JPH0565735B2 - - Google Patents
Info
- Publication number
- JPH0565735B2 JPH0565735B2 JP9773888A JP9773888A JPH0565735B2 JP H0565735 B2 JPH0565735 B2 JP H0565735B2 JP 9773888 A JP9773888 A JP 9773888A JP 9773888 A JP9773888 A JP 9773888A JP H0565735 B2 JPH0565735 B2 JP H0565735B2
- Authority
- JP
- Japan
- Prior art keywords
- rubber
- hydrogenated nitrile
- peroxide
- tooth
- crosslinking agent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 229920001971 elastomer Polymers 0.000 claims description 63
- 239000005060 rubber Substances 0.000 claims description 63
- 229920000459 Nitrile rubber Polymers 0.000 claims description 31
- 239000003431 cross linking reagent Substances 0.000 claims description 25
- 239000000203 mixture Substances 0.000 claims description 23
- 150000002978 peroxides Chemical class 0.000 claims description 23
- 239000007788 liquid Substances 0.000 claims description 13
- 239000005062 Polybutadiene Substances 0.000 claims description 5
- 229920002857 polybutadiene Polymers 0.000 claims description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 11
- 239000011593 sulfur Substances 0.000 description 11
- 229910052717 sulfur Inorganic materials 0.000 description 11
- 229920002589 poly(vinylethylene) polymer Polymers 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 125000000325 methylidene group Chemical group [H]C([H])=* 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 6
- 230000001070 adhesive effect Effects 0.000 description 6
- 238000004132 cross linking Methods 0.000 description 5
- 238000005984 hydrogenation reaction Methods 0.000 description 5
- 229920001084 poly(chloroprene) Polymers 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 3
- 230000032683 aging Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 229920001778 nylon Polymers 0.000 description 3
- 239000003960 organic solvent Substances 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 239000004342 Benzoyl peroxide Substances 0.000 description 2
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 239000004760 aramid Substances 0.000 description 2
- 229920003235 aromatic polyamide Polymers 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 229960003328 benzoyl peroxide Drugs 0.000 description 2
- 235000019400 benzoyl peroxide Nutrition 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- -1 for example Chemical compound 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 description 2
- 230000006798 recombination Effects 0.000 description 2
- 238000005215 recombination Methods 0.000 description 2
- GHMLBKRAJCXXBS-UHFFFAOYSA-N resorcinol Chemical compound OC1=CC=CC(O)=C1 GHMLBKRAJCXXBS-UHFFFAOYSA-N 0.000 description 2
- 238000004073 vulcanization Methods 0.000 description 2
- 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
- ODBCKCWTWALFKM-UHFFFAOYSA-N 2,5-bis(tert-butylperoxy)-2,5-dimethylhex-3-yne Chemical compound CC(C)(C)OOC(C)(C)C#CC(C)(C)OOC(C)(C)C ODBCKCWTWALFKM-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
- FRIBMENBGGCKPD-UHFFFAOYSA-N 3-(2,3-dimethoxyphenyl)prop-2-enal Chemical compound COC1=CC=CC(C=CC=O)=C1OC FRIBMENBGGCKPD-UHFFFAOYSA-N 0.000 description 1
