CN107894640A - One kind limits Fracture Force and makes somebody a mere figurehead leading in cable - Google Patents
One kind limits Fracture Force and makes somebody a mere figurehead leading in cable Download PDFInfo
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- CN107894640A CN107894640A CN201711458815.4A CN201711458815A CN107894640A CN 107894640 A CN107894640 A CN 107894640A CN 201711458815 A CN201711458815 A CN 201711458815A CN 107894640 A CN107894640 A CN 107894640A
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- cable
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- polysiloxane
- mere figurehead
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Classifications
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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
-
- 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
- G02B6/4436—Heat resistant
Abstract
Fracture Force is limited the invention discloses one kind and makes somebody a mere figurehead leading in cable, and it includes light unit, and light unit periphery is coated with waterstop, and waterstop periphery is coated with fire-resistant film, and fire-resistant film periphery is coated with flame retardant coating, and flame retardant coating periphery is coated with PE oversheaths；By weight, the formula of fire-resistant film includes：50 70 parts of epoxy resin, 0 50 parts of kymene, 5 10 parts of nanometric magnesium hydroxide, 0.5 2 parts of polysiloxane-grafted CNT, 35 parts of organo montmorillonite；The particle diameter of nanometric magnesium hydroxide is 0.1 1 μm, and the length of polysiloxane-grafted CNT is 2 20 μm；The mass fraction of montmorillonite is 96% 98% in organo montmorillonite, and granularity be 300 500 mesh, and radius-thickness ratio is 200 300.Optical cable has higher mechanical performance and environmental performance, and optical cable overall dimensions are small, can also solve conventional cable external diameter it is thick, from the problems such as great, construction is inconvenient.
Description
Technical field
The present invention relates to the communications field, and in particular to one kind limits Fracture Force and makes somebody a mere figurehead leading in cable.
Background technology
It is a kind of optical cable that disclosure satisfy that optical cable security performance to limit Fracture Force and make somebody a mere figurehead leading in cable, so-called restriction Fracture Force
Refer to optical cable when bearing specified range pulling force, it is possible to achieve optical cable is broken safely, prevents the destruction to surrounding enviroment, optical cable
Ultra-violet curing light unit is used in production process, production efficiency is high, and light unit size small capital optical cable is by using water blocking material
Material, dry type stop water can be achieved.
Layer-twisted type makes somebody a mere figurehead leading in cable typically by cable core, and reinforcer, sheath composition, wherein cable core is strengthened with a center
Part, more Loose tubes are twisted with S-Z or spiral stranded mode is arranged in center reinforcemen periphery and formed, and uniformly parcel is more outside cable core
Root aramid fiber finally extrudes a floor height density PE sheath materials as reinforcer.Scene, light are introduced suitable for aerial introducing or pipeline
Cable processing technology is more complicated, need to pass through multiple working procedure and produce, and has higher disrumpent feelings force value, in actual use,
Situations such as optical cable scratches with vehicle or building machinery such as occurs, because the disrumpent feelings force value of optical cable is excessive, optical cable tower bar can be caused by light
Cable, which pulls to tilt, even to collapse, and so as to be damaged to periphery personnel, vehicle, building etc., causes security incident.
Also, the fire resistance of optical cable is also always the key character for evaluating properties of optical fiber cable, aerial leading in cable is improved
Environmental performance and high flame retardant.
The content of the invention
Fracture Force is limited the technical problem to be solved in the present invention is to provide one kind and makes somebody a mere figurehead leading in cable, and optical cable has higher
Mechanical performance and environmental performance, and optical cable overall dimensions are small, can also solve conventional cable external diameter slightly, from great, construction not
Just the problems such as.
