JPH0816504B2 - Polyurethane transmission belt and polyurethane composition for transmission belt - Google Patents
Polyurethane transmission belt and polyurethane composition for transmission beltInfo
- Publication number
- JPH0816504B2 JPH0816504B2 JP35088992A JP35088992A JPH0816504B2 JP H0816504 B2 JPH0816504 B2 JP H0816504B2 JP 35088992 A JP35088992 A JP 35088992A JP 35088992 A JP35088992 A JP 35088992A JP H0816504 B2 JPH0816504 B2 JP H0816504B2
- Authority
- JP
- Japan
- Prior art keywords
- polyurethane
- weight
- parts
- stabilizer
- transmission belt
- 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
- 229920002635 polyurethane Polymers 0.000 title claims description 60
- 239000004814 polyurethane Substances 0.000 title claims description 60
- 230000005540 biological transmission Effects 0.000 title claims description 27
- 239000000203 mixture Substances 0.000 title claims description 21
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 claims description 24
- 239000012964 benzotriazole Substances 0.000 claims description 24
- 239000003381 stabilizer Substances 0.000 claims description 24
- 239000003963 antioxidant agent Substances 0.000 claims description 23
- 230000003078 antioxidant effect Effects 0.000 claims description 22
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 21
- 150000001412 amines Chemical class 0.000 claims description 21
- 239000012963 UV stabilizer Substances 0.000 claims description 14
- 239000006097 ultraviolet radiation absorber Substances 0.000 claims description 14
- 239000006096 absorbing agent Substances 0.000 claims description 11
- 239000000326 ultraviolet stabilizing agent Substances 0.000 claims description 9
- 239000002530 phenolic antioxidant Substances 0.000 claims description 3
- 238000002845 discoloration Methods 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 11
- 230000000704 physical effect Effects 0.000 description 7
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 6
- 229920001971 elastomer Polymers 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000004611 light stabiliser Substances 0.000 description 3
- 230000002195 synergetic effect Effects 0.000 description 2
- QSRJVOOOWGXUDY-UHFFFAOYSA-N 2-[2-[2-[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propanoyloxy]ethoxy]ethoxy]ethyl 3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C)=CC(CCC(=O)OCCOCCOCCOC(=O)CCC=2C=C(C(O)=C(C)C=2)C(C)(C)C)=C1 QSRJVOOOWGXUDY-UHFFFAOYSA-N 0.000 description 1
- -1 2H-benzotriazol-2-yl Chemical group 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- WNLRTRBMVRJNCN-UHFFFAOYSA-L adipate(2-) Chemical compound [O-]C(=O)CCCCC([O-])=O WNLRTRBMVRJNCN-UHFFFAOYSA-L 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- RSOILICUEWXSLA-UHFFFAOYSA-N bis(1,2,2,6,6-pentamethylpiperidin-4-yl) decanedioate Chemical compound C1C(C)(C)N(C)C(C)(C)CC1OC(=O)CCCCCCCCC(=O)OC1CC(C)(C)N(C)C(C)(C)C1 RSOILICUEWXSLA-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明はポリウレタン製のベルト
及び伝動ベルト用ポリウレタン組成物に係わり、詳しく
はポリウレタンの耐光性を改善するものに係わる。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyurethane belt and a polyurethane composition for a transmission belt, and more particularly to a polyurethane composition having improved light resistance.
【０００２】[0002]
【従来の技術】従来より伝動ベルトの素材としては、ゴ
ムやポリウレタンが使用されてきた、ゴムは外観性に劣
るとともに、ベルトとして走行させているときにゴムの
屑が落ちてしまうという汚れの問題があった。それに対
してポリウレタン製のベルトはゴムに比べて外観性に優
れ、ゴムベルトのときのゴム落ちのような周囲に摩耗屑
を落としてしまうという欠点がないという理由で、その
使用は広範囲に渡っている。2. Description of the Related Art Conventionally, rubber or polyurethane has been used as a material for a transmission belt. The rubber has a poor appearance, and the dirt of rubber is removed when the belt is run. was there. Polyurethane belts, on the other hand, have a wide range of uses because they are superior in appearance to rubber and do not have the drawback of dropping wear debris to the surrounding area, such as rubber dropping when a rubber belt is used. .