- BUZICZZQJDLXJN-UHFFFAOYSA-N 3-azaniumyl-4-hydroxybutanoate Chemical compound OCC(N)CC(O)=O BUZICZZQJDLXJN-UHFFFAOYSA-N 0.000 description 1
- QRYFCNPYGUORTK-UHFFFAOYSA-N 4-(1,3-benzothiazol-2-yldisulfanyl)morpholine Chemical compound C1COCCN1SSC1=NC2=CC=CC=C2S1 QRYFCNPYGUORTK-UHFFFAOYSA-N 0.000 description 1
- HLBZWYXLQJQBKU-UHFFFAOYSA-N 4-(morpholin-4-yldisulfanyl)morpholine Chemical compound C1COCCN1SSN1CCOCC1 HLBZWYXLQJQBKU-UHFFFAOYSA-N 0.000 description 1
- 241001441571 Hiodontidae Species 0.000 description 1
- 239000006057 Non-nutritive feed additive Substances 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- UPIWXMRIPODGLE-UHFFFAOYSA-N butyl benzenecarboperoxoate Chemical compound CCCCOOC(=O)C1=CC=CC=C1 UPIWXMRIPODGLE-UHFFFAOYSA-N 0.000 description 1
- 230000021523 carboxylation Effects 0.000 description 1
- 238000006473 carboxylation reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 235000010299 hexamethylene tetramine Nutrition 0.000 description 1
- 239000004312 hexamethylene tetramine Substances 0.000 description 1
- 229920002681 hypalon Polymers 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert‐butyl hydroperoxide Chemical compound CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 description 1
- KUAZQDVKQLNFPE-UHFFFAOYSA-N thiram Chemical compound CN(C)C(=S)SSC(=S)N(C)C KUAZQDVKQLNFPE-UHFFFAOYSA-N 0.000 description 1
- 229960002447 thiram Drugs 0.000 description 1
- 239000004636 vulcanized rubber Substances 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
Description
産業上の利用分野
本発明は耐熱性歯付きベルトに関する。
従来の技術
従来、歯付きベルトは、多くの場合、クロロプ
レンゴムから製造されているが、例えば、自動車
分野においては、近年、エンジンの高出力化、軽
量化、小型化や、或いは部品のコンパクト化や伝
動伝達の多軸化等に伴つて、歯付きベルトが用い
られる雰囲気温度の上昇が著しく、クロロプレン
ゴムからなるベルトでは耐熱性が十分でなくな
り、かくして、従来よりも一層耐熱性にすぐれる
歯付きベルトの開発が強く要望されるに至つてい
る。
そこで、例えば、特開昭51−36247号公報や特
開昭60−121341号公報等に記載されているよう
に、近年、背ゴムや歯ゴムにクロロスルホン化ポ
リエチレンゴムを用いる歯付きベルトや、特開昭
60−172749号公報に記載されているように、水素
化ニトリルゴムの含イオウ架橋系ゴム組成物を用
いる歯付きベルト等が提案されているが、その耐
熱性は、尚、十分であるとはいい難い。
発明が解決しようとする問題点
そこで、本発明者らは、上記した問題を解決す
るために鋭意研究した結果、歯付きベルトにおい
て、背ゴム及び歯ゴム共架橋剤としての液状の末
端カルボキシル化１，２−ポリブタジエンを含有
する水素化ニトリルゴムのパーオキサイド架橋系
ゴム組成物を用いることが、歯付きベルトの耐熱
性、特に、耐熱老化性と耐熱走行寿命の一層の改
善に有効であることを見出して、本発明に至つた
ものである。
問題点を解決するための手段
本発明は、背ゴム、歯ゴム、及び歯ゴムに接着
された底帆布からなる歯付きベルトにおいて、背
ゴム及び歯ゴムが水素化ニトリルゴム100ｇ当り
にパーオーキサイド0.002〜0.03モル及び共架橋
剤としての分子量500〜5000の末端カルボキシル
化液状１，２−ポリブタジエン１〜７ｇを含有す
るパーオキサイド架橋系水素化ニトリルゴム組成
物からなることを特徴とする。
本発明において用いる水素化ニトリルゴムは、
ニトリルゴムが含有する二重結合を水素添加し
て、熱老化におけるイオウの再結合反応を起こり
難くすることによつて、イオウの再結合反応に基
づくゴム弾性の低下を防止し、かくして、ニトリ
ルゴムの利点である耐熱性を保持しつつ、耐熱性
を改善したゴムであつて、本発明においては、水
素添加率が80％以上、なかでも、水素添加率が95
％以上、特に98％以上の高水素化ニトリルゴムが
好適に用いられる。水素添加率が80％よりも少な
いときは、得られる歯付きベルトが尚、耐熱性に
劣る。
本発明においては、背ゴム及び歯ゴムとして、
パーオーキサイドの共架橋剤としての分子量500
〜5000を有する末端カルボキシル化液状ポリブタ
ジエンを含有する水素化ニトリルゴムのパーオキ
サイド架橋系ゴム組成物が用いられる。パーオキ
サイド架橋剤としては、特に、限定されるもので
はなく、例えば、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、２，５−ジメチル−２，５−ジ
（ｔ−ブチルパーオキシ）ヘキシン−３、ベンゾ
イルパーオキサイド、２，４−ジクロルジベンゾ
イルパーオキサイド、ｔ−ブチルハイドロパーオ
キサイド、クメンハイドロパーオキサイド、ｔ−
ブチルパーオキシベンゾエート、２，５−ジメチ
ル−２，５−ジ（ベンゾイルパーオキシ）ヘキサ
ン等を挙げることができる。かかるパーオキサイ
ド架橋剤は、水素化ニトリルゴム100ｇについて、
0.002〜0.03モルの範囲で配合される。
更に、本発明においては、水素化ニトリルゴム
のパーオキサイド架橋系ゴム組成物は、共架橋剤
として、分子量500〜5000の末端カルボキシル化
液状１，２−ポリブタジエンを含有し、かかる液
状１，２−ポリブタジエンは、水素化ニトリルゴ
ム100ｇについて、１〜７ｇの範囲で配合される。
特に、本発明においては、１，２−結合が70％以
