WO2011115093A1 - ホース用ニトリル共重合体ゴム組成物および架橋物 - Google Patents
ホース用ニトリル共重合体ゴム組成物および架橋物 Download PDFInfo
- Publication number
- WO2011115093A1 WO2011115093A1 PCT/JP2011/056010 JP2011056010W WO2011115093A1 WO 2011115093 A1 WO2011115093 A1 WO 2011115093A1 JP 2011056010 W JP2011056010 W JP 2011056010W WO 2011115093 A1 WO2011115093 A1 WO 2011115093A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- copolymer rubber
- nitrile copolymer
- hose
- weight
- rubber composition
- Prior art date
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- 239000005060 rubber Substances 0.000 title claims abstract description 285
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- 239000011243 crosslinked material Substances 0.000 title description 4
- 239000000178 monomer Substances 0.000 claims abstract description 146
- -1 glycol compound Chemical class 0.000 claims abstract description 95
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- 229910003475 inorganic filler Inorganic materials 0.000 claims abstract description 55
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- 239000007822 coupling agent Substances 0.000 claims abstract description 38
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- 238000004132 cross linking Methods 0.000 claims description 32
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- 239000003795 chemical substances by application Substances 0.000 claims description 11
- 125000004432 carbon atom Chemical group C* 0.000 claims description 9
- 238000000465 moulding Methods 0.000 claims description 8
- CREMABGTGYGIQB-UHFFFAOYSA-N carbon carbon Chemical compound C.C CREMABGTGYGIQB-UHFFFAOYSA-N 0.000 claims description 3
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- DQZNLOXENNXVAD-UHFFFAOYSA-N trimethoxy-[2-(7-oxabicyclo[4.1.0]heptan-4-yl)ethyl]silane Chemical compound C1C(CC[Si](OC)(OC)OC)CCC2OC21 DQZNLOXENNXVAD-UHFFFAOYSA-N 0.000 description 9
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- 239000001361 adipic acid Substances 0.000 description 7
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- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 7
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- 229910052901 montmorillonite Inorganic materials 0.000 description 7
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- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 6
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- 238000009826 distribution Methods 0.000 description 6
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- 229910052782 aluminium Inorganic materials 0.000 description 5
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- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 5
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- 238000010556 emulsion polymerization method Methods 0.000 description 5
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- 230000000704 physical effect Effects 0.000 description 5
- 229920002503 polyoxyethylene-polyoxypropylene Polymers 0.000 description 5
- 229910000275 saponite Inorganic materials 0.000 description 5
- 239000004094 surface-active agent Substances 0.000 description 5
- 125000001302 tertiary amino group Chemical group 0.000 description 5
- 238000005406 washing Methods 0.000 description 5
- MYRTYDVEIRVNKP-UHFFFAOYSA-N 1,2-Divinylbenzene Chemical compound C=CC1=CC=CC=C1C=C MYRTYDVEIRVNKP-UHFFFAOYSA-N 0.000 description 4
- KGIGUEBEKRSTEW-UHFFFAOYSA-N 2-vinylpyridine Chemical compound C=CC1=CC=CC=N1 KGIGUEBEKRSTEW-UHFFFAOYSA-N 0.000 description 4
- 239000005977 Ethylene Substances 0.000 description 4
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 4
- 239000006244 Medium Thermal Substances 0.000 description 4
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 4
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- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 4
- 150000001298 alcohols Chemical class 0.000 description 4
- SCABKEBYDRTODC-UHFFFAOYSA-N bis[2-(2-butoxyethoxy)ethyl] hexanedioate Chemical compound CCCCOCCOCCOC(=O)CCCCC(=O)OCCOCCOCCCC SCABKEBYDRTODC-UHFFFAOYSA-N 0.000 description 4
- 150000001735 carboxylic acids Chemical class 0.000 description 4
- IFDVQVHZEKPUSC-UHFFFAOYSA-N cyclohex-3-ene-1,2-dicarboxylic acid Chemical compound OC(=O)C1CCC=CC1C(O)=O IFDVQVHZEKPUSC-UHFFFAOYSA-N 0.000 description 4
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- 239000000463 material Substances 0.000 description 4
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- 239000011260 aqueous acid Substances 0.000 description 2
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- 239000001110 calcium chloride Substances 0.000 description 2
- 229910001628 calcium chloride Inorganic materials 0.000 description 2
- APEJMQOBVMLION-UHFFFAOYSA-N cinnamamide Chemical compound NC(=O)C=CC1=CC=CC=C1 APEJMQOBVMLION-UHFFFAOYSA-N 0.000 description 2
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- 235000019982 sodium hexametaphosphate Nutrition 0.000 description 1
- 229940067741 sodium octyl sulfate Drugs 0.000 description 1
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
- 229940048086 sodium pyrophosphate Drugs 0.000 description 1
- 235000019832 sodium triphosphate Nutrition 0.000 description 1
- RPACBEVZENYWOL-XFULWGLBSA-M sodium;(2r)-2-[6-(4-chlorophenoxy)hexyl]oxirane-2-carboxylate Chemical compound [Na+].C=1C=C(Cl)C=CC=1OCCCCCC[C@]1(C(=O)[O-])CO1 RPACBEVZENYWOL-XFULWGLBSA-M 0.000 description 1
- WFRKJMRGXGWHBM-UHFFFAOYSA-M sodium;octyl sulfate Chemical compound [Na+].CCCCCCCCOS([O-])(=O)=O WFRKJMRGXGWHBM-UHFFFAOYSA-M 0.000 description 1
- 239000000600 sorbitol Substances 0.000 description 1
- 239000003549 soybean oil Substances 0.000 description 1
- 235000012424 soybean oil Nutrition 0.000 description 1
- 125000005504 styryl group Chemical group 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- QAZLUNIWYYOJPC-UHFFFAOYSA-M sulfenamide Chemical compound [Cl-].COC1=C(C)C=[N+]2C3=NC4=CC=C(OC)C=C4N3SCC2=C1C QAZLUNIWYYOJPC-UHFFFAOYSA-M 0.000 description 1
- 125000004434 sulfur atom Chemical group 0.000 description 1
- FWMUJAIKEJWSSY-UHFFFAOYSA-N sulfur dichloride Chemical compound ClSCl FWMUJAIKEJWSSY-UHFFFAOYSA-N 0.000 description 1
- 229940052367 sulfur,colloidal Drugs 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 229910052714 tellurium Inorganic materials 0.000 description 1
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 235000019818 tetrasodium diphosphate Nutrition 0.000 description 1
- UEUXEKPTXMALOB-UHFFFAOYSA-J tetrasodium;2-[2-[bis(carboxylatomethyl)amino]ethyl-(carboxylatomethyl)amino]acetate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]C(=O)CN(CC([O-])=O)CCN(CC([O-])=O)CC([O-])=O UEUXEKPTXMALOB-UHFFFAOYSA-J 0.000 description 1
- 125000000101 thioether group Chemical group 0.000 description 1
- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 230000005068 transpiration Effects 0.000 description 1
- GQIUQDDJKHLHTB-UHFFFAOYSA-N trichloro(ethenyl)silane Chemical compound Cl[Si](Cl)(Cl)C=C GQIUQDDJKHLHTB-UHFFFAOYSA-N 0.000 description 1
- FRGPKMWIYVTFIQ-UHFFFAOYSA-N triethoxy(3-isocyanatopropyl)silane Chemical compound CCO[Si](OCC)(OCC)CCCN=C=O FRGPKMWIYVTFIQ-UHFFFAOYSA-N 0.000 description 1
- FBBATURSCRIBHN-UHFFFAOYSA-N triethoxy-[3-(3-triethoxysilylpropyldisulfanyl)propyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCSSCCC[Si](OCC)(OCC)OCC FBBATURSCRIBHN-UHFFFAOYSA-N 0.000 description 1
- VTHOKNTVYKTUPI-UHFFFAOYSA-N triethoxy-[3-(3-triethoxysilylpropyltetrasulfanyl)propyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCSSSSCCC[Si](OCC)(OCC)OCC VTHOKNTVYKTUPI-UHFFFAOYSA-N 0.000 description 1
- JRUIUSLJTAVCOL-UHFFFAOYSA-M triethyl(prop-2-enoyloxy)azanium;chloride Chemical compound [Cl-].CC[N+](CC)(CC)OC(=O)C=C JRUIUSLJTAVCOL-UHFFFAOYSA-M 0.000 description 1
- KNXVOGGZOFOROK-UHFFFAOYSA-N trimagnesium;dioxido(oxo)silane;hydroxy-oxido-oxosilane Chemical compound [Mg+2].[Mg+2].[Mg+2].O[Si]([O-])=O.O[Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O KNXVOGGZOFOROK-UHFFFAOYSA-N 0.000 description 1
- XYJRNCYWTVGEEG-UHFFFAOYSA-N trimethoxy(2-methylpropyl)silane Chemical compound CO[Si](OC)(OC)CC(C)C XYJRNCYWTVGEEG-UHFFFAOYSA-N 0.000 description 1
- JLGNHOJUQFHYEZ-UHFFFAOYSA-N trimethoxy(3,3,3-trifluoropropyl)silane Chemical compound CO[Si](OC)(OC)CCC(F)(F)F JLGNHOJUQFHYEZ-UHFFFAOYSA-N 0.000 description 1
- NEQZXUBZTZDVAF-UHFFFAOYSA-M trimethyl(2-methylprop-2-enoyloxy)azanium;chloride Chemical compound [Cl-].CC(=C)C(=O)O[N+](C)(C)C NEQZXUBZTZDVAF-UHFFFAOYSA-M 0.000 description 1
- OEIXGLMQZVLOQX-UHFFFAOYSA-N trimethyl-[3-(prop-2-enoylamino)propyl]azanium;chloride Chemical compound [Cl-].C[N+](C)(C)CCCNC(=O)C=C OEIXGLMQZVLOQX-UHFFFAOYSA-N 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
- 238000005292 vacuum distillation Methods 0.000 description 1
- 235000019354 vermiculite Nutrition 0.000 description 1
- KOZCZZVUFDCZGG-UHFFFAOYSA-N vinyl benzoate Chemical compound C=COC(=O)C1=CC=CC=C1 KOZCZZVUFDCZGG-UHFFFAOYSA-N 0.000 description 1
- 239000005050 vinyl trichlorosilane Substances 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B1/00—Layered products having a non-planar shape
- B32B1/08—Tubular products
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B25/00—Layered products comprising a layer of natural or synthetic rubber
- B32B25/14—Layered products comprising a layer of natural or synthetic rubber comprising synthetic rubber copolymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
- C08K3/013—Fillers, pigments or reinforcing additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/05—Alcohols; Metal alcoholates
- C08K5/053—Polyhydroxylic alcohols
-
- 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
- C08K5/06—Ethers; Acetals; Ketals; Ortho-esters
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/54—Silicon-containing compounds
- C08K5/548—Silicon-containing compounds containing sulfur
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
- C08L71/02—Polyalkylene oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2597/00—Tubular articles, e.g. hoses, pipes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/016—Additives defined by their aspect ratio
Definitions
- the present invention relates to a nitrile copolymer rubber composition for a hose that can provide a rubber cross-linked product for a hose excellent in gasoline permeation resistance, cold resistance, sour gasoline resistance and solvent crack resistance.
- a rubber (nitrile copolymer rubber) containing an ⁇ , ⁇ -ethylenically unsaturated nitrile monomer unit and a conjugated diene monomer unit or an olefin monomer unit is a rubber having excellent oil resistance.
- the cross-linked product is mainly used as a material for rubber products around various oils mainly for automobiles such as fuel hoses.
- the fuel hose is also required to be resistant to free radicals (sour gasoline resistance) generated in sour gasoline.
- sour gasoline resistance free radicals generated in sour gasoline.
- a fuel hose obtained by cross-linking a conventional nitrile copolymer rubber composition is inferior in gasoline permeation resistance and sour gasoline resistance, and therefore cannot meet these requirements.
