WO2021152664A1 - Composition de caoutchouc destinée à une semelle de jambe prothétique et semelle de jambe prothétique - Google Patents

Composition de caoutchouc destinée à une semelle de jambe prothétique et semelle de jambe prothétique Download PDF

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Publication number
WO2021152664A1
WO2021152664A1 PCT/JP2020/002786 JP2020002786W WO2021152664A1 WO 2021152664 A1 WO2021152664 A1 WO 2021152664A1 JP 2020002786 W JP2020002786 W JP 2020002786W WO 2021152664 A1 WO2021152664 A1 WO 2021152664A1
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Prior art keywords
sole
prosthesis
rubber
mass
rubber composition
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PCT/JP2020/002786
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English (en)
Japanese (ja)
Inventor
健太郎 吉澤
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株式会社ブリヂストン
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Priority to PCT/JP2020/002786 priority Critical patent/WO2021152664A1/fr
Publication of WO2021152664A1 publication Critical patent/WO2021152664A1/fr

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    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B13/00—Soles; Sole-and-heel integral units
    • A43B13/02—Soles; Sole-and-heel integral units characterised by the material
    • A43B13/04—Plastics, rubber or vulcanised fibre
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50—Prostheses not implantable in the body
    • A61F2/60—Artificial legs or feet or parts thereof
    • A61F2/66—Feet; Ankle joints
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
    • C08K3/013—Fillers, pigments or reinforcing additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/04—Carbon
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L7/00—Compositions of natural rubber
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons

Definitions

  • the present invention relates to a rubber composition for a prosthesis sole and a sole for a prosthesis.
  • Patent Document 1 discloses a technique for attaching a rubber sole to cover a spike in an artificial leg for competition.
  • an object of the present invention is a rubber composition for a prosthesis sole capable of achieving both anti-slip properties and abrasion resistance when used for a prosthesis sole at a high level, and excellent anti-slip properties and abrasion resistance. It is to provide soles for artificial legs.
  • the constitutional gist of the present invention for solving the above-mentioned problems is as follows.
  • the rubber composition for a prosthesis sole of the present invention contains a rubber component containing at least one selected from natural rubber and synthetic diene rubber, and 30 parts by mass or more and less than 50 parts by mass with respect to 100 parts by mass of the rubber component. It is characterized by containing at least one filler selected from carbon black and an inorganic filler.
  • the filler contains at least carbon black. This is because the wear resistance when used for the sole of the artificial leg can be further improved.
  • the rubber component contains at least 10% by mass or more of natural rubber. This is because the wear resistance when used for the sole of the artificial leg can be further improved.
  • the rubber component preferably contains at least 10% by mass or more of natural rubber, and preferably contains polybutadiene rubber as the synthetic diene rubber. This is because the anti-slip property when used for the sole of the artificial leg can be further enhanced.
  • the sole for artificial legs of the present invention is characterized in that the rubber composition for artificial legs sole of the present invention is used.
  • the prosthesis sole is a contact extending from the toe to the curved portion side of a competition prosthesis having a leaf spring-shaped foot portion extending toward the toe side via a curved portion. It has a bottom surface that is attached to the area and has a pattern formed by a plurality of irregularities, and the bottom surface of the prosthesis sole is the bottom surface of the prosthesis sole when the wearer wearing the competition prosthesis is upright.
  • the line extending in the width direction of the foot through the contact point between the foot and the road surface is defined as the boundary line
  • the negative ratio on the curved portion side of the boundary line is 35 to 80%, and from the boundary line.
  • the negative ratio on the toe side is preferably 55% or less. This is because both anti-slip property and wear resistance can be achieved at a higher level.
  • the sole for artificial legs of the present invention it is preferable that the sole for artificial legs is directly or indirectly attached to the leaf spring. This is because the anti-slip property and wear resistance of the present invention can be exhibited more effectively.
  • a rubber composition for a prosthesis sole capable of achieving both anti-slip properties and abrasion resistance when used for a prosthesis sole at a high level, and a prosthesis having excellent anti-slip properties and abrasion resistance.
  • a prosthesis sole capable of achieving both anti-slip properties and abrasion resistance when used for a prosthesis sole at a high level, and a prosthesis having excellent anti-slip properties and abrasion resistance.
  • a rubber composition for a prosthesis sole capable of achieving both anti-slip properties and abrasion resistance when used for a prosthesis sole at a high level, and a prosthesis having excellent anti-slip properties and abrasion resistance.
  • FIG. 1 It is a figure for phasing out the movement of the foot and the ground contact form in the case where a prosthetic leg for competition is worn and the wearer goes straight.
  • FIG. 1 is a figure which shows an example of the pattern of the sole bottom surface of the sole for artificial legs which concerns on one Embodiment of this invention.
  • the rubber composition for a prosthesis sole of the present invention (hereinafter, may be simply referred to as "rubber composition") contains a rubber component containing at least one selected from natural rubber and synthetic diene rubber, and the rubber component 100. Includes at least one filler selected from carbon black and inorganic fillers, which is 30 parts by mass or more and less than 50 parts by mass with respect to parts by mass.
  • the grip force and wear resistance on dry road surface and wet road surface are improved.
  • the rubber composition for a prosthesis sole of the present invention contains a rubber component.
  • the rubber component contains at least one selected from natural rubber and synthetic diene rubber. Natural rubber and synthetic diene rubber are highly wear-resistant and have high grip, which contributes to the improvement of anti-slip and wear resistance when the rubber composition is used for the sole of a prosthesis. can.
  • the content of at least one selected from the natural rubber and the synthetic diene rubber in the rubber component is not particularly limited, but from the viewpoint of achieving both anti-slip property and wear resistance at a higher level, the content is not particularly limited. It is preferably 10% by mass or more, more preferably 20% by mass or more, and further preferably 30% by mass.
