WO2010047029A1 - 伝動ベルト用ゴム組成物及びそれを用いた伝動ベルト - Google Patents
伝動ベルト用ゴム組成物及びそれを用いた伝動ベルト Download PDFInfo
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- WO2010047029A1 WO2010047029A1 PCT/JP2009/004094 JP2009004094W WO2010047029A1 WO 2010047029 A1 WO2010047029 A1 WO 2010047029A1 JP 2009004094 W JP2009004094 W JP 2009004094W WO 2010047029 A1 WO2010047029 A1 WO 2010047029A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
- C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
- F16G1/00—Driving-belts
- F16G1/06—Driving-belts made of rubber
- F16G1/08—Driving-belts made of rubber with reinforcement bonded by the rubber
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
- C08K5/0025—Crosslinking or vulcanising agents; including accelerators
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K5/098—Metal salts of carboxylic acids
Definitions
- the present invention relates to a rubber composition for a transmission belt and a transmission belt using the same.
- a belt body is formed of a rubber composition in which an ethylene- ⁇ -olefin elastomer is used as a raw material rubber and an unsaturated carboxylic acid metal salt is blended therein.
- Patent Document 1 discloses a rubber composition for a transmission belt in which a synthetic rubber whose main chain is a fully saturated rubber is used as a raw rubber, and an organic peroxide and an ethylenically unsaturated carboxylic acid metal salt are blended with the raw rubber. ing.
- Patent Document 2 discloses a rubber for a transmission belt in which EPDM having an ethylene content of 50 to 65% by mass is used as a raw rubber, and 32 to 100 parts by mass of an unsaturated carboxylic acid metal salt is blended with 100 parts by mass of the raw rubber. A composition is disclosed.
- Patent Document 3 discloses a rubber composition for a transmission belt in which an ethylene- ⁇ -olefin elastomer is used as a raw rubber, and 1 to 30 parts by weight of an unsaturated carboxylic acid metal salt is blended with 100 parts by weight of the raw rubber. ing.
- An object of the present invention is to stably perform a high load transmission over a long period of time by forming a pulley contact portion of a transmission belt with a rubber composition whose friction coefficient due to belt running is small.
- the rubber composition for a power transmission belt of the present invention comprises an ethylene propylene diene monomer rubber (hereinafter referred to as “EPDM”) having an ethylene content of 66 to 85% by mass, an ethylene butene copolymer (hereinafter referred to as “EBM”), and an ethylene octene copolymer. (Hereinafter referred to as “EOM”) 32 to 100 parts by mass of ⁇ , ⁇ -unsaturated carboxylic acid metal salt with respect to 100 parts by mass of ethylene- ⁇ -olefin elastomer containing 5% by mass or more and less than 40% by mass in total. Parts are blended and no elastomer other than the ethylene- ⁇ -olefin elastomer is blended, or less than 10 parts by weight is blended.
- EPDM ethylene propylene diene monomer rubber
- EBM ethylene butene copolymer
- EOM ethylene octene copolymer
- the average ethylene content of EPDM contained in the ethylene- ⁇ -olefin elastomer is preferably 66 to 85% by mass.
- the ethylene- ⁇ -olefin elastomer preferably contains 5 to 95% by mass of ethylene propylene rubber (hereinafter referred to as “EPM”).
- the transmission belt of the present invention has a pulley contact portion formed of the above rubber composition for a transmission belt.
- the rubber composition for a transmission belt includes an ethylene- ⁇ -olefin containing at least one of EPDM, EBM, and EOM having an ethylene content of 66 to 85% by mass in a total amount of 5% by mass or more and less than 40% by mass. While 100 to 100 parts by mass of the elastomer is mixed with 32 to 100 parts by mass of an ⁇ , ⁇ -unsaturated carboxylic acid metal salt, no elastomer other than the ethylene- ⁇ -olefin elastomer is blended or the blending amount is 10 Since the amount is less than part by mass, the change with time of the friction coefficient due to belt running is reduced. Moreover, since the pulley contact part is formed with the rubber composition for transmission belts, the transmission belt of this invention can perform high load transmission stably over a long period of time.
- FIG. 1 shows a flat belt B according to the embodiment.
- This flat belt B is suitably used for high load transmission applications, and specific applications include, for example, drive transmission applications for blowers, compressors, and generators.
- the flat belt B is formed, for example, with a belt circumferential length of 60 to 4000 mm, a belt width of 3 to 100 mm, and a belt thickness of 0.3 to 10 mm.
- the rubber composition for the transmission belt forming the belt body rubber layer 11 (hereinafter referred to as the transmission belt rubber composition R) is made of an ethylene- ⁇ -olefin elastomer as the raw rubber, and the ethylene- ⁇ -olefin elastomer is At least one of EPDM, EBM, and EOM having an ethylene content of 66 to 85% by mass is contained in a total amount of 5% by mass or more and less than 40% by mass.
- the rubber composition R for a transmission belt has a coefficient of friction due to belt running when the total amount of EPDM, EBM, and EOM in which the ethylene content in the ethylene- ⁇ -olefin elastomer is 66 to 85% by mass is less than 5% by mass.
- the stability over time deteriorates, whereas when it is 40% by mass or more, the cold resistance deteriorates.
