタジエンゴム、クロロプレンゴム、スチレン−ブタジエンゴム(SBR)、スチレン−ブタジエン−ビニルピリジン三元共重合体、アクリロニトリル−ブタジエンゴム(ニトリルゴム)、水素化ニトリルゴムなど)、エチレン−α−オレフィンエラストマー、クロロスルホン化ポリエチレンゴム、アルキル化クロロスルホン化ポリエチレンゴムなどであってもよい。これらのラテックスは単独で又は2種以上組み合わせてもよい。好ましいラテックスは、ジエン系ゴム(スチレン−ブタジエン−ビニルピリジン三元共重合体、クロロプレンゴム、ブタジエンゴムなど)、クロロスルホン化ポリエチレンゴムであり、接着性を一層向上させる上ではスチレン−ブタジエン−ビニルピリジン三元共重合体が好ましい。短繊維を少なくともスチレン−ブタジエン−ビニルピリジン三元共重合体を含む処理液(RFL液など)で接着処理すると、ゴム組成物(クロロプレンゴム組成物など)と短繊維との接着性を向上できる。 When treated with such a treatment liquid, particularly an RFL liquid, the short fibers and the rubber component can be strongly adhered to each other. The RFL solution is a mixture of an initial condensate of resorcin and formaldehyde and a rubber latex. The molar ratio of resorcin to formaldehyde is within the range in which the adhesiveness between the rubber component and the short fibers can be improved, for example, the former / the latter = 1 / 0.5 to 1/3, preferably 1 / 0.6 to 1/2. It can be set to about 5.5, more preferably about 1 / 0.7 to 1 / 1.5, even if it is about 1 / 0.5 to 1/1 (for example, 1 / 0.6 to 1 / 0.8). Good. The type of latex is not particularly limited, and can be appropriately selected from the rubber components described later according to the type of rubber component to be adhered. For example, when the rubber component to be bonded is mainly chloroprene rubber, the latex is a diene rubber (natural rubber, isoprene rubber, butadiene rubber, chloroprene rubber, styrene-butadiene rubber (SBR), styrene-butadiene-vinyl). It may be a pyridine ternary copolymer, acrylonitrile-butadiene rubber (nitrile rubber), hydride nitrile rubber, etc.), ethylene-α-olefin elastomer, chlorosulfonated polyethylene rubber, alkylated chlorosulfonated polyethylene rubber, or the like. These latexes may be used alone or in combination of two or more. Preferred latexes are diene rubber (styrene-butadiene-vinylpyridine ternary copolymer, chloroprene rubber, butadiene rubber, etc.) and chlorosulfonated polyethylene rubber, and styrene-butadiene-vinylpyridine is used to further improve the adhesiveness. A ternary copolymer is preferable. When the short fibers are bonded with a treatment liquid (RFL liquid or the like) containing at least a styrene-butadiene-vinylpyridine ternary copolymer, the adhesiveness between the rubber composition (chloroprene rubber composition or the like) and the short fibers can be improved.
レゾルシンとホルマリンとの初期縮合物の割合は、ラテックスのゴム成分100質量部に対して10〜100質量部(例えば12〜50質量部、好ましくは15〜30質量部)程度であってもよい。なお、RFL液の全固形分濃度は、5〜40質量%の範囲で調整できる。 The ratio of the initial condensate of resorcin and formalin may be about 10 to 100 parts by mass (for example, 12 to 50 parts by mass, preferably 15 to 30 parts by mass) with respect to 100 parts by mass of the rubber component of the latex. The total solid content concentration of the RFL solution can be adjusted in the range of 5 to 40% by mass.
短繊維に対する接着成分(固形分)の付着率は、例えば1〜25質量%、好ましくは3〜20質量%、より好ましくは5〜15質量%であり、3〜10質量%(特に4〜8質量%)程度であってもよい。接着成分の付着率が少なすぎると、短繊維のゴム組成物中の分散性や、短繊維とゴム組成物との接着性が不十分であり、逆に多すぎると、接着成分が繊維フィラメント同士を強固に固着し、却って分散性が低下する虞がある。 The adhesion ratio of the adhesive component (solid content) to the short fibers is, for example, 1 to 25% by mass, preferably 3 to 20% by mass, more preferably 5 to 15% by mass, and 3 to 10% by mass (particularly 4 to 8%). It may be about mass%). If the adhesive component is too low, the dispersibility of the short fibers in the rubber composition and the adhesiveness between the short fibers and the rubber composition are insufficient, and conversely, if the adhesive component is too large, the adhesive components are fiber filaments. Is firmly fixed, and there is a risk that the dispersibility will decrease.
接着処理された短繊維の調製方法は特に限定されず、例えば、マルチフィラメントの長繊維を接着処理液に含浸し、乾燥させた後に所定長さにカットする方法、未処理短繊維を接着処理液に所定時間浸漬し、次いで、遠心分離などの方法で余剰の接着処理液を除去した後、乾燥させる方法などが利用できる。 The method for preparing the bonded short fibers is not particularly limited. For example, a method of impregnating the long fibers of the multifilament with the bonding liquid, drying the fibers and then cutting them to a predetermined length, or a method of cutting the untreated short fibers into the bonding liquid. A method can be used in which the adhesive is immersed in the fiber for a predetermined time, then the excess adhesive treatment liquid is removed by a method such as centrifugation, and then the adhesive is dried.
(ゴム成分)
ゴム成分としては、公知の加硫又は架橋可能なゴム成分及び/又はエラストマー、例えば、ジエン系ゴム[例えば、天然ゴム、イソプレンゴム、ブタジエンゴム、クロロプレンゴム(CR)、スチレン−ブタジエンゴム(SBR)、ビニルピリジン−スチレン−ブタジエン共重合体ゴム、アクリロニトリル−ブタジエンゴム(ニトリルゴム);水素化ニトリルゴム(水素化ニトリルゴムと不飽和カルボン酸金属塩との混合ポリマーを含む)などの前記ジエン系ゴムの水添物など]、オレフィン系ゴム[例えば、エチレン−α−オレフィン系ゴム(エチレン−α−オレフィンエラストマー)、ポリオクテニレンゴム、エチレン−酢酸ビニル共重合体ゴム、クロロスルホン化ポリエチレンゴム、アルキル化クロロスルホン化ポリエチレンゴムなど]、エピクロルヒドリンゴム、アクリル系ゴム、シリコーンゴム、ウレタンゴム、フッ素ゴムなどが例示できる。これらのゴム成分は単独で又は二種以上組み合わせて使用することができる。
(Rubber component)
Examples of the rubber component include known vulverable or crosslinkable rubber components and / or elastomers, for example, diene rubber [for example, natural rubber, isoprene rubber, butadiene rubber, chloroprene rubber (CR), styrene-butadiene rubber (SBR)). , Vinyl pyridine-styrene-butadiene copolymer rubber, acrylonitrile-butadiene rubber (nitrile rubber); the diene rubber such as hydride nitrile rubber (including a mixed polymer of hydride nitrile rubber and unsaturated carboxylic acid metal salt). , Etc.], olefin rubber [for example, ethylene-α-olefin rubber (ethylene-α-olefin elastomer), polyoctenylene rubber, ethylene-vinyl acetate copolymer rubber, chlorosulfonated polyethylene rubber, alkyl Chlorosulfonated polyethylene rubber, etc.], epichlorohydrin rubber, acrylic rubber, silicone rubber, urethane rubber, fluorine rubber, etc. can be exemplified. These rubber components can be used alone or in combination of two or more.
