JP6149417B2 - Coated rubber composition for conveyor belt - Google Patents
Coated rubber composition for conveyor belt Download PDFInfo
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- JP6149417B2 JP6149417B2 JP2013022298A JP2013022298A JP6149417B2 JP 6149417 B2 JP6149417 B2 JP 6149417B2 JP 2013022298 A JP2013022298 A JP 2013022298A JP 2013022298 A JP2013022298 A JP 2013022298A JP 6149417 B2 JP6149417 B2 JP 6149417B2
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- 229920001971 elastomer Polymers 0.000 title claims description 155
- 239000005060 rubber Substances 0.000 title claims description 155
- 239000000203 mixture Substances 0.000 title claims description 51
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 48
- 239000006229 carbon black Substances 0.000 claims description 27
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 24
- 229920003244 diene elastomer Polymers 0.000 claims description 17
- 244000043261 Hevea brasiliensis Species 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 14
- 229920003052 natural elastomer Polymers 0.000 claims description 14
- 229920001194 natural rubber Polymers 0.000 claims description 14
- 208000018747 cerebellar ataxia with neuropathy and bilateral vestibular areflexia syndrome Diseases 0.000 claims description 11
- 239000011248 coating agent Substances 0.000 claims description 9
- 238000000576 coating method Methods 0.000 claims description 9
- 239000000945 filler Substances 0.000 claims description 8
- 230000003014 reinforcing effect Effects 0.000 claims description 7
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 238000001179 sorption measurement Methods 0.000 claims description 6
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 claims description 5
- 239000011630 iodine Substances 0.000 claims description 5
- 229910052740 iodine Inorganic materials 0.000 claims description 5
- 235000019241 carbon black Nutrition 0.000 description 25
- 229920003048 styrene butadiene rubber Polymers 0.000 description 16
- 239000002174 Styrene-butadiene Substances 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 13
- 239000003921 oil Substances 0.000 description 10
- 238000012360 testing method Methods 0.000 description 10
- 238000004073 vulcanization Methods 0.000 description 9
- 239000003795 chemical substances by application Substances 0.000 description 7
- 238000002156 mixing Methods 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 6
- 238000005304 joining Methods 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 241000872198 Serjania polyphylla Species 0.000 description 3
- 235000021355 Stearic acid Nutrition 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- DEQZTKGFXNUBJL-UHFFFAOYSA-N n-(1,3-benzothiazol-2-ylsulfanyl)cyclohexanamine Chemical compound C1CCCCC1NSC1=NC2=CC=CC=C2S1 DEQZTKGFXNUBJL-UHFFFAOYSA-N 0.000 description 3
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 3
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 3
- 230000008929 regeneration Effects 0.000 description 3
- 238000011069 regeneration method Methods 0.000 description 3
- 239000008117 stearic acid Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- 239000011787 zinc oxide Substances 0.000 description 3
- YXIWHUQXZSMYRE-UHFFFAOYSA-N 1,3-benzothiazole-2-thiol Chemical compound C1=CC=C2SC(S)=NC2=C1 YXIWHUQXZSMYRE-UHFFFAOYSA-N 0.000 description 2
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229920000459 Nitrile rubber Polymers 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 229920005549 butyl rubber Polymers 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000006237 Intermediate SAF Substances 0.000 description 1
- 239000004594 Masterbatch (MB) Substances 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- 239000006057 Non-nutritive feed additive Substances 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 229920002978 Vinylon Polymers 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 238000007720 emulsion polymerization reaction Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
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- 239000004094 surface-active agent Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Belt Conveyors (AREA)
Description
本発明は、コンベヤベルト用コートゴム組成物に関する。さらに詳しくは、コンベヤベルトのカバーゴムと帆布との間および／または帆布相互間の接着に用いられるコートゴム形成材料等として好適に用いられるコンベヤベルト用コートゴム組成物に関する。 The present invention relates to a coated rubber composition for conveyor belts. More specifically, the present invention relates to a coating rubber composition for a conveyor belt which is suitably used as a coating rubber forming material used for adhesion between a cover rubber and a canvas of a conveyor belt and / or between canvases.
エンドレス状のコンベヤベルトは、ヘッドプーリやテールプーリの部分での屈曲のくり返しにより、接着が不十分であるとカバーゴムの端末部がめくり上がり、エンドレス接合部分で剥離するという現象がみられ、特に上面カバーゴムの厚さが厚い場合には剥離が発生しやすい。カバーゴム端末部の剥離が芯体帆布に迄達すると、摩耗や劣化によりコンベヤベルトが切断する場合がある。 The endless conveyor belt has a phenomenon that the end of the cover rubber turns up due to repeated bending at the head pulley and tail pulley, and the end of the endless joint is peeled off. When the cover rubber is thick, peeling is likely to occur. When the peeling of the cover rubber terminal reaches the core canvas, the conveyor belt may be cut due to wear or deterioration.
