WO2016013486A1 - 耐熱コンベヤベルト用ゴム組成物および耐熱コンベヤベルト - Google Patents
耐熱コンベヤベルト用ゴム組成物および耐熱コンベヤベルト Download PDFInfo
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- WO2016013486A1 WO2016013486A1 PCT/JP2015/070411 JP2015070411W WO2016013486A1 WO 2016013486 A1 WO2016013486 A1 WO 2016013486A1 JP 2015070411 W JP2015070411 W JP 2015070411W WO 2016013486 A1 WO2016013486 A1 WO 2016013486A1
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- Prior art keywords
- heat
- ethylene
- resistant conveyor
- rubber composition
- conveyor belt
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 64
- 239000005060 rubber Substances 0.000 title claims abstract description 64
- 239000000203 mixture Substances 0.000 title claims abstract description 46
- 229920001577 copolymer Polymers 0.000 claims abstract description 53
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims abstract description 44
- 239000005977 Ethylene Substances 0.000 claims abstract description 44
- VXNZUUAINFGPBY-UHFFFAOYSA-N ethyl ethylene Natural products CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 claims description 23
- 150000001451 organic peroxides Chemical class 0.000 claims description 10
- 239000003431 cross linking reagent Substances 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 244000043261 Hevea brasiliensis Species 0.000 description 4
- 229920000459 Nitrile rubber Polymers 0.000 description 4
- 239000005062 Polybutadiene Substances 0.000 description 4
- 239000011162 core material Substances 0.000 description 4
- 229920003052 natural elastomer Polymers 0.000 description 4
- 229920001194 natural rubber Polymers 0.000 description 4
- 229920002857 polybutadiene Polymers 0.000 description 4
- 229920003048 styrene butadiene rubber Polymers 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 102100026891 Cystatin-B Human genes 0.000 description 3
- 101000912191 Homo sapiens Cystatin-B Proteins 0.000 description 3
- 208000033255 Progressive myoclonic epilepsy type 1 Diseases 0.000 description 3
- 235000021355 Stearic acid Nutrition 0.000 description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000003712 anti-aging effect Effects 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 3
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 239000008117 stearic acid Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000004594 Masterbatch (MB) Substances 0.000 description 2
- 239000002174 Styrene-butadiene Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- LSXWFXONGKSEMY-UHFFFAOYSA-N di-tert-butyl peroxide Chemical compound CC(C)(C)OOC(C)(C)C LSXWFXONGKSEMY-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000004014 plasticizer Substances 0.000 description 2
- 238000004073 vulcanization Methods 0.000 description 2
- 235000014692 zinc oxide Nutrition 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- UBRWPVTUQDJKCC-UHFFFAOYSA-N 1,3-bis(2-tert-butylperoxypropan-2-yl)benzene Chemical compound CC(C)(C)OOC(C)(C)C1=CC=CC(C(C)(C)OOC(C)(C)C)=C1 UBRWPVTUQDJKCC-UHFFFAOYSA-N 0.000 description 1
- DMWVYCCGCQPJEA-UHFFFAOYSA-N 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane Chemical compound CC(C)(C)OOC(C)(C)CCC(C)(C)OOC(C)(C)C DMWVYCCGCQPJEA-UHFFFAOYSA-N 0.000 description 1
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 1
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 229920002978 Vinylon Polymers 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 235000019241 carbon black Nutrition 0.000 description 1
- 208000018747 cerebellar ataxia with neuropathy and bilateral vestibular areflexia syndrome Diseases 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 239000002759 woven fabric 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
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
- B65G15/30—Belts or like endless load-carriers
- B65G15/32—Belts or like endless load-carriers made of rubber or plastics
- B65G15/34—Belts or like endless load-carriers made of rubber or plastics with reinforcing layers, e.g. of fabric
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
- B65G15/30—Belts or like endless load-carriers
- B65G15/32—Belts or like endless load-carriers made of rubber or plastics
- B65G15/34—Belts or like endless load-carriers made of rubber or plastics with reinforcing layers, e.g. of fabric
- B65G15/36—Belts or like endless load-carriers made of rubber or plastics with reinforcing layers, e.g. of fabric the layers incorporating ropes, chains, or rolled steel sections
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
