WO2016031112A1 - Transmission belt and manufacturing method therefor - Google Patents

Transmission belt and manufacturing method therefor Download PDF

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Publication number
WO2016031112A1
WO2016031112A1 PCT/JP2015/003192 JP2015003192W WO2016031112A1 WO 2016031112 A1 WO2016031112 A1 WO 2016031112A1 JP 2015003192 W JP2015003192 W JP 2015003192W WO 2016031112 A1 WO2016031112 A1 WO 2016031112A1
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WO
WIPO (PCT)
Prior art keywords
transmission belt
hollow particles
foaming agent
rubber
power transmission
Prior art date
Application number
PCT/JP2015/003192
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French (fr)
Japanese (ja)
Inventor
張　偉
貴幸 大久保
松川　浩和
Original Assignee
バンドー化学株式会社
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Application filed by バンドー化学株式会社 filed Critical バンドー化学株式会社
Priority to JP2016544911A priority Critical patent/JP6546595B2/en
Publication of WO2016031112A1 publication Critical patent/WO2016031112A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D29/00—Producing belts or bands
    • 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
    • F16G1/28—Driving-belts with a contact surface of special shape, e.g. toothed
    • 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
    • F16G5/00—V-belts, i.e. belts of tapered cross-section
    • F16G5/20—V-belts, i.e. belts of tapered cross-section with a contact surface of special shape, e.g. toothed

Definitions

  • the present invention relates to a transmission belt and a manufacturing method thereof.
  • Patent Document 1 discloses an uncrosslinked rubber composition in which a surface layer on the side of forming a V rib of a V-ribbed belt is blended with hollow particles and / or a foaming agent for forming a concave hole on the surface of the V rib. Is composed of a rubber composition crosslinked by heating and pressing.
  • an uncrosslinked rubber composition in which a rubber component is blended with unexpanded hollow particles and a thermally decomposable foaming agent is heated and pressurized and crosslinked to form a plurality of recesses formed by expanding the hollow particles.
  • a method for producing a transmission belt in which a pulley contact portion is constituted by a rubber composition having holes exposed on the surface, wherein the decomposition temperature of the pyrolytic foaming agent is higher than the expansion start temperature of the hollow particles.
  • an uncrosslinked rubber composition in which a rubber component is blended with unexpanded hollow particles and a thermally decomposable foaming agent is heated and pressurized and crosslinked to form a plurality of recesses formed by expanding the hollow particles.
  • a transmission belt having a pulley contact portion made of a rubber composition with holes exposed on the surface, wherein an average pore diameter of the plurality of concave holes due to the hollow particles is 70 to 120 ⁇ m, and The hole diameter difference between the concave holes is 50 ⁇ m or less.
  • FIG. 3 is a perspective view of a V-ribbed belt according to Embodiment 1.
  • FIG. It is a cross-sectional enlarged view of a surface rubber layer. It is a longitudinal cross-sectional view of a belt forming die. It is a longitudinal cross-sectional enlarged view of a part of belt forming die.
  • FIG. 6 It is a figure which shows the pulley layout of the auxiliary machine drive belt transmission of a motor vehicle.
  • 6 is a perspective view of a V-ribbed belt according to Embodiment 2.
  • FIG. It is a figure which shows the pulley layout of the belt running test machine for abnormal noise evaluation at the time of flooding.
  • FIG. 1 shows a V-ribbed belt B (power transmission belt) according to the first embodiment.
  • the V-ribbed belt B according to the first embodiment is used, for example, in an auxiliary machine drive belt transmission provided in an engine room of an automobile.
  • the V-ribbed belt B according to Embodiment 1 has, for example, a belt circumferential length of 700 to 3000 mm, a belt width of 10 to 36 mm, and a belt thickness of 4.0 to 5.0 mm.
  • the V-ribbed belt B according to Embodiment 1 includes a V-ribbed belt main body 10 configured in a triple layer of a compression rubber layer 11 on the belt inner peripheral side, an intermediate adhesive rubber layer 12 and a back rubber layer 13 on the belt outer peripheral side.
  • a core wire 14 is embedded in the adhesive rubber layer 12 of the V-ribbed belt body 10 so as to form a spiral having a pitch in the belt width direction.
  • the compression rubber layer 11 is provided so that a plurality of V ribs 15 hang down to the inner peripheral side of the belt.
  • the plurality of V ribs 15 are each formed in a ridge having a substantially inverted triangular cross section extending in the belt length direction, and arranged in parallel in the belt width direction.
  • Each V-rib 15 has, for example, a rib height of 2.0 to 3.0 mm and a width between rib base ends of 1.0 to 3.6 mm.
  • the number of ribs is 3 to 6, for example (the number of ribs is 6 in FIG. 1).
  • the compression rubber layer 11 has a surface rubber layer 11a (pulley contact portion) provided in a layered manner along the entire pulley contact surface and an internal rubber layer 11b provided on the inner side of the belt with respect to the surface rubber layer 11a. .
  • the thickness of the surface rubber layer 11a is, for example, 50 to 500 ⁇ m.
  • the surface rubber layer 11a is a rubber composition obtained by heating and pressurizing and cross-linking an uncrosslinked rubber composition obtained by mixing and kneading a rubber compounding component containing unexpanded hollow particles and a pyrolytic foaming agent in a rubber component. Accordingly, a large number of hollow portions 16 having shells therein are formed, and the surface is constituted by a rubber composition in which a large number of concave holes 17 having shells are formed on the pulley contact surface.
  • the hollow portion 16 having the shell is formed by the expansion of the hollow particles, and the concave hole 17 having the shell is formed by opening the expanded hollow particles by breaking the shell on the surface. .
  • the decomposition temperature of a thermal decomposition type foaming agent is higher than the expansion
  • the surface rubber layer 11a composed of a rubber composition in which a non-crosslinked rubber composition in which a rubber component is blended with unexpanded hollow particles and a pyrolytic foaming agent is heated and pressurized, the hollow particles are formed. Since the decomposition temperature of the pyrolytic foaming agent is higher than the expansion start temperature of the surface, the average pore diameter due to the hollow particles is large on the surface of the surface rubber layer 11a as shown in FIG. Thus, a small concave hole 17 is formed.
  • the expansion start temperature is a temperature at which the unexpanded hollow particles start expanding at normal pressure (1 atm).
  • the decomposition temperature is a temperature at which the pyrolytic foaming agent starts to decompose at normal pressure (1 atm).
  • V-ribbed belts that run in the engine room to suppress the generation of slip noise when the belts are run under wet conditions. It has been.
  • a large number of concave holes 17 having a large average pore diameter due to the hollow particles are formed on the surface of the surface rubber layer 11a of the compressed rubber layer 11. Therefore, even when the belt travels in a wet condition, the water film on the pulley surface can be efficiently destroyed by the concave hole 17, thereby effectively suppressing the occurrence of slip noise.
  • Examples of the rubber component of the rubber composition constituting the surface rubber layer 11a include ethylene-propylene copolymer (EPR), ethylene-propylene-diene terpolymer (EPDM), ethylene-octene copolymer, ethylene-butene copolymer, and other ethylene- Examples include ⁇ -olefin elastomers; chloroprene rubber (CR); chlorosulfonated polyethylene rubber (CSM); hydrogenated acrylonitrile rubber (H-NBR). As the rubber component, one or more of these are preferably used, and an ethylene- ⁇ -olefin elastomer is more preferably used.
  • EPR ethylene-propylene copolymer
  • EPDM ethylene-propylene-diene terpolymer
  • ethylene-octene copolymer ethylene-butene copolymer
  • other ethylene- Examples include ⁇ -olefin elastomers; chloroprene rubber (CR); chloro
  • the rubber composition constituting the surface rubber layer 11a is formed by crosslinking an uncrosslinked rubber composition in which unexpanded hollow particles and a pyrolytic foaming agent are blended in a rubber component.
  • the particles include particles in which a solvent is enclosed in a shell formed of a thermoplastic polymer (for example, acrylonitrile-based polymer).
  • the hollow particles may be either a single species or a plurality of species.
  • the particle diameter of the unexpanded hollow particles is preferably 15 ⁇ m or more from the viewpoint of forming the concave holes 17 having a large average pore diameter due to the hollow particles suitable for suppressing the generation of abnormal noise due to slippage when wet on the surface of the surface rubber layer 11a.
  • the expansion start temperature of the hollow particles is preferably 140 ° C. or higher, from the viewpoint of forming the concave holes 17 having a large average pore diameter due to the hollow particles suitable for suppressing the generation of abnormal noise due to slippage at the time of water on the surface of the surface rubber layer 11a. More preferably, it is 150 degreeC or more, Preferably it is 180 degreeC or less, More preferably, it is 170 degreeC or less.
  • the amount of the hollow particles to be blended is 100 parts by mass of the rubber component. And preferably 0.5 parts by mass or more, more preferably 1.0 parts by mass or more, and preferably 10 parts by mass or less, more preferably 5.0 parts by mass or less.
  • Examples of commercially available hollow particles include Sekisui Chemical Co., Ltd. trade name: ADVANCEL EM403 (particle size 26 to 34 ⁇ m, expansion start temperature: 150 to 170 ° C.).
  • the rubber composition that constitutes the surface rubber layer 11a has a large number of hollow portions 16 formed by hollow particles expanded inside, and a large number of concave holes 17 that are opened by breaking the shell of the hollow particles on the surface. ing.
  • the average hole diameter of the concave holes 17 is preferably not less than 70 ⁇ m, more preferably not less than 80 ⁇ m, and more preferably not more than 120 ⁇ m, more preferably from the viewpoint that it is suitable for suppressing the generation of abnormal noise due to slippage when wet. Is 110 ⁇ m or less.
  • the difference between the maximum value and the minimum value of the hole diameter of the concave hole 17, that is, the hole diameter difference is an indicator of the variation in the hole diameter of the concave hole 17, but is preferably 50 ⁇ m or less, more preferably 40 ⁇ m or less.
  • the hole diameter of the concave hole 17 is an opening diameter of the concave hole 17 exposed on the surface of the surface rubber layer 11a
  • the average hole diameter is the number of arbitrary 50 to 100 hole diameters measured from the surface image.
  • the pore diameter difference can be obtained as an average, and the pore diameter difference can be obtained as a difference between the maximum value and the minimum value of arbitrary 50 to 100 pore diameters measured from the surface image.
  • thermally decomposable foaming agent blended in the uncrosslinked rubber composition examples include, for example, an ADCA foaming agent mainly composed of azodicarbonamide, a DPT foaming agent mainly composed of dinitrosopentamethylenetetramine, p, p
  • organic foaming agents such as an OBSH foaming agent mainly composed of '-oxybisbenzenesulfonylhydrazide and an HDCA foaming agent mainly composed of hydrazodicarbonamide.
  • these pyrolytic foaming agents are preferably used, and ADCA foaming agents are more preferably used.
  • the Sankyo Kasei Co., Ltd. brand name: Cell microphone series etc. are mentioned, for example.
  • the decomposition temperature of the pyrolytic foaming agent is higher than the expansion start temperature of the hollow particles, specifically, the average of the hollow particles suitable for suppressing the generation of abnormal noise due to slip on the surface of the surface rubber layer 11a.
  • the concave hole 17 having a large hole diameter it is preferably 150 ° C. or higher, more preferably 160 ° C. or higher, and preferably 230 ° C. or lower, more preferably 210 ° C. or lower.
  • the temperature difference between the expansion start temperature of the hollow particles and the decomposition temperature of the thermal decomposition type foaming agent forms a concave hole 17 having a large average hole diameter suitable for suppressing the generation of abnormal noise due to slippage when the water is wet on the surface of the surface rubber layer 11a.
  • it is preferably 10 ° C. or higher, more preferably 20 ° C. or higher, still more preferably 35 ° C. or higher, and preferably 80 ° C. or lower, more preferably 60 ° C. or lower.
  • the compounding amount of the pyrolytic foaming agent is 100 masses of the rubber component from the viewpoint of forming the concave holes 17 having a large average pore diameter due to the hollow particles suitable for suppressing the generation of abnormal noise due to slippage at the time of water on the surface of the surface rubber layer 11a.
  • the amount is preferably 0.5 parts by mass or more, more preferably 4 parts by mass or more, and preferably 10 parts by mass or less, more preferably 7 parts by mass or less.
  • the blending amount of the pyrolytic foaming agent with respect to 100 parts by weight of the rubber component is preferably larger than the blending amount of unexpanded hollow particles with respect to 100 parts by weight of the rubber component.
  • Mass ratio of blended amount of unexpanded hollow particles to 100 parts by weight of rubber component of rubber component of pyrolytic foaming agent to blended amount of 100 parts by weight of rubber component is from the viewpoint of forming the concave holes 17 having a large average pore diameter due to the hollow particles suitable for suppressing the generation of abnormal noise due to slippage at the time of water on the surface rubber layer 11a.
  • the rubber composition constituting the surface rubber layer 11a has a large number of hollow portions 18 that do not have a shell formed therein by foaming of a pyrolytic foaming agent, and a large number that does not have a shell formed on the surface.
  • the recessed hole 19 is exposed.
  • the difference between the maximum value and the minimum value of the hole diameter of the concave hole 19, that is, the hole diameter difference is larger than the hole diameter difference of the concave hole 17 formed by the hollow particles, and therefore, the variation in the hole diameter is large.
  • the hole diameter of the concave hole 19 having no shell is the opening diameter exposed on the surface of the surface rubber layer 11a.
  • the rubber composition constituting the surface rubber layer 11a includes a decomposition residue after the thermal decomposition type foaming agent is decomposed and foamed.
  • a decomposition residue after the thermal decomposition type foaming agent is decomposed and foamed.
  • urazole biurea cyanurate is included as a decomposition residue in the rubber composition constituting the surface rubber layer 11a.
  • hexamethylenetetramine is contained as a decomposition residue in the rubber composition constituting the surface rubber layer 11a.
  • the rubber composition constituting the surface rubber layer 11a contains polydithiophenyl ether and polythiophenylbenzenesulfonyl ether as decomposition residues.
  • the rubber composition constituting the surface rubber layer 11a contains urazole as a decomposition residue.
  • Examples of other rubber compounding agents blended in the rubber composition constituting the surface rubber layer 11a include reinforcing materials such as carbon black, oil, processing aids, vulcanization aids, crosslinking agents, vulcanization accelerators, and the like. Is mentioned. Short fibers may be blended in the rubber composition constituting the surface rubber layer 11a.
  • the rubber composition constituting the surface rubber layer 11a may be a sulfur-crosslinked rubber composition in which sulfur is used as a crosslinking agent, or an organic peroxide crosslinked system in which an organic peroxide is used as a crosslinking agent. Either a rubber composition or a combined cross-linked rubber composition using them in combination may be used.
