WO2020195696A1 - シール材用ゴム組成物およびこれを用いたシール材 - Google Patents
シール材用ゴム組成物およびこれを用いたシール材 Download PDFInfo
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- WO2020195696A1 WO2020195696A1 PCT/JP2020/009615 JP2020009615W WO2020195696A1 WO 2020195696 A1 WO2020195696 A1 WO 2020195696A1 JP 2020009615 W JP2020009615 W JP 2020009615W WO 2020195696 A1 WO2020195696 A1 WO 2020195696A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/16—Ethylene-propylene or ethylene-propylene-diene copolymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/54—Silicon-containing compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/16—Solid spheres
- C08K7/18—Solid spheres inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
- C09K3/1006—Materials in mouldable or extrudable form for sealing or packing joints or covers characterised by the chemical nature of one of its constituents
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
- C09K2200/02—Inorganic compounds
- C09K2200/0204—Elements
- C09K2200/0208—Carbon
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
- C09K2200/02—Inorganic compounds
- C09K2200/0243—Silica-rich compounds, e.g. silicates, cement, glass
- C09K2200/0247—Silica
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
- C09K2200/04—Non-macromolecular organic compounds
- C09K2200/0494—Silicon-containing compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
- C09K2200/06—Macromolecular organic compounds, e.g. prepolymers
- C09K2200/0607—Rubber or rubber derivatives
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
- C09K2200/06—Macromolecular organic compounds, e.g. prepolymers
- C09K2200/0615—Macromolecular organic compounds, e.g. prepolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C09K2200/0617—Polyalkenes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
- C09K2200/06—Macromolecular organic compounds, e.g. prepolymers
- C09K2200/0645—Macromolecular organic compounds, e.g. prepolymers obtained otherwise than by reactions involving carbon-to-carbon unsaturated bonds
Definitions
- the present invention relates to a rubber composition for a sealing material and a sealing material using the same.
- the rubber seal of the equipment used for storing high-pressure hydrogen gas had a problem that the blister phenomenon was likely to occur.
- the blister phenomenon is a phenomenon in which the gas that has permeated the inside of the rubber due to high pressure expands while staying inside the rubber due to the effect of rapid decompression under high temperature, causing the rubber material to burst.
- Patent Document 1 discloses a rubber composition in which silica is blended as a reinforcing material with silicone rubber.
- Patent Document 3 discloses a rubber composition in which carbon black is blended with ethylene-propylene-diene rubber (EPDM).
- EPDM ethylene-propylene-diene rubber
- Patent Document 4 contains an EPDM O-ring containing carbon black and silica
- Patent Document 5 contains carbon black and microsilica. The compounded elastic compound is disclosed.
- An object of the present invention is to provide a rubber composition for a sealing material capable of improving the sealing property of a high-pressure gas at high temperature and low temperature, and a sealing material formed by cross-linking the rubber composition.
- the present invention includes: [1] A rubber composition for a sealing material containing 100 parts by mass of a rubber component, 50 to 140 parts by mass of silica, 1 to 20 parts by mass of a silane coupling agent, and 15 to 35 parts by mass of carbon black. [2] The rubber composition for a sealing material according to [1], wherein the rubber component is ethylene-propylene-diene rubber. [3] The ethylene-propylene-diene rubber has a Moony viscosity at 125 ° C. of 50 to 90 or a Moony viscosity at 100 ° C. of 30 to 60 as measured in accordance with JIS K6300-1: 2013, and is derived from ethylene.
- a rubber composition for a sealing material capable of improving the sealing property of a high-pressure gas at high temperature and low temperature, and a sealing material formed by cross-linking the rubber composition.
- the rubber composition for the sealing material is [A] Rubber component and [B] Silica and [C] Silane coupling agent and [D] Carbon black and including.
- each component contained in the rubber composition for a sealing material and an optional component will be described in detail.
- Rubber component examples include ethylene-propylene-diene rubber (EPDM), ethylene-propylene rubber (EPM), nitrile rubber (NBR; acrylonitrile butadiene rubber), and hydrogenated nitrile rubber (HNBR; hydrogenated acrylonitrile butadiene rubber). ), Butyl rubber (IIR), fluorine rubber (FKM), silicone rubber (Q) and the like can be used. EPDM, HNBR, FKM and the like are preferable because they have good characteristics as a rubber for a sealing material.
- the rubber component may consist of only one type, or may contain two or more types.
- the sealing material obtained by cross-linking the rubber composition for the sealing material does not generate blisters and does not leak gas in the high temperature and high pressure cycle test at a temperature of 100 ° C. and a pressure of 100 MPa, which will be described later. Further, the sealing material obtained by cross-linking the rubber composition for the sealing material does not leak gas in the low temperature and high pressure cycle test at a temperature of ⁇ 40 ° C. and a pressure of 100 MPa, which will be described later. Gas leakage in a low temperature environment usually occurs due to a decrease in shape followability and resilience of the sealing material.
- EPDM is a rubber with excellent low temperature (restorability at low temperature), chemical resistance, cleanliness, etc., and is cheaper than NBR, HNBR, FKM, Q, etc., so it is suitable for sealing materials. It is one of the suitable rubber components.
- EPDM is a ternary copolymer composed of a structural unit derived from ethylene, a structural unit derived from propylene, and a structural unit derived from a diene monomer.
