JP2014181265A - Rubber composition for conveyor belt, conveyor belt and belt conveyor - Google Patents

Rubber composition for conveyor belt, conveyor belt and belt conveyor Download PDF

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JP2014181265A
JP2014181265A JP2013055609A JP2013055609A JP2014181265A JP 2014181265 A JP2014181265 A JP 2014181265A JP 2013055609 A JP2013055609 A JP 2013055609A JP 2013055609 A JP2013055609 A JP 2013055609A JP 2014181265 A JP2014181265 A JP 2014181265A
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rubber composition
rubber
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JP6073159B2 (en
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Hironori Nakano
宏規 中野
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Bridgestone Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a rubber composition for a conveyor belt good in processability and capable of providing high thermal aging resistance and abrasion resistance to a conveyor belt and a belt conveyor, and the conveyor belt and the belt conveyor excellent in thermal aging resistance and abrasion resistance.SOLUTION: There is provided a rubber composition for a conveyor belt containing an ethylene 1-octene copolymer and an ethylene propylene copolymer having the ethylene content of less than 60 mol% and liquid rubber, and the percentage of blended amount of the ethylene 1-octene copolymer to the total blended amount of the ethylene 1-octene copolymer and the ethylene propylene copolymer having the ethylene content of less than 60 mol% is 60 to 99 mass%.

Description

本発明は、コンベアベルト用ゴム組成物、コンベアベルト及びベルトコンベア装置に関する。   The present invention relates to a rubber composition for a conveyor belt, a conveyor belt, and a belt conveyor device.

鉄鋼、石炭、セメント等の様々な産業分野においては、物品の輸送手段としてベルトコンベア装置が用いられ、特に、例えばクリンカ等のように、150〜250℃程度の高温物品をベルトコンベア装置で搬送するケースも多い。このような状況を受け、メンテナンス作業の最小限化及び使用寿命の長期化を図るため、耐熱老化性の高いコンベアベルトが求められている。さらに、物品の輸送による摩耗の観点から、高い耐摩耗性をも有するコンベアベルトが求められている。   In various industrial fields such as steel, coal, cement and the like, a belt conveyor device is used as a means for transporting articles, and in particular, a high-temperature article of about 150 to 250 ° C. is conveyed by a belt conveyor apparatus, such as a clinker. There are many cases. Under such circumstances, a conveyor belt having high heat aging resistance is required in order to minimize maintenance work and extend the service life. Furthermore, from the viewpoint of wear due to transportation of articles, a conveyor belt having high wear resistance is also required.

これらの要求を満たすため、例えば特許文献1には、ポリマーとして、エチレン・1−オクテン共重合体とエチレン・プロピレン共重合体とを含有するゴム組成物を用いることにより、耐熱老化性、耐摩耗性、加工性等の要求性能に優れた耐熱ベルトが得られることが開示されている。   In order to satisfy these requirements, for example, in Patent Document 1, a rubber composition containing an ethylene / 1-octene copolymer and an ethylene / propylene copolymer is used as a polymer, thereby providing heat aging resistance and abrasion resistance. It is disclosed that a heat-resistant belt excellent in required performance such as property and workability can be obtained.

特開平11−246017号公報Japanese Patent Laid-Open No. 11-246017

しかしながら、近年、高温物品用のベルトコンベア装置の需要がますます増大していること、及びベルトコンベア装置の更なる高性能化が求められていること等を背景に、コンベアベルトにおける耐熱老化性、耐摩耗性、及び製造時の加工性の更なる向上が望まれている。   However, in recent years, against the background of increasing demand for belt conveyor devices for high-temperature articles and the need for higher performance of belt conveyor devices, heat aging resistance in conveyor belts, Further improvement in wear resistance and workability during production is desired.

そこで、本発明の目的は、上述の問題を解決するためのものであり、コンベアベルト及びベルトコンベア装置に高い耐熱老化性及び耐摩耗性をもたらすことができる加工性が良好なコンベアベルト用ゴム組成物、並びに、耐熱老化性及び耐摩耗性に優れたコンベアベルト及びベルトコンベア装置を提供することにある。   Accordingly, an object of the present invention is to solve the above-mentioned problems, and a rubber composition for a conveyor belt having good processability capable of bringing high heat aging resistance and wear resistance to a conveyor belt and a belt conveyor device. It is an object of the present invention to provide a conveyor belt and a belt conveyor device excellent in heat resistance, aging resistance and wear resistance.

