WO2018079566A1 - 架橋性ゴム組成物、ゴム架橋物および複合体 - Google Patents
架橋性ゴム組成物、ゴム架橋物および複合体 Download PDFInfo
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- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
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- 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
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- C08F222/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
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- C08F236/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
- C08F236/02—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds
- C08F236/04—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated
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- C08F236/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
- C08F236/02—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds
- C08F236/04—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated
- C08F236/12—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated with nitriles
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- C08F236/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
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- C08F236/04—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated
- C08F236/14—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated containing elements other than carbon and hydrogen
- C08F236/16—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated containing elements other than carbon and hydrogen containing halogen
- C08F236/18—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated containing elements other than carbon and hydrogen containing halogen containing chlorine
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- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
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- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
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- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
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- C08K5/17—Amines; Quaternary ammonium compounds
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L13/00—Compositions of rubbers containing carboxyl groups
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- C08L15/00—Compositions of rubber derivatives
- C08L15/005—Hydrogenated nitrile rubber
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- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L9/02—Copolymers with acrylonitrile
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- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
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- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
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- C08K2003/262—Alkali metal carbonates
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- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
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- C08K2003/267—Magnesium carbonate
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- C08L2312/00—Crosslinking
Definitions
- the present invention relates to a crosslinkable rubber composition, a rubber cross-linked product, and a composite using the rubber cross-linked product.
- carboxyl group-containing highly saturated nitrile copolymer rubbers such as hydrogenated acrylonitrile-butadiene copolymer rubbers having carboxyl groups are known.
- the carboxyl group-containing highly saturated nitrile copolymer rubber has fewer carbon-carbon unsaturated bonds in the main chain than nitrile copolymer rubbers such as acrylonitrile-butadiene copolymer rubber. Therefore, the obtained rubber cross-linked product is excellent in heat resistance, oil resistance, ozone resistance and the like, and is used in various fuel oil hoses, O-rings, belts in oil, and the like for automobiles.
- Patent Document 1 discloses a crosslinkable rubber composition in which a polyamine-based crosslinking agent is blended with a nitrile group-containing highly saturated copolymer rubber having an iodination of 20 to 75.
- the rubber cross-linked product obtained from this cross-linkable rubber composition is excellent in compression set resistance and adhesion to metal (hereinafter referred to as metal adhesion).
- the metal adhesiveness of the rubber cross-linked product is required to be maintained even in an environment where it is immersed in LLC (Long-life Coolant, cooling water) for uses such as automobile radiators.
- LLC Long-life Coolant, cooling water
- the carboxyl group-containing highly saturated nitrile copolymer rubber disclosed in Patent Document 1 above does not necessarily have sufficient metal adhesion of the rubber cross-linked product in a use environment immersed in LLC.
- An object of the present invention is to provide a crosslinkable rubber composition that is excellent in compression set resistance and that provides a rubber cross-linked product that maintains excellent metal adhesion even after immersion in LLC.
- a carboxyl group-containing nitrile rubber (A) containing a halogen or a halogen compound and having an iodine value of 120 or less, a polyamine-based crosslinking agent (B), A crosslinkable rubber composition having a metal acid acceptor (C) is provided.
- a crosslinkable rubber composition that is excellent in compression set resistance and that provides a rubber cross-linked product that maintains excellent metal adhesion even after immersion in LLC.
- the crosslinkable rubber composition according to an embodiment of the present invention includes a carboxyl group-containing nitrile rubber (A) containing a halogen or a halogen compound and having an iodine value of 120 or less, a polyamine-based crosslinking agent (B), a metal-based receiver.
- the nitrile rubber having an iodine value of 120 or less is a nitrile copolymer rubber having a relatively high hydrogenation rate (hereinafter, sometimes referred to as highly saturated nitrile rubber or carboxyl group-containing highly saturated nitrile rubber). .
- the carboxyl group-containing nitrile rubber (A) used in the present embodiment is not particularly limited as long as it contains a halogen or a halogen compound and has an iodine value of 120 or less.
- Examples of such carboxyl group-containing nitrile rubbers include ⁇ , ⁇ -ethylenically unsaturated nitrile monomer units (a1), ⁇ , ⁇ -ethylenically unsaturated dicarboxylic acid monoester monomer units (a2), And a conjugated diene monomer unit (a3), and at least a part of the conjugated diene monomer unit (a3) is hydrogenated.
- the ⁇ , ⁇ -ethylenically unsaturated nitrile monomer is not particularly limited as long as it is an ⁇ , ⁇ -ethylenically unsaturated compound having a nitrile group, and acrylonitrile; ⁇ -chloroacrylonitrile, ⁇ -bromoacrylonitrile, etc. -Halogenoacrylonitrile; ⁇ -alkylacrylonitriles such as methacrylonitrile and ethacrylonitrile; Among these, acrylonitrile and methacrylonitrile are preferable, and acrylonitrile is more preferable.
- the ⁇ , ⁇ -ethylenically unsaturated nitrile monomer may be used alone or in combination of two or more.
- the content of the ⁇ , ⁇ -ethylenically unsaturated nitrile monomer unit (a1) in the carboxyl group-containing nitrile rubber (A) is 5 to 60% by weight, preferably 10%, based on the total monomer units. -55 wt%, more preferably 12-50 wt%. In the present specification, “wt%” is synonymous with “mass%”. If the content of the ⁇ , ⁇ -ethylenically unsaturated nitrile monomer unit is too small, the oil resistance of the resulting rubber cross-linked product may be lowered. On the other hand, when there is too much content, the cold resistance of the rubber crosslinked material obtained may fall.
- Examples of the monomer that forms the ⁇ , ⁇ -ethylenically unsaturated dicarboxylic acid monoester monomer unit (a2) include ⁇ , ⁇ - having one unsubstituted (free) carboxyl group that is not esterified. It will not specifically limit if it is a monoester monomer of ethylenically unsaturated dicarboxylic acid. Unsubstituted carboxyl groups are mainly used for crosslinking.
- the organic group bonded to the carbonyl group through an oxygen atom constituting a part of the ester bond in the ⁇ , ⁇ -ethylenically unsaturated dicarboxylic acid monoester monomer includes an alkyl group, a cycloalkyl group and an alkylcycloalkyl group.
- Group is preferred, and an alkyl group is particularly preferred.
- the organic group bonded to the carbonyl group is an alkyl group, it preferably has 1 to 12 carbon atoms, more preferably 2 to 6 carbon atoms. In the case of a cycloalkyl group, those having 5 to 12 carbon atoms are preferred, and more preferably those having 6 to 10 carbon atoms.
- an alkylcycloalkyl group those having 6 to 12 carbon atoms are preferred, and more preferably those having 7 to 10 carbon atoms. If the number of carbon atoms of the organic group bonded to the carbonyl group is too small, the processing stability of the crosslinkable rubber composition may be reduced. On the other hand, if the number of carbon atoms is too large, the crosslinking rate may be slow, and the mechanical properties of the resulting rubber cross-linked product may be reduced.
- the ⁇ , ⁇ -ethylenically unsaturated dicarboxylic acid monoester monomer unit (a2) forming the ⁇ , ⁇ -ethylenically unsaturated dicarboxylic acid monoester monomer unit includes monomethyl maleate, monoethyl maleate, maleic acid Maleic monoalkyl esters such as monopropyl and mono-n-butyl maleate; monocyclic maleates such as monocyclopentyl maleate, monocyclohexyl maleate and monocycloheptyl maleate; monomethylcyclopentyl maleate and monoethyl maleate Monoalkyl cycloalkyl maleates such as cyclohexyl; monoalkyl fumarate such as monomethyl fumarate, monoethyl fumarate, monopropyl fumarate, mono-n-butyl fumarate; monocyclopentyl fumarate; Monocycloalkyl esters of fumaric acid such as monocyclohexyl
- ⁇ , ⁇ -ethylenic unsaturation such as monopropyl maleate, mono n-butyl maleate, monopropyl fumarate, mono n-butyl fumarate, monopropyl citraconic acid, mono n-butyl citraconic acid;
- a monoester of a dicarboxylic acid having a carboxyl group at each of the two carbon atoms forming the bond is preferred, and the two carboxyl groups such as mono-n-butyl maleate and monopropyl citraconic acid are in the cis position (cis configuration). More preferred are monoesters of dicarboxylic acids, and particularly preferred is mono-n-butyl maleate.
- the ⁇ , ⁇ -ethylenically unsaturated dicarboxylic acid monoester monomer may be used alone or in combination of two or more.
- the content of the ⁇ , ⁇ -ethylenically unsaturated dicarboxylic acid monoester monomer unit (a2) in the carboxyl group-containing nitrile rubber (A) is 0.5 to 12% by weight in the total monomer units. Yes, preferably 1 to 10% by weight, more preferably 2 to 8% by weight. If the content of the ⁇ , ⁇ -ethylenically unsaturated dicarboxylic acid monoester monomer unit (a2) is too small, the mechanical properties and compression set resistance of the resulting rubber cross-linked product may be deteriorated. On the other hand, if the content is too high, the scorch stability of the crosslinkable rubber composition may be deteriorated, or the fatigue resistance of the resulting rubber cross-linked product may be reduced.
- conjugated diene monomer forming the conjugated diene monomer unit (a3) examples include 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, chloroprene and the like. It is done. Of these, 1,3-butadiene is preferred.
- the content of the conjugated diene monomer unit (a3) in the carboxyl group-containing nitrile rubber (A) is from 20 to 90% by weight, preferably from 20 to 80% by weight, more preferably from all monomer units. Is 30 to 65% by weight.