- B65G15/30—Belts or like endless load-carriers
- B65G15/32—Belts or like endless load-carriers made of rubber or plastics
- B65G15/38—Belts or like endless load-carriers made of rubber or plastics with flame-resistant layers, e.g. of asbestos, glass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
- B65G15/30—Belts or like endless load-carriers
- B65G15/50—Endless load-carriers consisting of a series of parallel ropes or belt strips
- B65G15/52—Endless load-carriers consisting of a series of parallel ropes or belt strips interconnected by transverse slats
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F255/00—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00
- C08F255/02—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00 on to polymers of olefins having two or three carbon atoms
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F255/00—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00
- C08F255/02—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00 on to polymers of olefins having two or three carbon atoms
- C08F255/04—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00 on to polymers of olefins having two or three carbon atoms on to ethene-propene 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
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/14—Peroxides
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2500/00—Characteristics or properties of obtained polyolefins; Use thereof
- C08F2500/17—Viscosity
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
Definitions
- the present invention relates to a rubber composition for a heat-resistant conveyor belt and a heat-resistant conveyor belt.
- Patent Document 1 describes "a rubber composition for heat-resistant conveyor belts containing an ethylene / ⁇ -olefin copolymer having a melting point of 40 ° C or lower”.
- the content of the ethylene / propylene copolymer having an ethylene content of 60 to 80% by mass ” is described in the above [Claim 3]. It is an ethylene / 1-butene copolymer ”.
- the present invention has been made in view of the above points, and an object thereof is to provide a rubber composition for a heat-resistant conveyor belt that is excellent in heat resistance.
- the present inventors have increased the Mooney viscosity of the ethylene / 1-butene copolymer and reduced the ethylene content of the ethylene / propylene copolymer. The inventors have found that the heat resistance is improved and completed the present invention.
- the present invention provides the following (1) to (5).
- An ethylene / 1-butene copolymer having a Mooney viscosity at 125 ° C. of 20 or more and an ethylene / propylene copolymer having a Mooney viscosity at 125 ° C. of 20 or more and an ethylene content of 40 to 60% by mass A rubber composition for heat-resistant conveyor belts, wherein the mass ratio of the ethylene / 1-butene copolymer to the ethylene / propylene copolymer is 10/90 to 90/10.
- a numerical range represented by using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value.
- the rubber composition for heat-resistant conveyor belts of the present invention includes an ethylene / 1-butene copolymer having a Mooney viscosity of not less than 20 at 125 ° C. and 125 ° C.
- the rubber composition of this invention is excellent in heat resistance by employ
- the reason for this is not clear, but by using an ethylene / 1-butene copolymer having a high Mooney viscosity and an ethylene / propylene copolymer having a low ethylene content in combination, the physical properties after vulcanization (crosslinking) Is considered to be optimized.
- this mechanism is an estimation, and other mechanisms are also within the scope of the present invention.
- each component contained in the rubber composition of the present invention will be described.
- the rubber composition of the present invention contains an ethylene-1-butene copolymer (EBM) having a Mooney viscosity at 125 ° C. of 20 or more.
- EBM ethylene-1-butene copolymer
- the Mooney viscosity at 125 ° C. of the ethylene / 1-butene copolymer (EBM) is preferably 30 or more, and more preferably 40 or more, because the heat resistance is more excellent.
- an upper limit is not specifically limited, 70 or less is preferable and 55 or less is more preferable.
- the Mooney viscosity at 125 ° C. is a viscosity measured according to JIS K6300-1-2001 using an L-shaped rotor under conditions of a preheating time of 1 minute, a rotor rotation time of 4 minutes, and a test temperature of 125 ° C. ML1 + 4, 125 ° C.) (hereinafter the same).