本発明者は、上記目的を達成するために鋭意検討した結果、コンベアベルト用ゴム組成物に含まれるゴム成分として、特定の成分を特定の割合で配合することにより、当該ゴム組成物の加工性が高まると同時に、かかるゴム組成物を用いて製造したコンベアベルト及びベルトコンベア装置に高い耐熱老化性及び耐摩耗性をもたらすことができることを見出し、本発明を完成させるに至った。   As a result of intensive studies to achieve the above object, the present inventor, as a rubber component contained in the rubber composition for conveyor belts, by blending a specific component at a specific ratio, the processability of the rubber composition At the same time, the present inventors have found that high heat aging resistance and wear resistance can be brought to a conveyor belt and a belt conveyor apparatus manufactured using such a rubber composition, and have completed the present invention.

すなわち、本発明のコンベアベルト用ゴム組成物は、ゴム成分として、エチレン・1−オクテン共重合体と、エチレン含有量が60モル%未満であるエチレン・プロピレン共重合体と、液状ゴムとを含み、該エチレン・1−オクテン共重合体及びエチレン含有量が60モル%未満であるエチレン・プロピレン共重合体の総配合量に対するエチレン・1−オクテン共重合体の配合量の割合が60〜99質量%であることを特徴とする。上記割合が60〜99質量%であるコンベアベルト用ゴム組成物は、加工性が良好な上、これを用いて製造されるコンベアベルト及びベルトコンベア装置に高い耐熱老化性及び耐摩耗性をもたらすことができる。
なお、「液状ゴム」とは、24℃において液状を呈するゴム成分を指す。
That is, the rubber composition for conveyor belts of the present invention includes, as a rubber component, an ethylene / 1-octene copolymer, an ethylene / propylene copolymer having an ethylene content of less than 60 mol%, and a liquid rubber. The ratio of the blending amount of the ethylene / 1-octene copolymer to the total blending amount of the ethylene / 1-octene copolymer and the ethylene / propylene copolymer having an ethylene content of less than 60 mol% is 60 to 99 mass. %. The rubber composition for conveyor belts having the above ratio of 60 to 99% by mass has good processability, and also provides high heat aging resistance and wear resistance to conveyor belts and belt conveyor apparatuses manufactured using the rubber composition. Can do.
The “liquid rubber” refers to a rubber component that is liquid at 24 ° C.

本発明のコンベアベルト用ゴム組成物は、特に、前記エチレン・1−オクテン共重合体及びエチレン含有量が60モル%未満であるエチレン・プロピレン共重合体の総配合量に対するエチレン・1−オクテン共重合体の配合量の割合が、85〜95質量%であるのが好ましい。上記割合が85〜95質量%であることにより、コンベアベルト用ゴム組成物の良好な加工性を維持しつつ、これを用いて製造されるコンベアベルト及びベルトコンベア装置により高い耐熱老化性及び耐摩耗性をもたらすことができる。   The rubber composition for conveyor belts according to the present invention is particularly suitable for the ethylene / 1-octene copolymer relative to the total blending amount of the ethylene / 1-octene copolymer and the ethylene / propylene copolymer having an ethylene content of less than 60 mol%. It is preferable that the ratio of the blended amount of the polymer is 85 to 95% by mass. By maintaining the good processability of the rubber composition for conveyor belts while the ratio is 85 to 95% by mass, the conveyor belt and the belt conveyor apparatus manufactured using the rubber composition have high heat aging resistance and wear resistance. Can bring sex.

また、本発明のコンベアベルト用ゴム組成物は、前記液状ゴムの配合量が、該液状ゴムを除くゴム成分の総配合量100質量部に対し、10〜15質量部であるのが好ましい。前記液状ゴムの配合量がかかる範囲であることにより、コンベアベルト用ゴム組成物の良好な加工性を維持することができる。   In the rubber composition for conveyor belts of the present invention, the amount of the liquid rubber is preferably 10 to 15 parts by mass with respect to 100 parts by mass of the total amount of rubber components excluding the liquid rubber. When the blending amount of the liquid rubber is within such a range, good processability of the rubber composition for conveyor belts can be maintained.

本発明のコンベアベルトは、前記コンベアベルト用ゴム組成物を用いたことを特徴とし、また、本発明のベルトコンベア装置は、前記コンベアベルトを備えることを特徴とする。かかるコンベアベルト及びベルトコンベア装置は、加工性が良好な本発明のコンベアベルト用ゴム組成物を用いて製造することができる上、耐熱老化性及び耐摩耗性に優れる。   The conveyor belt according to the present invention is characterized by using the rubber composition for the conveyor belt, and the belt conveyor device according to the present invention is provided with the conveyor belt. Such a conveyor belt and belt conveyor apparatus can be manufactured using the rubber composition for conveyor belts of the present invention having good processability, and are excellent in heat aging resistance and wear resistance.

