JP2016128549A - Coating rubber composition - Google Patents
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- JP2016128549A JP2016128549A JP2015003511A JP2015003511A JP2016128549A JP 2016128549 A JP2016128549 A JP 2016128549A JP 2015003511 A JP2015003511 A JP 2015003511A JP 2015003511 A JP2015003511 A JP 2015003511A JP 2016128549 A JP2016128549 A JP 2016128549A
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- rubber
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- diene rubber
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 99
- 239000005060 rubber Substances 0.000 title claims abstract description 99
- 239000000203 mixture Substances 0.000 title claims abstract description 59
- 239000011248 coating agent Substances 0.000 title abstract description 10
- 238000000576 coating method Methods 0.000 title abstract description 10
- 229920003244 diene elastomer Polymers 0.000 claims abstract description 101
- 239000006229 carbon black Substances 0.000 claims abstract description 86
- CLNYHERYALISIR-UHFFFAOYSA-N nona-1,3-diene Chemical compound CCCCCC=CC=C CLNYHERYALISIR-UHFFFAOYSA-N 0.000 claims abstract description 53
- 244000043261 Hevea brasiliensis Species 0.000 claims description 31
- 229920003052 natural elastomer Polymers 0.000 claims description 31
- 229920001194 natural rubber Polymers 0.000 claims description 31
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 229920005549 butyl rubber Polymers 0.000 claims description 9
- 229920001084 poly(chloroprene) Polymers 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 238000001179 sorption measurement Methods 0.000 claims description 5
- 229920000089 Cyclic olefin copolymer Polymers 0.000 claims description 4
- 239000005062 Polybutadiene Substances 0.000 claims description 4
- 229920002857 polybutadiene Polymers 0.000 claims description 4
- 229920001577 copolymer Polymers 0.000 claims description 3
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- 238000004132 cross linking Methods 0.000 description 8
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- 238000004898 kneading Methods 0.000 description 7
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- 238000012360 testing method Methods 0.000 description 7
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- OJOWICOBYCXEKR-KRXBUXKQSA-N (5e)-5-ethylidenebicyclo[2.2.1]hept-2-ene Chemical compound C1C2C(=C/C)/CC1C=C2 OJOWICOBYCXEKR-KRXBUXKQSA-N 0.000 description 2
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- PRBHEGAFLDMLAL-GQCTYLIASA-N (4e)-hexa-1,4-diene Chemical compound C\C=C\CC=C PRBHEGAFLDMLAL-GQCTYLIASA-N 0.000 description 1
- RIPYNJLMMFGZSX-UHFFFAOYSA-N (5-benzoylperoxy-2,5-dimethylhexan-2-yl) benzenecarboperoxoate Chemical compound C=1C=CC=CC=1C(=O)OOC(C)(C)CCC(C)(C)OOC(=O)C1=CC=CC=C1 RIPYNJLMMFGZSX-UHFFFAOYSA-N 0.000 description 1
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 1
- VBQCFYPTKHCPGI-UHFFFAOYSA-N 1,1-bis(2-methylpentan-2-ylperoxy)cyclohexane Chemical compound CCCC(C)(C)OOC1(OOC(C)(C)CCC)CCCCC1 VBQCFYPTKHCPGI-UHFFFAOYSA-N 0.000 description 1
- HSLFISVKRDQEBY-UHFFFAOYSA-N 1,1-bis(tert-butylperoxy)cyclohexane Chemical compound CC(C)(C)OOC1(OOC(C)(C)C)CCCCC1 HSLFISVKRDQEBY-UHFFFAOYSA-N 0.000 description 1
- OKIRBHVFJGXOIS-UHFFFAOYSA-N 1,2-di(propan-2-yl)benzene Chemical compound CC(C)C1=CC=CC=C1C(C)C OKIRBHVFJGXOIS-UHFFFAOYSA-N 0.000 description 1
- DMWVYCCGCQPJEA-UHFFFAOYSA-N 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane Chemical compound CC(C)(C)OOC(C)(C)CCC(C)(C)OOC(C)(C)C DMWVYCCGCQPJEA-UHFFFAOYSA-N 0.000 description 1
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 description 1
- YAQDPWONDFRAHF-UHFFFAOYSA-N 2-methyl-2-(2-methylpentan-2-ylperoxy)pentane Chemical compound CCCC(C)(C)OOC(C)(C)CCC YAQDPWONDFRAHF-UHFFFAOYSA-N 0.000 description 1
- WXDJDZIIPSOZAH-UHFFFAOYSA-N 2-methylpentan-2-yl benzenecarboperoxoate Chemical compound CCCC(C)(C)OOC(=O)C1=CC=CC=C1 WXDJDZIIPSOZAH-UHFFFAOYSA-N 0.000 description 1
- BIISIZOQPWZPPS-UHFFFAOYSA-N 2-tert-butylperoxypropan-2-ylbenzene Chemical compound CC(C)(C)OOC(C)(C)C1=CC=CC=C1 BIISIZOQPWZPPS-UHFFFAOYSA-N 0.000 description 1
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 1
- HLBZWYXLQJQBKU-UHFFFAOYSA-N 4-(morpholin-4-yldisulfanyl)morpholine Chemical compound C1COCCN1SSN1CCOCC1 HLBZWYXLQJQBKU-UHFFFAOYSA-N 0.000 description 1
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 1
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- LSDPWZHWYPCBBB-UHFFFAOYSA-N Methanethiol Chemical compound SC LSDPWZHWYPCBBB-UHFFFAOYSA-N 0.000 description 1
- 239000005642 Oleic acid Substances 0.000 description 1
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 235000019400 benzoyl peroxide Nutrition 0.000 description 1
- 239000003738 black carbon Substances 0.000 description 1
- BXIQXYOPGBXIEM-UHFFFAOYSA-N butyl 4,4-bis(tert-butylperoxy)pentanoate Chemical compound CCCCOC(=O)CCC(C)(OOC(C)(C)C)OOC(C)(C)C BXIQXYOPGBXIEM-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 235000012343 cottonseed oil Nutrition 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- AFZSMODLJJCVPP-UHFFFAOYSA-N dibenzothiazol-2-yl disulfide Chemical compound C1=CC=C2SC(SSC=3SC4=CC=CC=C4N=3)=NC2=C1 AFZSMODLJJCVPP-UHFFFAOYSA-N 0.000 description 1
- QYMFNZIUDRQRSA-UHFFFAOYSA-N dimethyl butanedioate;dimethyl hexanedioate;dimethyl pentanedioate Chemical compound COC(=O)CCC(=O)OC.COC(=O)CCCC(=O)OC.COC(=O)CCCCC(=O)OC QYMFNZIUDRQRSA-UHFFFAOYSA-N 0.000 description 1
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- 239000010410 layer Substances 0.000 description 1
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- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
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- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
本発明は、例えばゴムダンパ、建築用免震ゴム、ゴム支承、防舷材、ゴムホース等の各種ゴム部材の表面を被覆する被覆層のもとになる被覆ゴム組成物に関するものである。 The present invention relates to a coated rubber composition that serves as a coating layer for coating the surface of various rubber members such as rubber dampers, seismic isolation rubber for construction, rubber bearings, fenders, rubber hoses and the like.
上記各種ゴム部材の表面がオゾン劣化するのを防止するため、当該表面を被覆層で被覆して外気と直接に接触しないようにする場合がある。
かかる被覆層には、それ自体が高い耐オゾン性を有していることが求められる他、ゴム部材の変形に良好に追従して剥離したり裂けたりせずに当該ゴム部材の表面を被覆し続けることができるように、良好な引張特性（引張強さ、切断時伸び）や引裂特性（引裂強さ）等を有していることも求められる。
In order to prevent the surface of the various rubber members from deteriorating with ozone, the surface may be covered with a coating layer so as not to come into direct contact with the outside air.