- the ethylene content of the ethylene / 1-butene copolymer (EBM) is not particularly limited, but is preferably 60 to 90% by mass, more preferably 65 to 85% by mass.
- ethylene / 1-butene copolymer a commercially available product can be used. Specific examples thereof include an ethylene / 1-butene copolymer having a Mooney viscosity of 47 at 125 ° C. (trade name “ Enage 7487 ”) and the like. The Mooney viscosity at 125 ° C. of the ethylene / 1-butene copolymer (trade name “Engage 7467”) described in paragraph [0038] of Patent Document 1 is 19.
- the rubber composition of the present invention has a Mooney viscosity at 125 ° C. of 20 or more and an ethylene content of 40 to 60% by mass. Contains ethylene / propylene copolymer (EPM).
- the Mooney viscosity at 125 ° C. of the ethylene / propylene copolymer (EPM) is not particularly limited as long as it is 20 or more, but 25 or more is more preferable. In addition, although an upper limit is not specifically limited, 50 or less is preferable and 40 or less is more preferable.
- the ethylene content of the ethylene / propylene copolymer (EPM) is preferably 40% by mass or more and less than 60% by mass, and more preferably 45 to 55% by mass because heat resistance is more excellent.
- EPM ethylene / propylene copolymer
- a commercially available product can be used. Specific examples thereof include an ethylene / propylene copolymer having a Mooney viscosity of 26 at 125 ° C. and an ethylene content of 52% by mass.
- a polymer (trade name “KEP-110”) and the like.
- the Mooney viscosity at 125 ° C. of the ethylene / propylene copolymer (trade name “VISTALON 706”) described in paragraph [0038] of Patent Document 1 is 42, and the ethylene content is 65% by mass.
- the mass ratio (EBM / EPM) of the ethylene / 1-butene copolymer (EBM) to the ethylene / propylene copolymer (EPM) is 10/90 to 90/10, and 15/85 to 70 / 30 is preferable, and 20/80 to 50/50 is more preferable.
- the rubber composition of the present invention may further contain an organic peroxide as a crosslinking agent.
- the organic peroxide is not particularly limited, and conventionally known ones can be used. Specific examples thereof include dicumyl peroxide, di-t-butyl peroxide, 1,3-bis (t-butyl peroxide). Oxyisopropyl) benzene, 4,4′-di (t-butylperoxy) valeric acid n-butyl, 2,5-dimethyl-2,5-bis (t-butylperoxy) hexane, and the like. 1 type may be used independently and 2 or more types may be used together.
- the content of the organic peroxide is not particularly limited, but is 0.1% relative to a total of 100 parts by mass of the ethylene / 1-butene copolymer (EBM) and the ethylene / propylene copolymer (EPM). 007 to 0.024 molar equivalent is preferable, and 0.011 to 0.020 molar equivalent is more preferable.
- organic peroxide commercially available products can be used. Specific examples thereof include 1,3-bis (t-butylperoxyisopropyl) benzene (trade name “Perkadox 14-40”, Kayaku Akzo Etc.).
- the rubber composition of the present invention in addition to the above components, is generally used carbon black, zinc white, stearic acid, anti-aging agent, oil, plasticizer, as long as the object of the present invention is not impaired.
- Additives such as crosslinking agents other than organic peroxides can be contained. The content of these additives can be appropriately determined within a range that does not impair the object of the present invention.
- the rubber composition of the present invention can be produced by known conditions and methods.
- the rubber composition of the present invention can be produced by mixing the above-described components using a Banbury mixer, a kneader, a roll, or the like.
- the heat resistant conveyor belt of the present invention is a heat resistant conveyor belt using the rubber composition of the present invention. Its shape, manufacturing method, etc. are the same as those of a known heat-resistant conveyor belt. Specific examples of the heat resistant conveyor belt according to the present invention include the following.
