JP3761382B2 - Optical fiber cord and optical fiber cable - Google Patents

Description

表１からも明らかなように、本発明に係る実施例は、いずれも自己消火性を有し、かつ、光ファイバ心線の難燃性ナイロン樹脂被覆の押出加工性や剥取り性も良好で、特に難燃性ナイロン樹脂被覆中の難燃剤の含有量が３０〜４０重量％の実施例３、４、５では、いずれも自己消火時間が６０秒以内と優れた自己消火性を示し、かつ、ナイロン樹脂被覆の押出加工性なども良好であった。これに対し、比較例では、自己消火性とナイロン樹脂被覆の押出加工性および剥取り性をともに満足するものはなかった。
【００４３】
【発明の効果】
以上説明したように、本発明の光ファイバコードによれば、火災時や焼却処理時にハロゲンガスやダイオキシンなどの有害物質を発生することなく自己消火性を具備することができ、しかも、外被の押出加工性や外被除去の際の作業性、可撓性、光ファイバ心線の被覆の押出加工性や剥取り性などが損なわれることもない。
【００４５】
また、本発明の光ファイバケーブルによれば、火災時や焼却処理時にハロゲンガスやダイオキシンなどの有害物質を発生することがなく、また、光ファイバコードは自己消火性を有するため、着火の際の延焼を抑制することができる。
【図面の簡単な説明】
【図１】本発明の光ファイバコードの一実施形態を示す断面図。
【図２】本発明の光ファイバケーブルの他の実施形態を示す断面図。
【図３】本発明の光ファイバコードのさらに他の実施形態を示す断面図。
【図４】本発明の光ファイバケーブルの一実施形態を示す断面図。
【符号の説明】
１………光ファイバ
４………光ファイバ心線被覆
５………抗張力繊維層
６………光ファイバコード外被
７………光ファイバコード
１１………光ファイバケーブル外被[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical fiber cord and an optical fiber cable using such an optical fiber cord.
[0002]
[Prior art]
Conventionally, in an optical device, wiring between devices or between devices has been gathered with tensile strength fibers such as aramid fibers on the outer periphery of an optical fiber core coated with nylon resin, and an outer sheath made of vinyl chloride resin has been provided on the outside. Optical fiber cords and optical fiber cables in which a plurality of such optical fiber cords are gathered around a tension member and a required coating is applied to the outside thereof are used.
[0003]
However, the above optical fiber cord uses vinyl chloride resin for the outer sheath, so it is excellent in flame retardancy, but in the event of fire or incineration, halogen gases and dioxins that are harmful to the environment are generated. There was a problem to do.
[0004]
For this reason, it has been studied to use a non-halogen flame-retardant polyolefin resin as the jacket material instead of the vinyl chloride resin. In other words, this flame retardant polyolefin resin is made by adding a non-halogen flame retardant such as aluminum hydroxide or magnesium hydroxide to a flammable polyolefin resin, and does not contain halogen. There is no risk of generating harmful substances such as dioxins.
[0005]
However, flame retardant polyolefin resin is less flame retardant than vinyl chloride resin, and the tensile strength fiber and nylon resin coating inside the jacket are easy to burn, so the jacket made of vinyl chloride resin is simply made from flame retardant polyolefin resin. It is difficult to provide the flame retardance that conventional optical fiber cords have, simply by replacing the outer sheath. That is, optical fiber cords that are not subjected to the same flame retardant treatment as in the past and whose outer sheath is made of vinyl chloride resin and flame retardant polyolefin resin, respectively, are defined in JIS C 3005. ° Inclined combustion test (supports a sample with a length of about 300 mm, tilted about 60 ° with respect to the horizontal, and makes contact with the tip of the reducing flame at a position about 20 mm from the bottom of the sample until it ignites within 30 seconds, When the flame is removed, the degree of combustion of the sample is investigated). With the conventional optical fiber cord whose outer jacket is made of vinyl chloride resin, the sample does not completely burn, but self-extinguishes. In the case of using the flammable polyolefin resin, the sample did not self-extinguish but burned out.