In addition to being required to have high ozone resistance, such a coating layer itself is capable of covering the surface of the rubber member without following peeling and tearing following the deformation of the rubber member. In order to continue, it is also required to have good tensile properties (tensile strength, elongation at break), tear properties (tear strength), and the like.
そこで引張特性や引裂特性に優れ、なおかつゴム部材を形成するゴム組成物との加硫接着性を有する天然ゴム等のジエン系ゴムとともに、耐オゾン性に優れたエチレンプロピレンジエンゴム（ＥＰＤＭ）等の非ジエン系ゴムを併用して被覆ゴム組成物を調製するのが一般的である。またこれらの特性をさらに向上するべく、上記被覆ゴム組成物にカーボンブラック等の補強材を配合することも知られている。 Therefore, ethylene propylene diene rubber (EPDM), etc., which is excellent in ozone resistance, as well as diene rubbers such as natural rubber, which have excellent tensile properties and tear properties, and have vulcanization adhesion to rubber compositions forming rubber members. It is common to prepare a coated rubber composition using a non-diene rubber together. It is also known to add a reinforcing material such as carbon black to the coated rubber composition in order to further improve these characteristics.
しかし被覆ゴム組成物を調製する際の作業性や当該被覆ゴム組成物の生産性等を考慮して、従来の他のゴム組成物と同様にまずジエン系ゴムと非ジエン系ゴムとを配合して混練したのちさらにカーボンブラックを配合して混練するプレブレンド法では、カーボンブラックの大部分が被覆ゴム組成物を構成するジエン系ゴム相中に集中的に分散する結果、上記の各特性に優れた被覆層を形成できないことが知られている（非特許文献１等）。 However, in consideration of workability in preparing the coated rubber composition and productivity of the coated rubber composition, first, diene rubber and non-diene rubber are blended in the same manner as other conventional rubber compositions. In the pre-blend method, in which carbon black is further blended and kneaded, the majority of the carbon black is concentrated in the diene rubber phase constituting the coated rubber composition, resulting in excellent characteristics as described above. It is known that a coating layer cannot be formed (Non-patent Document 1, etc.).
すなわちジエン系ゴムからなるジエン系ゴム相中にカーボンブラックが偏って分散し、非ジエン系ゴム相はカーボンブラックによって十分に補強されていないことになるため、当該非ジエン系ゴム相が破壊の起点となって被覆層の引張特性や引裂特性が大きく低下したり、耐オゾン性が大きく低下したりするおそれがある。
カーボンブラックの全体量を増加させると、たとえその分散に偏りがあっても補強効果を高めて上記の各特性を向上させることはできる。しかしその場合には被覆ゴム組成物を調製するために各成分を配合して混練する際や、調製した被覆ゴム組成物を用いて各種ゴム部材の表面に被覆層を形成する際等の加工性が低下したり、形成した被覆層の特に低温での引張特性や引裂特性が低下したりする上、被覆ゴム組成物のコストアップに繋がるといった問題もある。
That is, carbon black is unevenly dispersed in the diene rubber phase composed of the diene rubber, and the non-diene rubber phase is not sufficiently reinforced by the carbon black. As a result, the tensile properties and tear properties of the coating layer may be greatly reduced, or the ozone resistance may be greatly reduced.
When the total amount of carbon black is increased, the above-mentioned characteristics can be improved by enhancing the reinforcing effect even if the dispersion is uneven. However, in that case, workability such as when blending and kneading each component to prepare a coated rubber composition, and when forming a coating layer on the surface of various rubber members using the prepared coated rubber composition, etc. In addition, there are problems such as a decrease in the tensile strength and tear properties of the formed coating layer, particularly at low temperatures, and an increase in the cost of the coated rubber composition.
カーボンブラックの全体量を増加させることなく非ジエン系ゴム相中に分散させるためには、あらかじめ非ジエン系ゴムにカーボンブラックを配合して混練したのちさらにジエン系ゴムを配合して混練する相混合法を採用すればよいことが知られている（非特許文献２等）。
ところが発明者の検討によると上記従来の相混合法では、非特許文献２の図２の結果からも明らかなように被覆層の耐オゾン性は大きく向上できるものの、当該被覆層の引張特性や引裂特性が大きく低下するという問題がある。
In order to disperse the carbon black in the non-diene rubber phase without increasing the total amount, the carbon black is premixed with the non-diene rubber and then kneaded with the diene rubber. It is known that the method may be adopted (Non-patent Document 2 etc.).
However, according to the inventor's study, the conventional phase mixing method can greatly improve the ozone resistance of the coating layer as is clear from the results of FIG. There is a problem that the characteristics are greatly reduced.
本発明の目的は、耐オゾン性、引張特性、および引裂特性の全てに優れた被覆層を形成しうる被覆ゴム組成物を提供することにある。 An object of the present invention is to provide a coated rubber composition capable of forming a coating layer excellent in all of ozone resistance, tensile properties, and tear properties.
本発明は、ジエン系ゴムからなりカーボンブラックを分散させたジエン系ゴム相、および非ジエン系ゴムからなりカーボンブラックを分散させた非ジエン系ゴム相を含み、前記ジエン系ゴム相中のカーボンブラックの質量ＷＤと前記非ジエン系ゴム相中のカーボンブラックの質量ＷＮとの比ＷＤ／ＷＮ＝４０／６０〜６０／４０である被覆ゴム組成物である。 The present invention includes a diene rubber phase comprising a diene rubber and having carbon black dispersed therein, and a non-diene rubber phase comprising a non-diene rubber and having carbon black dispersed therein, wherein the carbon black in the diene rubber phase The ratio WD / WN = 40/60 to 60/40 of the mass WD and the mass WN of the carbon black in the non-diene rubber phase.
本発明によれば、耐オゾン性、引張特性、および引裂特性の全てに優れた被覆層を形成しうる被覆ゴム組成物を提供できる。 ADVANTAGE OF THE INVENTION According to this invention, the coating rubber composition which can form the coating layer excellent in all of ozone resistance, a tensile characteristic, and a tearing characteristic can be provided.
従来は、ジエン系ゴム相と非ジエン系ゴム相にそれぞれどの程度の割合でカーボンブラックを分散させるかは一切検討されていなかった。
そこで発明者は上記の割合について鋭意検討した結果、ジエン系ゴム相中のカーボンブラックの質量ＷＤと非ジエン系ゴム相中のカーボンブラックの質量ＷＮとを比ＷＤ／ＷＮ＝４０／６０〜６０／４０の範囲に規定することにより、両ゴム相がともにカーボンブラックによって良好に補強されて耐オゾン性、引張特性、および引裂特性の全てに優れた被覆層を形成できることを見出した。
Conventionally, it has not been studied at what ratio each carbon black is dispersed in a diene rubber phase and a non-diene rubber phase.
Therefore, as a result of intensive studies on the above ratio, the inventor determined that the ratio WD / WN = 40/60 to 60 / of the mass WD of carbon black in the diene rubber phase and the mass WN of carbon black in the non-diene rubber phase. It was found that by defining it in the range of 40, both rubber phases were well reinforced with carbon black, and a coating layer excellent in all of ozone resistance, tensile properties, and tear properties could be formed.