本発明によれば、コンベアベルト及びベルトコンベア装置に高い耐熱老化性及び耐摩耗性をもたらすことができる加工性が良好なコンベアベルト用ゴム組成物を提供することができる。また、本発明によれば、耐熱老化性及び耐摩耗性に優れたコンベアベルト及びベルトコンベア装置を提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, the rubber composition for conveyor belts with the favorable workability which can bring high heat aging resistance and abrasion resistance to a conveyor belt and a belt conveyor apparatus can be provided. Moreover, according to this invention, the conveyor belt and belt conveyor apparatus excellent in heat aging resistance and abrasion resistance can be provided.

以下に、本発明を、その一実施形態に基づき詳細に例示説明する。
本発明のコンベアベルト用ゴム組成物は、ゴム成分として、エチレン・1−オクテン共重合体と、エチレン含有量が60モル%未満であるエチレン・プロピレン共重合体と、液状ゴムとを含み、該エチレン・1−オクテン共重合体及びエチレン含有量が60モル%未満であるエチレン・プロピレン共重合体の総配合量に対するエチレン・1−オクテン共重合体の配合量の割合が60〜99質量%であることを特徴とする。
Hereinafter, the present invention will be described in detail based on one embodiment.
The rubber composition for conveyor belts of the present invention includes, as a rubber component, an ethylene / 1-octene copolymer, an ethylene / propylene copolymer having an ethylene content of less than 60 mol%, and a liquid rubber, The ratio of the blending amount of the ethylene / 1-octene copolymer to the total blending amount of the ethylene / 1-octene copolymer and the ethylene / propylene copolymer having an ethylene content of less than 60 mol% is 60 to 99% by mass. It is characterized by being.

本発明のコンベアベルト用ゴム組成物は、ゴム成分として、少なくともエチレン・1−オクテン共重合体を含む。エチレン・1−オクテン共重合体は、得られるコンベアベルトの耐熱老化性及び耐摩耗性の向上に寄与するものと考えられる。   The rubber composition for conveyor belts of the present invention contains at least an ethylene / 1-octene copolymer as a rubber component. The ethylene / 1-octene copolymer is considered to contribute to the improvement of heat aging resistance and wear resistance of the resulting conveyor belt.

本発明に用いるエチレン・1−オクテン共重合体は、1−オクテン含有量が5〜20モル%であるのが好ましく、5〜15モル%であるのがより好ましく、5〜10モル%であるのが最も好ましい。本発明に用いるエチレン・1−オクテン共重合体の1−オクテン含有量が5モル%未満では、得られるコンベアベルトの耐熱老化性及び耐摩耗性を向上させる効果が十分に得られないおそれがあり、一方、20モル%を超えると、ゴム組成物の加工性が悪化するおそれがある。   The ethylene / 1-octene copolymer used in the present invention preferably has a 1-octene content of 5 to 20 mol%, more preferably 5 to 15 mol%, and 5 to 10 mol%. Is most preferred. When the 1-octene content of the ethylene / 1-octene copolymer used in the present invention is less than 5 mol%, the effect of improving the heat aging resistance and wear resistance of the resulting conveyor belt may not be sufficiently obtained. On the other hand, when it exceeds 20 mol%, the processability of the rubber composition may be deteriorated.

前記エチレン・1−オクテン共重合体としては、デュポン・ダウエラストマー社製「Engage(登録商標)8180」(1−オクテン含有量:9モル%)等の市販品を好適に用いることができる。   As the ethylene / 1-octene copolymer, a commercially available product such as “Engage (registered trademark) 8180” (1-octene content: 9 mol%) manufactured by DuPont Dow Elastomer can be suitably used.

また、本発明のコンベアベルト用ゴム組成物は、ゴム成分として、少なくとも、エチレン含有量が60モル%未満であるエチレン・プロピレン共重合体を含む。前記エチレン含有量が60モル%未満であるエチレン・プロピレン共重合体は、前記エチレン・1−オクテン共重合体との併用により、得られるコンベアベルトの耐熱老化性及び耐摩耗性を損なわず、ゴム組成物の加工性を向上させる効果を有する。   Moreover, the rubber composition for conveyor belts of this invention contains the ethylene propylene copolymer whose ethylene content is less than 60 mol% as a rubber component at least. The ethylene / propylene copolymer having an ethylene content of less than 60 mol% is a rubber that does not impair the heat aging resistance and wear resistance of the resulting conveyor belt when used in combination with the ethylene / 1-octene copolymer. It has the effect of improving the processability of the composition.