- the content of the conjugated diene monomer unit (a3) in the carboxyl group-containing nitrile rubber (A) is from 20 to 90% by weight, preferably from 20 to 80% by weight, more preferably from all monomer units. Is 30 to 65% by weight.
- the rubber elasticity of the rubber crosslinked material obtained will fall.
- the chemical stability of the rubber crosslinked material obtained may be impaired.
- the carboxyl group-containing nitrile rubber (A) used in the present embodiment includes the ⁇ , ⁇ -ethylenically unsaturated nitrile monomer unit (a1), the ⁇ , ⁇ -ethylenically unsaturated dicarboxylic acid monoester monomer.
- the unit (a2) and the conjugated diene monomer unit (a3) it may further contain a (meth) acrylic acid alkyl ester monomer unit (a4).
- “(meth) acrylic acid” means at least one selected from “acrylic acid” and “methacrylic acid”.
- the (meth) acrylic acid alkyl ester monomer forming the (meth) acrylic acid alkyl ester monomer unit (a4) includes methyl (meth) acrylate, ethyl (meth) acrylate, and propyl (meth) acrylate.
- the content of the (meth) acrylic acid alkyl ester monomer unit (a4) in the carboxyl group-containing nitrile rubber (A) is 12 to 50% by weight, preferably 15 to 45%, based on the total monomer units. % By weight, more preferably 18 to 40% by weight.
- the carboxyl group-containing nitrile rubber (A) used in the present embodiment is a unit of other monomers that can be copolymerized with the monomers forming these monomer units in addition to the above monomer units. May be contained.
- monomers that form other copolymerizable monomer units include ⁇ , ⁇ -ethylenically unsaturated carboxylic acid ester monomers (the ⁇ , ⁇ -ethylenically unsaturated dicarboxylic acid monoesters described above) Monomers and (meth) acrylic acid alkyl ester monomers), ⁇ , ⁇ -ethylenically unsaturated monocarboxylic acid monomers, ⁇ , ⁇ -ethylenically unsaturated polycarboxylic acid monomers, Examples include ⁇ , ⁇ -ethylenically unsaturated polyvalent carboxylic acid anhydride monomers, aromatic vinyl monomers, fluorine-containing vinyl monomers, and copolymerizable nitrogen-containing monomers.
- Examples of ⁇ , ⁇ -ethylenically unsaturated carboxylic acid ester monomers include amino group-containing (meth) acrylic acid alkyl esters such as 2-aminoethyl (meth) acrylate and aminomethyl (meth) acrylate.
- (Meth) acrylic acid hydroxyalkyl ester monomers such as 2-hydroxyethyl (meth) acrylate and 3-hydroxypropyl (meth) acrylate, wherein the alkyl group has 1 to 16 carbon atoms; Fluoroalkyl group-containing (meth) acrylic acid alkyl ester monomers such as trifluoroethyl acrylate and difluoromethyl (meth) acrylate; Dialkyl maleates such as dimethyl maleate and di-n-butyl maleate; Dialkyl esters of fumaric acid such as dimethyl acid and di-n-butyl fumarate; Maleic acid dicycloalkyl esters such as cyclopentyl and dicyclohexyl maleate; dicyclopentyl fumarate, dicycloalkyl esters such as dicyclohexyl fumarate; itaconic acid dialkyl esters such as dimethyl itaconate and di-n-butyl itaconate: ita
- Examples of the ⁇ , ⁇ -ethylenically unsaturated monocarboxylic acid monomer include acrylic acid, methacrylic acid, ethyl acrylic acid, crotonic acid, and cinnamic acid.
- Examples of the ⁇ , ⁇ -ethylenically unsaturated polyvalent carboxylic acid monomer include itaconic acid, fumaric acid, maleic acid and the like.
- Examples of the ⁇ , ⁇ -ethylenically unsaturated polyvalent carboxylic acid anhydride monomer include maleic anhydride, itaconic anhydride, citraconic anhydride and the like.
- aromatic vinyl monomer examples include styrene, ⁇ -methylstyrene, vinyl pyridine and the like.
- Fluorine-containing vinyl monomers include fluoroethyl vinyl ether, fluoropropyl vinyl ether, ortho-trifluoromethyl styrene, vinyl pentafluorobenzoate, difluoroethylene, tetrafluoroethylene and the like.
- copolymerizable nitrogen-containing monomers examples include N- (4-anilinophenyl) acrylamide, N- (4-anilinophenyl) methacrylamide, N- (4-anilinophenyl) cinnamamide, N- (4- Examples of the anti-aging agent include anilinophenyl) crotonamide, N-phenyl-4- (3-vinylbenzyloxy) aniline, and N-phenyl-4- (4-vinylbenzyloxy) aniline.
- the content of the other monomer units is preferably 50% by weight or less, more preferably 30% by weight or less, and still more preferably with respect to all monomer units constituting the carboxyl group-containing nitrile rubber (A). 10% by weight or less.
- the iodine value of the carboxyl group-containing nitrile rubber (A) used in the present embodiment is 120 or less, preferably 60 or less, more preferably 40 or less, and particularly preferably 20 or less.
- the carboxyl group-containing nitrile rubber the above-mentioned monomer is contained in the above-mentioned predetermined amount, and the iodine value is in a predetermined range as described above.
- the agent (B) By combining with the agent (B), a rubber cross-linked product having excellent compression set resistance and metal adhesion can be obtained. If the iodine value is too low, the cold resistance of the resulting rubber cross-linked product may be lowered. On the other hand, if the iodine value is too high, the heat resistance of the resulting rubber cross-linked product may be lowered.
- the method for bringing the iodine value of the carboxyl group-containing nitrile rubber (A) used in this embodiment into the above range is, for example, a hydrogenation catalyst in the hydrogenation reaction when producing the carboxyl group-containing nitrile rubber (A).
- a hydrogenation catalyst in the hydrogenation reaction when producing the carboxyl group-containing nitrile rubber (A).
- the polymer Mooney viscosity (ML1 + 4, 100 ° C.) of the carboxyl group-containing nitrile rubber (A) used in the present embodiment is preferably 10 to 200, more preferably 15 to 150, still more preferably 15 to 100, and particularly preferably. Is 20-70.
- the carboxyl group-containing nitrile rubber (A) used in the present embodiment contains a halogen or a halogen compound.
- a halogen or halogen compound is produced by, for example, mixing or remaining a halogen derived from a coagulant (for example, chlorine) in the carboxyl group-containing nitrile rubber when the carboxyl group-containing nitrile rubber latex described below is coagulated. It is possible that this will occur.
- solid matter (crumb) is washed when filtering the carboxyl group-containing nitrile rubber after coagulation, but it is difficult to completely remove such halogen or halogen compound.
- halogen or halogen compound examples include halogens such as fluorine, chlorine and bromine, and halogen compounds thereof.
- the amount of halogen or halogen compound contained in the carboxyl group-containing nitrile rubber (A) is not particularly limited, but is usually 100 to 9000 ppm, preferably 8000 ppm as a halogen alone with respect to the carboxyl group-containing nitrile rubber (A). Below, more preferably 6000 ppm or less. Note that if the amount of halogen or halogen compound contained in the carboxyl group-containing nitrile rubber (A) is too large, the metal adhesion may be lowered.
- the method for producing the carboxyl group-containing nitrile rubber (A) used in the present embodiment is not particularly limited, but a latex of nitrile rubber is prepared by copolymerizing the above monomers by emulsion polymerization using an emulsifier. It is preferable to produce by hydrogenation.
- emulsion polymerization commonly used polymerization auxiliary materials such as emulsifiers, polymerization initiators, molecular weight regulators and the like can be used.
- Nonionic emulsifiers such as polyoxyethylene alkyl ether, polyoxyethylene alkyl phenol ether, polyoxyethylene alkyl ester, polyoxyethylene sorbitan alkyl ester; Myristic acid, palmitic acid, oleic acid And anionic emulsifiers such as salts of fatty acids such as linolenic acid, alkylbenzene sulfonates such as sodium dodecylbenzene sulfonate, higher alcohol sulfates, and alkyl sulfosuccinates; sulfoesters of ⁇ , ⁇ -unsaturated carboxylic acids, ⁇ , ⁇ -unsaturated carboxylic acid sulfate esters, sulfoalkyl aryl ethers and other copolymerizable emulsifiers;
- the amount of the emulsifier used is preferably 0.1
- the polymerization initiator is not particularly limited as long as it is a radical initiator, but inorganic peroxides such as potassium persulfate, sodium persulfate, ammonium persulfate, potassium perphosphate, hydrogen peroxide; t-butyl peroxide, cumene Hydroperoxide, p-menthane hydroperoxide, di-t-butyl peroxide, t-butylcumyl peroxide, acetyl peroxide, isobutyryl peroxide, octanoyl peroxide, dibenzoyl peroxide, 3, 5, 5 Organic peroxides such as trimethylhexanoyl peroxide and t-butylperoxyisobutyrate; azobisisobutyronitrile, azobis-2,4-dimethylvaleronitrile, azobiscyclohexanecarbonitrile, methyl azobisisobutyrate, etc.
- inorganic peroxides
- polymerization initiators can be used alone or in combination of two or more.
- an inorganic or organic peroxide is preferable.
- a peroxide is used as the polymerization initiator, it can be used as a redox polymerization initiator in combination with a reducing agent such as sodium bisulfite or ferrous sulfate.
