WO2015159818A1 - ゴム-金属積層ガスケット素材 - Google Patents
ゴム-金属積層ガスケット素材 Download PDFInfo
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- WO2015159818A1 WO2015159818A1 PCT/JP2015/061239 JP2015061239W WO2015159818A1 WO 2015159818 A1 WO2015159818 A1 WO 2015159818A1 JP 2015061239 W JP2015061239 W JP 2015061239W WO 2015159818 A1 WO2015159818 A1 WO 2015159818A1
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- rubber
- gasket material
- metal laminate
- laminate gasket
- gas
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F11/00—Arrangements of sealings in combustion engines
- F02F11/002—Arrangements of sealings in combustion engines involving cylinder heads
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B1/00—Layered products having a general shape other than plane
- B32B1/08—Tubular products
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/06—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of natural rubber or synthetic rubber
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/18—Layered products comprising a layer of metal comprising iron or steel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B25/00—Layered products comprising a layer of natural or synthetic rubber
- B32B25/14—Layered products comprising a layer of natural or synthetic rubber comprising synthetic rubber copolymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B25/00—Layered products comprising a layer of natural or synthetic rubber
- B32B25/18—Layered products comprising a layer of natural or synthetic rubber comprising butyl or halobutyl rubber
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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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
-
- 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
- C09K3/1009—Fluorinated polymers, e.g. PTFE
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
- C23C16/26—Deposition of carbon only
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/20—Inorganic coating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/536—Hardness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2581/00—Seals; Sealing equipment; Gaskets
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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
- C09K2003/1087—Materials or components characterised by specific uses
- C09K2003/1096—Cylinder head gaskets
-
- 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
- C09K2200/0612—Butadiene-acrylonitrile rubber
Definitions
- the present invention relates to a rubber-metal laminate gasket material. More particularly, the present invention relates to a rubber-metal laminated gasket material suitably used as, for example, a cylinder head gasket or the like.
- rubber metal laminates have been used for cylinder head gaskets of engines.
- the rubber-metal laminate one obtained by coating and laminating a rubber composition on a metal plate is used, but when such a rubber surface is not subjected to any surface treatment is used.
- the applicant has first coated the fluororubber surface with a surface treatment agent comprising a hydroxyl group-containing substance of liquid polybutadiene, a polybutadiene isocyanate group-containing substance as the curing agent thereof, and a polyolefin resin organic solvent dispersion. It is proposed (patent document 1).
- the wear resistance at normal temperature is good, the wear resistance tends to decrease after thermal aging, and for applying to gasket applications used in a high temperature environment, a further function Improvement is expected.
- Patent Document 2 discloses that a DLC (Diamond like carbon) film having wear resistance and lubricity is formed by a plasma CVD method on the surface on which a film made of an organic material of a substrate of a sealing material for automobiles is to be formed.
- fluorine or hydrogen termination is required as a pretreatment for forming a DLC film, which is said to improve the adhesion between the carbon film and the sealing material substrate.
- Patent Document 3 also proposes that a carbon interlayer film be formed between a polymer substrate and a DLC film as a technique for forming a DLC film excellent in adhesion on the surface of the polymer substrate, It is shown as Comparative Example 1 that the DLC film peels off when such an intermediate layer film is not formed.
- An object of the present invention is to provide a rubber-metal laminated gasket material in which a fluorine rubber or a nitrile rubber is laminated on a metal plate, which has reduced wear and abrasion due to friction with a seal mating surface under high temperature use. is there.
- the object of the present invention is to provide plasma CVD in which high frequency power is supplied from a high frequency power source using an unsaturated hydrocarbon gas to the outer surface of the rubber layer of a rubber-metal laminate gasket material in which fluorine rubber or nitrile rubber is laminated on a metal plate.
- the rubber-metal laminate gasket material according to the present invention preferably has a nanoindentation hardness of 10 GPa or more on a silicon wafer, which is formed by plasma CVD using unsaturated hydrocarbon gas on the outer surface of the rubber layer.
- amorphous carbon film having a thickness of 15 GPa or more and a film thickness of 200 nm or more, preferably 400 nm or more, fluorine gas, hydrogen gas and the like before formation of the amorphous carbon film as described in Patent Document 2
- the coefficient of friction is reduced at normal temperature and the wear resistance is improved regardless of the presence or absence of the end treatment using.
