WO2017146046A1 - ニトリル共重合体ゴム組成物、架橋性ゴム組成物およびゴム架橋物 - Google Patents
ニトリル共重合体ゴム組成物、架橋性ゴム組成物およびゴム架橋物 Download PDFInfo
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- WO2017146046A1 WO2017146046A1 PCT/JP2017/006374 JP2017006374W WO2017146046A1 WO 2017146046 A1 WO2017146046 A1 WO 2017146046A1 JP 2017006374 W JP2017006374 W JP 2017006374W WO 2017146046 A1 WO2017146046 A1 WO 2017146046A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
- C08C1/00—Treatment of rubber latex
- C08C1/14—Coagulation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L9/02—Copolymers with acrylonitrile
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
- C08K5/0016—Plasticisers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/10—Esters; Ether-esters
- C08K5/101—Esters; Ether-esters of monocarboxylic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L27/00—Compositions of homopolymers or 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 halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or 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 halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/04—Compositions of homopolymers or 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 halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08L27/06—Homopolymers or copolymers of vinyl chloride
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L9/02—Copolymers with acrylonitrile
- C08L9/04—Latex
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
Definitions
- the present invention uses a nitrile copolymer rubber composition capable of providing a rubber cross-linked product excellent in cold resistance, ozone resistance, oil resistance, and compression set, and the nitrile copolymer rubber composition.
- the crosslinkable rubber composition and rubber cross-linked product obtained in this way.
- rubber nitrile copolymer rubber containing an ⁇ , ⁇ -ethylenically unsaturated nitrile monomer unit and a conjugated diene monomer unit has been known as a rubber having excellent oil resistance.
- rubber nitrile copolymer rubber
- it is used as a material for rubber products around various oils of automobiles such as fuel hoses, gaskets, packings, and oil seals.
- nitrile copolymer rubber also has these characteristics. There is a need for improvement.
- Patent Document 1 acrylic resin or vinyl chloride resin 10 to 100 per 100 parts by weight of nitrile copolymer rubber having 55 to 80% by weight of ⁇ , ⁇ -ethylenically unsaturated nitrile monomer units. Vulcanizability to give a rubber vulcanizate having an embrittlement temperature of ⁇ 50 to ⁇ 5 ° C., containing 5 parts by weight, 5 to 500 parts by weight of a filler, 0.1 to 200 parts by weight of a plasticizer and a vulcanizing agent.
- Nitrile copolymer rubber compositions are disclosed.
- the rubber cross-linked product obtained by using the rubber composition described in Patent Document 1 does not have sufficient cold resistance and ozone resistance, and therefore further improvement has been demanded.
- the present invention has been made in view of such a situation, and a nitrile copolymer rubber composition capable of providing a rubber cross-linked product excellent in cold resistance, ozone resistance, oil resistance, and compression set.
- Another object of the present invention is to provide a crosslinkable rubber composition and a rubber cross-linked product obtained by using the nitrile copolymer rubber composition.
- nitrile copolymer rubber containing ⁇ , ⁇ -ethylenically unsaturated nitrile monomer units in a proportion of 22 to 45% by weight has an average value. It has been found that the above object can be achieved by a rubber composition comprising a predetermined degree of polymerization of a vinyl chloride resin having a polymerization degree of 1200 to 2200, and the present invention has been completed.
- the average degree of polymerization of the vinyl chloride resin (B) is ⁇
- the vinyl chloride resin (B) is contained with respect to 100 parts by weight of the nitrile copolymer rubber (A).
- the ratio is ⁇ parts by weight
- the product ( ⁇ ⁇ ⁇ ) of the average polymerization degree ⁇ of the vinyl chloride resin (B) and the content ratio ⁇ of the vinyl chloride resin (B) is 100,000 or more.
- the content ratio of the ⁇ , ⁇ -ethylenically unsaturated nitrile monomer unit in the nitrile copolymer rubber (A) is ⁇ wt%
- the ratio (( ⁇ ⁇ ⁇ ) / ⁇ ) to the content ratio ⁇ of the, ⁇ -ethylenically unsaturated nitrile monomer unit is preferably 3,000 to 6,000.
- the nitrile copolymer rubber composition of the present invention preferably further contains liquid nitrile rubber (C).
- the content ratio of the liquid nitrile rubber (C) is preferably 5 to 50 parts by weight with respect to 100 parts by weight of the nitrile copolymer rubber (A).
- the nitrile copolymer rubber composition of the present invention preferably further contains a plasticizer, and the plasticizer is preferably an ester compound of a dibasic acid and an ether bond-containing alcohol.
- blending a crosslinking agent with the said nitrile copolymer rubber composition is provided.
- crosslinking the said crosslinkable rubber composition is provided.
- the rubber cross-linked product of the present invention preferably has an embrittlement temperature of ⁇ 30 ° C. or lower.
- a nitrile copolymer rubber composition capable of providing a rubber cross-linked product excellent in cold resistance, ozone resistance, oil resistance, and compression set, and such nitrile copolymer rubber A rubber cross-linked product obtained by using the composition and excellent in cold resistance, ozone resistance, oil resistance, and compression set can be provided.
- the nitrile copolymer rubber composition of the present invention comprises a nitrile copolymer rubber (A) containing 22 to 45% by weight of an ⁇ , ⁇ -ethylenically unsaturated nitrile monomer unit, And a vinyl chloride resin (B) having an average degree of polymerization of 1200 to 2200, and the content ratio of the vinyl chloride resin (B) to 100 parts by weight of the nitrile copolymer rubber (A) is 70 to 140 parts by weight.
- This is a composition of a nitrile copolymer rubber.
- Nitrile copolymer rubber (A) used in the present invention is a rubber containing at least 22 to 45% by weight of an ⁇ , ⁇ -ethylenically unsaturated nitrile monomer unit and has a solid state at 25 ° C. (No fluidity at 25 ° C.).
- the content ratio of the ⁇ , ⁇ -ethylenically unsaturated nitrile monomer unit is 22 to 45% by weight, preferably 26 to 40% by weight, more preferably 30 to 36% by weight based on the total monomer units. %. If the content of the ⁇ , ⁇ -ethylenically unsaturated nitrile monomer unit is too low, the oil resistance of the resulting rubber cross-linked product will deteriorate. On the other hand, if the content ratio is too high, the cold resistance of the resulting rubber cross-linked product is deteriorated.
- the entire rubber mixture having a different monomer composition that is, having a monomer composition of each other.
- the content ratio of the ⁇ , ⁇ -ethylenically unsaturated nitrile monomer unit in the different nitrile copolymer rubber (A) in the solid state at 25 ° C. may be within the above range.
- nitrile copolymer rubber (A) a rubber ( ⁇ ) containing 25% by weight of an ⁇ , ⁇ -ethylenically unsaturated nitrile monomer unit, a rubber ( ⁇ ) containing 35% by weight, are mixed at 50:50 (weight ratio), the content ratio of the ⁇ , ⁇ -ethylenically unsaturated nitrile monomer unit in the entire nitrile copolymer rubber (A) is 30% by weight.
- diene monomer units or ⁇ -olefin monomer units the same applies to diene monomer units or ⁇ -olefin monomer units.
- the ⁇ , ⁇ -ethylenically unsaturated nitrile monomer forming the ⁇ , ⁇ -ethylenically unsaturated nitrile monomer unit is not particularly limited as long as it is an ⁇ , ⁇ -ethylenically unsaturated compound having a nitrile group.
- the nitrile copolymer rubber (A) used in the present invention also contains a diene monomer unit or an ⁇ -olefin monomer unit so that the resulting rubber cross-linked product has rubber elasticity. Is preferred.
- diene monomer examples include 1,3-butadiene, isoprene, 2,3-dimethyl- 1, 3-butadiene, 1,3- pentadiene and the like, preferably conjugated dienes having 4 or more carbon atoms; And non-conjugated dienes having preferably 5 to 12 carbon atoms, such as 4-pentadiene, 1,4-hexadiene, vinylnorbornene, and dicyclopentadiene. Of these, conjugated dienes are preferred, and 1,3-butadiene is more preferred.
- the ⁇ -olefin monomer preferably has 2 to 12 carbon atoms, and examples thereof include ethylene, propylene, 1-butene, 4-methyl- 1-pentene, 1-hexene and 1-octene. .
- the content ratio of the diene monomer unit or ⁇ -olefin monomer unit in the nitrile copolymer rubber (A) is preferably 55 to 78% by weight, more preferably 60 to 74%, based on the total monomer units. % By weight, more preferably 61-74% by weight, still more preferably 64-70% by weight.
- the nitrile copolymer rubber (A) used in the present invention is not limited to these. It may contain a unit of another monomer copolymerizable with the monomer forming the monomer unit.
- the content ratio of such other monomer units is preferably 30% by weight or less, more preferably 20% by weight or less, and still more preferably 10% by weight or less based on the total monomer units.
- Examples of such other copolymerizable monomers include aromatic vinyl compounds such as styrene, ⁇ -methylstyrene and vinyltoluene; fluoroethyl vinyl ether, fluoropropyl vinyl ether, o-trifluoromethyl styrene, pentafluoro Fluorine-containing vinyl compounds such as vinyl benzoate, difluoroethylene and tetrafluoroethylene; ⁇ -olefin compounds such as ethylene, propylene, 1-butene, 4-methyl-1-pentene, 1-hexene and 1-octene; acrylic acid, ⁇ , ⁇ -ethylenically unsaturated carboxylic acids such as methacrylic acid, maleic acid, maleic anhydride, itaconic acid, itaconic anhydride, fumaric acid, fumaric anhydride and the like; methyl (meth) acrylate, (meth) Ethyl acrylate, (meth) acrylic acid buty
- the Mooney viscosity (ML1 + 4, 100 ° C.) of the nitrile copolymer rubber (A) is usually 3 to 250, preferably 15 to 180, more preferably 20 to 160. If the polymer Mooney viscosity of the nitrile copolymer rubber (A) is too low, the strength characteristics of the resulting rubber cross-linked product may be reduced. On the other hand, if the polymer Mooney viscosity is too high, processability may be deteriorated.
