CN111621066A - Rubber composition for bonding steel cord and conveyor belt - Google Patents
Rubber composition for bonding steel cord and conveyor belt Download PDFInfo
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- CN111621066A CN111621066A CN202010101142.2A CN202010101142A CN111621066A CN 111621066 A CN111621066 A CN 111621066A CN 202010101142 A CN202010101142 A CN 202010101142A CN 111621066 A CN111621066 A CN 111621066A
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- rubber
- mass
- steel cord
- parts
- rubber composition
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 164
- 239000005060 rubber Substances 0.000 title claims abstract description 164
- 239000000203 mixture Substances 0.000 title claims abstract description 93
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 81
- 239000010959 steel Substances 0.000 title claims abstract description 81
- YJEUJARPQSLENW-UHFFFAOYSA-M B([O-])([O-])[O-].C(CCCCCC(C)(C)C)(=O)[O-].[Co+4] Chemical compound B([O-])([O-])[O-].C(CCCCCC(C)(C)C)(=O)[O-].[Co+4] YJEUJARPQSLENW-UHFFFAOYSA-M 0.000 claims abstract description 26
- 229920002857 polybutadiene Polymers 0.000 claims abstract description 24
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 claims description 45
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims description 45
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims description 45
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 28
- 238000004073 vulcanization Methods 0.000 claims description 27
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 26
- 239000006229 carbon black Substances 0.000 claims description 22
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 18
- 229910052717 sulfur Inorganic materials 0.000 claims description 18
- 239000011593 sulfur Substances 0.000 claims description 18
- 244000043261 Hevea brasiliensis Species 0.000 claims description 17
- 229920003052 natural elastomer Polymers 0.000 claims description 17
- 229920001194 natural rubber Polymers 0.000 claims description 17
- 239000005011 phenolic resin Substances 0.000 claims description 16
- 239000011787 zinc oxide Substances 0.000 claims description 13
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 9
- 239000008397 galvanized steel Substances 0.000 claims description 9
- FZWLAAWBMGSTSO-UHFFFAOYSA-N Thiazole Chemical group C1=CSC=N1 FZWLAAWBMGSTSO-UHFFFAOYSA-N 0.000 claims description 5
- 239000000654 additive Substances 0.000 claims description 3
- 230000000996 additive effect Effects 0.000 claims 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 19
- 230000000694 effects Effects 0.000 description 33
- 238000012360 testing method Methods 0.000 description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- 239000012188 paraffin wax Substances 0.000 description 12
- 239000004636 vulcanized rubber Substances 0.000 description 12
- 239000011248 coating agent Substances 0.000 description 11
- 238000000576 coating method Methods 0.000 description 11
- 230000009477 glass transition Effects 0.000 description 11
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 10
- 239000003921 oil Substances 0.000 description 10
- 239000000126 substance Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 8
- 238000011156 evaluation Methods 0.000 description 8
- GEMHFKXPOCTAIP-UHFFFAOYSA-N n,n-dimethyl-n'-phenylcarbamimidoyl chloride Chemical compound CN(C)C(Cl)=NC1=CC=CC=C1 GEMHFKXPOCTAIP-UHFFFAOYSA-N 0.000 description 8
- 239000005062 Polybutadiene Substances 0.000 description 7
- 230000014759 maintenance of location Effects 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 238000001179 sorption measurement Methods 0.000 description 6
- 239000010941 cobalt Substances 0.000 description 5
- 229910017052 cobalt Inorganic materials 0.000 description 5
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 5
- 239000002131 composite material Substances 0.000 description 5
- 229920002554 vinyl polymer Polymers 0.000 description 5
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 4
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 4
- 229920000459 Nitrile rubber Polymers 0.000 description 4
- 239000000460 chlorine Substances 0.000 description 4
- 229910052801 chlorine Inorganic materials 0.000 description 4
- 238000005227 gel permeation chromatography Methods 0.000 description 4
- 238000013101 initial test Methods 0.000 description 4
- 229920001568 phenolic resin Polymers 0.000 description 4
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 4
- 235000021355 Stearic acid Nutrition 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000010073 coating (rubber) Methods 0.000 description 3
- 150000001868 cobalt Chemical class 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000465 moulding Methods 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
- 239000002904 solvent Substances 0.000 description 3
- 239000008117 stearic acid Substances 0.000 description 3
- 239000002023 wood Substances 0.000 description 3
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 description 2
- 239000005662 Paraffin oil Substances 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- 239000002174 Styrene-butadiene Substances 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- 150000001299 aldehydes Chemical class 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 229920005549 butyl rubber Polymers 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- AFZSMODLJJCVPP-UHFFFAOYSA-N dibenzothiazol-2-yl disulfide Chemical compound C1=CC=C2SC(SSC=3SC4=CC=CC=C4N=3)=NC2=C1 AFZSMODLJJCVPP-UHFFFAOYSA-N 0.000 description 2
- 229920003244 diene elastomer Polymers 0.000 description 2
- HYBBIBNJHNGZAN-UHFFFAOYSA-N furfural Chemical compound O=CC1=CC=CO1 HYBBIBNJHNGZAN-UHFFFAOYSA-N 0.000 description 2
- 229920003049 isoprene rubber Polymers 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229920001084 poly(chloroprene) Polymers 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- GHMLBKRAJCXXBS-UHFFFAOYSA-N resorcinol Chemical compound OC1=CC=CC(O)=C1 GHMLBKRAJCXXBS-UHFFFAOYSA-N 0.000 description 2
- 239000003784 tall oil Substances 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 238000005160 1H NMR spectroscopy Methods 0.000 description 1
- QTWJRLJHJPIABL-UHFFFAOYSA-N 2-methylphenol;3-methylphenol;4-methylphenol Chemical compound CC1=CC=C(O)C=C1.CC1=CC=CC(O)=C1.CC1=CC=CC=C1O QTWJRLJHJPIABL-UHFFFAOYSA-N 0.000 description 1
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 1
- 229920003261 Durez Polymers 0.000 description 1