すなわち上記の範囲よりジエン系ゴム相中のカーボンブラックが少ない場合には、当該ジエン系ゴム相がカーボンブラックによって十分に補強されないことになるため、先述したプレブレンド法によって調製した場合と同様にジエン系ゴム相が破壊の起点となって被覆層の引張特性や引裂特性が大きく低下したり、耐オゾン性が大きく低下したりする。
一方、上記の範囲よりジエン系ゴム相中のカーボンブラックが多い場合には、相対的に非ジエン系ゴム相がカーボンブラックによって十分に補強されないことになるため、先述した従来の相混合法によって調製した場合と同様に非ジエン系ゴム相が破壊の起点となって被覆層の引張特性や引裂特性が大きく低下したり、耐オゾン性が大きく低下したりする。
That is, when the amount of carbon black in the diene rubber phase is less than the above range, the diene rubber phase is not sufficiently reinforced by the carbon black. The system rubber phase becomes the starting point of destruction, and the tensile properties and tear properties of the coating layer are greatly reduced, and the ozone resistance is greatly reduced.
On the other hand, when there is more carbon black in the diene rubber phase than the above range, the non-diene rubber phase will not be sufficiently reinforced by the carbon black, so prepared by the conventional phase mixing method described above. In the same manner as described above, the non-diene rubber phase becomes a starting point of destruction, and the tensile properties and tear properties of the coating layer are greatly reduced, and the ozone resistance is greatly reduced.
これに対し比ＷＤ／ＷＮを上記の範囲に規定した本発明の被覆ゴム組成物によれば、両ゴム相をともにカーボンブラックによって十分に補強して耐オゾン性、引張特性、および引裂特性の全てに優れた被覆層を形成することが可能となる。
また、特に非ジエン系ゴム相中により多くのカーボンブラックを分散させるのが上記各特性をさらに向上する上で好ましいことから、当該カーボンブラックの質量ＷＤ、ＷＮはＷＤ＜ＷＮであるのが好ましい。
On the other hand, according to the coated rubber composition of the present invention in which the ratio WD / WN is defined in the above range, both the rubber phases are sufficiently reinforced with carbon black, and all of ozone resistance, tensile properties, and tear properties are obtained. It is possible to form an excellent coating layer.
In particular, it is preferable to disperse more carbon black in the non-diene rubber phase in order to further improve the above characteristics. Therefore, the masses WD and WN of the carbon black are preferably WD <WN.
ただし上記比ＷＤ／ＷＮの範囲でもＷＮが上限側に近づくほど引裂特性については低下する傾向があるため、当該比ＷＤ／ＷＮ＜５５／４５であるのが好ましい。
さらにカーボンブラックの総量（ＷＤ＋ＷＮ）は、ジエン系ゴムと非ジエン系ゴムの総量１００質量部あたり１０質量部以上、特に２０質量部以上であるのが好ましく、５０質量部以下、特に４０質量部以下であるのが好ましい。
However, the ratio WD / WN <55/45 is preferable because the tear property tends to decrease as WN approaches the upper limit side even in the range of the ratio WD / WN.
Further, the total amount of carbon black (WD + WN) is preferably 10 parts by mass or more, particularly 20 parts by mass or more, especially 50 parts by mass or less, particularly 40 parts by mass or less, per 100 parts by mass of the total amount of diene rubber and non-diene rubber. Is preferred.
この範囲よりカーボンブラックの総量が少ない場合には両相をカーボンブラックによって十分に補強できないため耐オゾン性、引張特性、および引裂特性が不十分になるおそれがある。
一方、上記の範囲よりカーボンブラックの総量が多い場合には、前述したように被覆ゴム組成物を調製する際や被覆層を形成する際の加工性が低下したり、形成した被覆層の特に低温での引張特性や引裂特性が低下したりするおそれがある上、被覆ゴム組成物のコストアップに繋がるおそれもある。
If the total amount of carbon black is less than this range, both phases cannot be sufficiently reinforced with carbon black, and ozone resistance, tensile properties, and tear properties may be insufficient.
On the other hand, when the total amount of carbon black is larger than the above range, the processability when preparing the coating rubber composition or forming the coating layer as described above may be reduced, or the coating layer formed may have a particularly low temperature. There is a risk that the tensile properties and tearing properties of the coating rubber may be lowered, and the cost of the coated rubber composition may be increased.
〈ジエン系ゴム〉
ジエン系ゴム相を形成するジエン系ゴムとしては、先述したようにゴム部材を形成するゴム組成物との加硫接着性を有する例えば天然ゴム、イソプレンゴム（ＩＲ）、ブタジエンゴム（ＢＲ）、スチレンブタジエンゴム（ＳＢＲ）、およびクロロプレンゴム（ＣＲ）からなる群より選ばれた少なくとも１種が挙げられる。
<Diene rubber>
As the diene rubber forming the diene rubber phase, as described above, for example, natural rubber, isoprene rubber (IR), butadiene rubber (BR), styrene having vulcanization adhesion with the rubber composition forming the rubber member. Examples thereof include at least one selected from the group consisting of butadiene rubber (SBR) and chloroprene rubber (CR).
特に引張特性や引裂特性に優れるとともに汎用性の高い天然ゴム、ＳＢＲ、ＣＲが好ましく、特に天然ゴムが好ましい。
またこれらジエン系ゴムとしてはそれぞれ伸展油を加えて柔軟性を調整した油展タイプのものと加えない非油展タイプのものとがあるが、このいずれも使用可能である。
上記ジエン系ゴムの１種または２種以上を使用できる。
In particular, natural rubber, SBR, and CR that are excellent in tensile properties and tear properties and highly versatile are preferable, and natural rubber is particularly preferable.
These diene rubbers are classified into an oil-extended type in which flexibility is adjusted by adding an extending oil and a non-oil-extended type in which flexibility is not added, either of which can be used.
One or more of the above diene rubbers can be used.
〈非ジエン系ゴム〉
非ジエン系ゴム相を形成する非ジエン系ゴムとしては、ジエン系ゴムよりも耐オゾン性に優れた、例えばイソブチレン−イソプレンゴム（ブチルゴム、ＩＩＲ）、エチレンプロピレンゴム（ＥＰＭ）等のエチレン−α−オレフィン共重合ゴム、およびエチレンプロピレンジエンゴム（ＥＰＤＭ）等のエチレン−α−オレフィン−非共役ポリエン共重合ゴムからなる群より選ばれた少なくとも１種が挙げられる。
<Non-diene rubber>
The non-diene rubber forming the non-diene rubber phase is superior in ozone resistance to the diene rubber, for example, ethylene-α- such as isobutylene-isoprene rubber (butyl rubber, IIR), ethylene propylene rubber (EPM), etc. Examples thereof include at least one selected from the group consisting of an olefin copolymer rubber and an ethylene-α-olefin-nonconjugated polyene copolymer rubber such as ethylene propylene diene rubber (EPDM).
特に汎用性の高いＥＰＭ、ＥＰＤＭが好ましい。
このうちＥＰＭとしては、エチレンとプロピレンを任意の割合で共重合させた種々のＥＰＭがいずれも使用可能である。
またＥＰＭとしては、伸展油を加えて柔軟性を調整した油展タイプのものと加えない非油展タイプのものとがあるが、このいずれも使用可能である。
In particular, highly versatile EPM and EPDM are preferable.
Among these, as the EPM, any of various EPMs obtained by copolymerizing ethylene and propylene at an arbitrary ratio can be used.
Further, as EPM, there are an oil-extended type in which flexibility is adjusted by adding an extending oil and a non-oil-extended type in which flexibility is not added, either of which can be used.
これらＥＰＭの１種または２種以上を使用できる。
ＥＰＭは主鎖中に二重結合を有しないため、被覆層の耐オゾン性、耐老化性、耐熱性を向上する効果に特に優れている。
またＥＰＤＭとしては、エチレンとプロピレンに少量の第３成分（ジエン分）を加えることで主鎖中に二重結合を導入した種々のＥＰＤＭがいずれも使用可能である。
One or more of these EPMs can be used.