- Patent Document 1 discloses ⁇ , ⁇ -ethylenically unsaturated as a nitrile copolymer rubber composition that gives a crosslinked product (hose) of nitrile copolymer rubber having excellent gasoline permeability and sour gasoline resistance. 10 to 75% by weight of nitrile monomer units, 5 to 89.9% by weight of conjugated diene monomer units, and 0.1 to 20 monomer units capable of forming cationic monomer units and / or cations A nitrile copolymer rubber composition containing a nitrile copolymer rubber having a weight percentage, an inorganic filler having an aspect ratio of 30 to 2,000, and a coupling agent has been proposed. According to Patent Document 1, although a crosslinked product (hose) of nitrile copolymer rubber having excellent gasoline permeation resistance and sour gasoline resistance can be obtained, further improvement in solvent crack resistance has been desired. .
- the present invention is made in view of such a situation, and a nitrile copolymer rubber for a hose that can provide a rubber cross-linked product for a hose excellent in gasoline permeation resistance, cold resistance, sour gasoline resistance and solvent crack resistance.
- An object is to provide a composition.
- the present inventor has found that a predetermined amount of nitrile copolymer rubber having an ⁇ , ⁇ -ethylenically unsaturated nitrile monomer unit is filled with an inorganic filler having a predetermined aspect ratio. It has been found that the above object can be achieved by a nitrile copolymer rubber composition obtained by adding an agent, a predetermined amount of a coupling agent, and a predetermined amount of a glycol compound, and the present invention has been completed.
- the nitrile copolymer rubber (A) having 20 to 80% by weight of ⁇ , ⁇ -ethylenically unsaturated nitrile monomer unit and the inorganic filler having an aspect ratio of 30 to 2,000 Containing the agent (B), the coupling agent (C) and the glycol compound (D), and the ratio of the coupling agent (C) to 100 parts by weight of the nitrile copolymer rubber (A) is 0.00.
- a nitrile copolymer rubber composition for a hose having a content of 05 to 15 parts by weight and a ratio of the glycol compound (D) of 0.05 to 15 parts by weight.
- the said glycol compound (D) is represented by following General formula (1). (In the general formula (1), n is 1 to 3000.)
- the glycol compound (D) is at least one selected from ethylene glycol, diethylene glycol, and polyethylene glycol having 8 or more carbon atoms.
- the nitrile copolymer rubber (A) further has a cationic monomer unit and / or a monomer unit capable of forming a cation, and in the nitrile copolymer rubber (A), The content ratio of the cationic monomer unit and / or the monomer unit capable of forming a cation is 0.1 to 30% by weight.
- the nitrile copolymer rubber composition for hoses of the present invention further contains a plasticizer.
- the nitrile copolymer rubber (A) is a hydrogenated nitrile copolymer rubber in which at least a part of the carbon-carbon unsaturated bond portion is hydrogenated.
- the nitrile copolymer rubber composition for hose of the present invention further contains 10 to 150 parts by weight of vinyl chloride resin and / or acrylic resin with respect to 100 parts by weight of the nitrile copolymer rubber (A). To do.
- the crosslinkable nitrile copolymer rubber composition for hoses which contains the said nitrile copolymer rubber composition for hoses and a crosslinking agent is provided.
- a rubber cross-linked product for a hose obtained by cross-linking the above cross-linkable nitrile copolymer rubber composition for a hose.
- the laminated body for hoses which consists of two or more layers and in which at least 1 layer is comprised from the said rubber crosslinked material for hoses is provided.
- molding the said crosslinkable nitrile copolymer rubber composition for hoses in a cylinder shape, and inserting a mandrel is provided.
- the hose of the present invention is preferably a molded body obtained by molding a laminate of two or more layers including a layer made of the crosslinkable nitrile copolymer rubber composition for a hose into a cylinder and inserting a mandrel, It is obtained by crosslinking.
- a nitrile copolymer rubber composition for a hose which gives a rubber cross-linked product for a hose excellent in gasoline permeation resistance, cold resistance, sour gasoline resistance and solvent crack resistance, and the composition is crosslinked.
- a rubber cross-linked product for a hose having the above-mentioned characteristics is obtained.
- Nitrile copolymer rubber composition for hose of the present invention comprises a nitrile copolymer rubber having 20 to 80% by weight of ⁇ , ⁇ -ethylenically unsaturated nitrile monomer unit (A ), An inorganic filler (B) having an aspect ratio of 30 to 2,000, a coupling agent (C), and a glycol compound (D), and the nitrile copolymer rubber (A) 100 A composition of a nitrile copolymer rubber in which the ratio of the coupling agent (C) to 0.05 parts by weight and the ratio of the glycol compound (D) to 0.05 parts by weight is 0.05 to 15 parts by weight. .
- the nitrile copolymer rubber (A) used in the present invention will be described.
- the nitrile copolymer rubber (A) is a rubber having at least 20 to 80% by weight of an ⁇ , ⁇ -ethylenically unsaturated nitrile monomer unit.
- the content of the ⁇ , ⁇ -ethylenically unsaturated nitrile monomer unit is 20 to 80% by weight, preferably 30 to 70% by weight, particularly preferably 40 to 65% by weight based on the total monomer units. %. If the content ratio of the ⁇ , ⁇ -ethylenically unsaturated nitrile monomer unit is too low, the gasoline permeation resistance and oil resistance of the resulting rubber cross-linked product for hose deteriorate. On the other hand, if the content ratio is too high, the obtained rubber cross-linked product for hose is inferior in cold resistance, and the embrittlement temperature becomes high.
- 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 is a monomer capable of forming a cationic monomer unit and / or a cation in addition to the ⁇ , ⁇ -ethylenically unsaturated nitrile monomer unit. It is preferable to further have a unit.
- the content of the cationic monomer unit and / or the monomer unit capable of forming a cation is 0 to 30% by weight, preferably 0.1 to 30% by weight, based on the total monomer units. More preferably, it is 0.3 to 10% by weight.
- a monomer that forms a cationic monomer unit and / or a monomer unit capable of forming a cation is a monomer that is positively charged when the resulting polymer contacts water or an aqueous acid solution.
- the monomer is not particularly limited as long as it is a monomer that forms a unit. Examples of such a monomer include a monomer containing a quaternary ammonium base as a cationic monomer.
- a monomer capable of forming a cation it is cationized to an ammonium salt (for example, amine hydrochloride or amine sulfate) when coming into contact with an aqueous acid solution such as hydrochloric acid and sulfuric acid such as a tertiary amino group.
- an ammonium salt for example, amine hydrochloride or amine sulfate
- an aqueous acid solution such as hydrochloric acid and sulfuric acid such as a tertiary amino group.
- a monomer having a precursor portion (substituent) for example, amine hydrochloride or amine sulfate
- cationic monomer examples include (meth) acryloyloxytrimethylammonium chloride [acryloyloxytrimethylammonium chloride and / or methacryloyloxytrimethylammonium chloride. The same applies hereinafter.
- Quaternary ammonium bases such as (meth) acryloyloxyhydroxypropyltrimethylammonium chloride, (meth) acryloyloxytriethylammonium chloride, (meth) acryloyloxydimethylbenzylammonium chloride, (meth) acryloyloxytrimethylammonium methyl sulfate (Meth) acrylic acid ester monomers; (meth) acrylamidopropyltrimethylammonium chloride, (meth) acrylamidepropyldimethylbenzylammonium chloride and other (meth) acrylamide monomers containing quaternary ammonium bases; It is done.
- the monomer capable of forming a cation include vinyl group-containing cyclic amine monomers such as 2-vinylpyridine and 4-vinylpyridine; tertiary amino groups such as dimethylaminoethyl (meth) acrylate.
- (Meth) acrylic acid ester monomer (meth) acrylamide-containing (meth) acrylamide monomer such as (meth) acrylamide dimethylaminoethyl and N, N-dimethylaminopropylacrylamide; N- (4-anilinophenyl) ) Acrylamide, N- (4-anilinophenyl) methacrylamide, N- (4-anilinophenyl) cinnamamide, N- (4-anilinophenyl) crotonamide, N-phenyl-4- (3-vinylbenzyloxy) ) Aniline, N-phenyl-4- (4-vinylbenzyloxy) aniline and the like. These can be used individually by 1 type or in combination of multiple types.
- a vinyl group-containing cyclic amine monomer a tertiary amino group-containing (meth) acrylic Acid ester monomers and tertiary amino group-containing (meth) acrylamide monomers are preferred, vinyl group-containing cyclic amine monomers and tertiary amino group-containing acrylamide monomers are more preferred, vinyl group-containing cyclic amines Monomers are particularly preferred.
- vinyl group-containing cyclic amine monomer vinyl group-containing pyridines are preferable, and 2-vinylpyridine is particularly preferable.
- the nitrile copolymer rubber (A) used in the present invention preferably contains a conjugated diene monomer unit so that the obtained rubber cross-linked product for hose has rubber elasticity.
- the conjugated diene monomer forming the conjugated diene monomer unit is preferably a conjugated diene having 4 or more carbon atoms, such as 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene, 1 , 3-pentadiene. Of these, 1,3-butadiene is preferred. These can be used individually by 1 type or in combination of multiple types.
- the content ratio of the conjugated diene monomer unit in the nitrile copolymer rubber (A) is preferably 20 to 80% by weight, more preferably 29.9 to 69.9% by weight based on the total monomer units. %, Particularly preferably 34.7 to 59.7% by weight. If the content ratio of the conjugated diene monomer unit is too low, the rubber elasticity of the resulting rubber cross-linked product for hose may be lowered. On the other hand, if the amount is too large, the gasoline permeation resistance of the resulting rubber cross-linked product for hoses may be deteriorated.
- the nitrile copolymer rubber (A) used in the present invention is the above ⁇ , ⁇ -ethylenically unsaturated nitrile monomer unit, cationic monomer unit and / or monomer unit capable of forming a cation,
- other monomer units copolymerizable with the monomers forming these monomer units may be contained.
- 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; non-conjugated diene compounds such as 1,4-pentadiene, 1,4-hexadiene, vinylnorbornene, and dicyclopentadiene; ethylene; propylene, 1-butene, ⁇ -olefin compounds such as 4-methyl-1-pentene, 1-hexene, 1-octene; acrylic acid, methacrylic acid, maleic acid, maleic anhydride, itaconic acid, itaconic anhydride, fumaric acid, fumaric anhydride, etc.
- aromatic vinyl compounds
- ⁇ , ⁇ -Ethylene Saturated carboxylic acids and their anhydrides ⁇ , ⁇ -ethylenically unsaturated monocarboxylic acids such as methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate Alkyl ester; monoethyl maleate, diethyl maleate, monobutyl maleate, dibutyl maleate, monoethyl fumarate, diethyl fumarate, monobutyl fumarate, dibutyl fumarate, monocyclohexyl fumarate, dicyclohexyl fumarate, monoethyl itaconate, itaconic acid Monoesters and diesters of ⁇ , ⁇ -ethylenically unsaturated polyvalent carboxylic acids such as diethyl, monobutyl itaconate, dibutyl itaconate;
- the Mooney viscosity of the nitrile copolymer rubber (A) (hereinafter sometimes referred to as “polymer Mooney viscosity”) (ML 1 + 4 , 100 ° C.) is preferably 3 to 250, more preferably 15 to 180, A preferred range is 20 to 160. If the polymer Mooney viscosity of the nitrile copolymer rubber (A) is too low, the strength properties of the resulting rubber cross-linked product for hose may be reduced. On the other hand, if it is too high, the workability may be deteriorated.
- the nitrile copolymer rubber (A) used in the present invention can be produced by copolymerizing each monomer constituting the nitrile copolymer rubber (A).
- the method for copolymerizing each monomer is not particularly limited. For example, emulsification is performed by using an emulsifier such as sodium dodecylbenzenesulfonate to obtain a latex of a copolymer having an average particle diameter of about 50 to 1,000 nm.
- Suitable is a polymerization method or a suspension polymerization method (including a fine suspension polymerization method) for obtaining an aqueous dispersion of a copolymer having an average particle size of about 0.2 to 200 ⁇ m using a dispersant such as polyvinyl alcohol.
- a dispersant such as polyvinyl alcohol.
- the emulsion polymerization method is more preferable because the polymerization reaction can be easily controlled.
- the emulsion polymerization method is preferably performed according to the following procedure.