[0006]
As a countermeasure, increase the amount of flame retardant such as aluminum hydroxide to increase the flame retardancy of the flame retardant polyolefin resin, or increase the thickness of the jacket, Although it is conceivable to prevent the spread of the flame to the inner tensile strength fiber or nylon resin coating, when the amount of flame retardant added is increased, the extrudability decreases as the fluidity of the resin decreases. This causes a problem that the flexibility of the optical fiber cord is reduced. In addition, when the thickness of the outer cover is increased, the degree of adhesion between the outer cover and the tensile strength fiber increases (the outer diameter of the optical fiber cord is specified, so that the wall pressure of the outer cover increases greatly in the center direction). As a result, the outer cover and the tensile fiber are in close contact with each other), so that the workability during the outer cover removal is reduced and the amount of the flame retardant added is increased as in the case of the increase. This causes a problem that the flexibility of the optical fiber cord is reduced.
[0007]
In addition, focusing on the optical fiber core, it may be possible to make the optical fiber core itself flame retardant by adding a flame retardant to the nylon resin. And stripping issues must be considered.
[0008]
[Problems to be solved by the invention]
In this way, it has self-extinguishing properties without generation of dioxins at the time of fire or incineration, extrudability of the outer cover, flexibility and workability when removing the outer cover, and further, nylon resin coating The actual condition is that an optical fiber cord having no practical problem in terms of extrudability and stripping property has not been obtained.
[0009]
Therefore, the present invention has been made in view of such a situation, and has a self-extinguishing property without generating dioxin or the like at the time of fire or incineration, and extrudability and flexibility of the jacket. And an optical fiber cable using such an optical fiber cord, in which there is no practical problem with respect to the workability at the time of removing the outer sheath and the extrudability and stripping property of the nylon resin coating. For the purpose.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the present inventors have conducted intensive research, and as a result, have a jacket made of a halogen-free flame retardant polyolefin resin having an oxygen index of 32 or more and / or a halogen-free flame retardant polyolefin-based thermoplastic elastomer. In addition, it is found that the above-mentioned problems can be solved by coating an optical fiber with a nylon resin and / or a nylon-based thermoplastic elastomer containing 10 to 50% by weight, preferably 30 to 40% by weight of a non-halogen flame retardant. completed.
[0011]
That is, the optical fiber cord of the present invention contains 30 to 40% by weight of non-halogen flame retardant containing at least one non-halogen flame retardant selected from the group of nitrogen flame retardants, phosphorus flame retardants and phosphorus-nitrogen flame retardants. Non-halogen flame retardant polyolefin resin and / or non-halogen flame retardant polyolefin having an oxygen index of 32 or more on the outer periphery of an optical fiber having a coating made of nylon resin and / or nylon thermoplastic elastomer, through a tensile fiber layer It is characterized by comprising a jacket made of a thermoplastic elastomer.
[0012]
Here, the oxygen index is a value measured according to JIS K 7201.
[0013]
In the optical fiber cord having the above-described configuration, a predetermined amount of non-halogen flame retardant is formed in a jacket made of a non-halogen flame retardant polyolefin resin having an oxygen index of 32 or more and / or a non-halogen flame retardant polyolefin thermoplastic elastomer, and an optical fiber core. The coating made of a nylon resin containing a flame retardant and / or a nylon thermoplastic elastomer can provide self-extinguishing properties without generating harmful substances such as halogen gas and dioxin at the time of fire or incineration. In addition, the extrudability of the outer sheath, the workability when removing the outer sheath, the flexibility of the optical fiber cord is also good, and in addition, the amount of the non-halogen flame retardant in the optical fiber core wire has been studied, The extrudability and peelability of the coating made of nylon resin and / or nylon thermoplastic elastomer are also good.
[0014]
In the present invention, the content of the non-halogen flame retardant in the nylon resin and / or the nylon-based thermoplastic elastomer is 30% by weight or more, so that high self-extinguishing properties are achieved , and the content of the non-halogen flame retardant is 40. by having a% by weight or less, it is possible to improve the extrusion workability and stripping of the coating of nylon resin and / or nylon-based thermoplastic elastomer.
[0016]
The optical fiber cable of the present invention is a collection of a plurality of the optical fiber cords of the present invention described above , and the outer periphery thereof is coated with a non-halogen flame retardant polyolefin resin and / or a non-halogen flame retardant polyolefin thermoplastic elastomer. It is characterized by having prepared.