- the film composition is carbon, there is no heat deterioration as in the case of a polymer coat, so that it is possible to improve the abrasion resistance under high temperature environment and reduce the adhesion under high temperature conditions. It produces excellent effects.
- the rubber-metal laminated gasket material having such characteristics is suitably used as a cylinder head gasket of an engine or the like.
- a stainless steel plate As the metal plate, a stainless steel plate, a mild steel plate, an aluminum plate, an aluminum die-cast plate or the like is used, and preferably, a stainless steel plate such as SUS304, SUS301, SUS301H, or SUS430 is used.
- the thickness of the sheet is generally about 0.1 to 2 mm because it is used for a gasket.
- an adhesive layer is generally formed on the metal plate.
- Any adhesive can be used without particular limitation as long as it can bond rubber.
- a commercially available product Lordfur East product Chemlock AP-133, Toyo Chemical Laboratory product Metalloc S-2, Rohm and Roam
- a silane-based adhesive for fluorine rubber such as Haems product Megam 3290-1 or a silane-based adhesive containing an organic metal compound is used.
- the adhesive is preferably applied on a degreased metal plate by spraying, brushing, roll coating, etc. to a coating weight of about 10 to 1,000 mg / m 2 and dried at room temperature. Thereafter, it is baked at about 100 to 250 ° C. for about 1 to 20 minutes.
- top coat adhesive comprising novolac epoxy resin, novolac phenol resin derived from p-unsubstituted phenol, and 2-ethyl-4-methylimidazole is combined. Or the like (see Patent Documents 4 to 6), and when nitrile rubber is used as the rubber, it is generally a commercially available product such as, for example, Metalok N31 manufactured by Toyo Chemical Laboratory Co., Ltd. product Sixon 715 manufactured by Rohm and Haas. Phenolic resin-based adhesives such as Loadfert East's products Chemlock TS 1677-13, Chemlock 202, etc. are applied as a top coat adhesive. These top coat adhesives are applied with a film thickness of about 1 to 15 ⁇ m, and are subjected to the same drying and baking treatment as the adhesive applied directly on the metal plate.
- the metal plate and the rubber can be adhered by adding the above-mentioned adhesive component to the solvent solution of the rubber compound without particularly forming the adhesive layer, and the content of the composition is particularly limited.
- a fluororubber compound to which the adhesive component of Formulation Example I as described later is added is shown.
- the fluorororubber either polyol crosslinkability or peroxide crosslinkability can be used, and the resulting rubber layer has a hardness (durometer A; instantaneous) of 80 or more (JIS K6253 corresponding to ISO 48: 1997), compression It is sufficient if the permanent strain (100 ° C., 22 hours) is 50% or less (JIS K6262 corresponding to ISO 815: 2006), and the content of the composition is not particularly limited.
- the fluororubber compounds of Examples II-IV are shown.
- Polyol-crosslinkable fluororubbers generally include vinylidene fluoride and other fluorinated olefins such as hexafluoropropene, pentafluoropropene, tetrafluoroethylene, trifluorochloroethylene, vinyl fluoride, perfluoro (methyl vinyl ether) and the like. Both copolymers and copolymers of a fluorine-containing olefin and propylene and the like can be mentioned, and these fluororubbers are polyol-crosslinked by a polyol-based crosslinking agent and a crosslinking accelerator.
- polyol crosslinking agents examples include 2,2-bis (4-hydroxyphenyl) propane [bisnol A], 2,2-bis (4-hydroxyphenyl) perfluoropropane [bisphenol AF], bis (4-hydroxyphenyl) ) Sulfone [bisphenol S], 2,2-bis (4-hydroxyphenyl) methane [bisphenol F], bisphenol A-bis (diphenylphosphate), 4,4'-dihydroxydiphenyl, 2,2-bis (4-hydroxy) Examples thereof include phenyl) butane and the like, preferably bisphenol A, bisphenol AF and the like. They may also be in the form of alkali metal salts or alkaline earth metal salts. These polyol crosslinking agents are generally used in a proportion of about 0.5 to 15 parts by weight, preferably about 0.5 to 6 parts by weight, per 100 parts by weight of the fluororubber.
- a quaternary phosphonium salt or an equimolar molecular compound thereof and an active hydrogen-containing aromatic compound are used, and preferably a quaternary phosphonium salt is used.