前記コンベアベルト用ゴム組成物に用いるゴム成分においては、上述のエチレン・1−オクテン共重合体及びエチレン含有量が60モル%未満であるエチレン・プロピレン共重合体の総配合量に対して、エチレン・1−オクテン共重合体の配合量の割合が60〜99質量%であることを要する。上記割合が60〜99質量%であることにより、エチレン・1−オクテン共重合体由来の高い耐熱老化性及び耐摩耗性と、エチレン・プロピレン共重合体由来の良好な加工性とが両立したコンベアベルト用ゴム組成物が得られる。特に、上記割合は、85〜95質量%であるのが好ましく、上記割合が85〜95質量%であることにより、コンベアベルト用ゴム組成物の良好な加工性を維持しつつ、これを用いて製造されるコンベアベルト及びベルトコンベア装置により高い耐熱老化性及び耐摩耗性をもたらすことができる。   In the rubber component used in the rubber composition for conveyor belts, the ethylene / 1-octene copolymer and the ethylene / propylene copolymer having an ethylene content of less than 60 mol% are blended in an amount of ethylene. -The ratio of the compounding quantity of 1-octene copolymer needs to be 60-99 mass%. A conveyor having both high heat aging resistance and wear resistance derived from an ethylene / 1-octene copolymer and good workability derived from an ethylene / propylene copolymer when the ratio is 60 to 99% by mass. A rubber composition for a belt is obtained. In particular, the above ratio is preferably 85 to 95% by mass, and the above ratio is 85 to 95% by mass while maintaining good processability of the rubber composition for conveyor belts. The manufactured conveyor belt and belt conveyor apparatus can provide high heat aging resistance and wear resistance.

上述の通り、本発明のエチレン・プロピレン共重合体は、エチレン含有量が60モル%未満であるが、好ましくは58モル%未満であり、より好ましくは55モル%未満である。通常、耐熱老化性の向上の観点では、配合するエチレン・プロピレン共重合体のエチレン含有率は高い方が好適であると考えられているが、本発明においては、加工性を担保する観点から、エチレン含有率が比較的低いエチレン・プロピレン共重合体を用いることとし、本発明の構成を具備することにより、諸効果を得られることを見出した。なお、エチレン・プロピレン共重合体のエチレン含有量が60モル%を超えると、ゴム組成物の加工性が悪化するおそれがある。また、特に制限されるものではないが、本発明のエチレン・プロピレン共重合体は、エチレン由来の耐熱老化性及び耐摩耗性並びに入手容易性の観点から、エチレン含有量が40モル%以上であるのが好ましい。   As described above, the ethylene / propylene copolymer of the present invention has an ethylene content of less than 60 mol%, preferably less than 58 mol%, more preferably less than 55 mol%. Usually, from the viewpoint of improving heat aging resistance, it is considered that the ethylene content of the ethylene / propylene copolymer to be blended is preferably higher, but in the present invention, from the viewpoint of ensuring workability, It has been found that various effects can be obtained by using an ethylene / propylene copolymer having a relatively low ethylene content and having the structure of the present invention. If the ethylene content of the ethylene / propylene copolymer exceeds 60 mol%, the processability of the rubber composition may be deteriorated. Further, although not particularly limited, the ethylene / propylene copolymer of the present invention has an ethylene content of 40 mol% or more from the viewpoints of heat aging resistance and wear resistance derived from ethylene and availability. Is preferred.

前記エチレン含有量が60モル%未満であるエチレン・プロピレン共重合体としては、日本合成ゴム社製「EP11」(エチレン含有量:53モル%)、三井化学社製「EPT 0045」(エチレン含有量:51モル%)等の市販品を好適に用いることができる。   Examples of the ethylene / propylene copolymer having an ethylene content of less than 60 mol% include “EP11” (ethylene content: 53 mol%) manufactured by Nippon Synthetic Rubber Co., Ltd. and “EPT 0045” (ethylene content manufactured by Mitsui Chemicals, Inc.). : 51 mol%) and the like can be suitably used.

また、本発明のコンベアベルト用ゴム組成物は、ゴム成分として、上述したエチレン・1−オクテン共重合体及びエチレン含有量が60モル%未満であるエチレン・プロピレン共重合体以外のものを含んでもよく、特に制限されることなく、ゴム製品に一般に用いられるジエン系重合体及び/又は非ジエン系重合体を用いることができる。ここで、液状ゴムを除くゴム成分総配合量における、上述したエチレン・1−オクテン共重合体及びエチレン含有量が60モル%未満であるエチレン・プロピレン共重合体の総配合量の割合は、コンベアベルト用ゴム組成物の加工性、並びに、得られるコンベアベルトの耐熱老化性及び耐摩耗性の並立を十分に確保する観点から、好ましくは80質量%以上、より好ましくは90質量%以上、最も好ましくは100質量%である。   Moreover, the rubber composition for conveyor belts of the present invention may contain other than the above-described ethylene / 1-octene copolymer and ethylene / propylene copolymer having an ethylene content of less than 60 mol% as a rubber component. The diene polymer and / or non-diene polymer generally used in rubber products can be used without particular limitation. Here, the ratio of the total blending amount of the ethylene / 1-octene copolymer and the ethylene / propylene copolymer having an ethylene content of less than 60 mol% in the total blending amount of the rubber component excluding the liquid rubber is a conveyor. From the viewpoint of sufficiently ensuring the workability of the rubber composition for the belt and the heat aging resistance and wear resistance of the resulting conveyor belt, it is preferably 80% by mass or more, more preferably 90% by mass or more, and most preferably Is 100% by mass.