- the Mooney viscosity of the nitrile copolymer rubber (A) can be measured, for example, according to JIS K6300.
- the method for producing the nitrile copolymer rubber (A) used in the present invention is not particularly limited, but the above-mentioned monomers are copolymerized and, if necessary, carbon-carbon double bonds in the resulting copolymer. Can be produced by hydrogenation.
- the polymerization method is not particularly limited and may be a known emulsion polymerization method or solution polymerization method. From the viewpoint of industrial productivity, the emulsion polymerization method is preferable. In emulsion polymerization, in addition to an emulsifier, a polymerization initiator, and a molecular weight modifier, a commonly used polymerization auxiliary material 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 salts of fatty acids such as linolenic acid, alkylbenzene sulfonates such as sodium dodecylbenzenesulfonate, anionic emulsifiers such as higher alcohol sulfates and alkylsulfosuccinates; sulfoesters of ⁇ , ⁇ -unsaturated carboxylic acids, ⁇ , ⁇ -unsaturated carboxylic acid sulfate esters, sulfoalkyl aryl ethers and other copolymerizable emulsifiers.
- the amount of the emulsifier added is preferably 0.1 to 10 parts
- 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 addition amount of the polymerization initiator is preferably 0.01 to 2 parts by weight with respect to 100 parts by weight of the monomer used for the polymerization.
- Water is usually used as the emulsion polymerization medium.
- the amount of water is preferably 80 to 500 parts by weight, more preferably 80 to 300 parts by weight with respect to 100 parts by weight of the monomer used for the polymerization.
- 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 copolymer rubber (A) used in the present invention is obtained by hydrogenating at least a part of unsaturated bond portions in the diene monomer unit of the copolymer obtained by copolymerization as described above ( Hydrogenated nitrile copolymer rubber may also be used.
- the method for hydrogenation is not particularly limited, and a known method may be employed.
- the iodine value is preferably in the range of 0 to 70, more preferably in the range of 4 to 60.
- the nitrile of the present invention depends on the compounding agent used when obtaining the crosslinkable rubber composition.
- the nitrile copolymer rubber (A) is additionally added together with a crosslinking agent or the like when obtaining a crosslinkable rubber composition to be described later. It is good also as such an aspect.
- Vinyl chloride resin (B) The nitrile copolymer rubber composition of the present invention contains a vinyl chloride resin (B) having an average degree of polymerization of 1200 to 2200 in addition to the nitrile copolymer rubber (A) described above.
- the vinyl chloride resin (B) is not particularly limited as long as the main constituent monomer is vinyl chloride and the average degree of polymerization thereof is in the range of 1200 to 2200. Is preferably 50 to 100% by weight, more preferably 60 to 100% by weight, and still more preferably 70 to 100% by weight.
- the average degree of polymerization of the vinyl chloride resin (B) is 1200 to 2200, preferably 1250 to 2100, more preferably 1300 to 2000, still more preferably 1300 to 1900, and still more preferably 1400 to 1900. If the average degree of polymerization is too low, the ozone resistance of the resulting rubber cross-linked product is deteriorated. On the other hand, if the average degree of polymerization is too high, mixing with the nitrile copolymer rubber (A) becomes difficult. It cannot mix
- the average degree of polymerization becomes too high, the polymer Mooney viscosity of the mixture becomes too high, making it difficult to mix with the nitrile copolymer rubber (A), or vinyl chloride.
- the melting point of the resin (B) becomes too high, and mixing while melting becomes difficult. As a result, the resin (B) cannot be blended with the nitrile copolymer rubber (A) and cannot be made into a rubber composition.
- the average degree of polymerization of the vinyl chloride resin (B) can be measured, for example, by the solution viscosity method specified in JIS K6721.
- the glass transition temperature (Tg) of the vinyl chloride resin (B) is preferably 50 to 180 ° C.
- the vinyl chloride resin (B) used in the present invention may be one obtained by copolymerizing other monomers copolymerizable with vinyl chloride in addition to the main constituent monomer vinyl chloride.
- examples of such other monomers include (meth) acrylic acid alkyl esters having an alkyl group having 1 to 20 carbon atoms; aromatic vinyl compounds such as styrene, vinyl toluene and ⁇ -methyl styrene; acrylonitrile, methacrylo Vinyl cyanide compounds such as nitrile and vinylidene cyanide; vinyl ester compounds such as vinyl acetate and vinyl propionate; vinyl ether compounds such as ethyl vinyl ether, cetyl vinyl ether and hydroxybutyl vinyl ether; ⁇ -hydroxyethyl (meth) acrylate, (meta ) 3-hydroxybutyl acrylate, butoxy (meth) acrylate Examples thereof include hydroxyl group or alkoxy group-containing unsaturated carboxylic acid ester compounds such
- the polymerization method for producing the vinyl chloride resin (B) used in the present invention is not particularly limited, and examples thereof include emulsion polymerization, seeding emulsion polymerization, fine suspension polymerization, and suspension polymerization.
- the content of the vinyl chloride resin (B) in the nitrile copolymer rubber composition of the present invention is 70 to 140 parts by weight, preferably 75 parts per 100 parts by weight of the nitrile copolymer rubber (A). It is ⁇ 135 parts by weight, more preferably 80 to 130 parts by weight. If the content of the vinyl chloride resin (B) is too small, the ozone resistance of the resulting rubber cross-linked product is deteriorated. On the other hand, if the content is too large, mixing with the nitrile copolymer rubber (A) becomes difficult. Processability is extremely lowered, and it becomes impossible to obtain a rubber composition, and cold resistance is lowered.
- the content of the vinyl chloride resin (B) is too large, the polymer Mooney viscosity of the mixture becomes too high, and the mixing operation with the nitrile copolymer rubber (A) becomes difficult. The processability is extremely lowered and cannot be made into a rubber composition.
- the average degree of polymerization of the vinyl chloride resin (B) is ⁇
- the content ratio of the vinyl chloride resin (B) to 100 parts by weight of the nitrile copolymer rubber (A) is ⁇ parts by weight.
- the product ( ⁇ ⁇ ⁇ ) of the average degree of polymerization ⁇ of the vinyl chloride resin (B) and the content ratio ⁇ of the vinyl chloride resin (B) is preferably 100,000 or more.
- the upper limit of the product ( ⁇ ⁇ ⁇ ) is usually 200,000 or less from the viewpoint of kneadability with respect to the nitrile copolymer rubber (A) and cold resistance.
- the product ( ⁇ ⁇ ⁇ ) is preferably 105,000 to 195,000, more preferably 110,000 to 190,000, particularly preferably 120,000 to 180,000.
- the content ratio of the vinyl chloride resin (B) to 100 parts by weight of the nitrile copolymer rubber (A) is 82 parts by weight.
- the ozone resistance of the obtained rubber cross-linked product is relatively greatly influenced by the average degree of polymerization of the vinyl chloride resin (B) and the content ratio of the vinyl chloride resin (B).
- the ozone resistance is relatively greatly influenced by the average degree of polymerization of the vinyl chloride resin (B) and the content ratio of the vinyl chloride resin (B).
- the product ( ⁇ ⁇ ⁇ ) described above is used.
- the content ratio ⁇ of the ⁇ , ⁇ -ethylenically unsaturated nitrile monomer unit (( ⁇ ⁇ ⁇ ) / ⁇ ) is preferably in the range of 3,000 to 6,000.
- the ratio (( ⁇ ⁇ ⁇ ) / ⁇ ) is preferably 3,200 to 5,900, more preferably 3,400 to 5,800, and particularly preferably 3,600 to 5,700.
- the content ratio of the vinyl chloride resin (B) to 100 parts by weight of the nitrile copolymer rubber (A) is 82 parts by weight.
- the nitrile copolymer rubber is related to the degree of polymerization and the content ratio of the vinyl chloride resin (B).
- the nitrile copolymer rubber composition of the present invention preferably contains a liquid nitrile rubber (C) in addition to the nitrile copolymer rubber (A) and the vinyl chloride resin (B) described above. .
- a liquid nitrile rubber (C) in addition to the nitrile copolymer rubber (A) and the vinyl chloride resin (B) described above.
- the liquid nitrile rubber (C) used in the present invention is a nitrile copolymer rubber having a liquid state at 25 ° C. (having fluidity at 25 ° C.).
- the liquid nitrile rubber (C) used in the present invention has, for example, a Mooney viscosity measured in accordance with JIS K6300, usually 1 or less, or a viscosity too low to measure the Mooney viscosity.
- the liquid nitrile rubber (C) used in the present invention is usually an ⁇ , ⁇ -ethylenically unsaturated nitrile monomer, a conjugated diene monomer, and other copolymerizable with these, which are used as necessary. It is obtained by copolymerizing with a monomer.
- ⁇ , ⁇ -ethylenically unsaturated nitrile monomer those similar to the nitrile copolymer rubber (A) described above can be used, and acrylonitrile is preferred.
- conjugated diene monomer those similar to the nitrile copolymer rubber (A) described above can be used, and 1,3-butadiene is preferred.
- the thing similar to the nitrile copolymer rubber (A) mentioned above can be used.