- the quaternary phosphonium salt of the general formula (R 1 R 2 R 3 R 4 P) + X - R 1 to R 4 each represents an alkyl group having 1 to 25 carbon atoms, an alkoxyl group, an aryl group, an alkylaryl group, an aralkyl group or a polyoxyalkylene group, or two to three of them are N or P;
- tetraphenylphosphonium chloride benzyltriphenylphosphonium bromide, benzyltriphenylphosphonium chloride, trioctylbenzylphosphonium chloride, trioctylmethylphosphonium chloride, trioctylethylphosphonium acetate, tetraoctylphosphonium chloride and the like are used.
- quaternary phosphonium salts are used in a proportion of about 0.1 to 10 parts by weight, preferably about 0.5 to 5 parts by weight, per 100 parts by weight of the fluororubber.
- peroxide crosslinkable fluororubber for example, fluororubber having iodine and / or bromine in the molecule is mentioned, and these fluororubbers are generally crosslinked by an organic peroxide used for peroxide crosslinking. .
- organic peroxide for example, dicumyl peroxide, cumene hydroperoxide, p-methanehydroperoxide, 2,5-dimethylhexane-2,5-dihydroperoxide, di-tert-butyl peroxide, benzoyl peroxide M-toluyl peroxide, 2,5-dimethyl-2,5-di (tert-butylperoxy) hexane, 2,5-dimethyl-2,5-di (tert-butylperoxy) hexyne-3,1 , 3-di (tert-butylperoxyisopropyl) benzene, 2,5-dimethyl-2,5-dibenzoylperoxyhexane, (1,1,3,3-tetramethylbutylperoxy) 2-ethylhexano Alate, tert-butylperoxybenzoate, tert-butylperoxylaurate, di (tertt-
- a polyfunctional unsaturated compound be used in combination.
- Such polyfunctional unsaturated compounds include tri (meth) allyl isocyanurate, tri (meth) allyl cyanurate, triaryl trimellitate, N, N'-m-phenylenebismaleimide, diallyl phthalate, tris (diallylamine) -s-Triazine, triallyl phosphite, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, 1,3-polybutadiene and the like
- a polyfunctional unsaturated compound for improving mechanical strength, compression set and the like is used in a proportion of about 0.1 to 20 parts by weight, preferably about 0.5 to 10 parts by weight, per 100 parts by weight of peroxide-crosslinkable
- Viton E60C 100 parts by weight MT carbon black (CANCARB LIMITED product) 30 ⁇ Magnesium oxide (Kyowa Chemical Products Magnesia # 30) 10 30 Crosslinker (Dupont product Diac No. 3) 3 ⁇ (Composition example III) Fluorine rubber (Dupont product Viton E 45) 100 parts by weight Calcium metasilicate (product of NYCO Minerals) 40 ⁇ MT carbon black (product of CANCARB LIMITED) 2 ⁇ Magnesium oxide (Kyowa Chemical Products Magnesia # 150) 6 # Calcium hydroxide (Omi Chemical Industry Products) 3 Crosslinking agent (Dupont product curative # 30) 2 ⁇ Crosslinking accelerator (the company product curative # 20) 1 1 (Composition example IV) Fluorine rubber (Daikin product Daiel G 901) 100 parts by weight Calcium metasilicate (manufactured by NYCO Minerals) 20 ⁇ MT carbon black (product of CANCARB LIMITED) 20 ⁇ Magnesium oxide (
- NBR or hydrogenated NBR is used, and as a compound using a sulfur-based vulcanizing agent such as about 0.05 to 5 parts by weight of sulfur and tetramethylthiuram monosulfide per 100 parts by weight of (hydrogenated) nitrile rubber
- a sulfur-based vulcanizing agent such as about 0.05 to 5 parts by weight of sulfur and tetramethylthiuram monosulfide per 100 parts by weight of (hydrogenated) nitrile rubber
- it is preferably used as an unvulcanized nitrile rubber compound using about 0.05 to 10 parts by weight of organic peroxide as a crosslinking agent.
- organic peroxide examples include the following formulation examples.
- it is preferable to use together with the organic peroxide about 0.05 to 10 parts by weight of a polyfunctional unsaturated compound represented by triallyl isocyanurate.