これらのゴム成分のうち、加硫剤及び加硫促進剤が拡散し易い点から、エチレン−α−オレフィンエラストマー(エチレン−プロピレン共重合体(EPM)、エチレン−プロピレン−ジエン三元共重合体(EPDM)などのエチレン−α−オレフィン系ゴム)、クロロプレンゴムが汎用され、特に、変速ベルトなど高負荷環境で用いる場合、機械的強度、耐候性、耐熱性、耐寒性、耐油性、接着性などのバランスに優れる点から、クロロプレンゴム、EPDMが好ましい。さらに、前記特性に加えて、耐摩耗性にも優れる点から、クロロプレンゴムが特に好ましい。クロロプレンゴムは、硫黄変性タイプであってもよく、非硫黄変性タイプであってもよい。 Among these rubber components, ethylene-α-olefin elastomer (ethylene-propylene copolymer (EPM), ethylene-propylene-diene ternary copolymer (ethylene-propylene-diene ternary copolymer)) because the vulcanizing agent and the vulcanization accelerator are easily diffused. Ethylene-α-olefin rubber such as EPDM) and chloroprene rubber are widely used, and especially when used in a high load environment such as a speed change belt, mechanical strength, weather resistance, heat resistance, cold resistance, oil resistance, adhesiveness, etc. Chloroprene rubber and EPDM are preferable from the viewpoint of excellent balance. Further, chloroprene rubber is particularly preferable because it is excellent in wear resistance in addition to the above-mentioned characteristics. The chloroprene rubber may be a sulfur-modified type or a non-sulfur-modified type.
ゴム成分がクロロプレンゴムを含む場合、ゴム成分中のクロロプレンゴムの割合は50質量%以上(特に80〜100質量%)程度であってもよく、100質量%(クロロプレンゴムのみ)が特に好ましい。 When the rubber component contains chloroprene rubber, the proportion of chloroprene rubber in the rubber component may be about 50% by mass or more (particularly 80 to 100% by mass), and 100% by mass (only chloroprene rubber) is particularly preferable.
(固体潤滑剤及び/又は摩擦調整剤)
ゴム組成物は、慣用の固体潤滑剤及び/又は摩擦調整剤をさらに含んでいてもよい。本発明では、グラフェン類を慣用の固体潤滑剤及び/又は摩擦調整剤と組み合わせることにより、ベルトの耐久性を低下させずに、摩擦伝動面の摩擦係数を低減できる。
(Solid lubricant and / or friction modifier)
The rubber composition may further comprise a conventional solid lubricant and / or friction modifier. In the present invention, by combining graphenes with a conventional solid lubricant and / or friction modifier, the friction coefficient of the friction transmission surface can be reduced without lowering the durability of the belt.
慣用の固体潤滑剤としては、例えば、グラファイト、フッ素樹脂(ポリテトラフルオロエチレンなど)、二硫化モリブデン、超高分子量ポリエチレンなどが挙げられる。これらの固体潤滑剤は、単独で又は二種以上組み合わせて使用できる。摩擦調整剤としては、無機粉粒体、例えば、炭酸カルシウム、リン酸カルシウム、チタン酸カリウム、ホウ酸アルミニウム、アルミナ、シリカ、マイカ、タルク(含水ケイ酸マグネシウム)、鉄粉、酸化チタン、パイロフィライト(ろう石クレー)等が挙げられる。これらの摩擦調整剤は、単独で又は二種以上組み合わせて使用できる。 Examples of conventional solid lubricants include graphite, fluororesin (polytetrafluoroethylene, etc.), molybdenum disulfide, ultra-high molecular weight polyethylene, and the like. These solid lubricants can be used alone or in combination of two or more. As the friction modifier, inorganic powders and granules such as calcium carbonate, calcium phosphate, potassium titanate, aluminum borate, alumina, silica, mica, talc (hydrous magnesium silicate), iron powder, titanium oxide, pyrophyllite ( Rouseki clay) and the like. These friction modifiers can be used alone or in combination of two or more.
これらのうち、グラファイト、フッ素樹脂、超高分子量ポリエチレンなどの固体潤滑剤が好ましい。 Of these, solid lubricants such as graphite, fluororesin, and ultra-high molecular weight polyethylene are preferable.
固体潤滑剤及び摩擦調整剤の合計割合は、ゴム成分100質量部に対して50質量部以下であってもよく、例えば1〜50質量部、好ましくは3〜40質量部、さらに好ましくは5〜30質量部(特に10〜20質量部)程度である。固体潤滑剤及び摩擦調整剤の割合が多すぎると、ベルト耐久性が低下する虞がある。 The total ratio of the solid lubricant and the friction modifier may be 50 parts by mass or less with respect to 100 parts by mass of the rubber component, for example, 1 to 50 parts by mass, preferably 3 to 40 parts by mass, and more preferably 5 to 5 parts by mass. It is about 30 parts by mass (particularly 10 to 20 parts by mass). If the ratio of the solid lubricant and the friction modifier is too large, the belt durability may decrease.
(添加剤)
ゴム組成物には、必要に応じて、加硫剤又は架橋剤(又は架橋剤系)、共架橋剤、加硫助剤、加硫促進剤、加硫遅延剤、金属酸化物(例えば、酸化亜鉛、酸化マグネシウム、酸化カルシウム、酸化バリウム、酸化鉄、酸化銅など)、増強剤(カーボンブラックなど)、充填剤、軟化剤(パラフィンオイル、ナフテン系オイルなどのオイル類など)、加工剤又は加工助剤(ステアリン酸などの脂肪酸、ステアリン酸金属塩などの脂肪酸金属塩、ステアリン酸アマイドなどの脂肪酸アマイド、ワックス、パラフィンなど)、老化防止剤(酸化防止剤、熱老化防止剤、屈曲き裂防止剤、オゾン劣化防止剤など)、着色剤、粘着付与剤、可塑剤、滑剤、カップリング剤(シランカップリング剤など)、安定剤(紫外線吸収剤、熱安定剤など)、難燃剤、帯電防止剤などを含んでいてもよい。なお、金属酸化物は架橋剤として作用してもよい。
(Additive)
The rubber composition contains, if necessary, a vulcanizing agent or a cross-linking agent (or a cross-linking agent system), a co-cross-linking agent, a vulcanization aid, a vulcanization accelerator, a vulcanization retarder, and a metal oxide (for example, oxidation). Zinc, magnesium oxide, calcium oxide, barium oxide, iron oxide, copper oxide, etc.), enhancer (carbon black, etc.), filler, softener (oils such as paraffin oil, naphthenic oil, etc.), processing agent or processing Auxiliary agents (fatty acids such as stearic acid, metal fatty acid salts such as metal stearic acid, fatty acid amides such as stearic acid amide, wax, paraffin, etc.), antiaging agents (antioxidants, heat antiaging agents, bending crack prevention) Agents, ozone deterioration inhibitors, etc.), colorants, tackifiers, plasticizers, lubricants, coupling agents (silane coupling agents, etc.), stabilizers (ultraviolet absorbers, heat stabilizers, etc.), flame retardants, antistatic agents It may contain an agent or the like. The metal oxide may act as a cross-linking agent.