Since EPM does not have a double bond in the main chain, it is particularly excellent in the effect of improving the ozone resistance, aging resistance and heat resistance of the coating layer.
As the EPDM, any of various EPDMs in which a double bond is introduced into the main chain by adding a small amount of a third component (diene component) to ethylene and propylene can be used.
ＥＰＤＭとしては、第３成分の種類や量の違いによる様々な製品が提供されている。代表的な第３成分としては、例えばエチリデンノルボルネン（ＥＮＢ）、１，４−ヘキサジエン（１，４−ＨＤ）、ジシクロペンタジエン（ＤＣＰ）等が挙げられる。
ＥＰＤＭとしても、伸展油を加えて柔軟性を調整した油展タイプのものと加えない非油展タイプのものとがあるが、このいずれも使用可能である。
As EPDM, various products are provided depending on the kind and amount of the third component. Representative examples of the third component include ethylidene norbornene (ENB), 1,4-hexadiene (1,4-HD), dicyclopentadiene (DCP), and the like.
As EPDM, there are an oil-extended type in which flexibility is adjusted by adding an extending oil and a non-oil-extended type in which flexibility is not added, either of which can be used.
これらＥＰＤＭの１種または２種以上を使用できる。
ＥＰＤＭはＥＰＭに比べて耐オゾン性がごく僅かに低いものの、例えば硫黄架橋系の架橋成分を用いて架橋させることが可能で汎用性に優れているという利点がある。
〈配合割合〉
ジエン系ゴムと非ジエン系ゴムとは、先述した各特性をいずれも良好に維持しうる任意の割合で配合できるものの、非ジエン系ゴムの配合割合は、上記２種のゴムの総量１００質量部中の１０質量部以上、特に２０質量部以上であるのが好ましく、５０質量部以下、特に３０質量部以下であるのが好ましい。
One or more of these EPDMs can be used.
Although EPDM has a slightly lower ozone resistance than EPM, it has an advantage that it can be cross-linked using, for example, a sulfur cross-linking component and is excellent in versatility.
<Combination ratio>
Although the diene rubber and the non-diene rubber can be blended in any ratio that can maintain the above-mentioned characteristics well, the blend ratio of the non-diene rubber is 100 parts by mass of the total amount of the above two kinds of rubbers. It is preferably 10 parts by mass or more, particularly 20 parts by mass or more, and preferably 50 parts by mass or less, particularly 30 parts by mass or less.
非ジエン系ゴムの配合割合がこの範囲未満では被覆層の耐オゾン性が不十分になるおそれがある。一方、非ジエン系ゴムの配合割合が上記の範囲を超える場合には、相対的にジエン系ゴムの割合が少なくなって被覆層の引張特性や引裂特性が低下したり、ゴム部材を形成するゴム組成物との加硫接着性が不十分になったりするおそれがある。
これに対し非ジエン系ゴムの配合割合を上記の範囲とすることで耐オゾン性、耐老化性、耐熱性にさらに優れた被覆層を形成できる。
If the blending ratio of the non-diene rubber is less than this range, the coating layer may have insufficient ozone resistance. On the other hand, when the blending ratio of the non-diene rubber exceeds the above range, the ratio of the diene rubber is relatively decreased, and the tensile characteristics and tear characteristics of the coating layer are lowered, or the rubber forming the rubber member There is a possibility that the vulcanization adhesiveness with the composition may be insufficient.
On the other hand, the coating layer which was further excellent in ozone resistance, aging resistance, and heat resistance can be formed by making the compounding ratio of non-diene rubber into the above range.
すなわち非ジエン系ゴムの配合割合を上記の範囲とすることで、被覆ゴム組成物を、ジエン系ゴム相の連続相中に非ジエン系ゴム相が不連続に分散された分散構造とすることができ、上記連続相によって被覆層の一体性を高めて引張特性や引裂特性を向上できるとともに、当該被覆層のゴム組成物との加硫接着性を向上できる。
また、例えば連続相にアタックしたオゾンを上記連続相中に不連続に分散された非ジエン系ゴム相によって良好に停止できるため、被覆層の耐オゾン性を向上できる。
That is, by setting the blending ratio of the non-diene rubber within the above range, the coated rubber composition can have a dispersed structure in which the non-diene rubber phase is discontinuously dispersed in the continuous phase of the diene rubber phase. In addition, the continuous phase can enhance the integrity of the coating layer to improve tensile properties and tearing properties, and can improve the vulcanization adhesion of the coating layer to the rubber composition.
Further, for example, ozone attacked in the continuous phase can be satisfactorily stopped by the non-diene rubber phase dispersed discontinuously in the continuous phase, so that the ozone resistance of the coating layer can be improved.
なお配合割合は、いずれかのゴムが油展タイプのものである場合、伸展油を除いた固形分としてのゴム自体の割合が上記の範囲となるように設定する。
〈カーボンブラック〉
カーボンブラックとしては、ゴムに対して補強剤として機能しうる種々のカーボンブラックが使用可能である。
The blending ratio is set so that, when any rubber is of the oil-extended type, the ratio of the rubber itself as a solid content excluding the extending oil falls within the above range.
<Carbon black>
As carbon black, various carbon blacks which can function as a reinforcing agent for rubber can be used.
特に両ゴムへの補強効果の点で、窒素吸着比表面積が４０ｍ２／ｇ以上であるカーボンブラックが好適に使用される。
窒素吸着比表面積が上記範囲未満のカーボンブラックでは両ゴム、特に非ジエン系ゴムに対する補強効果が十分に得られないおそれがある。
なお窒素吸着比表面積は、両ゴムへの良好な分散性を確保すること等を考慮すると１５０ｍ２／ｇ以下、特に６０ｍ２／ｇ以下であるのが好ましい。
In particular, carbon black having a nitrogen adsorption specific surface area of 40 m 2 / g or more is preferably used from the viewpoint of the reinforcing effect on both rubbers.
Carbon black having a nitrogen adsorption specific surface area of less than the above range may not provide a sufficient reinforcing effect on both rubbers, particularly non-diene rubbers.
The nitrogen adsorption specific surface area is preferably 150 m 2 / g or less, particularly preferably 60 m 2 / g or less in consideration of ensuring good dispersibility in both rubbers.
〈比ＷＤ／ＷＮ〉
ジエン系ゴム相中のカーボンブラックの質量ＷＤと前記非ジエン系ゴム相中のカーボンブラックの質量ＷＮとの比ＷＤ／ＷＮを前述した範囲に調整するためには、例えば前述した相混合法を応用した下記の方法等が採用される。
すなわち、非ジエン系ゴムに所定量のカーボンブラックを配合し、混練して調製したマスターバッチと、ジエン系ゴムに所定量のカーボンブラックを配合し、混練して調製したマスターバッチとを用意し、両マスターバッチを所定の配合割合で配合して混練する。
<Ratio WD / WN>
In order to adjust the ratio WD / WN between the mass WD of carbon black in the diene rubber phase and the mass WN of carbon black in the non-diene rubber phase to the above-mentioned range, for example, the above-described phase mixing method is applied. The following methods are adopted.
That is, a master batch prepared by blending and kneading a predetermined amount of carbon black with a non-diene rubber, and a master batch prepared by kneading and blending a predetermined amount of carbon black with a diene rubber, Both master batches are mixed at a predetermined mixing ratio and kneaded.