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- RSWGJHLUYNHPMX-ONCXSQPRSA-N abietic acid Chemical compound C([C@@H]12)CC(C(C)C)=CC1=CC[C@@H]1[C@]2(C)CCC[C@@]1(C)C(O)=O RSWGJHLUYNHPMX-ONCXSQPRSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- IKHGUXGNUITLKF-XPULMUKRSA-N acetaldehyde Chemical compound [14CH]([14CH3])=O IKHGUXGNUITLKF-XPULMUKRSA-N 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000010692 aromatic oil Substances 0.000 description 1
- 235000013871 bee wax Nutrition 0.000 description 1
- 239000012166 beeswax Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 125000001309 chloro group Chemical group Cl* 0.000 description 1
- 229930003836 cresol Natural products 0.000 description 1
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000009661 fatigue test Methods 0.000 description 1
- 229920005555 halobutyl Polymers 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 239000000025 natural resin Substances 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 150000004045 organic chlorine compounds Chemical class 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000007586 pull-out test Methods 0.000 description 1
- 229930195734 saturated hydrocarbon Natural products 0.000 description 1
- 238000003860 storage Methods 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
- 238000009864 tensile test Methods 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- KUAZQDVKQLNFPE-UHFFFAOYSA-N thiram Chemical compound CN(C)C(=S)SSC(=S)N(C)C KUAZQDVKQLNFPE-UHFFFAOYSA-N 0.000 description 1
- 229960002447 thiram Drugs 0.000 description 1
- 150000003739 xylenols Chemical class 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L7/00—Compositions of natural rubber
-
- 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
-
- 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
- C08L9/06—Copolymers with styrene
-
- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- 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)
- Belt Conveyors (AREA)
Abstract
The invention provides a rubber composition for bonding a steel cord, which has excellent cold resistance, durability and water-resistant bonding property, and a conveyor belt. A rubber composition for bonding a steel cord, which contains a rubber component containing at least polybutadiene rubber and cobalt neodecanoate borate, and a conveyor belt formed by using the rubber composition for bonding a steel cord.
Description
Technical Field
The present invention relates to a rubber composition for bonding a steel cord and a conveyor belt.
Background
Conventionally, various rubber compositions have been proposed for the purpose of improving adhesion performance to a steel cord.
For example, patent document 1 proposes a rubber composition in which 40 to 80 parts by mass of carbon black, cobalt neodecanoate borate, a phenolic resin, and a curing agent are added to 100 parts by mass of a diene rubber containing a natural rubber, wherein the carbon black has a DBP oil absorption of 50 × 10-5～80×10-5m3The iodine adsorption amount is 100 to 150g/kg, the dynamic storage modulus (E') at 20 ℃ under a dynamic strain of 2% is 8MPa or more, the loss tangent (tan) at 60 ℃ is 0.20 or less, and the number of repetitions until failure in a constant strain fatigue test at 400rpm under a strain of 60% is 45000 or more.
Further, patent document 2 discloses a method for bonding a galvanized steel cord to a rubber, which comprises bonding a rubber composition to a galvanized steel cord, the rubber composition containing, per 100 parts by weight of a sulfur-vulcanizable rubber: 3 to 15 parts by weight of rosin or rosin derivatives, 0.2 to 1.0 part by weight of organic cobalt salt based on the amount of cobalt, and 3 to 50 parts by weight of organic chlorine compounds.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2018-131522
Patent document 2: japanese patent No. 4449941
Disclosure of Invention
Problems to be solved by the invention
On the other hand, when a conveyor belt incorporating a steel cord is used in cold regions, the rubber composition used for the coating rubber layer (cushion rubber) coating the steel cord is required to have cold resistance in addition to adhesion to the steel cord in the conveyor belt.
Under such a background, the present inventors have made reference to patent document 1 and the like to prepare a rubber composition and have evaluated it, and as a result, it is obvious that: such a composition has poor cold resistance and is difficult to achieve both durability and water-resistant adhesion (comparative examples 2 to 4).
Accordingly, an object of the present invention is to provide a rubber composition for bonding a steel cord, which is excellent in cold resistance, durability and water-resistant adhesion. In the present invention, the water-resistant adhesion includes moisture-resistant adhesion.
Another object of the present invention is to provide a conveyor belt having excellent cold resistance, durability, and water-resistant adhesion.
Technical scheme
The present inventors have conducted extensive studies to solve the above-mentioned problems, and as a result, have found that the desired effects can be obtained when a rubber composition contains a rubber component containing at least a polybutadiene rubber and cobalt neodecanoate borate.
The present invention has been made based on the above-described findings, and specifically, the above-described problems are solved by the following configurations.
[1] A rubber composition for bonding a steel cord, which contains a rubber component containing at least polybutadiene rubber and cobalt neodecanoate borate.
[2] The rubber composition for bonding a steel cord according to [1], wherein the rubber component further comprises a natural rubber and/or a styrene butadiene copolymer rubber.
[3] The rubber composition for bonding a steel cord according to [1] or [2], wherein the polybutadiene rubber is contained in an amount of 15 to 60 parts by mass per 100 parts by mass of the rubber component.
[4] The rubber composition for bonding a steel cord according to any one of [1] to [3], further comprising carbon black, wherein the content of the carbon black is 35 to 75 parts by mass with respect to 100 parts by mass of the rubber component.
[5] The rubber composition for bonding a steel cord according to any one of [1] to [4], wherein the content of the cobalt neodecanoate borate is 1.2 to 3.5 parts by mass per 100 parts by mass of the rubber component.
