JP7617370B2 - Vulcanizate and tire using same - Google Patents
Vulcanizate and tire using same Download PDFInfo
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- JP7617370B2 JP7617370B2 JP2020166755A JP2020166755A JP7617370B2 JP 7617370 B2 JP7617370 B2 JP 7617370B2 JP 2020166755 A JP2020166755 A JP 2020166755A JP 2020166755 A JP2020166755 A JP 2020166755A JP 7617370 B2 JP7617370 B2 JP 7617370B2
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- 229920001971 elastomer Polymers 0.000 claims description 60
- 239000005060 rubber Substances 0.000 claims description 60
- 239000000203 mixture Substances 0.000 claims description 39
- 238000002156 mixing Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 6
- 244000043261 Hevea brasiliensis Species 0.000 claims description 5
- 229920003052 natural elastomer Polymers 0.000 claims description 5
- 229920001194 natural rubber Polymers 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 2
- 238000003860 storage Methods 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 description 13
- 239000002184 metal Substances 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 11
- 238000004073 vulcanization Methods 0.000 description 8
- 230000000704 physical effect Effects 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 229910052717 sulfur Inorganic materials 0.000 description 5
- 239000011593 sulfur Substances 0.000 description 5
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 239000006229 carbon black Substances 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 239000003963 antioxidant agent Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 229910017052 cobalt Inorganic materials 0.000 description 3
- 239000010941 cobalt Substances 0.000 description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 3
- 229920003244 diene elastomer Polymers 0.000 description 3
- 229920003049 isoprene rubber Polymers 0.000 description 3
- -1 organic acid cobalt salt Chemical class 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000004636 vulcanized rubber Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000005062 Polybutadiene Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000003078 antioxidant effect Effects 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- AMFIJXSMYBKJQV-UHFFFAOYSA-L cobalt(2+);octadecanoate Chemical compound [Co+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O AMFIJXSMYBKJQV-UHFFFAOYSA-L 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 229920002857 polybutadiene Polymers 0.000 description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- ZNRLMGFXSPUZNR-UHFFFAOYSA-N 2,2,4-trimethyl-1h-quinoline Chemical compound C1=CC=C2C(C)=CC(C)(C)NC2=C1 ZNRLMGFXSPUZNR-UHFFFAOYSA-N 0.000 description 1
- ZZMVLMVFYMGSMY-UHFFFAOYSA-N 4-n-(4-methylpentan-2-yl)-1-n-phenylbenzene-1,4-diamine Chemical compound C1=CC(NC(C)CC(C)C)=CC=C1NC1=CC=CC=C1 ZZMVLMVFYMGSMY-UHFFFAOYSA-N 0.000 description 1
- YJEUJARPQSLENW-UHFFFAOYSA-M B([O-])([O-])[O-].C(CCCCCC(C)(C)C)(=O)[O-].[Co+4] Chemical compound B([O-])([O-])[O-].C(CCCCCC(C)(C)C)(=O)[O-].[Co+4] YJEUJARPQSLENW-UHFFFAOYSA-M 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 125000005370 alkoxysilyl group Chemical group 0.000 description 1
- 150000001408 amides Chemical group 0.000 description 1
- 150000001412 amines Chemical group 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 238000010073 coating (rubber) Methods 0.000 description 1
- KDMCQAXHWIEEDE-UHFFFAOYSA-L cobalt(2+);7,7-dimethyloctanoate Chemical compound [Co+2].CC(C)(C)CCCCCC([O-])=O.CC(C)(C)CCCCCC([O-])=O KDMCQAXHWIEEDE-UHFFFAOYSA-L 0.000 description 1
- FJDJVBXSSLDNJB-LNTINUHCSA-N cobalt;(z)-4-hydroxypent-3-en-2-one Chemical compound [Co].C\C(O)=C\C(C)=O.C\C(O)=C\C(C)=O.C\C(O)=C\C(C)=O FJDJVBXSSLDNJB-LNTINUHCSA-N 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- GEMHFKXPOCTAIP-UHFFFAOYSA-N n,n-dimethyl-n'-phenylcarbamimidoyl chloride Chemical compound CN(C)C(Cl)=NC1=CC=CC=C1 GEMHFKXPOCTAIP-UHFFFAOYSA-N 0.000 description 1
- CMAUJSNXENPPOF-UHFFFAOYSA-N n-(1,3-benzothiazol-2-ylsulfanyl)-n-cyclohexylcyclohexanamine Chemical compound C1CCCCC1N(C1CCCCC1)SC1=NC2=CC=CC=C2S1 CMAUJSNXENPPOF-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 125000001181 organosilyl group Chemical group [SiH3]* 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 239000012763 reinforcing filler Substances 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 239000003784 tall oil Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Tires In General (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Description
本発明は、加硫物およびそれを用いたタイヤに関するものである。 The present invention relates to a vulcanizate and a tire using the same.