  • the inner rubber layer 11b is composed of a rubber composition in which an uncrosslinked rubber composition obtained by mixing and kneading a rubber compounding agent with a rubber component is heated and pressurized and crosslinked.
  • the rubber component of the rubber composition constituting the inner rubber layer 11b for example, an ethylene- ⁇ -olefin elastomer and the like can be cited as in the case of the surface rubber layer 11a.
  • the rubber component of the rubber composition constituting the inner rubber layer 11b is preferably the same as the rubber component of the rubber composition constituting the surface rubber layer 11a.
  • a rubber compounding agent compounded in the rubber composition constituting the internal rubber layer 11b for example, as in the case of the surface rubber layer 11a, for example, a reinforcing material such as carbon black, a softening agent, a processing aid, a vulcanizing aid, Examples thereof include a crosslinking agent, a vulcanization accelerator, a rubber compounding resin, and an antioxidant.
  • the uncrosslinked rubber composition before crosslinking of the rubber composition constituting the inner rubber layer 11b is preferably not blended with unexpanded hollow particles and a pyrolytic foaming agent. That is, the rubber composition constituting the inner rubber layer 11b is preferably solid.
  • the rubber composition constituting the inner rubber layer 11b may be a sulfur-crosslinked rubber composition in which sulfur is used as a crosslinking agent, or an organic peroxide crosslinked system in which an organic peroxide is used as a crosslinking agent. Either a rubber composition or a combined cross-linked rubber composition using them in combination may be used.
  • the cross-linking system of the inner rubber layer 11b may be the same as or different from the cross-linking system of the surface rubber layer 11a.
  • the adhesive rubber layer 12 is formed in a band shape having a horizontally long cross section and has a thickness of, for example, 1.0 to 2.5 mm.
  • the back rubber layer 13 is also formed in a band shape having a horizontally long cross section and has a thickness of, for example, 0.4 to 0.8 mm.
  • the surface of the back rubber layer 13 is preferably formed in a form in which the texture of the woven fabric is transferred from the viewpoint of suppressing the sound generated between the back rubber layer 13 and the flat pulley in contact with the belt back surface.
  • Each of the adhesive rubber layer 12 and the back rubber layer 13 is composed of a rubber composition obtained by heating and pressurizing and crosslinking a non-crosslinked rubber composition obtained by mixing a rubber compounding agent with a rubber component and kneading.
  • Examples of the rubber component of the rubber composition constituting the adhesive rubber layer 12 and the back rubber layer 13 include, for example, ethylene- ⁇ -olefin elastomers as in the case of the surface rubber layer 11a.
  • the rubber component of the rubber composition constituting the adhesive rubber layer 12 and the back rubber layer 13 is preferably the same as the rubber component of the rubber composition constituting the surface rubber layer 11a and / or the internal rubber layer 11b.
  • a rubber compounding agent compounded in the rubber composition constituting the adhesive rubber layer 12 and the back rubber layer 13 for example, a reinforcing material such as carbon black, a softening agent, a processing aid, as in the case of the surface rubber layer 11a
  • a reinforcing material such as carbon black, a softening agent, a processing aid, as in the case of the surface rubber layer 11a
  • examples include vulcanization aids, crosslinking agents, vulcanization accelerators, rubber compounding resins, anti-aging agents, and the like.
  • the uncrosslinked rubber composition before crosslinking of the rubber composition constituting the adhesive rubber layer 12 and the back rubber layer 13 is preferably not blended with unexpanded hollow particles and a pyrolytic foaming agent. That is, it is preferable that the rubber composition constituting the adhesive rubber layer 12 and the back rubber layer 13 is solid.
  • Short fibers may be blended in the rubber composition constituting the adhesive rubber layer 12 and the back rubber layer 13.
  • the rubber composition constituting the adhesive rubber layer 12 and the back rubber layer 13 may be a sulfur-crosslinked rubber composition in which sulfur is used as a crosslinking agent, or an organic material in which an organic peroxide is used as a crosslinking agent. Either a peroxide cross-linked rubber composition or a combined cross-linked rubber composition using them in combination may be used.
  • the crosslinking system of the adhesive rubber layer 12 and the back rubber layer 13 may be the same as or different from the crosslinking system of the surface rubber layer 11a and / or the internal rubber layer 11b.
  • the inner rubber layer 11b, the adhesive rubber layer 12, and the back rubber layer 13 of the compressed rubber layer 11 are formed of a rubber composition of a different composition or a rubber composition of the same composition, either will do.
  • the core wire 14 is composed of twisted yarns such as polyester fiber (PET), polyethylene naphthalate fiber (PEN), aramid fiber, vinylon fiber and the like.
  • PET polyester fiber
  • PEN polyethylene naphthalate fiber
  • aramid fiber vinylon fiber and the like.
  • the core 14 is subjected to an adhesive treatment that is heated after being immersed in an RFL aqueous solution before forming and / or an adhesive treatment that is dried after being immersed in rubber paste in order to impart adhesion to the V-ribbed belt body 10. It has been subjected.
  • a belt forming die 20 including a cylindrical inner die 21 and an outer die 22 provided concentrically is used.
  • the inner mold 21 is formed of a flexible material such as rubber.
  • the outer mold 22 is made of a rigid material such as metal.
  • the inner peripheral surface of the outer mold 22 is formed as a molding surface, and V rib forming grooves 23 are provided on the inner peripheral surface of the outer mold 22 at a constant pitch in the axial direction.
  • the outer mold 22 is provided with a temperature control mechanism that controls the temperature by circulating a heat medium such as water vapor or a coolant such as water.
  • the belt mold 20 is provided with a pressurizing means for pressurizing and expanding the inner mold 21 from the inside.
  • each rubber compounding agent is blended with the rubber component and kneaded by a kneader such as a kneader or a Banbury mixer, and the obtained uncrosslinked rubber composition is formed by calendar molding or the like.
  • the uncrosslinked rubber sheets 11a ′ and 11b ′ for the surface rubber layer and the internal rubber layer of the compressed rubber layer 11 are produced by forming into a sheet shape.
  • uncrosslinked rubber sheets 12 'and 13' for the adhesive rubber layer and the back rubber layer are also produced.
  • an adhesive treatment is performed in which the twisted wire 14 ′ for the core wire is immersed in an RFL aqueous solution and heated, and thereafter, an adhesive treatment is performed in which the strand 14 d is immersed in rubber paste and dried by heating.
  • the rubber component is blended with unexpanded hollow particles 16' and a pyrolytic foaming agent.
  • a rubber sleeve 25 is placed on a cylindrical drum 24 having a smooth surface, and an uncrosslinked rubber sheet 13 ′ for the back rubber layer and an uncrosslinked rubber sheet for the adhesive rubber layer are placed thereon. 12 ′ are wound in order and laminated, and then a strand 14 ′ for a core wire is spirally wound around the cylindrical inner mold 21, and further, an uncrosslinked rubber sheet 12 ′ for an adhesive rubber layer is further formed thereon.
  • the uncrosslinked rubber sheet 11b ′ for the inner rubber layer in the compressed rubber layer 11 and the uncrosslinked rubber sheet 11a ′ for the surface rubber layer are wound in order to form the laminate 10 ′.
  • the rubber sleeve 25 provided with the laminated body 10 ′ is removed from the cylindrical drum 24, and as shown in FIG. 6, it is set in an fitted state on the inner peripheral surface side of the outer mold 22.
  • the inner mold 21 is positioned and sealed in the rubber sleeve 25 set on the outer mold 22.
  • the outer mold 22 is heated, and high-pressure air or the like is injected into the sealed interior of the inner mold 21 to pressurize it.
  • the inner mold 21 expands, and the laminate 10 ′ is pressed against the molding surface of the outer mold 22.
  • the uncrosslinked rubber sheets 11a ', 11b', 12 ', and 13' are heated and pressurized and cross-linked and integrated, and a cylindrical belt slab S that is combined with the twisted yarn 14 'is molded.
  • the uncrosslinked rubber sheet 11a ′ for the surface rubber layer forms a large number of hollow portions 16 having shells inside due to expansion of the hollow particles 16 ′, and the shell of the hollow particles 16 ′ is broken on the surface.
  • the molding temperature of the belt slab S is, for example, 100 to 180 ° C.
  • the molding pressure is, for example, 0.5 to 2.0 MPa
  • the molding time is, for example, 10 to 60 minutes.
  • the surface of the surface rubber layer 11a constituting the pulley contact portion has a large average pore diameter due to the hollow particles and a small variation in the pore diameter.
  • a concave hole 17 is formed. This is because, since the decomposition temperature of the pyrolytic foaming agent is higher than the expansion start temperature of the hollow particle 16 ′, the hollow particle 16 ′ first expands, and then the pyrolytic foaming agent decomposes and foams. Therefore, it is considered that the foaming gas by the pyrolytic foaming agent is introduced into the expanded hollow particles 16 ′, and as a result, the expansion of any hollow particles 16 ′ is promoted.
  • the expansion of the hollow particles 16 ′ is restricted, and it is difficult to sufficiently expand the hollow particles 16 ′.
  • the expansion of the hollow particles 16 ′ is promoted by the decomposition and foaming of the pyrolytic foaming agent.
  • the hollow particles 16 ′ can be expanded sufficiently large even under. From this point of view, the effect of expansion promotion of the hollow particles 16 ′ can be remarkably obtained when the molding pressure is 0.7 MPa or more, particularly 0.9 MPa or more.
  • the foaming gas produced by the pyrolytic foaming agent is, for example, nitrogen for ADCA foaming agents, nitrogen, carbon monoxide and carbon dioxide for DPT foaming agents, nitrogen and water vapor for OBSH foaming agents, and HDCA foaming agents. Nitrogen and ammonia.
  • the inside of the inner mold 21 is decompressed to release the seal, the belt slab S molded between the inner mold 21 and the outer mold 22 is taken out via the rubber sleeve 25, and the belt slab S is cut into a predetermined width.
  • the V-ribbed belt B is obtained by turning the front and back. If necessary, the outer peripheral side of the belt slab S, that is, the surface on the V rib 15 side may be polished.
  • FIG. 9 shows a pulley layout of the auxiliary drive belt transmission device 30 for an automobile using the V-ribbed belt B according to the first embodiment.
  • This accessory drive belt transmission device 30 is of a serpentine drive type in which a V-ribbed belt B is wound around six pulleys, four rib pulleys and two flat pulleys, to transmit power.
  • the auxiliary drive belt transmission device 30 is provided with a power steering pulley 31 of a rib pulley at the uppermost position, and an AC generator pulley 32 of a rib pulley is provided below the power steering pulley 31.
  • a flat pulley tensioner pulley 33 is provided at the lower left of the power steering pulley 31, and a flat pulley water pump pulley 34 is provided below the tensioner pulley 33.
  • a ribshaft crankshaft pulley 35 is provided on the lower left side of the tensioner pulley 33, and a rib pulley air conditioner pulley 36 is provided on the lower right side of the crankshaft pulley 35.
  • These pulleys are made of, for example, a metal stamped product, a molded product such as a casting, nylon resin, or phenol resin, and have a pulley diameter of 50 to 150 mm.
  • the V-ribbed belt B is wound around the power steering pulley 31 so that the V-rib 15 side contacts, and then wound around the tensioner pulley 33 so that the back surface of the belt contacts. After that, it is wound around the crankshaft pulley 35 and the air conditioner pulley 36 in order so that the V rib 15 side comes into contact, and further wound around the water pump pulley 34 so that the back surface of the belt comes into contact. Thus, it is wound around the AC generator pulley 32 and finally returned to the power steering pulley 31.
  • the belt span length which is the length of the V-ribbed belt B spanned between the pulleys, is, for example, 50 to 300 mm. Misalignment that can occur between pulleys is 0-2 °.
  • FIG. 10 shows a V-ribbed belt B (power transmission belt) according to the second embodiment.
  • the part of the same name as Embodiment 1 is shown using the same code
  • FIG. 10 shows a V-ribbed belt B (power transmission belt) according to the second embodiment.
  • the part of the same name as Embodiment 1 is shown using the same code
  • the compressed rubber layer 11 is composed of the same rubber composition as the surface rubber layer 11a in the V-ribbed belt B according to the first embodiment. That is, the compressed rubber layer 11 is a rubber composition in which an uncrosslinked rubber composition obtained by mixing and kneading a rubber compounding agent containing unexpanded hollow particles and a pyrolytic foaming agent in a rubber component is heated and pressurized and crosslinked.
  • an uncrosslinked rubber sheet for the compressed rubber layer unexpanded hollow particles for the surface rubber layer in the V-ribbed belt B according to the first embodiment and pyrolytic foaming
  • An uncrosslinked rubber sheet similar to the uncrosslinked rubber sheet containing the agent may be used.
  • the V-ribbed belt B is shown as the friction transmission belt, but it is not particularly limited to this, and a low-edge type V-belt or the like may be used.
  • the V-ribbed belt main body 10 is configured by the compressed rubber layer 11, the adhesive rubber layer 12, and the back rubber layer 13.
  • the present invention is not particularly limited thereto, and the compressed rubber layer 11 is not limited thereto.
  • the V-ribbed belt main body 10 is constituted by the adhesive rubber layer 12, and is constituted by a woven fabric, a knitted fabric, a non-woven fabric or the like formed of, for example, cotton, polyamide fiber, polyester fiber, aramid fiber or the like instead of the back rubber layer 13. It may be provided with a reinforcing cloth.
  • the auxiliary drive belt transmission device 20 of an automobile is shown as a belt transmission device, the belt transmission device is not particularly limited to this, and may be a belt transmission device for general industries.
  • Rubber composition The uncrosslinked rubber compositions of Examples 1 to 3 and Comparative Examples 1 and 2 below were prepared. Each configuration is also shown in Table 1.
  • EPDM (trade name: EP22 manufactured by JSR) as a rubber component is put into a chamber of a closed Banbury mixer and masticated, and then carbon black (product manufactured by Tokai Carbon Co., Ltd.) is added to 100 parts by mass of the rubber component.
  • a master batch was prepared by charging and kneading 5 parts by mass of trade name: zinc oxide (3 types).
  • the master batch After cooling the master batch to room temperature, the master batch is put into a sealed banbury mixer chamber and kneaded again, and there is sulfur (100 parts by mass of rubber component) : Seimi OT) 1.7 parts by mass, vulcanization accelerator (trade name: MSA, manufactured by Ouchi Shinsei Chemical Co., Ltd.), hollow particles (trade name: Advancel EM403, expansion start temperature Ta: 150 by Sekisui Chemical Co., Ltd.) ⁇ 170 ° C) 2.3 parts by mass and thermal decomposition type foaming agent 1 (manufactured by Sankyo Kasei Co., Ltd., trade name: Cellmic CE, ADCA-based foaming agent, decomposition temperature Tb: 208 ° C) 6.9 parts by mass are charged and mixed.
  • the uncrosslinked rubber composition kneaded was released when the temperature in the chamber reached 110 ° C.