この方法では、それぞれのマスターバッチ中に取り込まれたカーボンブラックが混練によって相間で大きく移行することはない。軟化剤を含む系では相間でのカーボンブラックの移行が多少増加する場合があるが、いずれにしろ組み合わせるジエン系ゴム、非ジエン系ゴム、およびカーボンブラックの種類と配合割合や軟化剤の量と、カーボンブラックの移行率との間の相関関係をあらかじめ把握しておけば、混練によって調製される被覆ゴム組成物における比ＷＤ／ＷＮを、両ゴムに配合するカーボンブラックの量によって任意に制御できる。 In this method, the carbon black taken in each master batch does not greatly shift between phases by kneading. In systems containing softeners, the transition of carbon black between phases may increase somewhat, but in any case the types and blending ratios of diene rubbers, non-diene rubbers, and carbon blacks, and the amount of softeners, If the correlation between the transfer rate of carbon black is known in advance, the ratio WD / WN in the coated rubber composition prepared by kneading can be arbitrarily controlled by the amount of carbon black blended in both rubbers.
〈架橋成分〉
本発明の被覆ゴム組成物には、ゴム分を架橋させるとともにゴム部材と加硫接着させるための架橋成分を配合する。
非ジエン系ゴムのうちＥＰＤＭ等のエチレン−α−オレフィン−非共役ポリエン共重合ゴムやＩＩＲはジエン系ゴムとともに硫黄加硫が可能であるため、架橋成分としては硫黄や、例えば４，４′−ジチオジモルホリン（Ｒ）等の含硫黄系加硫剤（分子中に硫黄を有する有機化合物）などの硫黄加硫系の架橋剤が挙げられる。
<Crosslinking component>
The coated rubber composition of the present invention is blended with a crosslinking component for crosslinking the rubber component and vulcanizing and bonding with the rubber member.
Among non-diene rubbers, ethylene-α-olefin-non-conjugated polyene copolymer rubbers such as EPDM and IIR can be sulfur vulcanized together with diene rubbers. Therefore, sulfur, for example, 4,4′- Sulfur-containing crosslinking agents such as dithiodimorpholine (R) and other sulfur-containing vulcanizing agents (organic compounds having sulfur in the molecule) can be mentioned.
また上記硫黄加硫系の架橋剤とともに種々の促進剤、促進助剤を配合することもできる。
このうち促進剤としては、例えば２−メルカプトベンゾチアゾール（Ｍ）、ジ-２−ベンゾチアゾリルジスルフィド（ＤＭ）、テトラメチルチウラムモノスルフィド（ＴＳ）、テトラメチルチウラムジスルフィド（ＴＴ）、テトラエチルチウラムジスルフィド（ＴＥＴ）等の１種または２種以上が挙げられる。
Various accelerators and accelerator aids can be blended with the sulfur vulcanizing crosslinking agent.
Among them, examples of the accelerator include 2-mercaptobenzothiazole (M), di-2-benzothiazolyl disulfide (DM), tetramethylthiuram monosulfide (TS), tetramethylthiuram disulfide (TT), tetraethylthiuram disulfide. 1 type or 2 types or more, such as (TET), is mentioned.
また促進助剤としては、例えば酸化亜鉛（亜鉛華）等の金属酸化物や、ステアリン酸、オレイン酸、綿実脂肪酸等の脂肪酸などの１種または２種以上が挙げられる。
また非ジエン系ゴムがＥＰＭ等のエチレン−α−オレフィン共重合ゴムである場合、かかるエチレン−α−オレフィン共重合ゴムは硫黄加硫できないため、架橋成分としてはさらに過酸化物架橋剤を併用する。
Examples of the promoter aid include one or more metal oxides such as zinc oxide (zinc white) and fatty acids such as stearic acid, oleic acid, and cottonseed fatty acid.
Further, when the non-diene rubber is an ethylene-α-olefin copolymer rubber such as EPM, the ethylene-α-olefin copolymer rubber cannot be sulfur vulcanized, and therefore a peroxide crosslinking agent is used in combination as a crosslinking component. .
過酸化物架橋剤としては、例えばジベンゾイルパーオキサイド、ジクミルパーオキサイド、２，５−ジメチル−２，５−ジ（ｔ−ブチルパーオキシ）ヘキサン、α，α′−ジ（ｔ−ブチルパーオキシ）ジイソプロピルベンゼン、ｔ−ブチルクミルパーオキサイド、ジ−ｔ−ヘキシルパーオキサイド、ジ−ｔ−ブチルパーオキサイド、２，５−ジメチル−２，５−ビス（ｔ−ブチルパーオキシ）へキシン−３、１，１−ジ（ｔ−ヘキシルパーオキシ）シクロヘキサン、１，１−ジ（ｔ−ブチルパーオキシ）シクロヘキサン、ｎ−ブチル−４，４−ジ（ｔ−ブチルパーオキシ）バレレート、２，５−ジメチル−２，５−ジ（ベンゾイルパーオキシ）ヘキサン、ｔ−ヘキシルパーオキシベンゾエート、ｔ−ブチルパーオキシベンゾエート等の１種または２種以上が挙げられる。 Examples of the peroxide crosslinking agent include dibenzoyl peroxide, dicumyl peroxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, α, α'-di (t-butylperoxide). Oxy) diisopropylbenzene, t-butylcumyl peroxide, di-t-hexyl peroxide, di-t-butyl peroxide, 2,5-dimethyl-2,5-bis (t-butylperoxy) hexyne-3 1,1-di (t-hexylperoxy) cyclohexane, 1,1-di (t-butylperoxy) cyclohexane, n-butyl-4,4-di (t-butylperoxy) valerate, 2,5 -One kind of dimethyl-2,5-di (benzoylperoxy) hexane, t-hexylperoxybenzoate, t-butylperoxybenzoate, etc. There are two or more types.
上記各種架橋成分の配合割合は、ゴム分や架橋成分の種類や組み合わせ等に応じて適宜設定できる。
〈その他の成分〉
本発明の被覆ゴム組成物には、必要に応じて可塑剤等の各種添加剤を配合してもよい。
可塑剤は、特に非油展のゴムを用いた被覆ゴム組成物の加工性を向上するとともに当該被覆ゴム層を架橋して形成される被覆層に柔軟性を付与するための成分であって、当該可塑剤としては、例えばジオクチルフタレート（ＤＯＰ）等のフタル酸エステル系可塑剤やビス（２−エチルへキシル）アゼレート（ＤＯＺ）等の脂肪族二塩基酸エステル系可塑剤等の１種または２種以上が挙げられる。
The blending ratio of the various crosslinking components can be appropriately set according to the rubber content, the type and combination of the crosslinking components, and the like.
<Other ingredients>
You may mix | blend various additives, such as a plasticizer, with the covering rubber composition of this invention as needed.
The plasticizer is a component for improving the processability of a coated rubber composition using a non-oil-extended rubber and imparting flexibility to a coating layer formed by crosslinking the coating rubber layer, Examples of the plasticizer include one or two of a phthalate ester plasticizer such as dioctyl phthalate (DOP) and an aliphatic dibasic ester plasticizer such as bis (2-ethylhexyl) azelate (DOZ). More than species.
可塑剤の配合割合は、組み合わせるゴムの種類や配合割合等と、被覆ゴム組成物に求められる加工性や被覆層に求められる柔軟性等に応じて任意に設定できるものの、ジエン系ゴムと非ジエン系ゴムの総量１００質量部あたり１質量部以上であるのが好ましく、１０質量部以下であるのが好ましい。
本発明の被覆ゴム組成物には、さらに必要に応じて老化防止剤、オイル、液状ゴムその他の各種添加剤を任意の割合で配合してもよい。
The blending ratio of the plasticizer can be arbitrarily set according to the type and blending ratio of the rubber to be combined and the processability required for the coating rubber composition, the flexibility required for the coating layer, etc., but diene rubber and non-diene The amount is preferably 1 part by mass or more and preferably 10 parts by mass or less per 100 parts by mass of the total amount of the system rubber.