- FIG. 1 is a cross-sectional view of an embodiment of the heat-resistant conveyor belt of the present invention.
- the canvas 1 is covered with a coat rubber (adhesive rubber) 2 to form a core material layer, and the outer periphery of the rubber composition of the present invention described above.
- a heat-resistant conveyor belt 4 covered with a cover rubber 3 made of The heat-resistant conveyor belt 4 in FIG. 1 has a canvas 1 made of a woven fabric of synthetic fibers such as nylon, vinylon, polyester, etc. as a core material.
- the thickness T 1 and T 2 of the cover rubber 3 is usually about 1.5 to 20 mm, although it is appropriately determined according to the purpose of use.
- the coat rubber 2 may be a coat rubber used in a known heat-resistant conveyor belt, such as natural rubber (NR), acrylonitrile-butadiene rubber (NBR), styrene-butadiene copolymer rubber (SBR), or butadiene rubber.
- NR natural rubber
- NBR acrylonitrile-butadiene rubber
- SBR styrene-butadiene copolymer rubber
- butadiene rubber a rubber composition containing (BR) or the like as a rubber component can be used.
- FIG. 2 is a cross-sectional view of another embodiment of the heat-resistant conveyor belt of the present invention.
- the steel cord 5 is covered with a cushion rubber (adhesive rubber) 6 to form a core material layer, and the outer periphery of the rubber of the present invention described above.
- the total thickness T of the heat-resistant conveyor belt 8 is about 10 to 50 mm.
- the cushion rubber 6 for example, an adhesive rubber that can be bonded to a galvanized steel cord used in a known steel conveyor belt can be used. Specifically, natural rubber (NR), acrylonitrile-butadiene rubber (NBR) can be used. ), Styrene-butadiene copolymer rubber (SBR), butadiene rubber (BR), etc., can be used as the rubber composition.
- Such a heat-resistant conveyor belt is obtained by interposing a canvas or steel cord as a core material between unvulcanized rubber sheets molded with the rubber composition of the present invention and vulcanizing by heating and pressurizing according to a conventional method. Easy to manufacture.
- the vulcanization conditions are usually around 120 to 180 ° C., about 0.1 to 4.9 MPa, and about 10 to 90 minutes.
- the heat-resistant conveyor belt of the present invention is excellent in heat resistance and the like because it uses the above-described rubber composition of the present invention.
- each component shown in the following Table 1 is blended in the composition shown in the following Table 1 (only the cross-linking agent 1 has a molar equivalent, and other components are parts by mass), and each rubber composition for heat-resistant conveyor belts (hereinafter, simply “rubber” A composition ”) was prepared. Specifically, first, the components shown in Table 1 below, except for the crosslinking agent 1 and the crosslinking agent 2, were kneaded for 5 minutes with a Banbury mixer (3.4 liters) and released when the temperature reached 160 ° C. Got a masterbatch. Next, the obtained master batch was kneaded with the crosslinking agent 1 and the crosslinking agent 2 with an open roll to obtain a rubber composition.
- T B (when hot) About the said vulcanized sheet, it carried out similarly to the above, and measured tensile strength (T B ) [MPa] in a 150 degreeC thermostat. If the value of T B (when hot) is 4.8 or more, it can be evaluated as having excellent heat resistance. The results are shown in Table 1 below.
- EBM1 An ethylene / 1-butene copolymer having a Mooney viscosity of 19 at 125 ° C. and an ethylene content of 74% by mass, trade name “Engage 7467” (manufactured by Dow Chemical Co., Ltd.)
- EBM 2 An ethylene / 1-butene copolymer having a Mooney viscosity of 47 at 125 ° C. and an ethylene content of 74% by mass, trade name “Engage 7487” (manufactured by Dow Chemical Co., Ltd.)
- EPM1 An ethylene / propylene copolymer having a Mooney viscosity of 26 at 125 ° C.
