JPH0319265B2 - - Google Patents
Info
- Publication number
- JPH0319265B2 JPH0319265B2 JP61303872A JP30387286A JPH0319265B2 JP H0319265 B2 JPH0319265 B2 JP H0319265B2 JP 61303872 A JP61303872 A JP 61303872A JP 30387286 A JP30387286 A JP 30387286A JP H0319265 B2 JPH0319265 B2 JP H0319265B2
- Authority
- JP
- Japan
- Prior art keywords
- tube
- resins
- thermoplastic polyamide
- polyamide elastomer
- weight
- 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 - Lifetime
Links
- 229920001971 elastomer Polymers 0.000 claims description 48
- 239000000806 elastomer Substances 0.000 claims description 42
- 229920006345 thermoplastic polyamide Polymers 0.000 claims description 37
- 230000014759 maintenance of location Effects 0.000 claims description 25
- 229920005989 resin Polymers 0.000 claims description 16
- 239000011347 resin Substances 0.000 claims description 16
- 229920003002 synthetic resin Polymers 0.000 claims description 14
- 239000000057 synthetic resin Substances 0.000 claims description 14
- 230000004888 barrier function Effects 0.000 claims description 10
- 239000004645 polyester resin Substances 0.000 claims description 6
- 229920001225 polyester resin Polymers 0.000 claims description 6
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 claims description 5
- 229920001328 Polyvinylidene chloride Polymers 0.000 claims description 5
- 239000005033 polyvinylidene chloride Substances 0.000 claims description 5
- 229920000178 Acrylic resin Polymers 0.000 claims description 4
- 239000004925 Acrylic resin Substances 0.000 claims description 4
- 229920005749 polyurethane resin Polymers 0.000 claims description 4
- 239000004800 polyvinyl chloride Substances 0.000 claims description 4
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 4
- QHIWVLPBUQWDMQ-UHFFFAOYSA-N butyl prop-2-enoate;methyl 2-methylprop-2-enoate;prop-2-enoic acid Chemical compound OC(=O)C=C.COC(=O)C(C)=C.CCCCOC(=O)C=C QHIWVLPBUQWDMQ-UHFFFAOYSA-N 0.000 claims description 3
- 229920006122 polyamide resin Polymers 0.000 claims description 3
- 229920003225 polyurethane elastomer Polymers 0.000 claims 1
- 235000019589 hardness Nutrition 0.000 description 11
- 238000005299 abrasion Methods 0.000 description 10
- 239000000203 mixture Substances 0.000 description 10
- 230000035882 stress Effects 0.000 description 8
- 229920005549 butyl rubber Polymers 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 230000035699 permeability Effects 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 6
- 238000001125 extrusion Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 229920006173 natural rubber latex Polymers 0.000 description 5
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 4
- 229920002292 Nylon 6 Polymers 0.000 description 4
- 239000004952 Polyamide Substances 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 229920002647 polyamide Polymers 0.000 description 4
- JHWNWJKBPDFINM-UHFFFAOYSA-N Laurolactam Chemical compound O=C1CCCCCCCCCCCN1 JHWNWJKBPDFINM-UHFFFAOYSA-N 0.000 description 3
- 230000032683 aging Effects 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 229920001451 polypropylene glycol Polymers 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000004721 Polyphenylene oxide Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229920000570 polyether Polymers 0.000 description 2
- -1 polyoxyethylene Polymers 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- IMROMDMJAWUWLK-UHFFFAOYSA-N Ethenol Chemical compound OC=C IMROMDMJAWUWLK-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 229920000571 Nylon 11 Polymers 0.000 description 1
- 229920000299 Nylon 12 Polymers 0.000 description 1
- 229920002302 Nylon 6,6 Polymers 0.000 description 1