[0017]
In the optical fiber cable of the present invention, in the event of a fire or incineration, no halogen gas or dioxin harmful to the environment is generated, and the optical fiber cord has self-extinguishing properties. It is possible to suppress the spread of fire.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0019]
FIG. 1 is a cross-sectional view showing an embodiment of the optical fiber cord of the present invention.
[0020]
In FIG. 1, 1 is an optical fiber core in which a coating 4 made of a flame-retardant nylon resin and / or a nylon-based thermoplastic elastomer is provided on an optical fiber 2 via a buffer layer 3 made of a silicone resin or the like. Is shown. On the optical fiber core 1, an aramid fiber is vertically attached or twisted to form a tensile strength fiber layer 5. Further, a non-halogen flame retardant polyolefin resin and / or a flame retardant polyolefin is formed thereon. A jacket 6 made of a thermoplastic elastomer is provided.
[0021]
The flame-retardant nylon resin and / or nylon-based thermoplastic elastomer constituting the coating 4 has a non-halogen flame retardant content of 10 to 50% by weight in the nylon resin, nylon-based thermoplastic elastomer, or a mixture thereof. It is blended so that it becomes.
[0022]
Examples of the nylon resin include nylon 12 homopolymer and nylon 12 copolymer, and examples of the nylon-based thermoplastic elastomer include a copolymer of a nylon 12 component and a polyol.
[0023]
Non-halogen flame retardants include nitrogen flame retardants such as guanidine and melamine, phosphorus flame retardants such as ammonium phosphate and red phosphorus, phosphorus-nitrogen flame retardants, metal hydroxides such as magnesium hydroxide and aluminum hydroxide. Products, antimony oxide flame retardants such as molybdenum oxide and antimony trioxide, boric acid compounds such as zinc borate, and calcium carbonate. These may be used alone or in combination of two or more. In the present invention, it is preferable to use at least one selected from a nitrogen-based flame retardant, a phosphorus-based flame retardant, and a phosphorus-nitrogen-based flame retardant. Specifically, Apinone-901 mainly composed of 2-melamine sulfate and MPP-A mainly composed of melamine polyphosphate (all are trade names) manufactured by Sanwa Chemical Co., Ltd. are preferably used. The
[0024]
In the present invention, the content of such a flame retardant is limited to the range of 10 to 50% by weight. If the content is less than 10% by weight, self-extinguishing properties cannot be obtained, and conversely, 50% by weight. It is because the extrudability of a nylon coating and strippability will become inferior when it exceeds%. A more preferable range of the flame retardant content is in the range of 30 to 40% by weight.
[0025]
In such a flame-retardant nylon resin and / or nylon-based thermoplastic elastomer, a pigment, a heat anti-aging agent, an ultraviolet anti-aging agent, and the like that are usually blended in this type of resin as long as the effects of the present invention are not impaired. Other additives may be blended.
[0026]
In addition, the non-halogen flame retardant polyolefin resin and / or non-halogen flame retardant polyolefin thermoplastic elastomer constituting the jacket 6 is blended with a non-halogen flame retardant in the polyolefin resin and / or polyolefin thermoplastic elastomer to obtain an oxygen index. 32 or more is used. If the oxygen index is less than 32, self-extinguishing properties cannot be achieved. If the oxygen index is 32 or more, the types of polyolefin resin, polyolefin-based thermoplastic elastomer, and non-halogen flame retardant are not particularly limited. That is, as the polyolefin resin, low density polyethylene (LDPE), medium density polyethylene polyethylene (MDPE), high density polyethylene (HDPE), very low density polyethylene (VLDPE), linear low density polyethylene (LLDPE), polypropylene, ethylene Propylene copolymer (EP), ethylene / propylene / diene terpolymer (EPDM), polyisobutylene, ethylene / ethyl acrylate copolymer (EEA), ethylene / methyl acrylate copolymer (EMA), ethylene -Ethyl methacrylate copolymer, ethylene-vinyl acetate copolymer (EVA), etc. are mentioned. Moreover, what copolymerized alpha-olefin, cyclic olefins, etc., such as propylene, butene, pentene, hexene, and octene, can be used for the metallocene catalyst. These are used alone or in combination. Examples of non-halogen flame retardants include metal hydroxides such as magnesium hydroxide and aluminum hydroxide, and phosphorus flame retardants such as red phosphorus. One or more of these flame retardants may be appropriately selected and used. Can do.