- NBR medium-high nitrile; JSR product N 237) 100 parts by weight HAF carbon black 10 ⁇ 40 SRF carbon black 10 powdery cellulose Zinc oxide 10% 1 stearic acid Microcrystalline wax 2 ⁇ Anti-aging agent (Ouchi emerging chemical product ODA-NS) 4 ⁇ Plasticizer (Bayer product Bucanol OT) 5 ⁇ Organic peroxides (NOF product per hexa 25B) 6) N, Nm-phenylene dimaleimide 1 ⁇ (Formulation example VI) NBR (JSR product N235S) 100 parts by weight SRF carbon black 80 ⁇ Calcium carbonate 80 ⁇ Powdered silica 20 ⁇ Zinc oxide 5% Anti-aging agent (Ouchi emerging chemicals Noclac 224) 2 ⁇ Triallyl isocyanurate 2 ⁇ 1,3-Bis (tert-butylperoxy) isopropylbenzene 2.5% Plasticizer (Bayer product Bucanol OT) 5 ⁇
- the uncrosslinked rubber layer applied to form a single-sided crosslinked material layer having a thickness of about 5 to 120 ⁇ m was dried at a temperature of room temperature to about 100 ° C. for about 1 to 15 minutes and used as an organic solvent After volatilizing alcohols such as methanol and ethanol, ketones such as methyl ethyl ketone and methyl isobutyl ketone, and mixed solvents thereof, etc., heat crosslink at about 150 to 230 ° C. for about 0.5 to 30 minutes and press if necessary. Crosslinking is also performed.
- An amorphous carbon film is formed on the outer surface of the rubber layer formed on the metal plate via the adhesive layer by applying the plasma CVD method.
- the plasma CVD process is performed using unsaturated hydrocarbon gas, and is performed under conditions such that the film thickness of the amorphous carbon film is about 200 to 2000 nm, preferably about 400 to 1000 nm.
- a known method can be used as it is, for example, a rubber metal laminated gasket is allowed to stand on an electrode in a vacuum chamber of a low pressure plasma processing apparatus, and the vacuum chamber is evacuated After evacuating to about 5 to 50Pa, introduce unsaturated hydrocarbon gas such as acetylene gas, ethylene gas, propylene gas and so on until the degree of vacuum becomes about 6 to 100Pa.
- a high frequency power of, for example, about 300 to 3000 W is supplied from a high frequency power supply having a frequency of 40 kHz or 13.56 MHz while maintaining 6 to 100 Pa, and a high frequency voltage is applied to the other electrode for about 0.1 to 60 minutes.
- the output depends on the size of the device, the output is not limited to this range. For example, when the output is as low as about 200 W, it is impossible to improve the wear resistance under a high temperature environment.
- the amorphous carbon film formed by the above steps has a nanoindentation hardness of 10 GPa or more, preferably 15 GPa or more, and a film thickness of 200 nm or more, preferably 400 nm or more on a silicon wafer.
- An amorphous carbon film-formed rubber-metal laminate using a stainless steel plate as a plate is effectively used as an engine cylinder head gasket.
- Patent Document 2 In the general description of Patent Document 2 mentioned above, although acetylene gas is mentioned as a plasma source gas used for forming a carbon film, the gas used in each example is only methane gas, and as a substrate The use of fluororubber is merely exemplary. Also in the above-mentioned Patent Document 3, although fluororubber is exemplified as the polymer base in the general description and acetylene is exemplified as the hydrocarbon used for forming the DLC film, they are merely exemplification. .
- amorphous carbon is obtained by plasma CVD using an unsaturated hydrocarbon gas, preferably an unsaturated hydrocarbon gas having a double bond such as ethylene gas or propylene gas, on the outer surface of a fluororubber or nitrile rubber layer.
- an unsaturated hydrocarbon gas preferably an unsaturated hydrocarbon gas having a double bond such as ethylene gas or propylene gas
- a fluororubber or nitrile rubber layer By forming a film, it is possible to provide a rubber-metal laminate gasket material having reduced wear and abrasion due to friction with a seal mating surface under high temperature use conditions.
- the nanoindentation hardness on the silicon wafer is 10 GPa or more, preferably 15 GPa or more, and the film thickness is 200 nm or more, preferably 400 nm or more by plasma CVD method using unsaturated hydrocarbon gas on the outer surface of the rubber layer. It is expressed by forming an amorphous carbon film.