- EPDM having an ethylene content of 66 to 85% by mass examples include, for example, Nordel IP 4770R (ethylene content 70% by mass) manufactured by Dow Chemical, Nordel 4820P (ethylene content 85% by mass), and EP57F (ethylene content 66 manufactured by JSR). Mass%), EP51 (ethylene content 67 mass%), Lanxess Buna EP G6470 (ethylene content 70 mass%), and the like.
- EBMs examples include Engage 7447 and Engage 7270 manufactured by Dow Chemical.
- EOM examples include Engage 8130 and Engage 8003 manufactured by Dow Chemical.
- examples of the elastomer other than EPDM, EBM, and EOM having an ethylene content of 66 to 85% by mass include EPDM and EPM having an ethylene content of less than 66% by mass. It is done.
- the ethylene- ⁇ -olefin elastomer preferably contains 5 to 95% by mass of EPM, more preferably 5 to 90% by mass, and further preferably 5 to 70% by mass. preferable.
- the raw rubber is formed of an ethylene- ⁇ -olefin elastomer containing 5 to 95% by mass of EPM, more excellent stability over time can be obtained.
- EPM examples include EP11 manufactured by JSR, Esprene 201 manufactured by Sumitomo Chemical Co., Ltd., and the like.
- the EPDM contained in the ethylene- ⁇ -olefin elastomer preferably has an average ethylene content of 66 to 85% by mass.
- the average ethylene content of EPDM means the sum of the ethylene contents of each EPDM multiplied by the mass percentage of the EPDM.
- the transmission belt rubber composition R may be composed of only an ethylene- ⁇ -olefin elastomer, but may contain an elastomer other than the ethylene- ⁇ -olefin elastomer for the purpose of imparting hydrophilicity or other properties. .
- the transmission belt rubber composition R contains an elastomer other than the ethylene- ⁇ -olefin elastomer, the blending amount thereof is less than 10 parts by mass with respect to 100 parts by mass of the ethylene- ⁇ -olefin elastomer.
- the amount of the elastomer other than the ethylene- ⁇ -olefin elastomer is too large, the mechanical properties and durability inherent in the ethylene- ⁇ -olefin elastomer may be adversely affected. Since it is less than 10 parts by mass with respect to 100 parts by mass of the ethylene- ⁇ -olefin elastomer, such an adverse effect does not occur.
- elastomers other than ethylene- ⁇ -olefin elastomers include hydrogenated acrylonitrile rubber (H-NBR), chloroprene rubber (CR), acrylonitrile butadiene rubber (NBR), styrene butadiene rubber (SBR), and alkylated chlorosulfonated polyethylene. (ACSM), epichlorohydrin (ECO), butadiene rubber (BR), polyisoprene rubber (IR), chlorinated polyethylene (CM) and the like.
- the rubber composition R for power transmission belts contains an ⁇ , ⁇ -unsaturated carboxylic acid metal salt as a co-crosslinking agent.
- the blending amount of the ⁇ , ⁇ -unsaturated carboxylic acid metal salt is 32 to 100 parts by weight, preferably 32 to 80 parts by weight, and preferably 32 to 70 parts by weight with respect to 100 parts by weight of the ethylene- ⁇ -olefin elastomer. More preferably, it is a part.
- the blending amount of the ⁇ , ⁇ -unsaturated carboxylic acid metal salt is less than 32 parts by mass, sufficient elastic modulus cannot be obtained, and high load transmission becomes unstable.
- the amount is more than 100 parts by mass, the bending fatigue resistance is deteriorated, cracks are generated, and the belt may be decomposed.
- Examples of the ⁇ , ⁇ -unsaturated carboxylic acid metal salt include zinc dimethacrylate, magnesium dimethacrylate, and zinc diacrylate.
- the ⁇ , ⁇ -unsaturated carboxylic acid metal salt is contained in, for example, High Cross ZT manufactured by Seiko Chemical Co., SR636 manufactured by Sartomer.
- examples of the compounding agent other than the ⁇ , ⁇ -unsaturated carboxylic acid metal salt include, for example, a crosslinking agent, a crosslinking assistant, a crosslinking accelerator, an anti-aging agent, Reinforcing materials, fillers, reinforcing agents, plasticizers, processing aids, stabilizers, colorants and the like can be mentioned.
- a crosslinking agent such as a crosslinking agent, a crosslinking assistant, a crosslinking accelerator, an anti-aging agent, Reinforcing materials, fillers, reinforcing agents, plasticizers, processing aids, stabilizers, colorants and the like can be mentioned.
- a crosslinking agent such as a crosslinking assistant, a crosslinking accelerator, an anti-aging agent, Reinforcing materials, fillers, reinforcing agents, plasticizers, processing aids, stabilizers, colorants and the like can be mentioned.
- a crosslinking agent such as a crosslinking assistant, a crosslinking
- the rubber composition R for the transmission belt may contain short fibers.
- the short fibers include aramid short fibers, nylon short fibers, polyester short fibers, cotton short fibers, carbon short fibers, and the like.
- the short fiber may be composed of a single species or a plurality of species.
- the content of the short fiber is, for example, 1 to 10 parts by mass and preferably 2 to 5 parts by mass with respect to 100 parts by mass of the raw rubber.
- the short fiber has a fiber length of 1 to 5 mm, for example.
- the short fibers are preferably arranged so as to be oriented in the belt width direction. As a result, it is possible to prevent the rubber from flowing excessively during belt molding and disturbing the arrangement of the core wires 12.
