JP4082372B2 - 光ファイバケーブル - Google Patents
光ファイバケーブル Download PDFInfo
- Publication number
- JP4082372B2 JP4082372B2 JP2004094047A JP2004094047A JP4082372B2 JP 4082372 B2 JP4082372 B2 JP 4082372B2 JP 2004094047 A JP2004094047 A JP 2004094047A JP 2004094047 A JP2004094047 A JP 2004094047A JP 4082372 B2 JP4082372 B2 JP 4082372B2
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- glass fiber
- resin
- fiber cable
- epoxy resin
- 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
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- 229920006337 unsaturated polyester resin Polymers 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/443—Protective covering
- G02B6/4432—Protective covering with fibre reinforcements
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Description
(1)ガラス繊維の弾性率と含有率をそれぞれEf(GPa)、Vf(%/100)、マトリックス樹脂の弾性率と含有率をそれぞれEm(GPa)、Vm(%/100)、テンションメンバの直径をd(mm)、光ファイバケーブルに使用するテンションメンバの本数をnとしたとき、
(EfVf+EmVm)d2≧8.3/n
(2)(Ef/Em)≧22
(3)Vfは0.6〜0.88
(4)ガラス繊維の破断伸びが5%以上であり、且つマトリックス樹脂の破断伸びが5%以上である。
また、マトリックス樹脂の破断伸びとガラス繊維の破断伸びとの比(マトリックス樹脂の破断伸び/ガラス繊維の破断伸び)が0.93〜1.27であることが好ましい。
また、前記ガラス繊維強化樹脂線状物の最小曲げ直径Dと前記ガラス繊維強化樹脂線状物の直径dの比D/dが20以下であることが好ましい。
εr:引張歪み
L:ファイバ全長
F:破断確率
Np:プルーフ試験時の破断確率
εp:プルーフ歪み
tp:プルーフ時間
m:累積破断分布の傾き
n:疲労係数
予め設定した寿命推定年数及び各種パラメータを用い、本式によって許容される引張歪εrが算出される。実用上光ファイバケーブルを使用する上で、この引張歪εrは0.2%以上であることが従来から要求されており、近年では0.3%以上であることが要求されている。
T=EAεr
で表される。ここでEは引張弾性率、Aはテンションメンバの断面積、εrは上記した許容される引張歪である。
E=EfVf+EmVm
と表される。また、テンションメンバの直径をdとすると、断面積AはA=π(d/2)2であるから、テンションメンバの許容張力Tは
T=(EfVf+EmVm)π(d/2)2εr
となる。
(EfVf+EmVm)d2≧4T´/1.02nπεr
の関係を満たすものである。ここでnは光ファイバケーブルに使用されているテンションメンバの本数である(例えば、ドロップケーブルではn=2)。(EfVf+EmVm)d2は引張歪が0.3、許容張力2.0kgfの場合、8.3/n以上であることが好ましい。引張歪が0.3、許容張力2.6kgfの場合、10.8/n以上であることが好ましい。引張歪が0.2、許容張力2.0kgfの場合、12.5/n以上であることが好ましい。引張歪が0.2、許容張力2.6の場合、16.3/n以上であることが好ましい。なお、テンションメンバの直径dは使用する光ファイバケーブル内に納めることが出来る径を上限とする。住宅やビルの配線用の光ファイバケーブルに使用するものとして、dは0.6mm以下であることが好ましい。