- an amorphous carbon film may be formed on the outer surface of the rubber layer, that is, an amorphous carbon film formed directly on the rubber surface without performing pretreatment such as termination. It is preferable to include one in which the rubber surface is previously subjected to plasma modification treatment before forming the amorphous carbon film, and one in which the interlayer film is provided between the rubber and the amorphous carbon film, but it is preferable. From the viewpoint of simplification of the structure, etc., one in which the amorphous carbon film is formed directly on the outer surface of the rubber layer without providing the interlayer film is used.
- the outer surface of the rubber layer is pretreated prior to plasma CVD treatment with unsaturated hydrocarbon gas such as acetylene gas, Ar, N 2 , H 2 , O 2 from the viewpoint of high temperature resistance.
- Plasma treatment with a non-polymerizable gas or inert gas such as 2 or a unsaturated hydrocarbon gas such as acetylene gas and the above-mentioned non-polymerizable gas or inert gas such as Ar is used at a volume ratio of 1 to 10:10 to 1 It is also possible to perform plasma processing using a mixed gas of
- Example 1 The rubber-metal laminate gasket material was manufactured by the following procedure. [Production of fluorine rubber metal laminated gasket material] After degreasing the surface of a SUS301 stainless steel plate (thickness 0.2 mm) with methyl ethyl ketone, a fluororubber compound (Formulation Example I described above) to which an adhesive component is added is applied, and crosslinking is carried out in an oven at 220 ° C for 3 minutes. Thus, a fluorine rubber metal laminated gasket material (test piece: 80 ⁇ 15 ⁇ 0.2 mm) was obtained.
- nitrile rubber metal laminated gasket material After alkaline degreasing the surface of a SUS301 steel plate (0.2 mm in thickness), a silane-based undercoating adhesive was applied to give a basis weight of 250 mg / m 2 and a baking treatment was performed at 220 ° C. for 5 minutes. Then, a phenolic resin-based top coat adhesive (Lodefer yeast product Chemlock 202) was applied, and baking was performed at 210 ° C. for 5 minutes.
- a silane-based undercoating adhesive was applied to give a basis weight of 250 mg / m 2 and a baking treatment was performed at 220 ° C. for 5 minutes.
- a phenolic resin-based top coat adhesive Lidefer yeast product Chemlock 202
- solution of a nitrile rubber compound (Formulation Example V) is coated on the top-coated adhesive layer on the SUS301 stainless steel plate, 60.degree.
- pressure crosslinking is carried out for 10 minutes at 180 ° C, 60 kgf / m 2 (5.88 MPa), nitrile rubber metal laminate gasket material (test piece : 80 x 15 x 0.2 mm) was obtained.
- the rubber-metal laminate gasket was allowed to stand on the lower electrode in the vacuum tank of the low pressure plasma processing apparatus so that the rubber surface faced upward, and the inside of the vacuum tank was evacuated to a vacuum degree of 8 Pa.
- Acetylene gas is introduced until the degree of vacuum reaches 10 Pa, and while maintaining the pressure in the vacuum chamber at about 10 Pa, apply a high frequency voltage of 900 W from the high frequency (40 kHz) power source to the lower electrode for 10 minutes.
- the gas was plasmatized to form an amorphous carbon film on the rubber-metal laminate.
- upper and lower electrodes are disposed on the upper and lower sides inside a vacuum tank provided with a gas supply unit and a gas exhaust device on the outer side, and the lower electrode is outside the vacuum tank. Used in connection with the high frequency power source disposed in the above, and provided with a ground wire from the upper electrode to the outside of the vacuum chamber. Further, as a test piece for evaluation, a low-pressure plasma-treated silicon wafer test piece having a similar amorphous carbon film formed on the surface was also formed in the same manner in the chamber.
- the heat resistance was evaluated using a rubber-metal laminate gasket material (test piece) having an amorphous carbon film formed on the surface. Furthermore, the film thickness and film hardness of the amorphous carbon film were evaluated using the silicon wafer test piece in which the amorphous carbon film was formed on the surface. Heat resistance evaluation: After exposing the rubber metal laminate gasket to air at 200 ° C.
- the cylinder head gasket for an engine can be used if it is 80 times or more, preferably 200 times or more, more preferably 300 times or more.