- the short fiber may be subjected to an adhesion treatment such as a treatment of heating after being immersed in an RFL aqueous solution or a treatment of being dried after being immersed in rubber paste.
- an adhesion treatment such as a treatment of heating after being immersed in an RFL aqueous solution or a treatment of being dried after being immersed in rubber paste.
- the short fibers may not be blended in the rubber layer other than the rubber layer holding the core wires 12, From the viewpoint of suppressing the occurrence of slip and abnormal noise during water, short fibers may be blended.
- the rubber composition R for a transmission belt having the above configuration 32 to 100 parts by mass of an ⁇ , ⁇ -unsaturated carboxylic acid metal salt is blended with 100 parts by mass of the ethylene- ⁇ -olefin elastomer, and ethylene- ⁇ - Since an elastomer other than an olefin elastomer is not blended or less than 10 parts by mass is blended, a sufficiently high elastic modulus can be obtained, and a change with time of the friction coefficient due to belt running is reduced, and a high load transmission is possible. .
- this rubber composition R for power transmission belts can be molded after preparing an uncrosslinked rubber composition by a conventionally known method.
- an uncrosslinked rubber composition is obtained by, for example, charging an elastomer and a compounding agent into a closed kneader and kneading. Then, the prepared uncrosslinked rubber composition is subjected to belt molding and simultaneously heated and pressurized to be crosslinked to obtain a crosslinked rubber composition.
- the flat belt B has a configuration in which a core wire 12 is embedded in the belt main body rubber layer 11 so as to form a spiral extending in the belt length direction and having a pitch in the belt width direction.
- the belt main body rubber layer 11 is configured in a band shape having a horizontally long cross section.
- the belt main body rubber layer 11 is formed of the above-described rubber composition R for power transmission belts.
- the core wire 12 is made of twisted yarn such as aramid fiber, vinylon fiber, polyester fiber, polyketone fiber, carbon fiber, poly-p-phenylenebenzobisoxazole (PBO) fiber, glass fiber, and the like.
- the core wire 12 has a core wire diameter of 0.1 to 3 mm.
- the core wire 12 may be subjected to an adhesion process such as a process of heating after being immersed in an RFL aqueous solution in advance or a process of drying after being immersed in rubber paste.
- the pulley contact portion is formed from the rubber composition for the transmission belt, in which the change in the friction coefficient due to belt running is small, so that high load transmission is stably performed over a long period of time. be able to.
- the flat belt B can be manufactured by a conventionally known method.
- the flat belt B has a single-layer structure of the belt main body rubber layer 11.
- the present invention is not particularly limited thereto.
- a laminated body of three layers of the core wire holding layer 23 in which the core wire 22 is embedded and the outer rubber layer 24 on the belt outer peripheral side may be used.
- at least the inner rubber layer 21 serving as the pulley contact portion may be configured using the rubber composition of the present invention.
- it is preferable that short fibers are blended in the core wire holding layer 23.
- the inner rubber layer 21 and the outer rubber layer 24 may not be blended with short fibers in order to obtain a high coefficient of friction, and may be blended with short fibers in order to suppress slippage and abnormal noise generation when wet. Also good.
- the belt outer peripheral side of the flat belt B may be covered with a reinforcing cloth.
- the transmission belt is described as a flat belt, but it may be a friction transmission belt such as a V-belt or a V-ribbed belt, or a meshing transmission belt such as a toothed belt.
- a friction transmission belt such as a V-belt or a V-ribbed belt
- a meshing transmission belt such as a toothed belt.
- the transmission belt is a V-ribbed belt
- at least the rib pulley contact portion of the V-rib is formed of the transmission belt rubber composition R.
- the transmission belt is a toothed belt
- at least the toothed pulley contact portion of the tooth portion is formed of the rubber composition R for the transmission belt.
- Test evaluation belt The flat belts of Examples 1 to 18 and Comparative Examples 1 to 8 below were produced. Each configuration is also shown in Tables 1 to 4.
- a rubber composition for forming a belt main body rubber layer was prepared.
- EPDM (1) Suditomo Chemical Co., Ltd., trade name: Esprene 301, ethylene content 62 mass%) 70 mass% and EPDM (2) (Dow Chemical Co., trade name: Nordel IP 4770R, ethylene content 70 mass%) 30
- the material rubber kneaded at a rate of mass% is used as a raw rubber, and 100 parts by weight of this raw rubber, 50 parts by weight of carbon black (manufactured by Tokai Carbon Co., Ltd., trade name: Seast SO), process oil (manufactured by Nippon San Oil Co., Ltd., commercial product) Name: Thumper 2280) 5 parts by mass, zinc oxide (manufactured by Sakai Chemical Industry Co., Ltd., trade name: 3 types of zinc oxide), 5 parts by mass, stearic acid (manufactured by Shin Nippon Chemical Co., Ltd., trade name: stearic acid (manu
- a flat belt was produced using this uncrosslinked rubber composition as a belt body rubber, and this was designated as Example 1.
- the flat belt had a belt width of 10 mm and a belt thickness of 1.0 mm, and the short fibers were provided so as to be oriented in the belt width direction.
- the core wire is composed of aramid fiber (manufactured by Teijin Ltd., trade name: Technora) twisted yarn (890 dtex / 1 ⁇ 3, core wire diameter 0.58 mm, core wire winding pitch 0.65 mm) in the belt thickness direction. Just placed in the center.
