JP2008185162A - Friction transmission belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a friction transmission belt formed of a rubber composition for sustaining its wettability with water while producing high transmitting torque even in a high slipping condition when getting wet with poured water. <P>SOLUTION: A V-ribbed belt 1 comprises an elastic material layer including a rubber layer in which core wires 2 are embedded in the longitudinal direction of the belt. Herein, a ribbed portion 6 as a friction transmitting face is formed of a rubber composition which incorporates 1-25 pts.wt. surface active agent relative to 100 pts.wt. ethylene-α-olefin elastomer. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a friction transmission belt such as a V-ribbed belt and a V-belt.

  Conventionally, rubbers such as natural rubber, styrene / butadiene rubber, and chloroprene rubber have been generally used as power transmission belts used in automobile engines and the like. However, in recent years, with the social demand for energy saving and downsizing, parts in the engine room of automobiles tend to be densely arranged, and as a result, the ambient temperature in the engine room is higher than in the past. It is rising.

  It has been pointed out that the rubber constituting the power transmission belt is cured under such a high temperature atmosphere and cracks occur early. In addition, as the energy is saved, the rotational fluctuation of the engine increases, and the influence thereof causes an increase in the tension fluctuation of the power transmission belt, causing problems such as early wear and sound generation. Furthermore, since a rubber containing halogen such as chloroprene leads to generation of dioxins, a belt made of a rubber not containing halogen, which is an environmental load substance, has recently been demanded.

Recently, ethylene / α-olefin rubbers such as ethylene / propylene rubber (EPM) or ethylene / propylene / diene copolymer rubber (EPDM) have excellent heat resistance. At the same time, it is a relatively inexpensive polymer and is expected to be promising because it satisfies the requirement of dehalogenation. Specifically, a power transmission belt using an ethylene / α-olefin elastomer reinforced with a metal salt of an α-β-unsaturated organic acid has been proposed (for example, see Patent Document 1).
Japanese National Patent Publication No. 9-500930

  However, since the ethylene / α-olefin elastomer has poor wettability with water compared to chloroprene rubber and easily repels water, the infiltration state of water between the belt and the pulley is not uniform when wet. And, in a place where water does not enter, the friction coefficient does not decrease and the belt is in close contact with the pulley, but in a part where water enters, the friction coefficient partially decreases and the belt and pulley There is a problem that stick-slip noise is likely to occur because slip occurs between the two.

  On the other hand, since the friction coefficient of the belt surface is high, it has been pointed out that abnormal noise is generated even during normal running. On the other hand, it was required to keep the friction coefficient low to some extent. However, for example, when a large amount of lubricant was added to lower the friction coefficient, there was a problem that adhesive wear occurred.

  An object of the present invention is to provide a friction transmission belt in which wettability with water is continuously maintained, and a high transmission torque can be obtained even in a high slip state at the time of water injection.

  The invention according to claim 1 of the present application resides in a friction transmission belt comprising a rubber composition in which at least a friction transmission surface is blended with 1 to 25 parts by weight of a surfactant with respect to 100 parts by weight of an ethylene / α-olefin elastomer. By adding a surfactant, it is possible to modify the friction transmission surface and improve the affinity with water. That is, the surfactant improves the hydrophilicity of the friction transmission surface, and as a result, noise due to rubbing such as misalignment is reduced.

  Invention of Claim 2 of this application is a friction transmission belt whose viscosity of surfactant is 20-200 (mPa * s / 25 degreeC), and when the said viscosity is less than 20, it becomes impossible to satisfy the heat resistance of a belt. If it exceeds 200, the friction transmission surface is not sufficiently improved by the surfactant.

  The invention described in claim 3 is a friction transmission belt in which 3 to 20 parts by weight of a paraffinic petroleum softening agent is blended with 100 parts by weight of an ethylene / α-olefin elastomer, thereby reducing the amount of the surfactant added. can do.

  In the invention according to claim 4 of the present application, the friction transmission belt is a V-ribbed belt, and it is possible to suppress a rubbing sound with a metal pulley and further a slip sound at the time of being wet.

  In the friction transmission belt according to the claims of the present application, the surfactant improves the hydrophilicity of the friction transmission surface, maintains the wettability with water continuously, and has a high transmission torque even in a high slip state during water injection. Can be obtained.

  Embodiments of the present invention will be described. In the present embodiment, the present invention is applied to a V-ribbed belt having a plurality of rib portions extending in the longitudinal direction of the belt as a friction transmission belt.