[6] The rubber composition for bonding a steel cord according to any one of [1] to [5], further comprising a vulcanization accelerator, wherein the vulcanization accelerator is a thiazole-based vulcanization accelerator.
[7] The rubber composition for bonding a steel cord according to [6], wherein the vulcanization accelerator is contained in an amount of 0.3 to 1.2 parts by mass per 100 parts by mass of the rubber component.
[8] The rubber composition for bonding a steel cord according to any one of [1] to [7], further comprising sulfur in an amount of 2.1 to 5.0 parts by mass per 100 parts by mass of the rubber component.
[9] The rubber composition for bonding a steel cord according to any one of [1] to [8], further comprising at least one selected from the group consisting of rosin, rosin derivatives, phenol resins, and chlorinated paraffins.
[10] The rubber composition for bonding a steel cord according to any one of [1] to [9], further comprising zinc oxide, wherein the content of zinc oxide is 5.0 parts by mass or more per 100 parts by mass of the rubber component.
[11] The rubber composition for bonding a steel cord according to any one of [1] to [10], further comprising an oil, wherein the oil is contained in an amount of 2.0 parts by mass or more per 100 parts by mass of the rubber component.
[12] The rubber composition for bonding a steel cord according to any one of [1] to [11], which is used for bonding a galvanized steel cord.
[13] A conveyor belt formed by using the rubber composition for bonding steel cords according to any one of [1] to [12 ].
Advantageous effects
The rubber composition for bonding a steel cord of the present invention is excellent in cold resistance, durability and water-resistant adhesion.
The conveyor belt of the present invention is excellent in cold resistance, durability, and water-resistant adhesion.
Drawings
FIG. 1 is a cross-sectional perspective view schematically illustrating one example of the conveyor belt of the present invention.
Detailed Description
The present invention will be described in detail below.
The numerical range expressed by the term "to" in the present specification means a range including numerical values described before and after the term "to" as a lower limit value and an upper limit value.
In the present specification, unless otherwise specified, each component may be used alone or in combination of two or more kinds thereof. When the component contains two or more substances, the content of the component refers to the total content of the two or more substances.
In the present specification, the method for producing each component is not particularly limited as long as it is not described in advance. For example, a conventionally known method can be cited.
In the present specification, the more excellent at least one of the cold resistance, the durability and the water-resistant adhesion may be referred to as the more excellent effect of the present invention.
[ rubber composition for adhesion of Steel cord ]
The rubber composition for bonding a steel cord of the present invention (the composition of the present invention) is a rubber composition for bonding a steel cord containing a rubber component containing at least polybutadiene rubber and cobalt borate neodecanoate.
It can be considered that: the composition of the present invention has such a constitution, and therefore, a desired effect can be obtained. Although the reason for this is not clear, it is estimated that the reason is as follows.
The composition of the present invention contains polybutadiene rubber as a rubber component, and thus can set the embrittlement temperature to a preferable range and is excellent in cold resistance.
Further, the present inventors have found that: when cobalt naphthenate is used as the organic cobalt salt, there is a problem that the retention of elongation at break (EB) of the rubber in an over-vulcanized state is low, and the durability of the conveyor belt is lowered.
Here, the above-mentioned overcuring means that the rubber is further vulcanized after a usual vulcanization time (after initial vulcanization) required for producing a product. Specific examples of the above-mentioned further vulcanization include: a case where the vulcanization time in vulcanizing unvulcanized rubber is longer than usual; the case where the vulcanized rubber or the like is further vulcanized when the vulcanized rubber or the conveyor belt is repaired; a case where the vulcanized rubber is further vulcanized and cyclized; and the like.
With respect to the above problems, the present inventors have found that: in the case of using cobalt neodecanoate borate as the organic cobalt salt, the water resistant adhesion can be maintained or improved, and the durability of the conveyor belt can be improved.
The present inventors speculate that: when the amount of cobalt contained in the cobalt neodecanoate borate or the cobalt naphthenate is equal, the cobalt neodecanoate borate contains less organic acid than the cobalt naphthenate, and therefore, the reduction in elongation at break (EB) after overcuring can be reduced.
As described above, the composition of the present invention contains cobalt neodecanoate borate, and thus can achieve both durability and water-resistant adhesion at an excellent level.
As described above, the composition of the present invention is excellent in cold resistance, durability and water-resistant adhesion.
Hereinafter, each component contained in the composition of the present invention will be described in detail.
< rubber component >
The composition of the present invention contains a rubber component containing at least polybutadiene rubber.
< polybutadiene rubber >
The polybutadiene rubber (butadiene rubber, also referred to as "BR") contained in the composition of the present invention is not particularly limited as long as it is a homopolymer of butadiene. The polybutadiene rubber may be modified.
(weight average molecular weight of polybutadiene rubber)
From the viewpoint of further improving the effect of the present invention and increasing the drawing force (force required for drawing the steel cord from the rubber), the weight average molecular weight of the polybutadiene rubber is preferably 40 to 100 ten thousand, and more preferably 45 to 80 ten thousand.
In the present invention, the weight average molecular weight of the polybutadiene rubber is a standard polystyrene equivalent value based on a measurement value obtained by Gel Permeation Chromatography (GPC) using cyclohexane as a solvent.
(glass transition temperature of polybutadiene rubber)
From the viewpoint of more excellent effects (particularly, cold resistance) of the present invention, the glass transition temperature of the polybutadiene rubber is preferably-50 ℃ or lower, more preferably-150 to-80 ℃.
In the present invention, the glass transition temperature may be set to the following value: in a method according to JIS K7121: 2012, the curve obtained when the change in the heat flow rate was measured at a temperature rise of 20 ℃/min using a differential thermal analyzer, and the value obtained at the inflection point was read.