【０００３】[0003]
【発明が解決しようとする課題】ところが、ポリウレタ
ンの欠点として紫外線による変色が挙げられる。ポリウ
レタンは紫外線に長期に渡ってさらされると変色してし
まい、外観的な質が落ちてしまう。そのためにポリウレ
タン製の伝動ベルトは、屋外は勿論屋内において保管し
た場合も、窓からの採光および蛍光灯などの照明中の紫
外線によって変色してしまい、使用しているあいだに変
色してしまうということがあったり、ベルトとして製造
したあとに長期間保管することができないという問題が
あった。そこで、ポリウレタンにベンゾトリアゾール系
の紫外線吸収剤とヒンダードフェノール系の酸化防止剤
を添加することにより耐光性を向上させたウレタンベル
トが提案されていた。However, a drawback of polyurethane is discoloration due to ultraviolet rays. Polyurethane discolors when exposed to UV light for a long period of time, which deteriorates its appearance. For that reason, the transmission belt made of polyurethane is discolored during use while it is stored indoors as well as outdoors, due to ultraviolet rays during daylighting from windows and lighting such as fluorescent lamps. However, there is a problem that it cannot be stored for a long time after being manufactured as a belt. Therefore, there has been proposed a urethane belt having improved light resistance by adding a benzotriazole-based ultraviolet absorber and a hindered phenol-based antioxidant to polyurethane.
【０００４】ベンゾトリアゾール系の紫外線吸収剤とヒ
ンダードフェノール系の酸化防止剤を添加したポリウレ
タンを用いた伝動ベルトは紫外線にさらされたときの変
色が若干少なくなったものの、まだ充分といえるもので
はなく、更なる改良が望まれていた。そこで本発明の目
的とするところはポリウレタン製の伝動ベルトにおい
て、紫外線にさらされた状況下において使用または保管
しても変色が極めて少なく抑えられ、外観的に経時変化
の少ないポリウレタン製伝動ベルト及び伝動ベルト用ポ
リウレタン組成物を提供するところにある。A transmission belt using polyurethane to which a benzotriazole type ultraviolet absorber and a hindered phenol type antioxidant are added has little discoloration when exposed to ultraviolet rays, but is still not enough. However, further improvement was desired. Therefore, an object of the present invention is to provide a polyurethane transmission belt, which has extremely little discoloration even when used or stored under a condition of being exposed to ultraviolet rays, and which has a small appearance change with time. There is provided a polyurethane composition for a belt.
【０００５】[0005]
【課題を解決するための手段】本発明は、このような目
的を達成するためにポリウレタン弾性体からなる伝動ベ
ルトにおいて、ポリウレタン弾性体にはベンゾトリアゾ
ール系に紫外線吸収剤とヒンダードアミン系紫外線安定
剤およびヒンダードフェノール系の酸化防止剤をブレン
ドした耐光安定剤を添加した組成物を用いたことを特徴
とする。また、ポリウレタン１００重量部に対して耐光
安定剤の添加量が０．２〜４．０重量部であること、ま
た、ポリウレタン１００重量部に対して耐光安定剤を構
成するベンゾトリアゾール系の紫外線吸収剤が０．０８
〜１．６重量部、ヒンダードアミン系の紫外線安定剤が
０．０８〜１．６重量部、ヒンダードフェノール系の酸
化防止剤が０．０４〜０．８重量部であることが、後か
ら述べる理由により有利である。In order to achieve such an object, the present invention provides a transmission belt comprising a polyurethane elastic body, wherein the polyurethane elastic body comprises a benzotriazole type ultraviolet absorber and a hindered amine type ultraviolet stabilizer. It is characterized in that a composition containing a light resistance stabilizer blended with a hindered phenolic antioxidant is used. Further, the addition amount of the light resistance stabilizer is 0.2 to 4.0 parts by weight with respect to 100 parts by weight of polyurethane, and the ultraviolet absorption of the benzotriazole type which constitutes the light resistance stabilizer with respect to 100 parts by weight of polyurethane. Agent is 0.08
~ 1.6 parts by weight, 0.08 to 1.6 parts by weight of the hindered amine-based UV stabilizer, and 0.04 to 0.8 parts by weight of the hindered phenol-based antioxidant will be described later. Advantageous for reasons.