未加硫ゴムを含む未加硫ゴム組成物は、水分量が変化することにより加硫時間や加硫ゴムの物性が変化することが知られている。一般的に生産性向上のため、工場等でゴムを混合、押出した後、ゴムは水冷されている。そのため、未加硫ゴム組成物中の水分量がロット毎で変動し、伸びの低減や物性のばらつきが生じる。したがって、例えば特許文献１には、未加硫ゴムの水分含有率測定方法が開示され、未加硫ゴムの水分量を把握してその品質を管理している。 It is known that the vulcanization time and physical properties of vulcanized rubber change with changes in the moisture content of unvulcanized rubber compositions that contain unvulcanized rubber. In general, to improve productivity, rubber is mixed and extruded in a factory, etc., and then cooled with water. As a result, the moisture content in the unvulcanized rubber composition varies from lot to lot, resulting in reduced elongation and variations in physical properties. Therefore, for example, Patent Document 1 discloses a method for measuring the moisture content of unvulcanized rubber, and the moisture content of unvulcanized rubber is determined to control its quality.
一方、空気入りタイヤは左右一対のビード部およびサイドウォール部と、両サイドウォール部に連なるトレッド部とから主に構成されている。タイヤの内側にはカーカス層が設けられ、カーカス層の両端部はビードコアをタイヤ内側から外側へ包みこむように折り返されている。
トレッド部は、キャップトレッドとアンダートレッドとからなり、このアンダートレッドとカーカス層との間に、ベルト層が配設されている。
このベルト層には、強い衝撃や大きな荷重がかかるため、補強材としてスチールコードのような金属製補強コードが用いられている。このようなスチールコードを被覆するゴムは、スチールコードとの良好な接着性が必要とされる。
On the other hand, a pneumatic tire is mainly composed of a pair of bead portions and sidewall portions on the left and right, and a tread portion connected to both sidewall portions. A carcass layer is provided on the inside of the tire, and both ends of the carcass layer are folded back so as to enclose the bead cores from the inside to the outside of the tire.
The tread portion is composed of a cap tread and an undertread, and a belt layer is disposed between the undertread and the carcass layer.
Since the belt layer is subjected to strong impacts and large loads, a metal reinforcing cord such as a steel cord is used as a reinforcing material, and the rubber covering the steel cord is required to have good adhesion to the steel cord.
本発明の目的は、伸びを向上させ、かつ物性のばらつきを低減することができ、とくに良好な金属製補強コードとの接着性を有する加硫物およびそれを用いたタイヤを提供することにある。 The object of the present invention is to provide a vulcanizate that can improve elongation and reduce the variation in physical properties, and has particularly good adhesion to metal reinforcing cords, and a tire using the same.
本発明者は鋭意研究を重ねた結果、未加硫ゴム組成物の水分量を適切に調整することにより、前記課題を解決できることを見出し、本発明を完成することができた。 As a result of extensive research, the inventors discovered that the above problems could be solved by appropriately adjusting the water content of the unvulcanized rubber composition, and thus completed the present invention.