- Example 2 Except that the rubber composition forming the belt body rubber layer was kneaded at a ratio of 95 mass% of EPDM (1) and 5 mass% of EPDM (2) as a raw rubber, it had the same configuration as in Example 1. A flat belt was produced and used as Example 2. The raw rubber of this rubber composition had an EPDM average ethylene content of 62.4% by mass.
- Example 3 The rubber composition forming the belt body rubber layer was kneaded at a ratio of 95% by mass of EPDM (1) and 5% by mass of EPDM (3) (manufactured by Dow Chemical, trade name: Nordel 4820P, ethylene content: 85% by mass). A flat belt having the same configuration as in Example 1 was produced except that the material rubber was used as raw material rubber. The raw rubber of this rubber composition had an average ethylene content of EPDM of 63.2% by mass.
- Example 4 Except that the rubber composition forming the belt body rubber layer was kneaded at a ratio of 95% by mass of EPDM (1) and 5% by mass of EBM (product name: Engage 7467) as a raw rubber. Thus, a flat belt having the same configuration as in Example 1 was produced, and this was designated as Example 4. The raw rubber of this rubber composition had an average ethylene content of EPDM of 62% by mass.
- Example 5 Except that the rubber composition forming the belt body rubber layer was kneaded at a ratio of 95% by mass of EPDM (1) and 5% by mass of EOM (product name: Engage 8003) as raw material rubber. A flat belt having the same configuration as that of Example 1 was produced. The raw rubber of this rubber composition had an average ethylene content of EPDM of 62% by mass.
- the rubber composition forming the belt body rubber layer is a ratio of 5% by mass of EPM (manufactured by JSR, trade name: EP11, ethylene content 52% by mass), 65% by mass of EPDM (1) and 30% by mass of EPDM (2).
- EPM manufactured by JSR, trade name: EP11, ethylene content 52% by mass
- EPDM ethylene content 52% by mass
- a flat belt having the same configuration as that of Example 1 was produced except that the rubber kneaded was used as a raw material rubber.
- the raw rubber of this rubber composition had an average ethylene content of EPDM of 64.5% by mass.
- Example 7 Example 1 except that the rubber composition forming the belt main body rubber layer was kneaded at a ratio of 10 mass% of EPM, 60 mass% of EPDM (1) and 30 mass% of EPDM (2) as a raw rubber. A flat belt having the same structure as that of Example 7 was produced. The raw rubber of this rubber composition had an average ethylene content of EPDM of 64.7% by mass.
- Example 8 Example 1 except that the rubber composition forming the belt main body rubber layer was kneaded at a ratio of 30 mass% EPM, 35 mass% EPDM (1) and 35 mass% EPDM (2) as a raw rubber. A flat belt having the same configuration as that of Example 8 was produced. The raw rubber of this rubber composition had an average ethylene content of EPDM of 66% by mass.
- Example 9 Example 1 except that the rubber composition forming the belt main body rubber layer was kneaded at a ratio of 50 mass% EPM, 25 mass% EPDM (1) and 25 mass% EPDM (2) as a raw rubber. A flat belt having the same structure as that of Example 9 was produced. The raw rubber of this rubber composition had an average ethylene content of EPDM of 66% by mass.
- Example 10 A flat belt having the same configuration as in Example 1 was prepared except that the rubber composition forming the belt main body rubber layer was kneaded at a ratio of 70% by mass of EPM and 30% by mass of EPDM (2) as a raw rubber. This was designated Example 10.
- the raw rubber of this rubber composition had an average ethylene content of EPDM of 70% by mass.
- Example 11 A flat belt having the same configuration as in Example 1 was prepared except that the rubber composition forming the belt main body rubber layer was kneaded at a ratio of 90% by mass of EPM and 10% by mass of EPDM (2) as raw material rubber. This was designated as Example 11.
- the raw rubber of this rubber composition had an average ethylene content of EPDM of 70% by mass.
- Example 12 A flat belt having the same configuration as in Example 1 was prepared except that the rubber composition forming the belt main body rubber layer was kneaded at a ratio of 95% by mass of EPM and 5% by mass of EPDM (2) as raw material rubber. This was designated Example 12.
- the raw rubber of this rubber composition had an average ethylene content of EPDM of 70% by mass.
- Example 13 A flat belt having the same configuration as in Example 1 was prepared except that the rubber composition forming the belt main body rubber layer was kneaded at a ratio of 95% by mass of EPM and 5% by mass of EPDM (3) as raw material rubber. This was designated as Example 13.
- the raw rubber of this rubber composition had an average ethylene content of EPDM of 85% by mass.
- Example 14 A flat belt having the same configuration as that of Example 1 was prepared except that a rubber composition for forming the belt main body rubber layer was kneaded at a ratio of 95% by mass of EPM and 5% by mass of EBM was used as a raw rubber. Example 14 was taken.
- Example 15 A flat belt having the same configuration as that of Example 1 was prepared except that the rubber composition forming the belt main body rubber layer was kneaded at a ratio of 95% by mass of EPM and 5% by mass of EOM as a raw rubber. Example 15 was taken.
- Example 16> A flat belt having the same configuration as that of Example 8 was prepared except that the amount of the co-crosslinking agent in the rubber composition forming the belt main body rubber layer was 70 parts by mass. This rubber composition had a content of zinc dimethacrylate of 49 parts by mass.