  • the upper limit of the content of at least one selected from the natural rubber and the synthetic diene rubber in the rubber component is not particularly limited and may be 100% by mass.
  • the rubber component preferably contains at least natural rubber among the above-mentioned rubber components. This is because better wear resistance can be obtained.
  • the content of natural rubber in the rubber component is preferably 10% by mass or more, preferably 15% by mass or more, and preferably 30% by mass from the viewpoint of obtaining more excellent wear resistance. % Or more, more preferably 50% by mass or more.
  • the upper limit of the content of the natural rubber is not particularly limited and may be 100% by mass.
  • synthetic diene rubber for example, styrene butadiene rubber (SBR), polybutadiene rubber (BR), isoprene rubber (IR), styrene isoprene butadiene rubber (SIBR), chloroprene rubber (CR), and acrylonitrile butadiene rubber. (NBR) and the like.
  • SBR styrene butadiene rubber
  • BR polybutadiene rubber
  • IR isoprene rubber
  • SIBR styrene isoprene butadiene rubber
  • CR chloroprene rubber
  • NBR acrylonitrile butadiene rubber
  • the synthetic diene rubber may be modified or unmodified. Among these, it is preferable to contain polybutadiene rubber (BR) as the synthetic diene rubber. This is because better wear resistance can be obtained.
  • styrene-butadiene rubber as the synthetic diene rubber.
  • the rubber composition containing styrene-butadiene rubber is applied to the sole of the artificial leg, the flexibility of the rubber is improved and the grip force of the sole can be enhanced, so that higher anti-slip property can be realized.
  • the styrene-butadiene rubber either emulsion polymerization SBR or solution polymerization SBR can be used. Further, a commercially available product can also be used, and can be appropriately selected according to the required performance. Further, the styrene-butadiene rubber may be modified or unmodified.
  • the content of the synthetic diene rubber in the rubber component is preferably 1% by mass or more, more preferably 5% by mass or more, and more preferably 5% by mass or more, from the viewpoint of achieving both anti-slip property and wear resistance at a higher level. , 60% by mass or less, more preferably 50% by mass or less.
  • ethylene propylene diene rubber EPDM
  • ethylene propylene rubber EPM
  • butyl rubber IIR
  • Non-diene rubber can be included.
  • the rubber composition for a prosthesis sole of the present invention further contains a filler in addition to the rubber component described above.
  • a filler in addition to the rubber component described above.
  • the content of the filler needs to be 30 parts by mass or more and less than 50 parts by mass with respect to 100 parts by mass of the rubber component, and 35 parts by mass or more. It is preferably less than 50 parts by mass.
  • the content of the filler By setting the content of the filler to 30 parts by mass or more, it is possible to obtain excellent wear resistance while improving the anti-slip property, while the content of the filler is 100 parts by mass of the rubber component.
  • it is less than 50 parts by mass it is possible to prevent deterioration of other physical properties such as workability and reduce heat generation, so that deterioration of energy loss when applied to a prosthesis sole is suppressed. can do.
  • the filler needs to be at least one selected from carbon black and an inorganic filler, but preferably contains at least carbon black. It is possible to enhance the reinforcement of rubber and obtain better wear resistance when the rubber composition is applied to the sole for artificial legs.
  • the type of carbon black is not particularly limited. For example, any hard carbon produced by the oil furnace method can be used.
  • the type of carbon black is not particularly limited, and for example, carbon black such as GPF, FEF, SRF, HAF, ISAF, IISAF, and SAF grade can be used.
  • the nitrogen adsorption specific surface area (N 2 SA) of the carbon black is preferably 35 to 150 m 2 / g or more.
  • N 2 SA of carbon black is 35 m 2 / g or more, the wear resistance and crack resistance when the rubber composition is applied to the sole for artificial legs can be further improved.
  • N 2 SA of the carbon black is more preferably more preferably not more than 50 ⁇ 150m 2 / g, or less 60 ⁇ 150 m 2 / g. When it is 140 m 2 / g or less, the dispersibility of the carbon black in the rubber composition can be enhanced.
  • the carbon black N 2 SA is obtained by the A method of JIS K 6217-2: 2001 (method of determining specific surface area-nitrogen adsorption method-single point method).
  • the dibutyl phthalate oil absorption amount (DBP oil absorption amount) of the carbon black is preferably 40 to 180 ml / 100 g.
  • DBP oil absorption amount of carbon black is 40 ml / 100 g or more, the wear resistance and crack resistance when the rubber composition is applied to the sole for artificial legs can be further improved, and the DBP oil absorption is 180 ml / 100 g.
  • the DBP oil absorption amount of the carbon black is more preferably 70 to 175 ml / 100 g.
  • the DBP oil absorption amount of the carbon black is determined by JIS K 6217-4: 2008 (how to determine the oil absorption amount).
  • the specific surface area of the carbon black cetyltrimethylammonium bromide is preferably 30 to 200 m 2 / g.
  • CTAB specific surface area of the carbon black is 30 m 2 / g or more, better wear resistance is obtained when the rubber composition is applied to the sole for artificial legs, and the CTAB specific surface area of the carbon black is 200 m 2 When it is / g or less, it is possible to prevent deterioration of energy loss when the rubber composition is applied to the sole for artificial legs.
  • the CTAB specific surface area of the carbon black is more preferably 70 to 175 m 2 / g.
  • the CTAB specific surface area of carbon black can be measured by a method conforming to JIS K 6217-3: 2001 (How to obtain the specific surface area-CTAB adsorption method).
  • the amount of hydrogen released from the carbon black is preferably 0.37% by mass or more.