エチレン・1−オクテン共重合体の1−オクテン含有量、及びエチレン・プロピレン共重合体のエチレン含有量は、H−NMRスペクトル及び13C−NMRスペクトルの積分比より求めることができる。 The 1-octene content of the ethylene / 1-octene copolymer and the ethylene content of the ethylene / propylene copolymer can be determined from the integration ratio of the 1 H-NMR spectrum and the 13 C-NMR spectrum.

また、本発明のコンベアベルト用ゴム組成物は、前記液状ゴムの配合量が、該液状ゴムを除くゴム成分の総配合量100質量部に対し、10〜15質量部であるのが好ましい。液状ゴムが上記範囲で存在することにより、コンベアベルト用ゴム組成物の良好な加工性を維持することができる。なお、本明細書で「液状ゴム」とは、上述の通り、24℃において液状を呈するゴムのことを指す。前記液状ゴムとしては、特に限定されないが、水素添加イソプレンゴム、水素添加ブタジエンゴム、液状エチレン・プロピレン・ジエン共重合体、液状エチレン・プロピレン共重合体等が挙げられる。   In the rubber composition for conveyor belts of the present invention, the amount of the liquid rubber is preferably 10 to 15 parts by mass with respect to 100 parts by mass of the total amount of rubber components excluding the liquid rubber. When liquid rubber exists in the said range, the favorable workability of the rubber composition for conveyor belts can be maintained. In the present specification, the “liquid rubber” refers to a rubber that is liquid at 24 ° C. as described above. The liquid rubber is not particularly limited, and examples thereof include hydrogenated isoprene rubber, hydrogenated butadiene rubber, liquid ethylene / propylene / diene copolymer, and liquid ethylene / propylene copolymer.

本発明のコンベアベルト用ゴム組成物には、上記成分のほか、通常、架橋剤を配合する。前記架橋剤としては、特に限定されないが、通常の有機過酸化物を用いることができる。その配合量は、ゴム成分中のジエン系重合体100質量部に対し、好ましくは2〜15質量部、より好ましくは3〜10質量部である。架橋剤の配合量が2質量部未満であると、十分に架橋しなくなるおそれがあり、一方、15質量部を超えると、ゴムの老化性能が低下するおそれがある。   In addition to the above components, the rubber composition for conveyor belts of the present invention usually contains a crosslinking agent. Although it does not specifically limit as said crosslinking agent, A normal organic peroxide can be used. The blending amount is preferably 2 to 15 parts by mass, more preferably 3 to 10 parts by mass with respect to 100 parts by mass of the diene polymer in the rubber component. If the blending amount of the cross-linking agent is less than 2 parts by mass, there is a possibility that the cross-linking will not be sufficiently performed, while if it exceeds 15 parts by mass, the aging performance of the rubber may be deteriorated.

さらに、本発明のコンベアベルト用ゴム組成物には、必要に応じて前記成分以外の添加剤等を適宜配合してもよい。かかる添加剤等としては、例えば、架橋助剤、カーボンブラック等の補強性充填剤、老化防止剤、可塑剤、石油樹脂、ワックス類、酸化防止剤、オイル、滑剤、紫外線吸収剤、分散剤、相溶化剤、均質化剤等が挙げられる。本発明のコンベアベルト用ゴム組成物は、これら各成分を、例えば、バンバリーミキサー、ニーダー等で混練りすることにより製造することができる。   Furthermore, you may mix | blend additives other than the said component suitably with the rubber composition for conveyor belts of this invention as needed. Examples of such additives include crosslinking aids, reinforcing fillers such as carbon black, anti-aging agents, plasticizers, petroleum resins, waxes, antioxidants, oils, lubricants, ultraviolet absorbers, dispersants, Examples thereof include a compatibilizing agent and a homogenizing agent. The rubber composition for conveyor belts of the present invention can be produced by kneading these components with, for example, a Banbury mixer, a kneader or the like.