- Example 17 A flat belt having the same configuration as in Example 8 was prepared except that the blending amount of the co-crosslinking agent of the rubber composition forming the belt main body rubber layer was 142.9 parts by mass, and this was designated as Example 17.
- This rubber composition had a zinc dimethacrylate content of 100 parts by mass.
- Example 18 A flat belt having the same configuration as that of Example 16 was prepared except that 8 parts by mass of H-NBR (manufactured by Nippon Zeon Co., Ltd., trade name: Zetpol 2020) was further added to the rubber composition forming the belt main body rubber layer. This was taken as Example 18.
- H-NBR manufactured by Nippon Zeon Co., Ltd., trade name: Zetpol 2020
- Example 19 32.2 parts by mass of zinc diacrylate (trade name: ACT ZA, manufactured by Kawaguchi Chemical Industry Co., Ltd.) instead of the co-crosslinking agent containing zinc dimethacrylate was added to the rubber composition forming the belt body rubber layer.
- a flat belt having the same configuration as that of Example 6 was prepared, and this was taken as Example 19.
- Example 20 32.2 parts by mass of magnesium dimethacrylate (trade name: High Cloth GT) instead of a co-crosslinking agent containing zinc dimethacrylate was added to the rubber composition forming the belt body rubber layer. Except for this, a flat belt having the same configuration as in Example 6 was produced.
- magnesium dimethacrylate trade name: High Cloth GT
- Example 3 A flat belt having the same configuration as in Example 1 was prepared except that the rubber composition forming the belt main body rubber layer was kneaded at a ratio of 50 mass% of EPM and 50 mass% of EPDM as raw material rubber. This was designated as Comparative Example 3.
- the raw rubber of this rubber composition had an average ethylene content of EPDM of 70% by mass.
- Example 7 A flat belt having the same configuration as in Example 8 was produced except that the amount of the co-crosslinking agent in the rubber composition forming the belt main body rubber layer was 150 parts by mass. This rubber composition had a zinc dimethacrylate content of 105 parts by mass.
- FIG. 3 shows a pulley layout of the belt running test machine 30 used in the heat resistant running test. This belt running test machine 30 is also used in a cold running test described later.
- the belt running test machine 30 is provided in a large diameter flat pulleys 31 and 32 having a pulley diameter of 120 mm (upper side is a driven pulley and lower side is a driving pulley) and are arranged in the middle in the vertical direction between them.
- the driven flat pulley 33 having a small diameter of 50 mm is arranged so that the belt winding angle around the driven flat pulley 33 is 90 °.
- Each of the flat belts (belt width 10 mm) of Examples 1 to 18 and Comparative Examples 1 to 8 was wound around the belt running test machine 30. Then, a load torque of 8.8 kW is applied to the large diameter flat pulley 31 and a dead weight of 98 N is applied to the small diameter flat pulley 33 to the side, and the driving flat pulley 32 is rotated clockwise at 4800 rpm at an ambient temperature of 120 ° C. The time until the flat belt was disassembled and travel became impossible was measured. The belt running was terminated when 500 hours passed from the start of the belt running.
- a noise meter was installed at a position 50 mm above the large-diameter flat pulley 31 and a noise level of 5 dB or more was observed with respect to the noise level 1 minute after the start of belt running. , And evaluated as “abnormal noise generation”.
- FIG. 4 shows a friction coefficient measuring device 40.
- the friction coefficient measuring device 40 includes a flat pulley 42 having a pulley diameter of 60 mm and a load cell 41 provided on the side thereof.
- the flat pulley 42 is made of an iron-based material S45C. Note that the test piece described later extends horizontally from the load cell 41 toward the flat pulley 42 and is then wound around the flat pulley 42, that is, provided so that the winding angle around the flat pulley 42 is 90 °. .
- each test piece (flat belt) was fixed to the load cell 41 and wound around the flat pulley 42 on the load cell 41, and a weight 43 of 1.75 kg was attached to the other end and suspended. Subsequently, the flat pulley 42 is rotated at a rotational speed of 43 rpm in a direction in which the weight 43 is to be pulled down, and at 60 seconds after the start of rotation, the load cell 41 is placed between the load cell 41 of the test piece and the flat pulley 42. The tension Tt applied to the horizontal part was measured. The tension Ts applied to the vertical portion between the flat pulley 42 and the weight 43 of the test piece was 17.15 N corresponding to the weight of the weight 43.
- the stability of the friction coefficient was evaluated by calculating the change over time of the friction coefficient from the value of the friction coefficient after 24 hours, after 100 hours, and after 500 hours.
- ⁇ Cold resistance test> Each of the flat belts (belt width 10 mm) of Examples 1 to 18 and Comparative Examples 1 to 8 was wound around the belt running test machine 30. Then, a dead weight of 98 N was given to the small diameter flat pulley 33 on the side, and a cold running test was performed at an ambient temperature of ⁇ 45 ° C. In the cold resistance running test, the cycle was repeated for 5 seconds and stopped for 2 seconds for a total of 7 seconds until a crack occurred on the rubber surface of the belt. The belt running was terminated when 1000 cycles were repeated.
- Table 9 shows the results of comparison of Examples 8, 16, and 17 and Comparative Examples 6 and 7 in which the content of zinc dimethacrylate was varied based on the results of Tables 5-7.
- Examples 6 to 18 in which EPM is contained in the ethylene- ⁇ -olefin elastomer in an amount of 5% by mass or more are compared with Examples 1 to 5 in which EPM is not contained. Then, it turns out that the former has a smaller time-dependent change of a friction coefficient than the latter.