- the ⁇ , ⁇ -ethylenically unsaturated nitrile monomer is referred to as “monomer (m1)”
- the conjugated diene monomer is referred to as “monomer (m2)”
- a cationic monomer The monomer capable of forming a body and / or cation is referred to as “monomer (m3)”.
- Monomer mixture (however, the total amount of monomer (m1), monomer (m2) and monomer (m3) is 100% by weight) is subjected to emulsion polymerization, and the polymerization conversion rate However, it is preferable to remove the unreacted monomer as desired after stopping the polymerization reaction at a point of 50 to 95% by weight.
- the resulting rubber cross-linked product for hose deteriorates in oil resistance and gasoline permeation resistance. On the other hand, if it is too large, cold resistance deteriorates. Tend.
- the amount of the monomer (m2) used is too small, the reaction is deactivated at the initial stage of polymerization.
- the gasoline permeation resistance of the resulting hose rubber cross-linked product tends to deteriorate.
- the monomer (m3) within the above range, it is possible to further improve the gasoline permeation resistance of the obtained rubber cross-linked product for hoses. If the polymerization conversion rate for terminating the polymerization reaction is too low, it becomes very difficult to recover the unreacted monomer. On the other hand, when too high, the strength characteristic of the rubber cross-linked product for a hose obtained will deteriorate.
- the polymerization reaction may be started using the total amount of the monomers (m1) to (m3) used in the emulsion polymerization, but the composition distribution of each monomer unit of the copolymer to be produced is controlled. From the viewpoint of obtaining a rubber cross-linked product for a hose that is rich in rubber elasticity, a part of the total amount of the monomers (m1) to (m3) used for emulsion polymerization is used, and a polymerization reaction is started. It is preferable to carry out the polymerization by adding the remainder of the monomers (m1) to (m3) used in the emulsion polymerization to the reactor. This is because, generally, if the total amount of the monomers (m1) to (m3) used for the emulsion polymerization is reacted from the start of the polymerization reaction, the composition distribution of the copolymer spreads.
- the monomer (m1) used for the polymerization is preferably 10 to 100% by weight, more preferably 20 to 100% by weight, particularly preferably 30 to 100% by weight, preferably the monomer (m2) used for the polymerization. Is from 5 to 90% by weight, more preferably from 10 to 80% by weight, particularly preferably from 15 to 70% by weight, and preferably from 0 to 100% by weight, more preferably from 30 to 70% by weight of the monomer (m3) used in the polymerization.
- a monomer mixture comprising 100% by weight, particularly preferably 70 to 100% by weight is charged into the reactor, and after the polymerization reaction is started, the polymerization conversion rate with respect to the monomer mixture charged into the reactor is preferably 5 to 80%.
- the polymerization reaction is started using the above-mentioned amounts of the monomer (m1) and the monomer (m2) used for the polymerization, It is preferable to polymerize by adding the remainder of the bodies (m1) and (m2) to the reactor.
- the method for adding the remaining monomer is not particularly limited, but it may be added all at once, dividedly, or continuously.
- the remaining monomer is preferably added in portions, particularly preferably added in portions 1 to 6 times. preferable.
- the amount of monomer to be added in a divided manner and the timing of the divided addition may be adjusted so as to obtain a desired copolymer in accordance with the progress of the polymerization reaction.
- a latex of the nitrile copolymer rubber (A) can be obtained by removing unreacted monomers using a known method such as heating distillation, vacuum distillation, steam distillation or the like.
- the latex solid content concentration of the nitrile copolymer rubber (A) obtained by the emulsion polymerization method is preferably 5 to 70% by weight, more preferably 10 to 60% by weight.
- the nitrile copolymer rubber (A) used in the present invention is at least one of the carbon-carbon unsaturated bonds in the conjugated diene monomer unit of the copolymer obtained by copolymerization as described above. Hydrogenated nitrile copolymer rubber obtained by hydrogenating a part (hydrogenation reaction) may be used.
- the method for hydrogenation is not particularly limited, and a known method may be employed.
- the nitrile copolymer rubber (A) is a hydrogenated nitrile copolymer rubber, the iodine value is preferably in the range of 0 to 120, more preferably in the range of 4 to 60.
- the inorganic filler (B) is a flat filler having an aspect ratio of 30 to 2,000, and the aspect ratio is preferably 35 to 1,500, more preferably 40 to 1,000, particularly preferably. 45-800.
- a flat inorganic filler (B) it is possible to bring a gasoline permeation blocking effect to the resulting rubber cross-linked product for hoses.
- an inorganic filler having an aspect ratio in the above range is used, and by combining this with the nitrile copolymer rubber (A), a rubber cross-linked product for a hose obtained is obtained. While the gasoline permeation resistance and the sour gasoline resistance are good, the cold resistance can be excellent.
- the aspect ratio of the inorganic filler (B) can be calculated by determining the ratio of the average surface diameter and the average thickness of the primary particles of the inorganic filler (B).
- the surface average diameter and the average thickness are the numbers calculated as the arithmetic average value of the surface diameter and thickness of 100 inorganic fillers (B) randomly selected with an atomic force microscope. Average value.
- the inorganic filler (B) having an aspect ratio of 30 to 2,000 is not particularly limited, and may be derived from a natural product or a product obtained by adding a treatment such as purification to a natural product. It may be a synthetic product. Specific examples include kaolinites such as kaolinite and halosite; smectites such as montmorillonite, beidellite, nontronite, saponite, hectorite, stevensite, mica; and vermiculites; chlorite; talc; E Examples thereof include glass flakes which are amorphous plate-like particles such as glass or C glass, among which smectites are preferable, and montmorillonite, mica and saponite are particularly preferable.
- kaolinites such as kaolinite and halosite
- smectites such as montmorillonite, beidellite, nontronite, saponite, hectorite, stevensite, mica
- vermiculites
- montmorillonite as the inorganic filler (B) is contained as a main component in bentonite. Therefore, as montmorillonite, one obtained by purifying bentonite or the like may be used. it can.
- a nitrile copolymer rubber having a cationic monomer unit and / or a monomer unit capable of forming a cation Because of its excellent dispersibility in In particular, by increasing the dispersibility of the inorganic filler (B) with respect to the nitrile copolymer rubber (A), it is possible to reduce the gasoline permeability of the resulting rubber cross-linked product for hose and lower the embrittlement temperature. .
- the inorganic filler (B) and the cationic monomer unit when the nitrile copolymer rubber (A) contains a cationic monomer unit and / or a monomer unit capable of forming a cation. And / or the ratio of the monomer unit capable of forming a cation is “inorganic filler (B): cationic monomer unit and / or monomer unit capable of forming a cation” 1: It is preferably 0.0005 to 1:30, more preferably 1: 0.003 to 1: 5. If these ratios are out of the above range, the above effect may be difficult to obtain.
- the average particle size (average primary particle size) of the inorganic filler (B) is preferably 0.001 to 20 ⁇ m, more preferably 0.005 to 15 ⁇ m, and still more preferably 0.01 to 10 ⁇ m.
- the average particle diameter of the inorganic filler (B) is defined as a 50% volume cumulative diameter obtained by measuring the particle size distribution by the X-ray transmission method. If the particle size of the inorganic filler (B) is too small, the elongation of the resulting rubber cross-linked product for hose may be reduced. Conversely, if it is too large, a stable latex composition may not be prepared.
- the content of the inorganic filler (B) is preferably 1 to 200 parts by weight, more preferably 2 to 150 parts by weight, and still more preferably 3 to 120 parts by weight with respect to 100 parts by weight of the nitrile copolymer rubber (A). Particularly preferred is 3 to 60 parts by weight. If the amount of the inorganic filler (B) used is too small, there is a risk that the gasoline permeation resistance of the resulting rubber cross-linked product for hose may be reduced or the sour gasoline resistance may be insufficient. On the other hand, when there is too much usage-amount, there exists a possibility that elongation may fall.
- the nitrile copolymer rubber composition for a hose of the present invention contains a predetermined amount of a coupling agent (C) in addition to the nitrile copolymer rubber (A) and the inorganic filler (B).
- the coupling agent (C) means one having a functional group that binds to the hydroxyl group (—OH) on the surface of the inorganic filler (B).
- the coupling agent (C) is not particularly limited, but titanate coupling agents and silane coupling agents are preferred, silane coupling agents are more preferred, and silanes are preferred because the effects of the present invention become even more pronounced.
- the coupling agents those not containing a sulfur atom are particularly preferred.
- the coupling agent (C) used in the present invention preferably has a molecular weight of 400 or less, more preferably 300 or less. If the molecular weight is too large, the effect of adding a coupling agent, that is, the effect of improving cold resistance may not be obtained.
- the coupling agent (C) include sulfide group-containing silane coupling agents such as bis (3- (triethoxysilyl) propyl) disulfide and bis (3- (triethoxysilyl) propyl) tetrasulfide; Mercapto group-containing silane coupling agents such as ⁇ -mercaptopropyltrimethoxysilane, ⁇ -mercaptomethyltrimethoxylane, ⁇ -mercaptomethyltriethoxylane, ⁇ -mercaptohexamethyldisilazane; ⁇ -glycidoxypropyltrimethoxysilane Epoxy group-containing silane coupling agents such as ⁇ -glycidoxypropylmethyldimethoxysilane, ⁇ - (3,4-epoxycyclohexyl) ethyltrimethoxysilane, ⁇ -glycidoxypropylmethyldiethoxysilane; N- ( ⁇ -Aminoethyl)
- the content of the coupling agent (C) is 0.05 to 15 parts by weight, preferably 0.1 to 10 parts by weight, more preferably 0, relative to 100 parts by weight of the nitrile copolymer rubber (A). 2 to 5 parts by weight. If the content of the coupling agent (C) is too small, the effect of improving cold resistance cannot be obtained. On the other hand, if the amount is too large, the gasoline permeation resistance and the solvent crack resistance may be reduced.
- the nitrile copolymer rubber composition for hoses of the present invention contains a glycol compound (D) in addition to the nitrile copolymer rubber (A), inorganic filler (B) and coupling agent (C). Contains a certain amount.
- the nitrile copolymer rubber composition for a hose of the present invention is crosslinked, In this case, the rubber cross-linked product for the hose obtained can be excellent in solvent crack resistance while maintaining good gasoline permeation resistance, cold resistance and sour gasoline resistance.
- the glycol compound (D) refers to a compound having two or more hydroxyl groups in the molecule and having 2 to 6,000 carbon atoms, preferably 2 to 2,000, and particularly preferably 2 to 400 carbon atoms. .
- glycol compound (D) examples include ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol having 8 or more carbon atoms, propylene glycol, polypropylene glycol, butylene glycol, polybutylene glycol, polyoxyethylene-polyoxypropylene.
- Polyoxyalkylene glycols such as glycol, polyoxytetramethylene-polyoxyethylene glycol, polyoxytetramethylene-polyoxypropylene glycol, polyethylene glycol-polypropylene glycol-polyethylene glycol block polymers; polyoxyethylene-bisphenol A ether, polyoxy Propylene-bisphenol A ether, polyoxyethylene-polyoxypropi Bisphenol A derivatives such as poly-bisphenol A ether; polyglycerin, polyoxyethylene glycerin, polyoxypropylene glyceryl ether, polyoxyethylene-polyoxypropylene glyceryl ether, polyoxyethylene-polyoxypropylene trimethylolpropane, polyoxypropylene- Multi-chain polyoxyalkylene glycols such as diglyceryl ether, polyoxyethylene-polyoxypropylene pentaerythritol ether, polyoxypropylene-sorbitol; multi-chain polyoxy such as polyoxyethylene methyl glucoside and poly
- polyoxyalkylene glycol is preferable, and ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol having 8 or more carbon atoms, polypropylene glycol, polybutylene glycol, and polyoxyethylene-polyoxypropylene glycol are more preferable.
- n is 1 to 3,000, preferably 1 to 1,000, more preferably 1 to 200, and particularly preferably 1 to 100.
- ethylene glycol, diethylene glycol, and polyethylene glycol having 8 or more carbon atoms are particularly preferable because the effects of the present invention become even more remarkable.
- the carbon number of polyethylene glycol is preferably 6,000 or less, more preferably 2,000 or less, and particularly preferably 200 or less.