すなわち本発明は、未加硫ゴムを含みかつ水分量が０．２質量％未満である未加硫ゴム組成物を加硫してなる加硫物を提供するものである。 That is, the present invention provides a vulcanizate obtained by vulcanizing an unvulcanized rubber composition that contains unvulcanized rubber and has a moisture content of less than 0.2 mass%.
本発明は、未加硫ゴム組成物の水分量を０．２質量％未満としているため、ロット毎で未加硫ゴム組成物中の水分量が変動しにくく、伸びが向上する。さらに、未加硫ゴムの保管条件を一定にすることで、物性のばらつきも低減した加硫物を提供することができる。 In the present invention, the moisture content of the unvulcanized rubber composition is less than 0.2% by mass, so the moisture content in the unvulcanized rubber composition is less likely to vary from lot to lot, improving elongation. Furthermore, by keeping the storage conditions of the unvulcanized rubber constant, it is possible to provide a vulcanizate with reduced variation in physical properties.
以下、本発明をさらに詳細に説明する。 The present invention will be described in more detail below.
本発明における未加硫ゴム組成物は、未加硫ゴムを含みかつ水分量が０．２質量％未満のものである。未加硫ゴム組成物の水分量が０．２質量％以上では、加硫物の伸びを向上できない。また、加硫物の物性にばらつきが生じる。
未加硫ゴム組成物の水分量は、０．２質量％未満が好ましく、０．０５質量％以上０．２質量％未満がさらに好ましい。
なお、本発明で言う水分量とはカールフィッシャー法により測定された値を意味する。
The unvulcanized rubber composition in the present invention contains unvulcanized rubber and has a water content of less than 0.2% by mass. If the water content of the unvulcanized rubber composition is 0.2% by mass or more, the elongation of the vulcanized product cannot be improved. In addition, the physical properties of the vulcanized product vary.
The water content of the unvulcanized rubber composition is preferably less than 0.2% by mass, and more preferably from 0.05% by mass to less than 0.2% by mass.
The water content in the present invention means a value measured by the Karl Fischer method.
本発明における未加硫ゴム組成物の水分量の調整方法としてはとくに制限されないが、例えば、相対湿度３０％未満で１２時間以上保管し、前記未加硫ゴム組成物の水分量を０．２質量％未満に調整する調整工程を行うことが挙げられる。この調整工程における雰囲気温度は、例えば１０～４０℃が好ましい。
また、前記調整工程の前に、前記未加硫ゴム組成物を１００℃以上で混合する混合工程および／または前記未加硫ゴム組成物を押出成形する成形工程を実施することにより、未加硫ゴム組成物の水分量を０．２質量％未満あるいはそれ以下に容易に調整することができる。なお、前記混合工程後または成形工程後に前記未加硫ゴムを冷却する場合には、未加硫ゴムの水分吸収を避けるために、例えばファン等を用いた空冷を行うことが好ましい。
The method for adjusting the moisture content of the unvulcanized rubber composition in the present invention is not particularly limited, but for example, a step of adjusting the moisture content of the unvulcanized rubber composition to less than 0.2 mass % by storing the composition at a relative humidity of less than 30% for 12 hours or more can be mentioned. The atmospheric temperature in this adjustment step is preferably, for example, 10 to 40° C.
Furthermore, by carrying out a mixing step of mixing the unvulcanized rubber composition at 100° C. or higher and/or a molding step of extruding the unvulcanized rubber composition prior to the adjusting step, the moisture content of the unvulcanized rubber composition can be easily adjusted to less than 0.2% by mass or less. When cooling the unvulcanized rubber after the mixing step or molding step, it is preferable to carry out air cooling using, for example, a fan in order to prevent the unvulcanized rubber from absorbing moisture.
