JP2011102922A - Aerial optical drop cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an aerial optical drop cable that has excellent resistance against a cicada (Cryptotympana facialis) and that facilitates leading-in work. <P>SOLUTION: In the aerial optical drop cable 15 in which a supporting wire 12 and a coated optical fiber 10 are covered with a jacket 13, the jacket 13 contains as a principal component a resin composition in which fatty acid amide and silicone are mixed with rubber or plastic. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an aerial optical drop cable that is used outdoors and serves as a lead-in line drawn from an overhead line to an attachment point at a demand location.

  As a so-called aerial optical drop cable for drawing and wiring to a general subscriber's house from a wiring system cable installed in the aerial, steel wire or FRP (glass fiber reinforced plastic), etc. on both sides or one side of the single-core optical fiber There is known a structure in which tensile strength members are arranged, these are collectively covered with a resin such as low-density polyethylene or vinyl chloride, and such a cable is further integrated along a support line (Patent Document 1).

JP 2001-337255 A

  However, the aerial optical drop cable covered with the above-described low density polyethylene has a problem that the coefficient of friction on the cable surface is large, and the bearfish stops on the cable and lays eggs. In recent years, mainly in western Japan, the laying tube of the bearfish penetrates the cable, and damage that damages the optical fiber core wire has frequently occurred.

  Further, when low density polyethylene or the like is used for the coating, since the friction coefficient is large, slipping during the laying (pulling) operation is bad, and there is a possibility that the optical fiber core wire is loaded and transmission characteristics are deteriorated.

  Therefore, the object of the present invention is to solve the above-mentioned problems, impart lubricity to the cable surface, make it difficult for the bear jizz to stop at the foot, suppress egg laying activity, and slide the egg laying tube on the cable surface. It is an object of the present invention to provide an aerial optical drop cable that prevents intrusion and facilitates pull-in work by reducing the dynamic friction coefficient. Furthermore, the present invention provides a non-halogen overhead optical drop cable having these functions while maintaining the conventional flame retardancy.

The present invention was devised to achieve the above object, and in an aerial optical drop cable in which a support wire and an optical fiber core wire are covered with a covering,
The cover is an aerial optical drop cable mainly composed of a resin composition obtained by mixing a fatty acid amide and silicone with rubber or plastic.

  The resin composition may be formed by mixing 0.1 to 10 parts by mass of fatty acid amide and 0.1 to 10 parts by mass of silicone with respect to 100 parts by mass of rubber or plastic.

  The resin composition may contain 10 to 200 parts by mass of a non-halogen flame retardant with respect to 100 parts by mass of rubber or plastic.

  The dynamic friction coefficient based on JIS K 7125 is good to be less than 0.5.

  According to the present invention, since the coefficient of dynamic friction of the covering is small, even if the bearfish stops, it becomes difficult to stop by sliding the foot, and even if it stops, the eggplant of the bearfish slides on the cable surface, It is possible to provide an aerial optical drop cable that is superior in resistance to invasion to prevent intrusion and that can be easily pulled in. In addition, a non-halogen overhead optical drop cable having these functions can be obtained while maintaining the conventional flame retardancy.

It is sectional drawing of the aerial optical drop cable which concerns on one Embodiment of this invention.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a preferred embodiment of the invention will be described with reference to the accompanying drawings.

  First, as shown in FIG. 1, the aerial optical drop cable 15 is formed by covering a support wire 12 and an optical fiber core wire 10 with a covering body 13, and tensile strength members 11 are arranged above and below the optical fiber core wire 10. The support line 12 is arranged on the tensile body 11 at the upper part.

  The covering 13 is formed by extrusion coating a resin composition to be described later, and has a support wire covering portion 13 a that covers the support wire 12, a tensile body 11, and a substantially cross-sectional shape that covers the optical fiber core wire 10. An optical fiber core wire covering portion 13b, a support wire covering portion 13a, and a neck portion 13c connecting the optical fiber core wire covering portion 13b, are drawn out on both sides of the optical fiber core wire covering portion 13b. A cutout portion 14 is formed.