【０００６】また、伝動ベルト用ポリウレタン組成物に
おいて、ポリウレタンにベンゾトリアゾール系に紫外線
吸収剤とヒンダードアミン系紫外線安定剤およびヒンダ
ードフェノール系の酸化防止剤をブレンドした耐光安定
剤を添加したことを特徴とする。また、ポリウレタン１
００重量部に対して耐光安定剤の添加量が０．２〜４．
０重量部であること、また、ポリウレタン１００重量部
に対して耐光安定剤を構成するベンゾトリアゾール系の
紫外線吸収剤が０．０８〜１．６重量部、ヒンダードア
ミン系の紫外線安定剤が０．０８〜１．６重量部、ヒン
ダードフェノール系の酸化防止剤が０．０４〜０．８重
量部であることが、後から述べる理由により有利であ
る。Further, in a polyurethane composition for a power transmission belt, a light resistance stabilizer obtained by blending a polyurethane with a benzotriazole type ultraviolet absorber, a hindered amine type ultraviolet stabilizer and a hindered phenol type antioxidant is added. To do. Also, polyurethane 1
The amount of the light fastness stabilizer added is 0.2 to 4.
0 parts by weight, 0.08 to 1.6 parts by weight of a benzotriazole-based UV absorber constituting a light resistance stabilizer, and 0.08 parts by weight of a hindered amine-based UV stabilizer with respect to 100 parts by weight of polyurethane. It is advantageous that the amount of the hindered phenol-based antioxidant is 0.04 to 0.8 parts by weight, and the amount of the hindered phenol antioxidant is 0.04 to 0.8 parts by weight.
【０００７】本発明の伝動ベルト１は、図１に示すよう
なたとえば心線２として芳香族ポリアミドなどの低伸度
高強力の繊維からなるロープをベルト長手方向にスパイ
ラル状に埋設したポリウレタン弾性体３からなる伝動ベ
ルト１であり、伝動面にベルト長手方向所定ピッチで歯
部４と溝部５を交互に有する歯付ベルトやベルト長手方
向に複数本のリブを有するリブドベルト等、ベルトの種
類は限定されるものではなく何でもよい。ベルト本体を
構成するポリウレタンはイソシアネートとして、ＴＤＩ
およびＭＤＩなどが、ポリオールとしてはＰＴＧ、アジ
ペート系などで構成されている。The transmission belt 1 of the present invention is a polyurethane elastic body in which a rope made of fibers having low elongation and high strength such as aromatic polyamide is embedded as a core wire 2 in a spiral shape in the belt longitudinal direction as shown in FIG. 3 is a transmission belt 1, and the type of the belt is limited, such as a toothed belt having tooth portions 4 and groove portions 5 alternately on the transmission surface at a predetermined pitch in the belt longitudinal direction or a ribbed belt having a plurality of ribs in the belt longitudinal direction. It doesn't matter what is done. Polyurethane that composes the belt body is TDI as isocyanate.
In addition, MDI and the like are composed of PTG, adipate-based and the like as the polyol.
【０００８】また、このポリウレタンは耐光安定性を改
善した組成物であり、耐光安定剤がポリウレタン１００
重量部に対して０．２〜４．０重量部の割合で添加され
ている。そして、耐光安定剤の添加量が０．２重量部未
満であると変色防止の効果が見られず、４．０重量部を
越えるとウレタンの物性が低下するので好ましくない。Further, this polyurethane is a composition having improved light resistance stability, and the light resistance stabilizer is polyurethane 100.
It is added in a proportion of 0.2 to 4.0 parts by weight with respect to parts by weight. If the amount of the light fastness stabilizer added is less than 0.2 parts by weight, the effect of preventing discoloration is not observed, and if it exceeds 4.0 parts by weight, the physical properties of urethane are deteriorated, which is not preferable.