- the polarization condition of silicon wafer test pieces is measured under the condition of an incident angle of 70 degrees, wavelength range of 2066 to 248 nm, and a spot diameter of 1 mm ⁇ 3 mm, and amorphous carbon film coating on silicon wafer Thickness was calculated. Note that when linearly polarized light is incident, spectral ellipsometry changes the polarization state according to the film thickness (d) of the sample and the optical constants (refractive index n and extinction coefficient k), and the phase is shifted by an ellipse.
- the film hardness is preferably 400 nm or more.
- Film hardness Using a nanoindenter (G200) manufactured by Azilendo Technologies, for silicon wafer test pieces, CSM measurement to a depth of 200 nm to a depth of 200 nm with a strain of 0.05 / sec. The coating hardness of an amorphous carbon film on a silicon wafer at 50 nm depth was calculated by pressing. A cylinder head gasket for an engine of 10 GPa or more, preferably 15 GPa or more is desired. The hardness of the amorphous carbon film formed on the rubber is difficult to measure correctly because the rubber is an elastic body, but measuring the hardness of the amorphous carbon film formed on the silicon wafer This makes it possible to accurately grasp the hardness of the film itself.
- Example 2 In Example 1, low pressure plasma treatment was performed using ethylene gas instead of acetylene gas and changing the degree of vacuum to 20 Pa.
- Example 3 In Example 1, low pressure plasma treatment was performed using propylene gas instead of acetylene gas and changing the degree of vacuum to 20 Pa.
- Comparative example 2 In Example 2, low-pressure plasma treatment with high frequency power was performed with the output changed to 200 W.
- Comparative example 4 In Example 1, low pressure plasma treatment was performed using methane gas instead of acetylene gas and changing the degree of vacuum to 20 Pa.
- Comparative example 5 In Comparative Example 4, low-pressure plasma treatment with high frequency power was performed with the output changed to 200 W.
Abstract
Description
(R1R2R3R4P)+X-
R1~R4:炭素数1~25のアルキル基、アルコキシル基、アリー
ル基、アルキルアリール基、アラルキル基またはポリオキシ
アルキレン基であり、あるいはこれらの内2~3個がNまたはP
と共に複素環構造を形成することもできる
X-:Cl-、Br-、I-、HSO4 -、H2PO4 -、RCOO-、ROSO2 -、CO3 - -等
のアニオン