上である１，２−ポリブタジエンを用いることが
好ましい。
パーオキサイド量が水素化ニトリルゴム100ｇ
に対して0.002モルよりも少ないときは、架橋反
応が十分でなく、ベルトとしては、弾性率が低い
ために、負荷寿命が悪く、実用が殆ど不可能であ
る。他方、パーオキサイド量が0.03モルよりも多
いときは、ベルトの弾性率が高すぎて、伸びが小
さく、屈曲寿命がに劣る。同様に、共架橋剤であ
る液状１，２−ポリブタジエンも、その配合量が
水素化ニトリルゴム100ｇに対して１ｇよりも少
ないときは負荷特性が悪く、７ｇよりも多いとき
は、耐熱性及び屈曲寿命に劣る。
前述したように、本発明においては、水素添加
率が80％以上、好ましくは95％以上、最も好まし
くは98％以上の高水素化ニトリルゴムが用いられ
る。このように、水素化ニトリルゴムの水素化率
が高いときは、通常は、水素化ニトリルゴムのパ
ーオキサイド系架橋剤による架橋効率が悪くな
り、その架橋のためには、大量のパーオキサイド
系架橋剤の使用を必要とし、その結果として、加
硫ゴムの屈曲性や引裂抵抗が著しく低下する。
しかしながら、本発明によれば、パーオキサイ
ド架橋系水素化ニトリルゴム組成物として、高水
素化率の水素化ニトリルゴムを用いると共に、共
架橋剤として、前記所定の液状１，２−ポリブタ
ジエンを所定量配合し、かかるゴム組成物を帆布
に加硫接着することによつて、背ゴム及び歯ゴム
が高耐熱性のみならず、高弾性率を有して、耐屈
曲性にすぐれるので、得られる歯付きベルトは、
走行寿命が著しく向上する。
歯ゴムと底帆布の接着に用いられる接着ゴム
は、水素化ニトリルゴムのパーオキサイド架橋系
ゴム組成物、含イオウ架橋系ゴム組成物のいずれ
であつてもよく、水素化ニトリルゴム、パーオキ
サイド系架橋剤又は含イオウ架橋剤、及び所謂
HRH配合を構成するための所要の添加剤からな
る。
ここに、上記パーオキサイド系架橋剤として
は、前述した架橋剤が適宜に用いられ、また、含
イオウ架橋剤としては、イオウのほか、例えば
４，4′−ジチオビスモルホリン、テトラメチルチ
ウラムジスルフイド、テトラメチルチウラムモノ
スルフイド、２−（４−モルホリノジチオ）ベン
ゾチアゾール等が用いられ、
また、HRH配合としては、通常、シリカ、メ
チレン受容体及びメチレン供与体が用いられる。
かかるメチレン受容体及びメチレン供与体として
は、従来より知られているものが任意に用いられ
るが、代表的には、例えば、メチレン受容体とし
てレゾルシノールやその誘導体、メチレン供与体
としてヘキサメチレンテトラミンやその誘導体が
用いられる。
このように、水素化ニトリルゴム、パーオキサ
イド系架橋剤又は含イオウ架橋剤、及びHRH配
合を含む接着ゴムは、これらを水素化ニトリルゴ
ムが未加硫の状態で適宜の有機溶剤に溶解させて
なる所謂糊ゴムであつて、通常、水素化ニトリル
ゴム100重量部に対して、パーオキサイド系架橋
剤0.5〜８重量部又は含イオウ架橋剤0.5〜１重量
部、シリカ１〜20重量部、メチレン受容体１〜15
重量部及びメチレン供与体１〜15重量部を含有す
る。有機溶剤としては、例えば、メチルエチルケ
トンが好ましく用いられるが、これに限定される
ものではない。
溶剤は、ゴム組成物100重量部に対して、通常、
600〜900重量部の範囲で用いられる。しかし、こ
の溶剤量も特に限定されるものではなく、得られ
る接着剤組成物の粘度が最適になるように選ばれ
る。溶剤量が余りに少ないときは、得られる糊ゴ
ムの粘度が高すぎて、作業性が悪く、一方、溶剤
量が余りに多いときは、ゴム糊の粘度が低すぎ
て、帆布を処理したときに帆布への付着量が少な
く、帆布と歯ゴムとの間に強固な接着を得ること
ができない。
更に、接着ゴムは、必要に応じて、充填剤、軟
化剤、加硫剤、加硫促進剤、加硫助剤、老化防止
剤、加工助剤等の添加剤を適宜に含有していても
よい。
また、本発明においては、帆布としては、例え
ば、ナイロン、アラミド等からなるものが用いら
れ、また、芯線としては、例えば、ガラス、ナイ
ロン、アラミド、ポリエステル等よりなるものが
用いられるが、帆布及び芯線共に、これら例示し
たものに限定されるものではない。
本発明による歯付きベルトは、従来より知られ
ている通常の方法によつて製造することができ
る。即ち、前述した接着ゴムを塗布し、乾燥させ
た帆布をベルトの歯溝形状を有する金型に巻き付
け、その上に芯線と、前述した液状１，２−ポリ
ブタジエンを共架橋剤として含有する水素化ニト
リルゴムのパーオキサイド架橋系ゴム組成物の未
加硫ゴムシートを巻き付け、圧力釜内にて加圧成
形加硫処理した後、輪切りすることによつて、歯
付きベルトを得る。
発明の効果
以上のように、本発明による歯付きベルトは、
背ゴム及び歯ゴムが液状１，２−ポリブタジエン
を共架橋剤として含有する高水素化ニトリルゴム
のパーオキサイド架橋系ゴム組成物加硫物からな
り、これが帆布に加硫接着されている。
かかる歯付きベルトは、背ゴム及び歯ゴム高弾
性率を有して、走行寿命が向上するのみならず、
底帆布と歯ゴムとが強力に接着され、且つ、その
接着が経時安定性にすぐれるので、耐熱性、特
に、耐熱老化性及び耐熱走行性にすぐれ、高温環
境下においても高寿命を有する。
実施例
以下に比較例と共に実施例を挙げて本発明を説
明するが、本発明はこれら実施例により何ら限定
されるものではない。
第１表に本実施例及び比較例にて用いる水素化
ニトリルゴムのパーオキサイド架橋系ゴム組成
物、水素化ニトリルゴムの含イオウ架橋系ゴム組
成物、及びクロロプレンゴム組成物の未加硫成分
組成を示す。また、これら未加硫ゴム及び加硫ゴ
ムの特性を第１表に示す。
これらゴム組成物を歯ゴム及び背ゴムに用い、
他方、接着ゴムをナイロン帆布に塗布、乾燥させ
た後、前記したように、この帆布をベルトの歯溝
形状を有する金型に巻き付け、その上に芯線であ
るガラス・コードと、上記背ゴム及び歯ゴムのた
めのゴム組成物からなる未加硫シートを巻き付
け、圧力釜内にて加圧成形加硫処理した後、輪切
りすることによつて、歯付きベルトを製造した。
これら歯付きベルトについて、耐熱走行試験及
び負荷耐久走行試験を行なつて、それぞれ耐熱走
行寿命及び負荷耐久寿命を調べた。結果を第２表
に示す。
耐熱走行試験は、駆動プーリーと従動プーリー