From the viewpoint that the effect (particularly cold resistance) of the present invention is more excellent, and that the rubber after initial vulcanization is further crosslinked by overcuring so that the rubber is not excessively hard and the embrittlement temperature can be set to an appropriate range, the content of the polybutadiene rubber is preferably 15 to 60 parts by mass, more preferably 20 to 50 parts by mass, further preferably more than 20 parts by mass and 50 parts by mass or less, and particularly preferably 25 to 45 parts by mass with respect to 100 parts by mass of the rubber component.
(rubber other than BR)
The rubber component may contain other rubbers in addition to BR.
Examples of the rubber other than BR include: diene rubbers such as natural rubber, Isoprene Rubber (IR), aromatic vinyl-conjugated diene copolymer rubber (e.g., styrene butadiene copolymer rubber), acrylonitrile butadiene rubber (NBR), butyl rubber (IIR), halogenated butyl rubber, and Chloroprene Rubber (CR).
From the viewpoint of more excellent effects of the present invention, the rubber component preferably further contains natural rubber and/or styrene butadiene copolymer rubber, and more preferably contains natural rubber and styrene butadiene copolymer rubber.
Natural rubber
The Natural Rubber (NR) is not particularly limited. For example, conventionally known natural rubber can be cited.
Styrene butadiene copolymer rubber
The styrene-butadiene copolymer rubber is not particularly limited as long as it is a copolymer of styrene and butadiene.
(bound styrene amount of styrene butadiene copolymer rubber)
From the viewpoint of further improving the effect (particularly, cold resistance) of the present invention and lowering the glass transition temperature of the styrene-butadiene copolymer rubber described later, the amount of bound styrene in the styrene-butadiene copolymer rubber is preferably 5 to 40% by mass, and more preferably 10 to 30% by mass, based on the total amount of the styrene-butadiene copolymer rubber.
(vinyl amount of styrene butadiene copolymer rubber)
From the viewpoint of further improving the effect (particularly, cold resistance) of the present invention and lowering the glass transition temperature of the styrene-butadiene copolymer rubber described later, the vinyl content (1, 2-vinyl bond content) of butadiene in the styrene-butadiene copolymer rubber is preferably 5 to 30% by mass, more preferably 5 to 20% by mass, based on the total amount of butadiene repeating units in the styrene-butadiene copolymer rubber.
In the present invention, the amount of the bound styrene and the amount of the vinyl group in the styrene-butadiene copolymer rubber may be determined by1H-NMR was measured.
(glass transition temperature of styrene butadiene copolymer rubber)
From the viewpoint of further improving the effect (particularly, cold resistance) of the present invention, the glass transition temperature of the styrene-butadiene copolymer rubber is preferably-50 ℃ or lower.
The lower limit of the glass transition temperature of the styrene-butadiene copolymer rubber may be set to, for example, -100 ℃ or higher.
The method for measuring the glass transition temperature of the styrene-butadiene copolymer rubber is the same as described above.
(weight average molecular weight of styrene butadiene copolymer rubber)
The weight average molecular weight of the styrene butadiene copolymer rubber is not particularly limited. For example, 20 to 300 ten thousand may be used.
In the present invention, the weight average molecular weight of the styrene butadiene copolymer rubber is a standard polystyrene equivalent value based on a measurement value obtained by Gel Permeation Chromatography (GPC) using tetrahydrofuran as a solvent.
In the case where the rubber component contains the natural rubber and the styrene-butadiene copolymer rubber in addition to BR (in combination of three components), the content of the natural rubber is preferably 20 to 42.5 parts by mass, more preferably 25 to 40 parts by mass, per 100 parts by mass of the rubber component, from the viewpoint that the effect of the present invention is more excellent and the embrittlement temperature can be set to an appropriate range.
In the case of using the three components in combination, the content of the styrene-butadiene copolymer rubber is preferably 20 to 42.5 parts by mass, more preferably 25 to 40 parts by mass, per 100 parts by mass of the rubber component, from the viewpoint that the effect of the present invention is more excellent and the embrittlement temperature can be set to an appropriate range.
< cobalt neodecanoate borate >
The cobalt neodecanoate borate contained in the composition of the present invention is a compound represented by the following formula (1).
The composition of the present invention contains cobalt neodecanoate borate, and thus has excellent adhesion to a steel cord.
[ chemical formula 1]
(content of cobalt borate neodecanoate)
From the viewpoint that the effect of the present invention is more excellent, the adhesion to a steel cord is excellent, and the rubber after initial vulcanization is not too hard due to further crosslinking by overcuring, the content of the cobalt neodecanoate borate is preferably 1.2 to 3.5 parts by mass, more preferably more than 1.5 parts by mass and 2.5 parts by mass or less, per 100 parts by mass of the rubber component.
(carbon Black)
The compositions of the present invention may also contain carbon black.
The carbon black is not particularly limited.
Among these, the carbon black is preferably an HAF-grade carbon black or an ISAF-grade carbon black, and more preferably an HAF-grade carbon black, from the viewpoint of further improving the effects of the present invention.
(nitrogen adsorption specific surface area of carbon Black)
From the viewpoint of further improving the effect of the present invention, the nitrogen adsorption specific surface area (N) of the carbon black is2SA) is preferably 60 to 120m2A concentration of 65 to 95m is more preferable2/g。
The nitrogen adsorption specific surface area of carbon black can be determined in accordance with JIS K6217-2: 2017 "second part: the method for solving the specific surface area, nitrogen adsorption method, single-point method "measures the amount of nitrogen adsorbed on the surface of carbon black.