- 229920000572 Nylon 6/12 Polymers 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 229920001400 block copolymer Polymers 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229920006026 co-polymeric resin Polymers 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 229920006039 crystalline polyamide Polymers 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007151 ring opening polymerisation reaction Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000003856 thermoforming Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
Description
（産業上の利用分野）
本発明は、二輪車、特に自転車及び自動二輪車
等に好適に用いられる、軽量で優れた空気保持性
と耐久性及び走行性を有する新規なチユーブに関
するものである。
（従来の技術）
近年、自転車及び自動二輪車等の二輪車は、そ
の取扱いの手軽さと経済的な利点から社会生活の
中に深く浸透し愛用されているが、一方でこれら
取扱い性及び経済性等に対する改良も積極的に行
われ、その一環として車体の軽量化が盛んに検討
されている。
ところで、こうした車体の軽量化が進む中にあ
つて、自転車、自動二輪車等のチユーブには、従
来よりブチルゴムあるいは天然ゴムラテツクス等
を押出加硫したチユーブが主として使用されてい
る。
しかしながらこれらのうち、ブチルゴムチユー
ブは空気、保持性と耐老化性が比較的良好である
が、強度及び耐摩耗性に問題があるためパンクや
バーストを起しやすく耐久性の点で不充分であ
り、また天然ゴムラテツクスチユーブは強度を弾
力性に優れるものの空気保持性及び耐老化性に問
題があるなど、いづれの場合も耐久性あるいは空
気保持性等に根本的な問題を抱えているために、
チユーブの厚肉化を余儀なくされているのが現状
であり、従つてチユーブ自体の軽量化については
これまでほとんど検討されずに今日に至つてい
る。
（発明が解決しようとする問題点）
本発明は、上記事情に鑑みなされたものであ
り、その目的とするところは、これまで自転車及
び自動二輪車等においてほとんどかえりみられな
かつたチユーブの軽量化の問題を改善すると共
に、併せて優れた空気保持性と耐久性、走行性並
びにチユーブ成形加工性等を兼備した新規で実用
性の高い二輪車用チユーブを提供する点にある。
（問題点を解決するための手段）
本発明者等は、チユーブの軽量化に加えて優れ
た空気保持性を有する、耐久性、走行性、チユー
ブ成形加工性の良好な二輪車用チユーブを得るた
め、これまでゴム製指向の強かつたこの種のチユ
ーブに対する概念を打ち破り、新たな素材を開発
すべく鋭意検討を重ねた結果、特定の熱可塑性ポ
リアミドエラストマーが空気保持性にやや問題が
あるものの、低密度軽量で、しかも優れた耐久性
と柔軟性、弾力性等を具備している点に着目し、
かかる熱可塑性ポリアミドエラストマーに更に気
体遮断性に優れた合成樹脂を特定割合でブレンド
すれば、この種のチユーブに必要とされる、例え
ばバルブゴム座の接着あるいはチユーブ継ぎ合せ
といつた成形加工性、走行性などの特殊な要求性
能を損うことなく軽量化と空気保持性の問題を改
善し得ることを見出し本発明を完成させた。
即ち本発明は、熱可塑性ポリアミドエラストマ
ーを主体としてなる二輪車用チユーブにおいて、
該チユーブがシヨアーＡ硬度70〜93Hsの熱可塑
性ポリアミドエラストマー50〜95重量％と、前記
熱可塑性ポリアミドエラストマーより高い気体遮
断性を有するポリ塩化ビニル系樹脂、ポリ塩化ビ
ニリデン系樹脂、ポリエステル系樹脂、ポリアミ
ド系樹脂、エチレン−ビニルアルコール系共重合
樹脂、アクリル系樹脂、ポリウレタン系樹脂及び
これらのエラストマーから選ばれた１種あるいは
それ以上の組合せからなる合成樹脂５〜50重量％
とのブレンド樹脂よりなり、且つJISK6304に規
定する永久伸びが40％以下であることを特徴とす
る空気保持性に優れた二輪車用軽量チユーブに係
るものである。
以下、本発明の空気保持性に優れた二輪車用軽
量チユーブについて、その構成並びに作用効果を
詳しく説明する。
本発明で用いる熱可塑性ポリアミドエラストマ
ーとは、ハードセグメントとして作用するナイロ
ン６、ナイロン66、ナイロン11、ナイロン12、ナ
イロン612等のポリアミド成分と、ソフトセグメ
ントとして作用するポリオキシエチレングリコー
ル、ポリオキシプロピレングリコール、ポリオキ
シテトラメチレングリコール等のポリエーテル成
分とからなる下記一般式で表わされるところのブ
ロツクコポリマーである。
但し、PA：ポリアミド成分、PE：ポリエーテ
ル成分である。
この熱可塑性ポリアミドエラストマーは、樹脂
密度がブチルゴム及び天然ゴムラテツクスの密度
1.1〜1.3ｇ／cm3に比べて0.9〜1.0ｇ／cm3と低く、
チユーブの軽量化を図るには格好の素材である
が、ハードセグメントとソフトセグメントの比率
によつてその性質が大きく変化し、例えばハード
セグメントの比率が高い場合は優れた耐摩耗性と
気体遮断性が期待されるにもかかわらず硬度が高
いために走行性が悪く、一方ソフトセグメントの
比率が高い場合は硬度が低く優れた走行性を有す
る反面気体遮断性が不充分であるなど、それぞれ
一長一短があつて二輪車用チユーブへの応用が困
難であつた。
本発明の空気保持性に優れた二輪車用軽量チユ
ーブは、かかる熱可塑性ポリアミドエラストマー
のうち70〜93Hs、好ましくは75〜90Hsのシヨア
ーＡ硬度のものを用いることを必須を要件とする
ものである。その理由は、熱可塑性ポリアミドエ
ラストマーは前記の如くハードセグメントとソフ
トセグメントの比率によつて、硬度をはじめ弾力
性、柔軟性、耐摩耗性、気体遮断性等の諸性質が
大きく変化する関係上、シヨア−Ａ硬度が70Hs
未満の場合は得られるチユーブの耐摩耗性と空気
保持性の改善が困難であるのに対し、シヨア−Ａ
硬度が93Hsより大きくなると柔軟性が根本的に
不足して優れた走行性が望めないためである。
尚、かかる熱可塑性ポリアミドエラストマーに
は、その性質を大きく変えない範囲内で他の成分
を共重合することができるほか、必要に応じて適
宜の滑材、紫外線の吸収剤、酸化防止剤、着色剤
等を添加してもよい。
一方、前記熱可塑性ポリアミドエラストマーに
ブレンドされる合成樹脂とは、得られるチユーブ
の空気保持性を改善し得るものでなければならな
い関係上、本質的に熱可塑性ポリアミドエラスト
マーとブレンドでき、しかも気体遮断性が前記熱
可塑性ポリアミドエラストマーより優れるもので
なければならない。かかる性質を満足する合成樹
脂としては、第１表に示した熱可塑性ポリアミド
エラストマーと各種樹脂との相溶性並びに空気透
過係数に関する測定値からポリ塩化ビニル系樹
脂、ポリ塩化ビニリデン系樹脂、ポリエステル系
樹脂、ポリアミド系樹脂、エチレン−ビニルアル
コール系共重合樹脂、アクリル系樹脂、ポリウレ
タン系樹脂、及びこれらのエラストマーから選ば
れた一種あるいはそれ以上の組合せからなるもの
が挙げられるが、これらの中では空気透過係数が
２c.c.・mm／cm2・sec・cmHg1010以下の例えばポリ
塩化ビニル系樹脂、ポリ塩化ビニリデン系樹脂、
ポリエステル系樹脂、ポリアミド系樹脂、エチレ
ン−ビニルアルコール系共重合樹脂、アクリル系
樹脂及びこれらのエラストマー等が少いブレンド
比で高い空気保持性を発揮できる点で好ましい。