INDUSTRIAL APPLICATION FIELD The present invention relates to a heat-resistant toothed belt. Conventional technology Conventionally, toothed belts have been manufactured from chloroprene rubber in many cases, but in recent years, for example, in the automobile field, engines have become more powerful, lighter, more compact, and parts have become more compact. With the increase in the number of shafts and power transmission, the temperature of the atmosphere in which toothed belts are used has increased significantly, and belts made of chloroprene rubber no longer have sufficient heat resistance. There is a strong demand for the development of belts with belts. Therefore, as described in, for example, JP-A-51-36247 and JP-A-60-121341, toothed belts using chlorosulfonated polyethylene rubber for back rubber and tooth rubber have been developed in recent years. Tokukai Akira
As described in Publication No. 60-172749, a toothed belt using a sulfur-containing crosslinked rubber composition of hydrogenated nitrile rubber has been proposed, but its heat resistance is still not sufficient. Good and difficult. Problems to be Solved by the Invention Therefore, as a result of intensive research in order to solve the above-mentioned problems, the present inventors have found that liquid terminal carboxylation 1 is used as a back rubber and tooth rubber co-crosslinking agent in toothed belts. , 2-Polybutadiene-containing hydrogenated nitrile rubber peroxide crosslinked rubber composition is effective for further improving the heat resistance of toothed belts, particularly heat aging resistance and heat-resistant running life. This discovery led to the present invention. Means for Solving the Problems The present invention provides a toothed belt consisting of a back rubber, a tooth rubber, and a bottom canvas bonded to the tooth rubber, in which the back rubber and the tooth rubber contain peroxide per 100 g of hydrogenated nitrile rubber. It is characterized by comprising a peroxide crosslinked hydrogenated nitrile rubber composition containing 0.002 to 0.03 mol and 1 to 7 g of terminally carboxylated liquid 1,2-polybutadiene having a molecular weight of 500 to 5000 as a co-crosslinking agent. The hydrogenated nitrile rubber used in the present invention is
By hydrogenating the double bonds contained in nitrile rubber and making it difficult for the sulfur recombination reaction to occur during heat aging, a decrease in rubber elasticity due to the sulfur recombination reaction is prevented, and thus the nitrile rubber It is a rubber with improved heat resistance while maintaining the heat resistance which is the advantage of
% or more, particularly 98% or more, highly hydrogenated nitrile rubber is preferably used. When the hydrogenation rate is less than 80%, the resulting toothed belt still has poor heat resistance. In the present invention, as back rubber and tooth rubber,
Molecular weight 500 as peroxide co-crosslinking agent
A peroxide crosslinked rubber composition of hydrogenated nitrile rubber containing terminal carboxylated liquid polybutadiene having a molecular weight of 5,000 to 5,000 is used. The peroxide crosslinking agent is not particularly limited, and examples thereof include dicumyl peroxide, 2,
5-dimethyl-2,5-di(t-butylperoxy)hexane, 2,5-dimethyl-2,5-di(t-butylperoxy)hexyne-3, benzoylperoxide, 2,4-dichlorodi Benzoyl peroxide, t-butyl hydroperoxide, cumene hydroperoxide, t-
Examples include butyl peroxybenzoate, 2,5-dimethyl-2,5-di(benzoylperoxy)hexane, and the like. Such a peroxide crosslinking agent, for 100 g of hydrogenated nitrile rubber,
