CN102122050A

CN102122050A - Heat-resisting optical cable

Info

Publication number: CN102122050A
Application number: CN 201010505314
Authority: CN
Inventors: 孙义兴; 张腊生; 谭会良; 许建国; 廖郑洪; 李炳惠; 张华�; 李涛; 陈曲; 谢河彬
Original assignee: Chengdu Hengtong Optical Communication Co Ltd
Current assignee: Chengdu Hengtong Optical Communication Co Ltd
Priority date: 2010-10-13
Filing date: 2010-10-13
Publication date: 2011-07-13

Abstract

The invention relates to a plastic optical fiber cable, in particular to a plastic optical fiber cable which is excellent in heat-resisting performance for a long term at high temperature. A sheath structure of the optical fiber cable consists of a protective coating layer containing an ethylene-vinyl alcohol copolymer and a light shielding coating layer covered outside the protective coating layer, wherein the protective coating layer has the excellent effect of preventing monomers and low polymers which are contained in the light shielding coating layer from being dissolved and diffused in plastic optical fibers (POF).

Description

Heat-resisting optical cable

Technical field

The present invention relates to plastic optical fiber cable, particularly the good plastic optical fiber cable of long-term heat resistance under the hot environment.

Background technology

In the past, as optical fiber, it was main and be practical can carrying out quartz that good light propagates and be optical fiber in very wide wavelength coverage and be with junction line, but this quartz is an optical fiber price height, and processability is low.Therefore, more cheap, light weight, heavy caliber, and the plastic optical fiber (below, slightly be called POF) that has end face processing and handle advantage such as easy is practical in house service purposes fields such as lighting use and sensor applications or FA, OA, LAN.

But because the POF self character, loss increases under hot environment, requires performance so can not satisfy this fully, therefore, need provide a kind of heat-resisting protective especially.

Summary of the invention

In order to solve above-mentioned drawback, the invention provides a kind of heat-resisting optical cable, be characterised in that the light shield clad that it has the plastic optical fiber that comprises core/cladding structure and is located at its periphery, the outermost layer of described core/cladding structure comprises the Fluorine containing olefine based polymer that contains tetrafluoroethylene units at least, described light shield clad is to be the resin of major component with polyamide-based resin, and derives from the monomeric compound and the oligomer compounds of polyamide-based resin among the described resin.

Wherein, has the protection clad between light shield clad and the core in the above-mentioned heat-resisting optical cable; described protection clad is made of ethylene-vinyl alcohol copolymer, and its melt flow index of measuring under 210 ℃, loading 5kgf (49N) condition was at 25～80g/10 minute.

Description of drawings

Fig. 1 is the sectional view of plastic optical fiber cable of the present invention

Embodiment

Below, core, covering, light shield clad, the protection clad that constitutes POF cable of the present invention described successively.

POF cable of the present invention as shown in Figure 1; have plastic optical fiber (POF) 1, be located at its periphery protection clad 2, be located at the light shield clad 3 of its periphery; wherein, plastic optical fiber (POF) 1 comprises core and the covering (core/cladding structure) that is formed at one deck at least of its periphery.Material (core material) as the core that constitutes POF cable of the present invention, there is no particular restriction, but as the POF cable, consider from the angle that satisfies near the long-term heat resistance 100～105 ℃, the multipolymer (below, they are called PMMA is resin) that preferably comprises polymethylmethacrylate (PMMA) or methyl methacrylate (MMA) unit and the vinyl monomer unit more than a kind.Wherein, special preferably clear and the good PMMA of physical strength balance.When core material is the multipolymer of MMA and vinyl monomer, consider that from the angle of guaranteeing the transparency fully the content of MMA unit is preferably more than the 50 quality %, more preferably more than the 60 quality %, further more than the preferred 70 quality %.As copolymer composition corresponding to MMA, can suitably select methacrylate, acrylate etc. as POF with the raw material of core material and at disclosed material before this.

And when the POF cable used under surpassing 105 ℃ hot environment, the resin as transparent height and Tg height, excellent heat resistance also can use polycarbonate-based resin or cyclic polyolefin hydrocarbon system resin as core material.As polycarbonate-based resin or cyclic polyolefin hydrocarbon system resin, can use known material.

