WO2016072134A1 - Rubber composition for conveyor belts, and conveyor belt using same - Google Patents

Rubber composition for conveyor belts, and conveyor belt using same Download PDF

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Publication number
WO2016072134A1
WO2016072134A1 PCT/JP2015/074521 JP2015074521W WO2016072134A1 WO 2016072134 A1 WO2016072134 A1 WO 2016072134A1 JP 2015074521 W JP2015074521 W JP 2015074521W WO 2016072134 A1 WO2016072134 A1 WO 2016072134A1
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Prior art keywords
rubber
conveyor belt
mass
rubber composition
present
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PCT/JP2015/074521
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French (fr)
Japanese (ja)
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徳慶 鄒
英博 笹熊
貴宏 鈴木
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横浜ゴム株式会社
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Priority to CN201580059398.9A priority Critical patent/CN107075178A/en
Priority to AU2015344658A priority patent/AU2015344658B2/en
Publication of WO2016072134A1 publication Critical patent/WO2016072134A1/en

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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
    • 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
    • C08K3/02—Elements
    • C08K3/04—Carbon
    • 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
    • C08K3/02—Elements
    • C08K3/06—Sulfur
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/002—Physical properties
    • C08K2201/006—Additives being defined by their surface area

Definitions

  • the present invention relates to a rubber composition for a conveyor belt and a conveyor belt using the same.
  • Patent Document 1 describes a rubber composition for a belt of a belt conveyor characterized by containing, as a rubber component, polybutadiene rubber synthesized with a neodymium-based catalyst (Claim 1). Moreover, in the Example of patent document 1, the rubber composition which mix
  • the conveyor belt cover rubber (especially the upper surface cover rubber; the same applies hereinafter) is easily worn by friction with the object to be mounted, and wear resistance is required. At the same time, since the conveyor belt may convey an object having a sharp portion, the cover rubber is also required to be hardly damaged (high cut resistance).
  • the present inventors consider that excellent in all of these performances leads to a longer life of the cover belt. Under these circumstances, when the present inventors prepared a rubber composition based on Patent Document 1, there is a case where such a rubber composition does not satisfy the wear resistance and the cut resistance which are required recently. It became clear. Then, an object of this invention is to provide the rubber composition for conveyor belts which is excellent in abrasion resistance and cut resistance, and a conveyor belt using the same.
  • polybutadiene rubber has a Mooney viscosity and a weight average molecular weight at 100 ° C. in a specific range, a nitrogen adsorption specific surface area and a dibutyl phthalate oil absorption amount of carbon black. Is a specific range, and when the sulfur content is within a specific range, the inventors have found that a predetermined effect can be obtained, and have reached the present invention.
  • the present invention is based on the above knowledge and the like, and specifically, solves the above problems by the following configuration.
  • the rubber composition for conveyor belts according to 1 above wherein the weight average molecular weight is 5.5 ⁇ 10 5 to 9.0 ⁇ 10 5 . 3.
  • FIG. 1 is a cross-sectional view schematically showing an example of a preferred embodiment of the conveyor belt of the present invention.
  • a numerical range expressed using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value.
  • content of the said component refers to the total content of 2 or more types of substances.
  • the rubber composition for conveyor belts of the present invention (the composition of the present invention) With respect to 100 parts by mass of a rubber component containing 20 to 80% by mass of a polybutadiene rubber having a Mooney viscosity at 100 ° C. of 50 to 100 and a weight average molecular weight of 5.1 ⁇ 10 5 to 10.0 ⁇ 10 5 , 45 to 70 parts by mass of carbon black having a nitrogen adsorption specific surface area of 115 to 160 m 2 / g and a dibutyl phthalate oil absorption of 115 to 140 mL / 100 g; It is a rubber composition for conveyor belts containing 0.3 parts by mass or more and less than 2.0 parts by mass of sulfur.
  • the composition of this invention takes such a structure, it is thought that a desired effect is acquired. The reason is not clear, but it is presumed that it is as follows.
  • the polybutadiene rubber has a relatively large weight average molecular weight, and such a polybutadiene rubber is considered to have low dispersibility of carbon black.
  • the nitrogen adsorption specific surface area and dibutyl phthalate oil absorption are large, that is, the particle size of the basic particles constituting the carbon black is very small, and the carbon black has a high structure (the aggregate structure of the aggregate is
  • the present inventors speculate that the dispersibility of carbon black with respect to high molecular weight polybutadiene rubber and the processability of the rubber composition are improved, and a predetermined effect can be obtained. Further, the inventors speculate that the degree of vulcanization of the polybutadiene rubber becomes appropriate and the predetermined effect can be obtained when the sulfur content is within the predetermined range.
  • the composition of the present invention contains a rubber component, and the rubber component contains a predetermined polybutadiene rubber.
  • the polybutadiene rubber used in the composition of the present invention has a Mooney viscosity (ML 1 + 4 @ 100 ° C.) at 100 ° C. of 50 to 100, and a weight average molecular weight of 5.1 ⁇ 10 5 to 10.0 ⁇ . 10 5 .
  • the Mooney viscosity (ML 1 + 4 @ 100 ° C.) of the polybutadiene rubber is preferably 50 to 90, and more preferably 50 to 80.
  • the Mooney viscosity of the polybutadiene rubber was measured under the condition of 100 ° C. according to the method described in JIS K 6300-1: 2001.
  • the weight average molecular weight of the polybutadiene rubber is preferably 5.5 ⁇ 10 5 to 9.0 ⁇ 10 5 , and more preferably 5.5 ⁇ 10 5 to 8.0 ⁇ 10 5 .
  • the weight average molecular weight of the polybutadiene rubber is a standard polystyrene equivalent value based on a value measured by gel permeation chromatography (GPC) using cyclohexane as a solvent.
  • Examples of the method for producing polybutadiene rubber include a method of synthesizing butadiene by polymerizing butadiene using a catalyst such as a cobalt-based catalyst and / or a neodymium-based catalyst.
  • the cobalt-based catalyst and neodymium-based catalyst are not particularly limited.
  • the cobalt-based catalyst can be a compound having cobalt.
  • the neodymium catalyst can be a compound having neodymium (Nd). Of these, neodymium catalysts are preferable.
  • the polybutadiene rubbers can be used alone or in combination of two or more.
  • the rubber that the rubber component can contain other than the polybutadiene rubber is not particularly limited.
  • An example is diene rubber.
  • natural rubber and styrene butadiene rubber are preferable.
  • the rubber components that the rubber component can contain other than the polybutadiene rubber can be used alone or in combination of two or more.
  • the proportion of the polybutadiene rubber in the rubber component is 20 to 80% by mass.
  • the proportion of the polybutadiene rubber is preferably 30 to 70% by mass, and more preferably 40 to 60% by mass.