- the content of the glycol compound (D) is 0.05 to 15 parts by weight, preferably 0.1 to 12 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 2 to 9 parts by weight, more preferably 0.3 to 6 parts by weight. If the content of the glycol compound (D) is too small, the effect of improving the solvent crack resistance cannot be obtained. On the other hand, if the amount is too large, strength characteristics, gasoline resistance and cold resistance may be lowered.
- the ratio is preferably 1: 0.001 to 1: 100, more preferably 1: 0.01 to 1:50, and particularly preferably 1: 0.02 to 1: 7.
- the nitrile copolymer rubber composition for hoses of this invention contains the plasticizer further.
- the plasticizer those conventionally used as a plasticizer for blending rubber can be used, and are not particularly limited.
- the SP value (solubility parameter) by the HOY method is 8 to 10.2 (cal / cm 3 ) 1
- a plasticizer that is / 2 is preferably used. If the SP value of the plasticizer is too large, the cold resistance of the resulting rubber cross-linked product for hose tends to be inferior. Moreover, when it is too small, it exists in the tendency for the gasoline permeability resistance of the rubber crosslinked material for hoses obtained to deteriorate.
- plasticizers include, for example, dibutoxyethyl adipate (SP value: 8.8), di (butoxy adipate) Adipic acid such as ethoxyethyl) (SP value: 9.2), adipic acid di (methoxytetraethylene glycol), adipic acid di (methoxypentaethylene glycol), adipic acid (methoxytetraethylene glycol) (methoxypentaethylene glycol) And ether-bonded alcohol ester compounds; ester compounds of azelaic acid and ether-bonded alcohols such as dibutoxyethyl azelate and di (butoxyethoxyethyl) azelate; dibutoxyethyl sebacate, di (butoxyethoxy) sebacate Sebacic acid such as ethyl) and A Ester compounds with tellurium-containing alcohols; ester compounds of phthalic acid and ether
- dibasic acids such as adipic acid, azelaic acid, sebacic acid and phthalic acid, and ether
- dibasic acids such as adipic acid, azelaic acid, sebacic acid and phthalic acid
- ether An ester compound with a bond-containing 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 plasticizer content in the nitrile copolymer composition for hoses of the present invention is preferably 0.1 to 200 parts by weight, more preferably 1 to 100 parts by weight with respect to 100 parts by weight of the nitrile copolymer rubber (A). 150 parts by weight, more preferably 2 to 100 parts by weight.
- the content of the plasticizer is within the above range, in addition to preventing bleeding, the effect of the present invention becomes even more remarkable.
- the nitrile copolymer rubber composition for hoses of the present invention may further contain an acrylic resin and / or a vinyl chloride resin.
- an acrylic resin and / or a vinyl chloride resin By including an acrylic resin and / or a vinyl chloride resin, ozone resistance can be further improved when a rubber cross-linked product for a hose is used.
- the content of the acrylic resin and / or vinyl chloride resin is preferably 10 to 150 parts by weight, more preferably 15 to 120 parts by weight, and still more preferably 20 to 120 parts by weight with respect to 100 parts by weight of the nitrile copolymer rubber (A). 100 parts by weight.
- the addition effect will become difficult to acquire. On the other hand, if too much, cold resistance may be deteriorated.
- the main constituent monomer constituting the resin is vinyl chloride, and the content of the monomer unit is preferably 50 to 100% by weight, more preferably 60 to 100%. % By weight, particularly preferably 70 to 100% by weight.
- the acrylic resin used in the present invention is (meth) acrylic acid alkyl ester as the main constituent monomer constituting the resin, and the content of the monomer unit is preferably 50 to 100% by weight, more preferably Is 60 to 100% by weight, particularly preferably 70 to 100% by weight.
- the number of carbon atoms of the alkyl group is preferably 1-20, more preferably 1-18, and particularly preferably 1-10.
- the average particle diameter of the vinyl chloride resin and the acrylic resin is preferably 0.01 ⁇ m to 1 mm, more preferably 0.05 to 100 ⁇ m, and particularly preferably 0.1 to 10 ⁇ m.
- the average particle size is measured by a laser diffraction scattering particle size distribution measuring device. If the average particle size of the resin is too small, the ozone resistance of the rubber cross-linked product for the hose may be reduced. Conversely, if it is too large, poor dispersion may occur during kneading.
- the Tg (glass transition temperature) of the vinyl chloride resin and the acrylic resin is preferably 50 to 180 ° C., more preferably 60 to 120 ° C.
- the degree of polymerization or the molecular weight of the vinyl chloride resin and the acrylic resin is not particularly limited, but in the case of vinyl chloride resin, the average degree of polymerization according to the solution viscosity method defined in JIS K6721 is preferably 400 to 3,000, more preferably 600 to 2,000.
- the number average molecular weight in terms of standard polystyrene by gel permeation chromatography (GPC) using tetrahydrofuran as a solvent is preferably 10,000 to 7,000,000, more preferably 100,000 to 2,000,000. It is. If the degree of polymerization or the molecular weight is too small, the ozone resistance of the rubber cross-linked product for hoses may be deteriorated. Conversely, if it is too large, the moldability may be inferior.
- the preparation method of the nitrile copolymer rubber composition for hose of the present invention is not particularly limited, but can be prepared by the following method. That is, first, a latex of nitrile copolymer rubber (A) is prepared by the above-described method, and then an aqueous dispersion of inorganic filler (B) is added to the latex of nitrile copolymer rubber (A), and necessary A latex composition is obtained by adding, under stirring, an aqueous dispersion of a plasticizer added according to the above. And after coagulating the obtained latex composition and washing and drying as needed, it can prepare by adding a coupling agent (C) and a glycol compound (D).
- a coupling agent C
- D glycol compound
- the method for adjusting the aqueous dispersion of the inorganic filler (B) is not particularly limited, but may be prepared by adding the inorganic filler (B) while strongly stirring the aqueous medium.
- An aqueous medium containing a dispersing agent such as Na salt of a formalin condensate or a surfactant may be used, and an anionic dispersing agent or surfactant is preferably contained. These can be used individually by 1 type or in combination of multiple types.
- the solid concentration of the aqueous dispersion of the inorganic filler (B) is preferably 1 to 50% by weight, more preferably 2 to 40% by weight.
- the inorganic filler (B) when preparing the aqueous dispersion of the inorganic filler (B), the inorganic filler (B) may be dispersed in water using a wet pulverizer.
- a wet pulverizer By dispersing with a wet pulverizer, when the inorganic filler (B) is secondary agglomerated, the secondary agglomeration of the inorganic filler (B) can be eliminated, and the resulting rubber cross-link for hose Goods can be made more resistant to gasoline permeation.
- Nasmizer manufactured by Yoshida Kikai Kogyo Co., Ltd.
- Super Wing Mill DM-200 manufactured by STEC Co., Ltd.
- Starburst manufactured by Sugino Machine Co., Ltd.
- Star Mill Alignawa Fine
- the method for preparing the aqueous dispersion of the plasticizer when using the plasticizer is not particularly limited, but the aqueous medium containing the surfactant in an amount of 0.5 to 10% by weight of the plasticizer is vigorously stirred. However, it is preferable to prepare by adding a plasticizer.
- Such surfactants include anionic surfactants such as potassium rosinate, sodium lauryl sulfate, potassium oleate, sodium dodecylbenzenesulfonate; polyoxyethylene alkyl ether, polyoxyethylene alkyl ester, polyoxyethylene sorbitan alkyl.
- Nonionic surfactants such as esters; cationic surfactants such as didecyldimethylammonium chloride and stearyltrimethylammonium chloride.
- concentration of the plasticizer in the aqueous dispersion is preferably 5 to 70% by weight.
- a latex state produced by a conventionally known emulsion polymerization method or suspension polymerization method emulsion polymerization method or suspension polymerization method
- a vinyl chloride resin and / or an acrylic resin in the state of an aqueous dispersion is added to the above-mentioned nitrile copolymer rubber (A) with an inorganic filler (B) and a plasticizer added as necessary. What is necessary is just to mix (latex blend) with the obtained latex composition.
- the coagulation of the latex composition is not particularly limited, and known methods such as freeze coagulation, dry coagulation, coagulation with a water-soluble organic liquid, and salting out coagulation are applied. Among these, it is preferable to perform by salting out the latex composition by adding it to an aqueous solution containing a coagulant.
- the coagulant include calcium chloride, sodium chloride, calcium hydroxide, aluminum sulfate, and aluminum hydroxide.
- the amount of the coagulant used is preferably 0.5 to 150 parts by weight, particularly preferably 0.5 to 20 parts by weight, based on 100 parts by weight of the nitrile copolymer rubber (A).
- the nitrile copolymer (A) has a cationic monomer unit and / or a monomer unit capable of forming a cation
- dilute sulfuric acid is used when salting out the latex composition.
- the zeta potential of the functional group possessed by the cationic monomer unit and the monomer unit capable of forming a cation contained in the nitrile copolymer rubber (A) is increased.
- the dispersibility of the inorganic filler (B) can be improved, and the crumb particle size obtained by solidification can be increased.
- the crumb particle size has a great influence on the degree of dehydration in the vibrating screen or squeezer following the coagulation and washing process, the crumb recovery rate, and the degree of drying in the drying process. For example, if the crumb particle size is too small, the crumb particle size will be too small to flow out of the screen, or the polymer will be insufficiently squeezed by the squeezer and the degree of dehydration will decrease. , Productivity deteriorates. Therefore, the average particle diameter of crumb is preferably 0.5 to 40 mm.
- the crumb washing, dehydration and drying methods can be the same as the washing / dehydration method and drying method in general rubber production.
- a washing / dehydrating method a crumb obtained by coagulation and water may be separated using a mesh filter, a centrifugal separator, etc., then washed, and the crumb may be dehydrated with a squeezer or the like.
- a rubber composition can be obtained by drying until a desired moisture content is obtained with a band dryer, a ventilated vertical dryer, a single screw extruder, a twin screw extruder or the like generally used for rubber production. .
- the coupling agent (C) and the glycol compound (D) are added to the rubber composition obtained by coagulating the latex composition and drying as necessary, and a kneading machine such as a roll or a Banbury mixer.
- the nitrile copolymer rubber composition for a hose of the present invention is prepared by kneading with the above.
- the Mooney viscosity (ML 1 + 4 , 100 ° C.) of the nitrile copolymer rubber composition for hoses of the present invention thus obtained is preferably 5 to 300, more preferably 10 to 250.
- the method for preparing the nitrile copolymer rubber composition for a hose of the present invention includes, for example, an inorganic filler (B), a coupling with a latex of a nitrile copolymer rubber (A).
- Agent (C) a plasticizer added as necessary, and an acrylic resin and / or vinyl chloride resin added as necessary, or the total amount of one or more components or a part thereof. Then, it is solidified and dried, and the glycol compound (D) and the remaining components can be kneaded with a kneading machine such as a roll or a Banbury mixer.
- Crosslinkable nitrile copolymer rubber composition for hose The crosslinkable nitrile copolymer rubber composition for hose of the present invention is obtained by adding a crosslinking agent to the nitrile copolymer rubber composition for hose of the present invention described above. It is.
- the crosslinking agent is not particularly limited as long as it is usually used as a crosslinking agent for nitrile copolymer rubber.
- a typical crosslinking agent includes a sulfur-based crosslinking agent or an organic peroxide crosslinking agent that bridges between unsaturated bonds of the nitrile copolymer rubber (A). These can be used individually by 1 type or in combination of multiple types. Among these, a sulfur type crosslinking agent is preferable.
- Sulfur-based crosslinking agents include powdered sulfur, sulfur white, precipitated sulfur, colloidal sulfur, surface-treated sulfur, insoluble sulfur, and other sulfur; sulfur chloride, sulfur dichloride, morpholine disulfide, alkylphenol disulfide, dibenzothiazyl disulfide, N, Sulfur-containing compounds such as N′-dithio-bis (hexahydro-2H-azenopine-2), phosphorus-containing polysulfides, polymer polysulfides; tetramethylthiuram disulfide, selenium dimethyldithiocarbamate, 2- (4′-morpholinodithio) And sulfur donating compounds such as 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 nitrile copolymer rubber composition for hoses of the present invention is not particularly limited, but is preferably 0.1 to 10 with respect to 100 parts by weight of the nitrile copolymer rubber (A). Part by weight, more preferably 0.2 to 5 parts by weight.