そのため、カバーゴムで芯体帆布を挟んで積層したベルト本体を、その端末部で接合させてエンドレス状に構成するコンベヤベルトの接合構造において、ベルト本体のそれぞれの端末部の上面カバーゴムを、芯体帆布から外側に向かって階段状に切除して接合面を形成し、ベルト本体のそれぞれの端末部を突き合わせた状態で接合する接合方法がとられている。(特許文献１、２) Therefore, in the joining structure of the conveyor belt in which the belt body laminated with the core canvas sandwiched by the cover rubber is joined at the end portion thereof, the top cover rubber of each end portion of the belt body is attached to the core. A joining method is used in which a joining surface is formed by cutting out from the body canvas in a stepped manner, and joining is performed in a state where the respective end portions of the belt main body are butted. (Patent Documents 1 and 2)
ところで、コンベヤベルトを構成する帆布とカバーゴムとを接着させるために、カバーゴムと帆布との間または帆布相互間にコートゴム形成材料が用いられている。あるいは、これらの間の両方にコートゴム形成材料が用いられている。コートゴムと帆布との間の接着性が良好な場合には、コンベヤベルトの耐久性はすぐれている一方、コンベヤベルトのエンドレス作業において、芯体である帆布を出すための剥離作業が困難となる場合が多い。また、帆布相互間についても同様のことがいえる。易エンドレス作業性のため、コートゴム形成材料中に含有させる炭酸カルシウムの量を増量させるなどの手法がとられてはいるが、これは耐久性の悪化を招くといった問題がみられる。 By the way, in order to adhere the canvas constituting the conveyor belt and the cover rubber, a coat rubber forming material is used between the cover rubber and the canvas or between the canvases. Alternatively, a coat rubber forming material is used in both of them. When the adhesion between the coated rubber and the canvas is good, the durability of the conveyor belt is excellent. On the other hand, in the endless work of the conveyor belt, it is difficult to peel off the canvas as the core. There are many. The same can be said for the canvases. For easy endless workability, a technique such as increasing the amount of calcium carbonate contained in the coated rubber-forming material has been taken, but this has a problem of deteriorating durability.
本出願人は先に、帆布とカバーゴムとを接着させて構成させるコンベヤベルトの端末部同士を接合させてエンドレスベルトを作製するに際し、カバーゴムと帆布との間および／または帆布相互間の接着に用いられるコートゴム形成材料として、その接着力を適度に低下させることによりエンドレス作業を容易なものとし、しかしながら炭酸カルシウム増量によって剥離力を低下させた場合と比べて、カバーゴムと帆布間または帆布相互間の接着耐久性を改善せしめたコンベヤベルト用コートゴム組成物として、ジエン系ゴムにカーボンブラックおよび炭酸カルシウムを充填剤として配合したゴム組成物において、ジエン系ゴム82.5〜52.5質量％および再生ゴム中のゴム分17.5〜47.5質量％よりなるブレンドゴムが用いられ、ブレンドゴム100質量部当り10〜85質量部の炭酸カルシウムが用いられたコンベヤベルト用コートゴム組成物を提案している(特許文献３)。 The applicant firstly bonded the cover rubber and the canvas and / or between the canvases when producing the endless belt by joining the end portions of the conveyor belt formed by bonding the canvas and the cover rubber. As a coating rubber forming material used for coating, endless work is facilitated by moderately reducing its adhesive strength, but compared with the case where the peel strength is reduced by increasing the amount of calcium carbonate, the cover rubber and the canvas In a rubber composition in which carbon black and calcium carbonate are blended in a diene rubber as a filler, as a coated rubber composition for a conveyor belt with improved adhesion durability between them, 82.5 to 52.5% by mass of diene rubber and recycled rubber A blend rubber consisting of 17.5 to 47.5% by mass of rubber is used. A coated rubber composition for conveyor belts using 10 to 85 parts by mass of calcium carbonate is proposed (Patent Document 3).
このコンベヤベルト用コートゴム組成物を、コンベヤベルトのカバーゴムと帆布との間、帆布相互間またはこれらの間の両方向けのコートゴム形成材料として補強層形成のために用いられた場合には、その間の接着力が適度に低下し、剥離を伴うエンドレス作業を容易なものとし、しかもその間の接着耐久性は確保されており、長期間にわたりコンベヤベルトとして安定して走行させることを可能とするという所期の目的を十分に達成させる。 When this coated rubber composition for conveyor belts is used for forming a reinforcing layer as a coating rubber forming material between the cover rubber of the conveyor belt and the canvas, between the canvases, or both, between them, The adhesive strength is reduced moderately, endless work with peeling is facilitated, and the durability of the adhesion is ensured during that time, enabling it to run stably as a conveyor belt for a long time. To fully achieve the objectives.
ここで、カバーゴムと帆布との間、帆布相互間に用いられるコートゴムには、高い剥離力と共に、耐久性の観点から帆布との良好な接着性が要求される。高い剥離力が要求される場合には、一般にはコートゴムに小粒子径のカーボンブラックを配合して高い剥離力とすることも行われるが、この場合には剥離面のゴム付(剥離試験後、帆布表面に付着しているゴムを目視で観察し、剥離による破壊がコートゴム層の全面で起こっている場合を100％とする割合)が低下してしまう。一方、剥離面のゴム付を良くするためには、大粒子径のカーボンブラックや多量の炭酸カルシウムを配合する方法があるが、この場合には剥離力が低下するようになる。このように、接着面における剥離力とゴム付とは二律背反の関係にあり、これらを同時に満足させることはできない。 Here, the coat rubber used between the cover rubber and the canvas and between the canvases is required to have a high peel strength and good adhesion to the canvas from the viewpoint of durability. When a high peel force is required, it is generally performed by adding a small particle diameter carbon black to the coat rubber to obtain a high peel force. The rubber adhering to the surface of the canvas is visually observed, and the ratio of 100% when the destruction due to peeling occurs on the entire surface of the coated rubber layer is reduced. On the other hand, in order to improve the rubberization of the release surface, there is a method of blending carbon black with a large particle diameter or a large amount of calcium carbonate, but in this case, the release force is reduced. Thus, the peeling force on the adhesive surface and the rubber attachment are in a trade-off relationship, and these cannot be satisfied at the same time.