The coated rubber composition of the present invention may further contain an antioxidant, oil, liquid rubber, and other various additives at an arbitrary ratio, if necessary.
〈実施例１〉
ジエン系ゴムとしての天然ゴム（ＴＳＲ２０品）７０質量部にカーボンブラック〔ＦＥＦ、窒素吸着比表面積：４２ｍ２／ｇ、東海カーボン(株)製のシーストＳＯ〕１７．５質量部を配合し、混練してジエン系ゴムのマスターバッチを調製するとともに、非ジエン系ゴムとしてのＥＰＤＭ〔エチレン含量：５０％、ジエン含量：９．５％、非油展、住友化学(株)製のエスプレン（登録商標）５０５Ａ〕３０質量部に上記と同じカーボンブラック１２.５質量部を配合し、混練して非ジエン系ゴムのマスターバッチを調製した。
<Example 1>
Blending 70 parts by mass of natural rubber (TSR20 product) as a diene rubber with 17.5 parts by mass of carbon black (FEF, nitrogen adsorption specific surface area: 42 m 2 / g, SEAST SO manufactured by Tokai Carbon Co., Ltd.) In addition to preparing a master batch of diene rubber, EPDM as a non-diene rubber [ethylene content: 50%, diene content: 9.5%, non-oil extended, Esprene (registered trademark) manufactured by Sumitomo Chemical Co., Ltd. 505A] 12.5 parts by mass of the same carbon black as above was blended with 30 parts by mass and kneaded to prepare a master batch of non-diene rubber.
そして相混合法を応用して、まず両マスターバッチを素練りしながら、可塑剤としてのＤＯＺ〔大八化学工業(株)製〕５質量部を加えて混練し、ついで架橋剤としての粉末硫黄０．５質量部を加えてさらに混練して被覆ゴム組成物を調製した。
カーボンブラックの総量（ＷＤ＋ＷＮ）は、天然ゴムとＥＰＤＭの総量１００質量部あたり３０質量部、ＥＰＤＭの配合割合は、天然ゴムとＥＰＤＭの総量１００質量部中の３０質量部であった。
Then, applying the phase mixing method, first kneading both masterbatches, adding 5 parts by mass of DOZ (made by Daihachi Chemical Industry Co., Ltd.) as a plasticizer, kneading, and then powder sulfur as a crosslinking agent 0.5 parts by mass was added and further kneaded to prepare a coated rubber composition.
The total amount of carbon black (WD + WN) was 30 parts by mass per 100 parts by mass of the total amount of natural rubber and EPDM, and the blending ratio of EPDM was 30 parts by mass in the total amount of 100 parts by mass of natural rubber and EPDM.
〈実施例２〉
天然ゴム７０質量部に対するカーボンブラックの配合割合を１６．５質量部、ＥＰＤＭ３０質量部に対するカーボンブラックの配合割合を１３．５質量部としたこと以外は実施例１と同様にして被覆ゴム組成物を調製した。
カーボンブラックの総量（ＷＤ＋ＷＮ）は、天然ゴムとＥＰＤＭの総量１００質量部あたり３０質量部、ＥＰＤＭの配合割合は、天然ゴムとＥＰＤＭの総量１００質量部中の３０質量部であった。
<Example 2>
A coated rubber composition was prepared in the same manner as in Example 1 except that the blending ratio of carbon black to 70 parts by weight of natural rubber was 16.5 parts by weight, and the blending ratio of carbon black to 30 parts by weight of EPDM was 13.5 parts by weight. Prepared.
The total amount of carbon black (WD + WN) was 30 parts by mass per 100 parts by mass of the total amount of natural rubber and EPDM, and the blending ratio of EPDM was 30 parts by mass in the total amount of 100 parts by mass of natural rubber and EPDM.
〈実施例３〉
天然ゴム７０質量部に対するカーボンブラックの配合割合を１４．５質量部、ＥＰＤＭ３０質量部に対するカーボンブラックの配合割合を１５．５質量部としたこと以外は実施例１と同様にして被覆ゴム組成物を調製した。
カーボンブラックの総量（ＷＤ＋ＷＮ）は、天然ゴムとＥＰＤＭの総量１００質量部あたり３０質量部、ＥＰＤＭの配合割合は、天然ゴムとＥＰＤＭの総量１００質量部中の３０質量部であった。
<Example 3>
A coated rubber composition was prepared in the same manner as in Example 1 except that the blending ratio of carbon black with respect to 70 parts by weight of natural rubber was 14.5 parts by weight, and the blending ratio of carbon black with respect to 30 parts by weight of EPDM was 15.5 parts by weight. Prepared.
The total amount of carbon black (WD + WN) was 30 parts by mass per 100 parts by mass of the total amount of natural rubber and EPDM, and the blending ratio of EPDM was 30 parts by mass in the total amount of 100 parts by mass of natural rubber and EPDM.
〈実施例４〉
天然ゴム７０質量部に対するカーボンブラックの配合割合を１２．０質量部、ＥＰＤＭ３０質量部に対するカーボンブラックの配合割合を１８．０質量部としたこと以外は実施例１と同様にして被覆ゴム組成物を調製した。
カーボンブラックの総量（ＷＤ＋ＷＮ）は、天然ゴムとＥＰＤＭの総量１００質量部あたり３０質量部、ＥＰＤＭの配合割合は、天然ゴムとＥＰＤＭの総量１００質量部中の３０質量部であった。
<Example 4>
A coated rubber composition was prepared in the same manner as in Example 1 except that the blending ratio of carbon black to 70 parts by weight of natural rubber was 12.0 parts by weight, and the blending ratio of carbon black to 30 parts by weight of EPDM was 18.0 parts by weight. Prepared.
The total amount of carbon black (WD + WN) was 30 parts by mass per 100 parts by mass of the total amount of natural rubber and EPDM, and the blending ratio of EPDM was 30 parts by mass in the total amount of 100 parts by mass of natural rubber and EPDM.
〈実施例５〉
天然ゴムに代えてＳＢＲ〔Ｅ−ＳＢＲ、結合スチレン量中心値２３．５％、非油展、日本ゼオン(株)製のＮｉｐｏｌ（登録商標）１５０２〕を同量配合したこと以外は実施例３と同様にして被覆ゴム組成物を調製した。
カーボンブラックの総量（ＷＤ＋ＷＮ）は、ＳＢＲとＥＰＤＭの総量１００質量部あたり３０質量部、ＥＰＤＭの配合割合は、ＳＢＲとＥＰＤＭの総量１００質量部中の３０質量部であった。
<Example 5>
Example 3 except that the same amount of SBR [E-SBR, bound styrene content center value 23.5%, non-oil-extended, Nipol (registered trademark) 1502 manufactured by Nippon Zeon Co., Ltd.] was used instead of natural rubber. A coated rubber composition was prepared in the same manner as described above.
The total amount of carbon black (WD + WN) was 30 parts by mass per 100 parts by mass of the total amount of SBR and EPDM, and the blending ratio of EPDM was 30 parts by mass in the total amount of 100 parts by mass of SBR and EPDM.