- the amount of the polymerization initiator used is preferably 0.01 to 2 parts by weight with respect to 100 parts by weight of all monomers.
- the molecular weight modifier is not particularly limited, but mercaptans such as t-dodecyl mercaptan, n-dodecyl mercaptan, octyl mercaptan; halogenated hydrocarbons such as carbon tetrachloride, methylene chloride, methylene bromide; ⁇ -methylstyrene dimer And sulfur-containing compounds such as tetraethylthiuram disulfide, dipentamethylene thiuram disulfide, and diisopropylxanthogen disulfide. These can be used alone or in combination of two or more.
- the amount of the molecular weight modifier used is preferably 0.1 to 0.8 parts by weight with respect to 100 parts by weight of the total monomers.
- Water is usually used as the emulsion polymerization medium.
- the amount of water is preferably 80 to 500 parts by weight with respect to 100 parts by weight of the total monomers.
- polymerization auxiliary materials such as a stabilizer, a dispersant, a pH adjuster, an oxygen scavenger, and a particle size adjuster can be used as necessary. In using these, neither the kind nor the usage-amount is specifically limited.
- the nitrile rubber in the resulting nitrile rubber latex is subjected to a hydrogenation reaction in which the double bond of the conjugated diene monomer unit (a3) is selectively hydrogenated, whereby a carboxyl group-containing nitrile rubber is obtained.
- (A) can be manufactured.
- the hydrogenation may be performed by a known method, such as an oil layer hydrogenation method in which a latex of nitrile rubber obtained by emulsion polymerization is coagulated and then hydrogenated in an oil layer, or an aqueous layer in which latex obtained by polymerization is hydrogenated as it is.
- a known method such as an oil layer hydrogenation method in which a latex of nitrile rubber obtained by emulsion polymerization is coagulated and then hydrogenated in an oil layer, or an aqueous layer in which latex obtained by polymerization is hydrogenated as it is.
- hydrogenation method etc. are mentioned, Among these, the water layer hydrogenation method is preferable.
- the aqueous layer hydrogenation method includes an aqueous layer direct hydrogenation method in which hydrogen is supplied by supplying hydrogen to the reaction system in the presence of a hydrogenation catalyst, and hydrogenation by reducing in the presence of an oxidizing agent, a reducing agent and an activator.
- a water layer indirect hydrogenation method to be added, the water layer direct hydrogenation method is more preferable.
- the hydrogenation catalyst used in the water layer direct hydrogenation method is not particularly limited as long as it is a compound that is difficult to decompose with water, and examples thereof include a palladium catalyst.
- the palladium catalyst include palladium salts of carboxylic acids such as formic acid, acetic acid, propionic acid, lauric acid, succinic acid, oleic acid and phthalic acid; palladium chloride, dichloro (cyclooctadiene) palladium, dichloro (norbornadiene) palladium. And palladium chlorinated compounds such as ammonium hexachloropalladium (IV); palladium iodinated compounds such as palladium iodide; palladium sulfate dihydrate and the like. Of these, palladium salts of carboxylic acids, dichloro (norbornadiene) palladium and ammonium hexachloropalladium (IV) are particularly preferred.
- carboxylic acids such as formic acid, acetic acid, propionic acid, lauric acid, succinic acid, oleic acid and phthalic acid
- palladium chloride dichloro (cycloo
- the amount of the hydrogenation catalyst used may be appropriately determined according to the type of the hydrogenation catalyst used and the target iodine value, but the content of the palladium catalyst relative to the nitrile rubber before hydrogenation is preferably 200 to 3000 ppm by weight, more preferably 300 to 2500 ppm by weight.
- the reaction temperature, hydrogen pressure and reaction time in the water layer direct hydrogenation method may be appropriately determined according to the target iodine value, but the reaction temperature is preferably 30 to 70 ° C., more preferably 40 to 70. ° C, particularly preferably 40 to 60 ° C.
- the hydrogen pressure is preferably 1 to 5 MPa, more preferably 2 to 4 MPa.
- the reaction time is preferably 4 to 8 hours, particularly preferably 5 to 8 hours.
- carboxyl group-containing nitrile rubber (A) can be obtained by subjecting the latex after the hydrogenation reaction thus obtained to coagulation by salting out, filtration and drying.
- the filtration and drying steps subsequent to coagulation can be performed by known methods.
- the crosslinkable rubber composition used in the present embodiment contains a polyamine-based crosslinking agent (B) in addition to the above-described carboxyl group-containing nitrile rubber (A).
- a polyamine-based crosslinking agent (B) in addition to the above-described carboxyl group-containing nitrile rubber (A).
- the polyamine-based crosslinking agent (B) is not particularly limited as long as it is a compound having two or more amino groups or a compound having two or more amino groups at the time of crosslinking.
- polyamine crosslinking agent (B) examples include fats such as hexamethylene diamine, hexamethylene diamine carbamate, N, N-dicinnamylidene-1,6-hexane diamine, tetramethylene pentamine, and hexamethylene diamine cinnamaldehyde adduct.
- Aromatic polyamines such as diamine and 1,3,5-benzenetriamine; isophthalic acid dihydrazide, terephthalic acid dihydrazide, phthalic acid dihydrazide, 2,6-naphthalenedicarboxylic acid dihydrazide, naphthalene acid dihydrazide, ox
- the blending amount of the polyamine-based crosslinking agent (B) in the crosslinkable rubber composition of the present embodiment is preferably 0.1 to 20 parts by weight with respect to 100 parts by weight of the carboxyl group-containing nitrile rubber (A). More preferably, it is 0.2 to 15 parts by weight, still more preferably 0.5 to 10 parts by weight.
- crosslinking agents other than a polyamine type crosslinking agent (B) for example, a sulfur crosslinking agent and an organic peroxide crosslinking agent. You may use together.
- the crosslinkable rubber composition of the present embodiment further contains a basic crosslinking accelerator.
- a basic crosslinking accelerator By further containing a basic crosslinking accelerator, the effect of the present invention becomes more remarkable.
- DBU 1,8-diazabicyclo [5,4,0] undecene-7
- DBU 1,8-diazabicyclo [5,4,0] undecene-7
- Nonene-5 1-methylimidazole, 1-ethylimidazole, 1-phenylimidazole, 1-benzylimidazole, 1,2-dimethylimidazole, 1-ethyl-2-methylimidazole, 1-methoxyethylimidazole, 1-phenyl- 2-methylimidazole, 1-benzyl-2-methylimidazole, 1-methyl-2-phenylimidazole, 1-methyl-2-benzylimidazole, 1,4-dimethylimidazole, 1,5-dimethylimidazole, 1,2, 4-trimethylimidazole, 1,4-dimethyl-2-ethylimidazole, 1-methyl-2-methoxy Imidazole, 1-methyl-2-ethoxyimidazole, 1-methyl
- Min-based basic accelerator and the like.
- guanidine-based basic crosslinking accelerators, secondary amine-based basic crosslinking accelerators, and basic crosslinking accelerators having a cyclic amidine structure are preferred, and 1,8-diazabicyclo [5,4,0] undecene-7.
- 1,5-diazabicyclo [4,3,0] nonene-5 is more preferred, and 1,8-diazabicyclo [5,4,0] undecene-7 is particularly preferred.
- the basic crosslinking accelerator having the cyclic amidine structure may form a salt with an organic carboxylic acid, alkyl phosphoric acid or the like.
- the secondary amine basic crosslinking accelerator may be a mixture of an alkylene glycol or an alcohol such as an alkyl alcohol having 5 to 20 carbon atoms, and further contains an inorganic acid and / or an organic acid. You may go out.
- the secondary amine basic cross-linking accelerator and the inorganic acid and / or organic acid may form a salt and further form a complex with the alkylene glycol.
- the blending amount of the basic crosslinking accelerator in the crosslinkable rubber composition of the present embodiment is preferably 0.1 to 20 parts by weight with respect to 100 parts by weight of the carboxyl group-containing nitrile rubber (A).
- the amount is preferably 0.2 to 15 parts by weight, more preferably 0.5 to 10 parts by weight.
- the carboxyl group-containing nitrile rubber (A) contains a halogen or a halogen compound.
- a metal acid acceptor (C) is blended in addition to the carboxyl group-containing nitrile rubber (A) and the polyamine crosslinker (B).
- the metal acid acceptor (C) is not particularly limited as long as it captures or neutralizes the halogen or halogen compound contained in the carboxyl group-containing nitrile rubber (A).
- a metal belonging to Group 2 of the periodic table Oxides and hydroxides of metals; oxides of metals belonging to Group 12 of the periodic table; oxides and hydroxides of metals belonging to Group 13 of the periodic table; and composite oxides of hydrotalcites.
- the hydrotalcite is represented by the general formula Mg x Al y (OH) 2x + 3y-2 CO 3 ⁇ wH 2 O (where x is a number from 1 to 10, y is a number from 1 to 5, and w is a real number. )), Specifically, Mg 4.5 Al 2 (OH) 13 CO 3 .3.5H 2 O, Mg 4.5 Al 2 (OH) 13 CO 3 , Mg 4 Al 2 (OH) 12 CO 3 .3.5H 2 O, Mg 6 Al 2 (OH) 16 CO 3 .4H 2 O, Mg 5 Al 2 (OH) 14 CO 3 .4H 2 O, and Mg 3 Al 2 (OH ) 10 CO 3 .1.7H 2 O and the like.