  Now, the resin composition of the covering 13 of the aerial optical drop cable 15 according to the present embodiment contains a fatty acid amide and silicone (silicone compound) in a base polymer made of rubber or plastic so as to reduce the dynamic friction coefficient. It is what I did.

  As the rubber / plastic used as the base polymer, any polymer that does not contain a halogen substance in the polymer can be used. Examples of the rubber material include natural rubber, styrene butadiene rubber, butadiene acrylonitrile copolymer, ethylene / propylene / diene terpolymer, and silicone rubber. Plastic materials include high, medium, and low density polyethylene, polypropylene, ethylene / propylene copolymer, ethylene / methyl acrylate copolymer, ethylene / ethyl acrylate copolymer, linear low density polyethylene, ultra-low density polyethylene, and ethylene / vinyl acetate copolymer. , Ethylene / butene copolymer, ethylene / methyl methacrylate copolymer, ethylene / octene copolymer, polyurethane, polyamide, polyamideimide, polyamide elastomer, polycarbonate, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethersulfone, polyphenylene sulfide, polyphenylenesulfone, polysulfone , Acrylonitrile butadiene styrene terpolymer, methacrylate Diene-styrene terpolymer, a methacrylic-styrene copolymers, styrene-acrylonitrile copolymer, oxybenzoyl polyester, polyacetal, methacrylic resin, unsaturated polyester resin, and silicone resins. The base polymer may be a modified one of these, and a plurality of combinations can be used as necessary. As the base polymer, a cured resin using energy rays such as ultraviolet rays and electron beams can also be used.

  The fatty acid amide is at least one selected from the group consisting of stearoamide, erucic acid amide, oleic acid amide, behenic acid amide, ethylene bis stearamide, oleyl palmamide amide, stearyl erucamide, stearyl oleyl amide, and oleic acid bisamide. Alternatively, it is preferable to use a mixture of two or more.

  In this invention, the addition amount of fatty acid amide is 0.1-10 mass parts with respect to 100 mass parts of base polymers, and the range of 0.3-1 mass part is more preferable. If the amount of fatty acid amide added is less than 0.1 parts by mass, the amount of fatty acid amide to bleed is small and the coefficient of dynamic friction is not sufficiently reduced, so that the egg-laying activity of the bearfish cannot be hindered. If it exceeds 10 parts by mass, the amount of fatty acid amide that bleeds will increase, resulting in increased stickiness and a higher coefficient of dynamic friction. A problem occurs in workability.

  As silicone, organopolysiloxane or a blend of organopolysiloxane and polyolefin can be used.

  In this invention, the addition amount of silicone is 0.1-10 mass parts with respect to 100 mass parts of base polymers. If the amount is less than 0.1 parts by mass, the additive effect cannot be obtained. If the amount is more than 10 parts by mass, the compound slides on the screw when the cable is pushed out and cannot be pushed out well, and the outer shape of the cable is not stable. May cause problems.

  On the other hand, in order to impart flame retardancy, a non-halogen flame retardant can be added to the base polymer as necessary. Examples of the non-halogen flame retardant include magnesium hydroxide, aluminum hydroxide, calcium hydroxide, and metal hydroxides in which nickel is dissolved. A silane coupling agent, a titanate coupling agent, a fatty acid such as stearate or calcium stearate, or a surface treated with a fatty acid metal salt may be used.

  The addition amount of the non-halogen flame retardant added to the base polymer is not particularly specified, but it is preferably adjusted according to the flame retardant level required in the range of 10 to 200 parts by mass with respect to 100 parts by mass of the base polymer. For example, 20-40 mass parts is preferable if it is a pass level of a 60 ° inclined combustion test specified in JIS C 3005, and 150-200 mass parts is preferable if it is a pass level of a vertical combustion test. When the addition amount of the non-halogen flame retardant is less than 10 parts by mass, sufficient flame retardancy cannot be obtained, and when it is more than 200 parts by mass, the mechanical properties are remarkably deteriorated.