【０００９】本発明で使用される耐光安定剤は、ベンゾ
トリアゾール系の紫外線吸収剤とヒンダードアミン系の
紫外線安定剤および、ヒンダードフェノール系の酸化防
止剤の三つの成分からなり、ベンゾトリアゾール系の紫
外線吸収剤としては例えばメチル−３−〔３−ｔ−ブチ
ル−５−（２Ｈ−ベンゾトリアゾール−２−イル）−４
−ヒドロキシフェニル〕プロピオネートとポリエチレン
グリコールとの縮合物が挙げられる。またヒンダードア
ミン系の紫外線安定剤としては例えばビス（１、２、
２、６、６−ペンタメチル−４−ピペリジル）セバケー
トが挙げられる。更にヒンダードフェノール系の酸化防
止剤としては例えばトリエチレングリコール−ビス〔３
−（３−ｔ−ブチル−５−メチル−４−ヒドロキシフェ
ニル）プロピオネート〕が挙げられる。The light-resistant stabilizer used in the present invention comprises three components, a benzotriazole-based UV absorber, a hindered amine-based UV stabilizer, and a hindered phenol-based antioxidant. Examples of the absorbent include methyl-3- [3-t-butyl-5- (2H-benzotriazol-2-yl) -4.
A condensate of -hydroxyphenyl] propionate and polyethylene glycol may be mentioned. Examples of hindered amine-based UV stabilizers include bis (1,2,
2,6,6-pentamethyl-4-piperidyl) sebacate. Further, examples of hindered phenol-based antioxidants include triethylene glycol-bis [3
-(3-t-butyl-5-methyl-4-hydroxyphenyl) propionate].
【００１０】また、三つの成分の夫々の添加量はポリウ
レタン１００重量部に対してベンゾトリアゾール系に紫
外線吸収剤が０．０８〜１．６重量部であり、ヒンダー
ドアミン系の紫外線安定剤が０．０８〜１．６重量部で
あり、ヒンダードフェノール系の酸化防止剤が０．０４
〜０．８重量部の範囲内であることが好ましい。これら
の添加量のうちベンゾトリアゾール系の紫外線吸収剤の
添加量が０．０８重量部未満であると変色に対する効果
がなくなり、１．６重量部を越えるとウレタンの物性が
低下する。The addition amount of each of the three components is 0.08 to 1.6 parts by weight of a benzotriazole type ultraviolet absorber to 100 parts by weight of polyurethane, and 0.1% by weight of a hindered amine type ultraviolet stabilizer. 08 to 1.6 parts by weight, and the hindered phenol-based antioxidant is 0.04
It is preferably in the range of 0.8 parts by weight. If the amount of the benzotriazole-based ultraviolet absorber added is less than 0.08 parts by weight, the effect on discoloration is lost, and if it exceeds 1.6 parts by weight, the physical properties of urethane deteriorate.
【００１１】またヒンダードアミン系の紫外線安定剤の
添加量が０．０８重量部未満であると変色に対する効果
がなくなり、１．６重量部を越えるとウレタンの物性が
低下するので好ましくない。更にヒンダードフェノール
系の酸化防止剤の添加量が０．０４重量部未満であると
日光暴露後、ウレタンの物性の維持ができないという問
題があり、０．８重量部を越えるとやはりウレタンの物
性が低下するので好ましくない。If the amount of the hindered amine-based UV stabilizer added is less than 0.08 parts by weight, the effect on discoloration is lost, and if it exceeds 1.6 parts by weight, the physical properties of the urethane deteriorate, which is not preferable. Further, if the amount of the hindered phenolic antioxidant added is less than 0.04 parts by weight, there is a problem that the physical properties of the urethane cannot be maintained after exposure to sunlight, and if it exceeds 0.8 parts by weight, the physical properties of the urethane still remain. Is reduced, which is not preferable.
【００１２】[0012]
【作用】ポリウレタンからなる伝動ベルトまたは伝動ベ
ルト用ポリウレタン組成物の紫外線による変色を抑える
耐光安定剤としてベンゾトリアゾール系の紫外線吸収剤
とヒンダードアミン系の紫外線安定剤とヒンダードフェ
ノール系の酸化防止剤からなる耐光安定剤を使用する
と、紫外線吸収剤と紫外線安定剤の相乗効果が大きく、
紫外線による変色を大きく抑えることができ、ベルトの
外観の経時変化を極力少なくすることができる。[Function] As a light resistance stabilizer for suppressing discoloration of a transmission belt made of polyurethane or a polyurethane composition for a transmission belt by ultraviolet rays, it comprises a benzotriazole type ultraviolet absorber, a hindered amine type ultraviolet stabilizer and a hindered phenol type antioxidant. Use of a light resistance stabilizer has a large synergistic effect between the ultraviolet absorber and the ultraviolet stabilizer,
The discoloration due to ultraviolet rays can be greatly suppressed, and the change in the appearance of the belt over time can be minimized.