- the content ratio of the ⁇ , ⁇ -ethylenically unsaturated nitrile monomer unit in the liquid nitrile rubber (C) used in the present invention is preferably 10 to 60% by weight, more preferably 20%, based on all monomer units. -50% by weight, more preferably 25-40% by weight.
- the content ratio of the conjugated diene monomer unit in the liquid nitrile rubber (C) is preferably 40 to 90% by weight, more preferably 50 to 80% by weight, and still more preferably in all monomer units. Is 60 to 75% by weight.
- the content ratio of the other copolymerizable monomer in the liquid nitrile rubber (C) is preferably 30% by weight or less, more preferably 20% by weight or less, and particularly preferably 10% in all monomer units. % By weight or less.
- the liquid nitrile rubber (C) used in the present invention has a viscosity measured with a B-type viscometer at a temperature of 70 ° C. and a rotation speed of 10 rpm, preferably 1 to 30 Pa ⁇ s, more preferably 1 -20 Pa ⁇ s, more preferably 1 to 10 Pa ⁇ s, particularly preferably 3 to 9 Pa ⁇ s.
- the liquid nitrile rubber (C) used in the present invention has a polystyrene-equivalent weight average molecular weight using gel permeation chromatography, preferably 1,000 to 100,000, more preferably 3,000 to 50,000, More preferably, it is 3,000 to 30,000, and particularly preferably 3,000 to 15,000.
- the production method of the liquid nitrile rubber (C) used in the present invention is not particularly limited, and a known production method can be adopted.
- a large amount of a molecular weight regulator is used, and the above-mentioned monomers are emulsion polymerized. And a method of coagulation and heating and drying.
- liquid nitrile rubber (C) you may use commercially available liquid nitrile rubber, for example.
- the content of the liquid nitrile rubber (C) in the nitrile copolymer rubber composition of the present invention is preferably 5 to 50 parts by weight, more preferably 100 parts by weight of the nitrile copolymer rubber (A).
- the amount is 10 to 45 parts by weight, more preferably 15 to 40 parts by weight.
- the nitrile copolymer rubber composition of the present invention contains the liquid nitrile rubber (C), and the nitrile copolymer rubber composition is blended with a crosslinking agent and the like, and a crosslinkable rubber composition described later. It is good also as an aspect which mix
- the nitrile copolymer rubber composition of the present invention includes the above-mentioned nitrile copolymer rubber (A) and vinyl chloride resin (B), and liquid nitrile rubber (C) used as necessary.
- it may contain other compounding agents.
- other compounding agents include plasticizers, anti-aging agents, and stabilizers.
- plasticizer examples include ester compounds of adipic acid and an ether-containing alcohol such as dibutoxyethyl adipate and di (butoxyethoxyethyl) adipate; dibutoxyethyl azelate, di (butoxyethoxy) azelate Ester compounds of azelaic acid and ether-containing alcohols such as ethyl); ester compounds of sebacic acid and ether-containing alcohols such as dibutoxyethyl sebacate and di (butoxyethoxyethyl) sebacate; dibutoxyethyl phthalate; Ester compounds of phthalic acid such as di (butoxyethoxyethyl) phthalate with alcohols containing ether bonds; diphthaloxyethyl isophthalate, isophthalic acids such as di (butoxyethoxyethyl) isophthalate and ether bond-containing al Ester compounds with azole; di- (2-ethylhexyl)
- dibasic acids such as adipic acid, azelaic acid, sebacic acid and phthalic acid, and an ether bond from the viewpoint that the cold resistance and oil resistance of the resulting rubber cross-linked product can be improved.
- An ester compound with a contained alcohol is preferable, an ester compound with adipic acid and an ether bond-containing alcohol is more preferable, and di (butoxyethoxyethyl) adipate is particularly preferable.
- the content of the plasticizer in the nitrile copolymer rubber composition of the present invention is preferably 3 to 100 parts by weight, more preferably 5 to 5 parts by weight with respect to 100 parts by weight of the nitrile copolymer rubber (A). 80 parts by weight, more preferably 10 to 60 parts by weight.
- the anti-aging agent is not particularly limited, but phenol-based, amine-based, benzimidazole-based, phosphoric acid-based anti-aging agents can be used.
- the content of the anti-aging agent in the nitrile copolymer rubber composition of the present invention is preferably 0.5 to 20 parts by weight, more preferably 100 parts by weight of the nitrile copolymer rubber (A). Is 1 to 15 parts by weight, more preferably 1.5 to 10 parts by weight.
- the nitrile copolymer rubber composition of the present invention is prepared by mixing each component including the nitrile copolymer rubber (A) and the vinyl chloride resin (B), preferably in a non-aqueous system. Mixing can be performed using, for example, a mixer such as a Banbury mixer, an internal mixer, or a kneader.
- the mixing temperature in mixing each component including the nitrile copolymer rubber (A) and the vinyl chloride resin (B) is not particularly limited, but the mixing is performed at a temperature equal to or higher than the melting point of the vinyl chloride resin (B). It is preferable to perform mixing at a temperature higher by 5 ° C.
- the mixing is preferably performed at 160 ° C or higher, more preferably performed at 165 ° C or higher, and further preferably performed at 170 ° C or higher.
- each component including the nitrile copolymer rubber (A) and the vinyl chloride resin (B) can be mixed in an aqueous system.
- the latex of the nitrile copolymer rubber (A) obtained by polymerization is mixed with the vinyl chloride resin (B) in a latex state produced by a conventionally known emulsion polymerization method or suspension polymerization method, or other components. (Latex blend).
- crosslinkable rubber composition of the present invention is obtained by blending a crosslinking agent with the nitrile copolymer rubber composition of the present invention described above.
- the crosslinking agent include a sulfur-based crosslinking agent and an organic peroxide crosslinking agent. Although these can be used individually by 1 type or in combination of multiple types, it is preferable to use a sulfur type crosslinking agent.
- Sulfur-based cross-linking agents include powdered sulfur, sulfur white, precipitated sulfur, colloidal sulfur, surface-treated sulfur, insoluble sulfur, etc .; sulfur chloride, sulfur dichloride, morpholine disulfide, alkylphenol disulfide, dibenzothiazyl disulfide, caprolactam disulfide And sulfur-containing compounds such as phosphorus-containing polysulfides and polymer polysulfides; sulfur-donating compounds such as tetramethylthiuram disulfide, selenium dimethyldithiocarbamate, and 2- (4′-morpholinodithio) benzothiazole. These can be used individually by 1 type or in combination of multiple types.
- organic peroxide crosslinking agents include dicumyl peroxide, cumene hydroperoxide, t-butylcumyl peroxide, paramentane hydroperoxide, di-t-butyl peroxide, 1,3-bis (t-butylperoxyisopropyl) benzene, 1,4-bis (t-butylperoxyisopropyl) benzene, 1,1-di-t-butylperoxy-3,3-trimethylcyclohexane, 4,4-bis- (t-butyl-peroxy) -n-butylvale 2,5-dimethyl-2,5-di-t-butylperoxyhexane, 2,5-dimethyl-2,5-di-t-butylperoxyhexyne-3, 1,1-di-t-butyl Peroxy-3,5,5-trimethylcyclohexane, p-chlorobenzoyl peroxide, t-butyl
- the content of the crosslinking agent in the crosslinkable rubber composition of the present invention is preferably 0.1 to 100 parts by weight with respect to 100 parts by weight of the nitrile copolymer rubber (A) from the viewpoint of obtaining a good rubber cross-linked product.
- the amount is 10 parts by weight, more preferably 0.3 to 8 parts by weight, still more preferably 0.5 to 6 parts by weight.
- crosslinking aids such as activated zinc white, zinc white and stearic acid; guanidine type, aldehyde-amine type, aldehyde-ammonia type, thiazole type, sulfenamide type, thiourea type, etc.
- crosslinking accelerators can be used in combination.
- the amount of these crosslinking aids and crosslinking accelerators used is preferably in the range of 0.1 to 20 parts by weight with respect to 100 parts by weight of the nitrile copolymer rubber (A).
- a multifunctional monomer such as trimethylolpropane trimethacrylate, divinylbenzene, ethylene dimethacrylate, or triallyl isocyanurate can be used in combination as a crosslinking aid.
- the amount of these crosslinking aids used is preferably in the range of 0.5 to 20 parts by weight with respect to 100 parts by weight of the nitrile copolymer rubber (A).
- the crosslinkable rubber composition of the present invention preferably further contains an aromatic amine-based antiaging agent and / or a quinoline-based antiaging agent, and at least contains an aromatic amine-based antiaging agent. More preferably, it contains both an aromatic amine-based antioxidant and a quinoline-based antioxidant.
- an aromatic amine-based antioxidant and / or a quinoline-based antioxidant By further containing an aromatic amine-based antioxidant and / or a quinoline-based antioxidant, the resulting rubber cross-linked product can be made more excellent in ozone resistance.
- aromatic amine-based antioxidant examples include 4,4'-bis ( ⁇ , ⁇ '-dimethylbenzyl) diphenylamine (also referred to as "p.p'-dicumyldiphenylamine”), p.
- Diaryl secondary monoamine antioxidants such as octylated diphenylamine such as p'-dioctyldiphenylamine, styrenated diphenylamine and phenyl- ⁇ -naphthylamine; diphenyl-p-phenylenediamine, mixed diaryl-p-phenylenediamine, dinaphthyl-p
- Diaryl-p-phenylenediamine anti-aging agents such as phenylenediamine; N-isopropyl-N′-phenyl-p-phenylenediamine, N-1,3-dimethylbutyl-N′-phenyl-p-phenylenediamine, N Alkylaryl-p-phenyl
- alkylaryl-p-phenylenediamine anti-aging agents are preferable, and N-isopropyl-N′-phenyl-p-phenylenediamine is more preferable.