本発明のコンベアベルトは、前記コンベアベルト用ゴム組成物を用いたことを特徴とする。一実施形態においては、前記コンベアベルト用ゴム組成物を、少なくとも、金属コード等からなる補強材の上側の、輸送物品と接触する表層ゴム(上カバーゴム)に用いることが好ましく、さらに、補強材の下側の、ベルトを駆動させるプーリー及びベルトを支持するアイドラーが接触する表層ゴム(下カバーゴム)に用いてもよい。コンベアベルトの具体的な製造例としては、上記コンベアベルト用ゴム組成物からなるシートで補強材を挟み込み、このゴム組成物を加熱圧着して架橋接着することにより、補強材にゴム組成物を接着及び被覆することが挙げられる。これらの場合、架橋条件は適宜選択し得るが、通常140〜200℃で10〜80分の条件とすることが好ましい。かかるコンベアベルトは、加工性が良好な本発明のコンベアベルト用ゴム組成物を用いて製造することができる上、耐熱老化性及び耐摩耗性に優れる。   The conveyor belt of the present invention is characterized by using the rubber composition for a conveyor belt. In one embodiment, it is preferable to use the rubber composition for a conveyor belt as a surface layer rubber (upper cover rubber) that comes into contact with a transported article, at least on the upper side of a reinforcing material made of a metal cord or the like. It may be used as a surface rubber (lower cover rubber) on the lower side where the pulley that drives the belt and the idler that supports the belt contact. As a specific production example of a conveyor belt, a reinforcing material is sandwiched between sheets made of the rubber composition for the conveyor belt, and the rubber composition is bonded to the reinforcing material by thermocompression bonding. And coating. In these cases, the crosslinking conditions can be appropriately selected, but it is usually preferable to set the conditions at 140 to 200 ° C. for 10 to 80 minutes. Such a conveyor belt can be produced using the rubber composition for conveyor belts of the present invention having good processability, and is excellent in heat aging resistance and wear resistance.

本発明のベルトコンベア装置は、本発明のコンベアベルトを備えることを特徴とする。かかるベルトコンベア装置は、本発明のコンベアベルトを用いる以外特に制限はなく、常法に従って製造することができる。なお、本発明のコンベアベルトは、任意の従来のベルトコンベア装置に適用可能であるが、特に、例えば150〜250℃程度の高温物品を搬送することを主目的とするベルトコンベア装置に好適である。かかるベルトコンベア装置は、加工性が良好な本発明のコンベアベルト用ゴム組成物を用いて製造することができる上、耐熱老化性及び耐摩耗性に優れる。   The belt conveyor apparatus of the present invention includes the conveyor belt of the present invention. Such a belt conveyor device is not particularly limited except that the conveyor belt of the present invention is used, and can be manufactured according to a conventional method. In addition, although the conveyor belt of this invention is applicable to arbitrary conventional belt conveyor apparatuses, it is especially suitable for the belt conveyor apparatus which mainly aims at conveying a high temperature article, for example about 150-250 degreeC. . Such a belt conveyor device can be manufactured using the rubber composition for a conveyor belt of the present invention having good processability, and is excellent in heat aging resistance and wear resistance.

以下、実施例を挙げて本発明をさらに詳しく説明するが、本発明は下記の実施例になんら限定されるものではなく、その要旨を変更しない範囲において適宜変更可能である。   EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated in more detail, this invention is not limited to the following Example at all, In the range which does not change the summary, it can change suitably.

1700mlのバンバリーミキサーを用いて、ゴム成分及び配合剤を、表1に示す配合処方で混練り混合し、未架橋のコンベアベルト用ゴム組成物を調製した。かかる未架橋のゴム組成物を用い、下記の方法により、耐熱老化性、耐摩耗性及び加工性を評価した。結果を表1に示す。   Using a 1700 ml Banbury mixer, the rubber component and the compounding agent were kneaded and mixed with the compounding formulation shown in Table 1 to prepare a rubber composition for an uncrosslinked conveyor belt. Using such an uncrosslinked rubber composition, heat aging resistance, wear resistance and processability were evaluated by the following methods. The results are shown in Table 1.