- the present invention is useful for a rubber composition and a transmission belt using the rubber composition.
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Abstract
Description
ベルト本体ゴム層11を形成する伝動ベルト用ゴム組成物(以下、伝動ベルト用ゴム組成物Rとする。)は、原料ゴムがエチレン-α-オレフィンエラストマーであり、そのエチレン-α-オレフィンエラストマーはエチレン含量が66~85質量%のEPDM、EBM、及びEOMの少なくとも1種類を合計で5質量%以上40質量%未満含んでいる。伝動ベルト用ゴム組成物Rは、エチレン-α-オレフィンエラストマー中のエチレン含量が66~85質量%のEPDM、EBM、及びEOMの合計量が5質量%よりも小さいときはベルト走行による摩擦係数の経時安定性が悪くなり、一方、40質量%以上であるときは耐寒性が悪くなる。
次に、平ベルトBの具体的な構成について説明する。平ベルトBは、ベルト本体ゴム層11に、ベルト長さ方向に延びると共にベルト幅方向にピッチを有する螺旋を形成するように心線12が埋設された構成のものである。
[試験評価]
平ベルトについて行った試験評価について説明する。
以下の実施例1~18及び比較例1~8の平ベルトを作製した。それぞれの構成は表1~4にも示す。
まず、ベルト本体ゴム層を形成するゴム組成物を調製した。EPDM(1)(住友化学社製、商品名:エスプレン301、エチレン含量62質量%)70質量%及びEPDM(2)(Dow Chemical社製、商品名:Nordel IP 4770R、エチレン含量70質量%)30質量%の割合で混練したものを原料ゴムとして、この原料ゴム100質量部に対し、カーボンブラック(東海カーボン社製、商品名:シーストSO)50質量部、プロセスオイル(日本サン石油社製、商品名:サンパー2280)5質量部、酸化亜鉛(堺化学工業社製、商品名:酸化亜鉛3種)5質量部、ステアリン酸(新日本理化社製、商品名:ステアリン酸50S)0.5質量部、老化防止剤(大内新興化学工業社製、商品名:ノクラックMB)2質量部、共架橋剤(川口化学工業社製、商品名:アクターZMA、ジメタクリル酸亜鉛を70質量%含有)46質量部、有機過酸化物(日本油脂社製、商品名:ペロキシモンF40)6質量部、及び、アラミド短繊維(帝人社製、商品名:テクノーラ3mmカットファイバー)3質量部を配合して混練機で混練し、未架橋ゴム組成物を得た。この未架橋ゴム組成物は、EPDMの平均エチレン含量が64.4質量%であった。また、ジメタクリル酸亜鉛の含有量は32.2質量部であった。
ベルト本体ゴム層を形成するゴム組成物を、EPDM(1)95質量%及びEPDM(2)5質量%の割合で混練したものを原料ゴムとしたことを除いて、実施例1と同一構成の平ベルトを作製し、これを実施例2とした。このゴム組成物の原料ゴムは、EPDMの平均エチレン含量が62.4質量%であった。
ベルト本体ゴム層を形成するゴム組成物を、EPDM(1)95質量%及びEPDM(3)(Dow Chemical社製、商品名:Nordel 4820P、エチレン含量85質量%)5質量%の割合で混練したものを原料ゴムとしたことを除いて、実施例1と同一構成の平ベルトを作製し、これを実施例3とした。このゴム組成物の原料ゴムは、EPDMの平均エチレン含量が63.2質量%であった。
ベルト本体ゴム層を形成するゴム組成物を、EPDM(1)95質量%及びEBM(Dow Chemical社製、商品名:エンゲージ7467)5質量%の割合で混練したものを原料ゴムとしたことを除いて、実施例1と同一構成の平ベルトを作製し、これを実施例4とした。このゴム組成物の原料ゴムは、EPDMの平均エチレン含量が62質量%であった。
ベルト本体ゴム層を形成するゴム組成物を、EPDM(1)95質量%及びEOM(Dow Chemical社製、商品名:エンゲージ8003)5質量%の割合で混練したものを原料ゴムとしたことを除いて、実施例1と同一構成の平ベルトを作製し、これを実施例5とした。このゴム組成物の原料ゴムは、EPDMの平均エチレン含量が62質量%であった。
ベルト本体ゴム層を形成するゴム組成物を、EPM(JSR社製、商品名:EP11、エチレン含量52質量%)5質量%、EPDM(1)65質量%及びEPDM(2)30質量%の割合で混練したものを原料ゴムとしたことを除いて、実施例1と同一構成の平ベルトを作製し、これを実施例6とした。このゴム組成物の原料ゴムは、EPDMの平均エチレン含量が64.5質量%であった。
ベルト本体ゴム層を形成するゴム組成物を、EPM10質量%、EPDM(1)60質量%及びEPDM(2)30質量%の割合で混練したものを原料ゴムとしたことを除いて、実施例1と同一構成の平ベルトを作製し、これを実施例7とした。このゴム組成物の原料ゴムは、EPDMの平均エチレン含量が64.7質量%であった。
ベルト本体ゴム層を形成するゴム組成物を、EPM30質量%、EPDM(1)35質量%及びEPDM(2)35質量%の割合で混練したものを原料ゴムとしたことを除いて、実施例1と同一構成の平ベルトを作製し、これを実施例8とした。このゴム組成物の原料ゴムは、EPDMの平均エチレン含量が66質量%であった。