  • the hydrogen release amount of the carbon black is 0.37% by mass or more, the polymer reinforcing property of the carbon black in the rubber composition can be suitably ensured, and therefore, when the rubber composition is applied to the sole for artificial legs. Better wear resistance is obtained.
  • the amount of hydrogen released from the carbon black is more preferably 0.40% by mass or more.
  • the upper limit of the hydrogen release amount of the carbon black is not particularly limited, but is usually about 0.60% by mass from the viewpoint of ease of production due to device restrictions.
  • the amount of hydrogen released from carbon black is as follows: (1) The carbon black sample is dried in a constant temperature dryer at 105 ° C for 1 hour, cooled to room temperature: 23 ° C in a desiccator, and (2) placed in a tin tubular sample container. Approximately 10 mg is precisely weighed, crimped and sealed, and (3) the amount of hydrogen gas generated when heated at 2000 ° C for 15 minutes under an argon stream using a gas chromatograph device is measured and displayed in% by mass. NS.
  • the content thereof is preferably 30 parts by mass or more and less than 50 parts by mass, and 35 parts by mass or more and less than 50 parts by mass with respect to 100 parts by mass of the rubber component. Is more preferable.
  • the content of the carbon black is set to 30 parts by mass or more with respect to 100 parts by mass of the rubber component, sufficient wear resistance can be obtained when the rubber composition is applied to the sole for artificial legs, and the carbon black
  • the content of the rubber composition is less than 50 parts by mass with respect to 100 parts by mass of the rubber component, a decrease in grip force can be suppressed when the rubber composition is applied to the sole for artificial legs.
  • the inorganic filler is not particularly limited, and can be appropriately selected and used according to the required performance and the like.
  • examples of the inorganic filler include silica, aluminum hydroxide, clay, alumina, talc, mica, kaolin, glass balloon, glass beads, calcium carbonate, magnesium carbonate, magnesium hydroxide, magnesium oxide, titanium oxide, and potassium titanate. , Barium sulfate and the like.
  • Aluminum hydroxide As the aluminum hydroxide, Heidilite (registered trademark, manufactured by Showa Denko) or the like can be used.
  • silica from the viewpoint of obtaining more excellent anti-slip properties.
  • the grip force when the rubber composition is applied to the sole for artificial legs can be enhanced, and the anti-slip property can be further improved.
  • the silica is not particularly limited, and examples thereof include wet silica, colloidal silica, calcium silicate, and aluminum silicate.
  • the silica is preferably wet silica, more preferably precipitated silica. This is because these silicas have high dispersibility and can further improve the low loss property and wear resistance of the rubber composition.
  • Precipitated silica means that the reaction solution is allowed to react in a relatively high temperature, neutral to alkaline pH range at the initial stage of production to grow silica primary particles, and then controlled to the acidic side to aggregate the primary particles. It is the silica obtained as a result of making it.
  • cetyltrimethylammonium bromide adsorption specific surface area is 5 0 ⁇ 300m 2 / g Is preferable.
  • CTAB cetyltrimethylammonium bromide adsorption specific surface area
  • the CTAB is 50 m 2 / g or more, the hardness of the rubber after vulcanization is suppressed from becoming too high, and sufficient anti-slip properties can be obtained.
  • the CTAB is 300 m 2 / g or less, it is possible to obtain sufficient anti-slip properties. , The reinforcing property of rubber can be maintained high, and sufficient wear resistance can be obtained.
  • the CTAB of the silica is more preferably 70 to 250 m 2 / g, and further preferably 80 to 210 m 2 / g.
  • the specific surface area of the cetyltrimethylammonium bromide adsorption can be measured in accordance with JIS K 6430: 2008.
  • the content thereof is preferably 3 parts by mass or more, and more preferably 5 parts by mass or more with respect to 100 parts by mass of the rubber component.
  • the rubber composition for a prosthesis sole of the present invention may further contain a thermoplastic resin in addition to the above-mentioned rubber component and filler. Since the flexibility of the rubber can be increased by containing the thermoplastic resin, when the rubber composition for a prosthesis sole of the present invention is used for the sole of a prosthesis, the grip force is enhanced and more excellent anti-slip property is obtained. be able to.
  • thermoplastic resin is not particularly limited, and various natural resins and synthetic resins can be used. Further, when the rubber composition for a prosthesis sole of the present invention is used for a prosthesis sole, more excellent anti-slip properties can be obtained. It is preferable to use at least one selected from the group consisting of based resins, and it is more preferable to use at least a phenolic resin.
  • the petroleum-based resin is a decomposed oil distillate containing unsaturated hydrocarbons such as olefins and diolefins, which are by-produced together with basic petrochemical raw materials such as ethylene and propylene by, for example, thermal decomposition of naphtha in the petrochemical industry.
  • unsaturated hydrocarbons such as olefins and diolefins
  • basic petrochemical raw materials such as ethylene and propylene by, for example, thermal decomposition of naphtha in the petrochemical industry.
  • C 5 resins a C 5 fraction obtained by thermal cracking of naphtha (co) polymer obtained by aliphatic petroleum resin
  • C 9 resin Naphtha Aromatic petroleum resin
  • C 5 -C 9 resins a partial copolymerizing copolymerized petroleum resin
  • hydrogenated based or dicyclopentadiene-based such as alicyclic compound-based petroleum resin , Styrene, substituted styrene, or styrene-based resin such as a copolymer of styrene and another monomer.
  • the C 5 fraction obtained by thermal cracking of naphtha usually 1-pentene, 2-pentene, 2-methyl-1-butene, 2-methyl-2-butene, 3-methyl-1-olefin such as butene
  • Diolefin hydrocarbons such as hydrocarbons, 2-methyl-1,3-butadiene, 1,2-pentadiene, 1,3-pentadiene and 3-methyl-1,2-butadiene are included.