加硫剤又は架橋剤としては、ゴム成分の種類に応じて慣用の成分が使用でき、例えば、前記金属酸化物(酸化マグネシウム、酸化亜鉛など)、有機過酸化物(ジアシルパーオキサイド、パーオキシエステル、ジアルキルパーオキサイドなど)、硫黄系加硫剤などが例示できる。硫黄系加硫剤としては、例えば、粉末硫黄、沈降硫黄、コロイド硫黄、不溶性硫黄、高分散性硫黄、塩化硫黄(一塩化硫黄、二塩化硫黄など)などが挙げられる。これらの架橋剤又は加硫剤は単独で又は二種以上組み合わせて使用してもよい。ゴム成分がクロロプレンゴムである場合、加硫剤又は架橋剤として金属酸化物(酸化マグネシウム、酸化亜鉛など)を使用してもよい。なお、金属酸化物は他の加硫剤(硫黄系加硫剤など)と組合せて使用してもよく、金属酸化物及び/又は硫黄系加硫剤は単独で又は加硫促進剤と組み合わせて使用してもよい。 As the vulcanizing agent or the cross-linking agent, conventional components can be used depending on the type of rubber component. For example, the metal oxide (magnesium oxide, zinc oxide, etc.) and the organic peroxide (diacyl peroxide, peroxy ester) can be used. , Dialkyl peroxide, etc.), sulfur-based vulcanizer, etc. can be exemplified. Examples of the sulfur-based sulfurizing agent include powdered sulfur, precipitated sulfur, colloidal sulfur, insoluble sulfur, highly dispersible sulfur, and sulfur chloride (sulfur monochloride, sulfur dichloride, etc.). These cross-linking agents or vulcanizing agents may be used alone or in combination of two or more. When the rubber component is chloroprene rubber, a metal oxide (magnesium oxide, zinc oxide, etc.) may be used as a vulcanizing agent or a cross-linking agent. The metal oxide may be used in combination with another vulcanizing agent (sulfur-based vulcanizing agent, etc.), and the metal oxide and / or the sulfur-based vulcanizing agent may be used alone or in combination with a vulcanization accelerator. You may use it.
加硫剤の割合は、加硫剤及びゴム成分の種類に応じて、ゴム成分100質量部に対して1〜20質量部程度の範囲から選択できる。例えば、加硫剤としての有機過酸化物の割合は、ゴム成分100質量部に対して1〜8質量部、好ましくは1.5〜5質量部、さらに好ましくは2〜4.5質量部程度の範囲から選択でき、金属酸化物の割合は、ゴム成分100質量部に対して1〜20質量部、好ましくは3〜17質量部、さらに好ましくは5〜15質量部(特に7〜13質量部)程度の範囲から選択できる。 The ratio of the vulcanizing agent can be selected from the range of about 1 to 20 parts by mass with respect to 100 parts by mass of the rubber component, depending on the type of the vulcanizing agent and the rubber component. For example, the ratio of the organic peroxide as a sulfide is about 1 to 8 parts by mass, preferably 1.5 to 5 parts by mass, and more preferably about 2 to 4.5 parts by mass with respect to 100 parts by mass of the rubber component. The ratio of the metal oxide can be selected from the above range of 1 to 20 parts by mass, preferably 3 to 17 parts by mass, and more preferably 5 to 15 parts by mass (particularly 7 to 13 parts by mass) with respect to 100 parts by mass of the rubber component. ) Can be selected from the range.
共架橋剤(架橋助剤、又は共加硫剤co-agent)としては、公知の架橋助剤、例えば、多官能(イソ)シアヌレート[例えば、トリアリルイソシアヌレート(TAIC)、トリアリルシアヌレート(TAC)など]、ポリジエン(例えば、1,2−ポリブタジエンなど)、不飽和カルボン酸の金属塩[例えば、(メタ)アクリル酸亜鉛、(メタ)アクリル酸マグネシウムなど]、オキシム類(例えば、キノンジオキシムなど)、グアニジン類(例えば、ジフェニルグアニジン、ジo−トリルグアニジンなど)、多官能(メタ)アクリレート[例えば、エチレングリコールジ(メタ)アクリレート、ブタンジオールジ(メタ)アクリレート、トリメチロールプロパントリ(メタ)アクリレートなど]、ビスマレイミド類(脂肪族ビスマレイミド、例えば、N,N’−1,2−エチレンジマレイミド、1,6’−ビスマレイミド−(2,2,4−トリメチル)シクロヘキサンなど;アレーンビスマレイミド又は芳香族ビスマレイミド、例えば、N,N’−m−フェニレンジマレイミド、4−メチル−1,3−フェニレンジマレイミド、4,4’−ジフェニルメタンジマレイミド、2,2−ビス[4−(4−マレイミドフェノキシ)フェニル]プロパン、4,4’−ジフェニルエーテルジマレイミド、4,4’−ジフェニルスルフォンジマレイミド、1,3−ビス(3−マレイミドフェノキシ)ベンゼンなど)などが挙げられる。これらの架橋助剤は、単独で又は二種以上組み合わせて使用できる。これらの架橋助剤のうち、ビスマレイミド類(N,N’−m−フェニレンジマレイミドなどのアレーンビスマレイミド又は芳香族ビスマレイミド)が好ましい。ビスマレイミド類の添加により架橋度を高め、粘着摩耗などを防止できる。 Examples of the co-crosslinking agent (cross-linking aid or co-sulfurizing agent co-agent) include known cross-linking aids such as polyfunctional (iso) cyanurate [for example, triallyl isocyanurate (TAIC) and triallyl cyanurate (eg, triallyl isocyanurate (TAIC)). TAC), etc.], polydiene (eg, 1,2-polybutadiene, etc.), metal salts of unsaturated carboxylic acids [eg, zinc (meth) acrylate, magnesium (meth) acrylate, etc.], oximes (eg, quinonedi). Oxym, etc.), guanidines (eg, diphenylguanidine, dio-tolylguanidine, etc.), polyfunctional (meth) acrylates [eg, ethylene glycol di (meth) acrylate, butanediol di (meth) acrylate, trimethyl propantri (eg, trimethylol propantri) Meta) acrylates, etc.], bismaleimides (aliphatic bismaleimides such as N, N'-1,2-ethylene dimaleimide, 1,6'-bismaleimide- (2,2,4-trimethyl) cyclohexane, etc .; Arene bismaleimide or aromatic bismaleimide, such as N, N'-m-phenylenedimaleimide, 4-methyl-1,3-phenylenedimaleimide, 4,4'-diphenylmethanedimaleimide, 2,2-bis [4] -(4-Maleimide phenoxy) phenyl] propane, 4,4'-diphenyl ether dimaleimide, 4,4'-diphenylsulphon dimaleimide, 1,3-bis (3-maleimide phenoxy) benzene, etc.) and the like. These cross-linking aids can be used alone or in combination of two or more. Among these cross-linking aids, bismaleimides (alene bismaleimide such as N, N'-m-phenylenedimaleimide or aromatic bismaleimide) are preferable. By adding bismaleimides, the degree of cross-linking can be increased and adhesive wear can be prevented.
共架橋剤(架橋助剤)の割合は、固形分換算で、ゴム成分100質量部に対して0.01〜10質量部程度の範囲から選択でき、例えば0.1〜10質量部(例えば0.3〜8質量部)、好ましくは0.5〜6質量部(特に1〜5質量部)程度であってもよい。 The ratio of the co-crosslinking agent (crosslinking aid) can be selected from the range of about 0.01 to 10 parts by mass with respect to 100 parts by mass of the rubber component in terms of solid content, for example, 0.1 to 10 parts by mass (for example, 0). .3 to 8 parts by mass), preferably about 0.5 to 6 parts by mass (particularly 1 to 5 parts by mass).