  • the uncrosslinked rubber composition was designated as Example 1.
  • Example 1 the temperature difference (Tb-Ta) between the expansion start temperature of the hollow particles and the decomposition temperature of the pyrolytic foaming agent 1 is 38 to 58 ° C., and the blending amount of the hollow particles having the blending amount of the pyrolytic foaming agent is used.
  • the mass ratio to the amount is 3.0.
  • Example 2 Except that the blending amounts of the hollow particles and the pyrolyzable foaming agent 1 were 1.2 parts by mass and 8.7 parts by mass, respectively, with respect to 100 parts by mass of the rubber component, the same composition as in Example 1 The crosslinked rubber composition was designated as Example 2.
  • the temperature difference (Tb-Ta) between the expansion start temperature of the hollow particles and the decomposition temperature of the pyrolytic foaming agent 1 is 38 to 58 ° C., and the blending amount of the hollow particles in the blending amount of the pyrolytic foaming agent is used.
  • the mass ratio to the quantity is 7.3.
  • Example 3 The blended amount of the hollow particles is 3.5 parts by mass with respect to 100 parts by mass of the rubber component, and instead of the pyrolyzable foaming agent 1, a pyrolyzable foaming agent 2 (trade name: Cellmic A DPT foaming manufactured by Sankyo Kasei Co., Ltd.) An uncrosslinked rubber composition having the same structure as Example 1 was used in Example 3, except that 4.1 parts by mass of the agent decomposition temperature Tb: 205 ° C. was added to 100 parts by mass of the rubber component.
  • Example 3 the temperature difference (Tb-Ta) between the expansion start temperature of the hollow particles and the decomposition temperature of the pyrolytic foaming agent 2 is 35 to 55 ° C., and the blending amount of the hollow particles in the blending amount of the pyrolytic foaming agent is used.
  • the mass ratio to the quantity is 1.2.
  • Example 1 An uncrosslinked rubber composition having the same configuration as that of Example 1 was compared except that the pyrolytic foaming agent 1 was not blended and the blended amount of the hollow particles was 10 parts by mass with respect to 100 parts by mass of the rubber component. It was set to 1.
  • Example 2 A non-crosslinked rubber composition having the same configuration as that of Example 1 was compared except that the hollow particles were not blended and the blending amount of the pyrolyzable foaming agent 1 was 10 parts by mass with respect to 100 parts by mass of the rubber component. 2.
  • Example 1 the surface morphology of the test piece was observed with a microscope (Model: VHX-2000, manufactured by Keyence Corporation) at a magnification of 200 times.
  • a concave hole having a shell made of hollow particles was observed.
  • Comparative Example 2 with respect to the concave holes that do not have a shell made of the pyrolytic foaming agent, arbitrary 100 hole diameters were measured, and the number average thereof was taken as the average hole diameter.
  • FIG. 11 shows a pulley layout of the belt running test machine 40 for evaluating abnormal noise when wet.
  • the belt running test machine 40 for evaluating abnormal noise when wet is provided with a drive pulley 41 that is a rib pulley having a pulley diameter of 140 mm, and a first driven pulley 42 that is a rib pulley having a pulley diameter of 75 mm is provided to the right of the drive pulley 41.
  • a second driven pulley 43 which is a rib pulley having a pulley diameter of 50 mm, is provided above the first driven pulley 42 and diagonally right above the driving pulley 41.
  • An idler pulley 44 which is a flat pulley having a pulley diameter of 75 mm, is provided in the middle.
  • the V-rib side of the V-ribbed belt B is in contact with the drive pulley 41, the first and second driven pulleys 42, 43, which are rib pulleys, and the back side is a flat pulley. It is configured to be wound around in contact with the idler pulley 44.
  • V-ribbed belts each having a compressed rubber layer formed of the uncrosslinked rubber compositions of Examples 1 to 3 and Comparative Examples 1 and 2 were manufactured.
  • the running test machine 40 position the pulley so that a belt tension of 49 N per rib is applied, give resistance to the second driven pulley 43 so that a current of 60 A flows to the alternator to which it is attached.
  • the drive pulley 41 was rotated at a rotation speed of 800 rpm, and water was dropped at a rate of 1000 ml per minute on the V rib side of the V ribbed belt B at the entry portion of the V ribbed belt B into the drive pulley 41.
  • production situation at the time of belt running was evaluated in four steps, large, small, minute, and nothing.
  • Table 1 shows the test results.
  • the average pore diameter of the hollow holes due to the hollow particles is relatively large as 92 ⁇ m, 109 ⁇ m, and 78 ⁇ m, whereas only the hollow particles are used.
  • the average pore diameter of the hollow holes by the hollow particles is 50 ⁇ m, which is smaller than the concave holes by the hollow particles of Examples 1 to 3.
  • Examples 1 to 3 have a higher noise suppressing effect during belt travel than Comparative Examples 1 and 2.
  • the present invention is useful for a transmission belt and a manufacturing method thereof.

Abstract

The present invention is a transmission belt manufacturing method in which a pulley contact portion is formed by a rubber composition on the surface of which a large number of recessed holes formed by expansion of hollow particles by heating, pressurizing, and crosslinking an uncrosslinked rubber composition formed by mixing the hollow particles not yet expanded and a thermally decomposable blowing agent into a rubber component are exposed. The decomposition temperature of the thermally decomposable blowing agent is higher than the expansion start temperature of the hollow particles.

Description

伝動ベルト及びその製造方法Transmission belt and manufacturing method thereof
　本発明は、伝動ベルト及びその製造方法に関する。 The present invention relates to a transmission belt and a manufacturing method thereof.
　ゴム成分に未膨張の中空粒子や熱分解型発泡剤を配合した未架橋ゴム組成物を加熱及び加圧すると共に架橋させることにより表面に多数の凹孔が形成されたゴム組成物を製造する技術が知られている。 Technology for producing a rubber composition having a large number of concave holes formed on the surface by heating and pressurizing and crosslinking an uncrosslinked rubber composition in which unexpanded hollow particles and a pyrolytic foaming agent are blended in a rubber component Are known.
　例えば、特許文献１には、ＶリブドベルトのＶリブを形成する側の表面層を、Ｖリブの表面に凹孔を形成するための中空粒子及び／又は発泡剤が配合された未架橋ゴム組成物を加熱及び加圧して架橋させたゴム組成物で構成することが開示されている。 For example, Patent Document 1 discloses an uncrosslinked rubber composition in which a surface layer on the side of forming a V rib of a V-ribbed belt is blended with hollow particles and / or a foaming agent for forming a concave hole on the surface of the V rib. Is composed of a rubber composition crosslinked by heating and pressing.
ＷＯ２０１２／１７２７１７Ａ１WO2012 / 172717A1
　本発明は、ゴム成分に未膨張の中空粒子と熱分解型発泡剤とを配合した未架橋ゴム組成物を加熱及び加圧すると共に架橋させることにより前記中空粒子が膨張して形成された多数の凹孔が表面に露出したゴム組成物でプーリ接触部分を構成する伝動ベルトの製造方法であって、前記中空粒子の膨張開始温度よりも前記熱分解型発泡剤の分解温度の方が高い。 In the present invention, an uncrosslinked rubber composition in which a rubber component is blended with unexpanded hollow particles and a thermally decomposable foaming agent is heated and pressurized and crosslinked to form a plurality of recesses formed by expanding the hollow particles. A method for producing a transmission belt in which a pulley contact portion is constituted by a rubber composition having holes exposed on the surface, wherein the decomposition temperature of the pyrolytic foaming agent is higher than the expansion start temperature of the hollow particles.
　本発明は、ゴム成分に未膨張の中空粒子と熱分解型発泡剤とを配合した未架橋ゴム組成物を加熱及び加圧すると共に架橋させることにより前記中空粒子が膨張して形成された多数の凹孔が表面に露出したゴム組成物でプーリ接触部分が構成された伝動ベルトであって、前記中空粒子による前記多数の凹孔の平均孔径が７０～１２０μｍであり、且つ前記中空粒子による前記多数の凹孔の孔径差が５０μｍ以下である。 In the present invention, an uncrosslinked rubber composition in which a rubber component is blended with unexpanded hollow particles and a thermally decomposable foaming agent is heated and pressurized and crosslinked to form a plurality of recesses formed by expanding the hollow particles. A transmission belt having a pulley contact portion made of a rubber composition with holes exposed on the surface, wherein an average pore diameter of the plurality of concave holes due to the hollow particles is 70 to 120 μm, and The hole diameter difference between the concave holes is 50 μm or less.
実施形態１に係るＶリブドベルトの斜視図である。3 is a perspective view of a V-ribbed belt according to Embodiment 1. FIG. 表面ゴム層の断面拡大図である。It is a cross-sectional enlarged view of a surface rubber layer. ベルト成形型の縦断面図である。It is a longitudinal cross-sectional view of a belt forming die. ベルト成形型の一部分の縦断面拡大図である。It is a longitudinal cross-sectional enlarged view of a part of belt forming die. 積層体を形成する工程を示す説明図である。It is explanatory drawing which shows the process of forming a laminated body. 積層体を外型にセットする工程を示す説明図である。It is explanatory drawing which shows the process of setting a laminated body to an outer type | mold. 外型を内型の外側に設ける工程を示す説明図である。It is explanatory drawing which shows the process of providing an outer type | mold on the outer side of an inner type | mold. ベルトスラブを成型する工程を示す説明図である。It is explanatory drawing which shows the process of shape | molding a belt slab. 自動車の補機駆動ベルト伝動装置のプーリレイアウトを示す図である。It is a figure which shows the pulley layout of the auxiliary machine drive belt transmission of a motor vehicle. 実施形態２に係るＶリブドベルトの斜視図である。6 is a perspective view of a V-ribbed belt according to Embodiment 2. FIG. 被水時異音評価用ベルト走行試験機のプーリレイアウトを示す図である。It is a figure which shows the pulley layout of the belt running test machine for abnormal noise evaluation at the time of flooding.
　以下、実施形態について図面に基づいて詳細に説明する。 Hereinafter, embodiments will be described in detail based on the drawings.
　（実施形態１）
　図１は、実施形態１に係るＶリブドベルトＢ（伝動ベルト）を示す。実施形態１に係るＶリブドベルトＢは、例えば、自動車のエンジンルーム内に設けられる補機駆動ベルト伝動装置等に用いられるものである。実施形態１に係るＶリブドベルトＢは、例えば、ベルト周長が７００～３０００ｍｍ、ベルト幅が１０～３６ｍｍ、及びベルト厚さが４．０～５．０ｍｍである。 (Embodiment 1)
FIG. 1 shows a V-ribbed belt B (power transmission belt) according to the first embodiment. The V-ribbed belt B according to the first embodiment is used, for example, in an auxiliary machine drive belt transmission provided in an engine room of an automobile. The V-ribbed belt B according to Embodiment 1 has, for example, a belt circumferential length of 700 to 3000 mm, a belt width of 10 to 36 mm, and a belt thickness of 4.0 to 5.0 mm.
　実施形態１に係るＶリブドベルトＢは、ベルト内周側の圧縮ゴム層１１と中間の接着ゴム層１２とベルト外周側の背面ゴム層１３との三重層に構成されたＶリブドベルト本体１０を備える。Ｖリブドベルト本体１０の接着ゴム層１２には、ベルト幅方向にピッチを有する螺旋を形成するように配された心線１４が埋設されている。 The V-ribbed belt B according to Embodiment 1 includes a V-ribbed belt main body 10 configured in a triple layer of a compression rubber layer 11 on the belt inner peripheral side, an intermediate adhesive rubber layer 12 and a back rubber layer 13 on the belt outer peripheral side. A core wire 14 is embedded in the adhesive rubber layer 12 of the V-ribbed belt body 10 so as to form a spiral having a pitch in the belt width direction.
　圧縮ゴム層１１は、複数のＶリブ１５がベルト内周側に垂下するように設けられている。複数のＶリブ１５は、各々がベルト長さ方向に延びる断面略逆三角形の突条に形成されていると共に、ベルト幅方向に並設されている。各Ｖリブ１５は、例えば、リブ高さが２．０～３．０ｍｍ、リブ基端間の幅が１．０～３．６ｍｍである。リブ数は例えば３～６個である（図１ではリブ数が６）。 The compression rubber layer 11 is provided so that a plurality of V ribs 15 hang down to the inner peripheral side of the belt. The plurality of V ribs 15 are each formed in a ridge having a substantially inverted triangular cross section extending in the belt length direction, and arranged in parallel in the belt width direction. Each V-rib 15 has, for example, a rib height of 2.0 to 3.0 mm and a width between rib base ends of 1.0 to 3.6 mm. The number of ribs is 3 to 6, for example (the number of ribs is 6 in FIG. 1).
　圧縮ゴム層１１は、プーリ接触表面全体に沿うように層状に設けられた表面ゴム層１１ａ（プーリ接触部分）とその表面ゴム層１１ａよりもベルト内部側に設けられた内部ゴム層１１ｂとを有する。表面ゴム層１１ａの厚さは例えば５０～５００μｍである。 The compression rubber layer 11 has a surface rubber layer 11a (pulley contact portion) provided in a layered manner along the entire pulley contact surface and an internal rubber layer 11b provided on the inner side of the belt with respect to the surface rubber layer 11a. . The thickness of the surface rubber layer 11a is, for example, 50 to 500 μm.
　表面ゴム層１１ａは、ゴム成分に未膨張の中空粒子と熱分解型発泡剤とを含むゴム配合剤を配合して混練した未架橋ゴム組成物を加熱及び加圧すると共に架橋させたゴム組成物であって、それにより内部にシェルを有する多数の中空部１６が形成され且つ表面、つまり、プーリ接触表面にシェルを有する多数の凹孔１７が形成されたゴム組成物で構成されている。このシェルを有する中空部１６は中空粒子の膨張により形成されたものであり、また、シェルを有する凹孔１７は膨張した中空粒子が表面においてシェルが破れて開口することにより形成されたものである。そして、未架橋ゴム組成物に配合された中空粒子の膨張開始温度よりも、熱分解型発泡剤の分解温度の方が高い。このようにゴム成分に未膨張の中空粒子と熱分解型発泡剤とを配合した未架橋ゴム組成物を加熱及び加圧すると共に架橋させたゴム組成物で構成された表面ゴム層１１ａでは、中空粒子の膨張開始温度よりも熱分解型発泡剤の分解温度の方が高いことにより、図２に示すように、表面ゴム層１１ａの表面に、中空粒子による、平均孔径が大きく、しかも、孔径のばらつきが小さい凹孔１７が形成されることとなる。ここで、膨張開始温度とは、常圧（１気圧）において未膨張の中空粒子が膨張を開始する温度である。分解温度とは、常圧（１気圧）において熱分解型発泡剤が分解を開始する温度である。 The surface rubber layer 11a is a rubber composition obtained by heating and pressurizing and cross-linking an uncrosslinked rubber composition obtained by mixing and kneading a rubber compounding component containing unexpanded hollow particles and a pyrolytic foaming agent in a rubber component. Accordingly, a large number of hollow portions 16 having shells therein are formed, and the surface is constituted by a rubber composition in which a large number of concave holes 17 having shells are formed on the pulley contact surface. The hollow portion 16 having the shell is formed by the expansion of the hollow particles, and the concave hole 17 having the shell is formed by opening the expanded hollow particles by breaking the shell on the surface. . And the decomposition temperature of a thermal decomposition type foaming agent is higher than the expansion | swelling start temperature of the hollow particle mix | blended with the uncrosslinked rubber composition. In the surface rubber layer 11a composed of a rubber composition in which a non-crosslinked rubber composition in which a rubber component is blended with unexpanded hollow particles and a pyrolytic foaming agent is heated and pressurized, the hollow particles are formed. Since the decomposition temperature of the pyrolytic foaming agent is higher than the expansion start temperature of the surface, the average pore diameter due to the hollow particles is large on the surface of the surface rubber layer 11a as shown in FIG. Thus, a small concave hole 17 is formed. Here, the expansion start temperature is a temperature at which the unexpanded hollow particles start expanding at normal pressure (1 atm). The decomposition temperature is a temperature at which the pyrolytic foaming agent starts to decompose at normal pressure (1 atm).