次に、本発明における未加硫ゴム組成物に配合し得る各成分について説明する。本発明における未加硫ゴム組成物は、少なくとも未加硫ゴムを含む。 Next, each component that can be blended into the unvulcanized rubber composition of the present invention will be described. The unvulcanized rubber composition of the present invention contains at least unvulcanized rubber.
（未加硫ゴム）
本発明で使用される未加硫ゴムとしては、例えばジエン系ゴムが挙げられ、ジエン系ゴムとしては、天然ゴム（ＮＲ）、合成イソプレンゴム（ＩＲ）、ブタジエンゴム（ＢＲ）、スチレン－ブタジエン共重合体ゴム（ＳＢＲ）、アクリロニトリル－ブタジエン共重合体ゴム（ＮＢＲ）等が挙げられる。なお、本発明の加硫物を金属接着用加硫物として用いる場合には、ＮＲおよび／またはＩＲの配合量を、ジエン系ゴム全体を１００質量部としたときに８０質量部以上に設定することが好ましい。なお、未加硫ゴムの分子量やミクロ構造はとくに制限されず、アミン、アミド、シリル、アルコキシシリル、カルボキシル、ヒドロキシル基等で末端変性されていても、エポキシ化されていてもよい。
(Unvulcanized rubber)
The unvulcanized rubber used in the present invention may be, for example, a diene rubber, and examples of the diene rubber include natural rubber (NR), synthetic isoprene rubber (IR), butadiene rubber (BR), styrene-butadiene copolymer rubber (SBR), and acrylonitrile-butadiene copolymer rubber (NBR). When the vulcanizate of the present invention is used as a vulcanizate for metal bonding, it is preferable to set the amount of NR and/or IR to 80 parts by mass or more when the total diene rubber is 100 parts by mass. The molecular weight and microstructure of the unvulcanized rubber are not particularly limited, and the rubber may be terminally modified with amine, amide, silyl, alkoxysilyl, carboxyl, hydroxyl, or the like, or may be epoxidized.
（その他成分）
また本発明の加硫物を金属接着用加硫物として用いる場合、未加硫ゴム組成物（以下、金属接着用ゴム組成物と言うことがある）には、有機酸コバルト塩を配合することにより、金属部材との接着性をさらに高めることができる。
有機酸コバルト塩としては、例えばナフテン酸コバルト、ネオデカン酸コバルト、ステアリン酸コバルト、ロジン酸コバルト、バーサチック酸コバルト、トール油酸コバルト、ホウ酸ネオデカン酸コバルト、アセチルアセトナートコバルト等を例示することができる。
有機酸コバルト塩の配合割合は、前記未加硫ゴム１００質量部に対し、０．１～５質量部であるのが好ましく、０．５～３質量部であるのがさらに好ましい。
(Other ingredients)
Furthermore, when the vulcanizate of the present invention is used as a vulcanizate for metal bonding, the adhesion to metal members can be further enhanced by blending an organic acid cobalt salt into the unvulcanized rubber composition (hereinafter sometimes referred to as a rubber composition for metal bonding).
Examples of the organic acid cobalt salts include cobalt naphthenate, cobalt neodecanoate, cobalt stearate, cobalt rosinate, cobalt versatate, cobalt tall oil acid, cobalt borate neodecanoate, and cobalt acetylacetonate.
The mixing ratio of the organic acid cobalt salt is preferably 0.1 to 5 parts by mass, and more preferably 0.5 to 3 parts by mass, based on 100 parts by mass of the unvulcanized rubber.
本発明における金属接着用ゴム組成物は、補強性充填剤を配合することができる。その例としては、カーボンブラック、シリカ、クレー、マイカ、タルク、炭酸カルシウム、酸化アルミニウム、酸化チタン等が挙げられる。 The rubber composition for metal bonding in the present invention can be compounded with a reinforcing filler. Examples include carbon black, silica, clay, mica, talc, calcium carbonate, aluminum oxide, titanium oxide, etc.