加硫促進剤としては、例えば、チウラム系促進剤[例えば、テトラメチルチウラム・モノスルフィド(TMTM)、テトラメチルチウラム・ジスルフィド(TMTD)、テトラエチルチウラム・ジスルフィド(TETD)、テトラブチルチウラム・ジスルフィド(TBTD)、ジペンタメチレンチウラムテトラスルフィド(DPTT)、N,N’−ジメチル−N,N’−ジフェニルチウラム・ジスルフィドなど]、チアゾ−ル系促進剤[例えば、2−メルカプトベンゾチアゾ−ル、2−メルカプトベンゾチアゾ−ルの亜鉛塩、2−メルカプトチアゾリン、ジベンゾチアジル・ジスルフィド、2−(4’−モルホリノジチオ)ベンゾチアゾールなど]、スルフェンアミド系促進剤[例えば、N−シクロヘキシル−2−ベンゾチアジルスルフェンアミド(CBS)、N,N’−ジシクロヘキシル−2−ベンゾチアジルスルフェンアミドなど]、ウレア系又はチオウレア系促進剤(例えば、エチレンチオウレアなど)、ジチオカルバミン酸塩類、キサントゲン酸塩類などが挙げられる。これらの加硫促進剤は、単独で又は二種以上組み合わせて使用できる。これらの加硫促進剤のうち、TMTD、DPTT、CBSなどが汎用される。 Examples of the sulfide accelerator include thiuram-based accelerators [for example, tetramethylthiuram monosulfide (TMTM), tetramethylthiuram disulfide (TMTD), tetraethylthiuram disulfide (TETD), tetrabutylthiuram disulfide (TBTD). ), Dipentamethylene thiuram tetrasulfide (DPTT), N, N'-dimethyl-N, N'-diphenylthiuram disulfide, etc.], thiazol-based accelerators [eg, 2-mercaptobenzothiazol, 2 -Zinc salt of mercaptobenzothiazol, 2-mercaptothiazolin, dibenzothiazil disulfide, 2- (4'-morpholinodithio) benzothiazole, etc.], sulfenamide-based accelerator [for example, N-cyclohexyl-2 -Benzothiazyl sulphenamide (CBS), N, N'-dicyclohexyl-2-benzothiazyl sulphenamide, etc.], urea-based or thiourea-based accelerators (eg, ethylene thiourea, etc.), dithiocarbamates, xanthogenic acid Examples include salts. These vulcanization accelerators can be used alone or in combination of two or more. Among these vulcanization accelerators, TMTD, DPTT, CBS and the like are widely used.
加硫促進剤の割合は、固形分換算で、ゴム成分100質量部に対して、例えば0.1〜15質量部、好ましくは0.3〜10質量部、さらに好ましくは0.5〜5質量部程度であってもよい。 The ratio of the vulcanization accelerator is, for example, 0.1 to 15 parts by mass, preferably 0.3 to 10 parts by mass, and more preferably 0.5 to 5 parts by mass with respect to 100 parts by mass of the rubber component in terms of solid content. It may be about a part.
増強剤(カーボンブラック、シリカなど)の割合は、ゴム成分の総量100質量部に対して10〜100質量部(好ましくは20〜80質量部、さらに好ましくは30〜70質量部)程度であってもよい。また、軟化剤(ナフテン系オイルなどのオイル類)の割合は、ゴム成分の総量100質量部に対して、例えば1〜30質量部、好ましくは3〜20質量部(例えば5〜10質量部)程度であってもよい。また、加工剤又は加工助剤(ステアリン酸など)の割合は、ゴム成分100質量部に対して、10質量部以下(例えば、0〜10質量部)、好ましくは0.1〜5質量部、さらに好ましくは0.3〜3質量部(特に0.5〜2質量部)程度であってもよい。さらに、老化防止剤の割合は、ゴム成分の総量100質量部に対して、例えば0.5〜15質量部、好ましくは1〜10質量部、さらに好ましくは2.5〜7.5質量部(特に3〜7質量部)程度であってもよい。 The ratio of the enhancer (carbon black, silica, etc.) is about 10 to 100 parts by mass (preferably 20 to 80 parts by mass, more preferably 30 to 70 parts by mass) with respect to 100 parts by mass of the total amount of the rubber component. May be good. The ratio of the softener (oils such as naphthenic oil) is, for example, 1 to 30 parts by mass, preferably 3 to 20 parts by mass (for example, 5 to 10 parts by mass) with respect to 100 parts by mass of the total amount of rubber components. It may be about. The ratio of the processing agent or processing aid (such as stearic acid) is 10 parts by mass or less (for example, 0 to 10 parts by mass), preferably 0.1 to 5 parts by mass, with respect to 100 parts by mass of the rubber component. More preferably, it may be about 0.3 to 3 parts by mass (particularly 0.5 to 2 parts by mass). Further, the ratio of the anti-aging agent is, for example, 0.5 to 15 parts by mass, preferably 1 to 10 parts by mass, and more preferably 2.5 to 7.5 parts by mass with respect to 100 parts by mass of the total amount of the rubber component. In particular, it may be about 3 to 7 parts by mass).
[伸張ゴム層]
伸張ゴム層は、圧縮ゴム層で例示されたゴム成分を含む加硫ゴム組成物で形成されていてもよく、圧縮ゴム層と同様にグラフェン類及び短繊維が含まれていてもよい。さらに、伸張ゴム層は、グラフェン類を除いて圧縮ゴム層と同一の加硫ゴム組成物で形成された層であってもよい。
[Stretch rubber layer]
The stretched rubber layer may be formed of a vulcanized rubber composition containing the rubber component exemplified by the compressed rubber layer, and may contain graphenes and short fibers as in the compressed rubber layer. Further, the stretched rubber layer may be a layer formed of the same vulcanized rubber composition as the compressed rubber layer except for graphenes.
[接着ゴム層]
接着ゴム層を形成するためのゴム組成物は、圧縮ゴム層の加硫ゴム組成物と同様に、ゴム成分(クロロプレンゴムなど)、加硫剤又は架橋剤(酸化マグネシウム、酸化亜鉛などの金属酸化物、硫黄などの硫黄系加硫剤など)、共架橋剤又は架橋助剤(N,N’−m−フェニレンジマレイミドなどのマレイミド系架橋剤など)、加硫促進剤(TMTD、DPTT、CBSなど)、増強剤(カーボンブラック、シリカなど)、軟化剤(ナフテン系オイルなどのオイル類)、加工剤又は加工助剤(ステアリン酸、ステアリン酸金属塩、ワックス、パラフィンなど)、老化防止剤、接着性改善剤[レゾルシン−ホルムアルデヒド共縮合物、アミノ樹脂(窒素含有環状化合物とホルムアルデヒドとの縮合物、例えば、ヘキサメチロールメラミン、ヘキサアルコキシメチルメラミン(ヘキサメトキシメチルメラミン、ヘキサブトキシメチルメラミンなど)などのメラミン樹脂、メチロール尿素などの尿素樹脂、メチロールベンゾグアナミン樹脂などのベンゾグアナミン樹脂など)、これらの共縮合物(レゾルシン−メラミン−ホルムアルデヒド共縮合物など)など]、充填剤(クレー、炭酸カルシウム、タルク、マイカなど)、着色剤、粘着付与剤、可塑剤、カップリング剤(シランカップリング剤など)、安定剤(紫外線吸収剤、熱安定剤など)、難燃剤、帯電防止剤などを含んでいてもよい。なお、接着性改善剤において、レゾルシン−ホルムアルデヒド共縮合物及びアミノ樹脂は、レゾルシン及び/又はメラミンなどの窒素含有環状化合物とホルムアルデヒドとの初期縮合物(プレポリマー)であってもよい。
[Adhesive rubber layer]
The rubber composition for forming the adhesive rubber layer is a rubber component (chloroprene rubber, etc.), a vulcanizing agent, or a cross-linking agent (metal oxidation such as magnesium oxide, zinc oxide, etc.), similarly to the vulcanized rubber composition of the compressed rubber layer. Products, sulfur-based vulcanizing agents such as sulfur), co-crosslinking agents or cross-linking aids (maleimide-based cross-linking agents such as N, N'-m-phenylenedi maleimide), vulcanization accelerators (TMTD, DPTT, CBS) , Etc.), enhancers (carbon black, silica, etc.), softeners (oils such as naphthenic oils), processing agents or processing aids (stearic acid, metal stearate, wax, paraffin, etc.), antiaging agents, Adhesive improver [Resolsin-vulcanization cocondensate, amino resin (condensate of nitrogen-containing cyclic compound and formaldehyde, for example, hexamethylol melamine, hexaalkoxymethyl melamine (hexamethoxymethyl melamine, hexabutoxymethyl melamine, etc.), etc.) Melamine resin, urea resin such as methylol urea, benzoguanamine resin such as methylolbenzoguanamine resin, etc.), their cocondensates (resorcin-melamine-formaldehyde cocondensate, etc.)], fillers (clay, calcium carbonate, talc, mica, etc.) Etc.), colorants, tackifiers, plasticizers, coupling agents (silane coupling agents, etc.), stabilizers (ultraviolet absorbers, heat stabilizers, etc.), flame retardants, antistatic agents, etc. may be included. .. In the adhesiveness improving agent, the resorcin-formaldehyde cocondensate and the amino resin may be an initial condensate (prepolymer) of a nitrogen-containing cyclic compound such as resorcin and / or melamine and formaldehyde.