　自動車の走行中における静音性に対するニーズが高まっているが、かかるニーズから、エンジンルーム内で走行するＶリブドベルトに対しては、被水状態でベルト走行した際のスリップ異音の発生の抑制が求められている。かかる要求に対し、実施形態１に係るＶリブドベルトＢによれば、上記の通り、圧縮ゴム層１１の表面ゴム層１１ａの表面に中空粒子による平均孔径が大きい多数の凹孔１７が形成されているので、被水状態でベルト走行した際でも、凹孔１７によりプーリ表面の水膜を効率的に破壊し、それによってスリップ異音の発生を効果的に抑制することができる。 There is an increasing need for quietness during driving of automobiles. However, for these needs, it is necessary for V-ribbed belts that run in the engine room to suppress the generation of slip noise when the belts are run under wet conditions. It has been. In response to such a request, according to the V-ribbed belt B according to the first embodiment, as described above, a large number of concave holes 17 having a large average pore diameter due to the hollow particles are formed on the surface of the surface rubber layer 11a of the compressed rubber layer 11. Therefore, even when the belt travels in a wet condition, the water film on the pulley surface can be efficiently destroyed by the concave hole 17, thereby effectively suppressing the occurrence of slip noise.
　表面ゴム層１１ａを構成するゴム組成物のゴム成分としては、例えば、エチレン・プロピレンコポリマー（ＥＰＲ）、エチレン・プロピレン・ジエンターポリマー（ＥＰＤＭ）、エチレン・オクテンコポリマー、エチレン・ブテンコポリマーなどのエチレン－α－オレフィンエラストマー；クロロプレンゴム（ＣＲ）；クロロスルホン化ポリエチレンゴム（ＣＳＭ）；水素添加アクリロニトリルゴム（Ｈ－ＮＢＲ）等が挙げられる。ゴム成分は、これらのうちの１種又は２種以上を用いることが好ましく、エチレン－α－オレフィンエラストマーを用いることがより好ましい。 Examples of the rubber component of the rubber composition constituting the surface rubber layer 11a include ethylene-propylene copolymer (EPR), ethylene-propylene-diene terpolymer (EPDM), ethylene-octene copolymer, ethylene-butene copolymer, and other ethylene- Examples include α-olefin elastomers; chloroprene rubber (CR); chlorosulfonated polyethylene rubber (CSM); hydrogenated acrylonitrile rubber (H-NBR). As the rubber component, one or more of these are preferably used, and an ethylene-α-olefin elastomer is more preferably used.
　表面ゴム層１１ａを構成するゴム組成物は、ゴム成分に未膨張の中空粒子と熱分解型発泡剤とが配合された未架橋ゴム組成物が架橋して形成されるが、その未膨張の中空粒子としては、例えば、熱可塑性ポリマー（例えばアクリロニトリル系ポリマー）等で形成されたシェルの内部に溶剤が封入された粒子が挙げられる。中空粒子は、単一種だけを用いても、また、複数種を用いても、どちらでもよい。未膨張の中空粒子の粒径は、表面ゴム層１１ａの表面に被水時のスリップによる異音発生抑制に好適な中空粒子による平均孔径が大きい凹孔１７を形成する観点から、好ましくは１５μｍ以上、より好ましくは２５μｍ以上であり、また、好ましくは５０μｍ以下、より好ましくは３５μｍ以下である。中空粒子の膨張開始温度は、表面ゴム層１１ａの表面に被水時のスリップによる異音発生抑制に好適な中空粒子による平均孔径が大きい凹孔１７を形成する観点から、好ましくは１４０℃以上、より好ましくは１５０℃以上であり、また、好ましくは１８０℃以下、より好ましくは１７０℃以下である。中空粒子の配合量は、表面ゴム層１１ａの表面に被水時のスリップによる異音発生抑制に好適な中空粒子による平均孔径が大きい凹孔１７を形成する観点から、ゴム成分１００質量部に対して、好ましくは０．５質量部以上、より好ましくは１．０質量部以上であり、また、好ましくは１０質量部以下、より好ましくは５．０質量部以下である。なお、市販の中空粒子としては、例えば、積水化学工業社製の商品名：アドバンセルＥＭ４０３（粒径２６～３４μｍ，膨張開始温度：１５０～１７０℃）等が挙げられる。 The rubber composition constituting the surface rubber layer 11a is formed by crosslinking an uncrosslinked rubber composition in which unexpanded hollow particles and a pyrolytic foaming agent are blended in a rubber component. Examples of the particles include particles in which a solvent is enclosed in a shell formed of a thermoplastic polymer (for example, acrylonitrile-based polymer). The hollow particles may be either a single species or a plurality of species. The particle diameter of the unexpanded hollow particles is preferably 15 μm or more from the viewpoint of forming the concave holes 17 having a large average pore diameter due to the hollow particles suitable for suppressing the generation of abnormal noise due to slippage when wet on the surface of the surface rubber layer 11a. More preferably, it is 25 μm or more, preferably 50 μm or less, more preferably 35 μm or less. The expansion start temperature of the hollow particles is preferably 140 ° C. or higher, from the viewpoint of forming the concave holes 17 having a large average pore diameter due to the hollow particles suitable for suppressing the generation of abnormal noise due to slippage at the time of water on the surface of the surface rubber layer 11a. More preferably, it is 150 degreeC or more, Preferably it is 180 degreeC or less, More preferably, it is 170 degreeC or less. From the viewpoint of forming the concave holes 17 having a large average pore diameter due to the hollow particles suitable for suppressing the generation of abnormal noise due to slippage at the time of moisture on the surface of the surface rubber layer 11a, the amount of the hollow particles to be blended is 100 parts by mass of the rubber component. And preferably 0.5 parts by mass or more, more preferably 1.0 parts by mass or more, and preferably 10 parts by mass or less, more preferably 5.0 parts by mass or less. Examples of commercially available hollow particles include Sekisui Chemical Co., Ltd. trade name: ADVANCEL EM403 (particle size 26 to 34 μm, expansion start temperature: 150 to 170 ° C.).
　表面ゴム層１１ａを構成するゴム組成物は、内部に膨張した中空粒子により形成された多数の中空部１６を有すると共に、表面に中空粒子のシェルが破れて開口した多数の凹孔１７が露出している。それらの凹孔１７の平均孔径は、被水時のスリップによる異音発生抑制に好適であるという観点から、好ましくは７０μｍ以上、より好ましくは８０μｍ以上であり、また、好ましくは１２０μｍ以下、より好ましくは１１０μｍ以下である。凹孔１７の孔径の最大値と最小値との差、つまり、孔径差は、凹孔１７の孔径のばらつきの指標となるが、好ましくは５０μｍ以下、より好ましくは４０μｍ以下である。ここで、凹孔１７の孔径とは、表面ゴム層１１ａの表面に露出した凹孔１７の開口径であり、その平均孔径は、表面画像から測定される任意の５０～１００個の孔径の数平均として求めることができ、また、孔径差は、表面画像から測定される任意の５０～１００個の孔径の最大値と最小値との差として求めることができる。 The rubber composition that constitutes the surface rubber layer 11a has a large number of hollow portions 16 formed by hollow particles expanded inside, and a large number of concave holes 17 that are opened by breaking the shell of the hollow particles on the surface. ing. The average hole diameter of the concave holes 17 is preferably not less than 70 μm, more preferably not less than 80 μm, and more preferably not more than 120 μm, more preferably from the viewpoint that it is suitable for suppressing the generation of abnormal noise due to slippage when wet. Is 110 μm or less. The difference between the maximum value and the minimum value of the hole diameter of the concave hole 17, that is, the hole diameter difference is an indicator of the variation in the hole diameter of the concave hole 17, but is preferably 50 μm or less, more preferably 40 μm or less. Here, the hole diameter of the concave hole 17 is an opening diameter of the concave hole 17 exposed on the surface of the surface rubber layer 11a, and the average hole diameter is the number of arbitrary 50 to 100 hole diameters measured from the surface image. The pore diameter difference can be obtained as an average, and the pore diameter difference can be obtained as a difference between the maximum value and the minimum value of arbitrary 50 to 100 pore diameters measured from the surface image.
　未架橋ゴム組成物に配合される熱分解型発泡剤としては、例えば、アゾジカルボンアミドを主成分とするＡＤＣＡ系発泡剤、ジニトロソペンタメチレンテトラミンを主成分とするＤＰＴ系発泡剤、ｐ，ｐ’－オキシビスベンゼンスルホニルヒドラジドを主成分とするＯＢＳＨ系発泡剤、ヒドラゾジカルボンアミドを主成分とするＨＤＣＡ系発泡剤などの有機系発泡剤等が挙げられる。熱分解型発泡剤は、これらのうちの１種又は２種以上を用いることが好ましく、ＡＤＣＡ系発泡剤を用いることがより好ましい。なお、市販の熱分解型発泡剤としては、例えば、三協化成社製の商品名：セルマイクシリーズ等が挙げられる。 Examples of the thermally decomposable foaming agent blended in the uncrosslinked rubber composition include, for example, an ADCA foaming agent mainly composed of azodicarbonamide, a DPT foaming agent mainly composed of dinitrosopentamethylenetetramine, p, p Examples thereof include organic foaming agents such as an OBSH foaming agent mainly composed of '-oxybisbenzenesulfonylhydrazide and an HDCA foaming agent mainly composed of hydrazodicarbonamide. Of these, one or more of these pyrolytic foaming agents are preferably used, and ADCA foaming agents are more preferably used. In addition, as a commercially available thermal decomposition type foaming agent, the Sankyo Kasei Co., Ltd. brand name: Cell microphone series etc. are mentioned, for example.
　熱分解型発泡剤の分解温度は、中空粒子の膨張開始温度よりも高いが、具体的には、表面ゴム層１１ａの表面に被水時のスリップによる異音発生抑制に好適な中空粒子による平均孔径が大きい凹孔１７を形成する観点から、好ましくは１５０℃以上、より好ましくは１６０℃以上であり、また、好ましくは２３０℃以下、より好ましくは２１０℃以下である。中空粒子の膨張開始温度と熱分解型発泡剤の分解温度との温度差は、表面ゴム層１１ａの表面に被水時のスリップによる異音発生抑制に好適な平均孔径が大きい凹孔１７を形成する観点から、好ましくは１０℃以上、より好ましくは２０℃以上、更に好ましくは３５℃以上であり、また、好ましくは８０℃以下、より好ましくは６０℃以下である。 Although the decomposition temperature of the pyrolytic foaming agent is higher than the expansion start temperature of the hollow particles, specifically, the average of the hollow particles suitable for suppressing the generation of abnormal noise due to slip on the surface of the surface rubber layer 11a. From the viewpoint of forming the concave hole 17 having a large hole diameter, it is preferably 150 ° C. or higher, more preferably 160 ° C. or higher, and preferably 230 ° C. or lower, more preferably 210 ° C. or lower. The temperature difference between the expansion start temperature of the hollow particles and the decomposition temperature of the thermal decomposition type foaming agent forms a concave hole 17 having a large average hole diameter suitable for suppressing the generation of abnormal noise due to slippage when the water is wet on the surface of the surface rubber layer 11a. From this viewpoint, it is preferably 10 ° C. or higher, more preferably 20 ° C. or higher, still more preferably 35 ° C. or higher, and preferably 80 ° C. or lower, more preferably 60 ° C. or lower.
　熱分解型発泡剤の配合量は、表面ゴム層１１ａの表面に被水時のスリップによる異音発生抑制に好適な中空粒子による平均孔径が大きい凹孔１７を形成する観点から、ゴム成分１００質量部に対して、好ましくは０．５質量部以上、より好ましくは４質量部以上であり、また、好ましくは１０質量部以下、より好ましくは７質量部以下である。熱分解型発泡剤のゴム成分１００質量部に対する配合量は、未膨張の中空粒子のゴム成分１００質量部に対する配合量よりも多いことが好ましい。熱分解型発泡剤のゴム成分１００質量部に対する配合量の未膨張の中空粒子のゴム成分１００質量部に対する配合量に対する質量比（熱分解型発泡剤のゴム成分１００質量部に対する配合量／未膨張の中空粒子のゴム成分１００質量部に対する配合量）は、表面ゴム層１１ａの表面に被水時のスリップによる異音発生抑制に好適な中空粒子による平均孔径が大きい凹孔１７を形成する観点から、好ましくは１以上、より好ましくは２．５以上であり、また、好ましくは１０以下、より好ましくは８以下である。 The compounding amount of the pyrolytic foaming agent is 100 masses of the rubber component from the viewpoint of forming the concave holes 17 having a large average pore diameter due to the hollow particles suitable for suppressing the generation of abnormal noise due to slippage at the time of water on the surface of the surface rubber layer 11a. The amount is preferably 0.5 parts by mass or more, more preferably 4 parts by mass or more, and preferably 10 parts by mass or less, more preferably 7 parts by mass or less. The blending amount of the pyrolytic foaming agent with respect to 100 parts by weight of the rubber component is preferably larger than the blending amount of unexpanded hollow particles with respect to 100 parts by weight of the rubber component. Mass ratio of blended amount of unexpanded hollow particles to 100 parts by weight of rubber component of rubber component of pyrolytic foaming agent to blended amount of 100 parts by weight of rubber component (blended amount of 100 parts by weight of pyrolyzable foaming agent / unswelled The amount of the hollow particles blended with 100 parts by mass of the rubber component) is from the viewpoint of forming the concave holes 17 having a large average pore diameter due to the hollow particles suitable for suppressing the generation of abnormal noise due to slippage at the time of water on the surface rubber layer 11a. , Preferably 1 or more, more preferably 2.5 or more, and preferably 10 or less, more preferably 8 or less.