なお、本発明における金属接着用ゴム組成物にカーボンブラックを配合する場合は、前記未加硫ゴム１００質量部に対し、４０質量部超８０質量部以下であるのが好ましく、５０～７０質量部であるのがさらに好ましい。
前記カーボンブラックの配合量を４０質量部超とすることにより、伸びや破断物性の点で有利となり、８０質量部以下とすることにより、低発熱性の点で有利となる。
When carbon black is blended into the rubber composition for metal bonding in the present invention, the amount is preferably more than 40 parts by mass and not more than 80 parts by mass, and more preferably 50 to 70 parts by mass, per 100 parts by mass of the unvulcanized rubber.
When the blending amount of the carbon black is more than 40 parts by mass, it is advantageous in terms of elongation and breaking properties, and when it is 80 parts by mass or less, it is advantageous in terms of low heat build-up.
本発明の未加硫ゴム組成物または金属接着用ゴム組成物には、前記した成分に加えて、加硫剤、加硫促進剤、各種充填剤、各種オイル、酸化防止剤、老化防止剤、可塑剤などのゴム組成物に一般的に配合されている各種添加剤を配合することができ、かかる添加剤は一般的な方法で混練して組成物とし、加硫するのに使用することができる。これらの添加剤の配合量も、本発明の目的に反しない限り、従来の一般的な配合量とすることができる。 In addition to the above-mentioned components, the unvulcanized rubber composition or the rubber composition for metal bonding of the present invention can be blended with various additives that are generally blended in rubber compositions, such as vulcanizing agents, vulcanization accelerators, various fillers, various oils, antioxidants, antiaging agents, and plasticizers, and such additives can be kneaded in a general manner to form a composition and used for vulcanization. The blending amounts of these additives can be conventional general blending amounts as long as they do not contradict the object of the present invention.
なお、加硫剤として硫黄を使用する場合、金属製補強コードとの接着性をさらに高めるという観点から、その配合量は、未加硫ゴム１００質量部に対し、４質量部以上１０質量部未満であるのが好ましく、５～８質量部であるのがさらに好ましい。 When sulfur is used as a vulcanizing agent, from the viewpoint of further enhancing adhesion to the metal reinforcing cord, the amount of sulfur blended is preferably 4 parts by mass or more and less than 10 parts by mass, and more preferably 5 to 8 parts by mass, per 100 parts by mass of unvulcanized rubber.
一方、本発明における金属接着用ゴム組成物は、金属製補強コードとの接着性が良好であり、例えば、アンダートレッドに埋設されるベルト（スチールコード）を被覆するゴムとして好適に使用することができる。また、スチールコードは、ブラスメッキされているのが好ましい。 On the other hand, the rubber composition for bonding metal in the present invention has good adhesion to metal reinforcing cords and can be suitably used, for example, as a rubber coating for belts (steel cords) embedded in the undertread. In addition, it is preferable that the steel cords are brass-plated.
また本発明の未加硫ゴム組成物または金属接着用ゴム組成物の加硫条件についてはとくに制限されず、用途に応じて適宜決定することができる。なお、物性のばらつきをさらに低減するという観点から、加硫温度は１６０～１９０℃が好ましく、１７０～１８０℃がさらに好ましい。また、本発明の加硫物をタイヤに用いる場合には、従来のタイヤの製造方法に従うことができる。また本発明のタイヤは、空気入りタイヤであることが好ましく、空気、窒素等の不活性ガス及びその他の気体を充填することができる。 The vulcanization conditions for the unvulcanized rubber composition or the rubber composition for metal bonding of the present invention are not particularly limited and can be appropriately determined depending on the application. From the viewpoint of further reducing the variation in physical properties, the vulcanization temperature is preferably 160 to 190°C, and more preferably 170 to 180°C. When the vulcanizate of the present invention is used for a tire, conventional tire manufacturing methods can be followed. The tire of the present invention is preferably a pneumatic tire, and can be filled with air, an inert gas such as nitrogen, or other gases.