(content of carbon Black)
From the viewpoint of further improving the effect of the present invention, the content of the carbon black is preferably 35 to 75 parts by mass, more preferably 40 to 70 parts by mass, based on 100 parts by mass of the rubber component.
(vulcanization accelerators)
The composition of the present invention may further contain a vulcanization accelerator.
The vulcanization accelerator is not particularly limited. Examples thereof include a thiazole-based, guanidine-based, thiuram-based or sulfenamide-based vulcanization accelerator.
Among them, the vulcanization accelerator is preferably a thiazole-based vulcanization accelerator, and more preferably dibenzothiazyl disulfide, from the viewpoint that the effect of the present invention is more excellent and further crosslinking of the rubber is not easily promoted after vulcanization.
(content of vulcanization accelerator)
From the viewpoint of more excellent effects of the present invention, the content of the vulcanization accelerator is preferably 0.3 to 1.2 parts by mass, more preferably 0.3 part by mass or more and less than 1.0 part by mass, and still more preferably 0.4 to 0.9 part by mass, relative to 100 parts by mass of the rubber component.
(Sulfur)
The composition of the present invention may also contain sulfur. The sulfur is not particularly limited.
(content of Sulfur)
From the viewpoint of more excellent effects (particularly water-resistant adhesion) of the present invention, the content of sulfur is preferably 2.1 to 5.0 parts by mass, more preferably 2.5 to 4.0 parts by mass, per 100 parts by mass of the rubber component.
The lower limit of the sulfur content may be 2.0 parts by mass or more per 100 parts by mass of the rubber component.
(cobalt borate neodecanoate/sulfur mass ratio)
In the case where the composition of the present invention further contains sulfur, the mass ratio of the content of the cobalt neodecanoate borate to the content of the sulfur (cobalt neodecanoate borate/sulfur) is preferably from 0.24(1.2/5) to 1.7(3.5/2.1), more preferably from more than 0.50 to 1.0 or less, and further preferably from 0.55 to 0.80, from the viewpoint of more excellent effects of the present invention and excellent adhesion to a steel cord.
(rosin, etc.)
From the viewpoint of more excellent effects of the present invention and excellent adhesion to a steel cord, the composition of the present invention preferably further contains at least one selected from the group consisting of rosin, rosin derivatives, phenol resins, and chlorinated paraffins, and more preferably, rosin or rosin derivatives, phenol resins, and chlorinated paraffins are used in combination.
In the present specification, rosin derivatives, phenol resins, and chlorinated paraffins may be collectively referred to as "rosin and the like" hereinafter.
The rosin and the like can function as an adhesion imparting agent.
Rosin, rosin derivatives
Rosin is one of the natural resins also known as rosin.
Examples of the rosin derivatives include: gum rosin (gum rosin), wood rosin, tall oil rosin, a polymer of these rosins, disproportionated rosin, maleated rosin, aldehyde-modified rosin, hydrogenated rosin, and processed products thereof, which are extracted from pine wood with a solvent or the like.
Rosin and rosin derivatives which are generally used as tackifiers can be used.
As the rosin or rosin derivative, a commercially available product can be used. Specifically, examples thereof include: gum rosin or wood rosin manufactured by kazama chemical industries, tall oil rosin manufactured by harmomax chemical industries, hydrogenated rosin manufactured by Hercules, and the like.
From the viewpoint of further improving the effects of the present invention and excellent adhesion to a steel cord, the rosin content is preferably 3 to 10 parts by mass per 100 parts by mass of the rubber component. The content of the rosin derivative is also the same as that of the above rosin.
Phenol formaldehyde resin
As the phenol resin, a phenol resin which can be usually blended in a rubber composition can be used. The phenol resin may include a resin obtained by a reaction between a phenol and an aldehyde, and a modified product thereof. Examples of the phenols include phenol, cresol, xylenol, and resorcinol. Examples of the aldehyde include formaldehyde, acetaldehyde, and furfural.
In a preferred embodiment, the composition of the present invention does not contain a curing agent for a phenolic resin.
From the viewpoint of further improving the effects of the present invention and excellent adhesion to a steel cord, the content of the phenolic resin is preferably 2 to 8 parts by mass per 100 parts by mass of the rubber component.
Chlorinated paraffin
The chlorinated paraffin is not particularly limited as long as it is a paraffin having chlorine. For example, a chain-like saturated hydrocarbon compound having an average carbon number of 26 is mentioned, and all or a part of hydrogen atoms in the compound is substituted by chlorine atoms.
The amount of chlorine contained in the chlorinated paraffin is preferably 40 to 80% by mass, for example, based on the total amount of the chlorinated paraffin.
From the viewpoint of further improving the effect of the present invention and excellent adhesion to a steel cord, the content of the chlorinated paraffin is preferably 3 to 8 parts by mass with respect to 100 parts by mass of the rubber component.
(Total content in the case of combination)
When rosin or a rosin derivative, a phenol resin, and chlorinated paraffin are used in combination, the total content thereof is preferably 8 to 22 parts by mass per 100 parts by mass of the rubber component, from the viewpoint of further improving the effect of the present invention and improving the adhesion to a steel cord.
When rosin or a rosin derivative, a phenol resin, and chlorinated paraffin are used in combination, the content of the phenol resin is preferably 10 to 40% by mass based on the total content of the rosin or the rosin derivative, the phenol resin, and the chlorinated paraffin, from the viewpoint of further improving the effect of the present invention and improving the adhesion to a steel cord.
(Zinc oxide)
The composition of the invention may also contain zinc oxide. The zinc oxide is not particularly limited.
(content of Zinc oxide)
From the viewpoint of further improving the effect of the present invention, the content of the zinc oxide is preferably 5.0 parts by mass or more per 100 parts by mass of the rubber component.
The upper limit of the content of the zinc oxide may be 20 parts by mass or less with respect to 100 parts by mass of the rubber component.