- quinoline antioxidant examples include 2,2,4-trimethyl-1,2-dihydroquinoline polymer and 6-ethoxy-2,2,4-trimethyl-1,2-dihydroquinoline polymer. These can be used individually by 1 type or in combination of multiple types. Of these, 2,2,4-trimethyl-1,2-dihydroquinoline polymer is preferred.
- the content of the aromatic amine-based antioxidant and / or the quinoline-based antioxidant in the crosslinkable rubber composition of the present invention is preferably 0.00 with respect to 100 parts by weight of the nitrile copolymer rubber (A).
- the amount is 3 to 15 parts by weight, more preferably 0.5 to 12 parts by weight, still more preferably 0.8 to 10 parts by weight.
- the crosslinkable rubber composition of the present invention preferably further contains a hydrocarbon wax.
- a hydrocarbon wax By further containing a hydrocarbon wax, the resulting rubber cross-linked product can be made more excellent in ozone resistance.
- hydrocarbon wax examples include polyolefin waxes such as polyethylene wax and polypropylene wax; Fischer-Tropsch wax; petroleum waxes such as paraffin wax and microstarin wax. Among these, Fischer-Tropsch wax and petroleum wax are preferable. Petroleum wax is more preferable.
- the content of the hydrocarbon wax in the crosslinkable rubber composition of the present invention is preferably 0.1 to 5 parts by weight, more preferably 0.1 parts by weight with respect to 100 parts by weight of the nitrile copolymer rubber (A).
- the amount is 3 to 4 parts by weight, more preferably 0.5 to 3 parts by weight.
- the crosslinkable rubber composition of the present invention preferably contains a plasticizer, and the same plasticizer as the above-mentioned nitrile copolymer rubber composition can be used.
- the content of the plasticizer in the crosslinkable rubber composition of the present invention is preferably 3 to 300 parts by weight, more preferably 5 to 200 parts by weight, with respect to 100 parts by weight of the nitrile copolymer rubber (A). Parts, more preferably 10 to 150 parts by weight.
- the content of the plasticizer in the crosslinkable rubber composition of the present invention is adjusted so that the total content of the plasticizer contained in the nitrile copolymer rubber composition of the present invention described above falls within the above range. That's fine.
- the crosslinkable rubber composition of the present invention has other compounding agents used for general rubber as necessary, for example, a crosslinking retarder, a reinforcing agent, a filler, a lubricant, an adhesive, a lubricant, a processing agent.
- a crosslinking retarder such as an adjuvant, a flame retardant, an antifungal agent, an antistatic agent, a coloring agent, and a coupling agent.
- a rubber other than the nitrile copolymer rubber (A) and the liquid nitrile rubber (C) may be blended with the crosslinkable rubber composition of the present invention as long as the effects of the present invention are not inhibited.
- rubbers other than nitrile copolymer rubber (A) and liquid nitrile rubber (C) acrylic rubber, ethylene-acrylic acid copolymer rubber, fluorine rubber, styrene-butadiene copolymer rubber, polybutadiene rubber, ethylene-propylene Examples include copolymer rubber, ethylene-propylene-diene terpolymer rubber, epichlorohydrin rubber, urethane rubber, chloroprene rubber, silicone rubber, fluorosilicone rubber, chlorosulfonated polyethylene rubber, natural rubber and polyisoprene rubber.
- the blending amount is 100 parts by weight in total of the nitrile copolymer rubber (A) and the liquid nitrile rubber (C). 30 parts by weight or less, more preferably 20 parts by weight or less, and particularly preferably 10 parts by weight or less.
- the method for preparing the cross-linkable rubber composition of the present invention is not particularly limited, but a nitrile copolymer rubber composition obtained by the above-described method is added with a cross-linking agent and other compounding agents, and rolls and Banbury. What is necessary is just to knead
- the blending order is not particularly limited, but components (such as a crosslinking agent and a crosslinking accelerator) that are easily decomposed by heat after sufficiently mixing components that are not easily reacted or decomposed by heat do not decompose. What is necessary is just to mix for a short time below temperature.
- cross-linked rubber The cross-linked rubber of the present invention is obtained by cross-linking the cross-linkable rubber composition of the present invention described above.
- the crosslinkable rubber composition When the crosslinkable rubber composition is crosslinked, it is molded by a molding machine corresponding to the shape of the molded product (rubber crosslinked product) to be produced, for example, an extruder, an injection molding machine, a compressor, a roll, etc., and then crosslinked. By reacting, the shape of the crosslinked product is fixed.
- the crosslinking may be performed after molding in advance, or the crosslinking may be performed simultaneously with the 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 24 hours, preferably 2 minutes to 1 hour.
- the rubber cross-linked product of the present invention thus obtained is obtained using the above-described nitrile rubber composition and cross-linkable rubber composition of the present invention, cold resistance, ozone resistance, oil resistance, and It has excellent compression set.
- the rubber cross-linked product of the present invention preferably has an embrittlement temperature of ⁇ 30 ° C. or lower, and can be made more excellent in cold resistance when the embrittlement temperature is ⁇ 30 ° C. or lower.
- the method for setting the brittle temperature of the crosslinked rubber to ⁇ 30 ° C. or lower is not particularly limited.
- the plasticizer described above is used as a plasticizer (preferably containing a dibasic acid and an ether bond).
- An ester compound with alcohol more preferably an ester compound of adipic acid and an ether bond-containing alcohol, more preferably di (butoxyethoxyethyl) adipic acid
- the method is preferably 3 to 100 parts by weight, more preferably 5 to 80 parts by weight, and still more preferably 10 to 60 parts by weight with respect to 100 parts by weight of the polymer rubber (A).
- the rubber cross-linked product of the present invention has a dynamic ozone property test in which the rubber cross-linked product is exposed to an atmosphere having an ozone concentration of 50 pphm and 40 ° C. under repeated elongation of 0 to 20% in accordance with JIS K6259.
- the time until cracking occurs in the rubber cross-linked product when performing is preferably 72 hours or longer and has excellent ozone resistance.
- the rubber cross-linked product of the present invention includes seal members such as packings, gaskets, O-rings and oil seals; hoses such as oil hoses, fuel hoses, inlet hoses, gas hoses, brake hoses, refrigerant hoses; diaphragms; As a gas hose for transporting air, nitrogen, oxygen, hydrogen, carbon dioxide, carbon monoxide, methane, ethane, propane, dimethyl ether, water vapor, etc. It is particularly preferably used, particularly as a hose or tube.
- Mooney viscosity (Polymer Mooney) The Mooney viscosity (polymer Mooney) of the nitrile copolymer rubber was measured according to JIS K6300 (unit: [ML1 + 4, 100 ° C.]).
- Embrittlement temperature (cold resistance)
- the crosslinkable rubber composition was placed in a mold having a length of 15 cm, a width of 15 cm, and a depth of 0.2 cm, and press-molded at 160 ° C. for 15 minutes while applying pressure to obtain a sheet-like rubber crosslinked product.
- the embrittlement temperature was measured according to JIS K6261. It can be judged that the lower the embrittlement temperature, the better the cold resistance.
- the compression set crosslinkable rubber composition was crosslinked by pressing it at a temperature of 160 ° C. for 20 minutes using a mold to obtain a cylindrical rubber crosslinked product having a diameter of 29 mm and a height of 12.5 mm. Then, using the obtained cylindrical rubber cross-linked product, in accordance with JIS K6262, the rubber cross-linked product was compressed for 25% in an environment of 100 ° C. for 70 hours, and then the compression set was measured. It can be determined that the smaller this value, the better the compression set.
- Production Example 1 (Production of nitrile copolymer rubber (A-1)) A reaction vessel was charged with 240 parts of water, 28 parts of acrylonitrile and 2.5 parts of sodium dodecylbenzenesulfonate (emulsifier), and the temperature was adjusted to 5 ° C.
- the first stage of the emulsion polymerization reaction was started by adding 0.006 part of ferrous iron (7-hydrate), 0.06 part of sodium formaldehyde sulfoxylate, and 1 part of t-dodecyl mercaptan as a chain transfer agent.
- nitrile copolymer rubber (A-1) As a result of measuring the composition of each monomer unit of the obtained nitrile copolymer rubber (A-1) by 1 H-NMR, 29.0% by weight of acrylonitrile units, 71.0% by weight of 1,3-butadiene units were obtained. %, And the polymer Mooney viscosity [ML1 + 4, 100 ° C.] was 78.
- Production Example 2 (Production of nitrile copolymer rubber (A-2))
- the monomer charged in the first stage of emulsion polymerization was changed to 33 parts of acrylonitrile and 67 parts of 1,3-butadiene, and the polymerization reaction was stopped when the polymerization conversion reached 90% by weight.
- a latex of nitrile copolymer rubber (A-2) (solid content concentration 27% by weight) was obtained in the same manner as in Production Example 1 except that
- nitrile copolymer rubber (A-2) As a result of measuring the composition of each monomer unit of the obtained nitrile copolymer rubber (A-2) by 1 H-NMR, 33.5% by weight of acrylonitrile units, 66.5% by weight of 1,3-butadiene units were measured. %, And the polymer Mooney viscosity [ML1 + 4, 100 ° C.] was 78.
- Production Example 3 (Production of nitrile copolymer rubber (A-3))
- the monomer charged for the first stage of emulsion polymerization was changed to 37 parts of acrylonitrile and 63 parts of 1,3-butadiene, and the polymerization reaction was stopped when the polymerization conversion reached 90% by weight.