(1)液状エポキシ樹脂
液状エポキシ樹脂は、エポキシシクロヘキサン環又は2,3−エポキシプロピロキシ基(2,3-epoxypropyloxy)を含むことが好ましい。熱カチオン重合触媒を用いる場合には、エポキシシクロヘキサン環を含む液状エポキシ樹脂が特に好ましい。液状エポキシ樹脂が低粘度であるのにもかかわらず、カチオン重合性が高く、硬化後物性が優れているからである。なお、2,3−エポキシプロピロキシ基を含むということは、グリシジルエーテル型エポキシ樹脂ということである。
熱カチオン重合触媒としては、加熱により活性化されエポキシ基の開環を誘発する触媒が用いられ、第四級アンモニウム塩、ホスホニウム塩およびスルホニウム塩等の各種オニウム塩、並びに、有機金属錯体類などが例示される。
(3)酸無水物
酸無水物は、水素添加されていてもよい無水フタル酸骨格を有することが好ましい。酸無水物としては、例えば、無水メチルテトラヒドロフタル酸(Me−THPA)(Quinhard200(日本ゼオン)、HN−2200(日立化成工業)、リカシッドMT−500(新日本理化))、無水メチルヘキサヒドロフタル酸(Me−HHPA)(Quinhard500(日本ゼオン)、HN−5500(日立化成工業)、リカシッドMH−700(新日本理化)),無水メチルナジック酸(25)(MHAC−P(日立化成工業))、無水メチルナジック酸の水素添加物(26)(HNA(新日本理化)),アルキル変性酸無水物(27)(エピキュアYH−306、エピキュアYH−307(ジャパンエポキシレジン))などが挙げられる。
(3)平均分子量900以上のビスフェノールA型エポキシ樹脂
本発明では、マトリックス樹脂は、前記液状エポキシ樹脂を平均分子量900以上のビスフェノールA型エポキシ樹脂と共に硬化させたものであることが好ましい。平均分子量900以上のビスフェノールA型エポキシ樹脂は、一般的には、25℃にて固体である。
例えば、ジャパンエポキシレジンのエピコート1001(平均分子量:900)、エピコート1002(平均分子量:1200)、エピコート1003(平均分子量:1300)、エピコート1055(平均分子量:1600)を用いることができる。未硬化の樹脂組成物の粘度上昇が比較的低く抑えられ、硬化後に充分な靭性を付与しやすいという観点からエピコート1002が望ましい。
(4)可撓性付与剤
可撓性付与剤としては、例えば、カルボン酸末端脂肪族ポリエステルのエポキシ樹脂アダクト物(29)、例えば、SD551(チバ・スペシャルティ・ケミカルズ)を用いることができる。
(5)硬化促進剤
硬化剤として酸無水物を用いた場合には、硬化促進剤を用いることが好ましい。硬化促進剤としては、イミダゾール誘導体を用いることができる。例えば、1−メチルイミダゾール、2−メチルイミダゾール、2−ウンデシルイミダゾール、2−ヘプタデシルイミダゾール等のアルキルイミダゾール;1,2−ジメチルイミダゾール、2−エチル−4−メチルイミダゾール等のジアルキルイミダゾール;2−フェニルイミダゾール等のアリールイミダゾール;2−フェニル−4−メチルイミダゾール、1−ベンジル−2−メチルイミダゾール、1−シアノエチル−2−メチルイミダゾール、1−シアノエチル−2−エチル−4−メチルイミダゾール、1−シアノエチル−2−ウンデシルイミダゾール、1−シアノエチル−2−フェニルイミダゾール、1−シアノエチル−2−エチル−4−メチルイミダゾリウムトリメリテイト、1−シアノエチル−2−ウンデシルイミダゾリウムトリメリテイト、1−シアノエチル−2−フェニルイミダゾリウムトリメリテイト、2,4−ジアミノ−6−(2’−メチルイミダゾリル−(1’))−エチル−s−トリアジン、2,4−ジアミノ−6−(2’−ウンデシルイミダゾリル)−エチル−s−トリアジン、2,4−ジアミノ−6−(2’−エチル−4−メチルイミダゾリル−(1’))−エチル−s−トリアジン、2,4−ジアミノ−6−(2’−メチルイミダゾリル−(1’))−エチル−s−トリアジン イソシアヌル酸付加物、2−フェニルイミダゾール イソシアヌル酸付加物、2−メチルイミダゾール イソシアヌル酸付加物、2−フェニル−4,5−ジヒドロキシメチルイミダゾール、2−フェニル−4−メチル−5−ヒドロキシメチルイミダゾール、1−シアノエチル−2−フェニル−4,5−ジ(2−シアノエトキシ)メチルイミダゾール等を用いることができる。