【００１３】[0013]
【実施例】本発明の実施例と比較例を挙げ、夫々の耐光
性を比較し、本発明の効果を確かめる。実施例１として
ポリウレタン１００重量部にベンゾトリアゾール系の紫
外線吸収剤とヒンダードアミン系の紫外線安定剤とヒン
ダードフェノール系の酸化防止剤のブレンド比が２：
２：１の割合で混ぜたものを耐光安定剤として２重量部
添加したものからなるＬ型のタイミングベルトを用い、
実施例２としてポリウレタン１００重量部にベンゾトリ
アゾール系の紫外線吸収剤とヒンダードアミン系の紫外
線安定剤とヒンダードフェノール系の酸化防止剤のブレ
ンド比が２：２：１の割合で混ぜたものを耐光安定剤と
して０．２重量部添加したものからなるＬ型のタイミン
グベルトを用いた。比較例１としてポリウレタンに耐光
安定剤を添加していないＬ型のタイミングベルトを用
い、比較例２としてポリウレタン１００重量部にベンゾ
トリアゾール系の紫外線吸収剤とヒンダードフェノール
系の酸化防止剤をブレンド比が１：１で混ぜたものを耐
光安定剤として２重量部添加したものからなるＬ型のタ
イミングベルトを用い、比較例３としてポリウレタン１
００重量部にベンゾトリアゾール系の紫外線吸収剤とヒ
ンダードアミン系の紫外線安定剤とヒンダードフェノー
ル系の酸化防止剤のブレンド比が２：２：１の割合で混
ぜたものを耐光安定剤として０．１重量部添加したもの
からなるＬ型のタイミングベルトを用いた。EXAMPLES The effects of the present invention will be confirmed by comparing the respective light resistances of the examples of the present invention and comparative examples. As Example 1, a blend ratio of a benzotriazole-based UV absorber, a hindered amine-based UV stabilizer and a hindered phenol-based antioxidant to 100 parts by weight of polyurethane was 2:
Using an L-type timing belt composed of 2 parts by weight of a light-resistant stabilizer mixed in a ratio of 2: 1,
In Example 2, 100 parts by weight of polyurethane was mixed with a benzotriazole-based UV absorber, a hindered amine-based UV stabilizer, and a hindered phenol-based antioxidant at a blending ratio of 2: 2: 1, and the resulting mixture was light-stabilized. An L-type timing belt formed by adding 0.2 parts by weight as an agent was used. As Comparative Example 1, an L-type timing belt containing no light stabilizer added to polyurethane was used, and as Comparative Example 2, 100 parts by weight of polyurethane was blended with a benzotriazole-based ultraviolet absorber and a hindered phenol-based antioxidant. As a comparative example 3, polyurethane 1 was used as a comparative example 3 using an L-type timing belt composed of a mixture of 1: 1 and 2 parts by weight as a light stabilizer.
A benzotriazole-based UV absorber, a hindered amine-based UV stabilizer, and a hindered phenol-based antioxidant were mixed in a blend ratio of 2: 2: 1 in an amount of 0.1 parts as a light fastness stabilizer. An L-type timing belt formed by adding parts by weight was used.
【００１４】以上５種のタイミングベルトで加速変色テ
スト（サンシャインテスト）を行った。加速変色テスト
（サンシャインテスト）はサンシャインカーボンウェザ
ーメーターを使用し、温度条件は６３±３℃とした。変
色判定方法は、ハンター色差式を使用し測定値は、Ｌ、
ａ、ｂ、ΔＬ、Δａ、Δｂ、ΔＥ（Ｈ）で基準値として
サンシャインテスト前のサンプルのＬ、ａ、ｂを用い、
色差ΔＥ（Ｈ）を 色差ΔＥ（Ｈ）＝〔（ΔＬ）2 ＋（Δａ）2 ＋（Δｂ）2 〕1/2 の式で算出しサンシャイン時間に対する色差ΔＥ（Ｈ）
の値をグラフにした。その結果を図２に示す。An accelerated discoloration test (sunshine test) was carried out using the above five types of timing belts. For the accelerated discoloration test (sunshine test), a sunshine carbon weather meter was used, and the temperature condition was 63 ± 3 ° C. The color change determination method uses the Hunter color difference formula, and the measured value is L,
a, b, ΔL, Δa, Δb, ΔE (H) are used as the reference values, and L, a, and b of the sample before the sunshine test are used,
The color difference ΔE (H) is calculated by the formula of color difference ΔE (H) = [(ΔL) 2 + (Δa) 2 + (Δb) 2 ] 1/2 , and the color difference ΔE (H) with respect to the sunshine time is calculated.