  • aromatic petroleum resin obtained by C 9 fraction (co) polymerization vinyl toluene, a resin obtained by polymerizing an aromatic carbon atoms 9, indene major monomers, by thermal cracking of naphtha specific examples of the C 9 fraction obtained, alpha-methyl styrene, beta-methyl styrene, .gamma.-methyl styrene homologs and indene such as styrene, indene analogs such as coumarone and the like.
  • Product names include Petrodin manufactured by Mitsui Petrochemical, Petrite manufactured by Mikuni Chemical Co., Ltd., Neopolymer manufactured by Nippon Petrochemicals Co., Ltd., and Petcol made by Toyo Soda.
  • modified petroleum resin modified petroleum resin comprising the C 9 fraction.
  • modified petroleum resin an unsaturated alicyclic compound modified with C 9 petroleum resins, C 9 petroleum resins modified with a compound having a hydroxyl group, C 9 petroleum resins modified with an unsaturated carboxylic acid compound can be mentioned.
  • Examples of the compound having a hydroxyl group include an alcohol compound and a phenol compound.
  • Specific examples of the alcohol compound include alcohol compounds having a double bond such as allyl alcohol and 2-butene-1,4diol.
  • As the phenol compound alkylphenols such as phenol, cresol, xylenol, p-tert-butylphenol, p-octylphenol and p-nonylphenol can be used. These compounds having a hydroxyl group may be used alone or in combination of two or more.
  • the C 9- based petroleum resin having a hydroxyl group is a method of thermally polymerizing a (meth) acrylic acid alkyl ester or the like together with a petroleum distillate to introduce an ester group into the petroleum resin, and then reducing the ester group. It can be produced by a method of hydrating the double bond after the double bond remains or is introduced therein.
  • the C 9 petroleum resin having a hydroxyl group can be used those obtained by the various methods as, Performance, viewed from the manufacturing aspect, it is preferred to use a phenol-modified petroleum resins.
  • the phenol-modified petroleum resins, obtained by cationic polymerization of the C 9 fraction in the presence of phenol, modified is easy and low cost. Examples of the phenol-modified C 9 petroleum resin, for example, Neo polymer -E-130 (manufactured by Nippon Petrochemicals).
  • the modified C 9 petroleum resin with an unsaturated carboxylic acid compound is capable of modifying the C 9 petroleum resin in an ethylenically unsaturated carboxylic acid.
  • ethylenically unsaturated carboxylic acids include (maleic anhydride) maleic acid, fumaric acid, itaconic acid, tetrahydro (anhydrous) futaric acid, (meth) acrylic acid and citraconic acid.
  • Unsaturated carboxylic acid-modified C 9 petroleum resin can be obtained by thermally polymerizing C 9 petroleum resin and ethylenically unsaturated carboxylic acid.
  • maleic acid-modified C 9 petroleum resin is preferable.
  • the unsaturated carboxylic acid-modified C 9 petroleum resin for example, Neo Polymer 160 (manufactured by Nippon Petrochemicals).
  • the C 9 fraction is not particularly limited, but is preferably the C 9 fraction obtained by thermal decomposition of naphtha.
  • Specific examples thereof include TS30, TS30-DL, TS35, and TS35-DL of the Struktor series manufactured by SCHILL & SEILACHER.
  • examples of the coal-based resin include Kumaron inden resin and the like.
  • examples of the phenol-based resin include alkylphenol formaldehyde-based resins and their rosin-modified products, alkylphenol acetylene-based resins, modified alkylphenol resins, terpenephenol resins, and the like, and specifically, hitanol, which is a novolak-type alkylphenol resin. Examples thereof include 1502 (manufactured by Hitachi Kasei Kogyo Co., Ltd.) and choresin (manufactured by BASF), which is a p-tert-butylphenol acetylene resin.
  • C 5 fraction and C 9 fraction copolymer resin obtained by a C 9 fraction (co) polymerizing Group petroleum resins, phenolic resins and Kumaron inden resins are preferred.
  • examples of the rosin-based resin include gum rosin, tall oil rosin, wood rosin, hydrogenated rosin, disproportionated rosin, polymerized rosin, modified rosin glycerin, and pentaerythritol ester.
  • examples of the terpene-based resin include ⁇ -pinene-based, ⁇ -pinene-based, and dipentene-based terpene resins, aromatic-modified terpene resins, terpene phenol resins, and hydrogenated terpene resins.
  • these natural resins polymerized rosin, terpene phenol resin, and hydrogenated terpene resin are preferable from the viewpoint of abrasion resistance of the vulcanized rubber composition.
  • the content of the thermoplastic resin is not particularly limited, but when the rubber composition for the prosthesis sole of the present invention is used for the sole of the prosthesis, more excellent anti-slip property is obtained without lowering the abrasion resistance. From the point of view, it is preferably 5 to 40 parts by mass, more preferably 8 to 35 parts by mass, and particularly preferably 10 to 30 parts by mass with respect to 100 parts by mass of the rubber component. By setting the content of the thermoplastic resin to 5 parts by mass or more with respect to 100 parts by mass of the rubber component, more excellent anti-slip properties can be obtained, and 40 parts by mass or less with respect to 100 parts by mass of the rubber component. By doing so, it is possible to suppress a decrease in wear resistance.
  • the rubber composition for a prosthesis sole of the present invention may contain other components in addition to the above-mentioned rubber component, carbon black and thermoplastic resin to the extent that the effects of the present invention are not impaired.
  • Other components are commonly used in the rubber industry, for example, silane coupling agents, anti-aging agents, cross-linking accelerators, cross-linking agents, cross-linking accelerators, oils, stearic acid, ozone deterioration inhibitors, surfactants and the like. Additives can be appropriately included.