It is blended in a range of 0.002 to 0.03 mol. Furthermore, in the present invention, the peroxide crosslinked rubber composition of hydrogenated nitrile rubber contains terminally carboxylated liquid 1,2-polybutadiene with a molecular weight of 500 to 5000 as a co-crosslinking agent, Polybutadiene is blended in an amount of 1 to 7 g per 100 g of hydrogenated nitrile rubber.
In particular, in the present invention, it is preferable to use 1,2-polybutadiene having 70% or more of 1,2-bonds. Peroxide amount: hydrogenated nitrile rubber 100g
When the amount is less than 0.002 mol, the crosslinking reaction is insufficient and the belt has a low elastic modulus, resulting in a poor load life and is almost impossible to put into practical use. On the other hand, when the amount of peroxide is more than 0.03 mol, the elastic modulus of the belt is too high, the elongation is small, and the flex life is poor. Similarly, when the amount of liquid 1,2-polybutadiene, which is a co-crosslinking agent, is less than 1 g per 100 g of hydrogenated nitrile rubber, the load characteristics are poor, and when it is more than 7 g, the heat resistance and bending properties are poor. Inferior lifespan. As mentioned above, in the present invention, highly hydrogenated nitrile rubber with a hydrogenation rate of 80% or more, preferably 95% or more, most preferably 98% or more is used. As described above, when the hydrogenation rate of hydrogenated nitrile rubber is high, the crosslinking efficiency of the hydrogenated nitrile rubber by the peroxide crosslinking agent usually decreases, and a large amount of peroxide crosslinking is required for the crosslinking. necessitates the use of agents, resulting in a significant reduction in the flexibility and tear resistance of the vulcanized rubber. However, according to the present invention, hydrogenated nitrile rubber with a high hydrogenation rate is used as the peroxide crosslinked hydrogenated nitrile rubber composition, and a predetermined amount of the predetermined liquid 1,2-polybutadiene is used as the co-crosslinking agent. By blending and vulcanizing and adhering such a rubber composition to canvas, back rubber and tooth rubber not only have high heat resistance but also high elastic modulus and excellent bending resistance. The toothed belt is
Driving life is significantly improved. The adhesive rubber used to bond the tooth rubber and the bottom canvas may be either a peroxide crosslinked rubber composition of hydrogenated nitrile rubber or a sulfur-containing crosslinked rubber composition. Crosslinking agents or sulfur-containing crosslinking agents, and so-called
Consists of the necessary additives to make up the HRH formulation. Here, as the above-mentioned peroxide-based crosslinking agent, the above-mentioned crosslinking agent is appropriately used, and as the sulfur-containing crosslinking agent, in addition to sulfur, for example, 4,4'-dithiobismorpholine, tetramethylthiuram disulfide, etc. silica, tetramethylthiuram monosulfide, 2-(4-morpholinodithio)benzothiazole, etc. are used, and as the HRH compound, silica, a methylene acceptor, and a methylene donor are usually used.