　表面ゴム層１１ａを構成するゴム組成物は、熱分解型発泡剤の発泡により内部に形成されたシェルを有さない多数の中空部１８を有すると共に、表面に形成されたシェルを有さない多数の凹孔１９が露出している。凹孔１９の孔径の最大値と最小値との差、つまり、孔径差は、中空粒子により形成された凹孔１７の孔径差よりも大きく、従って、孔径のばらつきが大きい。ここで、シェルを有さない凹孔１９の孔径とは、表面ゴム層１１ａの表面に露出したその開口径である。 The rubber composition constituting the surface rubber layer 11a has a large number of hollow portions 18 that do not have a shell formed therein by foaming of a pyrolytic foaming agent, and a large number that does not have a shell formed on the surface. The recessed hole 19 is exposed. The difference between the maximum value and the minimum value of the hole diameter of the concave hole 19, that is, the hole diameter difference is larger than the hole diameter difference of the concave hole 17 formed by the hollow particles, and therefore, the variation in the hole diameter is large. Here, the hole diameter of the concave hole 19 having no shell is the opening diameter exposed on the surface of the surface rubber layer 11a.
　表面ゴム層１１ａを構成するゴム組成物には、熱分解型発泡剤が分解して発泡した後の分解残渣が含まれる。具体的には、例えば、ＡＤＣＡ系発泡剤の場合には、表面ゴム層１１ａを構成するゴム組成物に分解残渣としてビウレアシアヌール酸ウラゾールが含まれることとなる。ＤＰＴ系発泡剤の場合には、表面ゴム層１１ａを構成するゴム組成物に分解残渣としてヘキサメチレンテトラミンが含まれることとなる。ＯＢＳＨ系発泡剤の場合には、表面ゴム層１１ａを構成するゴム組成物に分解残渣としてポリジチオフェニルエーテル及びポリチオフェニルベンゼンスルホニルエーテルが含まれることとなる。ＨＤＣＡ系発泡剤の場合には、表面ゴム層１１ａを構成するゴム組成物に分解残渣としてウラゾールが含まれることとなる。 The rubber composition constituting the surface rubber layer 11a includes a decomposition residue after the thermal decomposition type foaming agent is decomposed and foamed. Specifically, for example, in the case of an ADCA foaming agent, urazole biurea cyanurate is included as a decomposition residue in the rubber composition constituting the surface rubber layer 11a. In the case of the DPT foaming agent, hexamethylenetetramine is contained as a decomposition residue in the rubber composition constituting the surface rubber layer 11a. In the case of the OBSH-based foaming agent, the rubber composition constituting the surface rubber layer 11a contains polydithiophenyl ether and polythiophenylbenzenesulfonyl ether as decomposition residues. In the case of the HDCA-based foaming agent, the rubber composition constituting the surface rubber layer 11a contains urazole as a decomposition residue.
　表面ゴム層１１ａを構成するゴム組成物に配合されるその他のゴム配合剤としては、例えば、カーボンブラックなどの補強材、オイル、加工助剤、加硫助剤、架橋剤、加硫促進剤等が挙げられる。表面ゴム層１１ａを構成するゴム組成物には短繊維が配合されていてもよい。表面ゴム層１１ａを構成するゴム組成物は、架橋剤として硫黄が用いられた硫黄架橋系ゴム組成物であっても、また、架橋剤として有機過酸化物が用いられた有機過酸化物架橋系ゴム組成物であっても、更に、それらを併用した併用架橋系ゴム組成物であっても、いずれでもよい。 Examples of other rubber compounding agents blended in the rubber composition constituting the surface rubber layer 11a include reinforcing materials such as carbon black, oil, processing aids, vulcanization aids, crosslinking agents, vulcanization accelerators, and the like. Is mentioned. Short fibers may be blended in the rubber composition constituting the surface rubber layer 11a. The rubber composition constituting the surface rubber layer 11a may be a sulfur-crosslinked rubber composition in which sulfur is used as a crosslinking agent, or an organic peroxide crosslinked system in which an organic peroxide is used as a crosslinking agent. Either a rubber composition or a combined cross-linked rubber composition using them in combination may be used.
　内部ゴム層１１ｂは、ゴム成分にゴム配合剤を配合して混練した未架橋ゴム組成物を加熱及び加圧すると共に架橋させたゴム組成物で構成されている。 The inner rubber layer 11b is composed of a rubber composition in which an uncrosslinked rubber composition obtained by mixing and kneading a rubber compounding agent with a rubber component is heated and pressurized and crosslinked.
　内部ゴム層１１ｂを構成するゴム組成物のゴム成分としては、表面ゴム層１１ａの場合と同様、例えば、エチレン－α－オレフィンエラストマー等が挙げられる。内部ゴム層１１ｂを構成するゴム組成物のゴム成分は、表面ゴム層１１ａを構成するゴム組成物のゴム成分と同一であることが好ましい。 As the rubber component of the rubber composition constituting the inner rubber layer 11b, for example, an ethylene-α-olefin elastomer and the like can be cited as in the case of the surface rubber layer 11a. The rubber component of the rubber composition constituting the inner rubber layer 11b is preferably the same as the rubber component of the rubber composition constituting the surface rubber layer 11a.
　内部ゴム層１１ｂを構成するゴム組成物に配合されるゴム配合剤としては、表面ゴム層１１ａの場合と同様、例えば、カーボンブラックなどの補強材、軟化剤、加工助剤、加硫助剤、架橋剤、加硫促進剤、ゴム配合用樹脂、老化防止剤等が挙げられる。内部ゴム層１１ｂを構成するゴム組成物の架橋前の未架橋ゴム組成物には、未膨張の中空粒子及び熱分解型発泡剤が配合されていないことが好ましい。つまり、内部ゴム層１１ｂを構成するゴム組成物は中実であることが好ましい。内部ゴム層１１ｂを構成するゴム組成物には短繊維が配合されていないことが好ましい。内部ゴム層１１ｂを構成するゴム組成物は、架橋剤として硫黄が用いられた硫黄架橋系ゴム組成物であっても、また、架橋剤として有機過酸化物が用いられた有機過酸化物架橋系ゴム組成物であっても、更に、それらを併用した併用架橋系ゴム組成物であっても、いずれでもよい。内部ゴム層１１ｂの架橋系は、表面ゴム層１１ａの架橋系と同一であっても、また、異なっていても、どちらでもよい。 As a rubber compounding agent compounded in the rubber composition constituting the internal rubber layer 11b, for example, as in the case of the surface rubber layer 11a, for example, a reinforcing material such as carbon black, a softening agent, a processing aid, a vulcanizing aid, Examples thereof include a crosslinking agent, a vulcanization accelerator, a rubber compounding resin, and an antioxidant. The uncrosslinked rubber composition before crosslinking of the rubber composition constituting the inner rubber layer 11b is preferably not blended with unexpanded hollow particles and a pyrolytic foaming agent. That is, the rubber composition constituting the inner rubber layer 11b is preferably solid. It is preferable that the short fiber is not mix | blended with the rubber composition which comprises the internal rubber layer 11b. The rubber composition constituting the inner rubber layer 11b may be a sulfur-crosslinked rubber composition in which sulfur is used as a crosslinking agent, or an organic peroxide crosslinked system in which an organic peroxide is used as a crosslinking agent. Either a rubber composition or a combined cross-linked rubber composition using them in combination may be used. The cross-linking system of the inner rubber layer 11b may be the same as or different from the cross-linking system of the surface rubber layer 11a.
　接着ゴム層１２は、断面横長矩形の帯状に形成されており、厚さが例えば１．０～２．５ｍｍである。背面ゴム層１３も、断面横長矩形の帯状に形成されており、厚さが例えば０．４～０．８ｍｍである。背面ゴム層１３の表面は、ベルト背面が接触する平プーリとの間で生じる音を抑制する観点から、織布の布目が転写された形態に形成されていることが好ましい。 The adhesive rubber layer 12 is formed in a band shape having a horizontally long cross section and has a thickness of, for example, 1.0 to 2.5 mm. The back rubber layer 13 is also formed in a band shape having a horizontally long cross section and has a thickness of, for example, 0.4 to 0.8 mm. The surface of the back rubber layer 13 is preferably formed in a form in which the texture of the woven fabric is transferred from the viewpoint of suppressing the sound generated between the back rubber layer 13 and the flat pulley in contact with the belt back surface.
　接着ゴム層１２及び背面ゴム層１３のそれぞれは、ゴム成分にゴム配合剤を配合して混練した未架橋ゴム組成物を加熱及び加圧すると共に架橋させたゴム組成物で構成されている。 Each of the adhesive rubber layer 12 and the back rubber layer 13 is composed of a rubber composition obtained by heating and pressurizing and crosslinking a non-crosslinked rubber composition obtained by mixing a rubber compounding agent with a rubber component and kneading.
　接着ゴム層１２及び背面ゴム層１３を構成するゴム組成物のゴム成分としては、表面ゴム層１１ａの場合と同様、例えば、エチレン－α－オレフィンエラストマー等が挙げられる。接着ゴム層１２及び背面ゴム層１３を構成するゴム組成物のゴム成分は、表面ゴム層１１ａ及び／又は内部ゴム層１１ｂを構成するゴム組成物のゴム成分と同一であることが好ましい。 Examples of the rubber component of the rubber composition constituting the adhesive rubber layer 12 and the back rubber layer 13 include, for example, ethylene-α-olefin elastomers as in the case of the surface rubber layer 11a. The rubber component of the rubber composition constituting the adhesive rubber layer 12 and the back rubber layer 13 is preferably the same as the rubber component of the rubber composition constituting the surface rubber layer 11a and / or the internal rubber layer 11b.
　接着ゴム層１２及び背面ゴム層１３を構成するゴム組成物に配合されるゴム配合剤としては、表面ゴム層１１ａの場合と同様、例えば、カーボンブラックなどの補強材、軟化剤、加工助剤、加硫助剤、架橋剤、加硫促進剤、ゴム配合用樹脂、老化防止剤等が挙げられる。接着ゴム層１２及び背面ゴム層１３を構成するゴム組成物の架橋前の未架橋ゴム組成物には、未膨張の中空粒子及び熱分解型発泡剤が配合されていないことが好ましい。つまり、接着ゴム層１２及び背面ゴム層１３を構成するゴム組成物は中実であることが好ましい。接着ゴム層１２及び背面ゴム層１３を構成するゴム組成物には短繊維が配合されていてもよい。接着ゴム層１２及び背面ゴム層１３を構成するゴム組成物は、架橋剤として硫黄が用いられた硫黄架橋系ゴム組成物であっても、また、架橋剤として有機過酸化物が用いられた有機過酸化物架橋系ゴム組成物であっても、更に、それらを併用した併用架橋系ゴム組成物であっても、いずれでもよい。接着ゴム層１２及び背面ゴム層１３の架橋系は、表面ゴム層１１ａ及び／又は内部ゴム層１１ｂの架橋系と同一であっても、また、異なっていても、どちらでもよい。 As a rubber compounding agent compounded in the rubber composition constituting the adhesive rubber layer 12 and the back rubber layer 13, for example, a reinforcing material such as carbon black, a softening agent, a processing aid, as in the case of the surface rubber layer 11a, Examples include vulcanization aids, crosslinking agents, vulcanization accelerators, rubber compounding resins, anti-aging agents, and the like. The uncrosslinked rubber composition before crosslinking of the rubber composition constituting the adhesive rubber layer 12 and the back rubber layer 13 is preferably not blended with unexpanded hollow particles and a pyrolytic foaming agent. That is, it is preferable that the rubber composition constituting the adhesive rubber layer 12 and the back rubber layer 13 is solid. Short fibers may be blended in the rubber composition constituting the adhesive rubber layer 12 and the back rubber layer 13. The rubber composition constituting the adhesive rubber layer 12 and the back rubber layer 13 may be a sulfur-crosslinked rubber composition in which sulfur is used as a crosslinking agent, or an organic material in which an organic peroxide is used as a crosslinking agent. Either a peroxide cross-linked rubber composition or a combined cross-linked rubber composition using them in combination may be used. The crosslinking system of the adhesive rubber layer 12 and the back rubber layer 13 may be the same as or different from the crosslinking system of the surface rubber layer 11a and / or the internal rubber layer 11b.
　圧縮ゴム層１１の内部ゴム層１１ｂ、接着ゴム層１２、及び背面ゴム層１３は、別配合のゴム組成物で形成されていても、また、同じ配合のゴム組成物で形成されていても、どちらでもよい。 Even if the inner rubber layer 11b, the adhesive rubber layer 12, and the back rubber layer 13 of the compressed rubber layer 11 are formed of a rubber composition of a different composition or a rubber composition of the same composition, either will do.
　心線１４は、ポリエステル繊維（ＰＥＴ）、ポリエチレンナフタレート繊維（ＰＥＮ）、アラミド繊維、ビニロン繊維等の撚り糸で構成されている。心線１４は、Ｖリブドベルト本体１０に対する接着性を付与するために、成形加工前にＲＦＬ水溶液に浸漬された後に加熱される接着処理及び／又はゴム糊に浸漬された後に乾燥される接着処理が施されている。 The core wire 14 is composed of twisted yarns such as polyester fiber (PET), polyethylene naphthalate fiber (PEN), aramid fiber, vinylon fiber and the like. The core 14 is subjected to an adhesive treatment that is heated after being immersed in an RFL aqueous solution before forming and / or an adhesive treatment that is dried after being immersed in rubber paste in order to impart adhesion to the V-ribbed belt body 10. It has been subjected.
　次に、実施形態１に係るＶリブドベルトＢの製造方法について説明する。 Next, a method for manufacturing the V-ribbed belt B according to the first embodiment will be described.
　実施形態１に係るＶリブドベルトＢの製造では、図３及び４に示すように、同心状に設けられた、各々、円筒状の内型２１及び外型２２からなるベルト成形型２０を用いる。 In the manufacture of the V-ribbed belt B according to the first embodiment, as shown in FIGS. 3 and 4, a belt forming die 20 including a cylindrical inner die 21 and an outer die 22 provided concentrically is used.