[0027]
In such a non-halogen flame retardant polyolefin resin and / or a non-halogen flame retardant polyolefin-based thermoplastic elastomer, a pigment, a heat aging inhibitor, and the like that are usually blended in this type of resin within a range not impairing the effects of the present invention, An ultraviolet aging inhibitor and other additives may be blended.
[0028]
Specifically, as non-halogen flame retardant polyolefin resin and / or non-halogen flame retardant polyolefin-based thermoplastic elastomer, JPO's CA1153 (oxygen index 32), CA1155 (oxygen index 36), Nippon Unicar Co., Ltd. It is possible to use NUC-9739 (oxygen index 36), WFR-331 (oxygen index 35), ANA 9982N (oxygen index 39), ANA 9967P (oxygen index 42) (all are trade names) manufactured by Riken Vinyl Co., Ltd. it can.
[0029]
Since the optical fiber cord configured as described above does not contain halogen, it does not generate harmful substances such as halogen gas and dioxin at the time of fire or incineration, and has self-extinguishing properties. That is, when the 60 ° inclined combustion test specified in JIS C 3005 is performed, a sample having a length of about 300 mm is self-extinguished without being completely burned. Moreover, the extrudability and exfoliation property of the coating 4 are good, and the extrudability and flexibility of the jacket 6 are also good.
[0030]
The example described above is an example in which the optical fiber cord of the present invention is applied to a so-called single-core optical fiber cord, but the present invention is not limited to such an example. For example, FIG. As shown, two optical fiber cores 1 are juxtaposed in parallel, a tensile fiber layer 5 is provided on each outer periphery, and a so-called two-fiber flat optical fiber cord having a flat outer jacket 6 is provided outside of them. Also, as shown in FIG. 3, a so-called two-core round type optical fiber cord in which a tensile fiber layer 5 is provided on the outer periphery of the two optical fiber cores 1 and a common jacket 6 is provided in a circular cross section on the outer layer. Needless to say, it can be applied to fire and incineration, and does not generate toxic substances such as halogen gas or dioxin, and has self-extinguishing properties, and is an optical fiber core coating extrusion process. Good peelability In addition, an optical fiber cord having good extrudability and flexibility of the outer sheath of the optical fiber cord can be obtained.
[0031]
Next, an embodiment of the optical fiber cable of the present invention using such an optical fiber cord will be described.
[0032]
FIG. 4 is a cross-sectional view showing an embodiment of the optical fiber cable of the present invention.
[0033]
As shown in FIG. 4, this optical fiber cable is composed of a plurality of optical fiber cords 7 shown in FIG. 1 (six in the example of the drawing), FRP (glass fiber reinforced plastic), polyethylene coated single steel wire, and the like. The member 8 is assembled around the member 8, and a buffer layer 9 made of an intervening string such as a polypropylene string and a presser wound layer 10 made of a non-halogen flame-retardant press-wrapping tape are sequentially applied to the outer periphery of the member 8 and further non-halogen flame-retardant thereon. The outer cover 11 made of a polyolefin resin is covered.
[0034]
The type of the non-halogen flame retardant polyolefin resin constituting the jacket 11 is not particularly limited, but from the viewpoint of flame retardancy, the oxygen index as used in the jacket 6 of the optical fiber cord 7 is 32. It is preferable to use the above.
[0035]
The optical fiber cable constructed as described above does not contain halogen, so that no harmful substances such as halogen gas and dioxin are generated during a fire or incineration, and the optical fiber cord 7 is self-extinguishing. Therefore, it is possible to suppress the spread of fire during ignition.
[0036]
【Example】
EXAMPLES Next, although an Example demonstrates this invention further more concretely, this invention is not limited to these Examples.
[0037]
Example 1
A multi-mode optical fiber having a core diameter of 50 μm and a cladding diameter of 125 μm is coated with a silicone resin, and on top of that, a nylon resin (trade name L1940, manufactured by Daicel Huls Co., Ltd.) and nitrogen-based flame retardant Apinon-901 are blended. The obtained flame retardant nylon resin (a flame retardant content of 10% by weight) was coated to a thickness of 0.25 mm to obtain an optical fiber core having an outer diameter of 0.9 mm. While aramid fiber (trade name Kevlar) is vertically attached to the optical fiber core, a flame retardant polyolefin resin having an oxygen index of 32 (trade name CA1153BM manufactured by JPO) is coated on the outer periphery thereof to a thickness of 0.6 mm. An optical fiber cord with an outer diameter of 2.8 mm was obtained.