The value of is plotted. The result is shown in FIG.
【００１５】何も添加しなかった比較例１は、耐光安定
剤を２重量部添加した実施例１よりも１２倍以上の速度
で変色を起こしている。更に、変色の収束点で、変色程
度が比較例１は実施例１と比べて倍になっている。ま
た、比較例２および比較例３と比べても実施例１、実施
例２はかなり変色の度合いは小さくなっている。よっ
て、変色を充分に防止するには耐光安定剤をポリウレタ
ン１００重量部に対して０．２重量部は添加する必要が
あり、ベンゾトリアゾール系の紫外線吸収剤とヒンダー
ドアミン系の紫外線安定剤および、ヒンダードフェノー
ル系の酸化防止剤の三つの成分からなり、ベンゾトリア
ゾール系の紫外線吸収剤の三成分を添加することが必須
である。In Comparative Example 1 in which nothing was added, discoloration occurred at a rate 12 times or more than in Example 1 in which 2 parts by weight of the light fastness stabilizer was added. Further, at the convergence point of discoloration, the degree of discoloration is doubled in Comparative Example 1 as compared with Example 1. Further, compared with Comparative Examples 2 and 3, the degree of discoloration in Examples 1 and 2 is considerably small. Therefore, in order to sufficiently prevent discoloration, it is necessary to add 0.2 part by weight of a light-resistant stabilizer to 100 parts by weight of polyurethane. A benzotriazole-based UV absorber, a hindered amine-based UV stabilizer, and a hinder It consists of three components of dephenol type antioxidant, and it is essential to add three components of benzotriazole type ultraviolet absorber.
【００１６】次に、前述の実施例１のタイミングベルト
と同じ配合であるポリウレタン１００重量部にベンゾト
リアゾール系の紫外線吸収剤とヒンダードアミン系の紫
外線安定剤とヒンダードフェノール系の酸化防止剤のブ
レンド比が２：２：１の割合で混ぜたものを耐光安定剤
として２重量部添加したポリウレタン組成物を用い、コ
ンチ式金型にてシートを作製したものを実施例３とし、
実施例４としてポリウレタン１００重量部にベンゾトリ
アゾール系の紫外線吸収剤とヒンダードアミン系の紫外
線安定剤とヒンダードフェノール系の酸化防止剤のブレ
ンド比が２：２：１の割合で混ぜたものを耐光安定剤と
して３重量部添加したものを用い、実施例２と同様に作
製したシートを用意し、比較例４としてポリウレタン１
００重量部にベンゾトリアゾール系の紫外線吸収剤とヒ
ンダードアミン系の紫外線安定剤とヒンダードフェノー
ル系の酸化防止剤のブレンド比が２：２：１の割合で混
ぜたものを耐光安定剤として５重量部添加したものを用
い、実施例２と同様に作製したシートを用意した。Next, 100 parts by weight of polyurethane having the same composition as that of the timing belt of Example 1 was blended with a benzotriazole-based UV absorber, a hindered amine-based UV stabilizer and a hindered phenol-based antioxidant. Was mixed at a ratio of 2: 2: 1, and 2 parts by weight of a polyurethane composition added as a light-resistant stabilizer was used to prepare a sheet with a Conti type mold as Example 3.
In Example 4, 100 parts by weight of polyurethane was mixed in a blend ratio of a benzotriazole-based UV absorber, a hindered amine-based UV stabilizer and a hindered phenol-based antioxidant at a blending ratio of 2: 2: 1. A sheet prepared in the same manner as in Example 2 was prepared using 3 parts by weight of the agent, and as Comparative Example 4, polyurethane 1 was used.