Figure 2014181265
*1 エチレン・1−オクテン共重合体、デュポン・ダウエラストマー社製「Engage8180」、1−オクテン含有量:9モル%
*2 エチレン・プロピレン共重合体A、日本合成ゴム社製「EP11」、エチレン含有量:53モル%
*3 エチレン・プロピレン共重合体B、日本合成ゴム社製「T7942」、エチレン含有量:62モル%
*4 液状ゴム、液状エチレン・プロピレン共重合体、三井化学社製「ルーカントHC3000X」
*5 カーボンブラック、ISAF
*6 ワックス、大内新興化学社製「サンノックW」
*7 老化防止剤A、大内新興化学工業社製「ノクラックCD」、4,4’−ビス(α,α−ジメチルベンジル)ジフェニルアミン
*8 老化防止剤B、大内新興化学工業社製「ノクラックMB」、2−メルカプトベンズイミダゾール
*9 C5樹脂、エクソン社製「エスコレッツ1102」
*10 有機過酸化物、日油社製「ペロキシモンF40」
Figure 2014181265
* 1 Ethylene / 1-octene copolymer, “Engage 8180” manufactured by DuPont Dow Elastomer, 1-octene content: 9 mol%
* 2 Ethylene / propylene copolymer A, “EP11” manufactured by Nippon Synthetic Rubber Co., Ltd., ethylene content: 53 mol%
* 3 Ethylene / propylene copolymer B, “T7942” manufactured by Nippon Synthetic Rubber Co., Ltd., ethylene content: 62 mol%
* 4 Liquid rubber, liquid ethylene / propylene copolymer, “Lucanto HC3000X” manufactured by Mitsui Chemicals, Inc.
* 5 Carbon black, ISAF
* 6 Wax, “Sunknock W” manufactured by Ouchi Shinsei Chemical Co., Ltd.
* 7 Anti-aging agent A, “NOCRACK CD” manufactured by Ouchi Shinsei Chemical Co., Ltd., 4,4′-bis (α, α-dimethylbenzyl) diphenylamine * 8 Anti-aging agent B, “NOCRACK manufactured by Ouchi Shinsei Chemical Industry Co., Ltd. MB ”, 2-mercaptobenzimidazole * 9 C5 resin,“ Escollet 1102 ”manufactured by Exxon
* 10 Organic peroxide, NOF "Peroximon F40"

<耐熱老化性>
得られた各ゴム組成物について、JISダンベル状3号形に打ち抜きを行い、170℃、20分の条件で架橋させた。架橋後の各試料について、JIS−A硬度(H)を測定し、また、JIS K 6251:2001に準拠して25℃で引張試験を行い、破断時伸び(E)(%)及び破断強度(T)(MPa)を測定した。また、上記と同様の条件で架橋させた各試料を、さらに180℃に保持した恒温槽内で14日間放置することにより老化させた後、上記と同様にしてJIS−A硬度(H)を測定し、また、引張試験を行い、破断時伸び(E)(%)及び破断強度(T)(MPa)を測定した。前記破断時伸びの値から、保持率(老化後の破断時伸び値/老化前の破断時伸び値)を算出した。保持率が高いほど、高温に晒されることによる破断時伸びの悪化の度合いが小さく、耐熱老化性に優れることを示す。
<Heat aging resistance>
About each obtained rubber composition, it stamped out to JIS dumbbell-shaped No. 3 form, and was bridge | crosslinked on 170 degreeC and the conditions for 20 minutes. About each sample after bridge | crosslinking, JIS-A hardness ( Hd ) is measured, and the tensile test is done at 25 degreeC based on JISK6251: 2001, elongation at break ( Eb ) (%) and breakage The strength (T b ) (MPa) was measured. Each sample crosslinked under the same conditions as described above was further aged by leaving it in a constant temperature bath maintained at 180 ° C. for 14 days, and then the JIS-A hardness (H d ) was determined in the same manner as described above. In addition, a tensile test was performed to measure elongation at break (E b ) (%) and strength at break (T b ) (MPa). The retention rate (elongation at break after aging / elongation at break before aging) was calculated from the elongation at break. The higher the retention rate, the smaller the degree of deterioration in elongation at break due to exposure to high temperatures, indicating better heat aging resistance.

<耐摩耗性>
170℃、20分の条件での架橋後の各試料、及び、さらに180℃に保持した恒温槽内で14日間放置することにより老化させた後の各試料について、JISK6264−2に準拠して、DIN摩耗試験機を用いて摩耗量を測定した。この量が小さいほど、耐摩耗性に優れることを示す。
<Abrasion resistance>
In accordance with JISK6264-2, each sample after crosslinking under the conditions of 170 ° C. and 20 minutes, and each sample after aging by leaving it in a thermostatic bath maintained at 180 ° C. for 14 days, The amount of wear was measured using a DIN abrasion tester. It shows that it is excellent in abrasion resistance, so that this quantity is small.

<ロール加工性>
50℃の10’’ロールに、圧延シート厚さ3mmの条件で巻き付け、その巻き付き状態を目視で観察して、ロール加工性を評価した。なお、加工性が良好である場合には「○」、若干劣る場合には「△」、不良である場合には「×」として評価した。
<Roll processability>
It was wound around a 10 ″ roll at 50 ° C. under the condition of a rolled sheet thickness of 3 mm, and the rolled state was visually observed to evaluate roll workability. The evaluation was made as “◯” when the workability was good, “Δ” when it was slightly inferior, and “x” when it was poor.