- 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 is not particularly limited, but 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).
- crosslinking assistants such as zinc white and stearic acid
- crosslinking accelerators such as guanidine, aldehyde-amine, aldehyde-ammonia, thiazole, sulfenamide, and thiourea
- the amounts of these crosslinking aids and crosslinking accelerators are not particularly limited, and are preferably in the range of 0.1 to 10 parts by weight with respect to 100 parts by weight of the nitrile copolymer rubber (A).
- the nitrile copolymer rubber composition for hoses or the crosslinkable nitrile copolymer rubber composition for hoses of the present invention includes other compounding agents used for general rubber as necessary, such as a crosslinking retarder.
- Additives such as anti-aging agents, fillers other than inorganic filler (B), lubricants, adhesives, lubricants, processing aids, flame retardants, antifungal agents, antistatic agents, colorants, etc. Good.
- an anti-aging agent such as phenol, amine, benzimidazole or phosphoric acid
- an anti-aging agent such as phenol, amine, benzimidazole or phosphoric acid
- 2,2'-methylenebis (4-methyl-6-t-butylphenol) and the like are used for phenols, and 4,4'-bis ( ⁇ , ⁇ -dimethylbenzyl) diphenylamine and N-isopropyl-N 'for amines.
- -Phenyl-p-phenylenediamine and the like, and benzimidazole type include 2-mercaptobenzimidazole and the like. These may be used alone or in combination of two or more.
- fillers other than the inorganic filler (B) include carbon black, silica, calcium carbonate, aluminum silicate, magnesium silicate, calcium silicate, magnesium oxide, short fibers, zinc (meth) acrylate, and (meth) acrylic. And ⁇ , ⁇ -ethylenically unsaturated carboxylic acid metal salts such as magnesium acid. These fillers are subjected to a coupling treatment with a silane coupling agent, a titanium coupling agent, etc., and a surface modification treatment agent with a higher fatty acid derivative or a surfactant such as a higher fatty acid or its metal salt, ester or amide. Can do.
- the nitrile copolymer rubber composition for hose and the crosslinkable nitrile copolymer rubber composition for hose of the present invention are within the range not impairing the effects of the present invention, and the nitrile copolymer rubber (A) and the vinyl chloride resin. Further, rubber or resin other than acrylic resin may be contained.
- the rubber or resin other than the nitrile copolymer rubber (A) is not particularly limited, but acrylic rubber, ethylene-acrylic acid copolymer rubber, fluororubber, styrene-butadiene copolymer rubber, ethylene-propylene copolymer.
- the blending amount of the nitrile copolymer rubber (A) and the rubber or resin other than the vinyl chloride resin and the acrylic resin is preferably 100 weights with respect to 100 parts by weight of the nitrile copolymer rubber (A). Part or less, more preferably 50 parts by weight or less, particularly preferably 30 parts by weight or less.
- the method for preparing the cross-linkable nitrile copolymer rubber composition for hoses of the present invention is not particularly limited, but the above-mentioned nitrile copolymer rubber composition for hoses is added with a cross-linking agent, a cross-linking aid and other compounding agents.
- the method of adding and kneading with a kneading machine such as a roll or a Banbury mixer can be mentioned.
- the blending order is not particularly limited. However, after sufficiently mixing components that are not easily reacted or decomposed by heat, components that are easily reacted by heat or components that are easily decomposed, such as a crosslinking agent, a crosslinking accelerator, etc. Mixing in a short time at a temperature at which no reaction or decomposition occurs.
- the Mooney viscosity (ML 1 + 4 , 100 ° C.) of the crosslinkable nitrile copolymer rubber composition for hoses of the present invention is preferably 5 to 300, more preferably 10 to 250.
- Cross-linked rubber for hose The cross-linked rubber for hose of the present invention is formed by cross-linking the above cross-linkable nitrile copolymer rubber composition for hose.
- a molding machine corresponding to the shape of the molded product to be manufactured for example, an extruder, an injection molding machine, a compression It shape
- the cross-linking may be performed after molding or 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 2 hours.
- the rubber cross-linked product for the hose even if the surface is cross-linked, it may not be sufficiently cross-linked to the inside. .
- the rubber cross-linked product for a hose of the present invention thus obtained is excellent in gasoline permeation resistance, cold resistance, sour gasoline resistance and solvent crack resistance. Therefore, it can be suitably used as a fuel hose or the like by forming a hose consisting of one layer or two or more layers in which the layer (I) comprising the crosslinked rubber for hose of the present invention is at least one layer.
- the layer (I) comprising the crosslinked rubber for hose of the present invention may be used for any of the inner layer, intermediate layer and outer layer.
- the layer (II) other than the layer (I) of the laminate preferably has an ⁇ , ⁇ -ethylenically unsaturated nitrile monomer unit content of 5 to 60% by weight, more preferably 18 to 55% by weight.
- Nitrile copolymer rubber (L) those containing the nitrile copolymer rubber (L) and an acrylic resin and / or vinyl chloride resin, fluorine rubber, chloroprene rubber, hydrin rubber, chlorosulfonated polyethylene rubber, Acrylic rubber, ethylene-acrylic acid copolymer, ethylene-propylene copolymer, ethylene-propylene-diene terpolymer, butyl rubber, isoprene rubber, natural rubber, styrene-butadiene copolymer, fluororesin, polyamide resin, Polyvinyl alcohol, ethylene-vinyl acetate copolymer resin, ethylene-vinyl alcohol copolymer resin, polybuty Non-naphthalate,
- either or both of the layer (I) and the layer (II) are tetrabutylphosphonium benzotriazolate, tetraoctylphosphonium benzo Phosphonium salts such as triazolate, methyltrioctylphosphonium benzotriazolate, tetrabutylphosphonium tolyltriazolate, tetraoctylphosphonium tolyltriazolate; 1,8-diazabicyclo (5.4.0) undecene-7 salt ( DBU salt), 1,5-diazabicyclo (4.3.0) -nonene-5 salt (DBN salt) and the like, and a new layer (between layers (I) and (II) ( III) may be used as an adhesive layer.
- tetrabutylphosphonium benzotriazolate tetraoctylphosphonium benzo Phosphonium salts such as triazolate, methyltrioctylphosphonium benzotriazolate,
- the layer (III) a resin or rubber composition similar to the resin or rubber composition constituting the layer (II) described above can be used. From the viewpoint of improving gasoline permeability resistance, a nitrile copolymer rubber Those containing (L) and an acrylic resin and / or vinyl chloride resin, fluorine rubber, and hydrin rubber are preferred.
- the resin or rubber composition constituting the layer (II) can be used singly or in combination of tetrabutylphosphonium benzotriazolate, tetraoctylphosphonium benzotriazolate, methyltrioctyl.
- Phosphonium salts such as phosphonium benzotriazolate, tetrabutylphosphonium tolyltriazolate, tetraoctylphosphonium tolyltriazolate; 1,8-diazabicyclo (5.4.0) undecene-7 salt (DBU salt), 1,5 -Diazabicyclo (4.3.0) -nonene-5 salt (DBN salt) may be included.
- the thickness of the layer (I) is preferably 0.1 to 10 mm, more preferably 0.5 to 5 mm.
- the thickness of layers other than the layer (I) is preferably 0.1 to 10 mm, more preferably 0.5 to 5 mm.
- the hose including the rubber cross-linked product for the hose of the present invention having the above-described configuration
- it is not particularly limited.
- the hose of the present invention is obtained. Since the crosslinkable nitrile copolymer rubber composition for a hose of the present invention has the property that mandrel cracks are unlikely to occur, it can be produced using a mandrel.
- the cross-linkable nitrile copolymer rubber composition for the hose of the present invention is formed into a cylindrical shape, and the obtained cylinder
- the shape can be fixed by inserting a mandrel into a shaped molded body, and the crosslinkable nitrile copolymer rubber composition for hoses can be crosslinked.
- the hose when the hose is a multilayer one containing the rubber cross-linked product for hose of the present invention, the hose is composed of the cross-linkable nitrile copolymer rubber composition for hose of the present invention and the rubber cross-linked product for hose of the present invention.
- a resin or a rubber composition that will form a layer other than the layer is molded into a cylindrical shape, and the shape is fixed by inserting a mandrel into the obtained cylindrical laminated molded body. It can be produced by crosslinking a crosslinkable nitrile copolymer rubber composition.
- the rubber cross-linked product for a hose of the present invention is used for hoses such as an oil hose, a fuel hose, a filler hose, a gas hose, a brake hose, and a refrigerant hose.
- gas hose include air, nitrogen, oxygen, hydrogen, carbon dioxide, carbon monoxide, methane, ethane, propane, dimethyl ether, LPG, and water vapor.
- the crosslinked rubber product obtained by crosslinking the crosslinkable nitrile copolymer rubber composition for hoses of the present invention is used for hoses as described above, but is used for packing, gaskets, O-rings, oils. It can also be used for seal members such as seals; diaphragms; accumulator pradas; boots;
- the Mooney viscosity (polymer Mooney viscosity) (ML 1 + 4 , 100 ° C.) of the Mooney viscosity nitrile copolymer rubber (hydrogenated nitrile copolymer rubber) was measured according to JIS K6300.
- Gasoline permeability coefficient Prepare the same sheet-like rubber cross-linked product used for evaluation of the above-mentioned normal physical properties, and use "mixture of isooctane, toluene and ethanol in a weight ratio of 2: 2: 1" as fuel oil.
- the gasoline permeability coefficient was measured by the aluminum cup method. Specifically, 50 ml of the above fuel oil is put into a 100 ml capacity aluminum cup, and a sheet-like rubber cross-linked product is placed on the cup, which is then covered with a fastener and a sheet-like rubber cross-linked product.
- the Brittle temperature was measured in accordance with JIS K6261 using the same sheet-like rubber cross-linked product used for the evaluation of the normal state physical properties.
- Sour Gasoline Resistance Test Prepare the same sheet-like rubber cross-linked product used for evaluation of the above-mentioned normal physical properties, and use it as a fuel oil "mixture of isooctane, toluene and ethanol in a weight ratio of 2: 2: 1".
- a test oil in which dilauroyl peroxide is dissolved at a concentration of 3% by weight, the sheet is heated at a temperature of 40 ° C. for 500 hours (the test oil is replaced with a new oil at a rate of twice per 168 hours).
- the rubber cross-linked product was immersed.
- a sample after 500 hours was subjected to a tensile test in accordance with JIS K6253, and the presence or absence of cracks was observed during elongation by the tensile test to evaluate the sour gasoline resistance.
- Solvent crack resistance The same material as the sheet-like rubber cross-linked product used for the evaluation of the above-described normal physical properties was prepared, and a test piece having a length of 100 mm and a width of 10 mm was punched out in a row direction, and was subjected to a bending test of JIS K6260. With the blade to be used, a crack was made by penetrating the center of the test piece to a length of 2 mm in the lateral direction. This test piece was stretched and fixed by 40%, and immersed in a solvent “mixture of isooctane, toluene and ethanol at a weight ratio of 2: 2: 1” set at 40 ° C. And the sample in immersion was observed and the solvent crack-proof evaluation was performed according to the following reference
- Production Example 1 (Production of latex of nitrile copolymer rubber (A1)) A reaction vessel was charged with 240 parts of water, 75.7 parts of acrylonitrile and 2.5 parts of sodium dodecylbenzenesulfonate (emulsifier), and the temperature was adjusted to 5 ° C.
- the content ratio of each monomer unit constituting the obtained nitrile copolymer rubber (A1) was measured by H 1 -NMR using a FT NMR apparatus (JNM-EX400WB) manufactured by JEOL Ltd. It was 50% by weight of the monomer unit and 50% by weight of the 1,3-butadiene unit.
- the Mooney viscosity (polymer Mooney viscosity) of the nitrile copolymer rubber (A1) was 75.
- Production Example 2 (Production of latex of nitrile copolymer rubber (A2))
- the monomer used in the first stage of the emulsion polymerization was used in addition to 2.2 parts of 2-vinylpyridine.