- Comparative Examples 1 to 4 using EBM 1 having a Mooney viscosity of 19 at 125 ° C. and EPM 2 having an ethylene content of 65% by mass have a value of T B (when hot) of 4.8. Since the value of ⁇ T B is less than ⁇ 70, the heat resistance is clearly inferior. Comparative Examples 1 to 4 correspond to Examples 2 to 5 in Patent Document 1.
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- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
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Abstract
Description
(1)125℃におけるムーニー粘度が20以上であるエチレン・1-ブテン共重合体と、125℃におけるムーニー粘度が20以上であり、エチレン含有量が40~60質量%であるエチレン・プロピレン共重合体と、を含有し、上記エチレン・1-ブテン共重合体と上記エチレン・プロピレン共重合体との質量比が、10/90~90/10である、耐熱コンベヤベルト用ゴム組成物。
(2)上記エチレン・1-ブテン共重合体の125℃におけるムーニー粘度が、30以上である、上記(1)に記載の耐熱コンベヤベルト用ゴム組成物。
(3)上記エチレン・プロピレン共重合体のエチレン含有量が、40質量%以上60質量%未満である、上記(1)または(2)に記載の耐熱コンベヤベルト用ゴム組成物。
(4)さらに有機過酸化物を含有し、上記有機過酸化物の含有量が、上記エチレン・1-ブテン共重合体と上記エチレン・プロピレン共重合体との合計100質量部に対して、0.011~0.020モル当量である、上記(1)~(3)のいずれかに記載の耐熱コンベヤベルト用ゴム組成物。
(5)請求項1~4のいずれか1項に記載の耐熱コンベヤベルト用ゴム組成物を用いる耐熱コンベヤベルト。
なお、本明細書において「~」を用いて表される数値範囲は、「~」の前後に記載される数値を下限値および上限値として含む範囲を意味する。
本発明の耐熱コンベヤベルト用ゴム組成物(以下、単に「本発明のゴム組成物」ともいう。)は、125℃におけるムーニー粘度が20以上であるエチレン・1-ブテン共重合体と、125℃におけるムーニー粘度が20以上であり、エチレン含有量が40~60質量%であるエチレン・プロピレン共重合体と、を含有し、上記エチレン・1-ブテン共重合体と上記エチレン・プロピレン共重合体との質量比が、10/90~90/10である、耐熱コンベヤベルト用ゴム組成物である。
この理由は明らかではないが、ムーニー粘度が高いエチレン・1-ブテン共重合体と、エチレン含有量が少ないエチレン・プロピレン共重合体とを併用することで、加硫(架橋)後の熱時物性が最適化されるためと考えられる。もっともこのメカニズムは推定であり、これ以外のメカニズムであっても本発明の範囲内とする。
以下、本発明のゴム組成物に含有される各成分について説明する。
本発明のゴム組成物は、125℃におけるムーニー粘度が20以上であるエチレン・1-ブテン共重合体(EBM)を含有する。
なお、特許文献1の段落[0038]に記載されているエチレン・1-ブテン共重合体(商品名「Engage 7467」)の125℃におけるムーニー粘度は19である。
本発明のゴム組成物は、上記エチレン・1-ブテン共重合体(EBM)のほかに、さらに、125℃におけるムーニー粘度が20以上であり、かつ、エチレン含有量が40~60質量%であるエチレン・プロピレン共重合体(EPM)を含有する。