  • the remainder of the above ratio can be a rubber whose rubber component can be contained in addition to the polybutadiene rubber.
  • the carbon black contained in the composition of the present invention has a nitrogen adsorption specific surface area of 115 to 160 m 2 / g and a dibutyl phthalate oil absorption of 115 to 140 mL / 100 g.
  • the nitrogen adsorption specific surface area (N 2 SA) of carbon black is preferably 120 to 155 m 2 / g, more preferably 120 to 145 m 2 / g, and further preferably 120 to 140 m 2 / g. preferable.
  • the nitrogen adsorption specific surface area of carbon black was measured according to JIS K 6217-2: 2001.
  • Carbon black has a dibutyl phthalate oil absorption (DBP oil absorption) of preferably 115 to 130 mL / 100 g, more preferably 116 to 130 mL / 100 g, and still more preferably 120 to 130 mL / 100 g.
  • DBP oil absorption dibutyl phthalate oil absorption
  • carbon black examples include SAF and ISAF-HS. Carbon blacks can be used alone or in combination of two or more.
  • the content of carbon black is 45 to 70 parts by weight, preferably 45 to 65 parts by weight, and more preferably 45 to 55 parts by weight with respect to 100 parts by weight of the rubber component.
  • the sulfur contained in the composition of the present invention is not particularly limited.
  • the sulfur content is 0.3 parts by mass or more and less than 2.0 parts by mass, preferably 0.8 to 1.5 parts by mass, with respect to 100 parts by mass of the rubber component. More preferably, it is 1.5 parts by mass.
  • the composition of the present invention can further contain additives in addition to the above-described components as long as the effects and objects of the present invention are not impaired.
  • additives include carbon blacks other than predetermined carbon black, anti-aging agents such as anti-aging agent 6C, zinc oxide, stearic acid, processing aids, paraffin wax, aroma oil, liquid polymer, terpene resin, Examples thereof include thermosetting resins, vulcanizing agents other than sulfur, vulcanization aids, vulcanization accelerators, and vulcanization retarders.
  • the composition of the present invention is not particularly limited for its production.
  • the above-mentioned components excluding vulcanizing agents such as sulfur and vulcanization accelerators
  • a vulcanizing agent such as sulfur and a vulcanization accelerator are added to the obtained mixture.
  • a vulcanizing agent such as sulfur and a vulcanization accelerator are added to the obtained mixture.
  • kneading with a kneading roll machine or the like.
  • the vulcanization conditions are not particularly limited.
  • vulcanization can be performed by heating and pressurizing under conditions of 140 to 160 ° C.
  • composition of the present invention can be used as a rubber composition for producing a conveyor belt.
  • the conveyor belt of this invention is a conveyor belt which uses the rubber composition for conveyor belts of this invention.
  • the conveyor belt of the present invention is not particularly limited except that the composition of the present invention is used.
  • Examples of the form of the conveyor belt of the present invention include a conveyor belt that includes an upper surface cover rubber layer, a lower surface cover rubber layer, and a reinforcing layer, and has a reinforcing layer between the upper surface cover rubber layer and the lower surface cover rubber layer.
  • the composition of the present invention can be used for any of the upper cover rubber layer, the lower cover rubber layer, and the reinforcing layer. Especially, it is preferable to use the composition of this invention for an upper surface cover rubber layer.
  • FIG. 1 is a cross-sectional view schematically showing an example of a preferred embodiment of the conveyor belt of the present invention.
  • the conveyor belt 1 has the upper surface cover rubber layer 2, the reinforcement layer 3, and the lower surface cover rubber layer 4, and is laminated
  • the surface of the upper cover rubber layer 2 serves as a transported material transport surface 5.
  • the top cover rubber layer 2 is preferably formed using the composition of the present invention.
  • the top cover rubber layer has two or more layers
  • at least one or all of the two or more layers can be formed using the composition of the present invention.
  • the upper cover rubber layer 2 has an outer layer 11 and an inner layer 12.
  • the outer layer 11 and / or the inner layer 12 can be formed using the composition of the present invention, and at least the outer layer 11 is preferably formed using the composition of the present invention.
  • the inner layer 12 can be a layer for bonding the reinforcing layer 3 and the outer layer 11 together.
  • the rubber composition used for the bottom cover rubber layer is not particularly limited.
  • the bottom cover rubber layer 4 has an outer layer 16 and an inner layer 15.
  • the outer layer 16 and the inner layer 15 may be formed using the same or different rubber composition.
  • the reinforcing layer is not particularly limited, and those used for ordinary conveyor belts can be appropriately selected and used.
  • shape of a reinforcement layer is not specifically limited, For example, a sheet form may be sufficient as shown in FIG. Moreover, you may embed a wire-shaped reinforcement wire in parallel in a reinforcement layer (not shown).
  • the thickness of the upper cover rubber layer is preferably 3 to 25 mm.
  • the thickness of the bottom cover rubber layer is preferably 3 to 20 mm, and more preferably 5 to 15 mm.
  • the thickness of the upper cover rubber layer can be the sum of the thicknesses of these layers. The same applies to the thickness of the bottom cover rubber layer.
  • the conveyor belt of the present invention is not particularly limited for its production. For example, a conventionally well-known thing is mentioned.
  • the conveyor belt of the present invention can be used, for example, to convey limestone.
  • compositions were produced using the components shown in Table 2 below with the compositions (parts by mass) shown in Table 1 below. Specifically, the components shown in Table 1 below, excluding sulfur and vulcanization accelerator, are mixed for 5 minutes with a Banbury mixer, and then sulfur and vulcanization accelerator are added to the resulting mixture. These were mixed using a roll to produce a composition.
  • vulcanized rubber sheet for evaluation The composition (unvulcanized) produced as described above was formed into a sheet, and heated and vulcanized at 148 ° C. for 30 minutes (40 minutes for a cut-resistant test piece) to prepare a vulcanized rubber sheet.
  • ⁇ Evaluation> The following evaluation was performed using the vulcanized rubber sheet produced as described above. The results are shown in Table 1.
  • ⁇ Abrasion resistance (DIN abrasion test) In accordance with the method described in DIN 53516, a DIN abrasion test was performed using a DIN abrasion tester at room temperature, and the abrasion volume (DIN abrasion) of the vulcanized rubber sheet was measured. The ratio (volume%) of the abrasion volume measured as described above to the volume of the vulcanized rubber sheet used in the DIN abrasion test is shown as a result of abrasion resistance. When the said ratio is 25 volume% or less, it is excellent in abrasion resistance.