〈実施例６〉
天然ゴムに代えてＣＲ〔メルカプタン変性タイプ、昭和電工(株)製のショウプレン（登録商標）ＷＲＴ〕を同量配合したこと以外は実施例３と同様にして被覆ゴム組成物を調製した。
カーボンブラックの総量（ＷＤ＋ＷＮ）は、ＣＲとＥＰＤＭの総量１００質量部あたり３０質量部、ＥＰＤＭの配合割合は、ＣＲとＥＰＤＭの総量１００質量部中の３０質量部であった。
<Example 6>
A coated rubber composition was prepared in the same manner as in Example 3 except that the same amount of CR [mercaptan modified type, Showrene (registered trademark) WRT manufactured by Showa Denko KK] was used instead of natural rubber.
The total amount of carbon black (WD + WN) was 30 parts by mass per 100 parts by mass of the total amount of CR and EPDM, and the blending ratio of EPDM was 30 parts by mass in the total amount of 100 parts by mass of CR and EPDM.
〈実施例７〉
ＥＰＤＭに代えてＩＩＲ〔ＪＳＲ(株)製のＪＳＲ（登録商標）ＢＵＴＹＬ ２６８〕を同量配合したこと以外は実施例３と同様にして被覆ゴム組成物を調製した。
カーボンブラックの総量（ＷＤ＋ＷＮ）は、天然ゴムとＩＩＲの総量１００質量部あたり３０質量部、ＩＩＲの配合割合は、天然ゴムとＩＩＲの総量１００質量部中の３０質量部であった。
<Example 7>
A coated rubber composition was prepared in the same manner as in Example 3 except that the same amount of IIR [JSR (registered trademark) BUTYL 268 manufactured by JSR Corporation] was used instead of EPDM.
The total amount of carbon black (WD + WN) was 30 parts by mass per 100 parts by mass of the total amount of natural rubber and IIR, and the blending ratio of IIR was 30 parts by mass in the total amount of 100 parts by mass of natural rubber and IIR.
〈比較例１〉
プレブレンド法により、まず天然ゴム７０質量部とＥＰＤＭ３０質量部とを配合して混練し、次いでカーボンブラック３０質量部、およびＤＯＺ５質量部を順に配合して混練したのち、粉末硫黄０．５質量部を加えてさらに混練して被覆ゴム組成物を調製した。
カーボンブラックの総量は、天然ゴムとＥＰＤＭの総量１００質量部あたり３０質量部、ＥＰＤＭの配合割合は、天然ゴムとＥＰＤＭの総量１００質量部中の３０質量部であった。
<Comparative example 1>
First, 70 parts by weight of natural rubber and 30 parts by weight of EPDM are blended and kneaded by the pre-blend method, and then 30 parts by weight of carbon black and 5 parts by weight of DOZ are blended and kneaded in order, and then 0.5 parts by weight of powdered sulfur. Was added and kneaded to prepare a coated rubber composition.
The total amount of carbon black was 30 parts by mass per 100 parts by mass of natural rubber and EPDM, and the blending ratio of EPDM was 30 parts by mass in 100 parts by mass of natural rubber and EPDM.
〈比較例２〉
天然ゴム７０質量部に対するカーボンブラックの配合割合を１９．０質量部、ＥＰＤＭ３０質量部に対するカーボンブラックの配合割合を１１．０質量部としたこと以外は実施例１と同様にして被覆ゴム組成物を調製した。
カーボンブラックの総量（ＷＤ＋ＷＮ）は、天然ゴムとＥＰＤＭの総量１００質量部あたり３０質量部、ＥＰＤＭの配合割合は、天然ゴムとＥＰＤＭの総量１００質量部中の３０質量部であった。
<Comparative example 2>
A coated rubber composition was prepared in the same manner as in Example 1 except that the blending ratio of carbon black to 70 parts by weight of natural rubber was 19.0 parts by weight and the blending ratio of carbon black to 30 parts by weight of EPDM was 11.0 parts by weight. Prepared.
The total amount of carbon black (WD + WN) was 30 parts by mass per 100 parts by mass of the total amount of natural rubber and EPDM, and the blending ratio of EPDM was 30 parts by mass in the total amount of 100 parts by mass of natural rubber and EPDM.
〈比較例３〉
天然ゴム７０質量部に対するカーボンブラックの配合割合を１１．０質量部、ＥＰＤＭ３０質量部に対するカーボンブラックの配合割合を１９．０質量部としたこと以外は実施例１と同様にして被覆ゴム組成物を調製した。
カーボンブラックの総量（ＷＤ＋ＷＮ）は、天然ゴムとＥＰＤＭの総量１００質量部あたり３０質量部、ＥＰＤＭの配合割合は、天然ゴムとＥＰＤＭの総量１００質量部中の３０質量部であった。
<Comparative Example 3>
A coated rubber composition was prepared in the same manner as in Example 1 except that the compounding ratio of carbon black to 70 parts by mass of natural rubber was 11.0 parts by mass, and the compounding ratio of carbon black to 30 parts by mass of EPDM was 19.0 parts by mass. Prepared.
The total amount of carbon black (WD + WN) was 30 parts by mass per 100 parts by mass of the total amount of natural rubber and EPDM, and the blending ratio of EPDM was 30 parts by mass in the total amount of 100 parts by mass of natural rubber and EPDM.
〈比ＷＤ／ＷＮ〉
上記実施例１〜７、比較例１〜３で調製した被覆ゴム組成物を縦１３０ｍｍ×横１３０ｍｍ×厚み２ｍｍのシート状に成形して１５０℃で３０分間架橋させて架橋ゴムスラブシートを作製した。
次いで上記架橋ゴムスラブシートから測定用の試験片を切り出し、走査型プローブ顕微鏡写真を撮影して画像解析して、ジエン系ゴム相中のカーボンブラックの質量ＷＤと前記非ジエン系ゴム相中のカーボンブラックの質量ＷＮとの比ＷＤ／ＷＮを求めた。
<Ratio WD / WN>
The coated rubber compositions prepared in Examples 1 to 7 and Comparative Examples 1 to 3 were molded into a sheet of length 130 mm × width 130 mm × thickness 2 mm and crosslinked at 150 ° C. for 30 minutes to prepare a crosslinked rubber slab sheet. .
Next, a test piece for measurement was cut out from the crosslinked rubber slab sheet, a scanning probe micrograph was taken and image analysis was performed, and the mass WD of carbon black in the diene rubber phase and the carbon in the non-diene rubber phase were analyzed. The ratio WD / WN to the mass WN of black was determined.
〈耐オゾン性〉
上記実施例１〜７、比較例１〜３で調製した被覆ゴム組成物を幅５２ｍｍ×長さ４５ｍｍ×厚み２ｍｍのシート状に成形して１５０℃で３０分間架橋させたのち、サンプルの中央部が長さ方向へ２０％伸長されるように治具を用いて固定した状態で試験温度４０℃、オゾン濃度１００ｐｐｈｍの条件でオゾンに曝し続けた際に、その表面や側面にクラックが発生するまでの時間を計測した。
<Ozone resistance>
The coated rubber compositions prepared in Examples 1 to 7 and Comparative Examples 1 to 3 were molded into a sheet of width 52 mm × length 45 mm × thickness 2 mm and crosslinked at 150 ° C. for 30 minutes, and then the center of the sample Until it cracks on its surface and side when it is exposed to ozone at a test temperature of 40 ° C. and an ozone concentration of 100 pphm in a state where it is fixed with a jig so that it is stretched by 20% in the length direction. Was measured.