なお、特許文献1の段落[0038]に記載されているエチレン・プロピレン共重合体(商品名「VISTALON 706」)の125℃におけるムーニー粘度は42であり、エチレン含有量は65質量%である。
上記エチレン・1-ブテン共重合体(EBM)と上記エチレン・プロピレン共重合体(EPM)との質量比(EBM/EPM)は、10/90~90/10であり、15/85~70/30が好ましく、20/80~50/50がより好ましい。
本発明のゴム組成物は、さらに、架橋剤として、有機過酸化物を含有してもよい。
上記有機過酸化物としては、特に限定されず、従来公知のものを使用でき、その具体例としては、ジクミルパーオキサイド、ジ-t-ブチルパーオキサイド、1,3-ビス(t-ブチルパーオキシイソプロピル)ベンゼン、4,4´-ジ(t-ブチルパーオキシ)バレリック酸n-ブチル、2,5-ジメチル-2,5-ビス(t-ブチルパーオキシ)ヘキサン等が挙げられ、これらを1種単独で用いてもよく、2種以上を併用してもよい。
上記有機過酸化物の含有量は、特に限定されないが、上記エチレン・1-ブテン共重合体(EBM)と上記エチレン・プロピレン共重合体(EPM)との合計100質量部に対して、0.007~0.024モル当量が好ましく、0.011~0.020モル当量がより好ましい。
本発明のゴム組成物は、上記各成分のほかに、本発明の目的を損なわない範囲で、一般的に用いられるカーボンブラック、亜鉛華、ステアリン酸、老化防止剤、オイル、可塑剤、上述した有機過酸化物以外の架橋剤等の添加剤を含有できる。これらの添加剤の含有量は、本発明の目的を損なわない範囲で適宜決めることができる。
次に、本発明の耐熱コンベヤベルトについて説明する。
本発明の耐熱コンベヤベルトは、本発明のゴム組成物を用いた耐熱コンベヤベルトである。その形状、製造方法等は公知の耐熱コンベヤベルトと同様である。
本発明の耐熱コンベヤベルトの具体的な構成としては、例えば、下記に示すようなものが挙げられる。
図1は、本発明の耐熱コンベヤベルトの一実施形態の断面図である。図1に示すように、本発明の耐熱コンベヤベルトの第1の実施形態は、帆布1をコートゴム(接着ゴム)2で被覆して芯材層とし、その外周を上述した本発明のゴム組成物からなるカバーゴム3でカバーした耐熱コンベヤベルト4である。
図1の耐熱コンベヤベルト4は、ナイロン、ビニロン、ポリエステル等の合成繊維の織布よりなる帆布1を芯材とするものであり、帆布1の積層枚数、カバーゴム3の厚さやベルト幅等は使用目的に応じて適宜決定されるが、カバーゴム3の厚さT1、T2は通常の場合、1.5~20mm程度とされる。
図2は、本発明の耐熱コンベヤベルトの他の一実施形態の断面図である。
図2に示すように、本発明の耐熱コンベヤベルトの第2の実施形態は、スチールコード5をクッションゴム(接着ゴム)6で被覆して芯材層とし、その外周を上述した本発明のゴム組成物からなるカバーゴム7でカバーした耐熱コンベヤベルト8である。
図2の耐熱コンベヤベルト8は、直径0.2~0.4mm程度の素線を複数本撚り合わせて直径2.0~9.5mm程度のスチールコード5を50~230本程度並列させて芯材とするものであり、一般に、耐熱コンベヤベルト8の総厚みTは10~50mm程度とされる。
また、クッションゴム6は、例えば、公知のスチールコンベヤベルトに用いられている亜鉛メッキスチールコードに接着可能な接着ゴムを使用でき、具体的には、天然ゴム(NR)、アクリロニトリル-ブタジエンゴム(NBR)、スチレン-ブタジエン共重合体ゴム(SBR)、ブタジエンゴム(BR)等をゴム成分とするゴム組成物が使用できる。
下記第1表に示す各成分を、下記第1表に示す組成(架橋剤1のみモル当量、その他の成分は質量部)で配合し、各耐熱コンベヤベルト用ゴム組成物(以下、単に「ゴム組成物」という)を調製した。