In order to solve the above-mentioned technical problem, limit Fracture Force the invention provides one kind and make somebody a mere figurehead leading in cable, it includes light
Unit, the light unit periphery are coated with waterstop, and the waterstop periphery is coated with fire-resistant film, the fire-resistant film periphery
Flame retardant coating is coated with, the flame retardant coating periphery is coated with PE oversheaths；
By weight, the formula of the fire-resistant film includes：Epoxy resin 50-70 parts, kymene 0-50 parts, receive
Meter level magnesium hydroxide 5-10 parts, polysiloxane-grafted CNT 0.5-2 parts, organo montmorillonite 3-5 parts；
The particle diameter of the nanometric magnesium hydroxide is 0.1-1 μm, and the length of the polysiloxane-grafted CNT is 2-
20μm；The mass fraction of montmorillonite is 96%-98% in the organo montmorillonite, and granularity is 300-500 mesh, radius-thickness ratio 200-
300。
Preferably, the fire-resistant film is prepared through the steps：The polysiloxanes for weighing formula ratio connects
Branch CNT, is dissolved in N-N dimethyl formamide solutions, stirring 30-60min while ultrasonic disperse, obtains homogeneous mixing
Solution, wherein the mass ratio of polysiloxane-grafted CNT and N-N dimethyl formamide solutions is 1：100；Then to mixing
Nanometric magnesium hydroxide, stirring 30-60min while ultrasonic disperse are added in solution；Then epoxy resin is added, is stirred at 80 DEG C
1-2 hours are mixed, are completely dissolved to epoxy resin；Organo montmorillonite and polyamide are subsequently added into, continues to stir 1-2 hours, it is extremely poly-
Acid amides is completely dissolved；Then mixed solution is transferred in Teflon mould, then Teflon mould is put into 80 DEG C
In baking oven, treat that solvent volatilizees, you can obtain the fire-resistant film.
Preferably, the polysiloxane-grafted CNT is prepared by the steps：
Multi-walled carbon nanotube is taken, is added in the mixed liquor of sulfuric acid and nitric acid, wherein the volume ratio of sulfuric acid and nitric acid is 3：
1；At least 6h is reacted at 60-65 DEG C, after filtering and alcohol is washed repeatedly, 4-6h is dried in vacuo at 80 DEG C, obtains being acidified more walls
CNT；Then take 100mg to be acidified multi-walled carbon nanotube, be added in 20ml tetrahydrofurans, ultrasonic disperse stirs simultaneously；Connect
Addition 15-20mg dicyclohexylcarbodiimides and 80-90mg dimethyl silicone polymers, 80 DEG C is warming up to, stirs simultaneously；Reaction
After 24 hours, product washs through methanol, DMF successively, and then again through 0.22 Mm filter membrane filtration, filtration product is true at 60 DEG C
Sky is dried, and obtains polysiloxane-grafted CNT.
Preferably, the flame retardant coating is can porcelain macromolecule flame retardant coating.
Preferably, in addition to FRP reinforcers, the FRP reinforcers are arranged on the both sides of the light unit.
Preferably, the light unit includes some optical unit tubes, and some optical fiber are provided with the optical unit tubes.
Preferably, water blocking yarn is provided between the optical unit tubes.
Preferably, the external diameter of leading in cable is 7.0mm.
The technique effect of the present invention：
1st, the present invention is simple in construction, in light weight, easy for construction quick, and cable outer diameter is small (to can be achieved 36 core fibres, outside optical cable
Footpath is 7.0mm), influenceed in aerial laying by external diameter environment also just small, i.e., suffered load is small, therefore is meeting identical laying
Under environment, designed by mechanics, non-metallic fibers reinforcement material can be saved, reduce cost.
2nd, the present invention is designed using parallel reinforcement structure, and FRP is as main load original paper, it is possible to reduce the receipts of sheath
Contracting, improve the environmental performance of optical cable.
3rd, the present invention uses high density material PE, not only resistance to compression but also wear-resisting, the aerial laying at the beginning of being designed except satisfaction
Outside it is required that, also meet that pipeline introduces, greatly strengthen the application environment of optical cable.
4th, optical cable of the invention, is provided with fire-resistant film, the formula of the fire-resistant film again on the oversheath of conventional cable
In contain epoxy resin, polyamide, nanometric magnesium hydroxide, polysiloxane-grafted CNT and organo montmorillonite, wherein carbon
The carbon deposit that nanotube, nanometric magnesium hydroxide and organo montmorillonite form network structure in the combustion process of polymer is heat-insulated
Protective layer, fine and close and flawless, hinders the transmission of heat and quality；The generation of water is often accompanied by into charcoal process, can be diluted
Gaseous fuel, reduce burn rate；Carbon deposit heat-barrier coating can protect lower floor's composite as the barrier of heat transfer in itself；
It is typically the endothermic reaction into charcoal process, advantageously reduces the temperature of surrounding environment, so as to enhances the anti-flammability of polymer；Its
Secondary, CNT has big specific surface area, the good scattered and interaction force with matrix, is favorably improved matrix material
The heat endurance of material and the heat decomposition temperature of matrix material, enhance its fire-retardant performance；Again, CNT and nanoscale hydrogen
Both Nano fillings of magnesia, form network structure in combustion, have obstructed the transmission of gas, so as to improve high score
The fire resistance of sub- material.