Any conventionally known methylene acceptor and methylene donor can be used, but typically, for example, resorcinol or its derivatives are used as the methylene acceptor, and hexamethylenetetramine or its derivatives are used as the methylene donor. Derivatives are used. In this way, adhesive rubber containing hydrogenated nitrile rubber, peroxide-based crosslinking agent or sulfur-containing crosslinking agent, and HRH compound is produced by dissolving these in an appropriate organic solvent while the hydrogenated nitrile rubber is unvulcanized. It is a so-called glue rubber, and usually contains 0.5 to 8 parts by weight of a peroxide crosslinking agent or 0.5 to 1 part by weight of a sulfur-containing crosslinking agent, 1 to 20 parts by weight of silica, and methylene per 100 parts by weight of hydrogenated nitrile rubber. receptors 1-15
parts by weight and 1 to 15 parts by weight of methylene donor. As the organic solvent, for example, methyl ethyl ketone is preferably used, but the organic solvent is not limited thereto. The solvent is usually used in an amount of 100 parts by weight of the rubber composition.
It is used in a range of 600 to 900 parts by weight. However, the amount of solvent is not particularly limited, and is selected so as to optimize the viscosity of the resulting adhesive composition. If the amount of solvent is too small, the viscosity of the resulting glue rubber will be too high, resulting in poor workability.On the other hand, if the amount of solvent is too large, the viscosity of the rubber glue will be too low, and the canvas will be difficult to work with when processed. The amount of adhesion to the canvas is small, making it impossible to obtain strong adhesion between the canvas and the tooth rubber. Furthermore, the adhesive rubber may contain additives such as fillers, softeners, vulcanizing agents, vulcanization accelerators, vulcanization aids, anti-aging agents, processing aids, etc. as necessary. good. Further, in the present invention, the canvas used is made of, for example, nylon, aramid, etc., and the core wire is made of, for example, glass, nylon, aramid, polyester, etc. Both core wires are not limited to those exemplified above. The toothed belt according to the present invention can be manufactured by conventional methods known in the art. That is, a canvas coated with the above-mentioned adhesive rubber and dried is wrapped around a mold having the tooth groove shape of a belt, and then a core wire and a hydrogenation film containing the above-mentioned liquid 1,2-polybutadiene as a co-crosslinking agent are placed on top of the mold. A toothed belt is obtained by wrapping an unvulcanized rubber sheet of a nitrile rubber peroxide crosslinked rubber composition, press-molding and vulcanizing it in a pressure cooker, and cutting it into rings. Effects of the Invention As described above, the toothed belt according to the present invention has
The back rubber and the tooth rubber are made of a vulcanized product of a peroxide crosslinked rubber composition of highly hydrogenated nitrile rubber containing liquid 1,2-polybutadiene as a co-crosslinking agent, and this is vulcanized and adhered to the canvas. Such a toothed belt has high elastic modulus of back rubber and tooth rubber, and not only has a longer running life but also
Since the bottom canvas and the tooth rubber are strongly bonded and the bond has excellent stability over time, it has excellent heat resistance, especially heat aging resistance and heat running resistance, and has a long life even in high temperature environments. EXAMPLES The present invention will be explained below by giving Examples together with Comparative Examples, but the present invention is not limited by these Examples in any way. Table 1 shows the unvulcanized component compositions of peroxide crosslinked rubber compositions of hydrogenated nitrile rubber, sulfur-containing crosslinked rubber compositions of hydrogenated nitrile rubber, and chloroprene rubber compositions used in the Examples and Comparative Examples. shows. Table 1 shows the properties of these unvulcanized rubbers and vulcanized rubbers. These rubber compositions are used for tooth rubber and back rubber,
On the other hand, after applying adhesive rubber to a nylon canvas and drying it, as described above, this canvas is wrapped around a mold having the tooth groove shape of a belt, and a glass cord as a core wire, the back rubber and A toothed belt was manufactured by wrapping an unvulcanized sheet made of a rubber composition for tooth rubber, press-molding and vulcanizing it in a pressure cooker, and then cutting into rings. These toothed belts were subjected to a heat-resistant running test and a load-endurance running test to examine their heat-resistant running life and load-endurance life, respectively. The results are shown in Table 2. The heat resistance running test was conducted on the drive pulley and driven pulley.
