WO2019240190A1 - 金属コード、金属コード-ゴム複合体およびコンベヤベルト - Google Patents
金属コード、金属コード-ゴム複合体およびコンベヤベルト Download PDFInfo
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- WO2019240190A1 WO2019240190A1 PCT/JP2019/023335 JP2019023335W WO2019240190A1 WO 2019240190 A1 WO2019240190 A1 WO 2019240190A1 JP 2019023335 W JP2019023335 W JP 2019023335W WO 2019240190 A1 WO2019240190 A1 WO 2019240190A1
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- Prior art keywords
- plane
- metal
- metal cord
- zinc
- rubber
- Prior art date
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
- D07B1/0606—Reinforcing cords for rubber or plastic articles
- D07B1/0666—Reinforcing cords for rubber or plastic articles the wires being characterised by an anti-corrosive or adhesion promoting coating
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- 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
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
- D07B1/0606—Reinforcing cords for rubber or plastic articles
- D07B1/062—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration
- D07B1/0626—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration the reinforcing cords consisting of three core wires or filaments and at least one layer of outer wires or filaments, i.e. a 3+N configuration
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
- D07B1/0606—Reinforcing cords for rubber or plastic articles
- D07B1/0613—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the rope configuration
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
- D07B1/0606—Reinforcing cords for rubber or plastic articles
- D07B1/062—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration
- D07B1/0633—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration having a multiple-layer configuration
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2001—Wires or filaments
- D07B2201/201—Wires or filaments characterised by a coating
- D07B2201/2011—Wires or filaments characterised by a coating comprising metals
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2001—Wires or filaments
- D07B2201/201—Wires or filaments characterised by a coating
- D07B2201/2013—Wires or filaments characterised by a coating comprising multiple layers
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2015—Strands
- D07B2201/2023—Strands with core
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2015—Strands
- D07B2201/2036—Strands characterised by the use of different wires or filaments
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2047—Cores
- D07B2201/2052—Cores characterised by their structure
- D07B2201/2059—Cores characterised by their structure comprising wires
- D07B2201/2061—Cores characterised by their structure comprising wires resulting in a twisted structure
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2205/00—Rope or cable materials
- D07B2205/30—Inorganic materials
- D07B2205/3021—Metals
- D07B2205/3071—Zinc (Zn)
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2205/00—Rope or cable materials
- D07B2205/30—Inorganic materials
- D07B2205/3021—Metals
- D07B2205/3085—Alloys, i.e. non ferrous
- D07B2205/3089—Brass, i.e. copper (Cu) and zinc (Zn) alloys
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12771—Transition metal-base component
- Y10T428/12785—Group IIB metal-base component
- Y10T428/12792—Zn-base component
Definitions
- the present invention relates to a metal cord, a metal cord composite, and a conveyor belt, and more particularly, to a metal cord, a metal cord-rubber composite, and a conveyor belt that are more excellent in adhesion to rubber than in the past.
- the conveyor belt is embedded with steel cords for reinforcement along the circumferential direction of the belt, thereby increasing the tensile strength (belt strength) along the circumferential direction of the conveyor belt.
- the steel cord for reinforcement is generally galvanized with excellent corrosion resistance. This is because the steel cord is easily exposed to the outside air due to damage caused by the conveyor belt and the like, and is easily corroded. However, it is known that galvanizing is inferior to brass plating used in tires and the like in terms of adhesion to rubber.
- Patent Document 1 a plurality of strands having a plurality of outermost layer filaments constituting the outer peripheral portion and inner filaments located inside these outermost layer filaments are twisted together, and among the plurality of strands
- the outermost layer filament of the outermost layer strand constituting the outer periphery of the reinforcing steel cord is subjected to brass plating treatment, and at least one filament located inside the outermost layer strand is subjected to galvanization treatment for reinforcement Steel cords have been proposed. This improves the adhesion between the steel cord and rubber while ensuring the reinforcement of the rubber article.
- an object of the present invention is to provide a metal cord, a metal cord-rubber composite, and a conveyor belt that are more excellent in adhesion to rubber than in the past.
- the present inventors obtained the following knowledge as a result of intensive studies to solve the above problems.
- a running test was conducted using a conveyor belt with a galvanized steel cord as a reinforcing material, and a microanalysis of the galvanized surface on the outermost steel filament revealed that cracks occurred on the galvanized surface. I found out. Further, by further observing the surface of the galvanized plate in which the crack was generated, it was found that twin deformation occurred on the surface of the (102) plane having a high degree of crystal orientation.