  • Cut resistance To the vulcanized rubber sheet (length 100 mm ⁇ width 20 mm ⁇ height 40 mm) produced as described above, at room temperature, from 25 cm above the vulcanized rubber sheet, blade (blade width 100 mm, blade edge 2 mm part) The tip angle of 20 ° and the weight of 8 kg was naturally dropped onto the vulcanized rubber sheet, and the depth (mm) of cracks generated in the vulcanized rubber sheet was measured. When the depth is 10 mm or less, the cut resistance is excellent.
  • Comparative Example 1 containing a polybutadiene rubber having a Mooney viscosity and a weight average molecular weight outside the predetermined ranges and having a carbon black amount less than the predetermined range is wear resistance and cut resistance.
  • Comparative Example 2 in which the carbon black content was increased as compared with Comparative Example 1, the cut resistance was low.
  • Comparative Examples 3 and 7 having a sulfur content greater than the predetermined range had low wear resistance and cut resistance.
  • Comparative Example 4 containing polybutadiene rubber having a Mooney viscosity outside the predetermined range and carbon black having a nitrogen adsorption specific surface area outside the predetermined range and having a sulfur content exceeding the predetermined range has wear resistance and cut resistance. It was low.
  • Comparative Example 5 containing a polybutadiene rubber having a Mooney viscosity outside the predetermined range had low cut resistance. Comparative Example 6 containing carbon black having a nitrogen adsorption specific surface area outside the predetermined range had low wear resistance and cut resistance.
  • Examples 1 to 3 were excellent in wear resistance and cut resistance. Further, when Examples 1 and 2 are compared, Example 2 is superior to Example 1 due to the predetermined effect. From this, when the weight average molecular weight of the polybutadiene rubber is 6.0 ⁇ 10 5 to 10.0 ⁇ 10 5 , the Mooney viscosity is 55 to 100, or the polybutadiene rubber manufactured using a neodymium catalyst is used. In some cases, it was found that the wear resistance and cut resistance were superior. Further, when Examples 2 and 3 were compared, Example 3 was more excellent in abrasion resistance than Example 2.

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Abstract

The purpose of the present invention is to provide: a rubber composition for conveyor belts, which has excellent wear resistance and excellent cutting resistance; and a conveyor belt which uses this rubber composition for conveyor belts. The present invention provides: a rubber composition for conveyor belts, which contains 45-70 parts by mass of a carbon black that has a nitrogen adsorption specific surface area of 115-160 m2/g and a dibutyl phthalate oil absorption of 115-140 ml/100 g and 0.3 part by mass or more but less than 2.0 parts by mass of sulfur per 100 parts by mass of a rubber component that contains 20-80% by mass of a polybutadiene rubber that has a Mooney viscosity at 100°C of 50-100 and a weight average molecular weight of from 5.1 × 105 to 10.0 × 105; and a conveyor belt which uses this rubber composition for conveyor belts.

Description

コンベアベルト用ゴム組成物、及びこれを用いるコンベアベルトRubber composition for conveyor belt and conveyor belt using the same
　本発明はコンベアベルト用ゴム組成物、及びこれを用いるコンベアベルトに関する。 The present invention relates to a rubber composition for a conveyor belt and a conveyor belt using the same.
　近年、コンベアベルトには、環境に配慮する観点から長寿命であることが要求されている。このような問題に対して、従来、ベルトコンベアの耐摩耗寿命の向上を目的とするゴム組成物が提案されている。例えば、特許文献１には、ゴム成分として、ネオジウム系触媒により合成したポリブタジエンゴムを含むことを特徴とするベルトコンベアのベルト用ゴム組成物が記載されている（請求項１）。また、特許文献１の実施例では、ポリブタジエンゴム等を含むゴム成分に対し、カーボンブラック、硫黄等を配合したゴム組成物が記載されている。 In recent years, conveyor belts are required to have a long service life from the viewpoint of environmental considerations. In order to solve such a problem, conventionally, a rubber composition for the purpose of improving the wear resistance life of the belt conveyor has been proposed. For example, Patent Document 1 describes a rubber composition for a belt of a belt conveyor characterized by containing, as a rubber component, polybutadiene rubber synthesized with a neodymium-based catalyst (Claim 1). Moreover, in the Example of patent document 1, the rubber composition which mix | blended carbon black, sulfur, etc. with the rubber component containing polybutadiene rubber etc. is described.
特開２００３－１０５１３６号公報JP 2003-105136 A
　コンベアベルトのカバーゴム（特に上面カバーゴム。以下同様。）は、搭載する被輸送物との摩擦によって摩耗し易く、耐摩耗性が要求される。これと同時に、コンベアベルトは鋭利部を有する物を搬送する場合もあるため、そのカバーゴムには傷付き難い（耐カット性が高い）ことも要求される。これらの性能全てに優れることが、カバーベルトの長寿命化につながると本発明者らは考える。
　このようななか、本発明者らは特許文献１をもとにゴム組成物を調製したところ、このようなゴム組成物が昨今要求されている、耐摩耗性、耐カット性を満足しない場合があることが明らかとなった。
　そこで、本発明は、耐摩耗性、耐カット性に優れるコンベアベルト用ゴム組成物、これを用いるコンベアベルトを提供することを目的とする。 The conveyor belt cover rubber (especially the upper surface cover rubber; the same applies hereinafter) is easily worn by friction with the object to be mounted, and wear resistance is required. At the same time, since the conveyor belt may convey an object having a sharp portion, the cover rubber is also required to be hardly damaged (high cut resistance). The present inventors consider that excellent in all of these performances leads to a longer life of the cover belt.
Under these circumstances, when the present inventors prepared a rubber composition based on Patent Document 1, there is a case where such a rubber composition does not satisfy the wear resistance and the cut resistance which are required recently. It became clear.
Then, an object of this invention is to provide the rubber composition for conveyor belts which is excellent in abrasion resistance and cut resistance, and a conveyor belt using the same.
　本発明者らは、上記課題を解決すべく鋭意研究した結果、ポリブタジエンゴムの、１００℃でのムーニー粘度及び重量平均分子量が特定の範囲であり、カーボンブラックの窒素吸着比表面積及びジブチルフタレート吸油量が特定の範囲であり、硫黄の含有量が特定の範囲であることによって、所定の効果が得られることを見出し、本発明に至った。
　本発明は上記知見等に基づくものであり、具体的には以下の構成により上記課題を解決するものである。 As a result of diligent research to solve the above-mentioned problems, the present inventors have found that polybutadiene rubber has a Mooney viscosity and a weight average molecular weight at 100 ° C. in a specific range, a nitrogen adsorption specific surface area and a dibutyl phthalate oil absorption amount of carbon black. Is a specific range, and when the sulfur content is within a specific range, the inventors have found that a predetermined effect can be obtained, and have reached the present invention.
The present invention is based on the above knowledge and the like, and specifically, solves the above problems by the following configuration.