- a latex of nitrile copolymer rubber (A-3) (solid content concentration 27% by weight) was obtained in the same manner as in Production Example 1 except that
- nitrile copolymer rubber (A-3) As a result of measuring the composition of each monomer unit of the obtained nitrile copolymer rubber (A-3) by 1 H-NMR, it was found that the acrylonitrile unit was 40.5% by weight and the 1,3-butadiene unit was 59.5% by weight. %, And the polymer Mooney viscosity [ML1 + 4, 100 ° C.] was 80.
- Production Example 4 (Production of nitrile copolymer rubber (A-4))
- the monomer charged in the first stage of emulsion polymerization was changed to 40 parts of acrylonitrile and 60 parts of 1,3-butadiene, and the polymerization reaction was stopped when the polymerization conversion reached 90% by weight.
- a latex of nitrile copolymer rubber (A-4) (solid content concentration 27% by weight) was obtained in the same manner as in Production Example 1 except that
- nitrile copolymer rubber (A-4) As a result of measuring the composition of each monomer unit of the obtained nitrile copolymer rubber (A-4) by 1 H-NMR, 42.5% by weight of acrylonitrile units and 57.5% by weight of 1,3-butadiene units were measured. %, And the polymer Mooney viscosity [ML1 + 4, 100 ° C.] was 83.
- Production Example 5 (Production of nitrile copolymer rubber (A′-5))
- the monomer charged for the first stage of the emulsion polymerization was changed to 10 parts of acrylonitrile and 90 parts of 1,3-butadiene, and when the polymerization conversion reached 30% by weight and 50% by weight
- 5 parts and 5 parts of acrylonitrile were respectively added to the reaction vessel to perform the second and third stage polymerization reactions, and the polymerization reaction was stopped when the polymerization conversion reached 80% by weight.
- a latex of nitrile copolymer rubber (A′-5) solid content concentration: 26% by weight
- nitrile copolymer rubber (A′-5) was vacuum dried at 60 ° C. for 12 hours to obtain a nitrile copolymer rubber (A′-5).
- the composition of each monomer unit of the obtained nitrile copolymer rubber (A′-5) was measured by 1 H-NMR. As a result, 18.0% by weight of acrylonitrile units, 8% of 1,3-butadiene units were obtained.
- the polymer Mooney viscosity [ML1 + 4, 100 ° C.] was 78.
- Production Example 6 (Production of nitrile copolymer rubber (A'-6))
- the monomer charged in the first stage of emulsion polymerization was changed to 48 parts of acrylonitrile and 52 parts of 1,3-butadiene, and the polymerization reaction was stopped when the polymerization conversion reached 90% by weight.
- a latex of nitrile copolymer rubber (A′-6) (solid content concentration: 27% by weight) was obtained in the same manner as in Production Example 1 except that
- nitrile copolymer rubber (A′-6) As a result of measuring the composition of each monomer unit of the obtained nitrile copolymer rubber (A′-6) by 1 H-NMR, 50.0% by weight of acrylonitrile units, 50.0% of 1,3-butadiene units were obtained.
- the polymer Mooney viscosity [ML1 + 4, 100 ° C.] was 78.
- Production Example 7 (Production of liquid nitrile rubber (C-1))
- a reaction vessel 240 parts of water, 33 parts of acrylonitrile, 67 parts of 1,3-butadiene, 3 parts of sodium dodecyl sulfate, 0.5 part of potassium persulfate and 8 parts of t-dodecyl mercaptan as a molecular weight regulator are added.
- the mixture was maintained at 30 ° C. with sufficient stirring so as to be uniform, and when the polymerization conversion rate with respect to all the charged monomers reached 90% by weight, 0.1 part of hydroxylamine sulfate and 0.1 part of sodium hydroxide Was added to stop the polymerization reaction, and the residual monomer was heated and removed.
- the number average molecular weight of the obtained polymer (liquid nitrile rubber (C-1)) was 5000, and the acrylonitrile unit was 29.5% by weight.
- Example 1 To 82 parts of the nitrile copolymer rubber (A-1) obtained in Production Example 1, 82 parts of vinyl chloride resin (B-1) (average degree of polymerization 1700), liquid nitrile rubber (C) obtained in Production Example 7 -1) 20 parts and 33 parts of di (butoxyethoxyethyl) adipate (plasticizer) were added and kneaded at 175 ° C. with a Banbury mixer to obtain a nitrile copolymer rubber composition.
- nitrile copolymer rubber composition obtained above was added to acrylonitrile butadiene rubber (acrylonitrile unit 33.5 wt%, polymer Mooney viscosity [ML1 + 4, 100 ° C.] 27, nitrile copolymer rubber (A)) 18.
- MAF carbon 170 parts zinc oxide (active zinc white) 5.5 parts, a mixture of solid paraffin and microstalline wax 1.8 parts, 2,2,4-trimethyl-1,2-dihydroquinoline polymer ( Quinoline anti-aging agent) 3.7 parts, N-isopropyl-N′-phenyl-p-phenylenediamine (aromatic amine anti-aging agent) 3.7 parts, di (butoxyethoxyethyl) adipate (plasticizer) 71 parts were added, and it knead
- the resulting rubber composition was then wound on a roll heated to 50 ° C., 2.7 parts of 325 mesh sulfur, 2.7 parts of di-2-benzothiazolyl disulfide (crosslinking accelerator), and tetramethylthiuram 0.9 parts of disulfide (crosslinking accelerator) was added and kneaded with a roll to obtain a crosslinkable rubber composition.
- Example 2 Example 82, except that 82 parts of the nitrile copolymer rubber (A-2) obtained in Production Example 2 was used instead of 82 parts of the nitrile copolymer rubber (A-1) obtained in Production Example 1.
- a nitrile copolymer rubber composition and a crosslinkable rubber composition were obtained and evaluated in the same manner. The results are shown in Table 1.
- Example 3 Example 82, except that 82 parts of the nitrile copolymer rubber (A-3) obtained in Production Example 3 was used instead of 82 parts of the nitrile copolymer rubber (A-1) obtained in Production Example 1.
- a nitrile copolymer rubber composition and a crosslinkable rubber composition were obtained and evaluated in the same manner. The results are shown in Table 1.
- the acrylonitrile unit amount (as a mixture of the nitrile copolymer rubber (A-3) and the acrylonitrile butadiene rubber) as a whole nitrile copolymer rubber used in this example was 39.2% by weight.
- Example 4 The amount of nitrile copolymer rubber (A-2) obtained in Production Example 2 was 78 parts, the amount of vinyl chloride resin (B-1) was 117 parts, and the liquid nitrile rubber (C-1) A nitrile copolymer rubber composition was obtained in the same manner as in Example 2 except that the amount was changed to 24 parts and the amount of di (butoxyethoxyethyl) adipate was changed to 39 parts.
- the blending amount of acrylonitrile butadiene rubber (nitrile copolymer rubber (A)) to the nitrile copolymer rubber composition obtained above is 22 parts, and the blending amount of di (butoxyethoxyethyl) adipate is A crosslinkable rubber composition was obtained in the same manner as in Example 2 except that the amount was changed to 85 parts and the blending amount of MAF carbon to 200 parts, respectively, and evaluated in the same manner. The results are shown in Table 1.
- Example 5 Nitrile copolymer rubber composition as in Example 2, except that 82 parts of vinyl chloride resin (B-2) (average polymerization degree 2000) was used instead of 82 parts of vinyl chloride resin (B-1) And a crosslinkable rubber composition were obtained and evaluated in the same manner. The results are shown in Table 1.
- Example 6 Example 82, except that 82 parts of the nitrile copolymer rubber (A-4) obtained in Production Example 4 was used instead of 82 parts of the nitrile copolymer rubber (A-1) obtained in Production Example 1.
- a nitrile copolymer rubber composition and a crosslinkable rubber composition were obtained and evaluated in the same manner. The results are shown in Table 1.
- Example 7 A nitrile copolymer rubber composition was obtained in the same manner as in Example 4 except that 117 parts of vinyl chloride resin (B-3) (average polymerization degree 1300) was used instead of 117 parts of vinyl chloride resin (B-1). And a crosslinkable rubber composition were obtained and evaluated in the same manner. The results are shown in Table 1.
- Example 8 The blending amount of the nitrile copolymer rubber (A-1) obtained in Production Example 1 was changed to 41 parts, and 41 parts of the nitrile copolymer rubber (A′-5) obtained in Production Example 5 was further added.
- the nitrile was used in the same manner as in Example 1 except that 75 parts of vinyl chloride resin (B-3) (average polymerization degree 1300) was used instead of 82 parts of vinyl chloride resin (B-1).
- a copolymer rubber composition and a crosslinkable rubber composition were obtained and evaluated in the same manner. The results are shown in Table 1.
- the nitrile copolymer unit (as a mixture of the nitrile copolymer rubber (A-1), the nitrile copolymer rubber (A′-5) and the acrylonitrile butadiene rubber) as a whole used in this example.
- the amount was 25.3% by weight.
- Example 9 A nitrile copolymer rubber composition was prepared in the same manner as in Example 6 except that 82 parts of vinyl chloride resin (B-2) (average polymerization degree 2000) was used instead of 82 parts of vinyl chloride resin (B-1). And a crosslinkable rubber composition were obtained and evaluated in the same manner. The results are shown in Table 1.
- Example 10 Instead of 78 parts of the nitrile copolymer rubber (A-2) obtained in Production Example 2, 41 parts of the nitrile copolymer rubber (A-4) obtained in Production Example 4 and obtained in Production Example 6 Using 41 parts of nitrile copolymer rubber (A'-6), the amount of liquid nitrile rubber (C-1) is 20 parts, the amount of vinyl chloride resin (B-3) is 82 parts, A nitrile copolymer rubber composition and a crosslinkable rubber composition are obtained in the same manner as in Example 7 except that the amount of acrylonitrile butadiene rubber (nitrile copolymer rubber (A)) is changed to 18 parts. The same evaluation was performed. The results are shown in Table 1.