- a latex of nitrile copolymer rubber (A2) (solid content: 24% by weight) was obtained.
- the content ratio of each monomer unit constituting the obtained nitrile copolymer rubber (A2) was measured in the same manner as in Production Example 1. As a result, 50% by weight of acrylonitrile monomer unit and 2% by weight of 2-vinylpyridine were measured. %, And 1,3-butadiene unit was 48% by weight.
- the Mooney viscosity (polymer Mooney viscosity) of the nitrile copolymer rubber (A2) was 73.
- Production Example 3 (Production of latex of hydrogenated nitrile copolymer rubber (A3)) About the latex of the nitrile copolymer rubber (A1) obtained in Production Example 1, a palladium catalyst (1 wt% acetic acid was added to the reactor so that the palladium content was 1000 ppm with respect to the dry rubber weight contained in the latex. A solution obtained by mixing a palladium acetone solution and an equal weight of ion-exchange water) is added, and a hydrogenation reaction is performed at a hydrogen pressure of 3 MPa and a temperature of 50 ° C. for 6 hours to obtain a latex of hydrogenated nitrile copolymer rubber (A3). It was.
- the content ratio of each monomer unit constituting the obtained hydrogenated nitrile copolymer rubber (A3) was measured in the same manner as in Production Example 1. As a result, 50% by weight of acrylonitrile monomer unit, 1,3- The total amount of butadiene units and saturated butadiene units was 50% by weight.
- the hydrogenated nitrile copolymer rubber (A3) had a Mooney viscosity (polymer Mooney viscosity) of 155 and an iodine value of 20.
- Production Example 4 (Production of latex of vinyl chloride resin) A pressure-resistant reaction vessel was charged with 120 parts of water, 0.8 part of sodium lauryl sulfate and 0.06 part of potassium persulfate, and after repeated vacuum degassing twice, 100 parts of vinyl chloride was added and heated while stirring. The emulsion polymerization was carried out at 47 ° C. After the polymerization conversion reached 90%, it was cooled to room temperature to remove unreacted monomers. The concentration of the obtained vinyl chloride resin latex was 41% by weight. The average particle size of the vinyl chloride resin was 0.3 ⁇ m, the average degree of polymerization according to JIS K6721 was 1,300, and the glass transition temperature was 80 ° C.
- Production Example 5 (Production of acrylic resin latex)
- 150 parts of ion exchange water, 2 parts of sodium octyl sulfate, 0.3 part of ammonium persulfate (polymerization initiator), 80 parts of methyl methacrylate, 20 parts of acrylonitrile and t-dodecyl mercaptan (Molecular weight adjusting agent) 0.05 part was added, emulsion polymerization was started at a temperature of 80 ° C. with stirring, and the reaction was stopped after 5 hours to obtain a latex.
- the resulting acrylic resin latex had a concentration of 39% by weight and a polymerization conversion rate of 98% by weight.
- the average particle diameter of the acrylic resin was 0.2 ⁇ m, the number average molecular weight was 600,000, and the glass transition temperature was 103 ° C.
- Example 1 Preparation of latex composition of nitrile copolymer rubber 100 parts of purified bentonite (trade name “Bengel HV”, manufactured by Hojun Co., Ltd., aspect ratio: 295) as inorganic filler (B) is added to 1995 parts of distilled water. The mixture was added in the presence of 5 parts of sodium acrylate and stirred vigorously to obtain an aqueous dispersion of an inorganic filler (B) having a solid content concentration of 5%.
- bentonite trade name “Bengel HV”, manufactured by Hojun Co., Ltd., aspect ratio: 295
- a 50% by weight aqueous emulsion of di (butoxyethoxyethyl) adipate product name “Adekasizer RS-107”, manufactured by ADEKA, plasticizer
- potassium oleate as an emulsifier
- the aqueous dispersion of the inorganic filler (B) is composed of 20 parts of the inorganic filler (B) with respect to 100 parts of the latex solid content (nitrile copolymer rubber amount) of the nitrile copolymer rubber (A1).
- the solid content (nitrile copolymer rubber and inorganic filler (B)) concentration was 15%.
- di (butoxyethoxyethyl) adipate prepared above was added to 100 parts of the nitrile copolymer rubber (A1) in a solution in which the inorganic filler (B) was dispersed in the nitrile copolymer rubber (A1).
- the obtained nitrile copolymer latex composition is an aqueous solution containing calcium chloride (coagulant) in an amount of 4% by weight with respect to the amount of nitrile copolymer rubber (A1) in the latex composition.
- Example 2 Except for changing the blending amount of polyethylene glycol as the glycol compound (D) from 4 parts to 0.5 parts (Example 2) and 8 parts (Example 3), respectively, A crosslinkable nitrile copolymer rubber composition for hoses was prepared and evaluated in the same manner as in Example 1. The results are shown in Table 1.
- Examples 4 and 5 As the glycol compound (D), a hose was prepared in the same manner as in Example 1 except that 4 parts of ethylene glycol (Example 4) and 4 parts of diethylene glycol (Example 5) were used instead of 4 parts of polyethylene glycol, respectively.
- a crosslinkable nitrile copolymer rubber composition was prepared and evaluated in the same manner as in Example 1. The results are shown in Table 1.
- Examples 6 and 7 The amount of ⁇ - (3,4-epoxycyclohexyl) ethyltrimethoxysilane as coupling agent (C) was changed from 2 parts to 0.1 parts (Example 6) and 10 parts (Example 7), respectively. Except that, a crosslinkable nitrile copolymer rubber composition for a hose was prepared in the same manner as in Example 1 and evaluated in the same manner as in Example 1. The results are shown in Table 1.
- Example 8 Crosslinkable nitrile copolymer rubber for hose in the same manner as in Example 1 except that the nitrile copolymer rubber (A2) obtained in Production Example 2 was used instead of the nitrile copolymer rubber (A1). Compositions were prepared and evaluated in the same manner. The results are shown in Table 1.
- Example 9 When preparing the latex composition of the nitrile copolymer rubber, 100 parts of the nitrile copolymer rubber (A2), latex of the vinyl chloride resin obtained in Production Example 4 (45 parts of vinyl chloride resin) Nitrile copolymer rubber (A2) and inorganic filler (B) in the same manner as in Example 8 except that the blending amount of di (butoxyethoxyethyl) adipate as a plasticizer was changed to 20 parts. ), A crumb consisting of a mixture of plasticizer and vinyl chloride resin.
- the obtained crumb was filtered, washed with water, dried under reduced pressure at 60 ° C., and then, using a Banbury mixer, the dried crumb was added to 100 parts of the nitrile copolymer rubber (A2) in the crumb.
- 0.5 parts of ⁇ - (3,4-epoxycyclohexyl) ethyltrimethoxysilane as a coupling agent (C) and polyethylene glycol as a glycol compound (D) product name: polyethylene glycol 4,000, 2 parts of Koyo Pure Chemical Industries, Ltd., average molecular weight 3,000
- Example 10 When preparing a latex composition of nitrile copolymer rubber, instead of the vinyl chloride resin latex obtained in Production Example 4 with respect to 100 parts of nitrile copolymer rubber (A2), Production Example 5 A crosslinkable nitrile copolymer rubber composition for hoses was prepared in the same manner as in Example 9 except that the latex of acrylic resin obtained (45 parts of acrylic resin) was added. Evaluation was performed. The results are shown in Table 1.
- Comparative Example 1 A crosslinkable nitrile copolymer rubber composition for hoses was prepared in the same manner as in Example 1 except that polyethylene glycol as the glycol compound (D) was not used, and evaluated in the same manner as in Example 1. . The results are shown in Table 1.
- Comparative Example 2 A crosslinkable nitrile copolymer rubber composition for a hose was prepared in the same manner as in Example 1 except that the blending amount of polyethylene glycol as the glycol compound (D) was changed from 4 parts to 30 parts. Evaluation was performed in the same manner as in 1. The results are shown in Table 1.
- Comparative Example 3 A crosslinkable nitrile copolymer rubber composition for hoses was prepared in the same manner as in Example 1 except that ⁇ - (3,4-epoxycyclohexyl) ethyltrimethoxysilane was not used as the coupling agent (C). Prepared and evaluated in the same manner as in Example 1. The results are shown in Table 1.
- Comparative Example 4 Crosslinkability for hose in the same manner as in Example 1, except that the amount of ⁇ - (3,4-epoxycyclohexyl) ethyltrimethoxysilane as coupling agent (C) was changed from 2 parts to 30 parts.
- a nitrile copolymer rubber composition was prepared and evaluated in the same manner as in Example 1. The results are shown in Table 1.
- Comparative Example 5 A hose was prepared in the same manner as in Example 1, except that polyethylene glycol as the glycol compound (D) and ⁇ - (3,4-epoxycyclohexyl) ethyltrimethoxysilane as the coupling agent (C) were not used.
- a crosslinkable nitrile copolymer rubber composition was prepared and evaluated in the same manner as in Example 1. The results are shown in Table 1.
- Comparative Example 6 A crosslinkable nitrile copolymer rubber composition for hoses was prepared in the same manner as in Example 1 except that the purified bentonite as the inorganic filler (B) was not used, and evaluation was performed in the same manner as in Example 1. It was. The results are shown in Table 1.
- Comparative Example 7 Similar to Example 1 except that 20 parts of magnesium silicate (aspect ratio: 11, product name: Mistron Vapor, manufactured by Nippon Mystron) was used instead of 20 parts of purified bentonite as the inorganic filler (B). Thus, a crosslinkable nitrile copolymer rubber composition for hoses was prepared and evaluated in the same manner as in Example 1. The results are shown in Table 1.
- Example 11 Crosslinkable hydrogenated nitrile for hose in the same manner as in Example 1 except that the hydrogenated nitrile copolymer rubber (A3) obtained in Production Example 3 was used instead of the nitrile copolymer rubber (A1).
- a copolymer rubber composition was prepared and evaluated in the same manner. The results are shown in Table 2.
- Comparative Example 8 A hose was prepared in the same manner as in Example 11 except that polyethylene glycol as the glycol compound (D) and ⁇ - (3,4-epoxycyclohexyl) ethyltrimethoxysilane as the coupling agent (C) were not used.
- a crosslinkable hydrogenated nitrile copolymer rubber composition was prepared and evaluated in the same manner as in Example 1. The results are shown in Table 2.
- the nitrile copolymer rubber (A) having a predetermined composition, the inorganic filler (B) having an aspect ratio of 30 to 2,000, the coupling agent (C), and a specific glycol compound A rubber cross-linked product obtained by cross-linking a nitrile copolymer rubber composition (including “hydrogenated nitrile copolymer rubber composition”) containing (D) in a predetermined ratio has good normal physical properties.
- the gasoline permeability coefficient was small, the embrittlement temperature was low, the sour gasoline resistance and the solvent crack resistance were excellent, and the results were particularly suitable for use in hoses (Examples 1 to 11).