- the rubber properties can be controlled by adjusting the content ratio of the ethylene-derived constituent unit and the propylene-derived constituent unit. For example, increasing the proportion of ethylene-derived constituent units tends to increase the chemical resistance and crystallinity (and thus mechanical strength) of rubber. On the other hand, when the ratio of ethylene-derived constituent units is reduced, the moldability and fluidity of rubber tend to decrease. In order to produce a high-quality molded product (seal material) with better workability by injection molding, it is preferable that the fluidity of the rubber component used is relatively low.
- the content of the ethylene-derived structural unit in EPDM is usually 70% by mass or less, preferably 55% by mass or less, and more preferably 51% by mass or less.
- the content of the ethylene-derived structural unit is in the above range, good fluidity can be imparted to EPDM, and good low temperature property can be imparted to the sealing material.
- the content of the ethylene-derived structural unit in EPDM is usually 40% by mass or more, preferably 45% by mass or more, and more preferably 48% by mass or more.
- EPDM diene monomer constituting EPDM
- ENB 5-ethylidene-2-norbornene
- DCPD dicyclopentadiene
- 1,4-hexadiene (1,4-HD) 1,4-hexadiene
- methyltetrahydroinden 5-methylene-.
- non-conjugated diene monomers such as 2-norbornene, cyclooctadiene and dicyclooctadiene.
- EPDM shows a good cross-linking rate (vulcanization rate) and is also excellent in heat resistance of the obtained sealing material. Therefore, it is preferable to use ENB, 1,4-HD, and particularly for the cross-linking rate. It is more preferable to use ENB because it is excellent.
- the diene monomer only one kind of monomer may be used, or two or more kinds of monomers may be used in combination.
- the content of the diene monomer-derived structural unit in EPDM is usually 1% by mass or more, preferably 2.5% by mass or more, from the viewpoint of enhancing the crosslinking rate and the molding processability of the rubber composition.
- the content of the diene monomer-derived structural unit in EPDM is usually 14% by mass or less, preferably 14% by mass or less, in consideration of the susceptibility to deterioration of the sealing material due to the large amount of double bonds remaining after crosslinking. It is 10% by mass or less, more preferably 5.0% by mass or less.
- the rubber component used in the rubber composition for a sealing material has a Mooney viscosity [ML (1 + 4) 125 ° C.] at 125 ° C. measured in accordance with JIS K6300-1: 2013, preferably 90 or less, and more preferably. It is 85 or less.
- the Mooney viscosity [ML (1 + 4) 125 ° C.] of the rubber component is preferably 40 or more, more preferably 50 or more, and further preferably 75 or more. If the Mooney viscosity is too high, the workability may be poor.
- the rubber component used in the rubber composition for a sealing material has a Mooney viscosity [ML (1 + 4) 100 ° C.] at 100 ° C. measured in accordance with JIS K6300-1: 2013, preferably 60 or less, more preferably. It is 50 or less.
- the Mooney viscosity [ML (1 + 4) 100 ° C.] of the rubber component is preferably 30 or more, more preferably 35 or more, and further preferably 40 or more.
- EPDM preferably has a Mooney viscosity at 125 ° C. of 50-90 or 30-60 at 100 ° C., measured in accordance with JIS K6300-1: 2013, and has 45-55 mass of ethylene-derived building blocks. Including%.
- a sealing material having excellent followability in a lower temperature environment can be obtained.
- Such a sealing material does not leak high-pressure gas at a temperature of ⁇ 40 ° C. even when grease is not used.
- a grease-less sealing material with good sealing performance is highly versatile because the usage environment is not limited, and troubles during maintenance (replacement of sealing material, etc.) are reduced. Further, such a sealing material can seal a high-pressure gas even at a temperature of ⁇ 45 ° C.
- EPDM commercial products include, for example, “EPT” manufactured by Mitsui Chemicals, Inc., “Esplen” manufactured by Sumitomo Chemicals Co., Ltd., “EP” manufactured by JSR Corporation, and Lanxess manufactured by Lanxess. “KELTAN” etc.
- Esplen 5361 "Esplen 501A” or the like, which are manufactured by Sumitomo Chemical Co., Ltd. and have excellent low temperature resilience, can be used.
- the composition for a silica sealing material is highly filled with silica.
- silica By highly filling silica, hydrogen is less likely to enter the inside of the sealing material, so that the blister resistance of the sealing material can be improved. Since silica has a lower hydrogen adsorption property than carbon black, it is more useful to use silica for improving blister resistance.
- silica that is generally used as a filler that exerts a reinforcing effect can be used for general-purpose rubber.
- the silica is not particularly limited, but the heat of dry white carbon and sodium produced by a method of thermally decomposing a halogenated silicic acid or an organic silicon compound, a method of heating and reducing silica sand to air-oxidize vaporized SiO, and the like. Examples thereof include wet white carbon produced by a decomposition method or the like.
- the silica only one type of silica may be used, or two or more types of silica may be used in combination.
- Silica contains at least 70% by mass of silica component (SiO 2 ).
- the specific surface area of silica is preferably 10 to 120 m 2 / g, more preferably 15 to 40 m 2 / g.
- Silica is preferably spherical.