- the present inventors have further intensively studied. As a result, the inventors have found that the above problem can be solved by setting the crystal structure of zinc to a predetermined one, and have completed the present invention.
- the metal cord of the present invention preferably has a brass plating layer inside the galvanized layer. Furthermore, in the metal cord of the present invention, the metal filament is preferably a steel filament.
- the metal cord-rubber composite of the present invention is characterized in that the metal cord of the present invention is embedded in a rubber composition.
- the conveyor belt of the present invention is characterized by comprising the metal cord of the present invention.
- the present invention it is possible to provide a metal cord, a metal cord-rubber composite, and a conveyor belt that are more excellent in adhesion to rubber than in the past.
- the metal cord of the present invention is a metal cord formed by twisting a plurality of metal filaments.
- the twisted structure is not particularly limited, and is not limited to single twist, layer twist, etc., but a metal filament is twisted to form a single twist and layer twist metal cord, and this metal cord is used as a strand. It may be a metal cord having a multiple twist structure in which a plurality of strands are twisted together.
- FIG. 1 is a schematic cross-sectional view of a metal cord according to one preferred embodiment of the present invention
- FIG. 2 is a schematic cross-sectional view of a metal cord according to another preferred embodiment of the present invention.
- a metal cord 10 shown in FIG. 1 has a strand 15 formed by twisting eight metal filaments 11 as a sheath layer 13 around a core 12 in which two metal filaments 11 are twisted together.
- This is a metal cord 10 having a 7 ⁇ (2 + 8) structure in which six strands 15 are twisted together.
- the metal cord 20 shown in FIG. 2 twists eight metal filaments 21 as the first sheath layer 23 around the core 22 formed by twisting the two metal filaments 21, and the first sheath layer 23.
- the metal cords 10 and 20 of the present invention have galvanized layers 16 and 26 on the surface of the metal filament constituting the outermost layer.
- the galvanized layers 16 and 26 may be formed by electrogalvanizing.
- the metal filament constituting the outermost layer is the outermost layer metal filament of the outermost layer strand, and the outermost layer metal filament of the core strand may be provided with a galvanized layer. It is not necessary to provide it.
- the metal filament constituting the outermost layer only needs to have a galvanized layer, and a part of the other metal filaments may be provided with a galvanized layer.
- a galvanized layer may be provided on the metal filament.
- the degree of crystal orientation can be expressed by (peak height of galvanized evaluation sample) / (unoriented zinc peak height).
- the crystal orientation degree F (002) of the (002) plane is determined using an X-ray diffractometer (XRD) using the Zn (002) plane, (102) plane, (101) plane of the evaluation sample, The diffraction intensity of the (100) plane is measured, and R1 (002) , R1 (102) , R1 (101) , R1 (100) are indexed so that the total peak intensity becomes 100, and (R1 (002) / R0 (002) ) ⁇ 100 (%).
- the hexagonal crystal plane subjected to the electrogalvanizing treatment is mainly composed of a (002) plane, a (102) plane, a (101) plane, and a (100) plane.
- a running test is carried out using a conveyor belt using a steel cord subjected to electrogalvanization as a reinforcing material and cracks on the galvanized surface on the outermost steel filament are observed, the degree of crystal orientation is large.
- Twin deformation occurs on the surface of the (102) plane. That is, since the (002) plane and the (102) plane are nearly parallel to the metal filament surface, they are easily deformed in the longitudinal direction of the conveyor belt, and crystals are easily broken.
- the degree of crystal orientation of the (002) plane and the (102) plane on the surfaces of the galvanized layers 16 and 26 provided on the outermost layer filament is set to less than 120 to suppress the breakage of crystals. Preferably it is less than 80.
- the crystal orientation degrees F (002) and F (102) of the (002) plane and the (102) plane are preferably as low as possible, but may be 0 or more.
- the crystal orientation degree F (101 ) expressed by the following formulas (3) and (4) of the (101) plane and the (100) plane of the surface of the galvanized layers 16 and 26.
- F (100) are preferably 100 or more.
- F (101) (R1 (101) / R0 (101) ) ⁇ 100 (%)
- F (100) (R1 (100) / R0 (100) ) ⁇ 100 (%) (4)
- the degree of crystal orientation can be expressed by (peak height of galvanized evaluation sample) / (unoriented zinc peak height).