Brief description of the drawings
Fig. 1 is structural representation；
Label declaration in figure：
1- light units, 2- waterstops, 3- fire-resistant films, 4- flame retardant coatings, 5-PE oversheaths, 6-FRP reinforcers, 101- light lists
Member pipe, 102- optical fiber, 103- water blocking yarns.
Embodiment
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings, so that those skilled in the art can be with
More fully understand the present invention and can be practiced, but illustrated embodiment is not as a limitation of the invention.
Embodiment 1
A kind of restriction Fracture Force of the present invention makes somebody a mere figurehead the embodiment of leading in cable, as shown in figure 1, it includes light unit 1, institute
State the periphery of light unit 1 and be coated with waterstop 2, the periphery of waterstop 2 is coated with fire-resistant film 3, the periphery of fire-resistant film 3 bag
Flame retardant coating 4 is covered with, the periphery of flame retardant coating 4 is coated with PE oversheaths 5.
In the present embodiment, the flame retardant coating is can porcelain macromolecule flame retardant coating.
FRP reinforcers 6 are also provided with, the FRP reinforcers 6 are arranged on the both sides of the light unit 1.
The light unit 1 includes some optical unit tubes 101, and some optical fiber 102 are provided with the optical unit tubes 101.It is described
Water blocking yarn 103 is provided between optical unit tubes 101.
The external diameter of leading in cable is 7.0mm.
Said structure is simple, in light weight, easy for construction quick, and its external diameter is small (to can be achieved 36 core fibres, cable outer diameter is
7.0mm), influenceed in aerial laying by external diameter environment also just small, i.e., suffered load is small, therefore is meeting identical laying environment
Under, designed by mechanics, non-metallic fibers reinforcement material can be saved, reduce cost.
Designed using parallel reinforcement structure, FRP is as main load original paper, it is possible to reduce the contraction of sheath, improve
The environmental performance of optical cable.Using high density material PE, not only resistance to compression but also wear-resisting, except meeting that the aerial laying at the beginning of designing will
Outside asking, also meet that pipeline introduces, greatly strengthen the application environment of optical cable.
In the present embodiment, the formula of fire-resistant film includes：60 parts of epoxy resin, 0 part of kymene, nanoscale hydroxide
5 parts of magnesium, 2 parts of polysiloxane-grafted CNT, 3 parts of organo montmorillonite；Wherein, the particle diameter of nanometric magnesium hydroxide is 0.1-1 μ
M, the length of polysiloxane-grafted CNT is 2-20 μm；The mass fraction of montmorillonite is 96%-98% in organo montmorillonite,
Granularity is 300-500 mesh, radius-thickness ratio 200-300.
Fire-resistant film is prepared through the steps：The polysiloxane-grafted CNT of formula ratio is weighed,
It is dissolved in N-N dimethyl formamide solutions, stirring 60min while ultrasonic disperse, homogeneous mixed solution is obtained, wherein poly- silica
The mass ratio of alkane grafting carbon nanotube and N-N dimethyl formamide solutions is 1：100；Then nanoscale is added into mixed solution
Magnesium hydroxide, stirring 60min while ultrasonic disperse；Then epoxy resin is added, is stirred 1 hour at 80 DEG C, to epoxy resin
It is completely dissolved；Organo montmorillonite and polyamide are subsequently added into, continues stirring 1 hour, is completely dissolved to polyamide；Then will mixing
Solution is transferred in Teflon mould, then Teflon mould is put into 80 DEG C of baking ovens, treats that solvent volatilizees, you can
To the fire-resistant film.
Wherein, polysiloxane-grafted CNT is prepared by the steps：Multi-walled carbon nanotube is taken, is added
Into the mixed liquor of sulfuric acid and nitric acid, wherein the volume ratio of sulfuric acid and nitric acid is 3：1；At least 6h is reacted at 65 DEG C, through filtering
After being washed repeatedly with alcohol, 6h is dried in vacuo at 80 DEG C, obtains being acidified multi-walled carbon nanotube；Then take 100mg to be acidified more wall carbon to receive
Mitron, it is added in 20ml tetrahydrofurans, ultrasonic disperse stirs simultaneously；It is subsequently added into 18mg dicyclohexylcarbodiimides and 85mg
Dimethyl silicone polymer, 80 DEG C are warming up to, is stirred simultaneously；After reaction 24 hours, product washs through methanol, DMF successively, then again
Through 0.22 Mm filter membrane filtration, filtration product is dried in vacuo at 60 DEG C, obtains polysiloxane-grafted CNT.