- silica there is an upper limit to the amount of silica that can be blended in the rubber composition for a sealing material, and it has been difficult to highly fill the silica.
- the friction between the silicas is less than that of silica having another shape (for example, chain shape) and the dispersibility is improved. Therefore, the rubber composition for a sealing material is highly filled with silica. Is possible.
- the low temperature property of the sealing material may be lowered, but if the silica is spherical, the low temperature property is unlikely to be lowered. Therefore, it is possible to make it easier to achieve both blister resistance and low temperature resistance of the sealing material.
- the term "spherical" includes not only a true sphere but also a slightly distorted sphere.
- the average particle size of silica is preferably 5 nm to 5 ⁇ m, more preferably 10 nm to 1 ⁇ m, and further preferably 50 nm to 200 nm from the viewpoint of suppressing aggregation and smoothness. If the average particle size of silica is too large, the blister resistance and low temperature resistance of the sealing material may decrease.
- the average particle size can be obtained by, for example, morphological observation using a microscope, measuring the particle size of silica in the observation field of view by image analysis, and calculating the number average of the measured values.
- the content of silica in the rubber composition for a sealing material is 50 to 140 parts by mass, preferably 80 to 140 parts by mass with respect to 100 parts by mass of the rubber component. If the silica content is too high, the low temperature of the sealing material may decrease.
- the rubber composition for a sealing material contains a silane coupling agent for highly filling silica. Since the silane coupling agent has a reactive group that chemically bonds with the inorganic material and a reactive group that chemically bonds with the organic material in the molecule, it has a role as a binder that connects the organic material and the inorganic material that are normally difficult to bond.
- the surface of silica is coated with a silane coupling agent, the surface of silica becomes hydrophobic and aggregation of silica can be prevented.
- silica can be more dispersed and highly filled in the rubber composition for the sealing material, and the blister resistance of the sealing material can be improved.
- the silane coupling agent also improves the blister resistance by increasing the binding force between silica and the rubber component.
- the silane coupling agent is not particularly limited, and examples thereof include vinyl-based, acrylic-based, epoxy-based, mercapto-based, and amino-based silane coupling agents.
- Examples of the vinyl-based silane coupling agent include vinyl trichlorosilane, vinyl trimethoxysilane, and vinyl triethoxysilane.
- Examples of the acrylic silane coupling agent include 3-acryloxypropyltrimethoxysilane.
- Examples of the epoxy-based silane coupling agent include 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropyltrimethoxysilane, and 3-glycidoxypropyl. Examples thereof include methyldiethoxysilane.
- methacryl-based silane coupling agent examples include 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropyldiethoxysilane, and 3-methacryloxypropyltriethoxysilane. These silane coupling agents can be used alone or in admixture of two or more.
- the content of the silane coupling agent in the rubber composition for a sealing material is 1 to 20 parts by mass, preferably 1 to 10 parts by mass with respect to 100 parts by mass of the rubber component.
- the rubber composition for a sealing material contains carbon black. By containing carbon black, the strength and blister resistance of the sealing material can be improved.
- the content of carbon black is 15 to 35 parts by mass with respect to 100 parts by mass of the rubber component. From the viewpoint of retaining the co-crosslinking agent, the content of carbon black is preferably 20 parts by mass or more with respect to 100 parts by mass of the rubber component. However, since carbon black adsorbs hydrogen, blister resistance may decrease if a large amount is added.
- the total content of silica and carbon black is preferably 95 to 140 parts by mass with respect to 100 parts by mass of the rubber component. High filling of fillers such as silica and carbon black improves blister resistance, but if the amount of the filler blended is too large, the rigidity of the sealing material may be too high and the low temperature may be lowered.
- carbon black is preferably spherical.
- the carbon black is closer to a true sphere (the specific surface area is smaller), the carbon black is less likely to aggregate and the low temperature of the rubber composition for the sealing material is less likely to decrease. From the viewpoint of reinforcing property, it is preferable that the particle size of carbon black is small.
- Carbon black may be conductive or non-conductive, and examples thereof include furnace black, channel black, acetylene black, ketjen black, thermal black, and lamp black depending on the manufacturing method. Carbon black may be used alone or in combination of two or more.
- Examples of carbon black include SAF, ISAF, ISAF-HF, ISAF-LS, IISAF-HS, HAF, HAF-HS, HAF-LS, MAF, FEF, FEF-LS, GPF, GPF-HS, GPF-LS.
- Types such as SRF, SRF-HS, SRF-LM, FT, MT can be used. Two or more types of carbon black having different particle sizes may be used.
- the average particle size of carbon black may vary depending on the manufacturer, but for example, SAF is 19 nm, ISAF is 23 nm, HAF is 28 nm, MAF is 38 nm, FEF is 43 nm, GPF is 62 nm, SRF is 66 nm, and FT is. It is 122 nm.
- the rubber composition for a sealing material preferably further contains a co-crosslinking agent.
- the co-crosslinking agent include quinone dioxime, ethylene glycol dimethacrylate, divinylbenzene, diallyl phthalate, triallyl isocyanurate, trimethylolpropane trimethacrylate, trimethylolpropane triacrylate, 1,2-polybutadiene, and methacrylic acid metal salt. Examples thereof include acrylic acid metal salts.