- the crystal orientation degree F (101) of the (101) plane is determined using an X-ray diffractometer (XRD) using the Zn (002) plane, (102) plane, (101) plane of the evaluation sample, The diffraction intensity of the (100) plane is measured, and R1 (002) , R1 (102) , R1 (101) , R1 (100) are indexed so that the total peak intensity becomes 100, and (R1 (101) / R0 (101) ) ⁇ 100 (%).
- the (101) plane and the (100) plane are nearly perpendicular to the metal filament surface compared to the (002) plane and the (102) plane, they are difficult to deform in the longitudinal direction of the conveyor belt. Therefore, by increasing the degree of crystal orientation of these planes, it is possible to suitably suppress crystal breakage on the surfaces of the galvanized layers 16 and 26.
- the upper limit of the crystal orientation degree F (101) of the ( 101 ) plane and the degree of crystal orientation F (100) of the (100) plane is preferable.
- the crystal orientation degree F (101) of the (101) plane can be 179 or less, and the crystal orientation degree F (100) of the (100) plane can be 760 or less.
- the galvanized layers 16 and 26 on the surface of the metal filament constituting the outermost layer in the metal cords 10 and 20 of the present invention can be formed by electrogalvanizing, for example.
- the crystal orientation of the galvanized layer can be controlled by using a plating reaction inhibitor.
- a plating reaction inhibitor by adding a plating reaction inhibitor, the degree of crystal orientation of the (002) plane and the (102) plane of the surface of the galvanized layers 16 and 26 can be reduced, and the (101) plane and the (100) plane are reduced.
- the degree of crystal orientation can be increased.
- the plating reaction inhibitor polyethylene glycol, saccharin, unsaturated alcohol and the like can be used.
- the galvanizing bath used for electrogalvanizing one having a known composition can be used except that the above-mentioned plating reaction inhibitor is added.
- known ones such as a zinc sulfate bath and a zinc chloride bath can be used.
- the zinc sulfate bath one containing zinc sulfate (7 hydrate) of about 50 to 300 g / L, with mineral acid and supporting electrolyte added as necessary can be used.
- the zinc chloride bath zinc chloride (7 hydrate) is about 50 to 300 g / L, and a mineral acid or supporting electrolyte can be added if necessary.
- the temperature of the galvanizing bath is preferably 30 to 70 ° C.
- the temperature of the galvanizing bath is set to 30 ° C. or higher, good electrodeposition efficiency can be obtained in electrogalvanizing.
- the energy cost can be suppressed by setting the temperature to less than 70 ° C. Further, since evaporation of the plating bath can be suppressed, it is advantageous in terms of concentration management of the plating bath.
- the material of the metal filament is not particularly limited.
- a steel filament is preferable from the viewpoint of cost and strength.
- Steel refers to steel, that is, a metal having iron as a main component (the mass of iron exceeds 50 mass% with respect to the total mass of the metal steel wire), and may be composed of only iron, For example, metals such as zinc, copper, aluminum, and tin may be included.
- the metal cords 10 and 20 of the present invention preferably have a brass plating layer inside the galvanized layers 16 and 26.
- gum improves.
- the ratio of copper to zinc (copper: zinc) can usually be 60 to 70:30 to 40 on a mass basis.
- the thickness of the brass plating layer can be 100 nm to 300 nm.
- the brass plating layer on the surface of the metal filament is, for example, a metal filament material that is repeatedly subjected to dry wire drawing to a predetermined intermediate wire diameter (dry wire drawing step), and the obtained metal filament material
- dry wire drawing step a metal filament material that is repeatedly subjected to dry wire drawing to a predetermined intermediate wire diameter
- drying treatment step copper and zinc are plated sequentially on the metal filament material after the patenting treatment, and then heat is applied to make brass (brass plating step).
- the resulting brass-plated metal filament It can be manufactured by subjecting the material to continuous wet wire drawing (continuous wet wire drawing step).
- the dry wire drawing step, the patenting treatment step and the continuous wet wire drawing step can be performed under known conditions, and the copper plating bath and the galvanizing bath can be performed under known conditions using known ones. .
- the galvanized layers 16 and 26 are formed on the surface of the metal filament constituting the outermost layer, and the (002) plane and (102) in the galvanized layers 16 and 26 are formed.