本出願人はさらに、カバーゴムと帆布との間および／または帆布相互間の接着に用いられるコートゴム形成材料として、カバーゴムと帆布間または帆布相互間の剥離力およびゴム付の双方を改善せしめた加硫物を与えうるコンベヤベルト用コートゴム組成物として、ジエン系ゴムにカーボンブラックおよび炭酸カルシウムを充填剤として配合したゴム組成物において、ジエン系ゴム83.0〜97.5質量％および再生ゴム中のゴム分2.5〜17.0質量％よりなるブレンドゴムが用いられ、ブレンドゴム100質量部当たり窒素吸着比表面積30〜50m2/g、DBP吸油量95〜125ml/100gのカーボンブラック45〜75質量部および炭酸カルシウム5〜50質量部が用いられたコンベヤベルト用コートゴム組成物を提案している(特許文献４)。 The Applicant has further improved both the peel force between the cover rubber and the canvas or between the canvases and the rubber as a coating rubber forming material used for bonding between the cover rubber and the canvas and / or between the canvases. A rubber composition in which carbon black and calcium carbonate are blended with a diene rubber as a filler, as a coated rubber composition for a conveyor belt capable of giving a vulcanizate, 83.0 to 97.5% by mass of a diene rubber and a rubber content of 2.5% in a recycled rubber Blend rubber composed of ˜17.0% by mass is used, and carbon black having 45 to 75 parts by mass of carbon black having a nitrogen adsorption specific surface area of 30 to 50 m 2 / g, DBP oil absorption of 95 to 125 ml / 100 g per 100 parts by mass of blend rubber and 5 to 5 of calcium carbonate A coated rubber composition for conveyor belts using 50 parts by mass has been proposed (Patent Document 4).
本発明の目的は、ジエン系ゴムにカーボンブラックおよび炭酸カルシウムを充填剤として配合したゴム組成物において、ジエン系ゴム75〜65質量部および再生ゴム中のゴム分25〜35質量部よりなるブレンドゴム(合計100質量部)が用いられ、このブレンドゴムにカーボンブラックおよび炭酸カルシウムを配合したコンベヤベルト用コートゴム組成物において、対帆布接着性の目安となる剥離力を適度に低下させることにより、エンドレス部の作業容易性と接着耐久性とを改善せしめたものを提供することにある。 An object of the present invention is to provide a blended rubber comprising 75 to 65 parts by weight of a diene rubber and 25 to 35 parts by weight of a rubber component in a recycled rubber in a rubber composition containing carbon black and calcium carbonate as a filler in a diene rubber. In the coated rubber composition for conveyor belts, in which carbon black and calcium carbonate are blended with this blend rubber, the endless part is reduced by appropriately reducing the peeling force that is a measure of adhesion to canvas. An object of the present invention is to provide an improved workability and adhesion durability.
かかる本発明の目的は、上記コンベヤベルト用コートゴム組成物において、ブレンドゴム100質量部当りヨウ素吸着量20〜32g/kg、DBP吸収量78〜92ml/100gのカーボンブラック10〜20質量部および炭酸カルシウム80〜100質量部が用いられたコートゴム組成物によって達成される。 The object of the present invention is to provide the above coated rubber composition for conveyor belts, 10 to 20 parts by mass of carbon black having an iodine adsorption of 20 to 32 g / kg and a DBP absorption of 78 to 92 ml / 100 g per 100 parts by mass of blend rubber, and calcium carbonate. This is achieved by the coated rubber composition in which 80 to 100 parts by mass are used.
本発明に係るコンベヤベルト用コートゴム組成物においては、特許文献３で用いられてはいるものの、その使用割合を低減させたカーボンブラックおよび特許文献４で用いられてはいるものの、その使用割合を増加させた炭酸カルシウムを用いることにより、コンベヤベルトのカバーゴムと帆布との間および／または帆布相互間のコートゴム形成材料として用いられたとき、その間の剥離力を適度に低下させ、より具体的には3.5〜5N/mm、好ましくは3.5〜4.5N/mmという範囲に低下させ、剥離を伴うエンドレス作業を容易なものとし、しかもその間の接着耐久性は確保されており、長期間にわたりコンベヤベルトとして安定に走行させることを可能としている。 In the coated rubber composition for a conveyor belt according to the present invention, although used in Patent Document 3, carbon black with a reduced use ratio and used in Patent Document 4 increase the use ratio. When used as a coating rubber forming material between the cover rubber and the canvas of the conveyor belt and / or between the canvases, the peeling force between them is moderately reduced. Reduced to 3.5 to 5 N / mm, preferably 3.5 to 4.5 N / mm, making endless work with peeling easy and ensuring durability of adhesion between them, stable as a conveyor belt for a long time It is possible to make it run.