(Industrial Application Field) The present invention relates to a novel tube that is lightweight and has excellent air retention, durability, and running properties, and is suitably used for motorcycles, particularly bicycles, motorcycles, and the like. (Prior Art) In recent years, two-wheeled vehicles such as bicycles and motorcycles have become deeply popular in social life due to their ease of handling and economical advantages. Improvements are being made actively, and as part of these efforts, weight reduction of the vehicle body is being actively considered. By the way, as the weight of vehicle bodies continues to be reduced, tubes made of extrusion and vulcanization of butyl rubber or natural rubber latex have conventionally been mainly used for tubes for bicycles, motorcycles, etc. However, among these, butyl rubber tubes have relatively good air retention and aging resistance, but have problems with strength and abrasion resistance, making them prone to punctures and bursts, making them insufficient in terms of durability. In addition, although natural rubber latex tubes have excellent strength and elasticity, they have problems with air retention and aging resistance. ,
The current situation is that tubes have to be made thicker, and to this day, little consideration has been given to reducing the weight of the tube itself. (Problems to be Solved by the Invention) The present invention has been made in view of the above circumstances, and its purpose is to solve the problem of reducing the weight of tubes, which has hardly been considered in bicycles, motorcycles, etc. The object of the present invention is to provide a new and highly practical tube for a two-wheeled vehicle that has excellent air retention properties, durability, running properties, tube molding processability, etc. (Means for Solving the Problems) The present inventors aimed to obtain a tube for two-wheeled vehicles that is lightweight, has excellent air retention properties, and has good durability, runnability, and tube molding processability. As a result of intensive research to develop a new material, breaking away from the concept of this type of tube that had previously been strongly oriented to rubber, we found that a specific thermoplastic polyamide elastomer has some problems with air retention, but Focusing on the fact that it is low density, lightweight, and has excellent durability, flexibility, and elasticity,
By blending such a thermoplastic polyamide elastomer with a synthetic resin with excellent gas barrier properties in a specific proportion, it is possible to improve the moldability and running properties needed for this type of tube, such as adhesion of valve rubber seats and tube jointing. We have completed the present invention by discovering that it is possible to reduce weight and improve air retention without compromising special required performance such as performance. That is, the present invention provides a motorcycle tube mainly made of thermoplastic polyamide elastomer,
The tube contains 50 to 95% by weight of a thermoplastic polyamide elastomer having a Shore A hardness of 70 to 93 Hs, and a polyvinyl chloride resin, a polyvinylidene chloride resin, a polyester resin, and a polyamide having a higher gas barrier property than the thermoplastic polyamide elastomer. 5 to 50% by weight of a synthetic resin consisting of one or more combinations selected from polyurethane resins, ethylene-vinyl alcohol copolymer resins, acrylic resins, polyurethane resins, and these elastomers.
The present invention relates to a lightweight tube for two-wheeled vehicles with excellent air retention properties, which is made of a blend resin of Hereinafter, the structure and effects of the lightweight tube for two-wheeled vehicles with excellent air retention properties of the present invention will be explained in detail. The thermoplastic polyamide elastomer used in the present invention includes polyamide components such as nylon 6, nylon 66, nylon 11, nylon 12, and nylon 612 that act as hard segments, and polyoxyethylene glycol and polyoxypropylene glycol that act as soft segments. It is a block copolymer represented by the following general formula consisting of a polyether component such as , polyoxytetramethylene glycol, etc. However, PA: polyamide component, PE: polyether component. This thermoplastic polyamide elastomer has a resin density that is similar to that of butyl rubber and natural rubber latex.