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Abstract
Description
また、前記グリコール化合物(D)が、下記一般式(1)で表されることが好ましい。
好ましくは、前記ニトリル共重合体ゴム(A)が、カチオン性単量体単位および/またはカチオンを形成可能な単量体単位をさらに有し、前記ニトリル共重合体ゴム(A)中における、前記カチオン性単量体単位および/またはカチオンを形成可能な単量体単位の含有割合が、0.1~30重量%である。
好ましくは、本発明のホース用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。
好ましくは、前記ニトリル共重合体ゴム(A)が、炭素-炭素不飽和結合部分のうち少なくとも一部が水素化された水素化ニトリル共重合体ゴムである。
好ましくは、本発明のホース用ニトリル共重合体ゴム組成物は、前記ニトリル共重合体ゴム(A)100重量部に対して、10~150重量部の塩化ビニル樹脂および/またはアクリル樹脂をさらに含有する。
本発明によれば、上記ホース用架橋性ニトリル共重合体ゴム組成物を架橋してなるホース用ゴム架橋物が提供される。
さらに、本発明によれば、上記ホース用架橋性ニトリル共重合体ゴム組成物を筒状に成形し、マンドレルを挿入して得られる成形体を、架橋して得られるホースが提供される。本発明のホースは、好ましくは、上記ホース用架橋性ニトリル共重合体ゴム組成物からなる層を含む2層以上の積層体を筒状に成形し、マンドレルを挿入して得られる成形体を、架橋して得られるものである。
本発明のホース用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20~80重量%を有するニトリル共重合体ゴム(A)と、アスペクト比が30~2,000である無機充填剤(B)と、カップリング剤(C)と、グリコール化合物(D)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、前記カップリング剤(C)の比率が0.05~15重量部、前記グリコール化合物(D)の比率が0.05~15重量部であるニトリル共重合体ゴムの組成物である。
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20~80重量%を有するゴムである。
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。
なお、ビニル基含有環状アミン単量体としては、ビニル基含有ピリジン類が好ましく、2-ビニルピリジンが特に好ましい。
なお、以下において、適宜、α,β-エチレン性不飽和ニトリル単量体を「単量体(m1)」とし、共役ジエン単量体を「単量体(m2)」とし、カチオン性単量体および/またはカチオンを形成可能な単量体を「単量体(m3)」とする。
なお、重合反応を停止する重合転化率が低すぎると、未反応の単量体の回収が非常
に困難になる。一方、高すぎると、得られるホース用ゴム架橋物の強度特性が悪化する。
ここで、カップリング剤(C)とは、無機充填剤(B)の表面の水酸基(-OH)と結合する官能基を有するものをいう。
カップリング剤(C)を含有させることにより、ニトリル共重合体ゴム(A)と無機充填剤(B)との分散性をより向上させることができ、かつ、ホース用ゴム架橋物とした場合における耐寒性の向上を図ることができる。なお、カップリング剤(C)としては、特に限定されないが、本発明の効果がより一層顕著になることからチタネート系カップリング剤およびシランカップリング剤が好ましく、シランカップリング剤がより好ましく、シランカップリング剤のなかでも、硫黄原子を含有しないものが特に好ましい。
これらのなかでも、ポリオキシアルキレングリコールが好ましく、エチレングリコール、ジエチレングリコール、トリエチレングリコール、炭素数8以上のポリエチレングリコール、ポリプロピレングリコール、ポリブチレングリコール、ポリオキシエチレン-ポリオキシプロピレングリコールがより好ましい。
なお、ポリエチレングリコールの炭素数は、6,000以下が好ましく、2,000以下がより好ましく、200以下が特に好ましい。
本発明に用いられるアクリル樹脂とは、樹脂を構成する主構成単量体が(メタ)アクリル酸アルキルエステルであって、該単量体単位の含有量が好ましくは50~100重量%、より好ましくは60~100重量%、特に好ましくは70~100重量%である。アルキル基の炭素数は、好ましくは1~20、より好ましくは1~18、特に好ましくは1~10である。
塩化ビニル樹脂とアクリル樹脂の重合度または分子量は、特に限定されないが、塩化ビニル樹脂では、JIS K6721に規定の溶液粘度法による平均重合度が、好ましくは400~3,000、より好ましくは600~2,000である。アクリル樹脂では、テトラヒドロフランを溶剤とするゲルパーミエーションクロマトグラフィ(GPC)による標準ポリスチレン換算の数平均分子量が、好ましくは10,000~7,000,000、より好ましくは100,000~2,000,000である。
重合度または分子量が小さすぎるとホース用ゴム架橋物の耐オゾン性が悪化するおそれがあり、逆に、大きすぎると成型加工性に劣る場合がある。
本発明のホース用ニトリル共重合体ゴム組成物の調製方法は、特に限定されないが、次の方法により調製することができる。すなわち、まず、上記した方法により、ニトリル共重合体ゴム(A)のラテックスを調製し、次いで、ニトリル共重合体ゴム(A)のラテックスに、無機充填剤(B)の水性分散液、および必要に応じて添加される可塑剤の水性分散液を攪拌下で添加することによりラテックス組成物を得る。そして、得られたラテックス組成物を凝固し、必要に応じて水洗・乾燥した後に、カップリング剤(C)、グリコール化合物(D)を添加することにより調製することができる。
本発明のホース用架橋性ニトリル共重合体ゴム組成物は、上記した本発明のホース用ニトリル共重合体ゴム組成物に、架橋剤を加えてなるものである。
本発明のホース用ゴム架橋物は、上記ホース用架橋性ニトリル共重合体ゴム組成物を架橋してなる。
本発明のホース用架橋性ニトリル共重合体ゴム組成物を架橋する際には、製造する成形品(ホース用ゴム架橋物)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、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~2時間である。
なお、本発明のホース用架橋性ニトリル共重合体ゴム組成物を架橋してなるゴム架橋物は、上述のとうり、ホース用として用いられるものであるが、パッキン、ガスケット、O-リング、オイルシール等のシール部材;ダイアフラム類;アキュムレータプラダ;ブーツ類;などに用いることもできる。
ニトリル共重合体ゴム(水素化ニトリル共重合体ゴム)のムーニー粘度(ポリマー・ムーニー粘度)(ML1+4、100℃)は、JIS K6300に準拠して測定した。
ホース用架橋性ニトリル共重合体ゴム組成物(「ホース用架橋性水素化ニトリル共重合体ゴム組成物」の場合も含む)を縦15cm、横15cm、深さ0.2cmの金型に入れ、加圧しながら160℃で20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てJIS K6251に従い、ダンベル状3号形で打ち抜いた試験片を用いてゴム架橋物の引張強さ、伸びおよび100%引張応力を、また、JIS K6253に従い、デュロメータ硬さ試験機タイプAを用いてゴム架橋物の硬さを、それぞれ測定した。
上記常態物性の評価に用いたシート状のゴム架橋物と同様のものを準備し、燃料油として「イソオクタンとトルエンとエタノールを重量比2:2:1で混合したもの」を使用して、アルミカップ法によりガソリン透過係数を測定した。具体的には、100ml容量のアルミニウム製のカップに、上記燃料油を50ml入れ、その上にシート状のゴム架橋物をのせ、これで蓋をして、締め具で、シート状のゴム架橋物によりアルミカップ内外を隔てる面積が25.50cm2になるように調整し、該アルミカップを23℃の恒温槽内にて、放置し、24時間毎に重量測定することにより24時間毎の油の透過量を測定し、その最大量を透過量とするものである(単位:g・mm/m2・day)。
なお、ガソリン透過係数は値が低い程、好ましい。
上記常態物性の評価に用いたシート状のゴム架橋物と同様のものを用い、JIS K6261に従い、脆化温度を測定した。
上記常態物性の評価に用いたシート状のゴム架橋物と同様のものを準備し、燃料油としての「イソオクタンとトルエンとエタノールを重量比2:2:1で混合したもの」にジラウロイルペルオキシドを3重量%の濃度で溶解させた試験油中に、温度40℃、500時間(試験油は168時間当たり2回の割合で新規のものと交換した。)の条件にて、シート状のゴム架橋物を浸漬させた。そして、500時間経過後のサンプルについて、JIS K6253に準拠して、引張試験を行い、引張試験による伸長時にクラックの発生の有無を観察し、耐サワーガソリン性を評価した。
上記常態物性の評価に用いたシート状のゴム架橋物と同様のものを準備し、縦100mm、横10mmの試験片を列理方向に打ち抜いて作製し、JIS K6260の屈曲試験で用いる刃で、試験片の中心部に横方向2mmの長さに貫通させて亀裂を入れた。この試験片を40%伸長させて固定し、40℃に設定した溶剤「イソオクタンとトルエンとエタノールを重量比2:2:1で混合したもの」に浸漬させた。そして、浸漬中のサンプルを観察し、下記の基準に従って、耐ソルベントクラック性の評価を行った。破断するまでの時間が長いほど耐ソルベントクラック性に優れる。
○:試験片が破断するまでの時間が5分以上
×:試験片が破断するまでの時間が5分未満
反応容器に、水240部、アクリロニトリル75.7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22部、重合開始剤であるパラメンタンヒドロペルオキシド0.06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。反応開始後、仕込み単量体に対する重合転化率が42重量%、60重量%に達した時点で、反応容器に1,3-ブタジエンをそれぞれ12部および12部追加して2段目および3段目の重合反応を行った。その後、仕込み全単量体に対する重合転化率が75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(A1)のラテックス(固形分24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として、アクリロニトリル75.7部および1,3-ブタジエン22部に加えて、2-ビニルピリジン2.2部をさらに使用した以外は、製造例1と同様にして、ニトリル共重合体ゴム(A2)のラテックス(固形分:24重量%)を得た。
製造例1において得られたニトリル共重合体ゴム(A1)のラテックスについて、該ラテックスに含有される乾燥ゴム重量に対してパラジウム含有量が1000ppmになるように反応器にパラジウム触媒(1重量%酢酸パラジウムアセトン溶液と等重量のイオン交換水を混合した溶液)を添加して、水素圧3MPa、温度50℃で6時間水素添加反応を行い、水素化ニトリル共重合体ゴム(A3)のラテックスを得た。
耐圧反応容器に、水120部、ラウリル硫酸ナトリウム0.8部および過硫酸カリウム0.06部を仕込んで、減圧脱気を2回くり返した後、塩化ビニルを100部仕込み、攪拌しつつ加温して47℃にて乳化重合を行った。重合転化率が90%に達した後、室温に冷却して未反応単量体を除去した。得られた塩化ビニル樹脂ラテックスの濃度は41重量%であった。塩化ビニル樹脂の平均粒径は0.3μmであり、JIS K6721による平均重合度は1,300、ガラス転移温度は80℃であった。
温度計、撹拌装置を備えた反応器に、イオン交換水150部、オクチル硫酸ナトリウム2部、過硫酸アンモニウム(重合開始剤)0.3部、メタクリル酸メチル80部、アクリロニトリル20部およびt-ドデシルメルカプタン(分子量調整剤)0.05部を入れ、攪拌しながら温度80℃にて乳化重合を開始し、5時間後に反応を停止してラテックスを得た。得られたアクリル樹脂ラテックスの濃度は39重量%で重合転化率は98重量%であった。アクリル樹脂の平均粒径は0.2μmであり、数平均分子量は600,000、ガラス転移温度は103℃であった。
ニトリル共重合体ゴムのラテックス組成物の調製
無機充填剤(B)としての精製ベントナイト(商品名「ベンゲル HV」、株式会社ホージュン製、アスペクト比:295)100部を、蒸留水1995部に、ポリアクリル酸ナトリウム5部の存在下に添加して強攪拌し、固形分濃度5%の無機充填剤(B)の水性分散液を得た。また、アジピン酸ジ(ブトキシエトキシエチル)(製品名「アデカサイザーRS-107」、ADEKA社製、可塑剤)の50重量%水性エマルジョンを、乳化剤としてのオレイン酸カリウムを該可塑剤の2重量%使用し、強撹拌下で混合して調製した。
そして、得られたクラムを濾別、水洗した後、60℃で減圧乾燥し、次いで、バンバリーミキサーを用いて、上記乾燥クラムに、該クラム中のニトリル共重合体ゴム(A1)100部に対して、カップリング剤(C)としてのβ-(3,4-エポキシシクロヘキシル)エチルトリメトキシシラン(分子量246.4)を2部、グリコール化合物(D)としてのポリエチレングリコール(製品名:ポリエチレングリコール4,000、和光純薬工業株式会社製、平均分子量3,000)4部、MTカーボンブラック(「Thermax(R) medium thermal carbon black N990」、CANCARB社製)10部、架橋助剤としての亜鉛華5部およびステアリン酸1部を添加して50℃にて混合した。そして、この混合物をロールに移して架橋剤である325メッシュ硫黄0.5部およびテトラメチルチウラムジスルフィド(商品名「ノクセラーTT」、大内新興化学工業社製)1.5部、およびN-シクロヘキシル-2-ベンゾチアゾリルスルフェンアミド(商品名「ノクセラーCZ」、大内新興化学工業社製、架橋促進剤)1.5部を添加して50℃で混練し、ホース用架橋性ニトリル共重合体ゴム組成物を調製した。