　１．　１００℃でのムーニー粘度が５０～１００であり重量平均分子量が５．１×１０5～１０．０×１０5であるポリブタジエンゴムを２０～８０質量％含むゴム成分１００質量部に対して、
　窒素吸着比表面積が１１５～１６０ｍ2／ｇであり、ジブチルフタレート吸油量が１１５～１４０ｍＬ／１００ｇであるカーボンブラックを４５～７０質量部と、
　硫黄０．３質量部以上２．０質量部未満とを含有する、コンベアベルト用ゴム組成物。
　２．　前記重量平均分子量が、５．５×１０5～９．０×１０5である、上記１に記載のコンベアベルト用ゴム組成物。
　３．　前記ポリブタジエンゴムが、ネオジウム系触媒により合成される、上記１又は２に記載のコンベアベルト用ゴム組成物。
　４．　上記１～３のいずれか１つに記載のコンベアベルト用ゴム組成物を使用するコンベアベルト。
　５．　前記コンベアベルト用ゴム組成物を上面カバーゴムに使用する上記４に記載のコンベアベルト。 1. With respect to 100 parts by mass of a rubber component containing 20 to 80% by mass of a polybutadiene rubber having a Mooney viscosity at 100 ° C. of 50 to 100 and a weight average molecular weight of 5.1 × 10 5 to 10.0 × 10 5 ,
45 to 70 parts by mass of carbon black having a nitrogen adsorption specific surface area of 115 to 160 m 2 / g and a dibutyl phthalate oil absorption of 115 to 140 mL / 100 g;
A rubber composition for a conveyor belt, comprising 0.3 parts by mass or more and less than 2.0 parts by mass of sulfur.
2. 2. The rubber composition for conveyor belts according to 1 above, wherein the weight average molecular weight is 5.5 × 10 5 to 9.0 × 10 5 .
3. The rubber composition for conveyor belts according to 1 or 2 above, wherein the polybutadiene rubber is synthesized by a neodymium catalyst.
4). A conveyor belt using the rubber composition for a conveyor belt according to any one of 1 to 3 above.
5. 5. The conveyor belt according to 4 above, wherein the rubber composition for a conveyor belt is used for a top cover rubber.
　本発明によれば、耐摩耗性、耐カット性に優れるコンベアベルト用ゴム組成物、これを用いるコンベアベルトを提供することができる。 According to the present invention, it is possible to provide a rubber composition for conveyor belts excellent in wear resistance and cut resistance, and a conveyor belt using the same.
図１は、本発明のコンベアベルトの好適な実施態様の一例を模式的に示した断面図である。FIG. 1 is a cross-sectional view schematically showing an example of a preferred embodiment of the conveyor belt of the present invention.
　本発明について以下詳細に説明する。
　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。
　また、本明細書において、成分が２種以上の物質を含む場合、上記成分の含有量とは、２種以上の物質の合計の含有量を指す。 The present invention will be described in detail below.
In this specification, a numerical range expressed using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value.
Moreover, in this specification, when a component contains 2 or more types of substances, content of the said component refers to the total content of 2 or more types of substances.
［ゴム組成物］
　本発明のコンベアベルト用ゴム組成物（本発明の組成物）は、
　１００℃でのムーニー粘度が５０～１００であり重量平均分子量が５．１×１０5～１０．０×１０5であるポリブタジエンゴムを２０～８０質量％含むゴム成分１００質量部に対して、
　窒素吸着比表面積が１１５～１６０ｍ2／ｇであり、ジブチルフタレート吸油量が１１５～１４０ｍＬ／１００ｇであるカーボンブラックを４５～７０質量部と、
　硫黄０．３質量部以上２．０質量部未満とを含有する、コンベアベルト用ゴム組成物である。 [Rubber composition]
The rubber composition for conveyor belts of the present invention (the composition of the present invention)
With respect to 100 parts by mass of a rubber component containing 20 to 80% by mass of a polybutadiene rubber having a Mooney viscosity at 100 ° C. of 50 to 100 and a weight average molecular weight of 5.1 × 10 5 to 10.0 × 10 5 ,
45 to 70 parts by mass of carbon black having a nitrogen adsorption specific surface area of 115 to 160 m 2 / g and a dibutyl phthalate oil absorption of 115 to 140 mL / 100 g;
It is a rubber composition for conveyor belts containing 0.3 parts by mass or more and less than 2.0 parts by mass of sulfur.
　本発明の組成物はこのような構成をとるため、所望の効果が得られるものと考えられる。その理由は明らかではないが、およそ以下のとおりと推測される。
　本発明において、ポリブタジエンゴムの重量平均分子量は比較的大きく、このようなポリブタジエンゴムはカーボンブラックの分散性が低いと考えられる。上記の問題点に対して、窒素吸着比表面積及びジブチルフタレート吸油量が大きい、つまりカーボンブラックを構成する基本粒子の粒径が非常に小さく、カーボンブラックがハイストラクチャーである（アグリゲートの凝集構造が発達している）ことによって、高分子量のポリブタジエンゴムに対するカーボンブラックの分散性、ゴム組成物の加工性が向上し、所定の効果が得られるようになったと本発明者らは推察する。
　また、硫黄の含有量が所定の範囲であることによって、上記ポリブタジエンゴムの加硫の程度が適切となり、所定の効果が得られるようになったと本発明者らは推察する。 Since the composition of this invention takes such a structure, it is thought that a desired effect is acquired. The reason is not clear, but it is presumed that it is as follows.
In the present invention, the polybutadiene rubber has a relatively large weight average molecular weight, and such a polybutadiene rubber is considered to have low dispersibility of carbon black. In response to the above problems, the nitrogen adsorption specific surface area and dibutyl phthalate oil absorption are large, that is, the particle size of the basic particles constituting the carbon black is very small, and the carbon black has a high structure (the aggregate structure of the aggregate is The present inventors speculate that the dispersibility of carbon black with respect to high molecular weight polybutadiene rubber and the processability of the rubber composition are improved, and a predetermined effect can be obtained.
Further, the inventors speculate that the degree of vulcanization of the polybutadiene rubber becomes appropriate and the predetermined effect can be obtained when the sulfur content is within the predetermined range.
　以下、本発明の組成物に含有される各成分について詳述する。
＜ゴム成分＞
　本発明の組成物は、ゴム成分を含有し、ゴム成分は所定のポリブタジエンゴムを含む。 Hereinafter, each component contained in the composition of this invention is explained in full detail.
<Rubber component>
The composition of the present invention contains a rubber component, and the rubber component contains a predetermined polybutadiene rubber.