　このベルト成形型２０では、内型２１はゴム等の可撓性材料で形成されている。外型２２は金属等の剛性材料で形成されている。外型２２の内周面は成型面に構成されており、その外型２２の内周面には、Ｖリブ形成溝２３が軸方向に一定ピッチで設けられている。また、外型２２には、水蒸気等の熱媒体や水等の冷媒体を流通させて温調する温調機構が設けられている。更に、このベルト成形型２０では、内型２１を内部から加圧膨張させるための加圧手段が設けられている。 In the belt mold 20, the inner mold 21 is formed of a flexible material such as rubber. The outer mold 22 is made of a rigid material such as metal. The inner peripheral surface of the outer mold 22 is formed as a molding surface, and V rib forming grooves 23 are provided on the inner peripheral surface of the outer mold 22 at a constant pitch in the axial direction. Further, the outer mold 22 is provided with a temperature control mechanism that controls the temperature by circulating a heat medium such as water vapor or a coolant such as water. Further, the belt mold 20 is provided with a pressurizing means for pressurizing and expanding the inner mold 21 from the inside.
　実施形態１に係るＶリブドベルトＢの製造において、まず、ゴム成分に各ゴム配合剤を配合し、ニーダー、バンバリーミキサー等の混練機で混練し、得られた未架橋ゴム組成物をカレンダー成形等によってシート状に成形して圧縮ゴム層１１の表面ゴム層用及び内部ゴム層用の未架橋ゴムシート１１ａ’，１１ｂ’を作製する。同様に、接着ゴム層用及び背面ゴム層用の未架橋ゴムシート１２’，１３’も作製する。また、心線用の撚り糸１４’をＲＦＬ水溶液に浸漬して加熱する接着処理を行い、必要に応じて、その後、ゴム糊に浸漬して加熱乾燥する接着処理を行う。 In the manufacture of the V-ribbed belt B according to the first embodiment, first, each rubber compounding agent is blended with the rubber component and kneaded by a kneader such as a kneader or a Banbury mixer, and the obtained uncrosslinked rubber composition is formed by calendar molding or the like. The uncrosslinked rubber sheets 11a ′ and 11b ′ for the surface rubber layer and the internal rubber layer of the compressed rubber layer 11 are produced by forming into a sheet shape. Similarly, uncrosslinked rubber sheets 12 'and 13' for the adhesive rubber layer and the back rubber layer are also produced. Further, an adhesive treatment is performed in which the twisted wire 14 ′ for the core wire is immersed in an RFL aqueous solution and heated, and thereafter, an adhesive treatment is performed in which the strand 14 d is immersed in rubber paste and dried by heating.
　このとき、表面ゴム層用の未架橋ゴムシート１１ａ’の作製においては、ゴム成分に未膨張の中空粒子１６’と熱分解型発泡剤とを配合する。 At this time, in the production of the uncrosslinked rubber sheet 11a 'for the surface rubber layer, the rubber component is blended with unexpanded hollow particles 16' and a pyrolytic foaming agent.
　次いで、図５に示すように、表面が平滑な円筒ドラム２４上にゴムスリーブ２５を被せ、その上に、背面ゴム層用の未架橋ゴムシート１３’、及び接着ゴム層用の未架橋ゴムシート１２’を順に巻き付けて積層し、その上から心線用の撚り糸１４’を円筒状の内型２１に対して螺旋状に巻き付け、更にその上から接着ゴム層用の未架橋ゴムシート１２’、並びに圧縮ゴム層１１における内部ゴム層用の未架橋ゴムシート１１ｂ’、及び表面ゴム層用の未架橋ゴムシート１１ａ’を順に巻き付けて積層体１０’を形成する。 Next, as shown in FIG. 5, a rubber sleeve 25 is placed on a cylindrical drum 24 having a smooth surface, and an uncrosslinked rubber sheet 13 ′ for the back rubber layer and an uncrosslinked rubber sheet for the adhesive rubber layer are placed thereon. 12 ′ are wound in order and laminated, and then a strand 14 ′ for a core wire is spirally wound around the cylindrical inner mold 21, and further, an uncrosslinked rubber sheet 12 ′ for an adhesive rubber layer is further formed thereon. In addition, the uncrosslinked rubber sheet 11b ′ for the inner rubber layer in the compressed rubber layer 11 and the uncrosslinked rubber sheet 11a ′ for the surface rubber layer are wound in order to form the laminate 10 ′.
　次いで、積層体１０’を設けたゴムスリーブ２５を円筒ドラム２４から外し、図６に示すように、それを外型２２の内周面側に内嵌め状態にセットする。 Next, the rubber sleeve 25 provided with the laminated body 10 ′ is removed from the cylindrical drum 24, and as shown in FIG. 6, it is set in an fitted state on the inner peripheral surface side of the outer mold 22.
　次いで、図７に示すように、内型２１を外型２２にセットされたゴムスリーブ２５内に位置付けて密閉する。 Next, as shown in FIG. 7, the inner mold 21 is positioned and sealed in the rubber sleeve 25 set on the outer mold 22.
　続いて、外型２２を加熱すると共に、内型２１の密封された内部に高圧空気等を注入して加圧する。 Subsequently, the outer mold 22 is heated, and high-pressure air or the like is injected into the sealed interior of the inner mold 21 to pressurize it.
　このとき、図８に示すように、内型２１が膨張し、外型２２の成型面に積層体１０’が圧接される。未架橋ゴムシート１１ａ’，１１ｂ’，１２’，１３’は、加熱及び加圧されると共に架橋して一体化し、また、撚り糸１４’と複合化した円筒状のベルトスラブＳが成型される。表面ゴム層用の未架橋ゴムシート１１ａ’は、中空粒子１６’が膨張することにより、内部にシェルを有する多数の中空部１６を形成すると共に、表面に中空粒子１６’のシェルが破れて開口した多数の凹孔１７が露出し、また、それと共に、熱分解型発泡剤が分解することにより、内部にシェルを有さない中空部１８を形成すると共に、表面にシェルを有さない凹孔１９が露出した表面ゴム層１１ａを構成する。ベルトスラブＳの成型温度は例えば１００～１８０℃、成型圧力は例えば０．５～２．０ＭＰａ、及び成型時間は例えば１０～６０分である。 At this time, as shown in FIG. 8, the inner mold 21 expands, and the laminate 10 ′ is pressed against the molding surface of the outer mold 22. The uncrosslinked rubber sheets 11a ', 11b', 12 ', and 13' are heated and pressurized and cross-linked and integrated, and a cylindrical belt slab S that is combined with the twisted yarn 14 'is molded. The uncrosslinked rubber sheet 11a ′ for the surface rubber layer forms a large number of hollow portions 16 having shells inside due to expansion of the hollow particles 16 ′, and the shell of the hollow particles 16 ′ is broken on the surface. A large number of the concave holes 17 are exposed, and the pyrolytic foaming agent is decomposed together with this to form a hollow portion 18 having no shell inside and a concave hole having no shell on the surface. The surface rubber layer 11a with 19 exposed is formed. The molding temperature of the belt slab S is, for example, 100 to 180 ° C., the molding pressure is, for example, 0.5 to 2.0 MPa, and the molding time is, for example, 10 to 60 minutes.
　この実施形態１に係るＶリブドベルトＢの製造方法によれば、既述の通り、プーリ接触部分を構成する表面ゴム層１１ａの表面には、中空粒子による平均孔径が大きく、且つ孔径のばらつきが小さい凹孔１７が形成される。これは、中空粒子１６’の膨張開始温度よりも熱分解型発泡剤の分解温度の方が高いことにより、まず中空粒子１６’が膨張した後、熱分解型発泡剤が分解して発泡することから、膨張した中空粒子１６’の内部に熱分解型発泡剤による発泡気体が導入され、その結果、どの中空粒子１６’の膨張もが助長されるためではないかと考えられる。 According to the method for manufacturing the V-ribbed belt B according to the first embodiment, as described above, the surface of the surface rubber layer 11a constituting the pulley contact portion has a large average pore diameter due to the hollow particles and a small variation in the pore diameter. A concave hole 17 is formed. This is because, since the decomposition temperature of the pyrolytic foaming agent is higher than the expansion start temperature of the hollow particle 16 ′, the hollow particle 16 ′ first expands, and then the pyrolytic foaming agent decomposes and foams. Therefore, it is considered that the foaming gas by the pyrolytic foaming agent is introduced into the expanded hollow particles 16 ′, and as a result, the expansion of any hollow particles 16 ′ is promoted.
　また、通常、ベルト成型時の成型圧力は高いため、中空粒子１６’の膨張が規制され、中空粒子１６’を十分に膨張させることは困難である。しかしながら、この実施形態１に係るＶリブドベルトＢの製造方法によれば、熱分解型発泡剤が分解して発泡することにより中空粒子１６’の膨張が助長されるので、ベルト成型時の高い成型圧力の下でも、中空粒子１６’を十分に大きく膨張させることができる。かかる観点からは、この中空粒子１６’の膨張助長の作用効果は、成型圧力が０．７ＭＰａ以上の場合、特には０．９ＭＰａ以上の場合に顕著に得ることができる。 In addition, since the molding pressure during belt molding is usually high, the expansion of the hollow particles 16 ′ is restricted, and it is difficult to sufficiently expand the hollow particles 16 ′. However, according to the manufacturing method of the V-ribbed belt B according to the first embodiment, the expansion of the hollow particles 16 ′ is promoted by the decomposition and foaming of the pyrolytic foaming agent. The hollow particles 16 ′ can be expanded sufficiently large even under. From this point of view, the effect of expansion promotion of the hollow particles 16 ′ can be remarkably obtained when the molding pressure is 0.7 MPa or more, particularly 0.9 MPa or more.
　なお、熱分解型発泡剤による発泡気体は、例えば、ＡＤＣＡ系発泡剤では窒素、ＤＰＴ系発泡剤では窒素、一酸化炭素、及び二酸化炭素、ＯＢＳＨ系発泡剤では窒素及び水蒸気、ＨＤＣＡ系発泡剤では窒素及びアンモニアである。 The foaming gas produced by the pyrolytic foaming agent is, for example, nitrogen for ADCA foaming agents, nitrogen, carbon monoxide and carbon dioxide for DPT foaming agents, nitrogen and water vapor for OBSH foaming agents, and HDCA foaming agents. Nitrogen and ammonia.
　そして、内型２１の内部を減圧して密閉を解き、内型２１と外型２２との間でゴムスリーブ２５を介して成型されたベルトスラブＳを取り出し、ベルトスラブＳを所定幅に輪切りして表裏を裏返すことによりＶリブドベルトＢが得られる。なお、必要に応じて、ベルトスラブＳの外周側、つまり、Ｖリブ１５側の表面を研磨してもよい。 Then, the inside of the inner mold 21 is decompressed to release the seal, the belt slab S molded between the inner mold 21 and the outer mold 22 is taken out via the rubber sleeve 25, and the belt slab S is cut into a predetermined width. The V-ribbed belt B is obtained by turning the front and back. If necessary, the outer peripheral side of the belt slab S, that is, the surface on the V rib 15 side may be polished.
　図９は、実施形態１に係るＶリブドベルトＢを用いた自動車の補機駆動ベルト伝動装置３０のプーリレイアウトを示す。この補機駆動ベルト伝動装置３０は、ＶリブドベルトＢが４つのリブプーリ及び２つの平プーリの６つのプーリに巻き掛けられて動力を伝達するサーペンタインドライブ方式のものである。 FIG. 9 shows a pulley layout of the auxiliary drive belt transmission device 30 for an automobile using the V-ribbed belt B according to the first embodiment. This accessory drive belt transmission device 30 is of a serpentine drive type in which a V-ribbed belt B is wound around six pulleys, four rib pulleys and two flat pulleys, to transmit power.
　この補機駆動ベルト伝動装置３０は、最上位置にリブプーリのパワーステアリングプーリ３１が設けられ、そのパワーステアリングプーリ３１の下方にリブプーリのＡＣジェネレータプーリ３２が設けられている。また、パワーステアリングプーリ３１の左下方には平プーリのテンショナプーリ３３が設けられており、そのテンショナプーリ３３の下方には平プーリのウォーターポンププーリ３４が設けられている。更に、テンショナプーリ３３の左下方にはリブプーリのクランクシャフトプーリ３５が設けられており、そのクランクシャフトプーリ３５の右下方にリブプーリのエアコンプーリ３６が設けられている。これらのプーリは、例えば、金属のプレス加工品や鋳物、ナイロン樹脂、フェノール樹脂などの樹脂成形品で構成されており、また、プーリ径がφ５０～１５０ｍｍである。 The auxiliary drive belt transmission device 30 is provided with a power steering pulley 31 of a rib pulley at the uppermost position, and an AC generator pulley 32 of a rib pulley is provided below the power steering pulley 31. A flat pulley tensioner pulley 33 is provided at the lower left of the power steering pulley 31, and a flat pulley water pump pulley 34 is provided below the tensioner pulley 33. Further, a ribshaft crankshaft pulley 35 is provided on the lower left side of the tensioner pulley 33, and a rib pulley air conditioner pulley 36 is provided on the lower right side of the crankshaft pulley 35. These pulleys are made of, for example, a metal stamped product, a molded product such as a casting, nylon resin, or phenol resin, and have a pulley diameter of 50 to 150 mm.
　そして、この補機駆動ベルト伝動装置３０では、ＶリブドベルトＢは、Ｖリブ１５側が接触するようにパワーステアリングプーリ３１に巻き掛けられ、次いで、ベルト背面が接触するようにテンショナプーリ３３に巻き掛けられた後、Ｖリブ１５側が接触するようにクランクシャフトプーリ３５及びエアコンプーリ３６に順に巻き掛けられ、更に、ベルト背面が接触するようにウォーターポンププーリ３４に巻き掛けられ、そして、Ｖリブ１５側が接触するようにＡＣジェネレータプーリ３２に巻き掛けられ、最後にパワーステアリングプーリ３１に戻るように設けられている。プーリ間で掛け渡されるＶリブドベルトＢの長さであるベルトスパン長は例えば５０～３００ｍｍである。プーリ間で生じ得るミスアライメントは０～２°である。 In this accessory drive belt transmission device 30, the V-ribbed belt B is wound around the power steering pulley 31 so that the V-rib 15 side contacts, and then wound around the tensioner pulley 33 so that the back surface of the belt contacts. After that, it is wound around the crankshaft pulley 35 and the air conditioner pulley 36 in order so that the V rib 15 side comes into contact, and further wound around the water pump pulley 34 so that the back surface of the belt comes into contact. Thus, it is wound around the AC generator pulley 32 and finally returned to the power steering pulley 31. The belt span length, which is the length of the V-ribbed belt B spanned between the pulleys, is, for example, 50 to 300 mm. Misalignment that can occur between pulleys is 0-2 °.
　（実施形態２）
　図１０は、実施形態２に係るＶリブドベルトＢ（伝動ベルト）を示す。なお、実施形態１と同一名称の部分は、実施形態１と同一符号を用いて示す。 (Embodiment 2)
FIG. 10 shows a V-ribbed belt B (power transmission belt) according to the second embodiment. In addition, the part of the same name as Embodiment 1 is shown using the same code | symbol as Embodiment 1. FIG.