表1の各実施例の結果から、ゴム成分として、エチレン・1−オクテン共重合体と、エチレン含有量が60モル%未満であるエチレン・プロピレン共重合体と、液状ゴムとを含み、該エチレン・1−オクテン共重合体及びエチレン含有量が60モル%未満であるエチレン・プロピレン共重合体の総配合量に対するエチレン・1−オクテン共重合体の配合量の割合が60〜99質量%であるゴム組成物は、加工性が良好な上、これを用いて製造されるコンベアベルト及びベルトコンベア装置に高い耐熱老化性及び耐摩耗性をもたらし得ることが分かる。   From the results of the Examples in Table 1, the rubber component contains an ethylene / 1-octene copolymer, an ethylene / propylene copolymer having an ethylene content of less than 60 mol%, and a liquid rubber. The ratio of the blending amount of the ethylene / 1-octene copolymer to the total blending amount of the ethylene / propylene copolymer having an ethylene content of less than 60 mol% is 60 to 99% by mass. It can be seen that the rubber composition has good processability and can bring high heat aging resistance and wear resistance to a conveyor belt and a belt conveyor apparatus manufactured using the rubber composition.

これに対し、比較例1〜4の結果から、エチレン・1−オクテン共重合体及びエチレン含有量が60モル%未満であるエチレン・プロピレン共重合体の総配合量に対するエチレン・1−オクテン共重合体の配合量の割合が60質量%未満の場合や、エチレン・プロピレン共重合体として、エチレン含有量が60モル%以上のもののみを用いた場合には、少なくとも良好な耐熱老化性及び耐摩耗性が得られないことが分かる。   On the other hand, from the results of Comparative Examples 1 to 4, the ethylene / 1-octene copolymer relative to the total blending amount of the ethylene / 1-octene copolymer and the ethylene / propylene copolymer having an ethylene content of less than 60 mol% was obtained. When the blending ratio is less than 60% by mass, or when only ethylene / propylene copolymer having an ethylene content of 60 mol% or more is used, at least good heat aging resistance and wear resistance It turns out that sex cannot be obtained.

また、比較例5の結果から、ゴム成分として液状ゴムを含まない場合には、十分な加工性が得られないことが分かる。   In addition, it can be seen from the results of Comparative Example 5 that sufficient processability cannot be obtained when liquid rubber is not included as a rubber component.

Claims (5)

ゴム成分として、エチレン・1−オクテン共重合体と、エチレン含有量が60モル%未満であるエチレン・プロピレン共重合体と、液状ゴムとを含み、
該エチレン・1−オクテン共重合体及びエチレン含有量が60モル%未満であるエチレン・プロピレン共重合体の総配合量に対するエチレン・1−オクテン共重合体の配合量の割合が60〜99質量%である
ことを特徴とするコンベアベルト用ゴム組成物。
The rubber component includes an ethylene / 1-octene copolymer, an ethylene / propylene copolymer having an ethylene content of less than 60 mol%, and a liquid rubber.
The ratio of the blending amount of the ethylene / 1-octene copolymer to the total blending amount of the ethylene / 1-octene copolymer and the ethylene / propylene copolymer having an ethylene content of less than 60 mol% is 60 to 99% by mass. The rubber composition for conveyor belts characterized by these.
前記エチレン・1−オクテン共重合体及びエチレン含有量が60モル%未満であるエチレン・プロピレン共重合体の総配合量に対するエチレン・1−オクテン共重合体の配合量の割合が85〜95質量%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 ratio of the blending amount of the ethylene / 1-octene copolymer to the total blending amount of the ethylene / 1-octene copolymer and the ethylene / propylene copolymer having an ethylene content of less than 60 mol% is 85 to 95% by mass. The rubber composition for conveyor belts of Claim 1 which is. 前記液状ゴムの配合量が、該液状ゴムを除くゴム成分の総配合量100質量部に対し、10〜15質量部である、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 conveyor belts of Claim 1 whose compounding quantity of the said liquid rubber is 10-15 mass parts with respect to 100 mass parts of total compounding quantities of the rubber component except this liquid rubber. 請求項1〜3のいずれか一項に記載のコンベアベルト用ゴム組成物を用いたことを特徴と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. 請求項4に記載のコンベアベルトを備えることを特徴とするベルトコンベア装置。   A belt conveyor apparatus comprising the conveyor belt according to claim 4.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11246017A (en) * 1998-03-06 1999-09-14 Bridgestone Corp Heat-resisting belt
JP2011178917A (en) * 2010-03-02 2011-09-15 Yokohama Rubber Co Ltd:The Rubber composition for heat resistant conveyer belt and heat resistant conveyer belt

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11246017A (en) * 1998-03-06 1999-09-14 Bridgestone Corp Heat-resisting belt
JP2011178917A (en) * 2010-03-02 2011-09-15 Yokohama Rubber Co Ltd:The Rubber composition for heat resistant conveyer belt and heat resistant conveyer belt

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