なお、このゴム組成物において、ゴム成分としては、前記圧縮ゴム層のゴム組成物のゴム成分と同系統(ジエン系ゴムなど)又は同種(クロロプレンゴムなど)のゴムを使用する場合が多い。また、加硫剤又は架橋剤、共架橋剤又は架橋助剤、加硫促進剤、増強剤、軟化剤及び老化防止剤の使用量は、それぞれ、前記圧縮ゴム層のゴム組成物と同様の範囲から選択できる。また、接着ゴム層のゴム組成物において、加工剤又は加工助剤(ステアリン酸など)の割合は、ゴム成分100質量部に対して0.1〜10質量部、好ましくは0.5〜5質量部、さらに好ましくは1〜3質量部程度であってもよい。また、接着性改善剤(レゾルシン−ホルムアルデヒド共縮合物、ヘキサメトキシメチルメラミンなど)の割合は、ゴム成分100質量部に対して0.1〜20質量部、好ましくは1〜10質量部、さらに好ましくは2〜8質量部程度であってもよい。さらに、グラフェン類は、前記圧縮ゴム層のゴム組成物と同様の割合で含んでいてもよく、含んでいなくてもよい。 In this rubber composition, as the rubber component, rubber of the same type (diene type rubber or the like) or the same type (chloroprene rubber or the like) as the rubber component of the rubber composition of the compressed rubber layer is often used. The amounts of the vulcanizing agent or cross-linking agent, co-cross-linking agent or cross-linking aid, vulcanization accelerator, enhancer, softener and anti-aging agent are in the same range as the rubber composition of the compressed rubber layer. You can choose from. Further, in the rubber composition of the adhesive rubber layer, the ratio of the processing agent or processing aid (stearic acid or the like) is 0.1 to 10 parts by mass, preferably 0.5 to 5 parts by mass with respect to 100 parts by mass of the rubber component. It may be about 1 to 3 parts by mass, more preferably 1 to 3 parts by mass. The ratio of the adhesiveness improving agent (resorcin-formaldehyde copolymer, hexamethoxymethylmelamine, etc.) is 0.1 to 20 parts by mass, preferably 1 to 10 parts by mass, more preferably 1 part by mass, based on 100 parts by mass of the rubber component. May be about 2 to 8 parts by mass. Further, graphenes may or may not be contained in the same proportion as the rubber composition of the compressed rubber layer.
[芯体]
芯体としては、特に限定されないが、通常、ベルト幅方向に所定間隔で配列した心線(撚りコード)を使用できる。心線は、ベルトの長手方向に延びて配設され、通常、ベルトの長手方向に平行に所定のピッチで並列的に延びて配設されている。心線は、少なくともその一部が接着ゴム層と接していればよく、接着ゴム層が心線を埋設する形態、接着ゴム層と伸張ゴム層との間に心線を埋設する形態、接着ゴム層と圧縮ゴム層との間に心線を埋設する形態のいずれの形態であってもよい。これらのうち、耐久性を向上できる点から、接着ゴム層が心線を埋設する形態が好ましい。
[Core body]
The core body is not particularly limited, but usually, core wires (twisted cords) arranged at predetermined intervals in the belt width direction can be used. The core wires are arranged so as to extend in the longitudinal direction of the belt, and are usually arranged so as to extend in parallel at a predetermined pitch parallel to the longitudinal direction of the belt. The core wire may be at least partially in contact with the adhesive rubber layer, and the adhesive rubber layer has a form in which the core wire is embedded, a form in which the core wire is embedded between the adhesive rubber layer and the stretch rubber layer, and an adhesive rubber. It may be in any form in which the core wire is embedded between the layer and the compressed rubber layer. Of these, a form in which the adhesive rubber layer embeds the core wire is preferable from the viewpoint of improving durability.
心線を構成する繊維としては、前記短繊維と同様の繊維が例示できる。前記繊維のうち、高モジュラスの点から、エチレンテレフタレート、エチレン−2,6−ナフタレートなどのC2−4アルキレンC6−14アリレートを主たる構成単位とするポリエステル繊維(ポリアルキレンアリレート系繊維)、ポリアミド繊維(アラミド繊維など)などの合成繊維、炭素繊維などの無機繊維などが汎用され、ポリエステル繊維(ポリエチレンテレフタレート系繊維、ポリエチレンナフタレート系繊維)、ポリアミド繊維が好ましい。繊維はマルチフィラメント糸であってもよい。マルチフィラメント糸の繊度は、例えば2000〜10000デニール(特に4000〜8000デニール)程度であってもよい。マルチフィラメント糸は、例えば100〜5,000本であってもよく、好ましくは500〜4,000本、さらに好ましくは1,000〜3,000本程度のモノフィラメント糸を含んでいてもよい。 Examples of the fibers constituting the core wire include fibers similar to the short fibers. Among the fibers, from the viewpoint of high modulus, polyester fibers ethylene terephthalate, a C 2-4 alkylene C 6-14 arylate such as ethylene-2,6-naphthalate as a main constituent unit (polyalkylene arylate-series fiber), a polyamide Synthetic fibers such as fibers (aramid fibers and the like), inorganic fibers such as carbon fibers and the like are widely used, and polyester fibers (polyester terephthalate fiber, polyethylene naphthalate fiber) and polyamide fiber are preferable. The fiber may be a multifilament yarn. The fineness of the multifilament yarn may be, for example, about 2000 to 10000 denier (particularly 4000 to 8000 denier). The multifilament yarn may be, for example, 100 to 5,000 yarns, preferably 500 to 4,000 yarns, and more preferably 1,000 to 3,000 yarns.
心線としては、通常、マルチフィラメント糸を使用した撚りコード(例えば、諸撚り、片撚り、ラング撚りなど)を使用できる。心線の平均線径(撚りコードの繊維径)は、例えば0.5〜3mmであってもよく、好ましくは0.6〜2mm、さらに好ましくは0.7〜1.5mm程度であってもよい。 As the core wire, a twisted cord using a multifilament yarn (for example, various twists, single twist, rung twist, etc.) can be usually used. The average wire diameter of the core wire (fiber diameter of the twisted cord) may be, for example, 0.5 to 3 mm, preferably 0.6 to 2 mm, and more preferably about 0.7 to 1.5 mm. Good.
心線は、ゴム成分との接着性を改善するため、短繊維と同様の方法で接着処理(又は表面処理)されていてもよい。心線も短繊維と同様に、少なくともRFL液で接着処理するのが好ましい。 The core wire may be adhered (or surface-treated) in the same manner as the short fiber in order to improve the adhesiveness with the rubber component. Like the short fibers, the core wire is preferably bonded with at least an RFL solution.