　実施形態２に係るＶリブドベルトＢでは、圧縮ゴム層１１が実施形態１に係るＶリブドベルトＢにおける表面ゴム層１１ａと同様のゴム組成物で構成されている。すなわち、圧縮ゴム層１１は、ゴム成分に未膨張の中空粒子と熱分解型発泡剤とを含むゴム配合剤を配合して混練した未架橋ゴム組成物を加熱及び加圧すると共に架橋させたゴム組成物であって、それにより内部にシェルを有する中空粒子による多数の中空部が形成され且つ表面、つまり、プーリ接触表面にシェルを有する中空粒子による多数の凹孔１７が形成されたゴム組成物で構成されている。 In the V-ribbed belt B according to the second embodiment, the compressed rubber layer 11 is composed of the same rubber composition as the surface rubber layer 11a in the V-ribbed belt B according to the first embodiment. That is, the compressed rubber layer 11 is a rubber composition in which an uncrosslinked rubber composition obtained by mixing and kneading a rubber compounding agent containing unexpanded hollow particles and a pyrolytic foaming agent in a rubber component is heated and pressurized and crosslinked. A rubber composition in which a large number of hollow portions are formed by hollow particles having a shell inside and a large number of concave holes 17 are formed by a hollow particle having a shell on the pulley contact surface. It is configured.
　また、実施形態２に係るＶリブドベルトＢを製造においては、圧縮ゴム層用の未架橋ゴムシートとして、実施形態１に係るＶリブドベルトＢにおける表面ゴム層用の未膨張の中空粒子及び熱分解型発泡剤が配合された未架橋ゴムシートと同様の未架橋ゴムシートを用いればよい。 Further, in the manufacture of the V-ribbed belt B according to the second embodiment, as an uncrosslinked rubber sheet for the compressed rubber layer, unexpanded hollow particles for the surface rubber layer in the V-ribbed belt B according to the first embodiment and pyrolytic foaming An uncrosslinked rubber sheet similar to the uncrosslinked rubber sheet containing the agent may be used.
　その他の構成及び作用効果については実施形態１と同一である。 Other configurations and operational effects are the same as those in the first embodiment.
　（その他の実施形態）
　実施形態１及び２では、摩擦伝動ベルトとしてＶリブドベルトＢを示したが、特にこれに限定されるものではなく、ローエッジタイプのＶベルト等であってもよい。 (Other embodiments)
In the first and second embodiments, the V-ribbed belt B is shown as the friction transmission belt, but it is not particularly limited to this, and a low-edge type V-belt or the like may be used.
　実施形態１及び２では、圧縮ゴム層１１、接着ゴム層１２、及び背面ゴム層１３によりＶリブドベルト本体１０が構成されたものとしたが、特にこれに限定されるものではなく、圧縮ゴム層１１及び接着ゴム層１２によりＶリブドベルト本体１０が構成され、背面ゴム層１３の代わりに、例えば、綿、ポリアミド繊維、ポリエステル繊維、アラミド繊維等の糸で形成された織布、編物、不織布等で構成された補強布が設けられたものであってもよい。 In the first and second embodiments, the V-ribbed belt main body 10 is configured by the compressed rubber layer 11, the adhesive rubber layer 12, and the back rubber layer 13. However, the present invention is not particularly limited thereto, and the compressed rubber layer 11 is not limited thereto. In addition, the V-ribbed belt main body 10 is constituted by the adhesive rubber layer 12, and is constituted by a woven fabric, a knitted fabric, a non-woven fabric or the like formed of, for example, cotton, polyamide fiber, polyester fiber, aramid fiber or the like instead of the back rubber layer 13. It may be provided with a reinforcing cloth.
　実施形態１及び２では、ベルト伝動装置として自動車の補機駆動ベルト伝動装置２０を示したが、特にこれに限定されるものではなく、一般産業用等のベルト伝動装置であってもよい。 In Embodiments 1 and 2, although the auxiliary drive belt transmission device 20 of an automobile is shown as a belt transmission device, the belt transmission device is not particularly limited to this, and may be a belt transmission device for general industries.
　（ゴム組成物）
　以下の実施例１～３並びに比較例１及び２の未架橋ゴム組成物を調製した。それぞれの構成については表１にも示す。 (Rubber composition)
The uncrosslinked rubber compositions of Examples 1 to 3 and Comparative Examples 1 and 2 below were prepared. Each configuration is also shown in Table 1.
　＜実施例１＞
　密閉式のバンバリーミキサーのチャンバーにゴム成分としてのＥＰＤＭ（ＪＳＲ社製　商品名：ＥＰ２２）を投入して素練りし、次いで、このゴム成分１００質量部に対して、カーボンブラック（東海カーボン社製　商品名：シースト３）５０質量部、ステアリン酸（花王社製　商品名：ルナック）１質量部、オイル（日本サン石油社製　商品名：サンパー２２８０）８質量部、及び酸化亜鉛（堺化学工業社製　商品名：酸化亜鉛３種）５質量部を投入配合して混練することによりマスターバッチを調製した。 <Example 1>
EPDM (trade name: EP22 manufactured by JSR) as a rubber component is put into a chamber of a closed Banbury mixer and masticated, and then carbon black (product manufactured by Tokai Carbon Co., Ltd.) is added to 100 parts by mass of the rubber component. Name: Seast 3) 50 parts by mass, stearic acid (product name: Lunac) 1 part by mass, oil (manufactured by Nippon San Oil Co., Ltd., product name: Thamper 2280), and zinc oxide (manufactured by Sakai Chemical Industry Co., Ltd.) A master batch was prepared by charging and kneading 5 parts by mass of trade name: zinc oxide (3 types).
　マスターバッチを室温まで冷却した後、密閉式のバンバリーミキサーのチャンバーにそのマスターバッチを投入して再び混練すると共に、そこに、ゴム成分１００質量部に対して、硫黄（日本乾溜工業社製　商品名：セイミＯＴ）１．７質量部、加硫促進剤（大内新興化学社製　商品名：ＭＳＡ）４質量部、中空粒子（積水化学工業社製　商品名：アドバンセルＥＭ４０３　膨張開始温度Ｔａ：１５０～１７０℃）２．３質量部、及び熱分解型発泡剤１（三協化成社製　商品名：セルマイクＣＥ　ＡＤＣＡ系発泡剤　分解温度Ｔｂ：２０８℃）６．９質量部を投入配合して混練を継続し、チャンバー内の温度が１１０℃に達した時点で混練した未架橋ゴム組成物を放出した。そして、この未架橋ゴム組成物を実施例１とした。 After cooling the master batch to room temperature, the master batch is put into a sealed banbury mixer chamber and kneaded again, and there is sulfur (100 parts by mass of rubber component) : Seimi OT) 1.7 parts by mass, vulcanization accelerator (trade name: MSA, manufactured by Ouchi Shinsei Chemical Co., Ltd.), hollow particles (trade name: Advancel EM403, expansion start temperature Ta: 150 by Sekisui Chemical Co., Ltd.) ~ 170 ° C) 2.3 parts by mass and thermal decomposition type foaming agent 1 (manufactured by Sankyo Kasei Co., Ltd., trade name: Cellmic CE, ADCA-based foaming agent, decomposition temperature Tb: 208 ° C) 6.9 parts by mass are charged and mixed. The uncrosslinked rubber composition kneaded was released when the temperature in the chamber reached 110 ° C. The uncrosslinked rubber composition was designated as Example 1.
　実施例１では、中空粒子の膨張開始温度と熱分解型発泡剤１の分解温度との温度差（Ｔｂ－Ｔａ）が３８～５８℃、及び熱分解型発泡剤の配合量の中空粒子の配合量に対する質量比が３．０である。 In Example 1, the temperature difference (Tb-Ta) between the expansion start temperature of the hollow particles and the decomposition temperature of the pyrolytic foaming agent 1 is 38 to 58 ° C., and the blending amount of the hollow particles having the blending amount of the pyrolytic foaming agent is used. The mass ratio to the amount is 3.0.
　＜実施例２＞
　中空粒子及び熱分解型発泡剤１の配合量を、ゴム成分１００質量部に対して、それぞれ１．２質量部及び８．７質量部としたことを除いて、実施例１と同一構成の未架橋ゴム組成物を実施例２とした。実施例２では、中空粒子の膨張開始温度と熱分解型発泡剤１の分解温度との温度差（Ｔｂ－Ｔａ）が３８～５８℃、及び熱分解型発泡剤の配合量の中空粒子の配合量に対する質量比が７．３である。 <Example 2>
Except that the blending amounts of the hollow particles and the pyrolyzable foaming agent 1 were 1.2 parts by mass and 8.7 parts by mass, respectively, with respect to 100 parts by mass of the rubber component, the same composition as in Example 1 The crosslinked rubber composition was designated as Example 2. In Example 2, the temperature difference (Tb-Ta) between the expansion start temperature of the hollow particles and the decomposition temperature of the pyrolytic foaming agent 1 is 38 to 58 ° C., and the blending amount of the hollow particles in the blending amount of the pyrolytic foaming agent is used. The mass ratio to the quantity is 7.3.
　＜実施例３＞
　中空粒子の配合量をゴム成分１００質量部に対して３．５質量部とし、熱分解型発泡剤１の代わりに熱分解型発泡剤２（三協化成社製　商品名：セルマイクＡ　ＤＰＴ系発泡剤　分解温度Ｔｂ：２０５℃）をゴム成分１００質量部に対して４．１質量部配合したことを除いて、実施例１と同一構成の未架橋ゴム組成物を実施例３とした。実施例３では、中空粒子の膨張開始温度と熱分解型発泡剤２の分解温度との温度差（Ｔｂ－Ｔａ）が３５～５５℃、及び熱分解型発泡剤の配合量の中空粒子の配合量に対する質量比が１．２である。 <Example 3>
The blended amount of the hollow particles is 3.5 parts by mass with respect to 100 parts by mass of the rubber component, and instead of the pyrolyzable foaming agent 1, a pyrolyzable foaming agent 2 (trade name: Cellmic A DPT foaming manufactured by Sankyo Kasei Co., Ltd.) An uncrosslinked rubber composition having the same structure as Example 1 was used in Example 3, except that 4.1 parts by mass of the agent decomposition temperature Tb: 205 ° C. was added to 100 parts by mass of the rubber component. In Example 3, the temperature difference (Tb-Ta) between the expansion start temperature of the hollow particles and the decomposition temperature of the pyrolytic foaming agent 2 is 35 to 55 ° C., and the blending amount of the hollow particles in the blending amount of the pyrolytic foaming agent is used. The mass ratio to the quantity is 1.2.
　＜比較例１＞
　熱分解型発泡剤１を配合せず、中空粒子の配合量をゴム成分１００質量部に対して１０質量部としたことを除いて、実施例１と同一構成の未架橋ゴム組成物を比較例１とした。 <Comparative Example 1>
An uncrosslinked rubber composition having the same configuration as that of Example 1 was compared except that the pyrolytic foaming agent 1 was not blended and the blended amount of the hollow particles was 10 parts by mass with respect to 100 parts by mass of the rubber component. It was set to 1.
　＜比較例２＞
　中空粒子を配合せず、熱分解型発泡剤１の配合量をゴム成分１００質量部に対して１０質量部としたことを除いて、実施例１と同一構成の未架橋ゴム組成物を比較例２とした。 <Comparative example 2>
A non-crosslinked rubber composition having the same configuration as that of Example 1 was compared except that the hollow particles were not blended and the blending amount of the pyrolyzable foaming agent 1 was 10 parts by mass with respect to 100 parts by mass of the rubber component. 2.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　（試験評価方法）
　＜平均孔径＞
　実施例１～３並びに比較例１及び２の未架橋ゴム組成物のそれぞれについて、ロールミルにより厚さ２ｍｍのシート状に圧延し、それを用いてプレス成型することにより長さ７５ｍｍ、幅２５ｍｍ、及び厚さ５ｍｍの架橋したゴム組成物の板状の試験片を作製した。成型条件は、成型温度を１７０℃、成型圧力を０．９ＭＰａ、及び成型時間を３０分とした。 (Test evaluation method)
<Average pore diameter>
Each of the uncrosslinked rubber compositions of Examples 1 to 3 and Comparative Examples 1 and 2 was rolled into a sheet having a thickness of 2 mm by a roll mill, and press-molded using the rolled sheet, and the length was 75 mm, the width was 25 mm, and A plate-shaped test piece of a crosslinked rubber composition having a thickness of 5 mm was prepared. The molding conditions were a molding temperature of 170 ° C., a molding pressure of 0.9 MPa, and a molding time of 30 minutes.
　そして、試験片の表面形態をマイクロスコープ（キーエンス社製　型番：ＶＨＸ－２０００）で２００倍に拡大して観察し、実施例１～３及び比較例１では、中空粒子によるシェルを有する凹孔について、また、比較例２では、熱分解型発泡剤によるシェルを有さない凹孔について、任意の１００個の孔径を測定し、それらの数平均を平均孔径とした。 Then, the surface morphology of the test piece was observed with a microscope (Model: VHX-2000, manufactured by Keyence Corporation) at a magnification of 200 times. In Examples 1 to 3 and Comparative Example 1, a concave hole having a shell made of hollow particles was observed. Moreover, in Comparative Example 2, with respect to the concave holes that do not have a shell made of the pyrolytic foaming agent, arbitrary 100 hole diameters were measured, and the number average thereof was taken as the average hole diameter.
　＜孔径差＞
　実施例１～３並びに比較例１及び２の架橋したゴム組成物のそれぞれについて、マイクロスコープ（キーエンス社製　型番：ＶＨＸ－２０００）で２００倍に拡大して観察し、任意の１００個の孔径を測定し、孔径の最大値と最小値との差を孔径のばらつき（孔径差）とした。 <Diameter difference>
Each of the crosslinked rubber compositions of Examples 1 to 3 and Comparative Examples 1 and 2 was observed with a microscope (model number: VHX-2000, manufactured by Keyence Corporation) at a magnification of 200 times, and an arbitrary 100 pore sizes were observed. Measurement was made and the difference between the maximum value and the minimum value of the pore diameter was defined as the variation in pore diameter (pore diameter difference).
　＜異音評価＞
　図１１は被水時異音評価用ベルト走行試験機４０のプーリレイアウトを示す。 <Allophone evaluation>
FIG. 11 shows a pulley layout of the belt running test machine 40 for evaluating abnormal noise when wet.