- the nitrile copolymer unit (as a mixture of the nitrile copolymer rubber (A-4), the nitrile copolymer rubber (A′-6) and the acrylonitrile butadiene rubber) as the whole nitrile copolymer rubber used in this example.
- the amount was 44.0% by weight.
- Comparative Example 1 The procedure was carried out except that 82 parts of the nitrile copolymer rubber (A′-5) obtained in Production Example 5 was used instead of 82 parts of the nitrile copolymer rubber (A-1) obtained in Production Example 1.
- a nitrile copolymer rubber composition and a crosslinkable rubber composition were obtained and evaluated in the same manner. The results are shown in Table 2.
- the total amount of acrylonitrile units (as a mixture of nitrile copolymer rubber (A′-5) and acrylonitrile butadiene rubber) as a whole nitrile copolymer rubber used in this example was 20.8% by weight.
- Comparative Example 2 The procedure was carried out except that 82 parts of the nitrile copolymer rubber (A′-6) obtained in Production Example 6 was used instead of 82 parts of the nitrile copolymer rubber (A-1) obtained in Production Example 1.
- a nitrile copolymer rubber composition and a crosslinkable rubber composition were obtained and evaluated in the same manner. The results are shown in Table 2.
- the total amount of acrylonitrile units (as a mixture of nitrile copolymer rubber (A′-6) and acrylonitrile butadiene rubber) as a whole nitrile copolymer rubber used in this example was 47.0% by weight.
- Comparative Example 3 The blending amount of the vinyl chloride resin (B-1) is changed from 82 parts to 55 parts, the blending amount of the liquid nitrile rubber (C-1) obtained in Production Example 7 is changed from 20 parts to 17 parts, and di (butoxy adipate) is added. A nitrile copolymer rubber composition and a crosslinkable rubber composition were obtained in the same manner as in Example 2 except that the compounding amount of ethoxyethyl) was changed from 33 parts to 27.0 parts. Went. The results are shown in Table 2.
- Comparative Example 4 The amount of the vinyl chloride resin (B-1) was changed from 82 parts to 190 parts, and the amount of di (butoxyethoxyethyl) adipate was changed from 33 parts to 55 parts.
- a nitrile copolymer rubber composition was prepared in the same manner as in Example 2 except that the blending amount of the liquid nitrile rubber (C-1) was not blended.
- a vinyl chloride resin Due to the increase in the blending amount of B-1), the polymer Mooney viscosity of the mixture is increased and the processability is greatly reduced, and the nitrile copolymer rubber (A-2) and the vinyl chloride resin (B-1) It became difficult to mix with and a good composition could not be obtained.
- Comparative Example 6 A nitrile copolymer rubber composition was prepared in the same manner as in Example 2 except that 82 parts of vinyl chloride resin (B-5) (average polymerization degree 2500) was used instead of 82 parts of vinyl chloride resin (B-1).
- B-5 average polymerization degree 2500
- Comparative Example 6 the average degree of polymerization of the vinyl chloride resin (B-5) was too high, so that the polymer Mooney viscosity of the mixture was increased, the processability was greatly reduced, and the nitrile copolymer rubber was reduced. Mixing of (A-2) and the vinyl chloride resin (B-5) was difficult, and a good composition could not be obtained.
- “product ( ⁇ ⁇ ⁇ )” is the product ( ⁇ ⁇ ⁇ ) of the average polymerization degree ⁇ of the vinyl chloride resin (B) and the content ratio ⁇ of the vinyl chloride resin (B).
- “Ratio (( ⁇ ⁇ ⁇ ) / ⁇ )” is the ratio of the product ( ⁇ ⁇ ⁇ ) to the content ratio ⁇ of the ⁇ , ⁇ -ethylenically unsaturated nitrile monomer unit (( ⁇ ⁇ ⁇ ) / ⁇ ).
- the average degree of polymerization is 1200.
- a rubber cross-linked product obtained by using a composition formed by blending 70 to 140 parts by weight of vinyl chloride resin (B) of 2 to 2200 has a low embrittlement temperature, excellent cold resistance, and a dynamic ozone resistance test. The crack generation time was long, the ozone resistance was excellent, and the oil resistance and compression set resistance were also excellent (Examples 1 to 10).
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Abstract
Description
本発明のニトリル共重合体ゴム組成物においては、前記塩化ビニル樹脂(B)の平均重合度をα、前記ニトリル共重合体ゴム(A)100重量部に対する、前記塩化ビニル樹脂(B)の含有割合をβ重量部とした場合に、前記塩化ビニル樹脂(B)の平均重合度αと、前記塩化ビニル樹脂(B)の含有割合βとの積(α×β)が、100,000以上であり、前記ニトリル共重合体ゴム(A)中の前記α,β-エチレン性不飽和ニトリル単量体単位の含有割合をγ重量%とした場合に、前記積(α×β)と、前記α,β-エチレン性不飽和ニトリル単量体単位の含有割合γとの比((α×β)/γ)が3,000~6,000であることが好ましい。
本発明のニトリル共重合体ゴム組成物は、液状ニトリルゴム(C)をさらに含有するものであることが好ましい。
本発明のニトリル共重合体ゴム組成物において、前記液状ニトリルゴム(C)の含有割合が、前記ニトリル共重合体ゴム(A)100重量部に対して、5~50重量部であることが好ましい。
本発明のニトリル共重合体ゴム組成物は、可塑剤をさらに含有することが好ましく、前記可塑剤が、二塩基酸と、エーテル結合含有アルコールとのエステル化合物であることが好ましい。
さらに、本発明によれば、上記架橋性ゴム組成物を架橋してなるゴム架橋物が提供される。本発明のゴム架橋物は、脆化温度が-30℃以下であることが好ましい。
本発明のニトリル共重合体ゴム組成物は、α,β-エチレン性不飽和ニトリル単量体単位22~45重量%を含有するニトリル共重合体ゴム(A)と、平均重合度が1200~2200である塩化ビニル樹脂(B)とを含有し、前記ニトリル共重合体ゴム(A)100重量部に対する、前記塩化ビニル樹脂(B)の含有割合が70~140重量部である、ニトリル共重合体ゴムの組成物である。