(oil)
The compositions of the present invention may also contain an oil. The above oil is not particularly limited. Examples thereof include paraffin oil (excluding chlorinated paraffin) and aromatic oil.
(oil content)
From the viewpoint of further improving the effect of the present invention, the content of the oil is preferably 2.0 parts by mass or more per 100 parts by mass of the rubber component.
The upper limit of the oil content may be 10 parts by mass or less with respect to 100 parts by mass of the rubber component.
The composition of the present invention may contain, if necessary, additives such as stearic acid and an antioxidant in addition to the above-mentioned essential components within a range not impairing the object of the present invention.
The composition of the present invention can be produced by mixing the above-mentioned essential components, and if necessary, the above-mentioned carbon black and the like using a roll mill or a banbury mixer.
The composition of the present invention can be used for bonding a steel cord (specifically, for example, a galvanized steel cord), for example.
The composition of the present invention is used, for example, vulcanized, together with a steel cord (for example, a galvanized steel cord), whereby a composite body having a vulcanized rubber and a steel cord can be obtained. In the above composite, the vulcanized rubber and the steel cord can be bonded.
Examples of the steel cord include: a steel cord having an untreated surface; a steel cord having a galvanized surface.
The steel cord is preferably a galvanized steel cord from the viewpoint of further excellent effects and excellent rust prevention properties of the present invention.
The wire diameter, the cord diameter, or the like of the steel cord can be appropriately selected.
The temperature at which the composition of the present invention is vulcanized may be, for example, about 140 to 160 ℃.
From the viewpoint of further improving the effects of the present invention (particularly, cold resistance), the brittle temperature of the vulcanizate obtained by vulcanizing the composition of the present invention is preferably-50 ℃ or lower, more preferably-58 ℃ or lower.
In the present invention, the composition of the present invention is press-vulcanized at 153 ℃ and a surface pressure of 2.0MPa for 20 minutes to obtain a vulcanized rubber (sheet having a thickness of 2mm), and the vulcanized rubber is used in accordance with JIS K6261-2: 2017 "vulcanized rubber and thermoplastic rubber-method for solving low temperature characteristics-second section: low temperature impact embrittlement test ", the embrittlement temperature is measured.
The composition of the present invention can be preferably used for the production of a conveyor belt, for example. In the case where the composition of the present invention is used for the production of a conveyor belt, the composition of the present invention is preferably used as a member constituting the conveyor belt, for example, to form a coating rubber layer (cushion rubber) coating a steel cord.
[ conveyor belt ]
Next, the conveyor belt of the present invention will be explained below.
The conveyor belt of the present invention is formed by using the rubber composition for bonding steel cords of the present invention.
Preferably, the conveyor belt of the present invention has a steel cord. From the viewpoint of further improving the effects of the present invention, the steel cord is preferably a steel cord galvanized on a steel cord having an untreated surface.
The rubber composition for bonding a steel cord used in the conveyor belt of the present invention is not particularly limited as long as it is the rubber composition for bonding a steel cord of the present invention.
From the viewpoint of further improving the effects of the present invention, the composition of the present invention preferably forms a coating rubber layer (cushion rubber) coating the steel cord.
As one preferable embodiment, the conveyor belt of the present invention further includes a cover rubber layer. The rubber composition capable of forming the aforementioned cap rubber layer is not particularly limited.
Hereinafter, a conveyor belt according to the present invention will be described with reference to the drawings. The conveyor belt of the present invention is not limited to the accompanying drawings.
FIG. 1 is a cross-sectional perspective view schematically illustrating one example of the conveyor belt of the present invention.
In fig. 1, the conveyor belt 1 has cover rubber layers 6 on both surfaces, and has steel cords 2 and a coating rubber layer 4 between the cover rubber layers 6. The coating rubber layer 4 coats the steel cord 2. The coating rubber layer 4 is preferably formed of the rubber composition for bonding steel cords of the present invention.
[ examples ]
The present invention will be specifically described below with reference to examples. However, the present invention is not limited thereto.
< preparation of composition >
The components of the first table were used in the compositions (parts by mass) shown in the first table below.
First, the components other than sulfur and the vulcanization accelerator among the components shown in the first table below were mixed in a banbury mixer, and then sulfur and the vulcanization accelerator were added to the obtained mixture and mixed using a roll (roll) to prepare each composition.
Evaluation
The following evaluations were performed using the respective compositions produced as described above. The results are shown in the first table.
< Cold resistance >
The cold resistance was evaluated by the embrittlement temperature.
Evaluation method
Each of the above compositions was press-vulcanized for 20 minutes at 153 ℃ under a surface pressure of 2.0MPa using a press molding machine to obtain a vulcanized rubber (sheet having a thickness of 2 mm).
According to JIS K6261-2: 2017 "vulcanized rubber and thermoplastic rubber-method for solving low temperature characteristics-second section: low-temperature impact embrittlement test "in which test pieces were prepared from the respective vulcanized rubbers, and impact bending was applied to the respective test pieces under predetermined conditions. When the test piece was subjected to impact bending, the temperature at which 50% of the total number of the test pieces were broken was measured, and the temperature measured as described above was set as the "embrittlement temperature".
Evaluation criteria
In the present invention, the brittle temperature is-50 ℃ or lower, and the cold resistance is evaluated to be excellent.
When the embrittlement temperature exceeds-50 ℃, the cold resistance is evaluated to be poor.
The lower the embrittlement temperature is-50 ℃ or lower, the more excellent cold resistance is evaluated.
< durability >
Durability was evaluated by elongation at break (EB) retention.
Evaluation method
Each of the above-mentioned compositions was press-vulcanized for 20 minutes at 153 ℃ under a surface pressure of 2.0MPa using a press molding machine to obtain an initial vulcanized rubber.