　被水時異音評価用ベルト走行試験機４０は、プーリ径が１４０ｍｍのリブプーリである駆動プーリ４１を備え、その駆動プーリ４１の右方にプーリ径が７５ｍｍのリブプーリである第１従動プーリ４２が設けられ、また、第１従動プーリ４２の上方で駆動プーリ４１の右斜め上方にプーリ径が５０ｍｍのリブプーリである第２従動プーリ４３が設けられ、さらに、駆動プーリ４１と第２従動プーリ４３との中間にプーリ径が７５ｍｍの平プーリであるアイドラプーリ４４が設けられている。そして、この被水時異音評価用ベルト走行試験機４０は、ＶリブドベルトＢのＶリブ側がリブプーリである駆動プーリ４１、第１及び第２従動プーリ４２，４３に接触すると共に、背面側が平プーリであるアイドラプーリ４４に接触して巻き掛けられるように構成されている。 The belt running test machine 40 for evaluating abnormal noise when wet is provided with a drive pulley 41 that is a rib pulley having a pulley diameter of 140 mm, and a first driven pulley 42 that is a rib pulley having a pulley diameter of 75 mm is provided to the right of the drive pulley 41. A second driven pulley 43, which is a rib pulley having a pulley diameter of 50 mm, is provided above the first driven pulley 42 and diagonally right above the driving pulley 41. Further, the driving pulley 41, the second driven pulley 43, An idler pulley 44, which is a flat pulley having a pulley diameter of 75 mm, is provided in the middle. In this belt running test machine 40 for evaluating abnormal noise when wet, the V-rib side of the V-ribbed belt B is in contact with the drive pulley 41, the first and second driven pulleys 42, 43, which are rib pulleys, and the back side is a flat pulley. It is configured to be wound around in contact with the idler pulley 44.
　実施例１～３並びに比較例１及び２のそれぞれの未架橋ゴム組成物により圧縮ゴム層を形成した５種のＶリブドベルトを製作し、各ＶリブドベルトＢについて、上記被水時異音評価用ベルト走行試験機４０にセットし、１リブ当たり４９Ｎのベルト張力が負荷されるようにプーリ位置決めを行い、第２従動プーリ４３にそれが取り付けられたオルタネータに６０Ａの電流が流れるように抵抗を与え、常温下、駆動プーリ４１を８００ｒｐｍの回転数で回転させると共に、ＶリブドベルトＢの駆動プーリ４１への進入部においてＶリブドベルトＢのＶリブ側に毎分１０００ｍｌの割合で水を滴下した。そして、ベルト走行時の異音発生状況を、大、小、微小、及び無の四段階で評価した。 Five types of V-ribbed belts each having a compressed rubber layer formed of the uncrosslinked rubber compositions of Examples 1 to 3 and Comparative Examples 1 and 2 were manufactured. Set in the running test machine 40, position the pulley so that a belt tension of 49 N per rib is applied, give resistance to the second driven pulley 43 so that a current of 60 A flows to the alternator to which it is attached, Under normal temperature, the drive pulley 41 was rotated at a rotation speed of 800 rpm, and water was dropped at a rate of 1000 ml per minute on the V rib side of the V ribbed belt B at the entry portion of the V ribbed belt B into the drive pulley 41. And the abnormal noise generation | occurrence | production situation at the time of belt running was evaluated in four steps, large, small, minute, and nothing.
　（試験評価結果）
　表１に試験結果を示す。 (Test evaluation results)
Table 1 shows the test results.
　表１によれば、中空粒子及び熱分解型発泡剤を併用した実施例１～３では、中空粒子による凹孔の平均孔径が９２μｍ、１０９μｍ、及び７８μｍと比較的大きいのに対し、中空粒子のみを用いた比較例１では、中空粒子による凹孔の平均孔径が５０μｍであり、実施例１～３の中空粒子による凹孔に比べると小さいことが分かる。 According to Table 1, in Examples 1 to 3 in which the hollow particles and the pyrolytic foaming agent are used in combination, the average pore diameter of the hollow holes due to the hollow particles is relatively large as 92 μm, 109 μm, and 78 μm, whereas only the hollow particles are used. In Comparative Example 1 using No. 1, the average pore diameter of the hollow holes by the hollow particles is 50 μm, which is smaller than the concave holes by the hollow particles of Examples 1 to 3.
　また、表面形態の観察によれば、中空粒子及び熱分解型発泡剤を併用した実施例１～３では、中空粒子による凹孔の孔径差が小さい、つまり、凹孔の孔径のばらつきが小さいのに対し、熱分解型発泡剤のみを用いた比較例２では、凹孔の平均孔径は大きいものの、実施例１～３の中空粒子による凹孔に比べると、孔径差が大きい、つまり、凹孔の孔径のばらつきが明らかに大きいことが分かる。 In addition, according to the observation of the surface form, in Examples 1 to 3 in which the hollow particles and the pyrolytic foaming agent are used in combination, the difference in the hole diameters of the hollow holes due to the hollow particles is small, that is, the variation in the hole diameters of the concave holes is small. On the other hand, in Comparative Example 2 using only the pyrolytic foaming agent, although the average pore diameter of the concave holes is large, the pore diameter difference is large compared to the concave holes of the hollow particles of Examples 1 to 3, that is, the concave holes It can be seen that the variation in the pore diameter is clearly large.
　更に、実施例１～３では、比較例１及び２に比べ、ベルト走行時の異音抑制効果が高いことが分かる。 Furthermore, it can be seen that Examples 1 to 3 have a higher noise suppressing effect during belt travel than Comparative Examples 1 and 2.
　本発明は、伝動ベルト及びその製造方法について有用である。 The present invention is useful for a transmission belt and a manufacturing method thereof.

Claims (13)

  1. 　ゴム成分に未膨張の中空粒子と熱分解型発泡剤とを配合した未架橋ゴム組成物を加熱及び加圧すると共に架橋させることにより前記中空粒子が膨張して形成された多数の凹孔が表面に露出したゴム組成物でプーリ接触部分を構成する伝動ベルトの製造方法であって、
    　前記中空粒子の膨張開始温度よりも前記熱分解型発泡剤の分解温度の方が高い伝動ベルトの製造方法。     An uncrosslinked rubber composition in which unexpanded hollow particles and a thermally decomposable foaming agent are blended with a rubber component is heated and pressurized and crosslinked to form a number of concave holes formed on the surface by expanding the hollow particles. A method of manufacturing a power transmission belt comprising a pulley contact portion with an exposed rubber composition,
    A method for producing a transmission belt, wherein the decomposition temperature of the pyrolytic foaming agent is higher than the expansion start temperature of the hollow particles.
  2. 　請求項１に記載された伝動ベルトの製造方法において、
    　前記中空粒子の膨張開始温度が１４０～１８０℃である伝動ベルトの製造方法。     In the manufacturing method of the power transmission belt described in Claim 1,
    A method for producing a transmission belt, wherein the expansion start temperature of the hollow particles is 140 to 180 ° C.
  3. 　請求項１又は２に記載された伝動ベルトの製造方法において、
    　前記熱分解型発泡剤の分解温度が１５０～２３０℃である伝動ベルトの製造方法。     In the manufacturing method of the power transmission belt described in Claim 1 or 2,
    A method for producing a power transmission belt, wherein the decomposition temperature of the pyrolytic foaming agent is 150 to 230 ° C.
  4. 　請求項１乃至３のいずれかに記載された伝動ベルトの製造方法において、
    　前記中空粒子の膨張開始温度と前記熱分解型発泡剤の分解温度との温度差が１０～８０℃である伝動ベルトの製造方法。     In the manufacturing method of the power transmission belt according to any one of claims 1 to 3,
    A method for producing a transmission belt, wherein a temperature difference between an expansion start temperature of the hollow particles and a decomposition temperature of the pyrolytic foaming agent is 10 to 80 ° C.
  5. 　請求項１乃至４のいずれかに記載された伝動ベルトの製造方法において、
    　前記未膨張の中空粒子の前記ゴム成分１００質量部に対する配合量が０．５～１０質量部である伝動ベルトの製造方法。     In the manufacturing method of the power transmission belt according to any one of claims 1 to 4,
    A method for producing a transmission belt, wherein the blending amount of the unexpanded hollow particles with respect to 100 parts by mass of the rubber component is 0.5 to 10 parts by mass.
  6. 　請求項１乃至５のいずれかに記載された伝動ベルトの製造方法において、
    　前記熱分解型発泡剤の前記ゴム成分１００質量部に対する配合量が０．５～１０質量部である伝動ベルトの製造方法。     In the manufacturing method of the power transmission belt according to any one of claims 1 to 5,
    A method for producing a power transmission belt, wherein a blending amount of the pyrolytic foaming agent with respect to 100 parts by mass of the rubber component is 0.5 to 10 parts by mass.
  7. 　請求項１乃至３のいずれかに記載された伝動ベルトの製造方法において、
    　前記未膨張の中空粒子の前記ゴム成分１００質量部に対する配合量よりも前記熱分解型発泡剤の前記ゴム成分１００質量部に対する配合量の方が多い伝動ベルトの製造方法。
          In the manufacturing method of the power transmission belt according to any one of claims 1 to 3,
    A method for producing a transmission belt, wherein the amount of the thermally decomposable foaming agent added to 100 parts by mass of the rubber component is larger than the amount of the unexpanded hollow particles to 100 parts by mass of the rubber component.
  8. 　請求項１乃至７のいずれかに記載された伝動ベルトの製造方法において、
    　前記熱分解型発泡剤のゴム成分１００質量部に対する配合量の前記未膨張の中空粒子のゴム成分１００質量部に対する配合量に対する質量比（熱分解型発泡剤のゴム成分１００質量部に対する配合量／未膨張の中空粒子のゴム成分１００質量部に対する配合量）が１～１０である伝動ベルトの製造方法。     In the manufacturing method of the power transmission belt according to any one of claims 1 to 7,
    Mass ratio of blending amount of 100 parts by weight of the thermally decomposable foaming agent to 100 parts by weight of the unexpanded hollow particles (blending amount of 100 parts by weight of the thermally decomposable foaming agent / A method for producing a transmission belt, wherein the amount of unexpanded hollow particles is 1 to 10 with respect to 100 parts by mass of the rubber component.
  9. 　請求項１乃至８のいずれかに記載された伝動ベルトの製造方法において、
    　前記熱分解型発泡剤が、ＡＤＣＡ系発泡剤、ＤＰＴ系発泡剤、ＯＢＳＨ系発泡剤、及びＨＤＣＡ系発泡剤のうちの１種又は２種以上である伝動ベルトの製造方法。     In the manufacturing method of the power transmission belt according to any one of claims 1 to 8,
    A method for producing a transmission belt, wherein the pyrolyzable foaming agent is one or more of an ADCA foaming agent, a DPT foaming agent, an OBSH foaming agent, and an HDCA foaming agent.
  10. 　請求項１乃至９のいずれかに記載された伝動ベルトの製造方法において、
    　前記未架橋ゴム組成物を加熱及び加圧するときの成型圧力を０．７ＭＰａ以上とする伝動ベルトの製造方法。     In the manufacturing method of the power transmission belt according to any one of claims 1 to 9,
    A method for producing a transmission belt, wherein a molding pressure when the uncrosslinked rubber composition is heated and pressurized is 0.7 MPa or more.
  11. 　請求項１乃至１０のいずれかに記載された伝動ベルトの製造方法において、
    　前記中空粒子による前記多数の凹孔の平均孔径が７０～１２０μｍである伝動ベルトの製造方法。     In the manufacturing method of the power transmission belt according to any one of claims 1 to 10,
    A method for producing a power transmission belt, wherein the average diameter of the plurality of concave holes by the hollow particles is 70 to 120 μm.
  12. 　請求項１乃至１１のいずれかに記載された伝動ベルトの製造方法において、
    　前記中空粒子による前記多数の凹孔の孔径差が５０μｍ以下である伝動ベルトの製造方法。     In the manufacturing method of the power transmission belt according to any one of claims 1 to 11,
    A method for producing a transmission belt, wherein a difference in the diameters of the plurality of concave holes due to the hollow particles is 50 μm or less.
  13. 　ゴム成分に未膨張の中空粒子と熱分解型発泡剤とを配合した未架橋ゴム組成物を加熱及び加圧すると共に架橋させることにより前記中空粒子が膨張して形成された多数の凹孔が表面に露出したゴム組成物でプーリ接触部分が構成された伝動ベルトであって、
    　前記中空粒子による前記多数の凹孔の平均孔径が７０～１２０μｍであり、且つ前記中空粒子による前記多数の凹孔の孔径差が５０μｍ以下である伝動ベルト。     An uncrosslinked rubber composition in which unexpanded hollow particles and a thermally decomposable foaming agent are blended with a rubber component is heated and pressurized and crosslinked to form a number of concave holes formed on the surface by expanding the hollow particles. A transmission belt having a pulley contact portion made of an exposed rubber composition,
    The transmission belt, wherein an average hole diameter of the plurality of concave holes due to the hollow particles is 70 to 120 μm, and a hole diameter difference between the multiple concave holes due to the hollow particles is 50 μm or less.
PCT/JP2015/003192 2014-08-26 2015-06-25 Transmission belt and manufacturing method therefor WO2016031112A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017123722A1 (en) * 2017-10-12 2019-04-18 Arntz Beteiligungs Gmbh & Co. Kg At least three-layer power transmission belt with a foamed buffer layer

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JPS52123457A (en) * 1976-04-08 1977-10-17 Keiichi Yamamoto Resilient composite foamed material and its manufacturing process
JPS5774340A (en) * 1980-10-27 1982-05-10 Meiji Gomme Kasei:Kk Rubber composition
JPS591541A (en) * 1982-06-29 1984-01-06 Japan Synthetic Rubber Co Ltd Expanded rubber composition
JPH11275930A (en) * 1998-03-27 1999-10-12 Mitsuboshi Belting Ltd Belt for harvesting agricultural product
WO2009101799A1 (en) * 2008-02-13 2009-08-20 Bando Chemical Industries, Ltd. Friction transmission belt
WO2012172717A1 (en) * 2011-06-17 2012-12-20 バンドー化学株式会社 Method for manufacturing a v-ribbed belt

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52123457A (en) * 1976-04-08 1977-10-17 Keiichi Yamamoto Resilient composite foamed material and its manufacturing process
JPS5774340A (en) * 1980-10-27 1982-05-10 Meiji Gomme Kasei:Kk Rubber composition
JPS591541A (en) * 1982-06-29 1984-01-06 Japan Synthetic Rubber Co Ltd Expanded rubber composition
JPH11275930A (en) * 1998-03-27 1999-10-12 Mitsuboshi Belting Ltd Belt for harvesting agricultural product
WO2009101799A1 (en) * 2008-02-13 2009-08-20 Bando Chemical Industries, Ltd. Friction transmission belt
WO2012172717A1 (en) * 2011-06-17 2012-12-20 バンドー化学株式会社 Method for manufacturing a v-ribbed belt

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017123722A1 (en) * 2017-10-12 2019-04-18 Arntz Beteiligungs Gmbh & Co. Kg At least three-layer power transmission belt with a foamed buffer layer
DE102017123722B4 (en) 2017-10-12 2020-05-28 Arntz Beteiligungs Gmbh & Co. Kg At least three-layer power transmission belt with a foamed buffer layer and method for producing such a power transmission belt

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