[補強布]
摩擦伝動ベルトにおいて、補強布を使用する場合、圧縮ゴム層の表面に補強布を積層する形態に限定されず、例えば、伸張ゴム層の表面(接着ゴム層と反対側の面)に補強布を積層してもよく、圧縮ゴム層及び/又は伸張ゴム層に補強層を埋設する形態(例えば、特開2010−230146号公報に記載の形態など)であってもよい。補強布は、例えば、織布、広角度帆布、編布、不織布などの布材(好ましくは織布)などで形成でき、必要であれば、前記接着処理、例えば、RFL液で処理(浸漬処理など)したり、接着ゴムを前記布材にすり込むフリクションや、前記接着ゴムと前記布材とを積層した後、圧縮ゴム層及び/又は伸張ゴム層の表面に積層してもよい。
[Reinforcing cloth]
When a reinforcing cloth is used in the friction transmission belt, it is not limited to the form in which the reinforcing cloth is laminated on the surface of the compressed rubber layer. For example, the reinforcing cloth is applied to the surface of the stretch rubber layer (the surface opposite to the adhesive rubber layer). It may be laminated, or may be in the form of embedding a reinforcing layer in the compressed rubber layer and / or the stretched rubber layer (for example, the form described in Japanese Patent Application Laid-Open No. 2010-230146). The reinforcing cloth can be formed of, for example, a woven cloth, a wide-angle sail cloth, a knitted cloth, a cloth material such as a non-woven fabric (preferably a woven cloth), and if necessary, the adhesive treatment, for example, a treatment with an RFL liquid (immersion treatment). Etc.), friction by rubbing the adhesive rubber into the cloth material, or laminating the adhesive rubber and the cloth material, and then laminating on the surface of the compressed rubber layer and / or the stretched rubber layer.
[摩擦伝動ベルトの製造方法]
本発明の摩擦伝動ベルトの製造方法は、特に限定されず、各層の積層工程(ベルトスリーブの製造方法)に関しては、慣用の方法を利用できる。
[Manufacturing method of friction transmission belt]
The method for manufacturing the friction transmission belt of the present invention is not particularly limited, and a conventional method can be used for the laminating step of each layer (method for manufacturing the belt sleeve).
例えば、コグドVべルトの場合、補強布(下布)と圧縮ゴム層用シート(未加硫ゴム)からなる積層体を、前記補強布を下にして歯部と溝部とを交互に配した平坦なコグ付き型に設置し、温度60〜100℃(特に70〜80℃)程度でプレス加圧することによってコグ部を型付けしたコグパッド(完全には加硫しておらず、半加硫状態にあるパッド)を作製した後、このコグパッドの両端をコグ山部の頂部から垂直に切断してもよい。さらに、円筒状の金型に歯部と溝部とを交互に配した内母型を被せ、この歯部と溝部に係合させてコグパッドを巻き付けてコグ山部の頂部でジョイントし、この巻き付けたコグパッドの上に第1の接着ゴム層用シート(下接着ゴム:未加硫ゴム)を積層した後、芯体を螺旋状にスピニングし、この上に第2の接着ゴム層用シート(上接着ゴム:前記接着ゴム層用シートと同じ)、伸張ゴム層用シート(未加硫ゴム)、補強布(上布)を順次巻き付けて成形体を作製してもよい。その後、ジャケットを被せて金型を加硫缶に設置し、温度120〜200℃(特に150〜180℃)程度で加硫してベルトスリーブを調製した後、カッターなどを用いて、V状に切断加工してもよい。 For example, in the case of Cogged V-belt, a laminated body composed of a reinforcing cloth (lower cloth) and a sheet for a compressed rubber layer (unvulcanized rubber) is alternately arranged with teeth and grooves with the reinforcing cloth facing down. A cog pad (not completely vulcanized, semi-vulcanized) in which the cog part is molded by pressing and pressing at a temperature of about 60 to 100 ° C (especially 70 to 80 ° C) by installing it in a flat mold with a cog. After making a certain pad), both ends of the cog pad may be cut vertically from the top of the cog ridge. Further, a cylindrical mold is covered with an inner mother mold in which teeth and grooves are alternately arranged, and the cog pad is wound by engaging the teeth and the groove and jointed at the top of the cog ridge, and this winding is performed. After laminating the first adhesive rubber layer sheet (lower adhesive rubber: unvulcanized rubber) on the cog pad, the core body is spun spirally, and the second adhesive rubber layer sheet (upper adhesive) is spun on this. Rubber: The same as the adhesive rubber layer sheet), the stretch rubber layer sheet (unvulcanized rubber), and the reinforcing cloth (upper cloth) may be wound in sequence to prepare a molded body. After that, a jacket is put on and the mold is placed in a vulcanizing can, vulcanized at a temperature of about 120 to 200 ° C. (particularly 150 to 180 ° C.) to prepare a belt sleeve, and then made into a V shape using a cutter or the like. It may be cut.
以下に、実施例に基づいて本発明をより詳細に説明するが、本発明はこれらの実施例によって限定されるものではない。以下の例において、実施例に用いた原料、各物性における測定方法又は評価方法を以下に示す。なお、特にことわりのない限り、「部」及び「%」は質量基準である。 Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples. In the following examples, the raw materials used in the examples, the measurement method or the evaluation method for each physical property are shown below. Unless otherwise specified, "parts" and "%" are based on mass.
[原料]
クロロプレンゴム:デンカ(株)製「デンカクロロプレンDCR」
アラミド短繊維:帝人テクノプロダクツ(株)製「コーネックス短繊維」、平均繊維長3mm、平均繊維径14μm
ビニルピリジン−スチレン−ブタジエン共重合体ラテックス:日本ゼオン(株)製
グラフェン:グラフェンプラットフォーム(株)製「GNH−X1」
グラファイト:オリエンタル産業(株)製「AT−20」
超高分子量ポリエチレン(UHMW−PE):Ticona Engineering Polymers社製「GUR−4150」
未焼成低分子量PTFE:(株)喜多村製「KTL−8F」
可塑剤:DIC(株)製、セバケート系オイル
カーボンブラック:東海カーボン(株)製「シースト3」
シリカ:東ソー・シリカ(株)製「Nipsil VN3」
老化防止剤:精工化学(株)製「ノンフレックスOD3」
心線:1,000デニールのPET繊維を2×3の撚り構成で、上撚り係数3.0、下撚り係数3.0で諸撚りしたトータルデニール6,000のコードを接着処理した撚りコード。
[material]
Chloroprene rubber: "Denka Chloroprene DCR" manufactured by Denka Co., Ltd.
Aramid short fiber: "Conex short fiber" manufactured by Teijin Techno Products Co., Ltd.,
Vinyl Pyridine-Styrene-butadiene Copolymer Latex: Made by Zeon Corporation Graphene: Made by Graphene Platform Co., Ltd. "GNH-X1"
Graphite: "AT-20" manufactured by Oriental Sangyo Co., Ltd.
Ultra High Molecular Weight Polyethylene (UHMW-PE): "GUR-4150" manufactured by Ticona Engineering Polymers
Unfired low molecular weight PTFE: "KTL-8F" manufactured by Kitamura Co., Ltd.
Plasticizer: DIC Corporation, Sebacate oil Carbon black: Tokai Carbon Co., Ltd. "
Silica: "Nipsil VN3" manufactured by Tosoh Silica Co., Ltd.
Anti-aging agent: "Non-flex OD3" manufactured by Seiko Chemical Co., Ltd.
Core wire: A twisted cord in which 1,000 denier PET fibers are twisted in a 2 x 3 twisted structure with a total denier 6,000 cord twisted with an upper twist coefficient of 3.0 and a lower twist coefficient of 3.0.