  As shown in FIG. 1, the V-ribbed belt 1 includes an adhesive layer 3 in which a core wire 2 is embedded in the longitudinal direction of the belt, a compression layer 4 provided on one surface of the adhesive layer 3, and the other of the adhesive layer 3. And a stretch layer 5 made of a cover canvas covering the surface of the cover. The compressed layer 4 is provided with a plurality of rib portions 6 having a substantially triangular cross section extending in the belt longitudinal direction. Here, the friction transmission surface refers to the surface layer of the compression layer 4.

  The core wire 2 used in the present invention includes polyethylene terephthalate (PET) fiber, polyethylene naphthalate (PEN) fiber, polytrimethylene terephthalate (PTT) fiber, polybutylene terephthalate (PBT) fiber, polyparaphenylene benzobisoxazole (PBO). ) Twisted cords composed of fibers, polyamide fibers, glass fibers, aramid fibers, or the like can be used.

  The core wire is preferably subjected to an adhesive treatment. For example, (1) After impregnating the untreated cord into a tank containing a treatment liquid selected from an epoxy compound and an isocyanate compound, and pre-dip (2) 160 Dry in a drying oven set at a temperature of ~ 200 ° C for 30-600 seconds, (3) then immerse in a tank containing an adhesive solution consisting of RFL, and (4) set the temperature at 210-260 ° C The stretched heat fixing processor can be stretched by −1 to 3% for 30 to 600 seconds to form a stretched cord.

  The RFL treatment liquid is a mixture of resorcin and formaldehyde precondensate with rubber latex. In this case, the molar ratio of resorcin and formaldehyde is preferably 1: 2 to 2: 1 in order to increase the adhesive force. . If the molar ratio is less than 1/2, the three-dimensional reaction of resorcin-formaldehyde resin progresses too much and gels. On the other hand, if it exceeds 2/1, the reaction between resorcin and formaldehyde does not progress so much. To do.

  The canvas constituting the stretch layer 5 is a fiber base selected from woven fabric, knitted fabric, non-woven fabric, and the like. Examples of the constituent fiber materials include natural fibers such as cotton and hemp, inorganic fibers such as metal fibers and glass fibers, and polyamides, polyesters, polyethylenes, polyurethanes, polystyrenes, polyfluoroethylenes, polyacryls, polyvinyl alcohols, and aromatics. Organic fibers such as Aripolyester and Aramid. In the case of a woven fabric, these yarns are woven by plain weaving, twill weaving, satin weaving or the like.

  The canvas is preferably immersed in the RFL liquid according to a known technique. In addition, after being immersed in the RFL solution, it is possible to perform an immersion treatment in friction in which unvulcanized rubber is rubbed into a canvas or in a soaking solution in which rubber is dissolved in a solvent. The RFL solution may be mixed with a carbon black solution as appropriate to blacken the treatment, and a known surfactant may be added in an amount of 0.1 to 5.0% by mass.

  The adhesive layer 3 is desirably made of a blend rubber obtained by mixing ethylene / α-olefin rubber alone or a partner rubber made of other kinds of rubber as a rubber component. As the other rubber blended with ethylene / α-olefin rubber, butadiene rubber (BR), styrene / butadiene rubber (SBR), nitrile rubber (NBR), hydrogenated nitrile rubber (H-NBR), chloroprene rubber (CR), Mention may be made of at least one rubber of butyl rubber (IIR) and natural rubber (NR). Of course, it is also possible to use the same rubber composition as described above.

  Here, a rubber composition which is a feature of the present invention is used for the compression layer 4. As this rubber composition, 5 to 25 parts by weight, preferably 10 to 25 parts by weight of an ether ester plasticizer is blended with 100 parts by weight of the ethylene / α-olefin elastomer. If the added amount of the plasticizer is less than 5 parts by weight, it is insufficient as an amount to cover the belt surface, so it is difficult to ensure uniform water wettability, and the effect as a lubricant is poor. . On the other hand, when the blending amount exceeds 25 parts by weight, there is a disadvantage that the surface friction coefficient is remarkably lowered and the wear resistance is extremely lowered.

  Examples of the ethylene / α-olefin elastomer include a copolymer of ethylene and α-olefin (propylene, butene, hexene, or octene), a copolymer of ethylene, the α-olefin, and a nonconjugated diene, and the like. Examples of the diene component include non-conjugated dienes having 5 to 15 carbon atoms such as ethylidene norbornene, dicyclopentadiene, 1,4-hexadiene, cyclooctadiene, and methylene norbornene. Specifically, it refers to rubber such as EPM and EPDM.