グリコール化合物(D)としてのポリエチレングリコールの配合量を4部から、それぞれ、0.5部(実施例2)、8部(実施例3)に変更した以外は、実施例1と同様にして、ホース用架橋性ニトリル共重合体ゴム組成物を調製し、実施例1と同様に評価を行った。結果を表1に示す。
グリコール化合物(D)として、ポリエチレングリコール4部の代わりに、それぞれ、エチレングリコール4部(実施例4)、ジエチレングリコール4部(実施例5)を使用した以外は、実施例1と同様にして、ホース用架橋性ニトリル共重合体ゴム組成物を調製し、実施例1と同様に評価を行った。結果を表1に示す。
カップリング剤(C)としてのβ-(3,4-エポキシシクロヘキシル)エチルトリメトキシシランの配合量を2部から、それぞれ0.1部(実施例6)、10部(実施例7)に変更した以外は、実施例1と同様にして、ホース用架橋性ニトリル共重合体ゴム組成物を調製し、実施例1と同様に評価を行った。結果を表1に示す。
ニトリル共重合体ゴム(A1)の代わりに、製造例2で得られたニトリル共重合体ゴム(A2)を用いた以外は、実施例1と同様にして、ホース用架橋性ニトリル共重合体ゴム組成物を調製し、同様にして評価を行った。結果を表1に示す。
ニトリル共重合体ゴムのラテックス組成物を調製する際に、ニトリル共重合体ゴム(A2)100部に対して、製造例4にて得られた塩化ビニル樹脂のラテックス(塩化ビニル樹脂は45部)をさらに添加し、可塑剤としてのアジピン酸ジ(ブトキシエトキシエチル)の配合量を20部に変更した以外は、実施例8と同様にしてニトリル共重合体ゴム(A2)、無機充填剤(B)、可塑剤、および、塩化ビニル樹脂の混合物からなるクラムを生成させた。
そして、得られたクラムを濾別、水洗した後、60℃で減圧乾燥し、次いで、バンバリーミキサーを用いて、上記乾燥クラムに、該クラム中のニトリル共重合体ゴム(A2)100部に対して、カップリング剤(C)としてのβ-(3,4-エポキシシクロヘキシル)エチルトリメトキシシランを0.5部、グリコール化合物(D)としてのポリエチレングリコール(製品名:ポリエチレングリコール4,000、和光純薬工業株式会社製、平均分子量3,000)を2部添加し、180℃で混合した。そして、この混合物をロールに移して冷却した後、再び、バンバリーミキサーを用いて、MTカーボンブラック(「Thermax(R) medium thermal carbon black N990」、CANCARB社製)10部、可塑剤としてのアジピン酸ジ(ブトキシエトキシエチル)を25部、架橋助剤としての亜鉛華5部およびステアリン酸1部を添加して50℃にて混合した。そして、この混合物をロールに移して架橋剤である325メッシュ硫黄0.6部およびテトラメチルチウラムジスルフィド(商品名「ノクセラーTT」、大内新興化学工業社製)2部、およびN-シクロヘキシル-2-ベンゾチアゾリルスルフェンアミド(商品名「ノクセラーCZ」、大内新興化学工業社製、架橋促進剤)2部を添加して50℃で混練し、ホース用架橋性ニトリル共重合体ゴム組成物を調製し、実施例1と同様に評価を行った。結果を表1に示す。
ニトリル共重合体ゴムのラテックス組成物を調製する際に、ニトリル共重合体ゴム(A2)100部に対して、製造例4にて得られた塩化ビニル樹脂のラテックスの代わりに、製造例5にて得られたアクリル樹脂のラテックス(アクリル樹脂は45部)を添加した以外は、実施例9と同様にして、ホース用架橋性ニトリル共重合体ゴム組成物を調製し、実施例1と同様に評価を行った。結果を表1に示す。
グリコール化合物(D)としてのポリエチレングリコールを使用しなかった以外は、実施例1と同様にして、ホース用架橋性ニトリル共重合体ゴム組成物を調製し、実施例1と同様に評価を行った。結果を表1に示す。
グリコール化合物(D)としてのポリエチレングリコールの配合量を4部から、30部に変更した以外は、実施例1と同様にして、ホース用架橋性ニトリル共重合体ゴム組成物を調製し、実施例1と同様に評価を行った。結果を表1に示す。
カップリング剤(C)としてのβ-(3,4-エポキシシクロヘキシル)エチルトリメトキシシランを使用しなかった以外は、実施例1と同様にして、ホース用架橋性ニトリル共重合体ゴム組成物を調製し、実施例1と同様に評価を行った。結果を表1に示す。
カップリング剤(C)としてのβ-(3,4-エポキシシクロヘキシル)エチルトリメトキシシランの配合量を2部から、30部に変更した以外は、実施例1と同様にして、ホース用架橋性ニトリル共重合体ゴム組成物を調製し、実施例1と同様に評価を行った。結果を表1に示す。
グリコール化合物(D)としてのポリエチレングリコール、およびカップリング剤(C)としてのβ-(3,4-エポキシシクロヘキシル)エチルトリメトキシシランを使用しなかった以外は、実施例1と同様にして、ホース用架橋性ニトリル共重合体ゴム組成物を調製し、実施例1と同様に評価を行った。結果を表1に示す。
無機充填剤(B)としての精製ベントナイトを使用しなかった以外は、実施例1と同様にして、ホース用架橋性ニトリル共重合体ゴム組成物を調製し、実施例1と同様に評価を行った。結果を表1に示す。
無機充填剤(B)としての精製ベントナイト20部の代わりに、ケイ酸マグネシウム(アスペクト比:11、製品名:ミストロンベーパー、日本ミストロン社製)20部を使用した以外は、実施例1と同様にして、ホース用架橋性ニトリル共重合体ゴム組成物を調製し、実施例1と同様に評価を行った。結果を表1に示す。
ニトリル共重合体ゴム(A1)の代わりに、製造例3で得られた水素化ニトリル共重合体ゴム(A3)を用いた以外は、実施例1と同様にして、ホース用架橋性水素化ニトリル共重合体ゴム組成物を調製し、同様にして評価を行った。結果を表2に示す。
グリコール化合物(D)としてのポリエチレングリコール、およびカップリング剤(C)としてのβ-(3,4-エポキシシクロヘキシル)エチルトリメトキシシランを使用しなかった以外は、実施例11と同様にして、ホース用架橋性水素化ニトリル共重合体ゴム組成物を調製し、実施例1と同様に評価を行った。結果を表2に示す。
また、シランカップリング剤(C)を含有しない場合には、耐ガソリン透過性に劣り、脆化温度が高くなる結果となり(比較例3)、シランカップリング剤(C)の配合量が多すぎる場合には、引張強さ、耐ガソリン透過性および耐ソルベントクラック性に劣る結果となった(比較例4)。
特定のグリコール化合物(D)およびシランカップリング剤(C)のいずれも含有しない場合には、耐ガソリン透過性に劣り、脆化温度が高くなる結果となった(比較例5)。
さらに、無機充填剤(B)を含有しない場合およびアスペクト比が30未満である無機充填剤を使用した場合には、引張強さ、耐ガソリン透過性および耐サワーガソリン性に劣る結果となった(比較例6~7)。
また、水素化ニトリル共重合体ゴムを用いた場合に、特定のグリコール化合物(D)およびシランカップリング剤(C)のいずれも含有しないときは、耐ガソリン透過性および耐ソルベントクラック性に劣る結果となった(比較例8)。
Claims (12)
- α,β-エチレン性不飽和ニトリル単量体単位20~80重量%を有するニトリル共重合体ゴム(A)と、アスペクト比が30~2,000である無機充填剤(B)と、カップリング剤(C)と、グリコール化合物(D)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、前記カップリング剤(C)の比率が0.05~15重量部、前記グリコール化合物(D)の比率が0.05~15重量部であるホース用ニトリル共重合体ゴム組成物。 - 前記グリコール化合物(D)が、エチレングリコール、ジエチレングリコールおよび炭素数8以上のポリエチレングリコールから選択される少なくとも1種である請求項2に記載のホース用ニトリル共重合体ゴム組成物。
- 前記ニトリル共重合体ゴム(A)が、カチオン性単量体単位および/またはカチオンを形成可能な単量体単位をさらに有し、前記ニトリル共重合体ゴム(A)中における、前記カチオン性単量体単位および/またはカチオンを形成可能な単量体単位の含有割合が、0.1~30重量%である請求項1~3のいずれかに記載のホース用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。
- 前記ニトリル共重合体ゴム(A)が、炭素-炭素不飽和結合部分のうち少なくとも一部が水素化された水素化ニトリル共重合体ゴムである請求項1~5のいずれかに記載のホース用ニトリル共重合体ゴム組成物。
- 前記ニトリル共重合体ゴム(A)100重量部に対して、10~150重量部の塩化ビニル樹脂および/またはアクリル樹脂をさらに含有する請求項1~6のいずれかに記載のホース用ニトリル共重合体ゴム組成物。
- 請求項1~7のいずれかに記載のホース用ニトリル共重合体ゴム組成物と架橋剤とを含有してなるホース用架橋性ニトリル共重合体ゴム組成物。
- 請求項8に記載のホース用架橋性ニトリル共重合体ゴム組成物を架橋してなるホース用ゴム架橋物。
- 2以上の層からなり、少なくとも1層が請求項9に記載のホース用ゴム架橋物から構成されるホース用積層体。
- 請求項8に記載のホース用架橋性ニトリル共重合体ゴム組成物を筒状に成形し、マンドレルを挿入して得られる成形体を、架橋して得られるホース。
- 請求項8に記載のホース用架橋性ニトリル共重合体ゴム組成物からなる層を含む2層以上の積層体を筒状に成形し、マンドレルを挿入して得られる成形体を、架橋して得られるホース。
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CN116285049B (zh) * | 2022-12-13 | 2023-10-13 | 江苏多肯新材料有限公司 | 一种车用橡胶软管材料及其制备方法 |
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WO2013133358A1 (ja) * | 2012-03-08 | 2013-09-12 | 日本ゼオン株式会社 | ニトリル共重合体ゴム組成物の製造方法 |
RU2502759C1 (ru) * | 2012-05-11 | 2013-12-27 | Федеральное государственное бюджетное учреждение науки Институт проблем нефти и газа Сибирского отделения Российской академии наук | Износостойкая резина на основе пропиленоксидного каучука и ультрадисперсного политетрафторэтилена |
US10100179B2 (en) | 2014-12-23 | 2018-10-16 | Lg Chem, Ltd. | Latex composition for dip forming and dip-formed article prepared therefrom |
JP2018506592A (ja) * | 2014-12-23 | 2018-03-08 | エルジー・ケム・リミテッド | ディップ成形用ラテックス組成物及びこれから製造されたディップ成形品 |
KR20170118708A (ko) | 2015-02-16 | 2017-10-25 | 니폰 제온 가부시키가이샤 | 고무 가교물 |
JPWO2016132978A1 (ja) * | 2015-02-16 | 2017-11-24 | 日本ゼオン株式会社 | ゴム架橋物 |
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WO2016132978A1 (ja) * | 2015-02-16 | 2016-08-25 | 日本ゼオン株式会社 | ゴム架橋物 |
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JP2018053160A (ja) * | 2016-09-30 | 2018-04-05 | 西武ポリマ化成株式会社 | 親水性ゴム組成物およびこれを用いた搬送用ロール |
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JP2020049691A (ja) * | 2018-09-25 | 2020-04-02 | 日本ゼオン株式会社 | ゴム積層体およびホース |
JP7210962B2 (ja) | 2018-09-25 | 2023-01-24 | 日本ゼオン株式会社 | ゴム積層体およびホース |
Also Published As
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KR20130006474A (ko) | 2013-01-16 |
CN102947380B (zh) | 2015-06-17 |
JPWO2011115093A1 (ja) | 2013-06-27 |
KR101736712B1 (ko) | 2017-05-17 |
JP5742836B2 (ja) | 2015-07-01 |
EP2548919A4 (en) | 2013-08-14 |
BR112012021099A2 (pt) | 2016-05-17 |
BR112012021099B1 (pt) | 2019-12-17 |
CN102947380A (zh) | 2013-02-27 |
EP2548919A1 (en) | 2013-01-23 |
EP2548919B1 (en) | 2016-04-27 |
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