Further, each of the above-mentioned compositions (each of the unvulcanized rubber compositions produced as described above) was separately left at 153 ℃ for 90 minutes to obtain a time-vulcanized rubber.
From each of the initially vulcanized rubbers thus obtained, an initial test piece (thickness: 2mm) of JIS3 dumbbell type was punched out. Also, a time-lapse test piece was obtained from each of the time-lapse vulcanized rubbers.
According to JIS K6251: 2017 tensile tests were carried out on the initial test piece and the aged test piece obtained as described above at room temperature and at a tensile rate of 500 mm/min, and the elongation at break (EB) was measured.
The values of the elongation at break of the initial test piece and the test piece over time were substituted into the following formula, and the retention rate of the elongation at break was calculated.
Retention rate (%) of elongation at break (EB) (elongation at break of test piece over time)/(elongation at break of initial test piece) × 100
Evaluation criteria
In the present invention, when the above-mentioned elongation at break retention ratio is 45% or more, the durability is evaluated to be excellent.
When the retention ratio is less than 45%, the durability is evaluated to be poor.
The more the retention rate is greater than 45%, the more excellent the durability is evaluated.
< Water resistant adhesion >
The water-resistant adhesion was evaluated by the rubber adhesion rate.
Evaluation method
Each of the compositions produced as described above was applied to a galvanized steel cord having a diameter of 4.1mm, which was stored in a dryer and subjected to dust-proof and moisture-proof treatment, at a thickness of 15mm to prepare a composite of each composition and the steel cord (in a state where the steel cord was embedded in the composition), and the composite was press-vulcanized for 20 minutes at 153 ℃ and a surface pressure of 2.0MPa using a press molding machine to prepare a test piece (rubber/galvanized steel cord composite). In the test piece, the boundary between the rubber and the steel cord at the position where the steel cord protrudes from the rubber surface was sealed with beeswax, and the test piece was placed in a constant temperature and humidity bath at a temperature of 50 ℃ and a relative humidity of 95% for one week. Then, a drawing test for drawing a steel cord from each test piece was performed at room temperature. The above extraction test was carried out in accordance with DIN 22131.
After the pull-out test, the state of the pulled-out steel cord was checked, and the ratio of the coating area of the rubber remaining on the surface of the steel cord after the pull-out to the surface area of the original steel cord (rubber coating rate,%) was calculated. The rubber coating rate calculated as described above is shown in a first table as a rubber adhesion rate.
Evaluation criteria
In the present invention, when the rubber adhesion rate (rubber coating rate) is 65% or more, the water resistant adhesion is evaluated to be excellent.
When the rubber adhesion rate is less than 65%, the water resistant adhesion is evaluated to be poor.
The larger the rubber adhesion rate, the more excellent the water-resistant adhesion was evaluated, as the rubber adhesion rate was more than 65%.
[ Table 1]
The details of each component shown in the first table are as follows.
NR: natural rubber. TSR20
SBR: styrene butadiene copolymer rubber. NIPOL 1502 (manufactured by ZEON, Japan). Glass transition temperature-54 ℃. A weight average molecular weight of 49 ten thousand, a bound styrene content of 24% by mass, and a vinyl content of 16% by mass
BR: polybutadiene rubber. Nipol BR1220, manufactured by ZEON CORPORATION, Japan. The weight average molecular weight is 50 ten thousand, the glass transition temperature is-105 DEG C
HAF grade carbon black: SHOBALACK N330T (nitrogen adsorption specific surface area 74 m) manufactured by Cabot Japan K.K2/g)
Phenol resin: sumilite RESIN PR-175, Sumitomo DUREZ
Gum rosin: china rosin WW, manufactured by Mitsui chemical industries, Ltd.
Chlorinated paraffin (chlorine content 70%): chlorinated paraffin (chlorine content 70 mass%). The product name is EMPARA 70S, manufactured by MIKO FINE-TECHNO.
Cobalt naphthenate (cobalt content 10%): cobalt naphthenate. The cobalt content was 10 mass%. Cobalt naphthenate 10%, manufactured by DICCORPORATION
Cobalt neodecanoate borate: cobalt neodecanoate borate represented by the following formula (1). DICNATE NBC-II (cobalt content: 22.2% by mass) manufactured by DIC CORPORATION
[ chemical formula 2]
Zinc oxide: JIS #3 Zinc oxide manufactured by Nakazai chemical industries
Stearic acid: stearic acid YR (manufactured by Nizhi corporation)
Paraffin oil: engine oil 22 (Zhaohe Shell brand oil Co., Ltd.)
Vulcanization accelerator DM: a thiazole-based vulcanization accelerator. Dibenzothiazyl disulfide. Trade name SANCELERDM-PO, Sanxin chemical industry Co., Ltd.)
Sulfur: jinhua brand oil-containing powder sulfur (Crane manufactured by chemical industry Co., Ltd.)
As is apparent from the results shown in the first table, comparative example 1, which contained no cobalt borate neodecanoate and contained cobalt naphthenate instead, had low durability.
Comparative example 2, which contained no polybutadiene rubber and had all the rubber components of natural rubber, was inferior in water-resistant adhesion.
The cold resistance and durability were inferior in comparative example 3 in which polybutadiene rubber was not contained, all rubber components were natural rubber, and the content of cobalt neodecanoate borate was larger than that in comparative example 2.
Comparative example 4, which contained no polybutadiene rubber and cobalt neodecanoate borate, natural rubber and SBR in place of the polybutadiene rubber, and cobalt naphthenate in place of the cobalt neodecanoate borate, was inferior in durability.
In contrast, the composition of the present invention is excellent in cold resistance, durability and water-resistant adhesion.