  • silica When silica is contained as the filler, it is preferable to further contain a silane coupling agent. This is because the effects of reinforcing property and low loss property of silica can be further improved.
  • the silane coupling agent known ones can be appropriately used.
  • the content of the preferable silane coupling agent varies depending on the type of the silane coupling agent and the like, but is preferably in the range of 2 to 25% by mass, preferably in the range of 2 to 20% by mass with respect to silica. It is more preferable, and it is particularly preferable that it is 5 to 18% by mass. If the content is less than 2% by mass, the effect as a coupling agent is not sufficiently exhibited, and if it exceeds 25% by mass, gelation of the rubber component may occur.
  • the silane coupling agent is not particularly limited.
  • anti-aging agent known ones can be used and are not particularly limited.
  • a phenol-based anti-aging agent an imidazole-based anti-aging agent, an amine-based anti-aging agent, and the like can be mentioned.
  • These anti-aging agents may be used alone or in combination of two or more.
  • cross-linking accelerator known ones can be used and are not particularly limited.
  • thiazole-based vulcanization accelerators such as 2-mercaptobenzothiazole and dibenzothiazil disulfide; Sulfenamide-based vulcanization accelerator; guanidine-based vulcanization accelerator such as diphenylguanidine; tetramethylthium disulfide, tetraethyl thiuram disulfide, tetrabutyl thiuram disulfide, tetradodecyl thiuram disulfide, tetraoctyl thiuram disulfide, tetrabenzyl thiuram disulfide, disulfide.
  • Thiuram-based vulcanization accelerators such as pentamethylene thiuram tetrasulfide; dithiocarbamate-based vulcanization accelerators such as zinc dimethyldithiocarbamate; zinc dialkyldithiophosphate and the like can be mentioned.
  • the cross-linking agent is also not particularly limited.
  • sulfur, bismaleimide compounds and the like can be mentioned.
  • types of the bismaleimide compound for example, N, N'-o-phenylene bismaleimide, N, N'-m-phenylene bismaleimide, N, N'-p-phenylene bismaleimide, N, N'-( Illustrate 4,4'-diphenylmethane) bismaleimide, 2,2-bis- [4- (4-maleimidephenoxy) phenyl] propane, bis (3-ethyl-5-methyl-4-maleimidephenyl) methane, and the like. Can be done.
  • N, N'-m-phenylene bismaleimide, N, N'-(4,4'-diphenylmethane) bismaleimide and the like can be preferably used.
  • the cross-linking accelerator examples include zinc oxide (ZnO) and fatty acids.
  • the fatty acid may be a saturated or unsaturated, linear or branched fatty acid, and the number of carbon atoms of the fatty acid is not particularly limited. For example, a fatty acid having 1 to 30, preferably 15 to 30 carbon atoms. More specifically, cyclohexaneic acid (cyclohexanecarboxylic acid), naphthenic acid such as alkylcyclopentane having a side chain; hexanic acid, octanoic acid, decanoic acid (including branched carboxylic acid such as neodecanoic acid), dodecanoic acid, tetradecane.
  • ZnO zinc oxide
  • fatty acids may be a saturated or unsaturated, linear or branched fatty acid, and the number of carbon atoms of the fatty acid is not particularly limited. For example, a fatty acid having 1 to 30, preferably 15 to 30 carbon
  • Saturated fatty acids such as acids, hexadecanoic acid and octadecanoic acid (stearic acid); unsaturated fatty acids such as methacrylic acid, oleic acid, linoleic acid and linolenic acid; resin acids such as rosin, tall oil acid and avietic acid. These may be used alone or in combination of two or more. In the present invention, zinc oxide and stearic acid can be preferably used.
  • the oil is mainly used as a softener.
  • the rubber composition for a prosthetic sole of the present invention may be contained within a range that does not reduce the reinforcing property such as wear resistance.
  • Examples of the type of the oil include those conventionally known, and examples thereof include process oils such as aromatic oils, naphthenic oils and paraffin oils, vegetable oils such as coconut oils, and synthetic oils such as alkylbenzene oils.
  • the oil referred to here is an oil added as a softening agent, and does not include the oil contained in the oil spread SBR and the oil unavoidably contained in the rubber composition.
  • the rubber composition for artificial leg sole of the present invention either non-oil-extended SBR or oil-extended SBR can be used as the SBR, but from the viewpoint of maintaining excellent wear resistance, the rubber composition
  • the total amount of oil is preferably 40 parts by mass or less with respect to 100 parts by mass of the rubber component.
  • the method for adjusting the amount of oil in the entire rubber composition is not particularly limited, but for example, it is carried out by adjusting the amount of oil in the oil spread SBR or adjusting the amount of oil as the softening agent described above. Can be done.
  • the sole for artificial legs of the present invention is characterized in that the rubber composition for artificial legs sole of the present invention described above is used.
  • excellent anti-slip property and abrasion resistance can be realized.
  • the prosthesis sole for the present invention can be applied to any prosthesis provided with the sole, but from the viewpoint of more effectively exhibiting the excellent anti-slip property and wear resistance of the present invention, it is for competition. It is preferably attached directly or indirectly to a leaf spring (leaf spring-shaped artificial leg) such as an artificial leg.
  • the sole for artificial legs for the present invention may be composed of only the rubber composition for artificial legs of the present invention described above, but it may be combined with a sole member made of another rubber composition to form one sole for artificial legs. Can also be configured.
  • a configuration in which the members are separated on the toe side and the heel side of the sole for artificial legs can be considered, and the rubber composition of the present invention is preferably arranged on the sole member on the toe side.