A mixture of 00 parts by weight of a benzotriazole-based UV absorber, a hindered amine-based UV stabilizer and a hindered phenol-based antioxidant at a blending ratio of 2: 2: 1 is used as a light fastness stabilizer in 5 parts by weight. A sheet prepared in the same manner as in Example 2 was prepared by using the added one.
【００１７】これらの実施例３と実施例４と比較例４の
シートを使って静的物性の評価を行った。シート作製条
件は次のとおりである。 原料温度：６０℃ キュアー条件：１１０℃×３ｈｒｓ＋６０℃×２４ｈｒｓThe sheets of Examples 3 and 4 and Comparative Example 4 were used to evaluate static physical properties. The sheet manufacturing conditions are as follows. Raw material temperature: 60 ° C. Cure condition: 110 ° C. × 3 hrs + 60 ° C. × 24 hrs
【００１８】[0018]
【表１】[Table 1]
【００１９】表１からわかるように、耐光安定剤の添加
量がポリウレタン１００重量部に対し２．０重量部であ
る実施例３と３．０重量部である実施例４と比べて５．
０重量部である比較例４は物性が低下しており、耐光安
定剤はポリウレタン１００重量部に対して４．０重量部
以内であることが必要となる。As can be seen from Table 1, in comparison with Example 3 in which the amount of the light stabilizer added was 2.0 parts by weight to 100 parts by weight of polyurethane and Example 4 in which the amount was 3.0 parts by weight,
In Comparative Example 4 which is 0 parts by weight, the physical properties are deteriorated, and it is necessary that the light resistance stabilizer is within 4.0 parts by weight with respect to 100 parts by weight of polyurethane.
【００２０】[0020]
【発明の効果】以上のように、ポリウレタン製の伝動ベ
ルトにおいて、ポリウレタンにベンゾトリアゾール系の
紫外線吸収剤とヒンダードアミン系の紫外線安定剤とヒ
ンダードフェノール系の酸化防止剤の３種をブレンドし
た耐光安定剤を添加しているため、紫外線吸収剤と紫外
線安定剤の相乗効果で変色速度を遅くすることができる
ので、外観的経時変化を従来のベルトに比べて小さくす
ることができる。そのことによって、ベルトを長時間に
渡って使用しても優れた外観を保つことができ、また、
長期の保管にも耐えうるベルトを得ることができる。更
に、酸化防止剤の効果により、日光暴露後の歯部剪断強
度および耐摩耗性が改善され、伝動ベルトとしての耐久
性を向上させることもできる。As described above, in a transmission belt made of polyurethane, light resistance stability obtained by blending polyurethane with a benzotriazole type ultraviolet absorber, a hindered amine type ultraviolet stabilizer and a hindered phenol type antioxidant is blended. Since the agent is added, the discoloring speed can be slowed down by the synergistic effect of the ultraviolet absorber and the ultraviolet stabilizer, so that the change with time in appearance can be made smaller than that of the conventional belt. As a result, it is possible to maintain a good appearance even if the belt is used for a long time, and
A belt that can withstand long-term storage can be obtained. Furthermore, due to the effect of the antioxidant, the shear strength and wear resistance of the tooth portion after exposure to sunlight are improved, and the durability as a transmission belt can be improved.
【図１】本発明を実施したポリウレタン製伝動ベルトの
側面図である。FIG. 1 is a side view of a polyurethane transmission belt embodying the present invention.
【図２】サンシャイン時間に対し色差（ΔＥ）をプロッ
トしたグラフであるFIG. 2 is a graph plotting color difference (ΔE) against sunshine time.
１ 伝動ベルト ２ 心線 ３ ポリウレタン弾性体 ４ 歯部 ５ 溝部 1 Transmission Belt 2 Core Wire 3 Polyurethane Elastic Body 4 Teeth 5 Groove
Claims (6)
埋設した伝動ベルトにおいて、ポリウレタン弾性体には
ベンゾトリアゾール系の紫外線吸収剤とヒンダードアミ
ン系紫外線安定剤及びヒンダードフェノール系の酸化防
止剤をブレンドした耐光安定剤を添加した組成物を用い
たことを特徴とするポリウレタン製伝動ベルト。1. A transmission belt comprising a polyurethane elastic body having a core wire embedded in the longitudinal direction, wherein the polyurethane elastic body is blended with a benzotriazole type ultraviolet absorber, a hindered amine type ultraviolet stabilizer and a hindered phenol type antioxidant. A transmission belt made of polyurethane, characterized by using a composition to which the above-mentioned light resistance stabilizer is added.