Low at 0.9-1.0g/cm3 compared to 1.1-1.3g/ cm3 ,
It is an excellent material for reducing the weight of tubes, but its properties change greatly depending on the ratio of hard segments to soft segments. For example, when the ratio of hard segments is high, it has excellent abrasion resistance and gas barrier properties. Although high hardness is expected, running performance is poor due to high hardness, whereas when the proportion of soft segments is high, hardness is low and excellent running properties are achieved, but gas barrier properties are insufficient. At the time, it was difficult to apply it to tubes for motorcycles. The lightweight tube for two-wheeled vehicles with excellent air retention properties of the present invention requires the use of thermoplastic polyamide elastomers having a Shore A hardness of 70 to 93 Hs, preferably 75 to 90 Hs. The reason for this is that, as mentioned above, the properties of thermoplastic polyamide elastomers, such as hardness, elasticity, flexibility, abrasion resistance, and gas barrier properties, vary greatly depending on the ratio of hard segments to soft segments. Shore A hardness is 70Hs
If it is less than
This is because when the hardness is greater than 93Hs, flexibility is fundamentally insufficient and excellent running performance cannot be expected. In addition, other components can be copolymerized with the thermoplastic polyamide elastomer within a range that does not significantly change its properties, and if necessary, suitable lubricants, ultraviolet absorbers, antioxidants, and colorants can be added to the thermoplastic polyamide elastomer. Agents etc. may be added. On the other hand, the synthetic resin blended with the thermoplastic polyamide elastomer must be able to improve the air retention properties of the resulting tube, so it must be able to essentially blend with the thermoplastic polyamide elastomer and have gas barrier properties. must be superior to the thermoplastic polyamide elastomer. Synthetic resins that satisfy these properties include polyvinyl chloride resins, polyvinylidene chloride resins, and polyester resins based on the measured values of the compatibility of the thermoplastic polyamide elastomer with various resins and the air permeability coefficient shown in Table 1. , polyamide resin, ethylene-vinyl alcohol copolymer resin, acrylic resin, polyurethane resin, and one or more combinations of these elastomers. For example, polyvinyl chloride resin, polyvinylidene chloride resin, with a coefficient of 2c.c.・mm/cm 2・sec・cmHg10 10 or less,
Polyester resins, polyamide resins, ethylene-vinyl alcohol copolymer resins, acrylic resins, and their elastomers are preferred because they can exhibit high air retention with a small blend ratio.
【表】
尚、これら合成樹脂は、いづれも前記熱可塑性
ポリアミドエラストマーとブレンドできるが、通
常熱可塑性ポリアミドエラストマーの熱成形温度
が150〜230℃である関係上、本発明で用いる合成
樹脂もそれに近い温度で熱成形できるよう適宜変
性あるいは共重合されたものがより好ましい。
本発明の空気保持性に優れた二輪車用軽量チユ
ーブは、このように熱可塑性ポリアミドエラスト
マーに、それより高い気体遮断性を有する合成樹
脂をブレンドしたものであるが、その際のブレン
ド比率は熱可塑性ポリアミドエラストマー50〜95
重量％、好ましくは60〜90重量％に対して、合成
樹脂５〜50重量％、好ましくは10〜40重量％であ
る。即ち、チユーブ素材中の合成樹脂のブレンド
比率が５重量％未満の場合は空気保持性の改善が
期待できず、また合成樹脂のブレンド比率が50重
量％を超えると、熱可塑性ポリアミドエラストマ
ーの優れた高周波あるいは熱等による接着性が阻
害されるため、チユーブ成形加工の際にバルブゴ
ム座の接着不良又はチユーブの接合不良といつた
トラブルが発生するほか、パンク補修の際にもパ
ツチゴムの接着が悪くなるなど、二輪車用チユー
ブに係る特有の不都合な問題が生じるものであ
る。
本発明の空気保持性に優れた二輪車用軽量チユ
ーブは、更にJISK6304に規定する永久伸びが40
％以下、好ましくは30％以下である。なぜなら、
本発明の如き二輪車用チユーブにおいては、優れ
た柔軟性と弾力性に基づく快適な走行性が不可欠