ベルト本体ゴム層を形成するゴム組成物を、EPM50質量%、EPDM(1)25質量%及びEPDM(2)25質量%の割合で混練したものを原料ゴムとしたことを除いて、実施例1と同一構成の平ベルトを作製し、これを実施例9とした。このゴム組成物の原料ゴムは、EPDMの平均エチレン含量が66質量%であった。
ベルト本体ゴム層を形成するゴム組成物を、EPM70質量%及びEPDM(2)30質量%の割合で混練したものを原料ゴムとしたことを除いて、実施例1と同一構成の平ベルトを作製し、これを実施例10とした。このゴム組成物の原料ゴムは、EPDMの平均エチレン含量が70質量%であった。
ベルト本体ゴム層を形成するゴム組成物を、EPM90質量%及びEPDM(2)10質量%の割合で混練したものを原料ゴムとしたことを除いて、実施例1と同一構成の平ベルトを作製し、これを実施例11とした。このゴム組成物の原料ゴムは、EPDMの平均エチレン含量が70質量%であった。
ベルト本体ゴム層を形成するゴム組成物を、EPM95質量%及びEPDM(2)5質量%の割合で混練したものを原料ゴムとしたことを除いて、実施例1と同一構成の平ベルトを作製し、これを実施例12とした。このゴム組成物の原料ゴムは、EPDMの平均エチレン含量が70質量%であった。
ベルト本体ゴム層を形成するゴム組成物を、EPM95質量%及びEPDM(3)5質量%の割合で混練したものを原料ゴムとしたことを除いて、実施例1と同一構成の平ベルトを作製し、これを実施例13とした。このゴム組成物の原料ゴムは、EPDMの平均エチレン含量が85質量%であった。
ベルト本体ゴム層を形成するゴム組成物を、EPM95質量%及びEBM5質量%の割合で混練したものを原料ゴムとしたことを除いて、実施例1と同一構成の平ベルトを作製し、これを実施例14とした。
ベルト本体ゴム層を形成するゴム組成物を、EPM95質量%及びEOM5質量%の割合で混練したものを原料ゴムとしたことを除いて、実施例1と同一構成の平ベルトを作製し、これを実施例15とした。
ベルト本体ゴム層を形成するゴム組成物の共架橋剤の配合量を70質量部としたことを除いて実施例8と同一構成の平ベルトを作製し、これを実施例16とした。このゴム組成物は、ジメタクリル酸亜鉛の含有量が49質量部であった。
ベルト本体ゴム層を形成するゴム組成物の共架橋剤の配合量を142.9質量部としたことを除いて実施例8と同一構成の平ベルトを作製し、これを実施例17とした。このゴム組成物は、ジメタクリル酸亜鉛の含有量が100質量部であった。
ベルト本体ゴム層を形成するゴム組成物にさらにH-NBR(日本ゼオン社製、商品名:Zetpol2020)を8質量部配合したことを除いて実施例16と同一構成の平ベルトを作製し、これを実施例18とした。
ベルト本体ゴム層を形成するゴム組成物に、ジメタクリル酸亜鉛を含有する共架橋剤の代わりにジアクリル酸亜鉛(川口化学工業社製、商品名:アクターZA)を32.2質量部配合したことを除いて実施例6と同一構成の平ベルトを作製し、これを実施例19とした。
ベルト本体ゴム層を形成するゴム組成物に、ジメタクリル酸亜鉛を含有する共架橋剤の代わりにジメタクリル酸マグネシウム(精工化学社製、商品名:ハイクロスGT)を32.2質量部配合したことを除いて実施例6と同一構成の平ベルトを作製し、これを実施例20とした。
ベルト本体ゴム層を形成するゴム組成物を、EPDM(2)を原料ゴムとしたことを除いて実施例1と同一構成の平ベルトを作製し、これを比較例1とした。このゴム組成物の原料ゴムは、EPDMの平均エチレン含量が70質量%であった。
ベルト本体ゴム層を形成するゴム組成物を、EPDM(1)50質量%及びEPDM(2)50質量%の割合で混練したものを原料ゴムとしたことを除いて、実施例1と同一構成の平ベルトを作製し、これを比較例2とした。このゴム組成物の原料ゴムは、EPDMの平均エチレン含量が66質量%であった。
ベルト本体ゴム層を形成するゴム組成物を、EPM50質量%及びEPDM(2)50質量%の割合で混練したものを原料ゴムとしたことを除いて、実施例1と同一構成の平ベルトを作製し、これを比較例3とした。このゴム組成物の原料ゴムは、EPDMの平均エチレン含量が70質量%であった。
ベルト本体ゴム層を形成するゴム組成物を、EPDM(1)を原料ゴムとしたことを除いて実施例1と同一構成の平ベルトを作製し、これを比較例4とした。このゴム組成物の原料ゴムは、EPDMの平均エチレン含量が62質量%であった。
ベルト本体ゴム層を形成するゴム組成物を、EPMを原料ゴムとしたことを除いて実施例1と同一構成の平ベルトを作製し、これを比較例5とした。
ベルト本体ゴム層を形成するゴム組成物の共架橋剤の配合量を44質量部としたことを除いて実施例8と同一構成の平ベルトを作製し、これを比較例6とした。このゴム組成物は、ジメタクリル酸亜鉛の含有量が30.8質量部であった。
ベルト本体ゴム層を形成するゴム組成物の共架橋剤の配合量を150質量部としたことを除いて実施例8と同一構成の平ベルトを作製し、これを比較例7とした。このゴム組成物は、ジメタクリル酸亜鉛の含有量が105質量部であった。
ベルト本体ゴム層を形成するゴム組成物のH-NBRの配合量を15質量部としたことを除いて実施例18と同一構成の平ベルトを作製し、これを比較例8とした。
<耐熱走行試験>