[摩擦係数及び摩耗量]
実施例及び比較例の圧縮ゴム層用ゴム組成物を153℃で30分間加硫して、幅10mm、長さ20mm、厚さ4mmの試験片を作製した。下部ベース台に取り付けた相手材を上部に取り付けた試験片に一定の面圧で押し付け、さらに上部に取り付けた試験片を一定の速度で往復運動させることができる摺動式摩擦摩耗試験機((株)米倉製作所製)にセットし、速度10m/分、面圧0.5MPa、温度70℃、走行時間20時間の条件で試験を行った。相手材の材質はSUS304とした。摩擦係数は、ロードセルの電圧を10秒ごとにサンプリングし、試験時間20時間の平均値を算出した。摩耗量は試験前後における試験片の重量減少量を測定した。
[Friction coefficient and wear amount]
The rubber compositions for the compressed rubber layer of Examples and Comparative Examples were vulcanized at 153 ° C. for 30 minutes to prepare test pieces having a width of 10 mm, a length of 20 mm, and a thickness of 4 mm. A sliding friction and wear tester that can reciprocate the test piece attached to the upper part at a constant speed by pressing the mating material attached to the lower base base against the test piece attached to the upper part with a constant surface pressure. The test was carried out under the conditions of a speed of 10 m / min, a surface pressure of 0.5 MPa, a temperature of 70 ° C., and a running time of 20 hours. The material of the mating material was SUS304. For the friction coefficient, the voltage of the load cell was sampled every 10 seconds, and the average value for a test time of 20 hours was calculated. The amount of wear was measured by measuring the amount of weight loss of the test piece before and after the test.
[耐久走行試験(耐側圧性)]
耐久走行試験は、図3に示すように、直径50mmの駆動(Dr.)プーリ12と、直径125mmの従動(Dn.)プーリ13とからなる2軸走行試験機を用いて行なった。各プーリ12,13にローエッジコグドVベルト11を掛架し、駆動プーリ12の回転数5000rpm、従動プーリ13に10N・mの負荷を付与し、雰囲気温度80℃にてベルト11を最大40時間走行させた。走行中のベルト表面温度は最大120℃に達した。走行後のローエッジコグドVベルト11のコグ部の側面を目視で観察し、コグ部100個当たりのクラック発生割合(短繊維を起点とするクラックが発生したコグ部の個数割合)を算出し、以下の基準で評価した。
[Durable running test (side pressure resistance)]
As shown in FIG. 3, the endurance running test was carried out using a two-axis running tester including a driving (Dr.)
◎:クラック発生が0%
○:クラック発生が0%超〜10%未満
×:クラック発生が10%以上。
⊚: Crack occurrence is 0%
◯: Crack occurrence is more than 0% and less than 10% ×: Crack occurrence is 10% or more.
実施例1〜10及び比較例1〜5
(ゴム層の形成)
表1(接着ゴム層)及び表2(圧縮ゴム層及び伸張ゴム層)のゴム組成物は、それぞれ、バンバリーミキサーなどの公知の方法を用いてゴム練りを行い、この練りゴムをカレンダーロールに通して圧延ゴムシート(接着ゴム層用シート、圧縮ゴム層用シート、伸張ゴム層用シート)を作製した。なお、短繊維は、RFL液(レゾルシン及びホルムアルデヒドと、ラテックスとしてのビニルピリジン−スチレン−ブタジエンゴムラテックスとを含有)で接着処理し、固形分の付着率6質量%の短繊維を用いた。RFL液として、レゾルシン2.6質量部、37%ホルマリン1.4質量部、ビニルピリジン−スチレン−ブタジエン共重合体ラテックス17.2質量部、水78.8質量部を用いた。
Examples 1-10 and Comparative Examples 1-5
(Formation of rubber layer)
The rubber compositions of Table 1 (adhesive rubber layer) and Table 2 (compressed rubber layer and stretched rubber layer) are each rubber-kneaded using a known method such as a Banbury mixer, and the kneaded rubber is passed through a calendar roll. A rolled rubber sheet (sheet for adhesive rubber layer, sheet for compressed rubber layer, sheet for stretch rubber layer) was prepared. The short fibers were bonded with an RFL solution (containing resorcin and formaldehyde and vinylpyridine-styrene-butadiene rubber latex as latex), and short fibers having a solid content of 6% by mass were used. As the RFL solution, 2.6 parts by mass of resorcin, 1.4 parts by mass of 37% formalin, 17.2 parts by mass of vinylpyridine-styrene-butadiene copolymer latex, and 78.8 parts by mass of water were used.
(摩擦伝動ベルトの製造)
下布となる補強布と、圧縮ゴム層用シート(未加硫ゴム)との積層体を、補強布を下にして歯部と溝部とを交互に配した平坦なコグ付き型に設置し、75℃でプレス加圧することによってコグ部を型付けしたコグパッド(完全には加硫しておらず、半加硫状態にある)を作製した。次に、このコグパッドの両端をコグ山部の頂部から垂直に切断した。
(Manufacturing of friction transmission belt)
A laminate of a reinforcing cloth to be a lower cloth and a sheet for a compressed rubber layer (unvulcanized rubber) is installed in a flat cogged mold in which teeth and grooves are alternately arranged with the reinforcing cloth facing down. A cog pad (not completely vulcanized and in a semi-vulcanized state) having a cog portion molded by pressing and pressing at 75 ° C. was produced. Next, both ends of the cog pad were cut vertically from the top of the cog ridge.
円筒状の金型に歯部と溝部とを交互に配した内母型を被せ、この歯部と溝部に係合させて前記コグパッドを巻き付けてコグ山部の頂部でジョイントし、この巻き付けたコグパッドの上に接着ゴム層用シート(下接着ゴム:未加硫ゴム)を積層した後、心線を螺旋状にスピニングし、この上に接着ゴム層用シート(上接着ゴム:前記接着ゴム層用シートと同じ)、伸張ゴム層用シート(未加硫ゴム)、上布となる補強布(上布)を順次巻き付けて成形体を作製した。その後、ジャケットを被せて金型を加硫缶に設置し、温度160℃、時間20分で加硫してベルトスリーブを得た。このスリーブをカッターでベルト長手方向に所定幅でV状断面形状に切断し、さらにベルト両側面を研磨し、図1に示す構造のベルト、すなわちベルト内周側にコグを有した変速ベルトであるローエッジコグドVベルト(サイズ:上幅22.0mm、厚み11.0mm、外周長800mm)を作製した。 A cylindrical mold is covered with an inner mother mold in which teeth and grooves are alternately arranged, and the cog pad is wound by engaging with the teeth and the groove and joined at the top of the cog ridge, and the wrapped cog pad is used. After laminating the adhesive rubber layer sheet (lower adhesive rubber: unvulcanized rubber) on top of it, the core wire is spun in a spiral shape, and the adhesive rubber layer sheet (upper adhesive rubber: for the adhesive rubber layer) is placed on top of this. A molded product was prepared by sequentially winding a stretch rubber layer sheet (unvulcanized rubber) and a reinforcing cloth (upper cloth) as an upper cloth (same as the sheet). Then, a jacket was put on and the mold was placed in a vulcanization can, and vulcanization was performed at a temperature of 160 ° C. for 20 minutes to obtain a belt sleeve. This sleeve is cut into a V-shaped cross-sectional shape with a predetermined width in the longitudinal direction of the belt with a cutter, and both side surfaces of the belt are polished to form a belt having the structure shown in FIG. 1, that is, a speed change belt having a cog on the inner peripheral side of the belt. A low-edge cogged V-belt (size: upper width 22.0 mm, thickness 11.0 mm, outer circumference length 800 mm) was produced.
圧縮ゴム層用ゴム組成物の摩擦係数及び摩耗量の測定結果を表2に示し、得られた摩擦伝動ベルトの耐久走行試験の結果も表2に示す。 Table 2 shows the measurement results of the friction coefficient and the amount of wear of the rubber composition for the compressed rubber layer, and Table 2 also shows the results of the durability running test of the obtained friction transmission belt.
グラフェン及び固体潤滑剤を含まない比較例1では摩擦係数が高く、耐久走行試験においてクラックが多く発生した。摩擦係数が高いためにプーリからの抜けが悪く、逆曲げされる形となり、発熱が大きくなり、その熱によりゴムが硬化劣化したためと考えられる。 In Comparative Example 1 containing no graphene and solid lubricant, the coefficient of friction was high and many cracks were generated in the durability running test. It is probable that the rubber was hardened and deteriorated due to the heat generated by the rubber being bent in the reverse direction due to the high coefficient of friction.