とされるが、周知の如く熱可塑性ポリアミドエラ
ストマーは、そのハードセグメントを形成するポ
リアミド成分が結晶性を有するために、凹凸のは
げしい路面では走行中のチユーブに発生する局部
的な伸縮によつて一部に配向結晶化が起り、一
旦、配向結晶化が起るとその部分の弾力性が低下
して走行性に著しい悪影響を及ぼすのであり、従
つてかかるチユーブの配向結晶化による走行性の
悪化を防止するには、永久伸びがJISK6304に規
定する方法で測定した場合に40％以下でなければ
ならないのである。
（実施例）
以下、本発明の空気保持性に優れた二輪車用軽
量チユーブを更に理解しやすくするために、実施
例により詳しく説明するが、本発明はこれら実施
例に限定されるものではない。尚、本発明の空気
保持性に優れた二輪車用軽量チユーブについて行
つた物性の測定法並びに評価方法は次の如くであ
る。
(1) 空気透過率（単位：c.c.／cm2・atm・24hr）
ASTMD1434−82に準じて透過率を測定した。
(2) 100％モジユラス応力（単位：Kg／cm2）
JISK6301−1975に規定する方法で引張試験を
行い、100％伸張時における荷重（単位：Kg）
と試験片の断面積（単位：cm2）から次式で算出
した。
100％モジユラス応力＝
100％伸長時における荷重／試験片の断面積
尚、この100％モジユラス応力は、チユーブ
の柔軟性の指標となるもので、この値が150
Kg／cm2以上になるとチユーブが硬く走行性が著
しく悪化する。
(3) 永久伸び（単位：％）
JISK6304−1982に規定する方法で測定した。
尚、この永久伸びは、チユーブの弾力性の指標
となるもので、この値が大きくなるとクツシヨ
ン性が低下して走行性が悪化する。
(4) 耐摩耗性（単位：mg）
JISK7204に規定する方法で測定した。測定
に用いた摩耗輪はＨ−22、荷重1000ｇとした。
尚、この耐摩耗性は、チユーブの耐久性を評価
する目安としたもので、摩耗量が300mg以上に
なると従来のブチルゴム及び天然ゴムラテツク
スチユーブの場合に見られたと同様、走行中タ
イヤとの摩擦によるチユーブの損傷がはげしく
耐久性に乏しい。
(5) チユーブ成形加工性
チユーブの成形加工性に際し、高周波ウエル
ダーによるバルブゴム座の接着性並びにチユー
ブの継ぎ合せ加工性を主として評価したもの
で、いづれも支障なく加工できたものを（〇）、
バルブゴム座の接着あるいはチユーブ接合のい
づれかで接着不良が認められたものを（×）と
した。
(6) 総合評価
空気透過率、100％モジユラス応力、永久伸
び、耐摩耗性、チユーブ成形加工性等の測定結
果をもとに、二輪車用チユーブとしての適否を
総合的に評価したもので、非常に適しているも
のを（〇）、やや適しているものを（Δ）、不適
のものを（×）とした。
実施例１〜３、比較例１〜２
ポリアミド形成成分としてラウリルラクタム
と、ポリエーテル形成成分としてのポリオキシプ
ロピレングリコールを開環重合した後、更に重縮
合させることによつて熱可塑性ポリアミドエラス
トマーを生成するに際し、ラウリルラクタムとポ
リオキシプロピレングリコールの仕込み量を変え
ることによつて硬度の種々異なる熱可塑性ポリア
ミドエラストマーを生成した。
次にこれら熱可塑性ポリアミドエラストマー70
重量％と共重合ポリエステル樹脂（密度1.30、融
点151℃）30重量％をドライブレンドした原料を
50φ押出機にて、押出温度170〜230℃、押出量約
22Kg／hrの条件でリツプ径17.2φの環状ダイスか
ら押出し、そのまま11.3m／minの速度で引取る
ことにより折径27mm、厚さ600μのチユーブを作
成した。
尚、得られたチユーブの密度は全て0.96〜1.01
ｇ／cm3と軽量であつた。これら硬度の種々異なる
熱可塑性ポリアミドエラストマーと共重合ポリエ
ステル樹脂とのブレンド樹脂よりなるチユーブに
ついて、空気透過率、100％モジユラス応力、永
久伸び、耐摩耗性及びチユーブ成形加工性等の評
価結果を第２表に示した。同表より熱可塑性ポリ
アミドエラストマーの硬度が本発明の範囲にある
チユーブは優れた空気保持性と走行性、耐久性並
びにチユーブ成形加工性を有し、二輪車用チユー
ブとして好適であつた。[Table] Any of these synthetic resins can be blended with the thermoplastic polyamide elastomer, but since the thermoforming temperature of thermoplastic polyamide elastomer is usually 150 to 230°C, the synthetic resin used in the present invention is also blended with the thermoplastic polyamide elastomer. It is more preferable to appropriately modify or copolymerize the material so that it can be thermoformed at high temperatures. The lightweight tube for motorcycles with excellent air retention properties of the present invention is made by blending a thermoplastic polyamide elastomer with a synthetic resin having higher gas barrier properties, but the blending ratio is polyamide elastomer 50~95
% by weight, preferably 60-90% by weight of the synthetic resin, preferably 5-50% by weight, preferably 10-40% by weight. That is, if the blend ratio of synthetic resin in the tube material is less than 5% by weight, no improvement in air retention can be expected, and if the blend ratio of synthetic resin exceeds 50% by weight, the excellent properties of thermoplastic polyamide elastomer Since adhesion is inhibited by high frequency or heat, problems such as poor adhesion of the valve rubber seat or poor connection of the tube occur during tube molding, as well as poor adhesion of patch rubber when repairing punctures. Such problems arise that are unique to tubes for two-wheeled vehicles. The lightweight tube for motorcycles with excellent air retention properties of the present invention further has a permanent elongation of 40 as specified in JISK6304.