（ポリブタジエンゴム）
　本発明の組成物に使用されるポリブタジエンゴムは、１００℃でのムーニー粘度（ＭＬ1+4＠１００℃）が５０～１００であり、重量平均分子量が５．１×１０5～１０．０×１０5である。
　上記ポリブタジエンゴムのムーニー粘度（ＭＬ1+4＠１００℃）は、５０～９０であるのが好ましく、５０～８０であるのがより好ましい。
　本発明において、ポリブタジエンゴムのムーニー粘度は、ＪＩＳ　Ｋ　６３００－１：２００１に記載の方法に準拠して、１００℃の条件下で測定された。 (Polybutadiene rubber)
The polybutadiene rubber used in the composition of the present invention has a Mooney viscosity (ML 1 + 4 @ 100 ° C.) at 100 ° C. of 50 to 100, and a weight average molecular weight of 5.1 × 10 5 to 10.0 ×. 10 5 .
The Mooney viscosity (ML 1 + 4 @ 100 ° C.) of the polybutadiene rubber is preferably 50 to 90, and more preferably 50 to 80.
In the present invention, the Mooney viscosity of the polybutadiene rubber was measured under the condition of 100 ° C. according to the method described in JIS K 6300-1: 2001.
　上記ポリブタジエンゴムの重量平均分子量は、５．５×１０5～９．０×１０5であるのが好ましく、５．５×１０5～８．０×１０5であるのがより好ましい。
　本発明において、ポリブタジエンゴムの重量平均分子量は、シクロヘキサンを溶媒とするゲルパーミエーションクロマトグラフィー（ＧＰＣ）による測定値をもとにした標準ポリスチレン換算値である。 The weight average molecular weight of the polybutadiene rubber is preferably 5.5 × 10 5 to 9.0 × 10 5 , and more preferably 5.5 × 10 5 to 8.0 × 10 5 .
In the present invention, the weight average molecular weight of the polybutadiene rubber is a standard polystyrene equivalent value based on a value measured by gel permeation chromatography (GPC) using cyclohexane as a solvent.
　ポリブタジエンゴムの製造方法としては、ブタジエンを、例えばコバルト系触媒及び／又はネオジウム系触媒のような触媒を用いて重合することによって合成する方法が挙げられる。コバルト系触媒、ネオジウム系触媒は特に制限されない。コバルト系触媒はコバルトを有する化合物とすることができる。ネオジウム系触媒はネオジウム（Ｎｄ）を有する化合物とすることができる。なかでも、ネオジウム系触媒が好ましい。
　ポリブタジエンゴムはそれぞれ単独でまたは２種以上を組み合わせて使用することができる。 Examples of the method for producing polybutadiene rubber include a method of synthesizing butadiene by polymerizing butadiene using a catalyst such as a cobalt-based catalyst and / or a neodymium-based catalyst. The cobalt-based catalyst and neodymium-based catalyst are not particularly limited. The cobalt-based catalyst can be a compound having cobalt. The neodymium catalyst can be a compound having neodymium (Nd). Of these, neodymium catalysts are preferable.
The polybutadiene rubbers can be used alone or in combination of two or more.
（ポリブタジエンゴム以外のゴム）
　本発明において、ゴム成分が上記ポリブタジエンゴム以外に含むことができるゴムは特に制限されない。例えば、ジエン系ゴムが挙げられる。具体的には例えば、天然ゴム（ＮＲ）、イソプレンゴム（ＩＲ）、上記以外のポリブタジエンゴム（ＢＲ）、芳香族ビニル－共役ジエン共重合体ゴム（例えばスチレンブタジエンゴム（ＳＢＲ））、ニトリルブタジエンゴム（ＮＢＲ、アクリロニトリルブタジエンゴム）、ブチルゴム（ＩＩＲ）、ハロゲン化ブチルゴム（例えば、Ｂｒ－ＩＩＲ、Ｃｌ－ＩＩＲ）、クロロプレンゴム（ＣＲ）などが挙げられる。なかでも、天然ゴム、スチレンブタジエンゴムが好ましい。
　ゴム成分が上記ポリブタジエンゴム以外に含むことができるゴムはそれぞれ単独でまたは２種以上を組み合わせて使用することができる。 (Rubbers other than polybutadiene rubber)
In the present invention, the rubber that the rubber component can contain other than the polybutadiene rubber is not particularly limited. An example is diene rubber. Specifically, for example, natural rubber (NR), isoprene rubber (IR), polybutadiene rubber (BR) other than the above, aromatic vinyl-conjugated diene copolymer rubber (for example, styrene butadiene rubber (SBR)), nitrile butadiene rubber (NBR, acrylonitrile butadiene rubber), butyl rubber (IIR), halogenated butyl rubber (for example, Br-IIR, Cl-IIR), chloroprene rubber (CR) and the like. Of these, natural rubber and styrene butadiene rubber are preferable.
The rubber components that the rubber component can contain other than the polybutadiene rubber can be used alone or in combination of two or more.
　本発明において、ゴム成分中におけるポリブタジエンゴムの割合は２０～８０質量％である。ポリブタジエンゴムの割合は、３０～７０質量％であるのが好ましく、４０～６０質量％であるのがより好ましい。上記割合の残りを、ゴム成分が上記ポリブタジエンゴム以外に含むことができるゴムとすることができる。 In the present invention, the proportion of the polybutadiene rubber in the rubber component is 20 to 80% by mass. The proportion of the polybutadiene rubber is preferably 30 to 70% by mass, and more preferably 40 to 60% by mass. The remainder of the above ratio can be a rubber whose rubber component can be contained in addition to the polybutadiene rubber.
＜カーボンブラック＞
　本発明の組成物に含有されるカーボンブラックは、その窒素吸着比表面積が１１５～１６０ｍ2／ｇであり、ジブチルフタレート吸油量が１１５～１４０ｍＬ／１００ｇである。
　カーボンブラックの窒素吸着比表面積（Ｎ2ＳＡ）は、１２０～１５５ｍ2／ｇであるのが好ましく、１２０～１４５ｍ2／ｇであるのがより好ましく、１２０～１４０ｍ2／ｇであるのがさらに好ましい。
　本発明において、カーボンブラックの窒素吸着比表面積は、ＪＩＳ　Ｋ　６２１７－２：２００１に準じて測定された。 <Carbon black>
The carbon black contained in the composition of the present invention has a nitrogen adsorption specific surface area of 115 to 160 m 2 / g and a dibutyl phthalate oil absorption of 115 to 140 mL / 100 g.
The nitrogen adsorption specific surface area (N 2 SA) of carbon black is preferably 120 to 155 m 2 / g, more preferably 120 to 145 m 2 / g, and further preferably 120 to 140 m 2 / g. preferable.
In the present invention, the nitrogen adsorption specific surface area of carbon black was measured according to JIS K 6217-2: 2001.