で表わされる化合物、具体的にはテトラフェニルホスホニウムクロライド、ベンジルトリフェニルホスホニウムブロマイド、ベンジルトリフェニルホスホニウムクロライド、トリオクチルベンジルホスホニウムクロライド、トリオクチルメチルホスホニウムクロライド、トリオクチルエチルホスホニウムアセテート、テトラオクチルホスホニウムクロライドなどが用いられる。
フッ素ゴム(デュポン社製品バイトンA-200) 100重量部
MTカーボンブラック(N990) 20 〃
ホワイトカーボン(東ソーシリカ社製品ニップシールER) 10 〃
酸化マグネシウム(協和化学製品マグネシア#30) 5 〃
土状黒鉛(日電カーボン製品A-O) 30 〃
加硫剤(デュポン社製品キュラティブ#30) 10.7 〃
加硫促進剤(デュポン社製品キュラティブ#20) 5.8 〃
エポキシ基含有シランカップリング剤 4.6 〃
(東レダウコーニング製品SH-6040)
エポキシ変性フェノール樹脂 34.5 〃
(大日本インキ化学製品エピクロンN695)
(配合例II)
フッ素ゴム(デュポン社製品バイトンE60C) 100重量部
MTカーボンブラック(CANCARB LIMITED社製品) 30 〃
酸化マグネシウム(協和化学製品マグネシア#30) 10 〃
架橋剤(デュポン社製品ダイアックNo.3) 3 〃
(配合例III)
フッ素ゴム(デュポン社製品バイトンE45) 100重量部
メタけい酸カルシウム(NYCO Minerals社製品) 40 〃
MTカーボンブラック(CANCARB LIMITED社製品) 2 〃
酸化マグネシウム(協和化学製品マグネシア#150) 6 〃
水酸化カルシウム(近江化学工業製品) 3 〃
架橋剤(デュポン社製品キュラティブ#30) 2 〃
架橋促進剤(同社製品キュラティブ#20) 1 〃
(配合例IV)
フッ素ゴム(ダイキン製品ダイエルG901) 100重量部
メタけい酸カルシウム(NYCO Minerals社製品) 20 〃
MTカーボンブラック(CANCARB LIMITED社製品) 20 〃
酸化マグネシウム(マグネシア#150) 6 〃
水酸化カルシウム(近江化学工業製品) 3 〃
トリアリルイソシアヌレート(日本化成製品) 1.8 〃
有機過酸化物(日本油脂製品パーヘキサ25B) 0.8 〃
NBR(中高ニトリル;JSR製品N237) 100重量部
HAFカーボンブラック 10 〃
SRFカーボンブラック 40 〃
粉末状セルロース 10 〃
酸化亜鉛 10 〃
ステアリン酸 1 〃
マイクロクリスタリンワックス 2 〃
老化防止剤(大内新興化学製品ODA-NS) 4 〃
可塑剤(バイエル社製品ブカノールOT) 5 〃
有機過酸化物(日本油脂製品パーヘキサ25B) 6 〃
N,N-m-フェニレンジマレイミド 1 〃
(配合例VI)
NBR(JSR製品N235S) 100重量部
SRFカーボンブラック 80 〃
炭酸カルシウム 80 〃
粉末状シリカ 20 〃
酸化亜鉛 5 〃
老化防止剤(大内新興化学製品ノクラック224) 2 〃
トリアリルイソシアヌレート 2 〃
1,3-ビス(第3ブチルパーオキシ)イソプロピルベンゼン 2.5 〃
可塑剤(バイエル社製品ブカノールOT) 5 〃
次の手順によって、ゴム金属積層ガスケット素材の作製が行われた。
〔フッ素ゴム金属積層ガスケット素材の作製〕
SUS301ステンレス鋼板(厚さ0.2mm)の表面をメチルエチルケトンで脱脂した後、接着剤成分を添加したフッ素ゴムコンパウンド(前記配合例I)を塗布し、オーブン中にて220℃、3分間の架橋を行って、フッ素ゴム金属積層ガスケット素材(テストピース:80×15×0.2mm)を得た。
〔ニトリルゴム金属積層ガスケット素材の作製〕
SUS301鋼板(厚さ0.2mm)の表面をアルカリ脱脂した後、シラン系下塗り接着剤を目付量250mg/m2となるように塗布し、220℃で5分間の焼付処理を行った。次いで、フェノール樹脂系上塗り接着剤(ロードファーイースト製品ケムロック202)を塗布し、210℃、5分間の焼付処理を行った。その後、SUS301ステンレス鋼板上の上塗り接着剤層上に、ニトリルゴムコンパウンド(前記配合例V)の25重量%混合有機溶剤(トルエン:メチルエチルケトン=重量比9:1)溶液を塗布し、60℃、15分間乾燥させて片面厚さ20μmの未架橋ゴム層を形成させた後、180℃、60kgf/m2(5.88MPa)、10分間の加圧架橋を行って、ニトリルゴム金属積層ガスケット素材(テストピース:80×15×0.2mm)を得た。
耐熱性評価:ゴム金属積層ガスケット素材を200℃、72時間の空気加熱暴露後、レスカ社製フリクションプレイヤー(FPR-2000)を用い、5mm径のSUJ2製ピン、荷重500g(フッ素ゴムの場合)または荷重5000g(ニトリルゴムの場合)、回転半径40mm、回転速度15rpmの条件下で、角度35.8°の間を往復させ、コートしてあるゴムが剥がれ、金属が露出するまでの往復動回数を測定した
エンジン用シリンダーヘッドガスケットとしては、80回以上であれば使用可能であるが、好ましくは200回以上、より好ましくは300回以上のものが望まれる
膜厚:堀場製作所社製分光エリプソメーター(UVISEL)を用い、シリコンウェハテスト片について、入射角度70度、波長範囲2066~248nm、スポット径1mm×3mmの楕円の条件下で偏光状況を測定し、シリコンウェハ上の非晶質炭素膜コーティング厚みを算出した