- the co-crosslinking agent only one kind of co-crosslinking agent may be used, or two or more kinds of co-crosslinking agents may be used in combination.
- the content of the co-crosslinking agent in the rubber composition for a sealing material is preferably 1 to 20 parts by mass, and more preferably 1 to 10 parts by mass with respect to 100 parts by mass of the rubber component. In this range, the fluidity and processability of the rubber composition for a sealing material can be improved. In this range, the blister resistance of the crosslinked sealing material can be further improved. If the content of the co-crosslinking agent is too small, the 100% tensile stress of the sealing material may decrease, and if it is too large, the elongation at the time of cutting may be less than 100%, and the low temperature property may decrease.
- the rubber composition for a sealing material may contain components other than the above-mentioned components, if necessary.
- Other ingredients include, for example, fillers other than silica and carbon black (including extender pigments and color pigments), surfactants other than silane coupling agents, antioxidants, vulcanization accelerators, antioxidants, and processing.
- Additives such as auxiliaries (stearic acid, etc.), vulcanization auxiliaries (zinc oxide, etc.), stabilizers, tackifiers, polyhydric alcohols, flame retardants, waxes, lubricants, etc. can be mentioned.
- the additive only one kind of additive may be used, or two or more kinds of additives may be used in combination.
- the content may be an amount usually used in the art.
- Fillers include alumina, zinc oxide, titanium dioxide, clay, talc, diatomaceous earth, barium sulfate, calcium carbonate, magnesium carbonate, calcium oxide, mica, graphite, aluminum hydroxide, aluminum silicate, hydrotalcite, granules or powder. Examples thereof include resin, metal powder, glass powder, and ceramic powder.
- antiaging agent examples include phenol derivatives, aromatic amine derivatives, amine-ketone condensates, benzimidazole derivatives, dithiocarbamic acid derivatives, thiourea derivatives and the like.
- vulcanization accelerator examples include thiuram-based, thiazole-based, sulfenamide-based, thiourea-based, guanidine-based, and dithiocarbamate-based compounds.
- processing aids include thermoplastic resins, liquid rubbers, oils, softeners, internal mold release agents, tackifiers, and the like.
- processing aids include thermoplastic resins, liquid rubbers, oils, softeners, internal mold release agents, tackifiers, and the like.
- fluororesin or its particles may be contained as a filler
- liquid fluororubber may be contained as a processing aid.
- paraffin oil can be contained as a processing aid.
- the content of the processing aid is preferably 0.5 to 5 parts by mass, and more preferably 1.0 to 2.5 parts by mass with respect to 100 parts by mass of the rubber composition for a sealing material.
- the internal mold release agent examples include higher fatty acids, fatty acid esters, fatty acid amides, fluororesins, silicone resins, hydrocarbon resins and the like.
- the content of the internal mold release agent is preferably 0.5 to 5 parts by mass, and more preferably 1.0 to 2.5 parts by mass with respect to 100 parts by mass of the rubber composition for a sealing material. It is a mass part. This is because if it is less than 0.5 parts by mass, the mold release effect is small, and rubber may adhere to the mold and contaminate the mold.
- the rubber composition for a sealing material contains a high-viscosity internal mold release agent, so that the low temperature can be improved without lowering the blister resistance.
- surfactants other than silane coupling agents include nonionic surfactants, and examples of nonionic surfactants include higher alcohols and polyhydric alcohols.
- specific examples of polyhydric alcohols include, for example, diethylene glycol.
- Organic peroxides used in EPDM and H-NBR include, for example, 2,5-dimethyl-2,5-di-t-butyl-peroxyhexane-3, di-t-butyl peroxide, 2,5.
- the content of the cross-linking agent in the rubber composition for a sealing material is usually 0.1 to 20 parts by mass, preferably 0.2 to 10 parts by mass with respect to 100 parts by mass of the rubber component. Within this range, the cross-linking reaction can proceed sufficiently, so that it is possible to obtain a cushioning material having excellent hardness, mechanical strength, compression set resistance, etc., and also having excellent impact resistance. ..
- the rubber composition for a sealing material contains an excessive amount of filler in order to improve blister resistance, the hardness tends to increase, the elongation decreases, and the sealing material tends to become brittle.
- the inclusion of a plasticizer improves these properties and also improves low temperature.
- the plasticizer component is likely to be deposited on the surface of the molded product, or the plasticizer component is easily extracted by a lubricant such as grease. As a result, the volume may be reduced, the low temperature and heat resistance may be lowered, and the sealing property may be lowered. From this point of view, the rubber composition for a sealing material preferably does not contain a plasticizer.
- the rubber composition for a sealing material can be prepared by uniformly kneading the above-mentioned components.
- a conventionally known kneading machine such as a mixing roll, a pressure kneader, and an internal mixer (Banbury mixer) can be used.
- the components excluding the components contributing to the cross-linking reaction cross-linking accelerator, cross-linking retarder, cross-linking agent, etc.
- the kneading temperature is, for example, around room temperature.
- the sealing material is made of a crosslinked product of the above-mentioned rubber composition for a sealing material.
- the sealing material can be produced by cross-linking (vulcanizing) and molding a rubber composition for a sealing material.
- cross-linking / molding method conventionally known methods such as injection molding, compression molding, and transfer molding can be adopted.