Embodiment 2
In the present embodiment, the formula of fire-resistant film includes：50 parts of epoxy resin, 5 parts of kymene, nanoscale hydroxide
9.5 parts of magnesium, 0.5 part of polysiloxane-grafted CNT, 5 parts of organo montmorillonite；Wherein, the particle diameter of nanometric magnesium hydroxide is
0.1-1 μm, the length of polysiloxane-grafted CNT is 2-20 μm；The mass fraction of montmorillonite is in organo montmorillonite
96%-98%, granularity are 300-500 mesh, radius-thickness ratio 200-300.
Fire-resistant film is prepared through the steps：The polysiloxane-grafted CNT of formula ratio is weighed,
It is dissolved in N-N dimethyl formamide solutions, stirring 30min while ultrasonic disperse, homogeneous mixed solution is obtained, wherein poly- silica
The mass ratio of alkane grafting carbon nanotube and N-N dimethyl formamide solutions is 1：100；Then nanoscale is added into mixed solution
Magnesium hydroxide, stirring 30min while ultrasonic disperse；Then epoxy resin is added, is stirred 2 hours at 80 DEG C, to epoxy resin
It is completely dissolved；Organo montmorillonite and polyamide are subsequently added into, continues stirring 2 hours, is completely dissolved to polyamide；Then will mixing
Solution is transferred in Teflon mould, then Teflon mould is put into 80 DEG C of baking ovens, treats that solvent volatilizees, you can
To the fire-resistant film.
Wherein, polysiloxane-grafted CNT is prepared by the steps：Multi-walled carbon nanotube is taken, is added
Into the mixed liquor of sulfuric acid and nitric acid, wherein the volume ratio of sulfuric acid and nitric acid is 3：1；At least 6h is reacted at 60 DEG C, through filtering
After being washed repeatedly with alcohol, 4h is dried in vacuo at 80 DEG C, obtains being acidified multi-walled carbon nanotube；Then take 100mg to be acidified more wall carbon to receive
Mitron, it is added in 20ml tetrahydrofurans, ultrasonic disperse stirs simultaneously；It is subsequently added into 20mg dicyclohexylcarbodiimides and 90mg
Dimethyl silicone polymer, 80 DEG C are warming up to, is stirred simultaneously；After reaction 24 hours, product washs through methanol, DMF successively, then again
Through 0.22 Mm filter membrane filtration, filtration product is dried in vacuo at 60 DEG C, obtains polysiloxane-grafted CNT.
Embodiment 3
In the present embodiment, the formula of fire-resistant film includes：57 parts of epoxy resin, 0 part of kymene, nanoscale hydroxide
8 parts of magnesium, 1 part of polysiloxane-grafted CNT, 4 parts of organo montmorillonite；Wherein, the particle diameter of nanometric magnesium hydroxide is 0.1-1 μ
M, the length of polysiloxane-grafted CNT is 2-20 μm；The mass fraction of montmorillonite is 96%-98% in organo montmorillonite,
Granularity is 300-500 mesh, radius-thickness ratio 200-300.
Fire-resistant film is prepared through the steps：The polysiloxane-grafted CNT of formula ratio is weighed,
It is dissolved in N-N dimethyl formamide solutions, stirring 50min while ultrasonic disperse, homogeneous mixed solution is obtained, wherein poly- silica
The mass ratio of alkane grafting carbon nanotube and N-N dimethyl formamide solutions is 1：100；Then nanoscale is added into mixed solution
Magnesium hydroxide, stirring 50min while ultrasonic disperse；Then epoxy resin is added, is stirred 1.5 hours at 80 DEG C, to asphalt mixtures modified by epoxy resin
Fat is completely dissolved；Organo montmorillonite and polyamide are subsequently added into, continues stirring 1.5 hours, is completely dissolved to polyamide；Then will
Mixed solution is transferred in Teflon mould, then Teflon mould is put into 80 DEG C of baking ovens, treats that solvent volatilizees, i.e.,
It can obtain the fire-resistant film.