０重量部に対して０．２〜４．０重量部である請求項１
記載のポリウレタン製伝動ベルト。2. The amount of the light fastness stabilizer added is polyurethane 10
0.2 to 4.0 parts by weight with respect to 0 parts by weight.
The polyurethane transmission belt described.
安定剤を構成するベンゾトリアゾール系の紫外線吸収剤
が０．０８〜１．６重量部、ヒンダードアミン系の紫外
線安定剤が０．０８〜１．６重量部、ヒンダードフェノ
ール系の酸化防止剤が０．０４〜０．８重量部で構成さ
れる請求項１または２記載のポリウレタン製伝動ベル
ト。3. A benzotriazole-based UV absorber, which constitutes a light resistance stabilizer, is 0.08 to 1.6 parts by weight, and a hindered amine-based UV stabilizer is 0.08 to 1.6, relative to 100 parts by weight of polyurethane. The polyurethane transmission belt according to claim 1 or 2, wherein the amount of the hindered phenolic antioxidant is 0.04 to 0.8 parts by weight.
埋設した伝動ベルトに用いる伝動ベルト用ポリウレタン
組成物において、ポリウレタンにベンゾトリアゾール系
の紫外線吸収剤とヒンダードアミン系紫外線安定剤及び
ヒンダードフェノール系の酸化防止剤をブレンドした耐
光安定剤を添加したことを特徴とする伝動ベルト用ポリ
ウレタン組成物。4. A polyurethane composition for a power transmission belt, which is used for a power transmission belt in which a cord is embedded in a polyurethane elastic body in a longitudinal direction, wherein the polyurethane comprises a benzotriazole type ultraviolet absorber, a hindered amine type ultraviolet stabilizer and a hindered phenol type. A polyurethane composition for a power transmission belt, comprising a light resistance stabilizer blended with an antioxidant.
０重量部に対して０．２〜４．０重量部である請求項４
記載の伝動ベルト用ポリウレタン組成物。5. The polyurethane 10 is added in an amount of the light fastness stabilizer.
It is 0.2 to 4.0 parts by weight with respect to 0 parts by weight.
A polyurethane composition for a power transmission belt as described above.
安定剤を構成するベンゾトリアゾール系の紫外線吸収剤
が０．０８〜１．６重量部、ヒンダードアミン系の紫外
線安定剤が０．０８〜１．６重量部、ヒンダードフェノ
ール系の酸化防止剤が０．０４〜０．８重量部で構成さ
れる請求項４または５記載の伝動ベルト用ポリウレタン
組成物。6. A benzotriazole-based UV absorber, which constitutes a light resistance stabilizer, is 0.08 to 1.6 parts by weight, and a hindered amine-based UV stabilizer is 0.08 to 1.6, relative to 100 parts by weight of polyurethane. The polyurethane composition for a power transmission belt according to claim 4 or 5, wherein the weight ratio of the hindered phenol antioxidant is 0.04 to 0.8 weight part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35088992A JPH0816504B2 (en) | 1992-12-04 | 1992-12-04 | Polyurethane transmission belt and polyurethane composition for transmission belt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35088992A JPH0816504B2 (en) | 1992-12-04 | 1992-12-04 | Polyurethane transmission belt and polyurethane composition for transmission belt |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06235442A JPH06235442A (en) | 1994-08-23 |
| JPH0816504B2 true JPH0816504B2 (en) | 1996-02-21 |
Family
ID=18413588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35088992A Expired - Fee Related JPH0816504B2 (en) | 1992-12-04 | 1992-12-04 | Polyurethane transmission belt and polyurethane composition for transmission belt |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0816504B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008024951A (en) * | 1999-10-18 | 2008-02-07 | Konica Minolta Holdings Inc | Cellulose ester film |
| JP5129486B2 (en) * | 2006-01-20 | 2013-01-30 | 三井化学株式会社 | Thermoplastic polyurethane resin composition and moisture-permeable film |
-
1992
- 1992-12-04 JP JP35088992A patent/JPH0816504B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06235442A (en) | 1994-08-23 |
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