【表】【table】
【表】【table】
【表】【table】
【表】
との間にアイドラー・プーリーを介在させて19mm
幅のベルトを巻回し、駆動プーリー回転数
3000rpm、ベルト初張力15Kgｆとし、無負荷下に
雰囲気温度140℃でベルトを走行させ、走行開始
時から背ゴム又は歯形ゴム（歯元）にクラツクが
発生するまでの時間にて評価した。
また、負荷耐久試験は、駆動プーリーと従動プ
ーリーとの間に10mm幅ベルトを巻回し、駆動プー
リー回転数6000rpm、ベルト初張力20Kgｆとし、
負荷4PSの下に雰囲気温度100℃でベルトを走行
させ、走行開始時から背ゴム又は歯形ゴム（歯
元）にクラツクが発生するまでの時間にて評価し
た。
比較例１〜４は、水素化ニトリルゴム組成物に
液状１，２−ポリブタジエンを共架橋剤として含
有させることなしに、パーオキサイド形架橋剤の
配合量を種々に変えて製造した歯付きベルトの性
能を示し、耐熱走行寿命には比較的すぐれるもの
もあるが、負荷耐久寿命が著しく劣る。
これに対して、本発明による歯付きベルトは、
耐熱走行寿命及び負荷耐久寿命共にすぐれる。
比較例５は、水素化ニトリルゴム組成物に液状
１，２−ポリブタジエンを過多に配合させた場合
であつて、得られる歯付きベルトは、耐熱性が劣
る。比較例６及び７は、末端がカルボキシル化さ
れていない液状１，２−ポリブタジエンを共架橋
剤として用いて得た歯付きベルトについての結果
を示し、本発明による歯付きベルトに比較して、
負荷耐久寿命が劣る。
比較例８〜11は、末端カルボキシル化液状１，
２−ポリブタジエン以外の共架橋剤を用いた結果
であり、耐熱走行寿命及び負荷耐久寿命いずれも
不十分である。更に、比較例８は、ムーニースコ
ーチが著しく短く、成形上、所謂焼けを起こしや
すく、、ベルトの製造には不適当である。
比較例12及び13はイオウ架橋によつて得た歯付
きベルトを、また、比較例14はクロロプレンゴム
を用いて得た歯付きベルトをそれぞれ示すが、い
ずれも性能が劣ることが明らかである。[Table] 19mm with an idler pulley interposed between
Wind the belt with the width and drive pulley rotation speed
The belt was run at 3000 rpm and an initial belt tension of 15 Kgf under no load at an ambient temperature of 140°C, and the belt was evaluated based on the time from the start of running until cracks appeared in the back rubber or toothed rubber (tooth roots). In addition, in the load durability test, a 10 mm wide belt was wound between the drive pulley and the driven pulley, the drive pulley rotation speed was 6000 rpm, and the initial belt tension was 20 Kgf.