[0038]
The obtained optical fiber cord was subjected to a 60 ° inclined combustion test stipulated in JIS C 3005, and the time until ignition after ignition (flame contact time 15 seconds) was measured to evaluate self-extinguishing properties. Further, the extrudability of the flame retardant nylon resin coating of the optical fiber core wire was evaluated by the appearance of the coating, and the stripping property was evaluated by the occurrence of necking when the coating was stripped by the wire stripper. These results are shown in Table 1.
[0039]
Examples 2-7
Optical fiber in the same manner as in Example 1 except that the content of the flame retardant in the flame retardant nylon resin is 15% by weight, 30% by weight, 35% by weight, 40% by weight, 45% by weight, and 50% by weight. An optical fiber cord was obtained in the same manner as in Example 1 using each optical fiber core wire.
[0040]
Each of these optical fiber cords was evaluated in the same manner as in Example 1. These results are shown in Table 1.
[0041]
In the table, as comparative examples, the example in which the flame retardant is not blended with the nylon resin (Comparative Example 1), the example in which the flame retardant is blended in an insufficient amount with respect to the nylon resin (Comparative Example 2), and the nylon resin are shown. Example (Comparative Example 3) in which a flame retardant is excessively blended with respect to nylon, a flame retardant polyolefin compound (product name CA1152 manufactured by JPO Co., Ltd.) having an oxygen index of 30 and an oxygen index of 30 is used as a jacket material. The example used (Comparative Example 4) and the example in which the flame retardant was excessively blended with the nylon resin and the flame retardant polyolefin resin having an oxygen index of 30 similar to that in Comparative Example 4 was used as the jacket material (Comparative Example 5) These are all shown for comparison with the present invention.
[0042]
[Table 1]

As is clear from Table 1, all of the examples according to the present invention have self-extinguishing properties, and the extrudability and exfoliation property of the flame retardant nylon resin coating of the optical fiber core wire are also good. In Examples 3 , 4 , and 5 in which the content of the flame retardant in the flame retardant nylon resin coating is 30 to 40% by weight, the self-extinguishing time is within 60 seconds, and excellent self-extinguishing properties are exhibited. The extrusion processability of the nylon resin coating was also good. On the other hand, none of the comparative examples satisfied both the self-extinguishing property and the extrusion processability and stripping property of the nylon resin coating.
[0043]
【The invention's effect】
As described above, according to the optical fiber cord of the present invention, self-extinguishing can be achieved without generating harmful substances such as halogen gas and dioxin at the time of fire or incineration, Extrudability, workability at the time of outer sheath removal, flexibility, extrudability and stripping property of the coating of the optical fiber core are not impaired.
[0045]
In addition, according to the optical fiber cable of the present invention, no harmful substances such as halogen gas and dioxin are generated during a fire or incineration, and the optical fiber cord has a self-extinguishing property. Fire spread can be suppressed.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of an optical fiber cord of the present invention.
FIG. 2 is a cross-sectional view showing another embodiment of the optical fiber cable of the present invention.
FIG. 3 is a cross-sectional view showing still another embodiment of the optical fiber cord of the present invention.
FIG. 4 is a cross-sectional view showing an embodiment of the optical fiber cable of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Optical fiber 4 ... Optical fiber core coating 5 ... Strength fiber layer 6 ... Optical fiber cord jacket 7 ... Optical fiber cord 11 ... Optical fiber cable jacket

Claims (2)

Non-halogen flame retardant nylon resin and / or nylon thermoplastic elastomer containing 30 to 40% by weight of at least one non-halogen flame retardant selected from the group of nitrogen flame retardants, phosphorus flame retardants and phosphorus-nitrogen flame retardants An outer sheath made of a non-halogen flame retardant polyolefin resin having an oxygen index of 32 or more and / or a non-halogen flame retardant polyolefin thermoplastic elastomer is provided on the outer periphery of an optical fiber core having a coating made of An optical fiber cord characterized by comprising An optical fiber cable comprising a plurality of optical fiber cords according to claim 1 and a jacket made of a non-halogen flame-retardant polyolefin resin and / or a non-halogen flame-retardant polyolefin-based thermoplastic elastomer on the outer periphery thereof. .

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