- the crystal orientation degree of the plane is less than 120.
- the metal cord 10 shown in FIG. 1 has a 7 ⁇ (2 + 8) structure
- the metal cord 20 shown in FIG. 2 has a 7 ⁇ (2 + 8 + 14) structure obtained by twisting strands 25 having a 2 + 8 + 14 structure.
- the cord structure is not limited to a double twist structure, and may be a single twist structure or a layer twist structure.
- the twist pitch and twist direction of the metal filaments 11 and 21 and the twist pitch and twist direction of the strands 15 and 25 are not particularly limited, and can be appropriately set according to the purpose.
- the metal cord-rubber composite of the present invention is obtained by embedding the metal cords 10, 20 of the present invention in a rubber composition.
- a rubber composition There is no particular limitation on the rubber constituting the rubber composition according to the metal cord-rubber composite of the present invention.
- rubber components include natural rubber, polybutadiene rubber, polyisoprene rubber, styrene-butadiene copolymer rubber, acrylonitrile-butadiene copolymer rubber, ethylene-propylene copolymer rubber, ethylene-propylene-diene terpolymer rubber, Examples thereof include butyl rubber, halogenated butyl rubber, alkylated chlorosulfonated polyethylene rubber, isobutylene-isoprene copolymer rubber, and polychloroprene rubber.
- one rubber component may be used alone, or two or more rubber components may be used in combination.
- components usually employed in the rubber industry may be appropriately blended within a range not impairing the object of the present invention.
- examples of other components include vulcanizing agents such as sulfur, fillers such as silica and carbon black, oils such as process oils, vulcanization accelerators, anti-aging agents, softeners, zinc oxide, and stearic acid. Is mentioned.
- the rubber composition according to the metal cord-rubber composite of the present invention can be produced by kneading these components by a conventional method, heating and extruding, and the like.
- the metal cord-rubber composite of the present invention comprises an uncrosslinked rubber sheet having a thickness of about 5.0 mm made of the rubber composition from above and below both sides of the metal cord arranged in parallel at a predetermined interval. And can be produced by vulcanizing at a temperature of about 160 ° C. for about 20 minutes.
- the conveyor belt of the present invention is provided with the metal cord of the present invention, and in particular, the metal cord of the present invention is used as a reinforcing material in the circumferential direction of the conveyor belt.
- the metal cord of the present invention is excellent in adhesiveness to rubber, the conveyor belt of the present invention is excellent in durability.
- the conveyor belt of the present invention is not particularly limited except that the metal cord of the present invention is used, and a known structure and material can be used.
- the method for producing the conveyor belt of the present invention is not particularly limited, and can be produced by a known method.
- a rubber composition for a conveyor belt is formed into a sheet by extrusion molding (a known molding method such as a calendar), and the metal cord of the present invention, which is a reinforcing material, is used as a core material to cover the sheet rubber.
- the molded product rubber composition for conveyor belt
- it can be obtained by vulcanization and curing in accordance with a conventional method.
- Examples 1 to 4 and Comparative Example> Steel cords having structures shown in Tables 1 and 2 were prepared using three types of steel filaments having wire diameters of 0.525, 0.46, and 0.395 mm.
- the steel filament was brass-plated, and the surface of the steel filament constituting the outermost layer of the steel cord was galvanized.
- the composition of the galvanizing bath used for galvanizing and the conditions for electrogalvanizing are as follows.
- the crystal orientation degree F was adjusted by changing the concentration of the plating reaction inhibitor.
- Zinc plating bath composition Zinc sulfate: 300 g / L Sulfuric acid: 1 g / L pH: 3 Plating reaction inhibitor: Saccharin Plating reaction inhibitor concentration: 0.5 to 3.0 g / L Plating bath temperature: 30 ° C Current density: 12.5 A / dm 2
- a conveyor belt was produced using the obtained steel cord as a circumferential reinforcing material, and durability was evaluated by a running test according to the following procedure.
- the structure of the conveyor belt was ST1600.
- the metal cord of the present invention is excellent in adhesion to rubber, and is particularly suitable as a reinforcing material for conveyor belts.