  In addition, as a non-halogen flame retardant aid for the base polymer, at least one selected from the group consisting of 1,3,5-triazine derivatives such as melamine, cyanuric acid, isocyanuric acid, melamine cyanurate, melamine sulfate, and red phosphorus, or 2 You may mix seeds or more.

  The operation of the present embodiment will be described.

  In the aerial optical drop cable 15 according to the present embodiment, a resin composition obtained by mixing a fatty acid amide and silicone with rubber or plastic is extrusion coated onto the optical fiber core wire 10 and the support wire 12. A body 13 is formed.

  By adding the fatty acid amide and silicone together, the dynamic friction coefficient of the covering 13 can be made smaller than when adding the fatty acid amide alone or silicone alone, and thereby, the dynamic friction coefficient in accordance with JIS K 7125 is less than 0.5. Can be achieved.

  Since the coefficient of dynamic friction of the covering 13 can be reduced, even if the bearfish stops on the aerial light drop cable 15, it becomes difficult to stop by slipping the foot. It can be slid to prevent the invasion of the oviduct, and can improve the resistance to bear-zemi.

  Further, according to the aerial light drop cable 15, the dynamic friction coefficient of the covering 13 can be reduced, so that the drawing operation becomes easy.

  Furthermore, in the aerial optical drop cable 15, a non-halogen flame retardant is added in the range of 10 to 200 parts by mass with respect to 100 parts by mass of the base polymer, so that sufficient flame retardancy is maintained without deteriorating mechanical properties. it can.

  In addition to the above blending, additives such as lubricants such as other fatty acids, antioxidants, inorganic fillers, stabilizers, carbon black, and colorants can be added as necessary.

  Moreover, the covering body 13 of the aerial optical drop cable 15 according to the present embodiment may have a plurality of layers. In that case, the resin composition according to the present embodiment is used as the outermost layer of the covering body 13. By doing so, it is possible to obtain the effect of anti-coagulation.

  Next, examples of the present invention and comparative examples will be described.

  An aerial optical drop cable 15 shown in FIG. 1 was produced. A single-core ultraviolet curable resin-coated optical fiber core having an outer diameter of 250 μm is used for the optical fiber core 10, and an aramid FRP rod having an outer diameter of 0.5 mm is used for the tensile body 11 of the aerial optical drop cable 15. A single steel wire having an outer diameter of 1.2 mm was used for the support wire 12.

  Various components are blended at the blending ratio shown in Table 1, and after kneading at 200 ° C. with a pressure kneader, the kneaded product is formed into pellets, which are used as a resin composition, and the optical fiber core wire 10 and the two strength members 11 An aerial optical drop cable having an overall width of about 2 mm and a height of about 5 mm is formed by extrusion coating at 180 ° C. in a state where the support wires 12 are arranged in parallel as shown in FIG. 15 (Examples 1-9, Comparative Examples 1-6) were produced.

  In Examples 1 to 9 and Comparative Examples 1 to 6, as the base polymer, high density polyethylene, ethylene butene copolymer (copolymer), ethylene octene copolymer (copolymer), low density polyethylene, ethylene ethyl acrylate, Polybutylene terephthalate was used. Magnesium hydroxide was used as the flame retardant, and red phosphorus and melamine cyanurate were used as the flame retardant aid. As the fatty acid amide, oleic acid bisamide (Sripax O manufactured by Nippon Kasei Co., Ltd.) was used. As the silicone, organopolysiloxane or a blend of organopolysiloxane and polyolefin (organopolysiloxane / polyolefin blend polymer) was used. As the lubricant in the comparative example, stearic acid and zinc stearate were used.

  The evaluation of the overhead optical drop cable was determined by the following method.