The belt was run under a load of 4PS at an ambient temperature of 100°C, and the belt was evaluated based on the time from the start of running until cracks occurred in the back rubber or toothed rubber (tooth roots). Comparative Examples 1 to 4 are toothed belts manufactured by varying the amount of peroxide crosslinking agent without containing liquid 1,2-polybutadiene as a co-crosslinking agent in the hydrogenated nitrile rubber composition. Although some exhibit good performance and have a relatively good heat-resistant running life, their load durability life is significantly inferior. In contrast, the toothed belt according to the present invention
Excellent heat-resistant running life and load-bearing life. Comparative Example 5 is a case where an excessive amount of liquid 1,2-polybutadiene is blended into the hydrogenated nitrile rubber composition, and the resulting toothed belt has poor heat resistance. Comparative Examples 6 and 7 show results for toothed belts obtained using non-terminally carboxylated liquid 1,2-polybutadiene as a co-crosslinking agent, and compared to toothed belts according to the invention,
Poor load endurance life. Comparative Examples 8 to 11 are terminal carboxylated liquid 1,
This is the result of using a co-crosslinking agent other than 2-polybutadiene, and both the heat-resistant running life and the load-bearing life are insufficient. Furthermore, in Comparative Example 8, the Mooney scorch was extremely short and it was easy to cause so-called burning during molding, making it unsuitable for manufacturing belts. Comparative Examples 12 and 13 show toothed belts obtained by sulfur crosslinking, and Comparative Example 14 shows a toothed belt obtained using chloroprene rubber, but it is clear that both have inferior performance.
第１図は、歯付き伝動ベルトを示す断面を含む
斜視図である。
１……背ゴム、２……歯形ゴム、３……芯線、
４……帆布。
FIG. 1 is a perspective view including a cross section showing a toothed power transmission belt. 1... back rubber, 2... tooth shaped rubber, 3... core wire,
4...Canvas.
Claims (1)
帆布からなる歯付きベルトにおいて、背ゴム及び
歯ゴムが水素化ニトリルゴム100ｇ当りにパーオ
キサイド0.002〜0.03モル及び共架橋剤としての
分子量500〜5000の末端カルボキシル化液状１，
２−ポリブタジエン１〜７ｇを含有するパーオキ
サイド架橋系水素化ニトリルゴム組成物からなる
ことを特徴とする耐熱性歯付きベルト。1. In a toothed belt consisting of a back rubber, a tooth rubber, and a bottom canvas adhered to the tooth rubber, the back rubber and tooth rubber contain 0.002 to 0.03 mol of peroxide and a molecular weight of 500 as a co-crosslinking agent per 100 g of hydrogenated nitrile rubber. ~5000 terminal carboxylated liquid 1,
A heat-resistant toothed belt comprising a peroxide crosslinked hydrogenated nitrile rubber composition containing 1 to 7 g of 2-polybutadiene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9773888A JPH01269743A (en) | 1988-04-20 | 1988-04-20 | heat resistant toothed belt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9773888A JPH01269743A (en) | 1988-04-20 | 1988-04-20 | heat resistant toothed belt |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01269743A JPH01269743A (en) | 1989-10-27 |
| JPH0565735B2 true JPH0565735B2 (en) | 1993-09-20 |
Family
ID=14200238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9773888A Granted JPH01269743A (en) | 1988-04-20 | 1988-04-20 | heat resistant toothed belt |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01269743A (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3009427B2 (en) * | 1990-06-13 | 2000-02-14 | ユニッタ株式会社 | Toothed belt |
| JPH0645221B2 (en) * | 1990-11-09 | 1994-06-15 | 住友ゴム工業株式会社 | Toothed belt |
| JP2750964B2 (en) * | 1991-05-24 | 1998-05-18 | 三ツ星ベルト株式会社 | Rubber composition with good vulcanization adhesion to fiber material |
| FR2685747B1 (en) * | 1991-12-26 | 1997-09-26 | Caoutchouc Manuf Plastique | TOOTHED BELT, RESISTANT TO OIL AND HEAT BY ASSOCIATION OF ELASTOMERS. |
| JP2740452B2 (en) * | 1994-02-04 | 1998-04-15 | 株式会社椿本チエイン | Toothed belt and method of manufacturing the same |
| JP2842786B2 (en) * | 1994-03-16 | 1999-01-06 | 株式会社椿本チエイン | Toothed belt |
| JP2942459B2 (en) * | 1994-04-21 | 1999-08-30 | 株式会社椿本チエイン | Toothed belt |
| JP2824399B2 (en) * | 1994-11-22 | 1998-11-11 | 株式会社椿本チエイン | Toothed belt |
| JP2000009186A (en) * | 1998-04-20 | 2000-01-11 | Mitsuboshi Belting Ltd | Toothed belt |
-
1988
- 1988-04-20 JP JP9773888A patent/JPH01269743A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01269743A (en) | 1989-10-27 |
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