% or less, preferably 30% or less. because,
Comfortable running properties based on excellent flexibility and elasticity are essential for tubes for motorcycles such as the one of the present invention, but as is well known, thermoplastic polyamide elastomers have crystalline polyamide components that form the hard segments. Therefore, on uneven road surfaces, oriented crystallization occurs in some parts due to local expansion and contraction that occurs in the tube while driving, and once oriented crystallization occurs, the elasticity of that part decreases. Therefore, in order to prevent the deterioration of running performance due to oriented crystallization of the tube, the permanent elongation must be 40% or less when measured by the method specified in JISK6304. It is. (Examples) Hereinafter, in order to make it easier to understand the lightweight tube for two-wheeled vehicles with excellent air retention properties of the present invention, the present invention will be explained in detail using Examples, but the present invention is not limited to these Examples. The methods for measuring and evaluating the physical properties of the lightweight tube for two-wheeled vehicles with excellent air retention properties of the present invention are as follows. (1) Air permeability (unit: cc/ cm2・atm・24hr)
Transmittance was measured according to ASTM D1434-82. (2) 100% modulus stress (unit: Kg/cm 2 )
A tensile test was performed according to the method specified in JISK6301-1975, and the load at 100% extension (unit: Kg)
It was calculated from the cross-sectional area of the test piece (unit: cm 2 ) using the following formula. 100% modulus stress =
Load at 100% elongation/cross-sectional area of test piece This 100% modulus stress is an index of the flexibility of the tube, and this value is 150
If it exceeds Kg/ cm2 , the tube will become hard and the running performance will deteriorate significantly. (3) Permanent elongation (unit: %) Measured by the method specified in JISK6304-1982.
Incidentally, this permanent elongation is an index of the elasticity of the tube, and as this value increases, the cushioning properties decrease and the running properties deteriorate. (4) Abrasion resistance (unit: mg) Measured by the method specified in JISK7204. The wear wheel used in the measurement was H-22, and the load was 1000 g.
This abrasion resistance is used as a guideline for evaluating the durability of the tube, and if the amount of wear exceeds 300 mg, the wear resistance will deteriorate due to the wear resistance of the tire during driving, as was the case with conventional butyl rubber and natural rubber latex tubes. The tube is severely damaged by friction and has poor durability. (5) Tube moldability When molding the tube, the adhesion of the valve rubber seat using a high-frequency welder and the jointability of the tube were mainly evaluated, and those that could be processed without any problems were marked as (〇).
Cases in which poor adhesion was observed in either the adhesion of the valve rubber seat or the tube connection were marked (x). (6) Comprehensive evaluation Based on the measurement results of air permeability, 100% modulus stress, permanent elongation, wear resistance, tube moldability, etc., this is a comprehensive evaluation of the suitability of tubes for motorcycles. Those that are suitable are marked as (〇), those that are somewhat suitable are marked as (Δ), and those that are unsuitable are marked as (x). Examples 1 to 3, Comparative Examples 1 to 2 After ring-opening polymerization of lauryl lactam as a polyamide-forming component and polyoxypropylene glycol as a polyether-forming component, a thermoplastic polyamide elastomer was produced by further polycondensation. In this process, thermoplastic polyamide elastomers with various hardnesses were produced by varying the amounts of lauryllactam and polyoxypropylene glycol. Next these thermoplastic polyamide elastomers 70
% by weight and 30% by weight of copolymerized polyester resin (density 1.30, melting point 151℃).
Using a 50φ extruder, extrusion temperature 170-230℃, extrusion amount approx.
A tube with a folded diameter of 27 mm and a thickness of 600 μm was produced by extruding it from an annular die with a lip diameter of 17.2φ under the condition of 22 kg/hr and taking it off at a speed of 11.3 m/min. In addition, the density of the obtained tubes is all 0.96 to 1.01.
It was lightweight at g/ cm3 . The evaluation results of air permeability, 100% modulus stress, permanent elongation, abrasion resistance, tube moldability, etc. for tubes made of blended resins of thermoplastic polyamide elastomers and copolymerized polyester resins with various hardnesses were evaluated in the second section. Shown in the table. From the same table, tubes whose thermoplastic polyamide elastomer hardness was within the range of the present invention had excellent air retention properties, running properties, durability, and tube moldability, and were suitable as tubes for motorcycles.
【表】
実施例４〜７、比較例３〜４
前記実施例２で用いたと同じ熱可塑性ポリアミ
ドエラストマー80重量％と第３表に示す種々の合
成樹脂原料20重量％との混合原料を50φ押出機に
供給し、押出温度170〜200℃、押出量約25Kg／hr
の条件でリツプ径25.5φの環状ダイスから押出し、
約7.5m／minの速度で引取ることによつて折径40
mm、厚さ700μのチユーブを作成した。
また、比較のために上記と同様の熱可塑性ポリ
アミドエラストマー原料を用いて折径40mm、厚さ
700μのチユーブを作成した（比較例３）。
これら実施例及び比較例で得たチユーブについ
て、空気透過率、100％モジユラス応力、永久伸
び、耐摩耗性及びチユーブ成形加工性等の評価結
果を第３表に示した。同表より熱可塑性ポリアミ
ドエラストマーより気体遮断性の優れた合成樹脂
をブレンドしたチユーブは、優れた空気保持性と
走行性、耐久性、チユーブ成形加工性を兼備して
おり、二輪車用チユーブとして好適であつた。[Table] Examples 4 to 7, Comparative Examples 3 to 4 A mixed raw material of 80% by weight of the same thermoplastic polyamide elastomer used in Example 2 and 20% by weight of various synthetic resin raw materials shown in Table 3 was extruded through 50φ. Supply to the machine, extrusion temperature 170-200℃, extrusion amount approximately 25Kg/hr
Extruded from an annular die with a lip diameter of 25.5φ under the conditions of
By pulling at a speed of approximately 7.5m/min, the folding diameter is 40mm.