- the heating temperature (crosslinking temperature) at the time of molding is, for example, about 100 to 200 ° C., and the heating time (crosslinking time) is, for example, about 0.5 to 120 minutes.
- HNBR, EPDM, CR, FKM, or VMQ is used as the rubber component, it is preferable to perform secondary vulcanization.
- the sealing material can be packing, gasket, etc.
- the shape of the sealing material is appropriately selected according to its application, and a typical example thereof is an O-ring having an O-shaped cross section. Since the sealing material is excellent in low temperature and blister resistance, it can be suitably used as a sealing material for, for example, a storage tank for high-pressure hydrogen gas stored at 80 MPa. Further, when not only hydrogen gas but also oxygen gas, nitrogen gas, helium gas and the like are used as the storage high pressure gas, the sealing material can be preferably used.
- a dumbbell-shaped No. 3 test piece was die-cut according to JIS K6251: 2017 from a sheet-shaped physical property evaluation sample prepared to a thickness of 2 mm according to JIS K6250: 2006. This test piece was pulled at 500 mm / min, and the tensile strength, elongation at cutting, and 100% tensile stress were measured using a shopper type tensile tester. Further, according to JIS K6253: 2012, the hardness of the sheet-shaped physical property evaluation sample was measured with a type A durometer hardness tester. All of these tests were performed at a temperature of 25 ° C.
- the details of the formulations in Table 3 are as follows.
- the unit of blending amount in the table is parts by mass.
- Rubber component A Esprene 5361 (manufactured by Sumitomo Chemical Industry Co., Ltd., EPDM: Constituent unit derived from ethylene-derived structural unit content of 49% by mass, diene monomer 5-ethylidene-2-norbornene (ENB) The content of is 3.5% by mass, and the Mooney viscosity [ML (1 + 4) 125 ° C.] at 125 ° C.
- Rubber component B Esprene 501A (manufactured by Sumitomo Chemical Industry Co., Ltd., EPDM: Constituent unit derived from ethylene-derived constituent unit content of 52% by mass, diene monomer 5-ethylidene-2-norbornene (ENB) The content of is 4.0% by mass, and the Mooney viscosity [ML (1 + 4) 100 ° C.] at 100 ° C.
- Vulcanization aid Zinc oxide 2 types (manufactured by HakusuiTech Co., Ltd.)
- Anti-aging agent Nocrack 224S (manufactured by Ouchi Shinko Kagaku Kogyo Co., Ltd., 2,2,4trimethyl1,2 dihydroquinoline copolymer)
- Processing aid Lunac S50V (manufactured by Kao Corporation, stearic acid)
- Carbon Black Seest GSO (manufactured by Tokai Carbon Co., Ltd., Furness Black)
- Silica sidistar (manufactured by Elkem, spherical silica, BET surface area 20 m 2 / g, CTAB adsorption specific surface area 30 m 2 / g, DBP absorption amount 85 g / 100 g, average particle size 150 nm)
- Silane coupling agent KBM
- a rubber composition for a sealing material containing 50 to 140 parts by mass of silica, 1 to 20 parts by mass of a silane coupling agent, and 15 to 35 parts by mass of carbon black with respect to 100 parts by mass of a rubber component.
- the crosslinked seal test samples of Examples 1 to 3 did not show cracks in the sample cross section even when exposed to a high temperature and high pressure environment, and were excellent in blister resistance. Further, since no gas leakage was confirmed in a high temperature and high pressure environment, it was found that the seal test samples of Examples 1 to 3 were excellent in sealing property at high temperature. When the seal test samples of Examples 1 to 3 were tested by applying grease in a low temperature and high pressure environment, no gas leakage was confirmed and the sealability at low temperature was excellent.
- Comparative Examples 1, 2 and 4 had 100% lower tensile stress than Examples 1 or 2, and the seal test sample had blisters in the high temperature and high pressure cycle test.
- the hardness of the sample for physical property evaluation of Comparative Example 3 increased, the tensile strength and the elongation at the time of cutting decreased, and the sample for the seal test generated blister in the high temperature and high pressure cycle test and also decreased the low temperature. It was.
- the details of the formulations in Table 4 are as follows.
- the unit of blending amount in the table is parts by mass.
- Rubber component B Esprene 501A (manufactured by Sumitomo Chemical Industry Co., Ltd., EPDM: Constituent unit derived from ethylene-derived constituent unit content of 52% by mass, diene monomer 5-ethylidene-2-norbornene (ENB) The content of is 4.0% by mass, and the Mooney viscosity [ML (1 + 4) 100 ° C.] at 100 ° C.
- Vulcanization aid Zinc oxide 2 types (manufactured by HakusuiTech Co., Ltd.)
- Anti-aging agent Nocrack 224S (manufactured by Ouchi Shinko Kagaku Kogyo Co., Ltd., 2,2,4trimethyl1,2 dihydroquinoline copolymer)
- Processing aid Lunac S50V (manufactured by Kao Corporation, stearic acid)
- Carbon black Seest GSO (manufactured by Tokai Carbon Co., Ltd., furnace black)
- Silica A sidestar (manufactured by Elkem, spherical silica, BET surface area 20 m 2 / g, CTAB adsorption specific surface area 30 m 2 / g, DBP absorption amount 85 g / 100 g, average particle size 150 nm)
- Silica B Aerosil 200 (manufactured by Elkem, spherical silica, BET surface area 20 m 2
- Example 2 the sample for physical property evaluation of Reference Example 1 containing silica B instead of silica A has increased hardness, decreased tensile strength and elongation at cutting, and is inferior in blister resistance. It is expected that. Further, as compared with Example 2, the sample for physical property evaluation of Reference Example 2 containing the co-crosslinking agent B instead of the co-crosslinking agent A has a 100% reduction in tensile stress and is inferior in blister resistance and low temperature resistance. It is expected that.