- the metal acid acceptor (C) include magnesium oxide, magnesium hydroxide, barium hydroxide, magnesium carbonate, barium carbonate, calcium oxide, calcium hydroxide, calcium silicate, calcium stearate, calcium phthalate, Calcium phosphate, zinc stearate, zinc oxide, aluminum hydroxide, hydrotalcite, tin oxide, lead oxide, dibasic lead phthalate, dibasic lead carbonate, tin stearate, basic lead phosphite, basic phosphorous acid Examples thereof include tin, basic lead sulfite, and tribasic lead sulfate.
- magnesium oxide, calcium hydroxide, zinc oxide, aluminum hydroxide, and hydrotalcite are preferable from the viewpoint of not containing heavy metals that are environmental pollution sources and having excellent thermal stability.
- Aluminum hydroxide and hydrotalcite are preferable, and aluminum hydroxide is particularly preferable from the viewpoint of maintaining the Mooney viscosity and the compression set of the cross-linked product well.
- only 1 type may be used for a metal type acid acceptor (C), and multiple types may be used together.
- the compounding amount of the metal acid acceptor (C) is not particularly limited, but is preferably 0.1 to 20 parts by weight, more preferably 0.5 to 0.5 parts by weight with respect to 100 parts by weight of the carboxyl group-containing nitrile rubber (A).
- the amount is 10 parts by weight, more preferably 1 to 5 parts by weight. If the amount of the metal acid acceptor is too small, a crosslinked rubber product that maintains good metal adhesion even after immersion in LLC cannot be obtained. On the other hand, if the amount of the metal acid acceptor is too large, the hardness of the rubber cross-linked product may become too high. Moreover, when the amount of the metal-based acid acceptor increases, the Mooney viscosity of the crosslinkable rubber composition tends to increase, and the compression set tends to decrease.
- the crosslinkable rubber composition of the present embodiment includes a compounding agent usually used in the rubber field, for example, reinforcing fillers such as carbon black and silica, and non-reinforcing properties such as calcium carbonate and clay.
- the compounding amount of these compounding agents is not particularly limited as long as it does not inhibit the purpose and effect of the present invention, and an amount corresponding to the compounding purpose can be blended.
- the type of carbon black for example, HAF, FEF, SRF, MT, etc.
- these types of amounts can be adjusted.
- the plasticizer is not particularly limited, but trimellitic acid plasticizer, pyromellitic acid plasticizer, ether ester plasticizer, polyester plasticizer, phthalic acid plasticizer, adipate ester plasticizer, phosphoric acid
- trimellitic acid plasticizer pyromellitic acid plasticizer
- ether ester plasticizer polyester plasticizer
- phthalic acid plasticizer adipate ester plasticizer
- phosphoric acid An ester plasticizer, a sebacic acid ester plasticizer, an alkyl sulfonic acid ester compound plasticizer, an epoxidized vegetable oil plasticizer, or the like can be used.
- trimellitic acid tri-2-ethylhexyl trimellitic acid isononyl ester, trimellitic acid mixed linear alkyl ester, dipentaerythritol ester, pyromellitic acid 2-ethylhexyl ester, polyether ester (molecular weight 300 to About 5,000), bis [2- (2-butoxyethoxy) ethyl adipate], dioctyl adipate, polyester based on adipic acid (molecular weight about 300 to 5000), dioctyl phthalate, diisononyl phthalate, dibutyl phthalate, phosphoric acid Examples thereof include tricresyl, dibutyl sebacate, alkyl sulfonic acid phenyl ester, epoxidized soybean oil, diheptanoate, di-2-ethylhexanoate, and didecanoate. These can be used alone or in combination.
- the crosslinkable rubber composition of the present embodiment may be blended with other polymers other than the carboxyl group-containing nitrile rubber (A) as long as the effects of the present invention are not inhibited.
- Other polymers include acrylic rubber, ethylene-acrylic acid copolymer rubber, fluorine rubber, styrene-butadiene copolymer rubber, ethylene-propylene copolymer rubber, ethylene-propylene-diene terpolymer rubber, Examples thereof include natural rubber and polyisoprene rubber.
- the blending amount in the crosslinkable rubber composition when blending other polymers is preferably 30 parts by weight or less, more preferably 20 parts by weight with respect to 100 parts by weight of the carboxyl group-containing nitrile rubber (A). Part or less, more preferably 10 parts by weight or less.
- the crosslinkable rubber composition of the present embodiment is prepared by mixing the above components, preferably in a non-aqueous system.
- the method for preparing the crosslinkable rubber composition of the present embodiment is not limited.
- the components excluding the polyamine-based crosslinking agent (B) and the heat-labile crosslinking aid are used as a Banbury mixer, an intermixer, It can be prepared by first kneading with a mixer such as a kneader, then transferring to a roll or the like and adding a polyamine-based crosslinking agent (B), a heat-labile crosslinking aid or the like and secondarily kneading.
- the Mooney viscosity (ML1 + 4, 100 ° C.) of the crosslinkable rubber composition of this embodiment is preferably from 10 to 200, more preferably from 15 to 150, even more preferably from 20 to 120, particularly preferably from the viewpoint of processability. Is 30-100.
- the rubber cross-linked product in the embodiment of the present invention is obtained by cross-linking the cross-linkable rubber composition of the present embodiment described above.
- the cross-linked rubber composition of the present embodiment uses the cross-linkable rubber composition of the present embodiment, and for example, is molded by a molding machine corresponding to a desired shape, such as an extruder, an injection molding machine, a compressor, a roll, etc. It can manufacture by performing a crosslinking reaction by heating and fixing a shape as a crosslinked product. In this case, crosslinking may be performed after molding in advance, or crosslinking may be performed simultaneously with molding.
- the molding temperature is usually 10 to 200 ° C, preferably 25 to 120 ° C.
- the crosslinking temperature is usually 100 to 200 ° C., preferably 130 to 190 ° C.
- the crosslinking time is usually 1 minute to 1 hour, preferably 2 minutes to 30 minutes.
- a heating method a general method used for crosslinking of rubber such as press heating, steam heating, oven heating, hot air heating, etc. may be appropriately selected.
- the rubber cross-linked product of the present embodiment thus obtained is particularly excellent in resistance to compression set.
- the composite in the embodiment of the present invention is a rubber-metal composite including the rubber cross-linked product of the present embodiment described above and a metal. Although it does not specifically limit as a metal which forms the composite_body
- the composite_body complex of this embodiment
- it can manufacture with the following method. That is, first, the above-described metal material (for example, a metal plate) is prepared, and the surface to be bonded to the rubber cross-linked product is subjected to a roughening process by shot blasting, polishing, hairline, dull finishing, etc. Form.
- the above-described metal material for example, a metal plate
- an adhesive layer is formed on the metal material whose surface has been roughened.
- the adhesive layer can be formed using a known adhesive, for example, a synthetic resin adhesive such as a chlorinated rubber adhesive, a polyolefin adhesive, or a phenol resin adhesive.
- a synthetic resin adhesive such as a chlorinated rubber adhesive, a polyolefin adhesive, or a phenol resin adhesive.
- such an adhesive is applied to the adhesion surface of a metal material by a brush coating method, a dipping method, a spray method, a spray method, a roll coater method, etc., and then dried at room temperature or with warm air.
- the adhesive layer can be formed by baking at a temperature of 100 to 250 ° C. for 10 to 30 minutes.
- the primer layer can be formed instead of the roughening treatment of the metal material.
- a rubber molded body is prepared by molding the crosslinkable rubber composition of the present embodiment described above into a desired shape.
- the rubber molded body can be obtained by molding the above-described crosslinkable rubber composition of the present embodiment by a molding method common to rubber processing such as extrusion molding, injection molding, transfer molding, and compression molding. .
- the crosslinkable rubber composition prepared by roll mixing or the like is supplied to the feed port of the extruder, and is softened by heating from the barrel in the process of being sent to the head portion with a screw.
- a die having a predetermined shape provided in the head portion By passing through a die having a predetermined shape provided in the head portion, a long extruded product having a target cross-sectional shape can be obtained.
- a rubber molding can be obtained by cut
- the rubber molded body and the metal material obtained above are laminated through an adhesive layer to form a laminated body, and 130 ° C. to 220 ° C., more preferably in an oven using electricity, hot air, steam or the like as a heat source. Is heated to 140 ° C. to 200 ° C. to cross-link and bond the rubber molded body and the metal material, whereby a rubber-metal composite comprising the rubber cross-linked product and metal of this embodiment can be obtained.
- cross-linking adhesion a method of heat-molding a rubber molded body and a metal material, on which an adhesive layer has been previously formed, under pressure in a mold, if necessary, using a press molding machine May be adopted.
- secondary crosslinking may be performed by heating at 130 ° C. to 220 ° C., more preferably 140 ° C. to 200 ° C. for 1 to 48 hours in an oven or the like using electricity, hot air, steam or the like as a heat source, if necessary.
- the composite is not limited to the rubber-metal composite composed of the above-mentioned rubber cross-linked product and metal, and the rubber cross-linked product and other materials other than metal (for example, thermoplastic resins other than rubber, ceramics, etc.) are further added. It can be a combined composite (eg rubber-metal-ceramic composite).
- the composite of this embodiment is obtained using the crosslinkable rubber composition of this embodiment described above, it has excellent resistance to compression set and metal adhesion, and excellent metal adhesion even after immersion in LLC. A rubber layer is maintained on the metal. Therefore, the composite of this embodiment can be suitably used for a wide range of applications such as radiator caps for automobiles and machine tools, metal gaskets, oil seals, anti-vibration rubbers, water pump seals, mechanical seals, and the like. .