そしてクラック発生までに要した時間が１１００時間を超えたものを耐オゾン性良好（○）、１１００時間未満であったものを耐オゾン性不良（×）と評価した。
〈引張特性〉
上記実施例１〜７、比較例１〜３で調製した被覆ゴム組成物を厚み２ｍｍのシート状に成形して１５０℃で３０分間架橋させたのち打ち抜いて日本工業規格ＪＩＳ Ｋ６２５１：２０１０「加硫ゴム及び熱可塑性ゴム−引張特性の求め方」に規定されたダンベル状３号形試験片を作製し、上記規格に所載の試験方法に則って温度２３±２℃の条件で引張試験をして引張強さＴＳ（ＭＰａ）、および切断時伸びＥｂ（％）を求めた。
And the thing which time required until crack generation | occurrence | production exceeded 1100 hours evaluated ozone resistance favorable ((circle)), and the thing which was less than 1100 hours evaluated ozone resistance defect (x).
<Tensile properties>
The coated rubber compositions prepared in Examples 1 to 7 and Comparative Examples 1 to 3 were molded into a sheet having a thickness of 2 mm, cross-linked at 150 ° C. for 30 minutes, and then punched out. Japanese Industrial Standard JIS K6251 : 2010 Dumbbell-shaped No. 3 test piece specified in “Rubber and thermoplastic rubber – Determination of tensile properties” is prepared, and a tensile test is performed at a temperature of 23 ± 2 ° C. according to the test method described in the above standard. Thus, the tensile strength TS (MPa) and the elongation at break E b (%) were determined.
そして比較例１の引張強さＴＳ、および切断時伸びＥｂを１００としたときの各実施例、比較例の引張強さＴＳ、および切断時伸びＥｂの比を求めた。引張強さＴＳの比は１３０以上を合格、切断時伸びＥｂの比は１３０以上を合格とした。
〈引裂特性〉
上記実施例１〜７、比較例１〜３で調製した被覆ゴム組成物を厚み２ｍｍのシート状に成形して１５０℃で３０分間架橋させたのち打ち抜いて日本工業規格ＪＩＳ Ｋ６２５２：２００７「加硫ゴム及び熱可塑性ゴム−引裂強さの求め方」に規定された切込みなしアングル形試験片を作製し、上記規格に所載の試験方法に則って温度２３±２℃の条件で引裂試験をして引裂強さＴＲ（Ｎ／ｍｍ）を求めた。
The respective embodiments when the tensile strength TS of Comparative Example 1, and the elongation at break E b and 100 to determine the tensile strength TS, and the ratio of the elongation at break E b of Comparative Example. The ratio of tensile strength TS passed 130 or more, and the ratio of elongation at break Eb passed 130 or more.
<Tearing properties>
The coated rubber compositions prepared in Examples 1 to 7 and Comparative Examples 1 to 3 were molded into a sheet having a thickness of 2 mm, cross-linked at 150 ° C. for 30 minutes, and then punched out. Japanese Industrial Standard JIS K6252 : 2007 Rubber and thermoplastic rubber-How to obtain the tear strength of the test piece specified in “How to determine the tear strength”, and perform the tear test under the condition of temperature 23 ± 2 ° C according to the test method described in the above standard. Thus, the tear strength T R (N / mm) was determined.
そして比較例１の引裂強さＴＲを１００としたときの各実施例、比較例の引裂強さＴＲの比を求めた。引裂強さＴＲの比は１３０以上を合格とした。
以上の結果を表１、表２に示す。
And each of the embodiments when taken as 100 tear strength T R of the Comparative Example 1 to obtain the ratio of the tear strength T R of the comparative example. The ratio of the tear T R was passed over 130.
The above results are shown in Tables 1 and 2.
表１の比較例１の結果から、従来のプレブレンド法ではジエン系ゴム相にカーボンブラックが集中し、非ジエン系ゴム相がカーボンブラックによって十分に補強されないため、耐オゾン性、引張特性、および引裂特性に優れた被覆層を形成できないことが判った。
これに対し表１、表２の実施例１〜７の結果から、相混合法を応用してジエン系ゴム相と非ジエン系ゴム相の両方にカーボンブラックを分散させることにより、当該両相を十分に補強して耐オゾン性、引張特性、および引裂特性の全てに優れた被覆層を形成できることが判った。
From the results of Comparative Example 1 in Table 1, carbon black is concentrated in the diene rubber phase and the non-diene rubber phase is not sufficiently reinforced by the carbon black in the conventional pre-blend method, so ozone resistance, tensile properties, and It was found that a coating layer having excellent tear characteristics could not be formed.
On the other hand, from the results of Examples 1 to 7 in Table 1 and Table 2, by applying the phase mixing method to disperse carbon black in both the diene rubber phase and the non-diene rubber phase, It was found that a coating layer excellent in all of ozone resistance, tensile properties, and tear properties can be formed by sufficient reinforcement.
ただし実施例１〜７、比較例２、３の結果から、上記の効果を得るためには、ジエン系ゴム相中のカーボンブラックの質量ＷＤと非ジエン系ゴム相中のカーボンブラックの質量ＷＮとの比ＷＤ／ＷＮ＝４０／６０〜６０／４０である必要があることが判った。
また特に実施例１〜３の結果から、非ジエン系ゴム相中により多くのカーボンブラックを分散させるのが、上記各特性をより一層向上する上で好ましく、そのためには質量ＷＤ、ＷＮはＷＤ＜ＷＮであるのが好ましいことが判った。
However, from the results of Examples 1 to 7 and Comparative Examples 2 and 3, in order to obtain the above effect, the mass WD of carbon black in the diene rubber phase and the mass WN of carbon black in the non-diene rubber phase It was found that the ratio of WD / WN should be 40/60 to 60/40.
In particular, from the results of Examples 1 to 3, it is preferable to disperse more carbon black in the non-diene rubber phase in order to further improve the above characteristics. For this purpose, the masses WD and WN are WD < It has been found that WN is preferred.
ただし実施例１〜３、実施例4の結果から、上記比ＷＤ／ＷＮの範囲でもＷＮが上限側に近づくほど引裂特性が低下する傾向があるため、当該比ＷＤ／ＷＮ＜５５／４５であるのが好ましいことが判った。
図１は、実施例４で調製した被覆ゴム組成物から作製した試験片を構成するジエン系ゴム相、非ジエン系ゴム相、およびカーボンブラックの分散状態を示す走査型プローブ顕微鏡写真である。
However, from the results of Examples 1 to 3 and Example 4, the ratio WD / WN <55/45 because the tearing property tends to decrease as WN approaches the upper limit side even in the range of the ratio WD / WN. It was found that this is preferable.
FIG. 1 is a scanning probe photomicrograph showing the dispersion state of a diene rubber phase, a non-diene rubber phase, and carbon black constituting a test piece prepared from the coated rubber composition prepared in Example 4.
図１から、実施例４では濃いグレーの連続したジエン系ゴム（天然ゴム）相中に、淡いグレーの非ジエン系ゴム（ＥＰＤＭ）相が不連続に分散されているとともに、両相中にそれぞれ黒色のカーボンブラックが分散されていることが確認された。
他の実施例、比較例の画像も確認したところ、比較例１では非ジエン系ゴム相中に十分な量のカーボンブラックが分散されていないことが判ったが、その他の実施例、比較例は実施例４と同様の分散状態が形成されていることが確認された。
From FIG. 1, in Example 4, the light gray non-diene rubber (EPDM) phase is discontinuously dispersed in the dark gray continuous diene rubber (natural rubber) phase, It was confirmed that black carbon black was dispersed.
When the images of other examples and comparative examples were also confirmed, it was found that a sufficient amount of carbon black was not dispersed in the non-diene rubber phase in comparative example 1, but the other examples and comparative examples were It was confirmed that the same dispersed state as in Example 4 was formed.
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| JP2019085512A (en) * | 2017-11-08 | 2019-06-06 | 住友ゴム工業株式会社 | Fender rubber composition |
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