実施例1〜3
日東紡績(株)から販売されている高強度ガラス繊維(商品名「Tガラス」、破断伸びが5.5%,弾性率が84.3GPa)を用いた。Tガラスは、65重量%のSiO2、23重量%のAl2O3、11重量%のMgO、1重量%未満のZrO2を含む。この高強度ガラス繊維の詳細な仕様を表1に示す。
実施例4及び5
次に、実施例3のマトリックス樹脂とガラス繊維の組み合わせで金型の寸法を変化させ、外径0.42mm(実施例4)と0.51mm(実施例5)のガラス繊維強化樹脂組成物を成形した。実施例1〜3と同様に最小曲げ直径を測定し、最小曲げ直径は、それぞれ7.0mmと9.0mmであり、線状物の直径のそれぞれ16.7倍と17.6倍であった。
実施例6及び7
実施例1〜5と同様に、日東紡績(株)から販売されている高強度ガラス繊維(商品名「Tガラス」、破断伸びが5.5%,弾性率が84.3GPa)を用いた。マトリックス樹脂として、酸無水物によるエポキシ樹脂を用いた。実施例6及び7の配合成分を表5に示す。
比較例
比較例として、破断のびが5%以下のガラス繊維とマトリックス樹脂に熱硬化性ビニルエステル樹脂とを使用し、同様な条件でガラス繊維強化樹脂線状物を成形した。
2 ガラス繊維
3 ヤーン
4 マトリックス樹脂
6 熱可塑性樹脂
10 クリール
11a、11b ガイド
12 含浸槽
13 絞りノズル
14 金型
15 キャタピラ
16 巻き取り装置
21 光ファイバケーブル
22 光ファイバ心線
23 テンションメンバ
24 シース
Claims (7)
- 光ファイバ心線とテンションメンバとを有する光ファイバケーブルにおいて、前記テンションメンバは、破断伸びが5%以上のガラス繊維と硬化する前の25℃における粘度が15000mPa・s以下の液状エポキシ樹脂を熱カチオン重合触媒又は酸無水物により硬化させたマトリックス樹脂とを含むガラス繊維強化樹脂線状物からなり、前記ガラス繊維強化樹脂線状物は以下の条件を満たすことを特徴とする光ファイバケーブル。
(1)ガラス繊維の弾性率と含有率をそれぞれEf(GPa)、Vf(%/100)、マトリックス樹脂の弾性率と含有率をそれぞれEm(GPa)、Vm(%/100)、テンションメンバの直径をd(mm)、光ファイバケーブルに使用するテンションメンバの本数をnとしたとき、
(EfVf+EmVm)d2≧8.3/n
(2)(Ef/Em)≧22
(3)Vfは0.6〜0.88
(4)マトリックス樹脂の破断伸びが5%以上である。 - Emが2GPa以上である請求項1に記載の光ファイバケーブル。
- マトリックス樹脂の破断伸びとガラス繊維の破断伸びとの比(マトリックス樹脂の破断伸び/ガラス繊維の破断伸び)が0.93〜1.27である請求項1または2に記載の光ファイバケーブル。
- 前記ガラス繊維強化樹脂線状物の最小曲げ直径Dと前記ガラス繊維強化樹脂線状物の直径dの比D/dが20以下である請求項1から3のいずれかに記載の光ファイバケーブル。
- dが0.6mm以下である請求項1から4のいずれかに記載の光ファイバケーブル。
- 前記光ファイバ心線の光ファイバはモードフィールド径が8.0〜8.8μmのシングルモードファイバである請求項1から5のいずれかに記載の光ファイバケーブル。
- 前記光ファイバ心線の光ファイバはコアの周囲に複数の空孔を有している請求項1から6のいずれかに記載の光ファイバケーブル。
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US11/085,029 US7171087B2 (en) | 2004-03-29 | 2005-03-21 | Optical fiber cable |
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JP2005283698A (ja) | 2005-10-13 |
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