ジエン系ゴムとしては、再生ゴムとのブレンドゴム100質量部当り75〜65質量部を占める割合のジエン系ゴムが用いられる。ジエン系ゴムは、いずれもゴムとして20〜30質量部の天然ゴムおよび35〜55質量部のSBR(スチレンブタジエンゴム)よりなり、その合計量がブレンドゴム中75〜65質量部となる割合で用いられる。ジエン系ゴムがこれより多い割合で用いられると、フレキシング試験における耐久性にはすぐれるが、対帆布接着試験における剥離力が大きくなり、エンドレス作業が容易ではなくなる。また、ジエン系ゴムがこれより少ない割合で用いられあるいは天然ゴムおよびSBRの使用割合がこの範囲外にあると、対帆布接着性の剥離力は小さくなるものの、フレキシング試験における耐久性に劣るようになる。なお、SBRは、乳化重合SBR、溶液重合SBRまたはこれらの油展品のいずれも用いることが出来る。 As the diene rubber, a diene rubber in a ratio of 75 to 65 parts by mass per 100 parts by mass of the blended rubber with the recycled rubber is used. The diene rubber is composed of 20 to 30 parts by weight of natural rubber and 35 to 55 parts by weight of SBR (styrene butadiene rubber) as rubber, and the total amount is 75 to 65 parts by weight in the blend rubber. It is done. If the diene rubber is used in a higher proportion, the durability in the flexing test is excellent, but the peel force in the anti-cloth adhesion test is increased, and the endless work is not easy. Also, if diene rubber is used in a smaller proportion or if the proportion of natural rubber and SBR is out of this range, the peel strength for adhesion to canvas will be reduced, but it will be inferior in durability in flexing tests. become. As the SBR, any of emulsion polymerization SBR, solution polymerization SBR, and these oil-extended products can be used.
これらのジエン系ゴムとブレンドされて用いられる再生ゴムは、カーボン分、オイル分等を含有する再生ゴム中のゴム分としてジエン系ゴムとのブレンドゴム100質量部当り25〜35質量部を占める割合で用いられる。再生ゴムのブレンド割合がこれよりも少ないと、フレキシング試験における耐久性は増加するものの、対帆布接着力が大となり、剥離作業が難くなる。なお、剥離力を低下させるために、規定量以上の炭酸カルシウムを用いると、フレキシング試験における耐久性の低下を免れない。 Recycled rubber used by blending with these diene rubbers is a proportion of 25 to 35 parts by weight per 100 parts by weight of blended rubber with diene rubber as a rubber component in recycled rubber containing carbon, oil, etc. Used in If the blend ratio of the recycled rubber is less than this, the durability in the flexing test is increased, but the adhesion force to the canvas becomes large and the peeling work becomes difficult. In addition, in order to reduce peeling force, when calcium carbonate more than a specified amount is used, a decrease in durability in the flexing test is inevitable.
再生ゴムとしては、JIS K6313(1999)に規定される下記各種再生ゴムの少くとも一種が用いられ、好ましくは天然ゴム主体の再生ゴム(ゴム分50質量％)、例えばタイヤ再生ゴム(A級)が用いられ、これ以外にも天然ゴム主体の再生ゴムを任意に用いることができる。
種類 略号 材料
チューブ再生ゴム
天然ゴム AN 天然ゴムを主とするタイヤ用チューブのゴム
ブチルゴム AI ブチルゴムを主とするタイヤ用チューブのゴム
タイヤ再生ゴム
Ａ級 BT 大型自動車タイヤのゴムまたは同程度のもの
Ｂ級 BP 乗用車タイヤのゴムまたは同程度のもの
その他の再生ゴム
Ａ級 C1 自動車タイヤ、チューブ以外のゴム
Ｂ級 C2 自動車タイヤ、チューブ以外のゴム
注) 再生ゴムに含まれている原料ゴムの同定は、JIS K6230、K6231に規定する 方法による
As the recycled rubber, at least one of the following various recycled rubbers stipulated in JIS K6313 (1999) is used, preferably a natural rubber-based recycled rubber (rubber content 50% by mass), for example, a tire recycled rubber (Class A) Other than this, recycled rubber mainly composed of natural rubber can be arbitrarily used.
Type abbreviation material
Tube Recycled Rubber Natural Rubber AN Rubber for Tire Tubes Mainly Made of Natural Rubber Butyl Rubber AI Rubber for Tire Tubes Mainly Made of Butyl Rubber Tire Recycled Rubber Class A BT Rubber for Large Car Tires or Similar Class B Class BP Passenger Car Tires Other rubbers of the same grade or other grade A C1 Rubber other than automobile tires and tubes Class B C2 Rubber other than automobile tires and tubes
Note) Identification of raw rubber contained in recycled rubber is based on the method specified in JIS K6230 and K6231.
その品質についてもJISで規定されており、再生ゴムは均質で粗粒を含まず、かつ金属片、木片、土砂、繊維等の異物混入は痕跡以下であり、ゴムに混用しまたは単独で用いてもゴム製品の製造材料として適切なものでなければならず、密度、ムーニー粘度ML1+4(100℃)、灰分、アセトン抽出物、引張試験(引張強さ、伸び)、生ゴム混用試験(引張強さの保有率)などについても、それぞれ再生ゴムの種類に応じて規定されている。 The quality is also stipulated in JIS. Recycled rubber is homogeneous and does not contain coarse particles, and foreign matters such as metal pieces, wood pieces, earth and sand, and fibers are less than traces, and can be mixed with rubber or used alone. It must be suitable as a material for manufacturing rubber products. Density, Mooney viscosity ML 1 + 4 (100 ° C), ash, acetone extract, tensile test (tensile strength, elongation), raw rubber mixed test (tensile) Strength holding ratio) is also defined according to the type of recycled rubber.
このような再生ゴムを所定割合でブレンドさせたジエン系ゴムには、所定のカーボンブラックおよび炭酸カルシウムが充填剤として所定量配合される。 A predetermined amount of carbon black and calcium carbonate as a filler is blended in the diene rubber obtained by blending such recycled rubber at a predetermined ratio.