  In the present invention, a nonionic surfactant is used as the surfactant. Nonionic surfactants include polyethylene glycol type nonionic surfactants and polyhydric alcohol type nonionic surfactants.

  The polyethylene glycol type nonionic surfactant is a nonionic surfactant obtained by adding ethylene oxide as a hydrophilic group to a hydrophobic group raw material such as alkylphenol and higher fatty acid. Examples of the polyethylene glycol type nonionic surfactant include polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene polyoxypropylene alkyl ether, glyceride ethylene oxide adduct and other higher alcohol ethylene oxide adducts, Alkylphenol ethylene oxide adducts such as oxyethylene octylphenyl ether and polyoxyethylene nonylphenyl ether, fatty acid ethylene oxide adducts such as polyethylene glycol monolaurate and polyethylene glycol monooleate, polyhydric alcohol fatty acid ester ethylene oxide adducts, poly Oxyethylene lauryl amino ether, polyoxyethylene stearyl amino ether, etc. Higher alkylamine ethylene oxide adducts, fatty acid amide ethylene oxide adducts such as polyoxyethylene palm fatty acid monoethanol amide, polyoxyethylene lauric acid monoethanol amide, oil and fat ethylene oxide adducts such as polyoxyethylene castor oil, polypropylene glycol ethylene And oxide adducts.

  The polyhydric alcohol type nonionic surfactant is a nonionic surfactant obtained by bonding a hydrophobic group such as a higher fatty acid to a polyhydric alcohol such as glycerol or pentaerythritol. Examples of the polyhydric alcohol type nonionic surfactant include fatty acid esters of glycerol such as glycerol monostearate and glycerol monooleate, fatty acid esters of pentaerythritol such as pentaerythritol beef tallow fatty acid ester, polyoxyethylene sorbitan mono Examples include sorbitol such as laurate and polyoxyethylene sorbitan monostearate, fatty acid esters of sorbitan, fatty acid esters of sucrose, alkyl ethers of polyhydric alcohols, fatty acid amides of alkanolamines such as coconut fatty acid diethanolamide, and the like.

  The amount of the surfactant is desirably 1 to 25 parts by weight with respect to 100 parts by weight of the ethylene / α-olefin elastomer. If it is less than 1 part by weight, it is difficult to improve the affinity with water, which is a modification of the friction transmission surface. On the other hand, if it exceeds 25 parts by weight, there is a problem that the adhesive wear resistance is lowered.

  Further, the viscosity of the surfactant is 20 to 200 (mPa · s / 25 ° C.), and if it is less than 20, the heat resistance of the belt cannot be satisfied, and if it exceeds 200, the friction transmission surface is improved by the surfactant. Quality is not fully demonstrated.

  In addition, when the infrared spectroscopic analysis of the rubber surface blended with the above surfactant was performed, a hydroxyl group corresponding to a hydrophilic group and an ether bond were detected. Therefore, the surfactant improved the hydrophilicity of the friction transmission surface. I understand that. Further, even when the friction transmission surface is worn due to running, the surfactant is always dispersed in the rubber composition that is the compression layer, so that the hydrophilicity of the friction transmission surface is maintained. Actually, the friction transmission surface of the compression layer was polished and subjected to forced wear, and a misalignment test was performed. As a result, the same results as before the abrasion wear were obtained.

  A paraffinic oil softener can also be used in combination. Examples thereof include paraffinic compounds having 4 to 155 carbon atoms, preferably paraffinic compounds having 4 to 50 carbon atoms. Specifically, n-paraffins (linear saturated hydrocarbons) such as butane, pentane, hexane, heptane, octane, nonane, decane, undecane, dodecane, tetradecane, pentadecane, hexadecane, heptadecane, octadecane, etc., isobutane, isopentane, Isoparaffins (branched saturated hydrocarbons) such as neopentane, isohexane, isopentane, neohexane, 2,3-dimethylbutane, 2-methylhexane, 3-methylhexane, 3-ethylpentane, and derivatives of these saturated hydrocarbons Can be mentioned. These paraffins are used in a mixture and are preferably liquid at room temperature.