　カーボンブラックのジブチルフタレート吸油量（ＤＢＰ吸油量）は、１１５～１３０ｍＬ／１００ｇであるのが好ましく、１１６～１３０ｍＬ／１００ｇであるのがより好ましく、１２０～１３０ｍＬ／１００ｇであるのがさらに好ましい。
　本発明において、ジブチルフタレート吸油量は、ＪＩＳ　Ｋ　６２１７－４：２００８に準じて測定された。 Carbon black has a dibutyl phthalate oil absorption (DBP oil absorption) of preferably 115 to 130 mL / 100 g, more preferably 116 to 130 mL / 100 g, and still more preferably 120 to 130 mL / 100 g.
In the present invention, the oil absorption of dibutyl phthalate was measured according to JIS K 6217-4: 2008.
　具体的なカーボンブラックとしては、例えば、ＳＡＦ、ＩＳＡＦ－ＨＳが挙げられる。
　カーボンブラックはそれぞれ単独でまたは２種以上を組み合わせて使用することができる。 Specific examples of carbon black include SAF and ISAF-HS.
Carbon blacks can be used alone or in combination of two or more.
　本発明において、カーボンブラックの含有量は、ゴム成分１００質量部に対して４５～７０質量部であり、４５～６５質量部であるのが好ましく、４５～５５質量部であるのがより好ましい。 In the present invention, the content of carbon black is 45 to 70 parts by weight, preferably 45 to 65 parts by weight, and more preferably 45 to 55 parts by weight with respect to 100 parts by weight of the rubber component.
＜硫黄＞
　本発明の組成物に含有される硫黄は特に制限されない。例えば、従来公知のものが挙げられる。
　本発明において、硫黄の含有量は、ゴム成分１００質量部に対して０．３質量部以上２．０質量部未満であり、０．８～１．５質量部であるのが好ましく、１～１．５質量部であるのがより好ましい。 <Sulfur>
The sulfur contained in the composition of the present invention is not particularly limited. For example, a conventionally well-known thing is mentioned.
In the present invention, the sulfur content is 0.3 parts by mass or more and less than 2.0 parts by mass, preferably 0.8 to 1.5 parts by mass, with respect to 100 parts by mass of the rubber component. More preferably, it is 1.5 parts by mass.
＜添加剤＞
　本発明の組成物は、上述した各成分以外に、本発明の効果、目的を損わない範囲で、更に添加剤を含有することができる。添加剤としては、例えば、所定のカーボンブラック以外のカーボンブラック、老化防止剤６Ｃのような老化防止剤、酸化亜鉛、ステアリン酸、加工助剤、パラフィンワックス、アロマオイル、液状ポリマー、テルペン系樹脂、熱硬化性樹脂、硫黄以外の加硫剤、加硫助剤、加硫促進剤、加硫遅延剤が挙げられる。 <Additives>
The composition of the present invention can further contain additives in addition to the above-described components as long as the effects and objects of the present invention are not impaired. Examples of additives include carbon blacks other than predetermined carbon black, anti-aging agents such as anti-aging agent 6C, zinc oxide, stearic acid, processing aids, paraffin wax, aroma oil, liquid polymer, terpene resin, Examples thereof include thermosetting resins, vulcanizing agents other than sulfur, vulcanization aids, vulcanization accelerators, and vulcanization retarders.
　本発明の組成物はその製造について特に制限されない。例えば、上述した各成分（硫黄等の加硫剤、加硫促進剤を除く。）をバンバリーミキサー等で混練し、ついで、得られた混合物に硫黄などの加硫剤、加硫促進剤を加えて混練ロール機等で混練することによって製造することができる。
　また、加硫の条件は特に制限されない。例えば、１４０～１６０℃の条件下で加熱し、加圧することによって加硫を行うことができる。 The composition of the present invention is not particularly limited for its production. For example, the above-mentioned components (excluding vulcanizing agents such as sulfur and vulcanization accelerators) are kneaded with a Banbury mixer etc., and then a vulcanizing agent such as sulfur and a vulcanization accelerator are added to the obtained mixture. And kneading with a kneading roll machine or the like.
Further, the vulcanization conditions are not particularly limited. For example, vulcanization can be performed by heating and pressurizing under conditions of 140 to 160 ° C.
　本発明の組成物は、コンベアベルトを製造するためのゴム組成物として使用することができる。 The composition of the present invention can be used as a rubber composition for producing a conveyor belt.
［コンベアベルト］
　本発明のコンベアベルトは、本発明のコンベアベルト用ゴム組成物を使用するコンベアベルトである。本発明のコンベアベルトは本発明の組成物を使用する以外特に制限されない。 [Conveyor belt]
The conveyor belt of this invention is a conveyor belt which uses the rubber composition for conveyor belts of this invention. The conveyor belt of the present invention is not particularly limited except that the composition of the present invention is used.
　本発明のコンベアベルトの形態としては、例えば、上面カバーゴム層と下面カバーゴム層と補強層とを備え、上面カバーゴム層と下面カバーゴム層との間に補強層を有するコンベアベルトが挙げられる。
　本発明の組成物は、上面カバーゴム層、下面カバーゴム層、補強層のいずれにも使用することができる。なかでも、本発明の組成物を上面カバーゴム層に使用するのが好ましい。 Examples of the form of the conveyor belt of the present invention include a conveyor belt that includes an upper surface cover rubber layer, a lower surface cover rubber layer, and a reinforcing layer, and has a reinforcing layer between the upper surface cover rubber layer and the lower surface cover rubber layer. .
The composition of the present invention can be used for any of the upper cover rubber layer, the lower cover rubber layer, and the reinforcing layer. Especially, it is preferable to use the composition of this invention for an upper surface cover rubber layer.
　以下、本発明のコンベアベルトを添付の図面を用いて説明する。なお本発明は添付の図面に制限されない。
　図１は、本発明のコンベアベルトの好適な実施態様の一例を模式的に示した断面図である。
　図１において、コンベアベルト１は、上面カバーゴム層２、補強層３及び下面カバーゴム層４を有し、この順で積層されている。上面カバーゴム層２の表面は運搬物搬送面５となる。上面カバーゴム層２が本発明の組成物を用いて形成されるのが好ましい。 Hereinafter, a conveyor belt according to the present invention will be described with reference to the accompanying drawings. The present invention is not limited to the attached drawings.
FIG. 1 is a cross-sectional view schematically showing an example of a preferred embodiment of the conveyor belt of the present invention.
In FIG. 1, the conveyor belt 1 has the upper surface cover rubber layer 2, the reinforcement layer 3, and the lower surface cover rubber layer 4, and is laminated | stacked in this order. The surface of the upper cover rubber layer 2 serves as a transported material transport surface 5. The top cover rubber layer 2 is preferably formed using the composition of the present invention.