カーボンブラックとしては、ヨウ素吸着量が20〜32g/kg、DBP吸収量が78〜92ml/100gのカーボンブラック、より具体的にはGPF級カーボンブラックが、ブレンドゴム100質量部当たり10〜20質量部の割合で用いられる。ヨウ素吸着量およびDBP吸収量がこれ以外のカーボンブラック、例えばISAF級カーボンブラックを用いると、剥離力が強くなりエンドレス作業性が困難になる。また、カーボンブラックがこれより少ない割合で用いられると、コンベヤベルト用コートゴムに必要とされる機械的強度を満足できず、一方これより多い割合で用いられると機械的強度が高くなりすぎ、ゴム付が低下するようになる。 As carbon black, carbon black with iodine adsorption of 20-32 g / kg and DBP absorption of 78-92 ml / 100 g, more specifically GPF grade carbon black, 10-20 parts by mass per 100 parts by mass of blend rubber It is used in the ratio. When carbon blacks other than iodine adsorption amount and DBP absorption amount, such as ISAF grade carbon black, are used, the peeling force becomes strong and the endless workability becomes difficult. Also, if carbon black is used at a lower ratio, the mechanical strength required for the conveyor belt coat rubber cannot be satisfied. On the other hand, if it is used at a higher ratio, the mechanical strength becomes too high, and the rubber attached. Will fall.
炭酸カルシウムはブレンドゴム100質量部当り80〜100質量部の割合で用いられる。炭酸カルシウムの配合割合がこれよりも少ないと、剥離力が強くなりエンドレス作業性が困難になり、一方これより多い割合で用いられると、耐久性が著しく低下する。 Calcium carbonate is used in a ratio of 80 to 100 parts by mass per 100 parts by mass of the blend rubber. When the blending ratio of calcium carbonate is less than this, the peeling force becomes strong and the endless workability becomes difficult. On the other hand, when the blending ratio is larger than this, the durability is remarkably lowered.
なお、下記特許文献５には、SBR 25〜40質量％、鉱油15〜40質量％およびカーボンブラック33〜47質量％よりなるゴム組成物、いわゆるコールドSBRオイルブラックマスターバッチ1800シリーズであるゴム組成物100質量部に対しゴムまたは再生ゴムを100質量部以下、ならびに前記ゴム組成物とゴムまたは再生ゴムとの合算量100質量部に対して比重2.5以上の無機物質(例えば、炭酸カルシウム)100〜600質量部と微粉状石炭10〜100質量部を配合した柔軟性ゴム組成物が記載されているが、その目的とするところは低周波減衰性能を付与することにあって、炭酸カルシウム等と共に微粉状石炭の配合を必須要件としているばかりではなく、無機物質の配合割合も100〜600質量部と著しく多く用いられていて、このような組成物をコンベヤベルトのコートゴム形成材料として用いた場合には、コンベヤベルトの剥離力は必要以上に著しく低下する(特許文献５)。 In Patent Document 5 below, a rubber composition comprising 25 to 40% by mass of SBR, 15 to 40% by mass of mineral oil and 33 to 47% by mass of carbon black, a rubber composition which is a so-called cold SBR oil black masterbatch 1800 series. 100 to 600 parts by mass of rubber or recycled rubber with respect to 100 parts by mass, and an inorganic substance (for example, calcium carbonate) having a specific gravity of 2.5 or more with respect to 100 parts by mass of the total amount of the rubber composition and rubber or recycled rubber. A flexible rubber composition containing 10 parts by mass and 10 to 100 parts by mass of pulverized coal is described, but the object is to provide low-frequency damping performance, and it is finely pulverized with calcium carbonate and the like. Not only is the blending of coal an essential requirement, but the blending ratio of inorganic substances is remarkably high at 100 to 600 parts by weight, and such a composition is used as a coating rubber forming material for conveyor belts. When used as the release force of the conveyor belt is reduced considerably more than necessary (Patent Document 5).
本発明に係るコンベヤベルト用コートゴム組成物には、以上の各必須成分に加えて、加硫剤、加硫促進剤、加硫助剤、加硫遅延剤および本発明の目的を損なわない範囲で、各種配合剤、例えば補強剤(充填剤)、老化防止剤、酸化防止剤、顔料(染料)、可塑剤、難燃剤、溶剤、界面活性剤(レベリング剤を含む)、分散剤、脱水剤、防錆剤、接着付与剤、帯電防止剤、フィラー(充填剤)、加工助剤等が適宜配合される。 The coated rubber composition for conveyor belts according to the present invention includes, in addition to the above essential components, a vulcanizing agent, a vulcanization accelerator, a vulcanization aid, a vulcanization retarder, and the scope of the present invention. Various compounding agents such as reinforcing agents (fillers), anti-aging agents, antioxidants, pigments (dyes), plasticizers, flame retardants, solvents, surfactants (including leveling agents), dispersants, dehydrating agents, A rust preventive agent, an adhesion imparting agent, an antistatic agent, a filler (filler), a processing aid and the like are appropriately blended.