- composition of carboxyl group-containing nitrile rubber and highly saturated nitrile rubber The content of each monomer unit constituting the carboxyl group-containing nitrile rubber was measured by the following method. That is, the content of mono-n-butyl maleate units was 0.2 g of a 2 mm square carboxyl group-containing nitrile rubber, 100 ml of 2-butanone was added and stirred for 4 hours, and then 20 ml of ethanol and 10 ml of water were added and stirred.
- the contents of 1,3-butadiene units and hydrogenated butadiene units were calculated by measuring iodine value (according to JIS K-6235) using nitrile rubber before hydrogenation.
- the content of the acrylonitrile unit was calculated by measuring the nitrogen content in the carboxyl group-containing nitrile rubber by the Kjeldahl method according to JIS K-6383.
- the contents of 2-methoxyethyl acrylate and n-butyl acrylate were calculated as the remaining components for each monomer unit.
- Mooney viscosity and Mooney viscosity of crosslinkable rubber composition are JIS. Measured according to K 6300. Mooney viscosity is one of the indexes for evaluating the processability of carboxyl group-containing nitrile rubber, other highly saturated nitrile rubbers, and crosslinkable rubber compositions. The smaller this value, the better the processability.
- a sample solution is prepared by dissolving 1 g of a polymer in 150 ml of a mixed solution of methyl ethyl ketone and isopropanol mixed at a volume ratio of 4: 1, and further adding 2% dilute sulfuric acid, and this is titrated with a 0.005N silver nitrate aqueous solution.
- the chlorine content was calculated.
- ⁇ Compression set resistance> By using a mold having an inner diameter of 30 mm and a ring diameter of 3 mm, the crosslinkable rubber composition was crosslinked at 170 ° C. for 20 minutes at a press pressure of 10 MPa, and then subjected to secondary crosslinking at 170 ° C. for 4 hours to form an O-ring shape. The test piece was obtained. Then, using the obtained O-ring-shaped test piece, the distance between the two planes sandwiching the O-ring-shaped test piece is maintained at 150 ° C. for 168 hours in a state compressed by 25% in the ring thickness direction Then, compression set was measured according to JIS K 6262. The compression set resistance is one of the indexes for evaluating the sealing property and the like of the rubber cross-linked product. The smaller this value, the better the compression set resistance.
- a laminate sample in which a rubber layer and a metal layer were crosslinked and bonded through an adhesive layer using a crosslinkable rubber composition was produced by the following method.
- a metal plate of 3 mm ⁇ 25 mm ⁇ 60 mm was prepared, the surface of this metal plate was roughened using 320 mesh sandpaper, and the surface of the roughened metal plate was toluene and acetone. Was used to wash.
- Stainless steel (SUS304) was used as the metal plate.
- the adhesive is applied to the surface of the roughened metal plate, left to air for 30 minutes, and then heated in an oven at a temperature of 150 ° C. for 20 minutes to perform a baking process.
- An adhesive layer was formed.
- a phenol resin adhesive (trade name “Metaloc® N-10”, manufactured by Toyo Chemical Laboratory, “Metaloc” is a registered trademark) was used.
- a 2.5 mm ⁇ 25 mm ⁇ 125 mm crosslinkable rubber composition sheet was placed on the metal plate on which the adhesive layer was formed to obtain a laminate before crosslinking.
- This laminate before cross-linking is put into a 5 mm ⁇ 25 mm ⁇ 125 mm mold, heated and compressed with a press molding machine under the conditions of pressure 10 MPa, temperature 170 ° C., 20 minutes, and subjected to secondary cross-linking at 170 ° C. for 4 hours.
- the laminated body sample for a metal-adhesion test (The contact area of rubber
- a laminate sample for a metal adhesion test produced under the same conditions as the metal adhesion test described above was mixed in a mixed liquid (LLC) in which monoethylene glycol and distilled water were mixed at a volume ratio of 1: 1. It was immersed and heated in an oven at 120 ° C. for 72 hours. After heating, the laminate sample was taken out and subjected to a peeling test (90-degree peeling test according to JIS K 6256) under the same conditions as the above-described metal adhesion test to evaluate the metal adhesion after LLC immersion.
- LLC mixed liquid
- the metal bottle was kept at 5 ° C., 0.1 part of cumene hydroperoxide (polymerization initiator) was charged, and the polymerization reaction was carried out for 16 hours while rotating the metal bottle. Next, 0.1 part of a 10% hydroquinone aqueous solution (polymerization terminator) was added to terminate the polymerization reaction, and then the residual monomer was removed using a rotary evaporator with a water temperature of 60 ° C., and acrylonitrile-butadiene-maleic acid was removed. A latex of mono n-butyl copolymer rubber (solid content concentration of about 30% by weight) was obtained.
- the latex prepared above and the palladium catalyst (equal mass exchange with 1% palladium acetate / acetone solution) so that the palladium content with respect to the dry weight of the rubber contained in the latex was 2000 ppm.
- a solution in which water was mixed was added and a hydrogenation reaction was performed at a hydrogen pressure of 3 MPa and a temperature of 50 ° C. for 6 hours to obtain a carboxyl group-containing nitrile rubber (hereinafter referred to as carboxyl group-containing highly saturated nitrile rubber) latex.
- the obtained latex of carboxyl group-containing highly saturated nitrile rubber was coagulated. Specifically, after slowly pouring the latex obtained above into a tank in which a sodium chloride aqueous solution (concentration 25%) was prepared as a coagulant, this was vigorously stirred and contact-mixed to coagulate the latex (salt Solidified). The carboxyl group-containing highly saturated nitrile rubber after solidification is filtered to take out a solid (crumb), which is vacuum-dried at 60 ° C. for 12 hours to obtain a carboxyl group-containing highly saturated nitrile rubber (A-1). It was.
- the resulting carboxyl group-containing highly saturated nitrile rubber (A-1) has an iodine value of 10, carboxyl group content of 3.2 ⁇ 10 ⁇ 2 ephr, polymer Mooney viscosity (ML1 + 4, 100 ° C.) of 45, residual The amount of chlorine was 4800 ppm.
- the acrylonitrile unit content was determined by the Kjeldahl method, the mono-n-butyl maleate unit content was determined from the carboxyl group content, and the carboxyl group-containing highly saturated nitrile rubber obtained by calculation using the remainder as 1,3-butadiene units (
- the composition of A-1) was 35.6% by weight of acrylonitrile units, 58.8% by weight of butadiene units (including hydrogenated ones), and 5.6% by weight of mono n-butyl maleate units.
- Production Example 2 Production of carboxyl group-containing highly saturated nitrile rubber (A-2) 45 parts of acrylonitrile, 6 parts of mono-n-butyl maleate, 49 parts of 1,3-butadiene A carboxyl group-containing highly saturated nitrile rubber (A-2) was obtained in the same manner as in Production Example 1, except that the respective parts were changed.
- the composition of the resulting carboxyl group-containing highly saturated nitrile rubber (A-2) was 45.4% by weight of acrylonitrile units, 49.7% by weight of butadiene units (including those hydrogenated), mono-n-butyl maleate The unit was 4.9% by weight.
- the iodine value was 9, the carboxyl group content was 3.0 ⁇ 10 ⁇ 2 ephr, the polymer Mooney viscosity (ML1 + 4, 100 ° C.) was 40, and the residual chlorine content was 4900 ppm.
- the unit was 6.5% by weight and 2-methoxyethyl acrylate was 22.9% by weight.
- the iodine value was 10, the carboxyl group content was 3.7 ⁇ 10 ⁇ 2 ephr, the polymer Mooney viscosity (ML1 + 4, 100 ° C.) was 48, and the residual chlorine content was 5000 ppm.
- the iodine value was 10, the carboxyl group content was 2.8 ⁇ 10 ⁇ 2 ephr, the polymer Mooney viscosity (ML1 + 4, 100 ° C.) was 48, and the residual chlorine content was 4900 ppm.
- the unit was 5% by weight and the n-butyl acrylate unit was 36.1% by weight.
- the iodine value was 10, the carboxyl group content was 2.9 ⁇ 10 ⁇ 2 ephr, the polymer Mooney viscosity (ML1 + 4, 100 ° C.) was 40, and the residual chlorine content was 4800 ppm.
- Latex solid content concentration of about 25% by weight
- the latex obtained above was added to an aqueous solution of aluminum sulfate in an amount of 3% by weight with respect to the nitrile rubber content and stirred to coagulate the latex, and after filtering with washing with water, Nitrile rubber was obtained by vacuum drying at 60 ° C. for 12 hours. Then, the obtained nitrile rubber was dissolved in acetone so as to have a concentration of 12%, and this was put into an autoclave, and a palladium-silica catalyst was added at 500 ppm by weight with respect to the nitrile rubber. A hydrogenation reaction was performed.
- the mixture was poured into a large amount of water to coagulate, filtered and dried to obtain a highly saturated nitrile rubber (A-6).
- the composition of the resulting highly saturated nitrile rubber (A-6) was 36.2% by weight of acrylonitrile units, 63.8% by weight of 1,3-butadiene units (including hydrogenated parts), and the iodine value was 8.
- the polymer Mooney viscosity (ML1 + 4, 100 ° C.) was 85, and the residual chlorine content was 80 ppm.
- Example 1 Using a Banbury mixer, 100 parts of the carboxyl group-containing highly saturated nitrile rubber (A-1) obtained in Production Example 1 was registered with FEF carbon black (trade name “SEAST SO”, manufactured by Tokai Carbon Co., Ltd., “SEAST”.