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Abstract
Description
[1] ゴム成分100質量部と、シリカを50~140質量部と、シランカップリング剤を1~20質量部と、カーボンブラックを15~35質量部とを含む、シール材用ゴム組成物。
[2] 前記ゴム成分は、エチレン-プロピレン-ジエンゴムである、[1]に記載のシール材用ゴム組成物。
[3] 前記エチレン-プロピレン-ジエンゴムは、JIS K6300-1:2013に準拠して測定される125℃におけるムーニー粘度が50~90または100℃におけるムーニー粘度が30~60であり、エチレン由来の構成単位を45~55質量%含む、[2]に記載のシール材用ゴム組成物。
[4] 前記シリカは球状である、[1]~[3]のいずれかに記載のシール材用ゴム組成物。
[5] 前記シリカの平均粒径は5nm~5μmである、[1]~[4]のいずれかに記載のシール材用ゴム組成物。
[6] 可塑剤を含まない、[1]~[5]のいずれかに記載のシール材用ゴム組成物。
[7] [1]~[6]のいずれかに記載のシール材用ゴム組成物の架橋物からなるシール材。
〔A〕ゴム成分と、
〔B〕シリカと、
〔C〕シランカップリング剤と、
〔D〕カーボンブラックと、
を含む。以下、シール材用ゴム組成物が含有する各成分および任意で含有される成分について詳細に説明する。
ゴム成分としては、例えばエチレン-プロピレン-ジエンゴム(EPDM)、エチレン-プロピレンゴム(EPM)、ニトリルゴム(NBR;アクリロニトリルブタジエンゴム)、水素添加ニトリルゴム(HNBR;水素添加アクリロニトリルブタジエンゴム)、ブチルゴム(IIR)、フッ素ゴム(FKM)、シリコーンゴム(Q)等を用いることができる。シール材用のゴムとして良好な特性を兼ね備えていることから、EPDM、HNBR、FKM等が好ましい。ゴム成分は1種のみからなっていてもよいし、2種以上を含んでいてもよい。
シール材用組成物にはシリカが高充填されている。シリカを高充填することで、シール材の内部に水素が侵入しにくくなるため、シール材の耐ブリスター性を向上させることができる。シリカはカーボンブラックよりも水素吸着性が低いため、耐ブリスター性の向上にはシリカを用いることがより有用である。
シール材用ゴム組成物は、シリカを高充填させるためのシランカップリング剤を含む。シランカップリング剤は分子中に、無機質材料と化学結合する反応基と有機質材料と化学結合する反応基をもつため、通常では結合しにくい有機質材料と無機質材料とを結ぶバインダーとしての役割をもつ。シリカの表面をシランカップリング剤で被覆すると、シリカの表面が疎水性となり、シリカの凝集を防ぐことができる。これにより、シール材用ゴム組成物中でシリカをより分散して高充填させることが可能となり、シール材の耐ブリスター性を向上させることができる。また、シランカップリング剤はシリカとゴム成分との結合力を上昇させることでも、耐ブリスター性を向上させる。
シール材用ゴム組成物はカーボンブラックを含む。カーボンブラックを含有することで、シール材の強度および耐ブリスター性を向上させることができる。
シール材用ゴム組成物は、さらに共架橋剤を含むことが好ましい。共架橋剤としては、例えばキノンジオキシム、エチレングリコールジメタクリレート、ジビニルベンゼン、ジアリルフタレート、トリアリルイソシアヌレート、トリメチロールプロパントリメタクリレート、トリメチロールプロパントリアクリレート、1,2-ポリブタジエン、メタクリル酸金属塩、アクリル酸金属塩等が挙げられる。共架橋剤としては、1種の共架橋剤のみを用いてもよいし、2種以上の共架橋剤を併用してもよい。
シール材用ゴム組成物は、必要に応じて、上述の成分以外の他の成分を含有することができる。他の含有成分としては、例えば、シリカおよびカーボンブラック以外のフィラー(体質顔料および着色顔料を含む)、シランカップリング剤以外の界面活性剤、老化防止剤、加硫促進剤、酸化防止剤、加工助剤(ステアリン酸等)、加硫助剤(酸化亜鉛等)、安定剤、粘着付与剤、多価アルコール、難燃剤、ワックス類、滑剤等の添加剤を挙げることができる。添加剤としては、1種の添加剤のみを用いてもよいし、2種以上の添加剤を併用してもよい。
シール材用ゴム組成物は、上述の含有成分を均一に混練りすることにより調製できる。混練り機としては、例えば、ミキシングロール、加圧ニーダー、インターナルミキサー(バンバリーミキサー)等の従来公知の混練り機を用いることができる。この際、各配合成分のうち、架橋反応に寄与する成分(架橋促進剤、架橋遅延剤、架橋剤等)を除く成分を先に均一に混練しておき、その後、架橋反応に寄与する成分を混練するようにしてもよい。混練り温度は、例えば常温付近である。
シール材は、上述のシール材用ゴム組成物の架橋物からなる。シール材は、シール材用ゴム組成物を架橋(加硫)・成形することにより作製することができる。架橋・成形方法は、インジェクション成形、圧縮成形、移送成形等の従来公知の方法を採用することができる。
JIS K6250:2006に従い、2mmの厚さに作製したシート状の物性評価用試料から、JIS K6251:2017に従い、ダンベル状3号型試験片を型抜きした。この試験片を、500mm/分で引張し、引張強さ、切断時伸び、100%引張応力をショッパー式引張試験機を用いて測定した。また、JIS K6253:2012に従い、タイプAデューロメータ硬さ試験機にてシート状の物性評価用試料の硬度を測定した。これらの試験はすべて温度25℃で行った。