　図１に示すように、上面カバーゴム層が２層以上の層を有する場合、当該２層以上の層のうち少なくとも１層又は全部の層を本発明の組成物を用いて形成することができる。また、少なくとも最外層を本発明の組成物を用いて形成するのが好ましい。
　図１において、上面カバーゴム層２は、外層１１および内層１２を有する。外層１１及び／又は内層１２を本発明の組成物を用いて形成することができ、少なくとも外層１１を本発明の組成物を用いて形成するのが好ましい。
　外層１１を本発明の組成物を用いて形成する場合、内層１２を補強層３および外層１１を接着させるための層とすることができる。 As shown in FIG. 1, when the top cover rubber layer has two or more layers, at least one or all of the two or more layers can be formed using the composition of the present invention. . Moreover, it is preferable to form at least the outermost layer using the composition of the present invention.
In FIG. 1, the upper cover rubber layer 2 has an outer layer 11 and an inner layer 12. The outer layer 11 and / or the inner layer 12 can be formed using the composition of the present invention, and at least the outer layer 11 is preferably formed using the composition of the present invention.
When the outer layer 11 is formed using the composition of the present invention, the inner layer 12 can be a layer for bonding the reinforcing layer 3 and the outer layer 11 together.
　下面カバーゴム層に使用されるゴム組成物は特に制限されない。
　下面カバーゴム層４は、外層１６はおよび内層１５を有する。外層１６と内層１５は同じ又は異なるゴム組成物を用いて形成されていてもよい。 The rubber composition used for the bottom cover rubber layer is not particularly limited.
The bottom cover rubber layer 4 has an outer layer 16 and an inner layer 15. The outer layer 16 and the inner layer 15 may be formed using the same or different rubber composition.
　補強層は特に限定されず、通常のコンベアベルトに用いられるものを適宜選択して用いることができる。また、補強層の形状は特に限定されず、例えば図１に示すようにシート状であってもよい。また、補強層内にワイヤー状の補強線を並列に埋込むものであってもよい（図示せず）。 The reinforcing layer is not particularly limited, and those used for ordinary conveyor belts can be appropriately selected and used. Moreover, the shape of a reinforcement layer is not specifically limited, For example, a sheet form may be sufficient as shown in FIG. Moreover, you may embed a wire-shaped reinforcement wire in parallel in a reinforcement layer (not shown).
　上面カバーゴム層の厚さは、３～２５ｍｍであるのが好ましい。下面カバーゴム層の厚さは、３～２０ｍｍであるのが好ましく、５～１５ｍｍであるのがより好ましい。なお、上面カバーゴム層が２層以上で構成されている場合、上面カバーゴム層の厚さは、これらの層の厚さの合計とすることができる。下面カバーゴム層の厚さも同様である。 The thickness of the upper cover rubber layer is preferably 3 to 25 mm. The thickness of the bottom cover rubber layer is preferably 3 to 20 mm, and more preferably 5 to 15 mm. When the upper cover rubber layer is composed of two or more layers, the thickness of the upper cover rubber layer can be the sum of the thicknesses of these layers. The same applies to the thickness of the bottom cover rubber layer.
　本発明のコンベアベルトはその製造について特に制限されない。例えば、従来公知のものが挙げられる。
　本発明のコンベアベルトは、例えば、石灰石を搬送するために使用することができる。 The conveyor belt of the present invention is not particularly limited for its production. For example, a conventionally well-known thing is mentioned.
The conveyor belt of the present invention can be used, for example, to convey limestone.
　以下に実施例を示して本発明を具体的に説明する。ただし本発明はこれらに限定されない。
＜組成物の製造＞
　下記第１表に示す組成（質量部）で下記第２表に示す成分を用いて組成物を製造した。具体的にはまず、下記第１表に示す成分のうち硫黄および加硫促進剤を除く成分を、バンバリーミキサーで５分間混合し、次に、得られた混合物に硫黄および加硫促進剤を加えてこれらをロールを用いて混合して、組成物を製造した。 The present invention will be specifically described below with reference to examples. However, the present invention is not limited to these.
<Production of composition>
Compositions were produced using the components shown in Table 2 below with the compositions (parts by mass) shown in Table 1 below. Specifically, the components shown in Table 1 below, excluding sulfur and vulcanization accelerator, are mixed for 5 minutes with a Banbury mixer, and then sulfur and vulcanization accelerator are added to the resulting mixture. These were mixed using a roll to produce a composition.
＜評価用加硫ゴムシートの作製＞
　上記のとおり製造した組成物（未加硫）をシート状に成形し、１４８℃、３０分（耐カット性用の試験片では４０分）加熱加硫して、加硫ゴムシートを作製した。 <Preparation of vulcanized rubber sheet for evaluation>
The composition (unvulcanized) produced as described above was formed into a sheet, and heated and vulcanized at 148 ° C. for 30 minutes (40 minutes for a cut-resistant test piece) to prepare a vulcanized rubber sheet.
＜評価＞
　上記のとおり作製した加硫ゴムシートを用いて以下の評価を行った。結果を第１表に示す。
・耐摩耗性（ＤＩＮ摩耗試験）
　ＤＩＮ５３５１６に記載の方法に準拠し、ＤＩＮ摩耗試験機を用いて室温の条件下でＤＩＮ摩耗試験を行い、上記加硫ゴムシートの摩耗体積（ＤＩＮ摩耗）を測定した。
　ＤＩＮ摩耗試験に使用された加硫ゴムシートの体積に対する、上記のとおり測定された摩耗体積の比率（体積％）を耐摩耗性の結果として示した。
　上記比率が２５体積％以下である場合、耐摩耗性に優れる。 <Evaluation>
The following evaluation was performed using the vulcanized rubber sheet produced as described above. The results are shown in Table 1.
・ Abrasion resistance (DIN abrasion test)
In accordance with the method described in DIN 53516, a DIN abrasion test was performed using a DIN abrasion tester at room temperature, and the abrasion volume (DIN abrasion) of the vulcanized rubber sheet was measured.
The ratio (volume%) of the abrasion volume measured as described above to the volume of the vulcanized rubber sheet used in the DIN abrasion test is shown as a result of abrasion resistance.
When the said ratio is 25 volume% or less, it is excellent in abrasion resistance.
・耐カット性
　上記のとおり作製した加硫ゴムシート（縦１００ｍｍ×横２０ｍｍ×高さ４０ｍｍ）に対して、室温にて、上記加硫ゴムシートの２５ｃｍ上から、刃（刃渡り１００ｍｍ、刃先２ｍｍ部の先端角度２０°、重さ８ｋｇ）を上記加硫ゴムシートへ自然落下させ、加硫ゴムシートに生じた亀裂の深さ（ｍｍ）を測定した。
　上記深さが１０ｍｍ以下である場合、耐カット性に優れる。 Cut resistance To the vulcanized rubber sheet (length 100 mm × width 20 mm × height 40 mm) produced as described above, at room temperature, from 25 cm above the vulcanized rubber sheet, blade (blade width 100 mm, blade edge 2 mm part) The tip angle of 20 ° and the weight of 8 kg was naturally dropped onto the vulcanized rubber sheet, and the depth (mm) of cracks generated in the vulcanized rubber sheet was measured.