得られたコンベヤベルト用コートゴム組成物は、ロール、ニーダ、バンバリーミキサ等を用いて混練りされた後、コートゴム形成材料として、コンベヤベルトのカバーゴムと帆布との間または帆布相互間(あるいはこれら両方)の接着に用いられる。具体的には、カレンダロール等を用いてコンベヤベルト用コートゴム組成物を帆布の両面と圧着させてシート状補強層とした後、このシート状補強層を少くとも１層以上積層し、その上下にそれぞれ上面および下面カバーゴムを積層する。その後、例えば150〜170℃の温度で10〜60分間加圧することによりカバーゴムと帆布との間の接着が行われ、コンベヤベルトが作製される。帆布は、ナイロン、ポリエステル、ビニロン、アラミド等の有機繊維を帆布状に織成し、芯体補強層として使用される。 The resulting coated rubber composition for conveyor belts is kneaded using a roll, kneader, Banbury mixer, etc., and then used as a coated rubber forming material between the conveyor belt cover rubber and the canvas or between the canvases (or both of them). ). Specifically, a calender roll or the like is used to compress the coated rubber composition for conveyor belts onto both sides of the canvas to form a sheet-like reinforcing layer, and then at least one or more layers of this sheet-like reinforcing layer are laminated on the upper and lower sides. Laminate upper and lower cover rubbers respectively. Thereafter, the cover rubber and the canvas are bonded by pressurizing, for example, at a temperature of 150 to 170 ° C. for 10 to 60 minutes, and a conveyor belt is manufactured. The canvas is used as a core reinforcing layer in which organic fibers such as nylon, polyester, vinylon, and aramid are woven into a canvas.
次に、実施例について本発明を説明する。 Next, the present invention will be described with reference to examples.
実施例１
天然ゴム(RSS#3) 25質量部
SBR(日本ゼオン製品Nipol 1502) 45 〃
タイヤ再生ゴムA級(村岡ゴム工業製品タイヤリク紫線) 60 〃
(再生ゴム分) (30 〃)
GPF級カーボンブラック(ヨウ素吸着量32g/kg、DBP吸収量88ml/100g) 10 〃
炭酸カルシウム 80 〃
酸化亜鉛 2.5 〃
ステアリン酸 2.0 〃
アロマオイル(三共油化工業製品A-OMIX) 20 〃
硫黄 2.6 〃
加硫促進剤CZ(大内新興化学工業製品) 1.0 〃
加硫促進剤M(大内新興化学工業製品) 0.4 〃
以上の各成分をバンバリーミキサ等で混練し、コンベヤベルト用コートゴム組成物を調製した。
Example 1
Natural rubber (RSS # 3) 25 parts by mass
SBR (Nippon ZEON product Nipol 1502) 45 〃
Tire regeneration rubber class A (Muraoka Rubber Industrial Tire Tire Purple Line) 60 〃
(Recycled rubber) (30 〃)
GPF grade carbon black (Iodine adsorption 32g / kg, DBP absorption 88ml / 100g) 10 〃
Calcium carbonate 80 〃
Zinc oxide 2.5 〃
Stearic acid 2.0 〃
Aroma oil (Sankyo Oil Chemicals A-OMIX) 20 〃
Sulfur 2.6 〃
Vulcanization accelerator CZ (Ouchi New Chemical Products) 1.0 〃
Vulcanization Accelerator M (Ouchi New Chemical Products) 0.4 〃
The above components were kneaded with a Banbury mixer or the like to prepare a coated rubber composition for a conveyor belt.
実施例２
実施例１において、GPF級カーボンブラック量が20質量部に変更されて用いられた。
Example 2
In Example 1, the amount of GPF grade carbon black was changed to 20 parts by mass.
実施例３
実施例１において、炭酸カルシウム量が100質量部に変更されて用いられた。
Example 3
In Example 1, the amount of calcium carbonate was changed to 100 parts by mass and used.
実施例４
実施例２において、炭酸カルシウム量が100質量部に変更されて用いられた。
Example 4
In Example 2, the amount of calcium carbonate was changed to 100 parts by mass and used.
比較例１
実施例１において、GPF級カーボンブラックが用いられなかった。
Comparative Example 1
In Example 1, GPF grade carbon black was not used.
比較例２
実施例３において、GPF級カーボンブラックが用いられなかった。
Comparative Example 2
In Example 3, GPF grade carbon black was not used.
比較例３
実施例１において、炭酸カルシウム量が60質量部に変更されて用いられた。
Comparative Example 3
In Example 1, the amount of calcium carbonate was changed to 60 parts by mass and used.
比較例４
実施例１において、炭酸カルシウム量が120質量部に変更されて用いられた。
Comparative Example 4
In Example 1, the amount of calcium carbonate was changed to 120 parts by mass and used.
比較例５
実施例１において、GPF級カーボンブラック量が30質量部に変更されて用いられた。
Comparative Example 5
In Example 1, the amount of GPF grade carbon black was changed to 30 parts by mass.
比較例６
実施例１において、GPF級カーボンブラック量が40質量部に変更されて用いられた。
Comparative Example 6
In Example 1, the amount of GPF grade carbon black was changed to 40 parts by mass.
比較例７
天然ゴム(RSS#3) 25質量部
油展SBR(日本ゼオン製品Nipol 1712；37.5phr油展) 41.25 〃
(SBR分) (30 〃 )
タイヤ再生ゴムA級(村岡ゴム工業製品タイヤリク紫線) 90 〃
(再生ゴム分) (45 〃 )
GPF級カーボンブラック 60 〃
炭酸カルシウム 60 〃
酸化亜鉛 3 〃
ステアリン酸 2 〃
アロマオイル(三共油化工業製品A-OMIX) 30 〃
硫黄 2.6 〃
加硫促進剤CZ(大内新興化学工業製品) 1 〃
以上の各成分をバンバリーミキサ等で混練し、コンベヤベルト用コートゴム組成物を調製した。
Comparative Example 7
Natural rubber (RSS # 3) 25 parts by mass Oil exhibition SBR (Nippon Zeon product Nipol 1712; 37.5phr oil exhibition) 41.251.25
(For SBR) (30 〃)
Tire regeneration rubber class A (Muraoka Rubber Industrial Tire Tire Purple Line) 90 〃
(Recycled rubber) (45 〃)
GPF grade carbon black 60 〃
Calcium carbonate 60 〃
Zinc oxide 3 〃
Stearic acid 2 〃
Aroma oil (Sankyo Oil Chemicals A-OMIX) 30 〃
Sulfur 2.6 〃
Vulcanization accelerator CZ (Ouchi New Chemical Products) 1
The above components were kneaded with a Banbury mixer or the like to prepare a coated rubber composition for a conveyor belt.