グラフェンを含む実施例1〜3では、摩擦係数が十分に低下しており、摩耗量も少なかった。また、耐久走行試験においてクラックは発生しなかった。特に実施例1や2のように少量の添加で大きな効果が得られることから、ゴムの加工性や物性に大きな影響を与えることなく、またクラックの起点となる可能性も抑えることができると考えられる。 In Examples 1 to 3 containing graphene, the coefficient of friction was sufficiently reduced and the amount of wear was also small. In addition, no cracks occurred in the endurance running test. In particular, since a large effect can be obtained by adding a small amount as in Examples 1 and 2, it is considered that the possibility of becoming a crack starting point can be suppressed without significantly affecting the workability and physical properties of rubber. Be done.
グラフェンを10質量部配合した実施例4では、摩擦係数が大きく低下し、摩耗量も最も少なかった。しかし、耐久走行試験において少量ながらクラックが発生し、摩擦係数が適正値以上に低下することでスリップが発生し、ゴムが熱劣化したものと考えられる。 In Example 4 in which 10 parts by mass of graphene was blended, the coefficient of friction was significantly reduced and the amount of wear was also the smallest. However, it is probable that in the endurance running test, cracks were generated in a small amount, and the friction coefficient was lowered to an appropriate value or more, so that slip was generated and the rubber was thermally deteriorated.
比較例2及び3は、固体潤滑剤としてグラファイトを用いたベルトであるが、少量の添加では摩擦係数低下の効果がほとんど発現せず、また、多く配合した場合でもグラフェンを配合した場合のような摩擦係数の十分な低下は見られず、クラックが発生した。グラファイトはグラフェンが何層も重なった構造となっているために内部の層は何ら効果を発揮できず、同じ重量を添加しても、グラフェンよりも効果が得られにくいと考えられる。比較例4は超高分子量ポリエチレンを配合したベルトであるが、グラファイト同様に十分な摩擦係数低減効果は見られなかった。比較例5は、グラファイトに超高分子量ポリエチレンを併用したベルトであるが、同様に十分な摩擦係数低減効果は見られなかった。 Comparative Examples 2 and 3 are belts using graphite as a solid lubricant, but the effect of lowering the coefficient of friction is hardly exhibited by adding a small amount, and even when a large amount is added, graphene is added. No sufficient decrease in the coefficient of friction was observed, and cracks occurred. Since graphite has a structure in which graphene is layered, the inner layer cannot exert any effect, and it is considered that even if the same weight is added, the effect is less likely to be obtained than graphene. Comparative Example 4 is a belt containing ultra-high molecular weight polyethylene, but a sufficient friction coefficient reducing effect was not observed as in graphite. Comparative Example 5 is a belt in which ultra-high molecular weight polyethylene is used in combination with graphite, but similarly, a sufficient effect of reducing the coefficient of friction was not observed.
実施例5は、グラフェンにグラファイトを併用、実施例6はグラフェンに超高分子量ポリエチレンを併用、実施例7は未焼成低分子量PTFEを併用、実施例8はグラフェン、超高分子量ポリエチレン、未焼成低分子量PTFEの三種を配合したベルトであるが、互いに阻害することもなく、グラフェンを単独で用いた場合よりもさらに摩擦係数を低減することができた。このように、固体潤滑剤の混合比率を種々変更することで、狙いの摩擦係数を得ることも可能である。 Example 5 uses graphene in combination with graphite, Example 6 uses graphene in combination with ultra-high molecular weight polyethylene, Example 7 uses unfired low molecular weight PTFE in combination, and Example 8 uses graphene, ultra high molecular weight polyethylene, and unfired low. Although the belt contains three types of molecular weight PTFE, it does not interfere with each other, and the coefficient of friction can be further reduced as compared with the case where graphene is used alone. In this way, it is possible to obtain the target friction coefficient by variously changing the mixing ratio of the solid lubricant.
実施例9は、短繊維を含まず、クロロプレンゴム100質量部に対して、グラフェンを1質量部含むベルトである。グラフェン及び短繊維の両方を含む実施例1と比較すると、摩擦係数は少し大きかったが、耐久走行試験においてクラックは発生しなかった。 Example 9 is a belt that does not contain short fibers and contains 1 part by mass of graphene with respect to 100 parts by mass of chloroprene rubber. Compared with Example 1 containing both graphene and short fibers, the coefficient of friction was slightly higher, but no cracks occurred in the endurance running test.
実施例10は、クロロプレンゴム100質量部に対して、短繊維40質量部と、グラフェン1質量部とを含むベルトである。短繊維15質量部を含む実施例1と比較すると、摩擦係数が小さく、摩耗量も少なくなっていたが、耐久走行試験において少量のクラックが発生した。このことは、短繊維の添加量が多くなることで耐屈曲疲労性が低下したためと考えられる。 Example 10 is a belt containing 40 parts by mass of short fibers and 1 part by mass of graphene with respect to 100 parts by mass of chloroprene rubber. Compared with Example 1 containing 15 parts by mass of short fibers, the friction coefficient was small and the amount of wear was also small, but a small amount of cracks occurred in the durability running test. It is considered that this is because the bending fatigue resistance decreased as the amount of short fibers added increased.
実施例1及び9〜10の結果から、グラフェンの添加により、短繊維の割合が少量又は短繊維を含まなくても高い耐摩耗性、耐側圧性及び摺動性が発現するため、耐久性を向上でき、前記特性をバランスよく向上できることが分かった。 From the results of Examples 1 and 9 to 10, high wear resistance, lateral pressure resistance and slidability are exhibited by adding graphene even if the proportion of short fibers is small or the short fibers are not contained. It was found that the characteristics could be improved and the characteristics could be improved in a well-balanced manner.
本発明の摩擦伝動ベルトは、例えば、Vベルト(ラップドVベルト、ローエッジVベルト、ローエッジコグドVベルト)、Vリブドベルト、平ベルトなどに適用できる。特に、ベルト走行中に変速比が無段階で変わる変速機(無段変速装置)に使用されるVベルト(変速ベルト)、例えば、自動二輪車やATV(四輪バギー)、スノーモービルなどの無段変速装置に使用されるローエッジコグドVベルト、ローエッジダブルコグドVベルトに適用するのが好ましい。 The friction transmission belt of the present invention can be applied to, for example, a V belt (wrapped V belt, low edge V belt, low edge cogged V belt), V ribbed belt, flat belt and the like. In particular, V-belts (transmission belts) used in transmissions (continuously variable transmissions) whose gear ratio changes steplessly while the belt is running, for example, stepless motorcycles, ATVs (four-wheel buggies), snowmobiles, etc. It is preferably applied to low-edge cogged V-belts and low-edge double-cogged V-belts used in transmissions.
1…摩擦伝動ベルト
2,6…補強布
3…伸張ゴム層
4…接着ゴム層
4a…芯体
5…圧縮ゴム層
1 ...
Claims (7)
前記ゴム成分がクロロプレンゴムであり、
前記グラフェン類の割合が前記ゴム成分100質量部に対して0.1〜10質量部であり、
前記圧縮ゴム層が短繊維をさらに含み、前記短繊維の割合が前記ゴム成分100質量部に対して12〜40質量部であり、
Vベルトである摩擦伝動ベルト。 A friction transmission belt including a compression rubber layer having a friction transmission surface at least partially in contact with a pulley, and the friction transmission surface of the compression rubber layer is vulcanization of a rubber composition containing a rubber component and graphenes. Formed of things ,
The rubber component is chloroprene rubber,
The ratio of the graphenes is 0.1 to 10 parts by mass with respect to 100 parts by mass of the rubber component.
The compressed rubber layer further contains short fibers, and the ratio of the short fibers is 12 to 40 parts by mass with respect to 100 parts by mass of the rubber component.
Friction transmission belt that is a V-belt .
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