A tube with a thickness of 700 μm was created. In addition, for comparison, using the same thermoplastic polyamide elastomer raw material as above,
A tube of 700μ was prepared (Comparative Example 3). Table 3 shows the evaluation results of air permeability, 100% modulus stress, permanent elongation, abrasion resistance, tube moldability, etc. for the tubes obtained in these Examples and Comparative Examples. From the same table, tubes made of a blend of synthetic resin with better gas barrier properties than thermoplastic polyamide elastomer have excellent air retention, running properties, durability, and tube moldability, making them suitable as tubes for motorcycles. It was hot.
【表】
実施例８〜11、比較例５〜６
熱可塑性ポリアミドエラストマーとナイロン６
のブレンド比率を変える以外は、前記実施例５と
同様の方法で折径40mm、厚さ700μのチユーブを
作成した。
これら熱可塑性ポリアミドエラストマーとナイ
ロン６のブレンド比率の種々異なるチユーブにつ
いて、空気透過率、100％モジユラス応力、永久
伸び、耐摩耗性及びチユーブ成形加工性等の評価
結果を第４表に示した。同表よりナイロン６のブ
レンド比率が本発明の範囲にあるチユーブは優れ
た空気保持性、走行性、耐久性並びにチユーブ成
形加工性を兼備し、二輪車用チユーブとして好適
であつた。[Table] Examples 8-11, Comparative Examples 5-6 Thermoplastic polyamide elastomer and nylon 6
A tube with a folded diameter of 40 mm and a thickness of 700 μm was prepared in the same manner as in Example 5, except that the blending ratio was changed. Table 4 shows the evaluation results of air permeability, 100% modulus stress, permanent elongation, abrasion resistance, tube moldability, etc. for tubes with various blend ratios of thermoplastic polyamide elastomer and nylon 6. From the same table, tubes with a blend ratio of nylon 6 within the range of the present invention had excellent air retention, running properties, durability, and tube moldability, and were suitable as tubes for motorcycles.
【表】
実施例12〜13、比較例７〜10
熱可塑性ポリアミドエラストマーとエチレン−
ビニルアルコール共重合樹脂のブレンド比率を変
える以外は、前記実施例６と同様の方法で折径40
mm、厚さ700μのチユーブを作成した。
これら熱可塑性ポリアミドエラストマーとエチ
レン−ビニルアルコール共重合樹脂のブレンド比
率の種々異なるチユーブについて、空気透過率、
100％モジユラス応力、永久伸び、耐摩耗性及び
チユーブ成形加工性等の評価結果を第５表に示し
たが、同表よりエチレン−ビニルアルコール共重
合樹脂のブレンド比率及び永久伸びが本発明の範
囲にあるチユーブは優れた空気保持性、走行性、
耐久性並びにチユーブ加工性を兼備し、二輪車用
チユーブとして好適であつた。[Table] Examples 12-13, Comparative Examples 7-10 Thermoplastic polyamide elastomer and ethylene
The same method as in Example 6 was used except for changing the blend ratio of the vinyl alcohol copolymer resin.
A tube with a thickness of 700 μm was created. The air permeability,
The evaluation results of 100% modulus stress, permanent elongation, abrasion resistance, tube moldability, etc. are shown in Table 5, and from the same table, the blend ratio of ethylene-vinyl alcohol copolymer resin and permanent elongation are within the range of the present invention. The tube has excellent air retention, running performance,
It had both durability and tube workability, and was suitable as a tube for two-wheeled vehicles.
【表】
尚、前記実施例４〜13で得られたチユーブを用
いて直径27インチの二輪車用チユーブを作成し、
チユーブ１本当りの重量を市販の同タイプのブチ
ルゴムチユーブと比較した結果、ブチルゴムチユ
ーブの重量約170ｇに対して、本発明の二輪車用
軽量チユーブは約120〜130ｇと極めて軽量で、前
後両輪を合わせると約80〜100ｇもの軽量化が可
能であることが明らかとなつた。
（発明の効果）
以上の如き本発明の二輪車用チユーブは、本質
的に樹脂密度の低い熱可塑性ポリアミドエラスト
マーを主材とし、更に気体遮断性に優れた合成樹
脂を特定割合ブレンドしたものであるため、従来
のブチルゴムあるいは天然ゴムラテツクスチユー
ブに比べてはるかに軽量であると同時に、優れた
空気保持性と走行性と兼備するものである。
また本発明の空気保持性に優れた二輪車用軽量
チユーブは、熱可塑性ポリアミドエラストマー特
有の優れた機械的諸性質と耐摩耗性によつてチユ
ーブの薄肉化による軽量化とコストダウンが可能
であるほか、従来のゴム製チユーブの宿命的な問
題であつた耐熱性、耐寒性、耐老化性、耐オゾン
性等が良好であるため、チユーブの耐用年数が大
幅に伸びるという特筆すべき特徴を有するなど、
二輪車用チユーブとして不可欠の優れた耐久性と
走行性を保持しつつ、更に軽量化と空気保持性の
問題を一挙に解決した点は極めて画期的で、工業
的利用価値の高いものである。[Table] In addition, a tube for a motorcycle with a diameter of 27 inches was created using the tubes obtained in Examples 4 to 13,
As a result of comparing the weight of one tube with a commercially available butyl rubber tube of the same type, it was found that the lightweight tube for motorcycles of the present invention is extremely lightweight at about 120 to 130 g, compared to the weight of a butyl rubber tube of about 170 g. It has become clear that it is possible to reduce the weight by approximately 80 to 100 g. (Effects of the Invention) The tube for motorcycles of the present invention as described above is essentially made of thermoplastic polyamide elastomer with a low resin density as a main material, and is further blended with a specific proportion of a synthetic resin having excellent gas barrier properties. It is much lighter than conventional butyl rubber or natural rubber latex tubes, and at the same time has excellent air retention and runnability. In addition, the lightweight tube for motorcycles with excellent air retention properties of the present invention can reduce weight and cost by making the tube thinner due to the excellent mechanical properties and abrasion resistance unique to thermoplastic polyamide elastomer. , it has good heat resistance, cold resistance, aging resistance, ozone resistance, etc., which were the fateful problems of conventional rubber tubes, and has the remarkable feature of significantly extending the tube's service life. ,
It is extremely innovative in that it maintains the excellent durability and running performance that are essential for motorcycle tubes, while also solving the problems of weight reduction and air retention all at once, and is of high industrial value.