Commercially available products of the above paraffinic petroleum softeners include NA Solvent (isoparaffinic hydrocarbon oil) manufactured by Nippon Oil & Fats, PW-90 (n-paraffinic process oil) manufactured by Idemitsu Kosan Co., Ltd., and Idemitsu Petrochemical Co., Ltd. Examples include IP-solvent 2835 (synthetic isoparaffinic hydrocarbon, 99.8 wt% or more isoparaffin) manufactured by company, Neothiozol (n-paraffinic process oil) manufactured by Sanko Chemical Co., Ltd., and the like.
The blending amount of the paraffinic petroleum softener is desirably 3 to 20 parts by weight with respect to 100 parts by weight of the ethylene / α-olefin elastomer. Within this range, the amount of the surfactant added can be reduced, and the hydrophilicity of the friction transmission surface can be maintained.

  The rubber composition improves the water wettability of the friction transmission surface, improves the quietness by increasing the adhesion to the pulley of the belt even during water injection, and exhibits moderate bleeding and acts as a lubricant. As a result, sound generation during running can be suppressed, and cracking of the friction transmission surface can be prevented to improve belt durability.

  The rubber composition can contain an organic peroxide as a crosslinking agent. Examples of the organic peroxide include dicumyl peroxide, di-t-butyl peroxide, t-butylcumyl peroxide, benzoyl peroxide, 1,3-bis (t-butylperoxyisopropyl) benzene, 2,5 -Dimethyl-2,5-di (t-butylperoxy) hexyne-3,2,5-dimethyl-2,5- (benzoylperoxy) hexane, 2,5-dimethyl-2,5-mono (t- Butyl peroxy) hexane and the like. This organic peroxide is preferably used alone or as a mixture in the range of 0.5 to 8 parts by weight with respect to 100 parts by weight of the elastomer.

  Further, the rubber composition may preferably contain 0.5 to 13 parts by weight of N, N′-m-phenylene dimaleimide and / or quinonedioxime with respect to 100 parts by weight of the elastomer component. N, N′-m-phenylene dimaleimide and / or quinonedioxime acts as a co-crosslinking agent, and if less than 0.5 part by weight, the effect of addition is not significant, and if it exceeds 13 parts by weight, tearing force and adhesion The force drops sharply. At this time, when N, N′-m-phenylene dimaleimide is selected as the co-crosslinking agent, the cross-linking density is high, the wear resistance is high, and the difference in transmission performance between water injection and drying is small. is there. Further, when quinone dioximes are selected, there is a feature that the adhesiveness with the fiber base material is excellent.

  In addition to that, those used in ordinary rubber compounds such as short fibers, anti-aging agents, stabilizers, processing aids, and colorants are used as necessary. There are no particular limitations on the method of mixing these compounding components into the rubber composition, and the kneading can be appropriately carried out by known means and methods using, for example, a Banbury mixer, a kneader or the like.

  The V-ribbed belt is not limited to the configuration shown in FIG. 1, and for example, a V-ribbed belt in which no adhesive layer is disposed, a V-ribbed belt in which rubber is exposed without attaching a canvas to the back, and the like belong to the technical scope of the present invention. . Hereinafter, these embodiments will be described with reference to the drawings.

  The V-ribbed belt 21 shown in FIG. 2 has a stretch layer 25 formed of a rubber composition with a back surface 28 provided with a flocking layer 24, and an adhesive layer 22 disposed below the stretch layer 25. The layer 26 is arranged. The core wire 23 is embedded in the main body along the longitudinal direction of the belt, and a part thereof is in contact with the stretched layer 25 and the remaining part is in contact with the adhesive layer 22. The compressed layer 26 is provided with a plurality of ribs 27 having a substantially triangular cross section extending in the belt longitudinal direction. Here, the short fibers contained in the compressed layer 26 exhibit a flow state along the rib shape, and the short fibers near the surface are oriented along the rib shape.

  A V-ribbed belt 31 shown in FIG. 3 has a configuration in which a back surface 38 is formed of a rubber layer containing a short fiber 34 and a compression layer 36 is disposed below the stretch layer 35. The core wire 33 is embedded in the main body along the longitudinal direction of the belt, and a part thereof is in contact with the stretch layer 35 and the remaining part is in contact with the compression layer 36. The compression layer 35 is provided with a plurality of ribs 37 having a substantially triangular cross section extending in the belt longitudinal direction, and a flocking layer 39 is provided on the rib surface. Here, the short fibers contained in the stretched layer 35 are oriented in a random direction.