  • the rubber to be placed on the heel side sole member when the member is separated between the toe side and the heel side of the artificial leg sole is not particularly limited.
  • a softener, silica, etc. A rubber composition in which the amount of the filler in the above is increased can be used.
  • FIG. 1 is a side view of a competition prosthesis 1 to which the prosthesis sole 5 according to the embodiment of the present invention is attached.
  • the competition prosthesis 1 has a leaf spring-shaped foot portion 2, and a sole 5 is attached to a contact area on the tip end side of the foot portion 2.
  • the base end portion of the foot portion 2 is connected to the socket via an adapter, and can be worn by accommodating the stump of the wearer's foot in the socket.
  • the adapter and socket those corresponding to the stump position of the foot, such as the thigh prosthesis and the lower leg prosthesis, are used.
  • FIG. 1 shows a foot portion 2 and a prosthesis sole 5 in an upright state of a wearer wearing a competition prosthesis 1.
  • the side where the foot 2 is connected to the adapter is referred to as a connection side
  • the side which is in contact with the road surface S is the ground side. That is.
  • the toe T of the competition prosthesis 1 refers to the point where the foot portion 2 extends from the connection side and ends.
  • the direction extending parallel to the road surface S from the toe T is called the prosthesis traveling anteroposterior direction.
  • the direction of the foot 2 over the width direction is referred to as the width direction W.
  • the foot portion 2 of the competition prosthesis 1 has a shape extending in a plate shape toward the toe T side via at least one curved portion, or one curved portion 3 in the illustrated example.
  • the foot portion 2 has a straight portion 2a, a curved portion 2b convex to the toe T side, and a curved portion 3 convex to the rear side in the anterior-posterior direction of the prosthesis, in this order from the connection side to the ground contact side. It is composed of a curved portion 2c that is concave on the grounding side and a grounding portion 4 that extends to the toe T side in an arc shape that is convex on the grounding side.
  • the prosthesis 1 for competition may have a foot portion 2 having a shape other than that shown in FIG. 1 depending on the type of competition and the will of the athlete.
  • the material of the foot portion 2 is not limited, it is preferable to use carbon fiber reinforced plastic or the like from the viewpoint of strength and weight reduction.
  • the ground contact portion 4 of the foot portion has a contact area 4s extending from the toe T to the curved portion 3 side on the ground contact side, and the artificial leg sole 5 is attached to the contact area 4s.
  • the contact area 4s refers to the entire area in contact with the road surface S when the wearer wearing the competition prosthesis 1 performs a straight running motion, and when the sole 5 is attached, the contact area 4s is the sole. It comes into contact with the road surface S via 5.
  • the sole 5 for artificial legs is attached to the contact area 4s via an adhesive, but the attachment means is not limited to the adhesive, and may be attached using a fastener such as a belt.
  • the adhesive is applied so as to cover at least the contact area 4s, but from the viewpoint of ensuring the adhesiveness of the end portion. , It may protrude from the contact area 4s in the direction of the curved portion 2c.
  • the sole 5 is mounted in direct contact with the contact area 4s, but a cushion material (not shown) may be interposed between the sole 5 for artificial legs and the contact area 4s.
  • EVA or urethane resin can be preferably used as the material of the cushion material.
  • the artificial leg sole 5 of the present invention has a sole bottom surface 5s composed of a plurality of irregularities.
  • the sole bottom surface 5s has a shape in which arcs X1 and X2 are continuous from the toe T side to the curved portion 3 side, and the contact area 4s of the foot portion 2. It has a shape according to the extending shape of.
  • the arc X1 and the arc X2 in the contact area 4s of the foot portion 2 have different radii of curvature from each other, but they may have the same radius of curvature, and they may be in contact with each other.
  • the area 4s does not have to have an arc.
  • the sole bottom surface of the prosthesis sole 5 of the present invention (hereinafter, may be referred to as “bottom surface of the prosthesis sole”) 5s is the prosthesis with the competition prosthesis 1 worn and the wearer standing upright.
  • the boundary line CL (see FIGS. 3A and 3B), one of them. It has different performance on the side and the other side.
  • the contact point C between the bottom surface 5s of the artificial leg sole and the road surface S is a point where the wearer first comes into contact with the road surface S when the wearer reaches an upright position.
  • the upright state of the wearer is a healthy foot in which the wearer does not wear the prosthesis when only one of them is a prosthesis, and when both are prostheses, the body is supported by one of the prostheses. It refers to the state in which the vehicle is lowered onto the road surface S and first comes into contact with the road surface S.
  • the contact point C between the bottom surface 5s of the prosthesis sole and the road surface S is determined by the shape of the prosthesis, the mounting mode, and the like. (For example, in the present embodiment, as shown in FIG.
  • the position is located in a region extending in the width direction W from a point of 60% to 70% of the maximum length L1 in the anterior-posterior direction of the prosthesis starting from the toe T of the sole bottom surface 5s. That is, based on the knowledge about the ground contact form obtained by the experiment described later, the boundary line CL of the bottom surface 5s of the artificial toe sole is based on the point C which is the contact point with the road surface S in the upright state of the wearer. It becomes.
  • FIGS. 2A to 2D stepwise explain the operation of the foot portion 2 and the ground contact form of the sole bottom surface 5s when the wearer wearing the competition prosthesis 1 having the above configuration travels straight. It is a figure for doing.
  • the upper part of each drawing is a side view of the foot portion 2 and the sole 5 of the competition prosthesis 1, and the lower part of each drawing is the prosthesis when the wearer wearing the competition prosthesis 1 performs a straight running motion. It shows the transition of the ground contact form of the bottom surface 5s of the sole.