- Example 5 A crosslinkable rubber composition was prepared and evaluated in the same manner as in Example 1 except that the addition amount of aluminum hydroxide was changed to 1, 3, 5, and 10 parts, respectively. The results are shown in Table 1.
- Example 6 to 9 Hydrotalcite (trade name “DHT-4A”, manufactured by Kyowa Chemical Industry Co., Ltd.), magnesium oxide (trade name “Kyowa Mug 30”, manufactured by Kyowa Chemical Industry Co., Ltd., “Kyowa Mug” instead of aluminum hydroxide as a metal acid acceptor Is a registered trademark), zinc oxide (trade name “Zinc Oxide 2”, manufactured by Shodo Chemical Industry Co., Ltd.), and calcium hydroxide (trade name “Caldic 2000”, manufactured by Omi Chemical Co., Ltd., “Caldic”) Trademarks) were added and evaluated in the same manner as in Example 3 except that each was added. The results are shown in Table 1.
- Example 10 The crosslinkable rubber composition was the same as in Example 3, except that the carboxyl group-containing highly saturated nitrile rubber (A-2) obtained in Production Example 2 was used and the addition amount of hexamethylenediamine carbamate was changed to 2 parts. A product was prepared and evaluated. The results are shown in Table 1. The addition amount of hexamethylenediamine carbamate was changed in order to adjust the addition amount of the crosslinking agent in consideration of the difference in the amount of carboxylic acid serving as a crosslinking point between Production Example 1 and Production Example 2. is there.
- Example 11 Using the carboxyl group-containing highly saturated nitrile rubber (A-3) obtained in Production Example 3, the addition amount of FEF carbon black was changed to 22.5 parts, and the addition amount of hexamethylenediamine carbamate was 2.7 parts. A crosslinkable rubber composition was prepared and evaluated in the same manner as in Example 3 except that the change was made. The results are shown in Table 1. The addition amount of FEF carbon black was changed in Production Example 1 and Production Example 3 in consideration of the difference in hardness of the crosslinked rubber obtained by different amounts of acrylonitrile used. This is to adjust the addition amount.
- Example 12 Using the carboxyl group-containing highly saturated nitrile rubber (A-4) obtained in Production Example 4, the addition amount of FEF carbon black was changed to 25 parts, and the addition amount of hexamethylenediamine carbamate was changed to 1.9 parts. Except that, a crosslinkable rubber composition was prepared and evaluated in the same manner as in Example 3. The results are shown in Table 1. The reason for changing the addition amount of hexamethylenediamine carbamate is the same as the reason for changing the addition amount of hexamethylenediamine carbamate in Example 11. In addition, the addition amount of carbon black was changed in Production Example 3 and Production Example 4 in consideration of the difference in the hardness of the rubber cross-linked product obtained by using different amounts of acrylonitrile. This is to adjust the amount.
- Example 13 Similar to Example 12, except that the carboxyl group-containing highly saturated nitrile rubber (A-5) obtained in Production Example 5 was used and the addition amount of hexamethylenediamine carbamate was changed to 2.1 parts. A rubber composition was prepared and evaluated. The results are shown in Table 1.
- Example 14 instead of FEF carbon black, 20 parts of silica (trade name “Nip Seal ER”, manufactured by Tosoh Silica, “Nip Seal” is a registered trademark), and ⁇ -aminopropyltriethoxysilane (trade name “DOW CORNING TORAY Z-6011”)
- silica trade name “Nip Seal ER”, manufactured by Tosoh Silica, “Nip Seal” is a registered trademark
- ⁇ -aminopropyltriethoxysilane trade name “DOW CORNING TORAY Z-6011
- Example 15 The crosslinkable rubber composition was the same as in Example 14, except that the carboxyl group-containing highly saturated nitrile rubber (A-2) obtained in Production Example 2 was used and the addition amount of hexamethylenediamine carbamate was changed to 2 parts. A product was prepared and evaluated. The results are shown in Table 1.
- Example 16 Using the carboxyl group-containing highly saturated nitrile rubber (A-3) obtained in Production Example 3, the addition amount of silica was changed to 22.5 parts, and the addition amount of hexamethylenediamine carbamate was changed to 2.7 parts. Except that, a crosslinkable rubber composition was prepared and evaluated in the same manner as in Example 14. The results are shown in Table 1. The reason for changing the addition amount of silica is the same as the reason for changing the addition amount of carbon black in Example 11.
- Example 17 Other than using the carboxyl group-containing highly saturated nitrile rubber (A-4) obtained in Production Example 4, changing the addition amount of silica to 25 parts and changing the addition amount of hexamethylenediamine carbamate to 1.9 parts. In the same manner as in Example 14, a crosslinkable rubber composition was prepared and evaluated. The results are shown in Table 1. The reason for changing the addition amount of silica is the same as the reason for changing the addition amount of carbon black in Example 12.
- Example 18 Similar to Example 17, except that the carboxyl group-containing highly saturated nitrile rubber (A-5) obtained in Production Example 5 was used and the addition amount of hexamethylenediamine carbamate was changed to 2.1 parts. A rubber composition was prepared and evaluated. The results are shown in Table 1.
- Example 19 A crosslinkable rubber composition was prepared and evaluated in the same manner as in Example 3 except that HAF carbon black (trade name “SEAST 3” manufactured by Tokai Carbon Co., Ltd.) was used instead of FEF carbon black. The results are shown in Table 2.
- HAF carbon black trade name “SEAST 3” manufactured by Tokai Carbon Co., Ltd.
- Example 20 A crosslinkable rubber composition was prepared and evaluated in the same manner as in Example 10 except that HAF carbon black was used instead of FEF carbon black. The results are shown in Table 2.
- Example 21 A crosslinkable rubber composition was prepared and evaluated in the same manner as in Example 11 except that HAF carbon black was used instead of FEF carbon black. The results are shown in Table 2.
- Example 22 A crosslinkable rubber composition as in Example 12, except that the carboxyl group-containing highly saturated nitrile rubber (A-4) obtained in Production Example 4 was used and HAF carbon black was used instead of FEF carbon black. Were prepared and evaluated. The results are shown in Table 2.
- Example 23 A crosslinkable rubber composition was prepared and evaluated in the same manner as in Example 13 except that HAF carbon black was used instead of FEF carbon black. The results are shown in Table 2.
- Example 24 Example 3 except that the amount of FEF carbon black added was changed to 10 parts, and 20 parts MT carbon black (trade name “THERMAX N990”, manufactured by cancarb, “THERMAX” is a registered trademark) were added. A crosslinkable rubber composition was prepared and evaluated. The results are shown in Table 2.
- Example 25 A crosslinkable rubber composition was prepared and evaluated in the same manner as in Example 10 except that the amount of FEF carbon black added was changed to 10 parts and MT carbon black was further added 20 parts. The results are shown in Table 2.
- Example 26 A crosslinkable rubber composition was prepared and evaluated in the same manner as in Example 11 except that the addition amount of FEF carbon black was changed to 10 parts, and 25 parts of MT carbon black was further added. The results are shown in Table 2.
- Example 27 A crosslinkable rubber composition was prepared and evaluated in the same manner as in Example 12 except that the addition amount of FEF carbon black was changed to 12.5 parts and further 25 parts of MT carbon black was added. The results are shown in Table 2.
- Example 28 Except for using the carboxyl group-containing highly saturated nitrile rubber (A-5) obtained in Production Example 5, changing the addition amount of FEF carbon black to 12.5 parts, and further adding 25 parts MT carbon black, In the same manner as in Example 13, a crosslinkable rubber composition was prepared and evaluated. The results are shown in Table 2.
- Example 1 A crosslinkable rubber composition was prepared and evaluated in the same manner as in Example 1 except that aluminum hydroxide was not added. The results are shown in Table 2.
- Comparative Example 3 A crosslinkable rubber composition was prepared and evaluated in the same manner as Comparative Example 2 except that aluminum hydroxide was added. The results are shown in Table 2.