(1) Tensile test The prepared pellets were kneaded with a roll, press-molded into a 1 mm sheet, and then subjected to a tensile test according to JIS C 3005. The elongation was 300% or more and the tensile strength was 12 MPa or more.

(2) Dynamic Friction Coefficient Measurement The produced aerial optical drop cable was measured for the dynamic friction coefficient in accordance with JIS K 7125, and the target value was less than 0.5.

(3) Flame retardancy test The produced aerial optical drop cable was subjected to a 60 ° inclined combustion test in accordance with JIS C 3005, the fire spread time after removing the flame was measured, and the fire extinguished naturally within 60 seconds Was passed.

(4) Koma-zemi-resistant judgment test An experiment was conducted in Nishihara-cho, Okinawa, where Kuma-zemi is inhabited. The experiment was performed by preparing a cage of 1 m in length, 1 m in width, and 2 m in height, and releasing 10 female bears in the cage. Inside the cage, the produced aerial optical drop cable is stretched in a lattice pattern. Since adults of Kumaemi are short-lived, a tree preferred by Komazemi was placed in the center of the cage in order to secure sap for food.

  Seven days later, the aerial optical drop cable was taken out and visually observed. If the appearance was damaged, it was rejected (x), and if no damage was observed, it was determined to be acceptable (◯).

  The above evaluation results are also shown in Table 1.

  As shown in Table 1, in Examples 1 to 9, the tensile strength, elongation, and dynamic friction coefficient all satisfy the target values, and all of the 60 ° inclination combustion test and the Kuma-zemi resistance determination test pass and are good. The characteristic was shown.

  In Table 1, when paying attention to the fatty acid amide which is a compounding agent, in Examples 1-9, 0.1-10 mass parts fatty acid amide and 0.1-10 mass parts silicone were added together, It can be seen that the effect of improving the bear-semi property is obtained.

  In Comparative Example 1 in which silicone is outside the specified range and does not contain fatty acid amide, and in Comparative Example 2 and Comparative Example 3 in which silicone and fatty acid amide are not included and other lubricants (stearic acid and zinc stearate) are added, dynamic friction The coefficient was large, and the resistance to kumazemi was insufficient. In Comparative Example 4 in which the fatty acid amide was outside the specified range and no silicone was added, the surface was sticky, the coefficient of dynamic friction was increased, and the resistance to komazemi was insufficient.

  Comparative Example 5 in which the fatty acid amide was added alone and Comparative Example 6 in which the silicone was added alone had a large coefficient of dynamic friction, and the kuma-zemi resistance was rejected.

  From the above results, by adding fatty acid amide and silicone in combination, it is possible to improve the resistance to kuma-zemi than when adding fatty acid amide alone or silicone alone, and the amount of fatty acid amide added to 100 parts by mass of the base polymer. On the other hand, it can be seen that by setting the amount of silicone to 0.1 to 10 parts by mass and 0.1 to 10 parts by mass with respect to 100 parts by mass of the base polymer, it is possible to improve the resistance to coomasemi.

DESCRIPTION OF SYMBOLS 10 Optical fiber core wire 11 Strength member 12 Support line 13 Cover body 14 Notch 15 Overhead optical drop cable

Claims (4)

  In an aerial optical drop cable in which a support wire and an optical fiber core are covered with a covering, the covering is mainly composed of a resin composition in which a fatty acid amide and silicone are mixed with rubber or plastic. An aerial optical drop cable.   The overhead optical drop cable according to claim 1, wherein the resin composition is mixed with 0.1 to 10 parts by mass of fatty acid amide and 0.1 to 10 parts by mass of silicone with respect to 100 parts by mass of rubber or plastic.   The overhead optical drop cable according to claim 1, wherein the resin composition contains 10 to 200 parts by mass of a non-halogen flame retardant with respect to 100 parts by mass of rubber or plastic.   The aerial optical drop cable according to claim 3, wherein a coefficient of dynamic friction according to JIS K 7125 is less than 0.5.

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