Oリングに成形したシール試験用試料をフランジにセットし、表1に示す条件でサイクル試験を行い、耐ブリスター性の評価を行った。サイクル試験後、Oリングの断面を観察し、破損が見られたシール材を「B」とし、亀裂が見られなかったシール材を「A」として評価した。また、表1に示す条件で、ガス漏れの有無を検出した。ガス漏れが検出されたシール材を「B」とし、ガス漏れが検出されなかったシール材を「A」として評価した。
Oリングに成形したシール試験用試料をフランジにセットし、表2に示す条件でサイクル試験を行った。試験後、Oリングの断面を観察し、破損が見られたシール材を「B」とし、亀裂が見られなかったシール材を「A」として評価した。また、表2に示す条件で、ガス漏れの有無を検出した。試験は、シール部にグリース(信越化学工業株式会社製、シリコーングリース、KF-96H-100万cSt)を塗布して、または塗布せずに行った。ガス漏れが検出されたシール材を「B」とし、ガス漏れが検出されなかったシール材を「A」として評価した。
表3に記載された各成分を10L加圧ニーダーで混練し、実施例および比較例のシール材用ゴム組成物を調製した。得られたシール材用ゴム組成物を温度160~180℃に加熱された金型に投入し、加圧プレスにて成形した。成形時間は5~20分であった。さらに温度160~180℃で0.5~2時間二次加硫し、物性評価用試料およびシール試験用試料を得た。
〔1〕ゴム成分A:エスプレン 5361(住友化学工業株式会社製、EPDM:エチレン由来の構成単位の含有量が49質量%、ジエンモノマーである5-エチリデン-2-ノルボルネン(ENB)由来の構成単位の含有量が3.5質量%であり、JIS K6300-1に準拠して測定される125℃におけるムーニー粘度〔ML(1+4)125℃〕が83である。)
〔2〕ゴム成分B:エスプレン 501A(住友化学工業株式会社製、EPDM:エチレン由来の構成単位の含有量が52質量%、ジエンモノマーである5-エチリデン-2-ノルボルネン(ENB)由来の構成単位の含有量が4.0質量%であり、JIS K6300-1に準拠して測定される100℃におけるムーニー粘度〔ML(1+4)100℃〕が44である。)
〔3〕加硫助剤:酸化亜鉛2種(ハクスイテック株式会社製)
〔4〕老化防止剤:ノクラック224S(大内新興化学工業株式会社製、2,2,4トリメチル1,2ジヒドロキノリン共重合体)
〔5〕加工助剤:ルナックS50V(花王株式会社製、ステアリン酸)
〔6〕カーボンブラック:シーストGSO(東海カーボン株式会社製、ファーネスブラック)
〔7〕シリカ:sidistar(Elkem製、球状シリカ、BET表面積20m2/g、CTAB吸着比表面積30m2/g、DBP吸収量85g/100g、平均粒径150nm)
〔8〕シランカップリング剤:KBM1003(信越化学工業株式会社製、ビニルトリメキシシラン)
〔9〕多価アルコール:ジエチレングリコール(株式会社日本触媒製)
〔10〕共架橋剤:ハイクロスM(精工化学株式会社製、トリメチロールプロパントリメタクリレート)
〔11〕架橋剤A:硫黄(鶴見化学株式会社製、コロイド硫黄)
〔12〕架橋剤B:パーカドックス14-40(化薬アクゾ株式会社製、ビス(tert-ブチルジオキシイソプロピル)ベンゼン40%希釈物、有機過酸化物)
実施例1と同様の方法により、表4に従って参考例1および2のシール材用ゴム組成物を調製し、物性評価用試料を得た。物性評価用試料の常態物性を上記評価方法に従って測定した。結果を表4に示す。
〔1〕ゴム成分B:エスプレン 501A(住友化学工業株式会社製、EPDM:エチレン由来の構成単位の含有量が52質量%、ジエンモノマーである5-エチリデン-2-ノルボルネン(ENB)由来の構成単位の含有量が4.0質量%であり、JIS K6300-1に準拠して測定される100℃におけるムーニー粘度〔ML(1+4)100℃〕が44である。)
〔2〕加硫助剤:酸化亜鉛2種(ハクスイテック株式会社製)
〔3〕老化防止剤:ノクラック224S(大内新興化学工業株式会社製、2,2,4トリメチル1,2ジヒドロキノリン共重合体)
〔4〕加工助剤:ルナックS50V(花王株式会社製、ステアリン酸)
〔5〕カーボンブラック:シーストGSO(東海カーボン株式会社製、ファーネスブラック)
〔6〕シリカA:sidistar(Elkem製、球状シリカ、BET表面積20m2/g、CTAB吸着比表面積30m2/g、DBP吸収量85g/100g、平均粒径150nm)
〔7〕シリカB:アエロジル200(日本アエロジル製、BET表面積200m2/g、親水性ヒュームドシリカ、平均粒径7~40nm)
〔8〕シランカップリング剤:KBM1003(信越化学工業株式会社製、ビニルトリメキシシラン)
〔9〕多価アルコール:ジエチレングリコール(株式会社日本触媒製)
〔10〕共架橋剤A:ハイクロスM(精工化学株式会社製、トリメチロールプロパントリメタクリレート)
〔11〕共架橋剤B:TAIC(日本化成株式会社製、トリアリルイソシアヌレート)
〔12〕架橋剤A:硫黄(鶴見化学株式会社製、コロイド硫黄)
〔13〕架橋剤B:パーカドックス14-40(化薬アクゾ株式会社製、ビス(tert-ブチルジオキシイソプロピル)ベンゼン40%希釈物、有機過酸化物)
Claims (7)
- ゴム成分100質量部と、シリカを50~140質量部と、シランカップリング剤を1~20質量部と、カーボンブラックを15~35質量部とを含む、シール材用ゴム組成物。
- 前記ゴム成分は、エチレン-プロピレン-ジエンゴムである、請求項1に記載のシール材用ゴム組成物。