具体的には、まず、下記第1表に示す成分のうち架橋剤1および架橋剤2を除く成分をバンバリーミキサー(3.4リットル)で5分間混練し、160℃に達したときに放出し、マスターバッチを得た。次に、得られたマスターバッチに架橋剤1および架橋剤2をオープンロールで混練し、ゴム組成物を得た。
得られた各ゴム組成物を150℃のプレス成型機を用い、面圧3.0MPaの圧力下で45分間加硫して、2mm厚の加硫シートを作製した。このシートからJIS3号ダンベル状の試験片を打ち抜き、引張速度500mm/分での引張試験をJIS K6251:2010に準拠して行い、引張強さ(TB)[MPa]を室温にて測定した。結果を下記第1表に示す。
上記加硫シートついて、上記と同様にして、引張強さ(TB)[MPa]を150℃の恒温槽にて測定した。TB(熱時)の値が4.8以上であれば、耐熱性に優れるものとして評価できる。結果を下記第1表に示す。
室温での引張強さ(TB(常態))と150℃での引張強さ(TB(熱時))との変化率(ΔTB)[%]を求めた。ΔTBの値が-70以上であれば、耐熱性に優れるものとして評価できる。結果を下記第1表に示す。
変化率(ΔTB)={(TB(熱時)-TB(常態))/TB(常態)}×100
・EBM1:125℃におけるムーニー粘度が19であり、エチレン含有量が74質量%であるエチレン・1-ブテン共重合体、商品名「Engage 7467」(ダウケミカル社製)
・EBM2:125℃におけるムーニー粘度が47であり、エチレン含有量が74質量%であるエチレン・1-ブテン共重合体、商品名「Engage 7487」(ダウケミカル社製)
・EPM1:125℃におけるムーニー粘度が26であり、エチレン含有量が52質量%であるエチレン・プロピレン共重合体、商品名「KEP-110」(KUMHO POLYCHEM社製)
・EPM2:125℃におけるムーニー粘度が42であり、エチレン含有量が65質量%であるエチレン・プロピレン共重合体、商品名「VISTALON 706」(Exxon Mobil Chemical社製)
・亜鉛華:商品名「酸化亜鉛3種」(正同化学工業社製)
・ステアリン酸:商品名「ステアリン酸50S」(千葉脂肪酸社製)
・老化防止剤1:商品名「ノクラックMMB」(大内新興化学工業社製)
・老化防止剤2:商品名「ノンフレックスLAS-P」(精工化学社製)
・オイル:商品名「SUNPAR 2280」(日本サン石油社製)
・可塑剤:商品名「ルーカント HC-3000X」(三井化学社製)
・架橋剤1:商品名「パーカドックス14-40」(化薬アクゾ社製)
・架橋剤2:商品名「ハイクロスGT」(精工化学社製)
2:コートゴム
3,7:カバーゴム
4,8:耐熱コンベヤベルト
5:スチールコード
6:クッションゴム
Claims (5)
- 125℃におけるムーニー粘度が20以上であるエチレン・1-ブテン共重合体と、
125℃におけるムーニー粘度が20以上であり、エチレン含有量が40~60質量%であるエチレン・プロピレン共重合体と、を含有し、
前記エチレン・1-ブテン共重合体と前記エチレン・プロピレン共重合体との質量比が、10/90~90/10である、耐熱コンベヤベルト用ゴム組成物。 - 前記エチレン・1-ブテン共重合体の125℃におけるムーニー粘度が、30以上である、請求項1に記載の耐熱コンベヤベルト用ゴム組成物。
- 前記エチレン・プロピレン共重合体のエチレン含有量が、40質量%以上60質量%未満である、請求項1または2に記載の耐熱コンベヤベルト用ゴム組成物。
- さらに有機過酸化物を含有し、
前記有機過酸化物の含有量が、前記エチレン・1-ブテン共重合体と前記エチレン・プロピレン共重合体との合計100質量部に対して、0.011~0.020モル当量である、請求項1~3のいずれか1項に記載の耐熱コンベヤベルト用ゴム組成物。 - 請求項1~4のいずれか1項に記載の耐熱コンベヤベルト用ゴム組成物を用いる耐熱コンベヤベルト。
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