比較例８
比較例５において、天然ゴム量が55質量部に、油展SBR量が34.80質量部(SBR分25質量部)に、タイヤ再生ゴム量が40質量部(再生ゴム分20質量部)にそれぞれ変更して用いられた。
Comparative Example 8
In Comparative Example 5, the amount of natural rubber was changed to 55 parts by mass, the amount of oil-extended SBR was changed to 34.80 parts by mass (25 parts by mass for SBR), and the amount of recycled tires was changed to 40 parts by mass (20 parts by mass of recycled rubber). Used.
比較例９
比較例５において、天然ゴム量が55質量部に、油展SBR量が20.63質量部(SBR分15質量部)に、タイヤ再生ゴム量が60質量部(再生ゴム分30質量部)にそれぞれ変更して用いられた。
Comparative Example 9
In Comparative Example 5, the amount of natural rubber was changed to 55 parts by mass, the amount of oil-extended SBR was changed to 20.63 parts by mass (15 parts by mass for SBR), and the amount of recycled tires was changed to 60 parts by mass (30 parts by weight of recycled rubber). Used.
得られたコンベヤベルト用コートゴム組成物を用い、次の各項目の測定を行った。
常態物性：この組成物を150℃、30分間プレス加硫した加硫物について、JIS K6251
-2004に準拠して引張強さおよび伸びを、JIS K6253-2006に準拠して硬
さを、JIS K6252-2001に準拠して引裂き強さをそれぞれ測定した
対ポリエステル帆布接着性：
コートゴム組成物シート(厚さ3mm)／帆布／コートゴム組成物シート(厚さ
0.6mm)／帆布／コートゴム組成物シート(厚さ5mm)の順に積層し、長さ450
mm、幅200mmのモールドを用いて、150℃、30分の条件下で加硫を行って得
られた評価用サンプルから長さ方向に25mm幅のサンプルを採取し、剥離力
はJIS K6256-1：2006「布との剥離強さ」に準拠して測定し、ゴム付は剥
離試験後、帆布表面に付着しているゴムを目視にて確認した（剥離による
破壊がコートゴム層の全面で起こっている場合はゴム付が100％となり、
接着が最も良好となる)
フレキシング試験：上記評価用サンプルから25mm幅のサンプルを採取し、25mm径の
プーリにかけ、35kgfの張力をかけた状態で屈曲試験を行ったときに、カ
バーゴム-コートゴム間、コートゴム層内およびコートゴム-帆布間のいず
れかに剥離が発生する迄の回数を測定した
Using the resulting coated rubber composition for conveyor belts, the following items were measured.
Normal physical properties: JIS K6251 for the vulcanized product obtained by press vulcanizing this composition for 30 minutes at 150 ° C
-Tensile strength and elongation according to JIS 2004, hardened according to JIS K6253-2006
The tear strength was measured according to JIS K6252-2001, respectively. Adhesion to polyester canvas:
Coated rubber composition sheet (thickness 3 mm) / canvas / coated rubber composition sheet (thickness)
0.6mm) / canvas / coated rubber composition sheet (thickness 5mm)
obtained by vulcanization using a mold with a width of 200 mm and a width of 200 mm at 150 ° C for 30 minutes.
Take a 25 mm wide sample from the evaluation sample, and peel it off.
Is measured in accordance with JIS K6256-1: 2006 “Peeling strength with cloth”, with rubber
After the separation test, the rubber adhering to the canvas surface was visually confirmed (by peeling
If destruction occurs on the entire surface of the coated rubber layer, the rubber is 100%,
(Adhesion is the best)
Flexing test: A 25 mm wide sample was taken from the above sample for evaluation, and a 25 mm diameter sample was taken.