図3は、耐熱走行試験に用いたベルト走行試験機30のプーリレイアウトを示す。なお、このベルト走行試験機30は、後述の耐寒走行試験においても使用されるものである。
図4は、摩擦係数測定装置40を示す。この摩擦係数測定装置40は、プーリ径60mmの平プーリ42とその側方に設けられたロードセル41とからなる。平プーリ42は、鉄系の材料S45Cで構成されている。なお、後述の試験片は、ロードセル41から平プーリ42に向かって水平に延びた後に平プーリ42に巻き掛けられる、つまり、平プーリ42への巻き付け角度が90°となるように設けられている。
ベルト走行試験機30に実施例1~18及び比較例1~8の平ベルト(ベルト幅10mm)のそれぞれを巻き掛けた。そして、小径平プーリ33に側方に98Nのデッドウェイトを付与し、雰囲気温度-45℃の下で耐寒走行試験を行った。耐寒走行試験では、5秒間走行させて2秒間走行停止させる計7秒間を1サイクルとして、ベルトのゴム表面にクラックが発生するまでこのサイクルをくり返し行った。なお、1000サイクルくり返した時点でベルト走行を打ち切った。
評価試験の結果を、表5~7に示す。
11 ベルト本体ゴム層
12 心線
Claims (4)
- エチレン含量が66~85質量%のエチレンプロピレンジエンモノマーゴム、エチレンブテンコポリマー、及びエチレンオクテンコポリマーの少なくとも1種類を合計で5質量%以上40質量%未満含むエチレン-α-オレフィンエラストマー100質量部に対し、α,β-不飽和カルボン酸金属塩32~100質量部が配合され、エチレン-α-オレフィンエラストマー以外のエラストマーが配合されていない又は10質量部未満が配合された伝動ベルト用ゴム組成物。
- 請求項1に記載された伝動ベルト用ゴム組成物において、
上記エチレン-α-オレフィンエラストマーに含まれるエチレンプロピレンジエンモノマーゴムの平均エチレン含量が66~85質量%である伝動ベルト用ゴム組成物。 - 請求項1又は2に記載された伝動ベルト用ゴム組成物において、
上記エチレン-α-オレフィンエラストマーはエチレンプロピレンゴムを5~95質量%含むことを特徴とする伝動ベルト用ゴム組成物。 - 請求項1~3のいずれかに記載された伝動ベルト用ゴム組成物でプーリ接触部分が形成された伝動ベルト。
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WO2023282119A1 (ja) * | 2021-07-07 | 2023-01-12 | バンドー化学株式会社 | 架橋ゴム組成物及びそれを用いた摩擦伝動ベルト |
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JP6078702B1 (ja) * | 2015-12-04 | 2017-02-08 | バンドー化学株式会社 | Vリブドベルト |
CN108368914A (zh) * | 2015-12-04 | 2018-08-03 | 阪东化学株式会社 | 多楔带 |
WO2017094213A1 (ja) * | 2015-12-04 | 2017-06-08 | バンドー化学株式会社 | Vリブドベルト |
CN108368914B (zh) * | 2015-12-04 | 2018-12-18 | 阪东化学株式会社 | 多楔带 |
US10274045B2 (en) | 2015-12-04 | 2019-04-30 | Bando Chemical Industries, Ltd. | V-ribbed belt |
WO2018155722A1 (ja) | 2017-02-27 | 2018-08-30 | 三ツ星ベルト株式会社 | 伝動ベルト |
WO2020122054A1 (ja) * | 2018-12-11 | 2020-06-18 | バンドー化学株式会社 | 架橋ゴム組成物及びそれを用いたゴム製品 |
JPWO2020122054A1 (ja) * | 2018-12-11 | 2021-10-28 | バンドー化学株式会社 | 架橋ゴム組成物及びそれを用いたゴム製品 |
JP7365361B2 (ja) | 2018-12-11 | 2023-10-19 | バンドー化学株式会社 | 架橋ゴム組成物及びそれを用いたゴム製品 |
WO2022075368A1 (ja) * | 2020-10-08 | 2022-04-14 | 住友化学株式会社 | ゴム組成物、及び成形体 |
WO2023282119A1 (ja) * | 2021-07-07 | 2023-01-12 | バンドー化学株式会社 | 架橋ゴム組成物及びそれを用いた摩擦伝動ベルト |
JP7219369B1 (ja) * | 2021-07-07 | 2023-02-07 | バンドー化学株式会社 | 架橋ゴム組成物及びそれを用いた摩擦伝動ベルト |
CN116348542A (zh) * | 2021-07-07 | 2023-06-27 | 阪东化学株式会社 | 交联橡胶组合物及使用该交联橡胶组合物的摩擦传动带 |
CN116348542B (zh) * | 2021-07-07 | 2023-12-15 | 阪东化学株式会社 | 交联橡胶组合物及使用该交联橡胶组合物的摩擦传动带 |
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