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Abstract
Description
本発明の実施形態における架橋性ゴム組成物は、ハロゲンまたはハロゲン化合物が含まれ且つヨウ素価が120以下であるカルボキシル基含有ニトリルゴム(A)と、ポリアミン系架橋剤(B)と、金属系受酸剤(C)とを有する架橋性ゴム組成物である。本実施形態において、ヨウ素価が120以下であるニトリルゴムは、水素化率が比較的高いニトリル共重合体ゴムである(以下、高飽和ニトリルゴムまたはカルボキシル基含有高飽和ニトリルゴムという場合がある)。
本実施形態で用いるカルボキシル基含有ニトリルゴム(A)は、ハロゲンまたはハロゲン化合物が含まれ且つヨウ素価が120以下であれば特に限定されない。このようなカルボキシル基含有ニトリルゴムとしては、例えば、α,β-エチレン性不飽和ニトリル単量体単位(a1)、α,β-エチレン性不飽和ジカルボン酸モノエステル単量体単位(a2)、および共役ジエン単量体単位(a3)を有し、該共役ジエン単量体単位(a3)の少なくとも一部が水素化されているものを用いることができる。
本実施形態で用いる架橋性ゴム組成物は、上述したカルボキシル基含有ニトリルゴム(A)に加えて、ポリアミン系架橋剤(B)を含有する。架橋剤として、ポリアミン系架橋剤(B)を用いることにより、得られるゴム架橋物の耐圧縮永久歪み性をより高めることができる。
上述のようにカルボキシル基含有ニトリルゴム(A)には、ハロゲンまたはハロゲン化合物が含まれている。発明者は、ハロゲンまたはハロゲン化合物を含むカルボキシル基含有ニトリルゴム(A)から得られたゴム架橋物が、金属に接着した状態でLLCに浸されると接着部分で界面剥離が生じる傾向があることを発見した。
本発明の実施形態におけるゴム架橋物は、上述した本実施形態の架橋性ゴム組成物を架橋してなるものである。
本発明の実施形態における複合体は、上述した本実施形態のゴム架橋物と金属とを含むゴム-金属複合体である。本実施形態の複合体を形成する金属としては、特に限定されないが、鉄、ステンレス、鋼、アルミニウム、銅、真鍮等の金属材料が挙げられる。
カルボキシル基含有ニトリルゴムを構成する各単量体単位の含有量は、以下の方法により測定した。すなわち、マレイン酸モノn-ブチル単位の含有量は、2mm角のカルボキシル基含有ニトリルゴム0.2gに、2-ブタノン100mlを加えて4時間攪拌した後、エタノール20mlおよび水10mlを加え、攪拌しながら水酸化カリウムの0.02N含水エタノール溶液を用いて、室温でチモールフタレインを指示薬とする滴定により、カルボキシル基含有ニトリルゴム100gに対するカルボキシル基のモル数を求め、求めたモル数をマレイン酸モノn-ブチル単位の量に換算することにより算出した。
カルボキシル基含有ニトリルゴムおよびその他の高飽和ニトリルゴム(以下、まとめて「ポリマー」という場合がある)のヨウ素価は、JIS K 6235に準じて測定した。
カルボキシル基含有ニトリルゴムおよびその他の高飽和ニトリルゴムのムーニー粘度(ポリマー・ムーニー粘度)(ML1+4、100℃)および各ポリマーを含有する架橋性ゴム組成物のムーニー粘度(ML1+4、100℃)は、JIS K 6300に従って測定した。ムーニー粘度は、カルボキシル基含有ニトリルゴム、その他の高飽和ニトリルゴム、および架橋性ゴム組成物の加工性等を評価する指標の一つであり、この値が小さいほど、加工性に優れる。
メチルエチルケトンとイソプロパノールを4:1の体積比で混合した混合液150mlに、ポリマー1gを溶解させ、さらに2%の希硫酸を添加した試料溶液を作製し、これを0.005Nの硝酸銀水溶液で滴定することにより塩素含有量(残留塩素量)を算出した。
内径30mm、リング径3mmの金型を用いて、架橋性ゴム組成物を170℃で20分間、プレス圧10MPaで架橋した後、170℃で4時間二次架橋を行うことにより、O-リング状の試験片を得た。そして、得られたO-リング状の試験片を用いて、O-リング状の試験片を挟んだ二つの平面間の距離をリング厚み方向に25%圧縮した状態で150℃にて168時間保持する条件で、JIS K 6262に従って、圧縮永久歪みを測定した。耐圧縮永久歪み性は、ゴム架橋物のシール性等を評価する指標の一つであり、この値が小さいほど、耐圧縮永久歪み性に優れる。
まず、架橋性ゴム組成物を使用して、ゴム層と金属層とを、接着層を介して、架橋接着させた積層体サンプルを、以下の方法により製造した。
○:ゴム層の破壊の割合が90%以上
△:ゴム層の破壊の割合が50%以上、90%未満
×:ゴム層の破壊の割合が50%未満
密閉容器中で、モノエチレングリコールと蒸留水を1:1の体積比で混合した混合液(LLC)に、上述した金属接着性試験と同じ条件で製造した金属接着性試験用の積層体サンプルを浸漬し、120℃、72時間の条件でオーブンにて加熱した。加熱後、積層体サンプルを取出し、上述した金属接着性試験と同じ条件で剥離試験(JIS K 6256に準じた90度剥離試験)を行い、LLC浸漬後の金属接着性を評価した。
(製造例1)カルボキシル基含有高飽和ニトリルゴム(A-1)の製造
金属製ボトルに、イオン交換水180部、濃度10%のドデシルベンゼンスルホン酸ナトリウム水溶液25部、アクリロニトリル37部、マレイン酸モノn-ブチル6部、及びt-ドデシルメルカプタン(分子量調整剤)0.75部の順に仕込み、内部の気体を窒素で3回置換した後、1,3-ブタジエン57部を仕込んだ。
アクリロニトリルの配合量を45部、マレイン酸モノn-ブチルの配合量を6部、1,3-ブタジエンの配合量を49部に、それぞれ変更した以外は、製造例1と同様にして、カルボキシル基含有高飽和ニトリルゴム(A-2)を得た。得られたカルボキシル基含有高飽和ニトリルゴム(A-2)の組成は、アクリロニトリル単位45.4重量%、ブタジエン単位(水素化されたものも含む)49.7重量%、マレイン酸モノn-ブチル単位4.9重量%であった。また、ヨウ素価は9、カルボキシル基含有量は3.0×10-2ephr、ポリマー・ムーニー粘度(ML1+4、100℃)は40、残留塩素量は4900ppmであった。
アクリロニトリルの配合量を23部、マレイン酸モノn-ブチルの配合量を6.5部、アクリル酸メトキシエチル30.5部、1,3-ブタジエンの配合量を40部に、それぞれ変更した以外は、製造例1と同様にして、カルボキシル基含有高飽和ニトリルゴム(A-3)を得た。得られたカルボキシル基含有高飽和ニトリルゴム(A-3)の組成は、アクリロニトリル単位24.0重量%、ブタジエン単位(水素化されたものも含む)46.6重量%、マレイン酸モノn-ブチル単位6.5重量%、アクリル酸2-メトキシエチル22.9重量%であった。また、ヨウ素価は10、カルボキシル基含有量は3.7×10-2ephr、ポリマー・ムーニー粘度(ML1+4、100℃)は48、残留塩素量は5000ppmであった。
アクリロニトリルの配合量を21部、マレイン酸モノn-ブチルの配合量を5部、アクリル酸ブチル30部、1,3-ブタジエンの配合量を44部に、それぞれ変更した以外は、製造例1と同様にして、カルボキシル基含有高飽和ニトリルゴム(A-4)を得た。得られたカルボキシル基含有高飽和ニトリルゴム(A-4)の組成は、アクリロニトリル単位20.8重量%、ブタジエン単位(水素化されたものも含む)44.2重量%、マレイン酸モノn-ブチル単位4.9重量%、アクリル酸n-ブチル単位30.1重量%であった。また、ヨウ素価は10、カルボキシル基含有量は2.8×10-2ephr、ポリマー・ムーニー粘度(ML1+4、100℃)は48、残留塩素量は4900ppmであった。
アクリロニトリルの配合量を15部、マレイン酸モノn-ブチルの配合量を5部、アクリル酸ブチル37部、1,3-ブタジエンの配合量を43部に、それぞれ変更した以外は、製造例1と同様にして、カルボキシル基含有高飽和ニトリルゴム(A-5)を得た。得られたカルボキシル基含有高飽和ニトリルゴム(A-4)の組成は、アクリロニトリル単位15.4重量%、ブタジエン単位(水素化されたものも含む)43.5重量%、マレイン酸モノn-ブチル単位5重量%、アクリル酸n-ブチル単位36.1重量%であった。また、ヨウ素価は10、カルボキシル基含有量は2.9×10-2ephr、ポリマー・ムーニー粘度(ML1+4、100℃)は40、残留塩素量は4800ppmであった。
反応器内に、イオン交換水200部、脂肪酸カリウム石鹸(脂肪酸のカリウム塩)2.25部を添加して石鹸水溶液を調製した。そして、この石鹸水溶液に、アクリロニトリル37部、およびt-ドデシルメルカプタン(分子量調整剤)0.5部をこの順に仕込み、部の気体を窒素で3回置換した後、1,3-ブタジエン63部を仕込んだ。次いで、反応器内を5℃に保ち、クメンハイドロパーオキサイド(重合開始剤)0.1部を仕込み、攪拌しながら16時間重合反応を行なった。次いで、濃度10%のハイドロキノン(重合停止剤)水溶液0.1部を加えて重合反応を停止し、水温60℃のロータリーエバポレ-タを用いて残留単量体を除去して、ニトリルゴムのラテックス(固形分濃度約25重量%)を得た。
バンバリーミキサを用いて、製造例1で得られたカルボキシル基含有高飽和ニトリルゴム(A-1)100部に、FEFカーボンブラック(商品名「シースト SO」、東海カーボン社製、「シースト」は登録商標、カーボンブラック)20部、トリメリット酸トリ-2-エチルヘキシル(商品名「ADK Cizer C-8」、ADEKA社製、「ADK Cizer」は登録商標、可塑剤)5部、4,4’-ジ-(α,α’-ジメチルベンジル)ジフェニルアミン(商品名「Naugard 445」、Crompton社製、「Naugard」は登録商標、老化防止剤)1.5部、およびステアリン酸(加工助剤)1部、ポリオキシエチレンアルキルエーテルリン酸エステル(商品名「フォスファノール RL210」、花王社製、「フォスファノール」は登録商標、加工助剤)1部を添加して混練した。