When a bending test is performed with a 35 kgf tension applied to the pulley,
Between bar rubber and coat rubber, between coat rubber layer and between coat rubber and canvas
The number of times until peeling occurred was measured
得られた結果は、次の表に示される。なお、比較例７〜９は、特許文献３の実施例１〜３に相当する。
表
実施例 比較例
１ ２ ３ ４ １ ２ ３ ４ ５ ６ ７ ８ ９
〔組成物成分〕
天然ゴム 25 25 25 25 25 25 25 25 25 25 25 55 55
SBR1502 45 45 45 45 45 45 45 45 45 45 − − −
SBR1712 − − − − − − − − − − 41.25 34.80 20.63
(SBR分) − − − − − − − − − − (30) (25) (15)
タイヤ再生ゴム 60 60 60 60 60 60 60 60 60 60 90 40 60
(再生ゴム分) (30) (30) (30) (30) (30) (30) (30) (30) (30) (30) (45) (20) (30)
GPF級CB 10 20 10 20 − − 10 10 30 40 60 60 60
CaCO 3 80 80 100 100 80 100 60 120 80 80 60 60 60
ZnO 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 3.0 3.0 3.0
ステアリン酸 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0
アロマオイル 20 20 20 20 20 20 20 20 20 20 30 30 30
硫黄 2.60 2.60 2.60 2.60 2.60 2.60 2.60 2.60 2.60 2.60 2.60 2.60 2.60
加硫促進剤CZ 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00
加硫促進剤M 0.40 0.40 0.40 0.40 0.40 0.40 0.40 0.40 0.40 0.40 − − −
〔測定結果〕
＜常態物性＞
引張強さ(MPa) 6.2 6.4 6.0 5.5 5.9 5.2 6.8 5.4 7.1 7.2 7.6 10.1 8.8
伸び (％) 440 431 440 402 441 449 450 380 433 433 355 450 420
硬さ 52 54 54 56 50 53 49 57 55 54 62 60 64
引裂き強さ 14 15 14 15 13 13 18 13 20 25 21 26 23
(N/mm)
＜対帆布接着性＞
剥離力 (N/mm) 3.9 4.4 3.7 4.0 3.4 3.3 5.1 3.0 5.2 5.5 5.3 6.2 5.4
ゴム付 (％)100 100 100 100 100 100 100 100 100 100 100 100 100
＜フレキシング試験＞
耐久回数 80 81 54 58 59 38 95 28 110 110 64 >101 72
(×104回)
注１) 対帆布接着性の剥離力は、3.5〜5.0N/mmのものがエンドレス作業性に
すぐれている
注２) フレキシング試験における耐久回数は600,000回以上では剥離などが
発生せず、耐久性にすぐれている
The results obtained are shown in the following table. Note that Comparative Examples 7 to 9 correspond to Examples 1 to 3 of Patent Document 3.
table
Example Comparative Example
1 2 3 4 1 2 3 4 5 6 7 8 9
(Composition component)
Natural rubber 25 25 25 25 25 25 25 25 25 25 25 55 55
SBR1502 45 45 45 45 45 45 45 45 45 45 − − −
SBR1712 − − − − − − − − − − 41.25 34.80 20.63
(SBR) − − − − − − − − − − (30) (25) (15)
Tire regeneration rubber 60 60 60 60 60 60 60 60 60 60 90 40 60
(Recycled rubber) (30) (30) (30) (30) (30) (30) (30) (30) (30) (30) (45) (20) (30)
GPF class CB 10 20 10 20 − − 10 10 30 40 60 60 60
CaC O 3 80 80 100 100 80 100 60 120 80 80 60 60 60
ZnO 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 3.0 3.0 3.0
Stearic acid 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0
Aroma oil 20 20 20 20 20 20 20 20 20 20 30 30 30
Sulfur 2.60 2.60 2.60 2.60 2.60 2.60 2.60 2.60 2.60 2.60 2.60 2.60 2.60
Vulcanization accelerator CZ 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00
Vulcanization accelerator M 0.40 0.40 0.40 0.40 0.40 0.40 0.40 0.40 0.40 0.40 − − −
〔Measurement result〕
<Normal physical properties>
Tensile strength (MPa) 6.2 6.4 6.0 5.5 5.9 5.2 6.8 5.4 7.1 7.2 7.6 10.1 8.8
Elongation (%) 440 431 440 402 441 449 450 380 433 433 355 450 420
Hardness 52 54 54 56 50 53 49 57 55 54 62 60 64
Tear strength 14 15 14 15 13 13 18 13 20 25 21 26 23
(N / mm)
<Adhesion to canvas>
Peeling force (N / mm) 3.9 4.4 3.7 4.0 3.4 3.3 5.1 3.0 5.2 5.5 5.3 6.2 5.4
With rubber (%) 100 100 100 100 100 100 100 100 100 100 100 100 100
<Flexing test>
Durability 80 81 54 58 59 38 95 28 110 110 64> 101 72
(× 10 4 times)
Note 1) The peel strength of adhesive to canvas is 3.5 to 5.0 N / mm for endless workability.
It is excellent
Note 2) When the durability is 600,000 times or more in the flexing test, peeling or the like may occur.
It does not occur and has excellent durability
Claims (8)
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| JP2013022298A JP6149417B2 (en) | 2013-02-07 | 2013-02-07 | Coated rubber composition for conveyor belt |
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| EP3312229B1 (en) * | 2015-06-22 | 2019-07-17 | Bridgestone Corporation | Rubber composition, laminate, and conveyor belt |
| JP2017008207A (en) * | 2015-06-22 | 2017-01-12 | 株式会社ブリヂストン | Rubber composition, laminate, and conveyor belt |
| AU2016283645A1 (en) * | 2015-06-22 | 2017-12-21 | Bridgestone Corporation | Rubber composition, laminate, and conveyor belt |
| JP6758027B2 (en) * | 2015-06-22 | 2020-09-23 | 株式会社ブリヂストン | Rubber compositions, laminates, and conveyor belts |
| JP6725965B2 (en) * | 2015-06-22 | 2020-07-22 | 株式会社ブリヂストン | Rubber composition, laminate, and conveyor belt |
| EP3424997A4 (en) * | 2016-03-04 | 2019-03-06 | Bridgestone Corporation | Rubber composition, laminate body, and conveyer belt |
| JP6620040B2 (en) * | 2016-03-04 | 2019-12-11 | 株式会社ブリヂストン | Rubber composition, laminate, and conveyor belt |
| JP6616719B2 (en) * | 2016-03-24 | 2019-12-04 | 株式会社ブリヂストン | Rubber composition, crosslinked rubber composition, and rubber product |
| CN114525004A (en) * | 2021-12-31 | 2022-05-24 | 张家港爱科思汽车配件有限公司 | Damping shock-absorbing glue |
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