本発明で用いるニトリル共重合体ゴム(A)は、少なくともα,β-エチレン性不飽和ニトリル単量体単位を22~45重量%の割合で含有するゴムであり、25℃において固体状態を有する(25℃において流動性を有しない)ものである。
本発明のニトリル共重合体ゴム組成物は、上述したニトリル共重合体ゴム(A)に加えて、平均重合度が1200~2200である塩化ビニル樹脂(B)を含有する。
また、本発明のニトリル共重合体ゴム組成物は、上述したニトリル共重合体ゴム(A)および塩化ビニル樹脂(B)に加えて、液状ニトリルゴム(C)を含有するものであることが好ましい。液状ニトリルゴム(C)を含有するものとすることにより、得られるゴム架橋物の耐オゾン性をより向上させることができる。
本発明で用いる液状ニトリルゴム(C)は、25℃において液体状態を有する(25℃において流動性を有する)ニトリル共重合体ゴムである。本発明で用いる液状ニトリルゴム(C)は、たとえば、JIS K6300に準拠して測定されるムーニー粘度が、通常、1以下、あるいは、粘度が低すぎてムーニー粘度が測定不可能なものである。
共役ジエン単量体としては、上述したニトリル共重合体ゴム(A)と同様のものを用いることができ、1,3-ブタジエンが好ましい。
また、共重合可能な他の単量体としては、上述したニトリル共重合体ゴム(A)と同様のものを用いることができる。
また、液状ニトリルゴム(C)中における、共役ジエン単量体単位の含有割合は、全単量体単位中、好ましくは40~90重量%、より好ましくは50~80重量%であり、さらに好ましくは60~75重量%である。
さらに、液状ニトリルゴム(C)中における共重合可能な他の単量体の含有割合は、全単量体単位中、好ましくは30重量%以下、より好ましくは20重量%以下、特に好ましくは10重量%以下である。
また、本発明のニトリル共重合体ゴム組成物は、上述したニトリル共重合体ゴム(A)および塩化ビニル樹脂(B)、ならびに、必要に応じて用いられる液状ニトリルゴム(C)に加えて、その他の配合剤を含有していてもよい。このようなその他の配合剤としては、たとえば、可塑剤、老化防止剤、および安定剤などが挙げられる。
本発明の架橋性ゴム組成物は、上述した本発明のニトリル共重合体ゴム組成物に、架橋剤を配合してなるものである。架橋剤としては、硫黄系架橋剤、有機過酸化物架橋剤等が挙げられる。これらは一種単独でまたは複数種併せて用いることができるが、硫黄系架橋剤を用いることが好ましい。
なお、この場合における、配合順序は特に限定されないが、熱で反応や分解しにくい成分を充分に混合した後、熱で分解しやすい成分(架橋剤、架橋促進剤など)を、分解が起こらない温度以下で短時間混合すればよい。
本発明のゴム架橋物は、上述した本発明の架橋性ゴム組成物を架橋してなるものである。
架橋性ゴム組成物を架橋する際には、製造する成形品(ゴム架橋物)の形状に対応した成形機、たとえば、押出機、射出成形機、圧縮機、ロールなどにより成形を行い、次いで架橋反応させることにより架橋物の形状を固定化する。架橋を行う際には、予め成形した後に架橋してもよいし、成形と同時に架橋を行ってもよい。成形温度は、通常、10~200℃、好ましくは25~120℃である。架橋温度は、通常、100~200℃、好ましくは130~190℃であり、架橋時間は、通常、1分~24時間、好ましくは2分~1時間である。
ニトリル共重合体ゴムのムーニー粘度(ポリマー・ムーニー)は、JIS K6300に従って測定した(単位は〔ML1+4、100℃〕)。
架橋性ゴム組成物を縦15cm、横15cm、深さ0.2cmの金型に入れ、加圧しながら160℃で15分間プレス成形してシート状のゴム架橋物を得た。得られたシート状のゴム架橋物を用い、JIS K6261に従い、脆化温度を測定した。脆化温度が低いほど耐寒性に優れると判断できる。
上記脆化温度の測定に用いたシート状のゴム架橋物と同様のものを用い、JIS K6259に準じて、試験片を0~20%の繰り返し伸長下に、オゾン濃度50pphm、40℃の雰囲気に曝し、経過時間に伴う試験片のクラック発生状態を観察した。なお、クラック発生の有無の確認は24時間ごとに行い、最後にクラックの発生が確認できなかった時の経過時間を、クラック発生時の時間とした(たとえば、48時間後にはクラックの発生が確認できなかった一方で、72時間後にはクラックが発生した場合には、クラック発生時の時間は、48時間とした。)。クラック発生までの時間が長いほど、耐オゾン性に優れると判断できる。
上記脆化温度の測定に用いたシート状のゴム架橋物と同様のものを用い、JIS K6258に従い、該ゴム架橋物を、温度40℃、72時間の条件で、イソオクタン/トルエン=50/50(体積比)の試験燃料油(Fuel-C)中に浸漬することにより耐油性試験を行った。そして、試験燃料油に浸漬前後のゴム架橋物の体積を測定し、浸漬後の体積変化率△V(単位:%)を「体積変化率△V=([浸漬後の体積-浸漬前の体積]/浸漬前の体積)×100」にしたがって算出することで、耐油性の評価を行った。体積変化率△Vの絶対値が小さいほど、燃料油による膨潤の度合いが小さく、耐油性に優れると判断できる。
架橋性ゴム組成物を、金型を用いて、温度160℃で20分間プレスすることにより架橋し、直径29mm、高さ12.5mmの円柱型のゴム架橋物を得た。そして、得られた円柱型のゴム架橋物を用いて、JIS K6262に従い、ゴム架橋物を25%圧縮させた状態で、100℃の環境下に70時間置いた後、圧縮永久歪みを測定した。この値が小さいほど、圧縮永久歪み性に優れると判断できる。
反応容器に、水240部、アクリロニトリル28部およびドデシルベンゼンスルホン酸ナトリウム(乳化剤)2.5部を仕込み、温度を5℃に調整した。次いで、気相を減圧して十分に脱気してから、1,3-ブタジエン72部、重合開始剤であるp-メンタンヒドロペルオキシド0.04部、エチレンジアミン四酢酸ナトリウム0.02部、硫酸第一鉄(7水塩)0.006部およびホルムアルデヒドスルホキシル酸ナトリウム0.06部、ならびに連鎖移動剤であるt-ドデシルメルカプタン1部を添加して乳化重合の1段目の反応を開始した。その後、仕込み全単量体に対する重合転化率が88重量%に達した時点でヒドロキシルアミン硫酸塩0.3部、および水酸化カリウム0.2部を添加して重合反応を停止させた。反応停止後、反応容器の内容物を70℃に加温し、減圧下に水蒸気蒸留により未反応の単量体を回収してニトリル共重合体ゴム(A-1)のラテックス(固形分26重量%)を得た。
製造例1において、乳化重合1段目の反応の仕込み単量体を、アクリロニトリル33部、1,3-ブタジエン67部に変更し、重合転化率が90重量%に達した時点で重合反応を停止させた以外は製造例1と同様にしてニトリル共重合体ゴム(A-2)のラテックス(固形分濃度27重量%)を得た。
製造例1において、乳化重合1段目の反応の仕込み単量体を、アクリロニトリル37部、1,3-ブタジエン63部に変更し、重合転化率が90重量%に達した時点で重合反応を停止させた以外は製造例1と同様にしてニトリル共重合体ゴム(A-3)のラテックス(固形分濃度27重量%)を得た。
製造例1において、乳化重合1段目の反応の仕込み単量体を、アクリロニトリル40部、1,3-ブタジエン60部に変更し、重合転化率が90重量%に達した時点で重合反応を停止させた以外は製造例1と同様にしてニトリル共重合体ゴム(A-4)のラテックス(固形分濃度27重量%)を得た。
製造例1において、乳化重合1段目の反応の仕込み単量体を、アクリロニトリル10部、1,3-ブタジエン90部に変更し、重合転化率が30重量%、および50重量%に達した時点で、反応容器にアクリロニトリルをそれぞれ5部、および5部追加添加して2段目および3段目の重合反応を行い、重合転化率が80重量%に達した時点で重合反応を停止させた以外は製造例1と同様にしてニトリル共重合体ゴム(A’-5)のラテックス(固形分濃度26重量%)を得た。
製造例1において、乳化重合1段目の反応の仕込み単量体を、アクリロニトリル48部、1,3-ブタジエン52部に変更し、重合転化率が90重量%に達した時点で重合反応を停止させた以外は製造例1と同様にしてニトリル共重合体ゴム(A’-6)のラテックス(固形分濃度27重量%)を得た。
反応容器に、水240部、アクリロニトリル33部、1,3-ブタジエン67、ドデシル硫酸ナトリウム3部、過硫酸カリウム0.5部を入れ、さらに分子量調整剤であるt-ドデシルメルカプタン8部を加えて均一になるように十分撹拌しながら30℃に維持し、仕込み全単量体に対する重合転化率が90重量%に達した時点でヒドロキシルアミン硫酸塩0.1部、および水酸化ナトリウム0.1部を添加して重合反応を停止させ、残留単量体を加熱・除去した。得られた重合体(液状ニトリルゴム(C-1))の数平均分子量は5000、アクリロニトリル単位29.5重量%であった。
製造例1で得られたニトリル共重合体ゴム(A-1)82部に、塩化ビニル樹脂(B-1)(平均重合度1700)82部、製造例7で得られた液状ニトリルゴム(C-1)20部、アジピン酸ジ(ブトキシエトキシエチル)(可塑剤)33部、を添加して、バンバリーミキサーにて、175℃で混練することにより、ニトリル共重合体ゴム組成物を得た。
製造例1で得られたニトリル共重合体ゴム(A-1)82部に代えて、製造例2で得られたニトリル共重合体ゴム(A-2)82部を使用した以外は、実施例1と同様にして、ニトリル共重合体ゴム組成物および架橋性ゴム組成物を得て、同様に評価を行った。結果を表1に示す。なお、本実施例で用いたニトリル共重合体ゴム全体としての(ニトリル共重合体ゴム(A-2)およびアクリロニトリルブタジエンゴムの混合物としての)アクリロニトリル単位量は33.5重量%であった(実施例4,5,7、比較例3~6においても同様。)。
製造例1で得られたニトリル共重合体ゴム(A-1)82部に代えて、製造例3で得られたニトリル共重合体ゴム(A-3)82部を使用した以外は、実施例1と同様にして、ニトリル共重合体ゴム組成物および架橋性ゴム組成物を得て、同様に評価を行った。結果を表1に示す。なお、本実施例で用いたニトリル共重合体ゴム全体としての(ニトリル共重合体ゴム(A-3)およびアクリロニトリルブタジエンゴムの混合物としての)アクリロニトリル単位量は39.2重量%であった。
製造例2で得られたニトリル共重合体ゴム(A-2)の配合量を78部に、塩化ビニル樹脂(B-1)の配合量を117部に、液状ニトリルゴム(C-1)の配合量を24部に、アジピン酸ジ(ブトキシエトキシエチル)の配合量を39部に、それぞれ変更した以外は、実施例2と同様にして、ニトリル共重合体ゴム組成物を得た。
塩化ビニル樹脂(B-1)82部に代えて、塩化ビニル樹脂(B-2)(平均重合度2000)82部を使用した以外は、実施例2と同様にして、ニトリル共重合体ゴム組成物および架橋性ゴム組成物を得て、同様に評価を行った。結果を表1に示す。
製造例1で得られたニトリル共重合体ゴム(A-1)82部に代えて、製造例4で得られたニトリル共重合体ゴム(A-4)82部を使用した以外は、実施例1と同様にして、ニトリル共重合体ゴム組成物および架橋性ゴム組成物を得て、同様に評価を行った。結果を表1に示す。なお、本実施例で用いたニトリル共重合体ゴム全体としての(ニトリル共重合体ゴム(A-4)およびアクリロニトリルブタジエンゴムの混合物としての)アクリロニトリル単位量は40.9重量%であった。
塩化ビニル樹脂(B-1)117部に代えて、塩化ビニル樹脂(B-3)(平均重合度1300)117部を使用した以外は、実施例4と同様にして、ニトリル共重合体ゴム組成物および架橋性ゴム組成物を得て、同様に評価を行った。結果を表1に示す。