なお、分光エリプソは、直線偏光を入射したとき、サンプルの膜厚(d)や光学定数(屈折率n、消衰係数k)によって偏光状態が変わり、位相が任意にずれた楕円偏光になるが、この偏光状態の変化量を測定し、サンプル膜厚(d)や光学定数(屈折率n、消衰係数k)を求める分析手法である
エンジン用シリンダーヘッドガスケットとしては、200nm以上、好ましくは400nm以上のものが望まれる
膜硬度:アジレンドテクノロジー社製ナノインデンター(G200)を用い、シリコンウェハテスト片について、CSM測定で200nmの深さまで2nmの振幅、0.05/秒の歪で押し込み、深さ50nmでのシリコンウェハ上の非晶質炭素膜のコーティング硬さを算出した
エンジン用シリンダーヘッドガスケットとしては、10GPa以上、好ましくは15GPa以上のものが望まれる
なお、ゴム上に形成された非晶質炭素膜の硬度は、ゴムが弾性体であることで正しく測定することが難しいが、シリコンウェハ上に形成された非晶質炭素膜の硬さを測定することにより、膜自体の硬度を正確に把握することが可能となる。
実施例1において、低圧プラズマ処理が、アセチレンガスの代わりにエチレンガスを用い、また真空度を20Paにそれぞれ変更して行われた。
実施例1において、低圧プラズマ処理が、アセチレンガスの代わりにプロピレンガスを用い、また真空度を20Paにそれぞれ変更して行われた。
実施例1において、高周波電力による低圧プラズマ処理が出力を200Wに変更して行われた。
実施例2において、高周波電力による低圧プラズマ処理が出力を200Wに変更して行われた。
実施例3において、高周波電力による低圧プラズマ処理が出力を200Wに変更して行われた。
実施例1において、低圧プラズマ処理が、アセチレンガスの代わりにメタンガスを用い、また真空度を20Paにそれぞれ変更して行われた。
比較例4において、高周波電力による低圧プラズマ処理が出力を200Wに変更して行われた。
実施例1において、高周波電力による低圧プラズマ処理が行われなかった。
Claims (7)
- フッ素ゴムまたはニトリルゴムを金属板に積層せしめたゴム-金属積層ガスケット素材のゴム層外表面に、不飽和炭化水素ガスを用いて高周波電源から高周波電力を供給するプラズマCVD法によって、シリコンウェハ上でのナノインデンテーション硬さが10GPa以上で、かつ膜厚200nm以上である非晶質炭素膜を形成させたゴム-金属積層ガスケット素材。
- 不飽和炭化水素ガスが、アセチレンガス、エチレンガスまたはプロピレンガスである請求項1記載のゴム-金属積層ガスケット素材。
- ゴム層と金属板との間に接着剤層を有する請求項1または2記載のゴム-金属積層ガスケット素材。
- ゴム層が接着剤成分を含有している請求項1または2記載のフッ素ゴム-金属積層ガスケット素材。
- プラズマCVD法の適用に際し、出力300W以上の高周波電力が用いられた請求項1または2記載のフッ素ゴム-金属積層ガスケット素材。
- エンジンのシリンダーヘッドガスケットとして用いられる請求項1または2記載のゴム-金属積層ガスケット素材。
- 請求項6記載のゴム-金属積層ガスケット素材よりなるエンジンのシリンダーヘッドガスケット。
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WO2019103113A1 (ja) * | 2017-11-24 | 2019-05-31 | Nok株式会社 | ガスケット素材 |
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JP3637912B2 (ja) | 2003-12-09 | 2005-04-13 | 日新電機株式会社 | 自動車用シール材の製造方法 |
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WO2009016922A1 (ja) | 2007-08-01 | 2009-02-05 | Nok Corporation | ニトリルゴム金属積層体の製造方法 |
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JPH01252686A (ja) * | 1987-12-14 | 1989-10-09 | Nichias Corp | ゴムコートガスケット用素材 |
JPH0229484A (ja) * | 1988-07-19 | 1990-01-31 | Nichias Corp | ゴムコートガスケット用素材 |
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CN111373178A (zh) * | 2017-11-24 | 2020-07-03 | Nok株式会社 | 垫片材料 |
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CN106536669B (zh) | 2018-08-14 |
CN106536669A (zh) | 2017-03-22 |
US20170037811A1 (en) | 2017-02-09 |
JPWO2015159818A1 (ja) | 2017-04-13 |
JP6281636B2 (ja) | 2018-02-21 |
US10094330B2 (en) | 2018-10-09 |
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