以下、本発明を実施例および比較例によりさらに説明するが、本発明は下記例に制限されるものではない。 The present invention will be further explained below with reference to examples and comparative examples, but the present invention is not limited to the following examples.
実施例１～８および比較例１～４
サンプルの調製
表１および２に示す配合（質量部）において、加硫促進剤と硫黄を除く成分を１．７リットルの密閉式バンバリーミキサーで５分間混練し、ゴムをミキサー外に放出して室温冷却した。次いで、該ゴムを同ミキサーに再度入れ、加硫促進剤および硫黄を加えてさらに混練し、未加硫ゴム組成物を得た。この未加硫ゴム組成物を、表１および２に示す条件で保管した後、カールフィッシャー法により未加硫ゴム組成物の水分量を調べた。続いて、未加硫ゴム組成物を所定の金型中で表１および２に示す条件でプレス加硫して加硫ゴム試験片を得、以下に示す試験法で加硫ゴム試験片の物性を測定した。
Examples 1 to 8 and Comparative Examples 1 to 4
Preparation of Samples In the formulation (parts by mass) shown in Tables 1 and 2, the components other than the vulcanization accelerator and sulfur were kneaded in a 1.7-liter closed Banbury mixer for 5 minutes, and the rubber was discharged outside the mixer and cooled at room temperature. The rubber was then put back into the mixer, and the vulcanization accelerator and sulfur were added and further kneaded to obtain an unvulcanized rubber composition. This unvulcanized rubber composition was stored under the conditions shown in Tables 1 and 2, and the moisture content of the unvulcanized rubber composition was examined by the Karl Fischer method. Next, the unvulcanized rubber composition was press-vulcanized in a specified mold under the conditions shown in Tables 1 and 2 to obtain vulcanized rubber test pieces, and the physical properties of the vulcanized rubber test pieces were measured by the test methods shown below.
破断伸び（ＥＢ）：ＪＩＳ Ｋ６２５１に準拠して引張試験にて１００℃で評価した。結果は比較例２または４の値を１００として指数表示した。指数が大きいほど破断伸びに優れることを示す。
ベルト剥離力：ＪＩＳ Ｋ６２５６に準拠して、各サンプルを剥離し、剥離力を評価した。結果は比較例２または４の値を１００として指数表示した。指数が大きいほどベルト剥離力に優れることを示す。
結果を表１および２に併せて示す。
Breaking elongation (EB): Evaluated at 100° C. in a tensile test in accordance with JIS K6251. The results are expressed as an index, with the value of Comparative Example 2 or 4 being 100. A larger index indicates better breaking elongation.
Belt peeling force: Each sample was peeled off and the peeling force was evaluated according to JIS K6256. The results were expressed as an index, with the value of Comparative Example 2 or 4 being 100. A larger index indicates better belt peeling force.
The results are shown in Tables 1 and 2.
＊１：ＮＲ（ＲＳＳ＃３）
＊２：カーボンブラック（東海カーボン（株）製シースト３００）
＊３：酸化亜鉛（正同化学工業（株）製酸化亜鉛３種）
＊４：ステアリン酸コバルト（ＤＩＣ（株）製）
＊５：老化防止剤６ＰＰＤ（フレキシス製サントフレックス６ＰＰＤ）
＊６：老化防止剤ＲＤ（大内新興化学工業（株）製ノクラック２２４）
＊７：加硫促進剤ＤＣＢＳ（大内新興化学工業（株）製ノクセラーＤＺ）
＊８：硫黄（アクゾノーベル（株）製クリステックスＨＳ ＯＴ ２０）
*1:NR (RSS#3)
*2: Carbon black (Tokai Carbon Co., Ltd., Seast 300)
*3: Zinc oxide (Zinc oxide type 3 manufactured by Seido Chemical Industry Co., Ltd.)