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Abstract
Description
最外層を構成する前記金属フィラメントの表面に亜鉛めっき層が形成されてなり、前記亜鉛めっき層表面の、(002)面および(102)面の下記式(1)および(2)、
F(002)=(R1(002)/R0(002))×100(%) (1)
F(102)=(R1(102)/R0(102))×100(%) (2)
(ここで、式(1)中の、R0(002)は、無配向の亜鉛のピーク強度(002)面の回折強度=22.1であり、R1(002)は、評価サンプルの亜鉛のピーク強度(002)面の回折強度であり、式(2)中、R0(102)は、無配向の亜鉛のピーク強度(102)面の回折強度=8.4あり、R1(102)は、評価サンプルの亜鉛のピーク強度(102)面の回折強度である。)で表される結晶配向度F(002)およびF(102)が120未満であることを特徴とするものである。
F(101)=(R1(101)/R0(101))×100(%) (3)
F(100)=(R1(100)/R0(100))×100(%) (4)
(ここで、式(3)中の、R0(101)は、無配向の亜鉛のピーク強度(101)面の回折強度=56.4であり、R1(101)は、評価サンプルの亜鉛のピーク強度(101)面の回折強度であり、式(4)中、R0(100)は、無配向の亜鉛のピーク強度(100)面の回折強度=13.2あり、R1(100)は、評価サンプルの亜鉛のピーク強度(100)面の回折強度である。)で表される結晶配向度F(101)およびF(100)が100以上であることが好ましい。
本発明の金属コードは、複数本の金属フィラメントが撚り合わされてなる金属コードである。本発明の金属コードにおいては、撚り構造としては、特に制限はなく、単撚り、層撚り等に限らず、金属フィラメントを撚り合わせて単撚りおよび層撚りの金属コードとし、この金属コードをストランドとして複数本撚り合わせた複撚り構造の金属コードであってもよい。
F(002)=(R1(002)/R0(002))×100(%) (1)
F(102)=(R1(102)/R0(102))×100(%) (2)
F(101)=(R1(101)/R0(101))×100(%) (3)
F(100)=(R1(100)/R0(100))×100(%) (4)
本発明の金属コード-ゴム複合体は、本発明の金属コード10、20が、ゴム組成物に埋設されてなるものである。本発明の金属コード-ゴム複合体に係るゴム組成物を構成するゴムについては特に制限はない。例えば、ゴム成分としては、天然ゴム、ポリブタジエンゴム、ポリイソプレンゴム、スチレン-ブタジエン共重合体ゴム、アクリロニトリル-ブタジエン共重合体ゴム、エチレン-プロピレン共重合体ゴム、エチレン-プロピレン-ジエンターポリマーゴム、ブチルゴム、ハロゲン化ブチルゴム、アルキル化クロロスルホン化ポリエチレンゴム、イソブチレン-イソプレン共重合体ゴム、ポリクロロプレンゴム等が挙げられる。本発明の金属コード-ゴム複合体においては、ゴム成分は、一種を単独で用いてもよいし、二種以上組み合わせて用いてもよい。
本発明のコンベヤベルトは、本発明の金属コードを備えたものであり、特に、本発明の金属コードをコンベヤベルトの周方向の補強材として用いたものである。特に、前述のとおり、本発明の金属コードは、ゴムとの接着性に優れているため、本発明のコンベヤベルトは、耐久性に優れている。なお、本発明のコンベヤベルトは、本発明の金属コードを用いたこと以外は特に制限はなく、既知の構造および材質を用いることができる。
<実施例1~4および比較例>
線径が0.525、0.46、0.395mmの3種のスチールフィラメントを用いて、表1、2に示す構造のスチールコードを作製した。スチールフィラメントにはブラスめっきが施されており、スチールコードの最外層を構成するスチールフィラメントの表面には、亜鉛めっきを施した。亜鉛めっきに使用した亜鉛めっき浴の組成、電気亜鉛めっきの条件は以下のとおりである。なお、結晶配向度Fは、めっき反応抑制剤の濃度を変化させて調整した。
硫酸亜鉛 :300g/L
硫酸 :1g/L
pH :3
めっき反応抑制剤:サッカリン
めっき反応抑制剤濃度:0.5~3.0g/L
めっき槽温度:30℃
電流密度:12.5A/dm2
(X線回折測定条件)
X線源:クロム
出力 :38kV
周長11.6mのコンベヤベルトを、プーリー径1200mmのプーリーに掛け、ベルト速度を250m/min、所定のベルト張力をかけて走行試験を行った。ベルト張力は、最小154kg/コードから42秒かけて最大1246kg/コードとし、その後、8秒かけて最小154kg/コードとするサイクルを繰り返し行った。結果は、比較例1のコンベヤベルトが故障するまでの時間を100とする指数とした。この値が大きいほど、コンベヤベルトの耐久性が優れていることを意味する。
11、21 金属フィラメント
12、22 コア
13、23 第1シース層
24 第2シース増層
15、25 ストランド
16、26 亜鉛めっき層
Claims (6)
- 複数本の金属フィラメントが撚り合わされてなる金属コードにおいて、
最外層を構成する前記金属フィラメントの表面に亜鉛めっき層が形成されてなり、前記亜鉛めっき層表面の、(002)面および(102)面の下記式(1)および(2)、
F(002)=(R1(002)/R0(002))×100(%) (1)