  • FIG. 2A shows a state in which the competition prosthesis 1 lifted by the wearer is lowered onto the road surface S and the entire weight is loaded on the competition prosthesis 1.
  • the curved portion 3 side of the sole bottom surface 5s with respect to the point C is in contact with the ground.
  • FIG. 2B is a diagram showing a state in which the wearer steps on the prosthesis 1 for competition with the entire weight loaded on the prosthesis 1 for competition after FIG. 2A. From FIG. 2B, in the case of running a healthy person, the bottom surface of the sole of the shoe is generally stepped on in order from the heel side to the toe side of the sole.
  • FIG. 2C is a diagram showing a state in which, after FIG. 2B, the wearer swings the foot opposite to the side on which the competition prosthesis 1 is worn forward and starts the kicking motion of the competition prosthesis 1. From FIG. 2C, it can be seen that when the kicking motion is started, the competition prosthesis 1 is in contact with the road surface S on the toe T side of the bottom surface 5s of the prosthesis sole with respect to the point C. Furthermore, FIG.
  • FIG. 2D is a diagram showing a state immediately before takeoff in which the wearer kicks the competition prosthesis 1 away from the road surface S after FIG. 2C. From FIG. 2D, it can be seen that the ground is further grounded on the toe T side of FIG. 2C in order to kick out from the toe T on the bottom surface 5s of the artificial leg sole.
  • the bottom surface 5s of the artificial foot sole is 5s.
  • the line extending in the width direction of the foot through the contact point C between the bottom surface 5s of the sole for the prosthesis and the road surface when the wearer wearing the prosthesis for competition is upright is defined as the boundary line CL. It was divided into a part side Q1 and a toe side Q2.
  • the negative ratio of the curved portion side Q1 with respect to the boundary line CL is 35 to 35 to It is preferable that the ratio is 80% and the negative ratio of the toe side Q2 to the boundary line CL is 55% or less (including 0%).
  • the curved portion side Q1 of the bottom surface 5s of the prosthesis sole is stepped on with the wearer first landing and the total weight is loaded on the competition prosthesis 1. This is the area to do. Therefore, in order to maintain the balance of the entire body even when the wearer loads the entire weight on the competition prosthesis 1, it is important to sufficiently grip the road surface S and realize high anti-slip property.
  • the toe side Q2 of the bottom surface 5s of the sole for the prosthesis is an area for the wearer to swing the foot opposite to the side wearing the prosthesis 1 for competition forward and kick the prosthesis 1 for competition. be.
  • the toe side Q2 is grounded in order toward the toe T, and the wearer pushes the road surface S on the bottom surface 5s of the sole and touches the ground so as to slide, so that the area is particularly prone to wear. Therefore, the toe side Q2 of the bottom surface 5s of the artificial leg sole needs to have higher wear resistance than the curved portion side Q1. Therefore, the negative ratio (35 to 80%) of the curved portion side Q1 is larger than the negative ratio (55% or less) of the toe side Q2 with respect to the boundary line CL, so that the anti-slip property and the wear resistance are improved. Both can be improved.
  • the negative ratio refers to the ratio of the area of the sole bottom surface 5s having unevenness in the plan view to the portion that is concave with respect to the road surface S in the total area in the plan view.
  • the curved portion side Q1 and the toe side Q2 of the bottom surface 5s of the prosthesis sole are further divided into two in the anteroposterior-posterior direction of the prosthesis. Is more preferable.
  • the negative rate of the portion Q1-1 on the toe T side of the center M1 of the maximum length L1 in the anterior-posterior direction of the prosthesis is 40 to 80%.
  • the negative rate of the other part Q1-2 of the curved portion side Q1 is 35 to 60%, and the negative rate of the part Q2-1 located closer to the toe side of the toe side Q2 of the bottom surface 5s of the artificial leg sole is , 0 to 15%, and it is particularly preferable that the negative rate of the portion Q2-2 located on the curved portion side is 25 to 55%.
  • the portion Q1-1 on the toe T side of the center M1 of the maximum length L1 in the anterior-posterior direction of the prosthesis is the area where the wearer first lands. It is necessary to ensure slip prevention in order to balance the above. Therefore, the negative rate is higher and the drainage performance is higher than that of the other part Q1-2 of the curved portion side Q1 of the bottom surface 5s of the prosthesis sole, so that slip is prevented more reliably and the slip is more stable. It is possible to realize running.
  • the portion Q1-2 on the curved portion side of the center M1 of the maximum length L1 in the anteroposterior-posterior direction of the prosthesis is the portion that first touches the ground in the competition prosthesis 1.
  • the ground contact portion has changed to the curved portion 3 side of Q1-1, that is, the side opposite to the traveling direction.
  • the movement of the upper body that the wearer tries to move forward and the movement of the ground contact part are temporarily reversed.
  • the portion Q1-2 has a higher rigidity than the portion Q1-1.
  • the toe side Q2 of the bottom surface 5s of the prosthesis sole corresponds to the arc X1 continuous from the toe T with a constant radius of curvature in FIG.
  • the portion Q2-1 located closer to the toe side is finally grounded when the wearer wearing the competition prosthesis 1 performs a kicking motion. , Prone to more severe wear. Therefore, the portion Q2-1 located closer to the curved portion needs to have particularly high wear resistance. That is, on the toe side Q2 of the bottom surface 5s of the artificial leg sole, the portion Q2-1 has higher wear resistance than the remaining portion Q2-2, thereby protecting the sole 5 from severe wear and extending the service life. It can be effectively prolonged.
  • the specific means for changing the negative ratio described above is not particularly limited, and examples thereof include a method using a pattern composed of irregularities formed by a groove formed on the bottom surface 5s of the artificial leg sole.
  • the case where the gatibu ratio is changed according to the pattern consisting of the unevenness of the bottom surface 5s of the sole will be described below.