製造例1で得られたニトリル共重合体ゴム(A-1)の配合量を41部に変更するとともに、製造例5で得られたニトリル共重合体ゴム(A’-5)41部をさらに使用し、かつ、塩化ビニル樹脂(B-1)82部に代えて、塩化ビニル樹脂(B-3)(平均重合度1300)75部を使用した以外は、実施例1と同様にして、ニトリル共重合体ゴム組成物および架橋性ゴム組成物を得て、同様に評価を行った。結果を表1に示す。なお、本実施例で用いたニトリル共重合体ゴム全体としての(ニトリル共重合体ゴム(A-1)、ニトリル共重合体ゴム(A’-5)およびアクリロニトリルブタジエンゴムの混合物としての)アクリロニトリル単位量は25.3重量%であった。
塩化ビニル樹脂(B-1)82部に代えて、塩化ビニル樹脂(B-2)(平均重合度2000)82部を使用した以外は、実施例6と同様にして、ニトリル共重合体ゴム組成物および架橋性ゴム組成物を得て、同様に評価を行った。結果を表1に示す。
製造例2で得られたニトリル共重合体ゴム(A-2)78部に代えて、製造例4で得られたニトリル共重合体ゴム(A-4)41部および製造例6で得られたニトリル共重合体ゴム(A’-6)41部を使用するとともに、液状ニトリルゴム(C-1)の配合量を20部に、塩化ビニル樹脂(B-3)の配合量を82部に、アクリロニトリルブタジエンゴム(ニトリル共重合体ゴム(A))の配合量を18部に、それぞれ変更した以外は、実施例7と同様にして、ニトリル共重合体ゴム組成物および架橋性ゴム組成物を得て、同様に評価を行った。結果を表1に示す。なお、本実施例で用いたニトリル共重合体ゴム全体としての(ニトリル共重合体ゴム(A-4)、ニトリル共重合体ゴム(A’-6)およびアクリロニトリルブタジエンゴムの混合物としての)アクリロニトリル単位量は44.0重量%であった。
製造例1で得られたニトリル共重合体ゴム(A-1)82部に代えて、製造例5で得られたニトリル共重合体ゴム(A’-5)82部を使用した以外は、実施例1と同様にして、ニトリル共重合体ゴム組成物および架橋性ゴム組成物を得て、同様に評価を行った。結果を表2に示す。なお、本実施例で用いたニトリル共重合体ゴム全体としての(ニトリル共重合体ゴム(A’-5)およびアクリロニトリルブタジエンゴムの混合物としての)アクリロニトリル単位量は20.8重量%であった。
製造例1で得られたニトリル共重合体ゴム(A-1)82部に代えて、製造例6で得られたニトリル共重合体ゴム(A’-6)82部を使用した以外は、実施例1と同様にして、ニトリル共重合体ゴム組成物および架橋性ゴム組成物を得て、同様に評価を行った。結果を表2に示す。なお、本実施例で用いたニトリル共重合体ゴム全体としての(ニトリル共重合体ゴム(A’-6)およびアクリロニトリルブタジエンゴムの混合物としての)アクリロニトリル単位量は47.0重量%であった。
塩化ビニル樹脂(B-1)の配合量を82部から55部に、製造例7で得られた液状ニトリルゴム(C-1)の配合量を20部から17部に、アジピン酸ジ(ブトキシエトキシエチル)の配合量を33部から27.0部に、それぞれ変更した以外は、実施例2と同様にして、ニトリル共重合体ゴム組成物および架橋性ゴム組成物を得て、同様に評価を行った。結果を表2に示す。
塩化ビニル樹脂(B-1)の配合量を82部から190部に、アジピン酸ジ(ブトキシエトキシエチル)の配合量を33部から55部に、それぞれ変更し、かつ、製造例7で得られた液状ニトリルゴム(C-1)の配合量を配合しなかった以外は、実施例2と同様にして、ニトリル共重合体ゴム組成物を調製したところ、比較例4においては、塩化ビニル樹脂(B-1)の配合量の増加に起因して、混合物のポリマームーニー粘度が高くなり、加工性が大きく低下し、ニトリル共重合体ゴム(A-2)と、塩化ビニル樹脂(B-1)との混合が困難となり、良好な組成物を得ることできなかった。
塩化ビニル樹脂(B-1)82部に代えて、塩化ビニル樹脂(B-4)(平均重合度1000)82部を使用した以外は、実施例2と同様にして、ニトリル共重合体ゴム組成物および架橋性ゴム組成物を得て、同様に評価を行った。結果を表2に示す。
塩化ビニル樹脂(B-1)82部に代えて、塩化ビニル樹脂(B-5)(平均重合度2500)82部を使用した以外は、実施例2と同様にして、ニトリル共重合体ゴム組成物を調製したところ、比較例6においては、塩化ビニル樹脂(B-5)の平均重合度が高すぎるため、混合物のポリマームーニー粘度が高くなり、加工性が大きく低下し、ニトリル共重合体ゴム(A-2)と、塩化ビニル樹脂(B-5)との混合が困難となり、良好な組成物を得ることできなかった。
また、α,β-エチレン性不飽和ニトリル単量体単位の含有割合が45重量%超であるニトリル共重合体ゴムを使用した場合には、得られるゴム架橋物は、耐寒性および耐オゾン性に劣るものであった(比較例2)。
また、塩化ビニル樹脂(B)の配合量が少なすぎる場合には、得られるゴム架橋物は、耐オゾン性に劣るものであった(比較例3)。
また、塩化ビニル樹脂の配合量が多すぎる場合や、平均重合度が2200超であるものを用いた場合には、加工性が大きく低下し、ニトリル共重合体ゴムと、塩化ビニル樹脂との混練が困難となり、良好な組成物を得ることができなかった(比較例4,6)。
さらに、塩化ビニル樹脂として、平均重合度が1200未満であるものを用いた場合には、得られるゴム架橋物は耐オゾン性に劣るものであった(比較例5)。
Claims (9)
- α,β-エチレン性不飽和ニトリル単量体単位22~45重量%を含有するニトリル共重合体ゴム(A)と、平均重合度が1200~2200である塩化ビニル樹脂(B)とを含有し、
前記ニトリル共重合体ゴム(A)100重量部に対する、前記塩化ビニル樹脂(B)の含有割合が70~140重量部であるニトリル共重合体ゴム組成物。 - 前記塩化ビニル樹脂(B)の平均重合度をα、前記ニトリル共重合体ゴム(A)100重量部に対する、前記塩化ビニル樹脂(B)の含有割合をβ重量部とした場合に、前記塩化ビニル樹脂(B)の平均重合度αと、前記塩化ビニル樹脂(B)の含有割合βとの積(α×β)が、100,000以上であり、
前記ニトリル共重合体ゴム(A)中の前記α,β-エチレン性不飽和ニトリル単量体単位の含有割合をγ重量%とした場合に、前記積(α×β)と、前記α,β-エチレン性不飽和ニトリル単量体単位の含有割合γとの比((α×β)/γ)が3,000~6,000である請求項1に記載のニトリル共重合体ゴム組成物。 - 液状ニトリルゴム(C)をさらに含有する請求項1または2に記載のニトリル共重合体ゴム組成物。
- 前記液状ニトリルゴム(C)の含有割合が、前記ニトリル共重合体ゴム(A)100重量部に対して、5~50重量部である請求項3に記載のニトリル共重合体ゴム組成物。
- 可塑剤をさらに含有する請求項1~4のいずれかに記載のニトリル共重合体ゴム組成物。
- 前記可塑剤が、二塩基酸と、エーテル結合含有アルコールとのエステル化合物である請求項5に記載のニトリル共重合体ゴム組成物。
- 請求項1~6のいずれかに記載のニトリル共重合体ゴム組成物に、架橋剤を配合してなる架橋性ゴム組成物。
- 請求項7に記載の架橋性ゴム組成物を架橋してなるゴム架橋物。
- 脆化温度が-30℃以下である請求項8に記載のゴム架橋物。
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US16/076,761 US10793704B2 (en) | 2016-02-23 | 2017-02-21 | Nitrile copolymer rubber composition, cross-link rubber composition, and cross-linked rubber |
MX2018009864A MX2018009864A (es) | 2016-02-23 | 2017-02-21 | Composicion de caucho de copolimero de nitrilo, composicion de caucho reticulable y caucho reticulado. |
CN201780011353.3A CN108699296A (zh) | 2016-02-23 | 2017-02-21 | 腈共聚物橡胶组合物、交联性橡胶组合物及橡胶交联物 |
EP17756484.6A EP3421531B1 (en) | 2016-02-23 | 2017-02-21 | Nitrile copolymer rubber composition, crosslinkable rubber composition and rubber crosslinked product |
JP2018501701A JP6852728B2 (ja) | 2016-02-23 | 2017-02-21 | ニトリル共重合体ゴム組成物、架橋性ゴム組成物およびゴム架橋物 |
BR112018016877A BR112018016877A2 (pt) | 2016-02-23 | 2017-02-21 | composições de borracha de copolímero de nitrila e de borracha reticulável, e, borracha reticulada. |
KR1020187024697A KR20180113543A (ko) | 2016-02-23 | 2017-02-21 | 니트릴 공중합체 고무 조성물, 가교성 고무 조성물 및 고무 가교물 |
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WO2019163482A1 (ja) * | 2018-02-26 | 2019-08-29 | 日本ゼオン株式会社 | ニトリル共重合体ゴム組成物、架橋性ゴム組成物、ゴム架橋物、及びホース |
WO2021241407A1 (ja) * | 2020-05-27 | 2021-12-02 | 日本ゼオン株式会社 | ディップ成形用ラテックス組成物およびディップ成形体 |
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CN111378214A (zh) * | 2020-04-26 | 2020-07-07 | 南京泰佳化工有限公司 | 一种丁腈橡胶专用烷基苯磺酸钠及其制备方法 |
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JPWO2017146046A1 (ja) | 2018-12-13 |
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JP6852728B2 (ja) | 2021-03-31 |
EP3421531A4 (en) | 2019-10-02 |
EP3421531A1 (en) | 2019-01-02 |
US20190040237A1 (en) | 2019-02-07 |
EP3421531B1 (en) | 2020-10-07 |
US10793704B2 (en) | 2020-10-06 |
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BR112018016877A2 (pt) | 2019-02-05 |
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