  Here, FIG. 3 shows a configuration in which the stretch layer 35 is not formed of a canvas and is formed of a rubber composition containing short fibers, but at this time, in order to suppress abnormal noise during driving of the back surface, An uneven pattern can be provided. Examples of the concavo-convex pattern include a knitted fabric pattern, a woven fabric pattern, a suede woven fabric pattern, and the like, and most preferably a woven fabric pattern. Moreover, as a short fiber, polyester, aramid, nylon, cotton, etc. can be mix | blended as desired. In addition, the same rubber composition as that described above can be used for the rubber composition and the core wire constituting the stretch layer, the compression layer, and the adhesive layer.

  In FIG. 3, the short fibers contained in the stretched layer 35 are oriented in a random direction, but may be oriented in one direction such as in the belt width direction. In addition, when oriented in a random direction, there is a feature that the generation of cracks and cracks from multiple directions can be suppressed. At this time, if a short fiber (for example, a milled fiber) having a bent portion is selected as the short fiber, more It has a feature that it can withstand the force acting from the direction.

  In the case where the adhesive layer is not disposed as shown in FIG. 3, the core wire 33 is embedded in the belt main body at the boundary region between the stretch layer 35 and the compression layer 36. At this time, considering the adhesiveness between the core wire 33 and the belt body, it is desirable that one of the stretched layer 35 and the compressed layer 36 is made of a rubber composition containing no short fibers.

  In FIG. 2, the stretch layer 25 has a structure in which the flocked layer 24 is provided on the surface of the rubber composition that does not contain short fibers, but a flocked layer is provided on the surface of the rubber composition that contains short fibers. It is also possible.

  In FIG. 2, the short fibers contained in the compressed layer 26 are in a flow state along the rib shape, but the short fibers may be oriented in the width direction.

  When the V-ribbed belt performs back surface transmission, the surface of the stretch layer can also be a friction transmission surface. Therefore, the stretch layer may be composed of the rubber composition of the present invention.

  The present embodiment is an example in which the present invention is applied to a V-ribbed belt. However, the present invention is not limited to a V-ribbed belt but can be applied to other types of friction transmission belts.

  Next, the present invention will be specifically described with reference to examples.

Examples 1-5, Comparative Example 1
In the V-ribbed belts of Examples 1 to 4 and Comparative Examples 1 to 4 below, a cord made of a polyester fiber rope is embedded in the adhesive rubber layer, and two plies of rubber cotton canvas are applied to one surface of the adhesive rubber layer. The compressed rubber layer provided on the other surface side of the adhesive rubber layer is laminated and three rib portions are arranged in the longitudinal direction of the belt.

  Here, as a compression layer, EPDM 100 parts by weight, zinc white 5 parts by weight, stearic acid 1 part by weight, HAF carbon black 65 parts by weight, anti-aging agent 2 parts by weight, co-crosslinking agent (N, N′-m-phenylene diene) Maleimide), 8 parts by weight of organic peroxide, 0.3 part by weight of sulfur, and 30 parts by weight of nylon short fibers shown in Table 1, 40 parts by weight of carbon black HAF, 40 parts by weight of carbon black GPF, a predetermined amount of paraffinic oil, It was prepared from a fixed amount of surfactant, kneaded with a Banbury mixer, and then rolled with a calender roll. Here, the above-mentioned short fiber is contained in the compression layer, and the short fiber is oriented in the belt width direction. On the other hand, the adhesive layer has a rubber composition obtained by removing the short fibers from the rubber composition shown in Table 1.

  As a belt manufacturing method, the following known methods were used. First, a 2-ply cotton canvas with rubber and an adhesive rubber layer are wrapped around a flat cylindrical molding mold, a core wire is spun, a compressed rubber layer is wound around, and a vulcanization jacket is placed on the compressed rubber layer. Insert. Next, after the molding mold is placed in a vulcanizing can and vulcanized, the cylindrical vulcanizing sleeve is taken out from the molding mold. Then, the compressed rubber layer of the vulcanization sleeve was ground by a grinder to form a plurality of rib portions, and then cut into individual belts by a cutter to finish a V-ribbed belt.

  Next, a TS friction test, a transmission performance test, a high temperature low tension bending fatigue test, and a misalignment pronunciation test were performed as described below. The results are shown in Table 1.