水酸化アルミニウムの添加量を1部、3部、5部、および10部にそれぞれ変更した以外は、実施例1と同様に、架橋性ゴム組成物を調製し、評価を行った。結果を表1に示す。
金属系受酸剤として水酸化アルミニウムの代わりにハイドロタルサイト(商品名「DHT-4A」、協和化学工業社製)、酸化マグネシウム(商品名「キョーワマグ 30」、協和化学工業社製、「キョーワマグ」は登録商標)、酸化亜鉛(商品名「酸化亜鉛2種」、正同化学工業社製)、および水酸化カルシウム(商品名「カルディック 2000」、近江化学工業社製、「カルディック」は登録商標)をそれぞれ添加した以外は、実施例3と同様に、架橋性ゴム組成物を調製し、評価を行った。結果を表1に示す。
製造例2で得られたカルボキシル基含有高飽和ニトリルゴム(A-2)を使用し、ヘキサメチレンジアミンカルバメートの添加量を2部に変更した以外は、実施例3と同様に、架橋性ゴム組成物を調製し、評価を行った。結果を表1に示す。なお、ヘキサメチレンジアミンカルバメートの添加量を変更したのは、製造例1と製造例2で、架橋点となるカルボン酸の量が異なることを考慮して、架橋剤の添加量を調整するためである。
製造例3で得られたカルボキシル基含有高飽和ニトリルゴム(A-3)を使用し、FEFカーボンブラックの添加量を22.5部に変更し、ヘキサメチレンジアミンカルバメートの添加量を2.7部に変更した以外は、実施例3と同様に、架橋性ゴム組成物を調製し、評価を行った。結果を表1に示す。なお、FEFカーボンブラックの添加量を変更したのは、製造例1と製造例3で、アクリロニトリルの使用量が異なることによって得られるゴム架橋物の硬さが異なることを考慮して、カーボンブラックの添加量を調整するためである。また、ヘキサメチレンジアミンカルバメートの添加量を変更したのは、製造例1と製造例3で、架橋点となるカルボン酸の量が異なることを考慮して、架橋剤の添加量を調整するためである。
製造例4で得られたカルボキシル基含有高飽和ニトリルゴム(A-4)を使用し、FEFカーボンブラックの添加量を25部に変更し、ヘキサメチレンジアミンカルバメートの添加量を1.9部に変更した以外は、実施例3と同様に、架橋性ゴム組成物を調製し、評価を行った。結果を表1に示す。なお、ヘキサメチレンジアミンカルバメートの添加量を変更したのは、実施例11でヘキサメチレンジアミンカルバメートの添加量を変更した理由と同じである。また、カーボンブラックの添加量を変更したのは、製造例3と製造例4で、アクリロニトリルの使用量が異なることによって得られるゴム架橋物の硬さが異なることを考慮して、カーボンブラックの添加量を調整するためである。
製造例5で得られたカルボキシル基含有高飽和ニトリルゴム(A-5)を使用し、ヘキサメチレンジアミンカルバメートの添加量を2.1部に変更した以外は、実施例12と同様に、架橋性ゴム組成物を調製し、評価を行った。結果を表1に示す。
FEFカーボンブラックの代わりにシリカ(商品名「ニップシール ER」、東ソー・シリカ社製、「ニップシール」は登録商標)20部、及びγ-アミノプロピルトリエトキシシラン(商品名「DOW CORNING TORAY Z-6011」、東レ・ダウコーニング社製、シランカップリング剤)を添加した以外は、実施例3と同様に、架橋性ゴム組成物を調製し、評価を行った。結果を表1に示す。
製造例2で得られたカルボキシル基含有高飽和ニトリルゴム(A-2)を使用し、ヘキサメチレンジアミンカルバメートの添加量を2部に変更した以外は、実施例14と同様に、架橋性ゴム組成物を調製し、評価を行った。結果を表1に示す。
製造例3で得られたカルボキシル基含有高飽和ニトリルゴム(A-3)を使用し、シリカの添加量を22.5部に変更し、ヘキサメチレンジアミンカルバメートの添加量を2.7部に変更した以外は、実施例14と同様に、架橋性ゴム組成物を調製し、評価を行った。結果を表1に示す。なお、シリカの添加量を変更したのは、実施例11でカーボンブラックの添加量を変更した理由と同じである。
製造例4で得られたカルボキシル基含有高飽和ニトリルゴム(A-4)を使用し、シリカの添加量を25部に変更し、ヘキサメチレンジアミンカルバメートの添加量を1.9部に変更した以外は、実施例14と同様に、架橋性ゴム組成物を調製し、評価を行った。結果を表1に示す。なお、シリカの添加量を変更したのは、実施例12でカーボンブラックの添加量を変更した理由と同じである。
製造例5で得られたカルボキシル基含有高飽和ニトリルゴム(A-5)を使用し、ヘキサメチレンジアミンカルバメートの添加量を2.1部に変更した以外は、実施例17と同様に、架橋性ゴム組成物を調製し、評価を行った。結果を表1に示す。
FEFカーボンブラックの代わりにHAFカーボンブラック(商品名「シースト 3」、東海カーボン社製)を使用した以外は、実施例3と同様に、架橋性ゴム組成物を調製し、評価を行った。結果を表2に示す。
FEFカーボンブラックの代わりにHAFカーボンブラックを使用した以外は、実施例10と同様に、架橋性ゴム組成物を調製し、評価を行った。結果を表2に示す。
FEFカーボンブラックの代わりにHAFカーボンブラックを使用した以外は、実施例11と同様に、架橋性ゴム組成物を調製し、評価を行った。結果を表2に示す。
製造例4で得られたカルボキシル基含有高飽和ニトリルゴム(A-4)を使用し、FEFカーボンブラックの代わりにHAFカーボンブラックを使用した以外は、実施例12と同様に、架橋性ゴム組成物を調製し、評価を行った。結果を表2に示す。
FEFカーボンブラックの代わりにHAFカーボンブラックを使用した以外は、実施例13と同様に、架橋性ゴム組成物を調製し、評価を行った。結果を表2に示す。
FEFカーボンブラックの添加量を10部に変更し、さらにMTカーボンブラック(商品名「THERMAX N990」、cancarb社製、「THERMAX」は登録商標)を20部添加した以外は、実施例3と同様に、架橋性ゴム組成物を調製し、評価を行った。結果を表2に示す。
FEFカーボンブラックの添加量を10部に変更し、さらにMTカーボンブラックを20部添加した以外は、実施例10と同様に、架橋性ゴム組成物を調製し、評価を行った。結果を表2に示す。
FEFカーボンブラックの添加量を10部に変更し、さらにMTカーボンブラックを25部添加した以外は、実施例11と同様に、架橋性ゴム組成物を調製し、評価を行った。結果を表2に示す。
FEFカーボンブラックの添加量を12.5部に変更し、さらにMTカーボンブラックを25部添加した以外は、実施例12と同様に、架橋性ゴム組成物を調製し、評価を行った。結果を表2に示す。
製造例5で得られたカルボキシル基含有高飽和ニトリルゴム(A-5)を使用し、FEFカーボンブラックの添加量を12.5部に変更し、さらにMTカーボンブラックを25部添加した以外は、実施例13と同様に、架橋性ゴム組成物を調製し、評価を行った。結果を表2に示す。
水酸化アルミニウムを添加しなかった以外は、実施例1と同様に、架橋性ゴム組成物を調製し、評価を行った。結果を表2に示す。
製造例6で得られた高飽和ニトリルゴム(A-6)を使用し、ポリオキシエチレンアルキルエーテルリン酸エステル、ヘキサメチレンジアミンカルバメート、1,8-ジアザビシクロ[5,4,0]ウンデセン-7(DBU)、及び水酸化アルミニウムをそれぞれ添加せず、1,3-ビス(t-ブチルパーオキシイソプロピル)ベンゼン(40%品)8部を添加した以外は、実施例1と同様に、架橋性ゴム組成物を調製し、評価を行った。結果を表2に示す。
水酸化アルミニウムを添加した以外は、比較例2と同様に、架橋性ゴム組成物を調製し、評価を行った。結果を表2に示す。
Claims (7)
- ハロゲンまたはハロゲン化合物が含まれ且つヨウ素価が120以下であるカルボキシル基含有ニトリルゴム(A)と、
ポリアミン系架橋剤(B)と、
金属系受酸剤(C)とを有する架橋性ゴム組成物。 - 前記カルボキシル基含有ニトリルゴム(A)は、
α,β-エチレン性不飽和ニトリル単量体単位(a1)5~60重量%と、
α,β-エチレン性不飽和ジカルボン酸モノエステル単量体単位(a2)0.5~12重量%と、
共役ジエン単量体単位(a3)20~90重量%とを有し、
前記共役ジエン単量体単位(a3)の少なくとも一部が水素化されている請求項1に記載の架橋性ゴム組成物。 - 前記カルボキシル基含有ニトリルゴム(A)100重量部に対して、前記金属系受酸剤(C)が0.1~20重量部である請求項1または2に記載の架橋性ゴム組成物。
- 前記金属系受酸剤(C)が、水酸化アルミニウムまたはハイドロタルサイトである請求項1乃至3のいずれか1項に記載の架橋性ゴム組成物。
- 前記カルボキシル基含有ニトリルゴム(A)100重量部に対して、前記金属系受酸剤(C)が1~5重量部である請求項1乃至4のいずれか1項に記載の架橋性ゴム組成物。
- 請求項1乃至5のいずれか1項に記載の架橋性ゴム組成物を架橋してなるゴム架橋物。
- 請求項6に記載のゴム架橋物と金属とを含む複合体。
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CN201780063637.7A CN109890889A (zh) | 2016-10-31 | 2017-10-24 | 交联性橡胶组合物、橡胶交联物和复合物 |
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EP3533826A4 (en) | 2020-07-01 |
KR20190077347A (ko) | 2019-07-03 |
US20190256693A1 (en) | 2019-08-22 |
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