Description of the symbols
1 conveyor belt
2 steel cord
4 coating rubber layer
6 covering the rubber layer.
Claims (13)
1. A rubber composition for bonding a steel cord, which contains a rubber component containing at least polybutadiene rubber and cobalt neodecanoate borate.
2. The rubber composition for bonding steel cords according to claim 1,
the rubber component further comprises natural rubber and/or styrene butadiene copolymer rubber.
3. The rubber composition for steel cord adhesion according to claim 1 or 2, wherein,
the polybutadiene rubber is contained in an amount of 15 to 60 parts by mass per 100 parts by mass of the rubber component.
4. The rubber composition for steel cord adhesion according to claim 1 or 2, wherein,
also contains carbon black, and the additive also contains carbon black,
the content of the carbon black is 35 to 75 parts by mass per 100 parts by mass of the rubber component.
5. The rubber composition for steel cord adhesion according to claim 1 or 2, wherein,
the content of the cobalt borate neodecanoate is 1.2 to 3.5 parts by mass per 100 parts by mass of the rubber component.
6. The rubber composition for steel cord adhesion according to claim 1 or 2, wherein,
and also contains a vulcanization accelerator, and the like,
the vulcanization accelerator is a thiazole vulcanization accelerator.
7. The rubber composition for bonding steel cords according to claim 6,
the content of the vulcanization accelerator is 0.3 to 1.2 parts by mass with respect to 100 parts by mass of the rubber component.
8. The rubber composition for steel cord adhesion according to claim 1 or 2, wherein,
also contains sulfur, and the additive also contains sulfur,
the sulfur content is 2.1 to 5.0 parts by mass per 100 parts by mass of the rubber component.
9. The rubber composition for steel cord adhesion according to claim 1 or 2, wherein,
further comprises at least one selected from the group consisting of rosin, rosin derivatives, phenol resins, and chlorinated paraffins.
10. The rubber composition for steel cord adhesion according to claim 1 or 2, wherein,
and also contains zinc oxide, and the zinc oxide,
the content of the zinc oxide is 5.0 parts by mass or more per 100 parts by mass of the rubber component.
11. The rubber composition for steel cord adhesion according to claim 1 or 2, wherein,
also contains the oil, and the oil is mixed,
the oil content is 2.0 parts by mass or more per 100 parts by mass of the rubber component.
12. The rubber composition for steel cord adhesion according to claim 1 or 2, which is used for adhesion of a galvanized steel cord.
13. A conveyor belt comprising the rubber composition for bonding steel cords according to any one of claims 1 to 12.
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| JP2019034272A JP7293720B2 (en) | 2019-02-27 | 2019-02-27 | Steel cord adhesive rubber composition and conveyor belt |
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| CN111621066A true CN111621066A (en) | 2020-09-04 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101045840A (en) * | 2006-03-31 | 2007-10-03 | 住友橡胶工业株式会社 | Rubber composition for coating cord |
| JP2011057374A (en) * | 2009-09-10 | 2011-03-24 | Bridgestone Corp | Rubber composition for conveyor belt and conveyor belt |
| CN102449053A (en) * | 2009-04-20 | 2012-05-09 | 株式会社普利司通 | Rubber composition for conveyor belt and conveyor belt |
| CN102459449A (en) * | 2009-04-20 | 2012-05-16 | 株式会社普利司通 | Rubber composition for conveyor belt, and conveyor belt |
| CN104837911A (en) * | 2012-12-14 | 2015-08-12 | 横滨橡胶株式会社 | Rubber composition and conveyor belt |
| JP2017031240A (en) * | 2015-07-29 | 2017-02-09 | 横浜ゴム株式会社 | Rubber composition for coating tire steel cord |
| JP2018131522A (en) * | 2017-02-15 | 2018-08-23 | 横浜ゴム株式会社 | Rubber composition |
| CN108884274A (en) * | 2016-04-14 | 2018-11-23 | 横滨橡胶株式会社 | Rubber composition |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100103853A (en) * | 2007-12-27 | 2010-09-28 | 가부시키가이샤 브리지스톤 | Rubber composition |
| JP5205972B2 (en) * | 2008-01-07 | 2013-06-05 | 横浜ゴム株式会社 | Rubber composition for pneumatic tire |
| JP2011021162A (en) * | 2009-07-21 | 2011-02-03 | Yokohama Rubber Co Ltd:The | Rubber composition for pneumatic tire |
| JP2015218280A (en) * | 2014-05-19 | 2015-12-07 | 横浜ゴム株式会社 | Rubber composition for coating of steel cord |
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101045840A (en) * | 2006-03-31 | 2007-10-03 | 住友橡胶工业株式会社 | Rubber composition for coating cord |
| CN102449053A (en) * | 2009-04-20 | 2012-05-09 | 株式会社普利司通 | Rubber composition for conveyor belt and conveyor belt |
| CN102459449A (en) * | 2009-04-20 | 2012-05-16 | 株式会社普利司通 | Rubber composition for conveyor belt, and conveyor belt |
| JP2011057374A (en) * | 2009-09-10 | 2011-03-24 | Bridgestone Corp | Rubber composition for conveyor belt and conveyor belt |
| CN104837911A (en) * | 2012-12-14 | 2015-08-12 | 横滨橡胶株式会社 | Rubber composition and conveyor belt |
| JP2017031240A (en) * | 2015-07-29 | 2017-02-09 | 横浜ゴム株式会社 | Rubber composition for coating tire steel cord |
| CN108884274A (en) * | 2016-04-14 | 2018-11-23 | 横滨橡胶株式会社 | Rubber composition |
| JP2018131522A (en) * | 2017-02-15 | 2018-08-23 | 横浜ゴム株式会社 | Rubber composition |
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