  In the TS friction test, a V-ribbed belt is hung on a guide roller (diameter 60 mm) so that the winding angle of the V-ribbed belt is 90 degrees, one end of the V-ribbed belt is fixed, and a weight of 1.75 kgf / 3 rib is attached to the other end. The tension T1 on the tension side and the tension T2 on the loose side are detected by detecting the value of the load cell when the guide roller is rotated at 43 rpm, and the friction coefficient μ = from the tension ratio (T1 / T2). (1 / 2π) ln (T1 / T2) was determined. The friction coefficient was evaluated at the time of drying (DRY) and at the time of water injection (WET) at 60 cc / min.

  In the transmission performance test, a driving pulley (diameter 120 mm) and a driven pulley (diameter 120 mm) are arranged in this order. Then, V-ribbed belts were hung on both pulleys of the test machine, and the driven pulley was run under a test condition of a rotational speed of the drive pulley of 2000 rpm and a belt tension of 15.3 kgf / 3 rib, and 2% slip. The transmission power (kw) was measured.

  The running test machine used for the evaluation of the high temperature low tension bending fatigue test is composed of a drive pulley (diameter 120 mm), an idler pulley (diameter 85 mm), a driven pulley (diameter 120 mm), and a tension pulley (diameter 45 mm) in this order. It is a thing. A V-ribbed belt is hung on each pulley of the testing machine, the winding angle of the V-ribbed belt around the tension pulley is 90 degrees, the winding angle around the idler pulley is 120 degrees, the ambient temperature is 120 ° C., and the rotational speed of the driving pulley Under the test conditions of 4900 rpm and belt tension of 40 kgf / 3 rib, a load is applied to the driving pulley to run the V-ribbed belt, and the driven pulley is run with a load of 12 PS. The running time was discontinued at 400 hours, and the time until six cracks reaching the core line occurred was examined.

  In the misalignment sound generation test, a drive pulley (diameter 125 mm), a driven pulley (diameter 125 mm), and a tension pulley (diameter 60 mm) are arranged, and the axial separation between the drive pulley and the driven pulley is 212 mm, and the misalignment at a predetermined angle is adjusted. did. A V-ribbed belt was hung on each pulley of the test machine, and a load was applied to the drive pulley so that the rotation speed of the drive pulley was 1000 rpm and the belt tension was 6 kgf / rib under room temperature conditions, and the vehicle was run with misalignment. The angle (pronunciation limit angle) at the time of sound generation was determined. At the same time, the sound generation limit angle at the time of wet injection (200 cc) between the driving pulley and the driven pulley was obtained.

  From the results of Table 1, although the TS friction coefficient in Examples 1 to 5 is slightly lower than that in Comparative Example 1, no difference is seen in transmission performance. In addition, in Examples 1 to 5, while maintaining durability that is sufficiently satisfactory as 400 hours in durability performance, misalignment sound generation has a larger misalignment angle especially in wet (water) state than Comparative Example 1, and sound generation It was difficult to obtain results. Further, since the limit sounding angle of the misalignment sounding test after 50 hours of running is not changed from that immediately after running, it can be seen that the hydrophilicity is maintained even if the friction transmission surface is worn.

  Thus, in this Example which mix | blended surfactant, it turns out that frictional noise, such as misalignment, also decreased as a result of hydrophilicity improving especially the friction transmission surface by presence of surfactant. As a result of infrared spectroscopic analysis of the surface of the friction transmission surface, hydroxyl groups and ether bonds corresponding to hydrophilic groups were detected, and it was confirmed that the friction transmission surface has hydrophilicity.

  The friction transmission belt according to the present invention can be attached to a drive device for automobiles or general industries.

It is a section perspective view of the V ribbed belt which is a friction transmission belt concerning the present invention. It is sectional drawing of another V-ribbed belt which is a friction transmission belt which concerns on this invention. It is sectional drawing of another V-ribbed belt which is a friction transmission belt which concerns on this invention.

Explanation of symbols

1 V-ribbed belt 2 Core wire 3 Adhesive layer 4 Compression layer 5 Stretch layer 6 Rib part

Claims (4)

  A friction transmission belt characterized in that at least the friction transmission surface is composed of a rubber composition in which 1 to 25 parts by weight of a surfactant is blended with 100 parts by weight of an ethylene / α-olefin elastomer.   The friction transmission belt according to claim 2, wherein the surfactant has a viscosity of 20 to 200 (mPa · s / 25 ° C.).   The friction transmission belt according to claim 1 or 2, wherein 3 to 20 parts by weight of a paraffinic petroleum softener is blended with 100 parts by weight of the ethylene / α-olefin elastomer.   The friction transmission belt according to any one of claims 1 to 3, wherein the friction transmission belt is a V-ribbed belt.

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