- 前記エチレン-プロピレン-ジエンゴムは、JIS K6300-1:2013に準拠して測定される125℃におけるムーニー粘度が50~90または100℃におけるムーニー粘度が30~60であり、エチレン由来の構成単位を45~55質量%含む、請求項2に記載のシール材用ゴム組成物。
- 前記シリカは球状である、請求項1~3のいずれか1項に記載のシール材用ゴム組成物。
- 前記シリカの平均粒径は5nm~5μmである、請求項1~4のいずれか1項に記載のシール材用ゴム組成物。
- 可塑剤を含まない、請求項1~5のいずれか1項に記載のシール材用ゴム組成物。
- 請求項1~6のいずれか1項に記載のシール材用ゴム組成物の架橋物からなるシール材。
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| KR1020217033850A KR102923966B1 (ko) | 2019-03-26 | 2020-03-06 | 시일재용 고무 조성물 및 이것을 사용한 시일재 |
| US17/442,194 US12264236B2 (en) | 2019-03-26 | 2020-03-06 | Rubber composition for sealing material and sealing material using the same |
| EP20776301.2A EP3950818A4 (en) | 2019-03-26 | 2020-03-06 | RUBBER COMPOSITION FOR GASKET MATERIAL AND GASKET MATERIAL USING THEM |
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| JP6190607B2 (ja) * | 2012-03-30 | 2017-08-30 | 住友理工株式会社 | 燃料電池シール体 |
| WO2013147020A1 (ja) | 2012-03-30 | 2013-10-03 | 東海ゴム工業株式会社 | ゴム組成物および燃料電池シール体 |
| US11326665B2 (en) * | 2016-05-23 | 2022-05-10 | Mitsuboshi Belting Ltd. | Transmission belt |
| CN107805480A (zh) * | 2017-11-15 | 2018-03-16 | 四川科立鑫新材料有限公司 | 一种硅酮耐候密封胶 |
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2019
- 2019-03-26 JP JP2019058270A patent/JP7306844B2/ja active Active
-
2020
- 2020-03-06 EP EP20776301.2A patent/EP3950818A4/en active Pending
- 2020-03-06 KR KR1020217033850A patent/KR102923966B1/ko active Active
- 2020-03-06 WO PCT/JP2020/009615 patent/WO2020195696A1/ja not_active Ceased
- 2020-03-06 CN CN202080024501.7A patent/CN113646377B/zh active Active
- 2020-03-06 US US17/442,194 patent/US12264236B2/en active Active
- 2020-03-25 TW TW109109994A patent/TW202100706A/zh unknown
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| JP2011153220A (ja) * | 2010-01-27 | 2011-08-11 | Sumitomo Rubber Ind Ltd | インナーライナー用ゴム組成物及び空気入りタイヤ |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024135527A1 (ja) * | 2022-12-22 | 2024-06-27 | 株式会社バルカー | 高圧水素ガス用シール材組成物 |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20210140748A (ko) | 2021-11-23 |
| US20220186010A1 (en) | 2022-06-16 |
| JP7306844B2 (ja) | 2023-07-11 |
| TW202100706A (zh) | 2021-01-01 |
| EP3950818A1 (en) | 2022-02-09 |
| CN113646377B (zh) | 2025-06-27 |
| CN113646377A (zh) | 2021-11-12 |
| JP2020158602A (ja) | 2020-10-01 |
| US12264236B2 (en) | 2025-04-01 |
| EP3950818A4 (en) | 2022-12-28 |
| KR102923966B1 (ko) | 2026-02-05 |
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