The covering that forms in the periphery of core can form 1 layer, also can form the multilayer more than 2 layers.But; consider from the angle that satisfies following each condition; at least need use constituting the unit at the outermost layer of covering and have tetrafluoroethene (TFE) unit at least; the crystallization heat of fusion is the following Fluorine containing olefine based polymer of 59mJ/mg: possess the mechanical property and the thermotolerance that are used for playing as the protective material of core or internal layer covering defencive function; and chemical reagent resistance, excellent impact resistance; and, can fully reduce the low-refraction of light loss when optically crooked.As the Fluorine containing olefine based polymer that contains the TFE unit, can exemplify out the incompatible multipolymer that obtains of at least a kind of copolymerization in TFE unit and vinylidene (VdF) unit, hexafluoropropylene (HFP) unit, perfluor (fluorine) alkyl vinyl ether (FVE) unit, the multipolymer of VdF unit, TFE unit and Hexafluoro acetone unit, the multipolymer of TFE unit, HFP unit and ethylene unit etc., but be not limited thereto.As copolymer composition,, use the transparency angle high, excellent heat resistance of the multipolymer of TFE unit formation to consider preferred especially VdF unit, HFP unit or FVE unit from low cost corresponding to TFE.

And the angle of the excellent in stability during from the melt drawing of POF is considered, preferably contain at least a kind resin in VdF unit and the HFP unit in being contained the Fluorine containing olefine based polymer of TFE unit.

When forming the multilayer covering; resin as the internal layer covering that forms its internal layer side; as the resin that constitutes the protection clad; can be ethylene-vinyl alcohol copolymer; it is the ethylene unit that contains 20～70 moles of %; the multipolymer of 30～80 moles of % vinyl alcohol units; particularly fusing point is below 195 ℃; more preferably in the scope below 180 ℃; at 210 ℃; the multipolymer of the melt flow index of measuring under loading 5kgf (49N) condition in 25～80g/10 minute scope; prevent that not only the monomer that contains in the above-mentioned light shield clad and oligomer from dissolving the excellence of the effect of diffusion in POF, and the forming stability of POF cable is good, therefore preferred.And; the ethylene-vinyl alcohol copolymer multipolymer has high cementability to the polyamide-based resin both of outermost Fluorine containing olefine based copolymer of the covering that forms POF of the present invention and formation light shield clad; so not only can mechanically protect the POF cable, can also suppress the loosening generation under the hot environment.And the oxygen shielding height of this multipolymer is so also can suppress the increase of the loss that caused by the POF oxidative degradation under the hot environment.

In the scope of not damaging as the protection clad of function, can make above-mentioned ethylene-vinyl alcohol copolymer contain other thermoplastic resin, but this moment, the ethylene-vinyl alcohol copolymer multipolymer content in the resin compound is preferably more than the 50 quality %.For example,,, can in the scope of 5～80 mass parts, add polyethylene-based resin or polypropylene-based resin etc. for 100 mass parts ethylene-vinyl alcohol copolymers in order to improve the water vapor shield effectiveness of protection clad, thus preferred.

Thus, under hot environment, avoid loss to increase, satisfy the transmission requirement performance, effectively realize heat-resisting protective.

The invention is not restricted to the foregoing description; in design scope of the present invention; the description of book according to the above description, those of ordinary skill in the art also can make some conspicuous changes, but these changes all should fall within the protection domain of claim of the present invention.

Claims

1. heat-resisting optical cable, be characterised in that it has plastic optical fiber (1) that comprises core/cladding structure and the light shield clad (3) of being located at its periphery, the outermost layer of described core/cladding structure comprises the Fluorine containing olefine based polymer that contains tetrafluoroethylene units at least, described light shield clad (3) is to be the resin of major component with polyamide-based resin, and derives from the monomeric compound and the oligomer compounds of polyamide-based resin among the described resin.

2. heat-resisting optical cable according to claim 1; wherein; has protection clad (2) between described light shield clad (3) and the core; described protection clad (2) is made of ethylene-vinyl alcohol copolymer, and its melt flow index of measuring under 210 ℃, loading 5kgf (49N) condition was at 25～80g/10 minute.