Claims (1)
てなる二輪車用チユーブにおいて、該チユーブが
シヨアーＡ硬度70〜93Hsの熱可塑性ポリアミド
エラストマー50〜95重量％と、前記熱可塑性ポリ
アミドエラストマーより高い気体遮断性を有する
ポリ塩化ビニル系樹脂、ポリ塩化ビニリデン系樹
脂、ポリエステル系樹脂、ポリアミド系樹脂、エ
チレン−ビニルアルコール系共重合樹脂、アクリ
ル系樹脂、ポリウレタン系樹脂及びこれらのエラ
ストマーから選ばれた１種あるいはそれ以上の組
合せからなる合成樹脂５〜50重量％とのブレンド
樹脂よりなり、且つJISK6304に規定する永久伸
びが40％以下であることを特徴とする空気保持性
に優れた二輪車用軽量チユーブ。1. A motorcycle tube mainly made of a thermoplastic polyamide elastomer, in which the tube contains 50 to 95% by weight of a thermoplastic polyamide elastomer with a Shore A hardness of 70 to 93 Hs, and polyvinyl chloride having a higher gas barrier property than the thermoplastic polyamide elastomer. consisting of one or more combinations selected from polyvinylidene chloride resins, polyvinylidene chloride resins, polyester resins, polyamide resins, ethylene-vinyl alcohol copolymer resins, acrylic resins, polyurethane resins, and elastomers thereof. A lightweight tube for two-wheeled vehicles with excellent air retention properties, which is made of a blended resin with 5 to 50% by weight of a synthetic resin and has a permanent elongation of 40% or less as specified in JISK6304.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61303872A JPS63156855A (en) | 1986-12-22 | 1986-12-22 | Light-weight tube for bicycle having excellent air-holding property |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61303872A JPS63156855A (en) | 1986-12-22 | 1986-12-22 | Light-weight tube for bicycle having excellent air-holding property |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63156855A JPS63156855A (en) | 1988-06-29 |
| JPH0319265B2 true JPH0319265B2 (en) | 1991-03-14 |
Family
ID=17926289
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61303872A Granted JPS63156855A (en) | 1986-12-22 | 1986-12-22 | Light-weight tube for bicycle having excellent air-holding property |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63156855A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5521314B2 (en) * | 2008-11-10 | 2014-06-11 | 宇部興産株式会社 | Rubber composition for retread tire and retread tire |
| JP5416539B2 (en) * | 2009-10-14 | 2014-02-12 | 住友ゴム工業株式会社 | Tire / rim assembly |
| US20130059142A1 (en) * | 2010-03-31 | 2013-03-07 | Kolon Industries, Inc. | Film for a tyre inner liner and production method therefor |
| EP2980119A4 (en) | 2013-03-29 | 2016-04-06 | Bridgestone Corp | Tire |
| CN106715596B (en) * | 2014-09-24 | 2019-03-01 | 株式会社普利司通 | Tire |
| WO2016047708A1 (en) * | 2014-09-24 | 2016-03-31 | 株式会社ブリヂストン | Tire |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59109539A (en) * | 1982-12-15 | 1984-06-25 | Bridgestone Corp | Novel polymer alloy |
| JPS6096631A (en) * | 1983-10-31 | 1985-05-30 | Toyoda Gosei Co Ltd | Polyamide-rubber blend composition |
-
1986
- 1986-12-22 JP JP61303872A patent/JPS63156855A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59109539A (en) * | 1982-12-15 | 1984-06-25 | Bridgestone Corp | Novel polymer alloy |
| JPS6096631A (en) * | 1983-10-31 | 1985-05-30 | Toyoda Gosei Co Ltd | Polyamide-rubber blend composition |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63156855A (en) | 1988-06-29 |
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