*4: Cobalt stearate (DIC Corporation)
*5: Antioxidant 6PPD (Flexis Santoflex 6PPD)
*6: Antioxidant RD (Nocrac 224 manufactured by Ouchi Shinko Chemical Industry Co., Ltd.)
*7: Vulcanization accelerator DCBS (Noccela DZ manufactured by Ouchi Shinko Chemical Industry Co., Ltd.)
*8: Sulfur (Crystex HS OT 20 manufactured by Akzo Nobel Co., Ltd.)
上記の表１、２から明らかなように、各実施例における未加硫ゴム組成物は、未加硫ゴムを含みかつ水分量が０．２質量％未満のものであり、比較例２または４に比べて破断伸びおよびベルト剥離力に優れる。
これに対し、比較例１、３は、未加硫ゴム組成物の水分量が０．２質量％以上であるので、比較例２または４に比べて、破断伸びおよびベルト剥離力に改善が見られなかった。
なお、実施例１～４および比較例１は比較例２の結果と対比され、実施例５～８および比較例３は比較例４の結果と対比される。
As is clear from Tables 1 and 2 above, the unvulcanized rubber composition in each Example contains unvulcanized rubber and has a moisture content of less than 0.2 mass%, and is superior in breaking elongation and belt peeling force compared to Comparative Examples 2 and 4.
In contrast, in Comparative Examples 1 and 3, since the water content of the unvulcanized rubber composition was 0.2 mass % or more, no improvement was observed in the breaking elongation and belt peeling force compared to Comparative Examples 2 and 4.
Examples 1 to 4 and Comparative Example 1 are contrasted with the results of Comparative Example 2, and Examples 5 to 8 and Comparative Example 3 are contrasted with the results of Comparative Example 4.
Claims (1)
前記調整工程の前に、前記未加硫ゴム組成物を１００℃以上で混合する混合工程および／または前記未加硫ゴム組成物を押出成形する成形工程を実施する
ことを特徴とする保管方法。 The method includes a step of storing an unvulcanized rubber composition containing an unvulcanized rubber having a ratio of 100% by mass of natural rubber at a relative humidity of less than 30% for 12 hours or more to adjust the moisture content of the unvulcanized rubber composition to less than 0.2% by mass,
Prior to the preparation step, a mixing step of mixing the unvulcanized rubber composition at 100° C. or higher and/or a molding step of extruding the unvulcanized rubber composition are carried out.
A storage method comprising the steps of:
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013023518A (en) | 2011-07-19 | 2013-02-04 | Fujikura Ltd | Chloroprene rubber composition and cable |
| JP2017122201A (en) | 2016-01-08 | 2017-07-13 | 日立金属株式会社 | Chloroprene rubber composition containing silane coupling agent and method for producing the same; method for producing cable and electric wire and chloroprene rubber composition for silane coupling |
| WO2018151148A1 (en) | 2017-02-15 | 2018-08-23 | 横浜ゴム株式会社 | Rubber composition |
| JP2018131523A (en) | 2017-02-15 | 2018-08-23 | 横浜ゴム株式会社 | Rubber composition |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013023518A (en) | 2011-07-19 | 2013-02-04 | Fujikura Ltd | Chloroprene rubber composition and cable |
| JP2017122201A (en) | 2016-01-08 | 2017-07-13 | 日立金属株式会社 | Chloroprene rubber composition containing silane coupling agent and method for producing the same; method for producing cable and electric wire and chloroprene rubber composition for silane coupling |
| WO2018151148A1 (en) | 2017-02-15 | 2018-08-23 | 横浜ゴム株式会社 | Rubber composition |
| JP2018131523A (en) | 2017-02-15 | 2018-08-23 | 横浜ゴム株式会社 | Rubber composition |
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