When the depth is 10 mm or less, the cut resistance is excellent.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
　第１表に示した各成分の詳細は以下のとおりである。
Figure JPOXMLDOC01-appb-T000003
 Details of each component shown in Table 1 are as follows.
Figure JPOXMLDOC01-appb-T000003
　第１表に示す結果から明らかなように、ムーニー粘度及び重量平均分子量が所定の範囲外のポリブタジエンゴムを含有し、カーボンブラックの量が所定より少ない比較例１は、耐摩耗性、耐カット性が低かった。
　比較例１よりもカーボンブラックの含有量を増やした比較例２は、耐カット性が低かった。
　硫黄の含有量が所定の範囲より多い比較例３、７は、耐摩耗性、耐カット性が低かった。
　ムーニー粘度が所定の範囲外のポリブタジエンゴム及び窒素吸着比表面積が所定の範囲外のカーボンブラックを含有し、硫黄の含有量が所定の範囲より多い比較例４は、耐摩耗性、耐カット性が低かった。
　ムーニー粘度が所定の範囲外のポリブタジエンゴムを含有する比較例５は、耐カット性が低かった。
　窒素吸着比表面積が所定の範囲外のカーボンブラックを含有する比較例６は、耐摩耗性、耐カット性が低かった。 As is apparent from the results shown in Table 1, Comparative Example 1 containing a polybutadiene rubber having a Mooney viscosity and a weight average molecular weight outside the predetermined ranges and having a carbon black amount less than the predetermined range is wear resistance and cut resistance. Was low.
In Comparative Example 2 in which the carbon black content was increased as compared with Comparative Example 1, the cut resistance was low.
Comparative Examples 3 and 7 having a sulfur content greater than the predetermined range had low wear resistance and cut resistance.
Comparative Example 4 containing polybutadiene rubber having a Mooney viscosity outside the predetermined range and carbon black having a nitrogen adsorption specific surface area outside the predetermined range and having a sulfur content exceeding the predetermined range has wear resistance and cut resistance. It was low.
Comparative Example 5 containing a polybutadiene rubber having a Mooney viscosity outside the predetermined range had low cut resistance.
Comparative Example 6 containing carbon black having a nitrogen adsorption specific surface area outside the predetermined range had low wear resistance and cut resistance.
　これに対して、実施例１～３は、耐摩耗性、耐カット性に優れた。
　また、実施例１、２を比較すると、実施例２は実施例１よりも所定の効果により優れた。このことから、ポリブタジエンゴムの重量平均分子量が６．０×１０5～１０．０×１０5である場合、ムーニー粘度が５５～１００である場合又はネオジウム系触媒を用いて製造されたポリブタジエンゴムである場合、耐摩耗性、耐カット性により優れることが分かった。
　また、実施例２、３を比較すると、実施例３は実施例２よりも耐摩耗性により優れた。このことから、カーボンブラックの窒素吸着比表面積が１２０～１４０ｍ2／ｇである場合及び／又はジブチルフタレート吸油量が１２０～１３０ｍＬ／１００ｇである場合、耐摩耗性により優れることが分かった。 In contrast, Examples 1 to 3 were excellent in wear resistance and cut resistance.
Further, when Examples 1 and 2 are compared, Example 2 is superior to Example 1 due to the predetermined effect. From this, when the weight average molecular weight of the polybutadiene rubber is 6.0 × 10 5 to 10.0 × 10 5 , the Mooney viscosity is 55 to 100, or the polybutadiene rubber manufactured using a neodymium catalyst is used. In some cases, it was found that the wear resistance and cut resistance were superior.
Further, when Examples 2 and 3 were compared, Example 3 was more excellent in abrasion resistance than Example 2. From this, it was found that when the nitrogen adsorption specific surface area of carbon black is 120 to 140 m 2 / g and / or the dibutyl phthalate oil absorption is 120 to 130 mL / 100 g, the wear resistance is more excellent.
　１：コンベアベルト
　２：上面カバーゴム層
　３：補強層
　４：下面カバーゴム層
　５：運搬物搬送面
　１１、１６：外層
　１２、１５：内層 1: Conveyor belt 2: Top cover rubber layer 3: Reinforcing layer 4: Bottom cover rubber layer 5: Transported material transport surface 11, 16: Outer layer 12, 15: Inner layer

Claims (5)

  1. 　１００℃でのムーニー粘度が５０～１００であり重量平均分子量が５．１×１０5～１０．０×１０5であるポリブタジエンゴムを２０～８０質量％含むゴム成分１００質量部に対して、
    　窒素吸着比表面積が１１５～１６０ｍ2／ｇであり、ジブチルフタレート吸油量が１１５～１４０ｍＬ／１００ｇであるカーボンブラックを４５～７０質量部と、
    　硫黄０．３質量部以上２．０質量部未満とを含有する、コンベアベルト用ゴム組成物。     With respect to 100 parts by mass of a rubber component containing 20 to 80% by mass of a polybutadiene rubber having a Mooney viscosity at 100 ° C. of 50 to 100 and a weight average molecular weight of 5.1 × 10 5 to 10.0 × 10 5 ,
    45 to 70 parts by mass of carbon black having a nitrogen adsorption specific surface area of 115 to 160 m 2 / g and a dibutyl phthalate oil absorption of 115 to 140 mL / 100 g;
    A rubber composition for a conveyor belt, comprising 0.3 parts by mass or more and less than 2.0 parts by mass of sulfur.
  2. 　前記重量平均分子量が、５．５×１０5～９．０×１０5である、請求項１に記載のコンベアベルト用ゴム組成物。 The rubber composition for a conveyor belt according to claim 1, wherein the weight average molecular weight is 5.5 × 10 5 to 9.0 × 10 5 .
  3. 　前記ポリブタジエンゴムが、ネオジウム系触媒により合成される、請求項１又は２に記載のコンベアベルト用ゴム組成物。 The rubber composition for a conveyor belt according to claim 1 or 2, wherein the polybutadiene rubber is synthesized by a neodymium catalyst.
  4. 　請求項１～３のいずれか１項に記載のコンベアベルト用ゴム組成物を使用するコンベアベルト。 A conveyor belt using the rubber composition for a conveyor belt according to any one of claims 1 to 3.
  5. 　前記コンベアベルト用ゴム組成物を上面カバーゴムに使用する請求項４に記載のコンベアベルト。 The conveyor belt according to claim 4, wherein the rubber composition for the conveyor belt is used for a top cover rubber.
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