  • FIG. 4 is a diagram showing an example of a pattern of the bottom surface 5s of the sole 5 for artificial legs of the present invention.
  • the bottom surface 5s of the prosthesis sole shown in FIG. 4 has a shape in which square corners are rounded in a plan view by forming a concave groove in the sole bottom surface 500s in Q10, and a plurality of land portions 15 are divided. Has been done. Further, in the ground contact region Q10, the land portions 16a and 16b are arranged on the curved portion 3 side of the land portion 15. The land portions 16a and 16b have a shape in which square corners are rounded in a plan view by forming a concave groove in the sole bottom surface 500s, and have a larger area in a plan view than the land portion 15. Further, the land portion 16b has a larger area in a plan view than the land portion 16a.
  • the land portion 17a and 17b having the same shape as the land portion 16a and the land portion 16b are also partitioned on the toe side portion Q2. Further, on the toe T side of the toe side portion Q2 with respect to the land portions 17a and 17b, a land portion 18a having a rectangular shape with rounded corners is formed in a plan view, and the toe T side with respect to the land portion 18a.
  • the semi-land portion 18b is partitioned in such a manner that the depth of the groove gradually decreases toward the toe T side. Further, a plurality of straight grooves 19a and 19b inclined with respect to the width direction W are continuously arranged along the width direction W on the toe T side of the semi-land portion 18b.
  • the straight groove 19a and the straight groove 19b are inclined in opposite directions with respect to the width direction W.
  • the negative ratio of the curved portion side Q1 of the bottom surface 5s of the artificial leg sole is larger than the negative ratio of the toe side Q2 with respect to the boundary line CL.
  • Examples 1-10> Each sample of the rubber composition for artificial sole was prepared under the conditions shown in Table 1. The blending amount of each component is indicated by the amount (parts by mass) with respect to 100 parts by mass of the rubber component. The amount of the rubber component, carbon black, and components other than silica is rounded off to the first decimal place and indicated by one decimal place.
  • Noxeller D manufactured by Ouchi Shinko Kagaku Kogyo Co., Ltd.
  • N-cyclohexyl-2-benzothiazolyl sulphenamide (“Noxeller CZ-G” manufactured by Ouchi Shinko Kagaku Kogyo Co., Ltd.)
  • Noxeller DM-P di- 2-benzothiazolyl disulfide
  • a rubber composition for a prosthesis sole capable of achieving both anti-slip properties and abrasion resistance when used for a prosthesis sole at a high level, and a prosthesis having excellent anti-slip properties and abrasion resistance.
  • a prosthesis sole capable of achieving both anti-slip properties and abrasion resistance when used for a prosthesis sole at a high level, and a prosthesis having excellent anti-slip properties and abrasion resistance.
  • a rubber composition for a prosthesis sole capable of achieving both anti-slip properties and abrasion resistance when used for a prosthesis sole at a high level, and a prosthesis having excellent anti-slip properties and abrasion resistance.

Abstract

Le problème décrit par la présente invention est de fournir une composition de caoutchouc destinée à des semelles de jambe prothétique capable d'améliorer la résistance au glissement et la résistance à l'usure lorsqu'elle est utilisée dans la semelle d'une jambe prothétique.　Afin de résoudre le problème ci-dessus, la présente invention est caractérisée en ce qu'elle comprend : un composant de caoutchouc contenant au moins un type choisi parmi le caoutchouc naturel et le caoutchouc diénique synthétique ; et au moins une charge choisie parmi le noir de carbone et une charge inorganique en une quantité de 30 parties en masse ou plus et moins de 50 parties en masse sur la base de 100 parties en masse du composant de caoutchouc.
PCT/JP2020/002786 2020-01-27 2020-01-27 Composition de caoutchouc destinée à une semelle de jambe prothétique et semelle de jambe prothétique WO2021152664A1 (fr)

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PCT/JP2020/002786 WO2021152664A1 (fr) 2020-01-27 2020-01-27 Composition de caoutchouc destinée à une semelle de jambe prothétique et semelle de jambe prothétique

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PCT/JP2020/002786 WO2021152664A1 (fr) 2020-01-27 2020-01-27 Composition de caoutchouc destinée à une semelle de jambe prothétique et semelle de jambe prothétique

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6102008B2 (ja) * 2011-12-23 2017-03-29 コンパニー ゼネラール デ エタブリッスマン ミシュラン ニトリル‐ブタジエンゴム、オイルおよび樹脂をベースとするゴム組成物を含む靴底
JP2019181088A (ja) * 2018-04-17 2019-10-24 株式会社ブリヂストン 義足用ソール
WO2019203284A1 (fr) * 2018-04-17 2019-10-24 株式会社ブリヂストン Composition de caoutchouc destinée à une semelle de jambe prothétique et semelle de jambe prothétique
JP2020019933A (ja) * 2018-07-24 2020-02-06 株式会社ブリヂストン 義足ソール用ゴム組成物及び義足用ソール

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6102008B2 (ja) * 2011-12-23 2017-03-29 コンパニー ゼネラール デ エタブリッスマン ミシュラン ニトリル‐ブタジエンゴム、オイルおよび樹脂をベースとするゴム組成物を含む靴底
JP2019181088A (ja) * 2018-04-17 2019-10-24 株式会社ブリヂストン 義足用ソール
WO2019203284A1 (fr) * 2018-04-17 2019-10-24 株式会社ブリヂストン Composition de caoutchouc destinée à une semelle de jambe prothétique et semelle de jambe prothétique
JP2020019933A (ja) * 2018-07-24 2020-02-06 株式会社ブリヂストン 義足ソール用ゴム組成物及び義足用ソール

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