F(102)=(R1(102)/R0(102))×100(%) (2)
(ここで、式(1)中の、R0(002)は、無配向の亜鉛のピーク強度(002)面の回折強度=22.1であり、R1(002)は、評価サンプルの亜鉛のピーク強度(002)面の回折強度であり、式(2)中、R0(102)は、無配向の亜鉛のピーク強度(102)面の回折強度=8.4あり、R1(102)は、評価サンプルの亜鉛のピーク強度(102)面の回折強度である。)で表される結晶配向度F(002)およびF(102)が120未満であることを特徴とする金属コード。 - 前記亜鉛めっき層表面の、(101)面および(100)面の下記式(3)、(4)、
F(101)=(R1(101)/R0(101))×100(%) (3)
F(100)=(R1(100)/R0(100))×100(%) (4)
(ここで、式(3)中の、R0(101)は、無配向の亜鉛のピーク強度(101)面の回折強度=56.4であり、R1(101)は、評価サンプルの亜鉛のピーク強度(101)面の回折強度であり、式(4)中、R0(100)は、無配向の亜鉛のピーク強度(100)面の回折強度=13.2あり、R1(100)は、評価サンプルの亜鉛のピーク強度(100)面の回折強度である。)で表される結晶配向度F(101)およびF(100)が100以上である請求項1記載の金属コード。 - 前記亜鉛めっき層よりも内側に、ブラスめっき層を有する請求項1または2記載の金属コード。
- 前記金属フィラメントが、スチールフィラメントである請求項1~3のうちいずれか一項記載の金属コード。
- 請求項1~4のうちいずれか一項記載の金属コードが、ゴム組成物に埋設されてなることを特徴とする金属コード-ゴム複合体。
- 請求項1~4のうちいずれか一項記載の金属コードを備えたことを特徴とするコンベヤベルト。
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AU2019285850A AU2019285850A1 (en) | 2018-06-12 | 2019-06-12 | Metal cord, metal cord/rubber composite and conveyor belt |
US17/251,313 US11773534B2 (en) | 2018-06-12 | 2019-06-12 | Metal cord, metal cord/rubber composite and conveyor belt |
JP2020525630A JP7183266B2 (ja) | 2018-06-12 | 2019-06-12 | 金属コード、金属コード-ゴム複合体およびコンベヤベルト |
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JP2011202291A (ja) | 2010-03-24 | 2011-10-13 | Bridgestone Corp | ゴム体補強用スチールコードおよびコンベヤベルト |
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JP5678951B2 (ja) * | 2012-12-27 | 2015-03-04 | Jfeスチール株式会社 | 溶融亜鉛めっき鋼板 |
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2019
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- 2019-06-12 US US17/251,313 patent/US11773534B2/en active Active
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JPS544250A (en) * | 1977-06-07 | 1979-01-12 | Goodyear Tire & Rubber | Method of making steel wire for reinforcing rubber |
JPS5686639A (en) * | 1979-11-23 | 1981-07-14 | Sodetal | Manufacture of wire for strengthening rubber article and device used for said method |
JPH0544058A (ja) * | 1991-08-13 | 1993-02-23 | Kobe Steel Ltd | 加工性に優れた表面処理AlまたはAl合金材 |
JP2003532808A (ja) * | 2000-05-08 | 2003-11-05 | ナムローゼ・フェンノートシャップ・ベーカート・ソシエテ・アノニム | 耐疲労性が改善された亜鉛被覆鋼コード |
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US20210254279A1 (en) | 2021-08-19 |
US11773534B2 (en) | 2023-10-03 |
AU2019285850A1 (en) | 2021-01-14 |
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