Wherein, polysiloxane-grafted CNT is prepared by the steps：Multi-walled carbon nanotube is taken, is added
Into the mixed liquor of sulfuric acid and nitric acid, wherein the volume ratio of sulfuric acid and nitric acid is 3：1；At least 6h is reacted at 60 DEG C, through filtering
After being washed repeatedly with alcohol, 5h is dried in vacuo at 80 DEG C, obtains being acidified multi-walled carbon nanotube；Then take 100mg to be acidified more wall carbon to receive
Mitron, it is added in 20ml tetrahydrofurans, ultrasonic disperse stirs simultaneously；It is subsequently added into 15mg dicyclohexylcarbodiimides and 80mg
Dimethyl silicone polymer, 80 DEG C are warming up to, is stirred simultaneously；After reaction 24 hours, product washs through methanol, DMF successively, then again
Through 0.22 Mm filter membrane filtration, filtration product is dried in vacuo at 60 DEG C, obtains polysiloxane-grafted CNT.
Performance detection
Example 1-3 cable sample, according to national standard GB/T 19216.21 and GB/T 20285 regulation come test light
The fire resistance of cable, the result of its fire resistance is as shown in table 1-3.
The fire resistance parameter list of the optical cable of the embodiment 1 of table 1
The fire resistance parameter list of the optical cable of the embodiment 2 of table 2
The fire resistance parameter list of the optical cable of the embodiment 3 of table 3
As can be seen that the optical cable sample of embodiment 1- embodiments 3, its tolerable temperature is up to 1000 DEG C, flue gas from table 1-3
Toxicity also complies with the requirement of national standard.This shows that embodiment 1-3 optical cable has excellent fire-retardant and fire resistance, wherein embodiment
The fire resistance of 1 optical cable sample is best, is most preferred embodiment.
Compared with common optical cable, embodiment 1-3 optical cable is provided with fire-resistant film on oversheath, the fire-resistant film
Contain epoxy resin, polyamide, nanometric magnesium hydroxide, polysiloxane-grafted CNT and organo montmorillonite in formula, its
Middle CNT, nanometric magnesium hydroxide and organo montmorillonite are respectively provided with fire-retardant function, and this several nano material can produce association
Same fire retarding effect.Particularly, above-mentioned several nano materials can form the carbon deposit of network structure in the combustion process of polymer
Heat-barrier coating, fine and close and flawless, hinders the transmission of heat and quality, so as to enhance the anti-flammability of polymeric matrix；
Secondly, CNT has big specific surface area, the good scattered and interaction force with matrix, is favorably improved matrix
The heat endurance of material and the heat decomposition temperature of matrix material, enhance its fire-retardant performance；Again, CNT and nanoscale
Both Nano fillings of magnesium hydroxide, form network structure in combustion, have obstructed the transmission of gas, so as to improve height
The fire resistance of molecular material.
Embodiment described above is only to absolutely prove preferred embodiment that is of the invention and being lifted, protection model of the invention
Enclose not limited to this.The equivalent substitute or conversion that those skilled in the art are made on the basis of the present invention, in the present invention
Protection domain within.Protection scope of the present invention is defined by claims.
Claims (8)
1. one kind limits Fracture Force and makes somebody a mere figurehead leading in cable, it is characterised in that it includes light unit, and the light unit periphery is coated with
Waterstop, the waterstop periphery are coated with fire-resistant film, and the fire-resistant film periphery is coated with flame retardant coating, outside the flame retardant coating
It is coated with PE oversheaths week；
By weight, the formula of the fire-resistant film includes：Epoxy resin 50-70 parts, kymene 0-50 parts, nanoscale
Magnesium hydroxide 5-10 parts, polysiloxane-grafted CNT 0.5-2 parts, organo montmorillonite 3-5 parts；
The particle diameter of the nanometric magnesium hydroxide is 0.1-1 μm, and the length of the polysiloxane-grafted CNT is 2-20 μm；
The mass fraction of montmorillonite is 96%-98% in the organo montmorillonite, and granularity is 300-500 mesh, radius-thickness ratio 200-300.
2. the as claimed in claim 1 a kind of Fracture Force that limits makes somebody a mere figurehead leading in cable, it is characterised in that the fire-resistant film is
It is prepared through the steps：The polysiloxane-grafted CNT of formula ratio is weighed, it is molten to be dissolved in N-N dimethylformamides
In liquid, stirring 30-60min while ultrasonic disperse, homogeneous mixed solution is obtained, wherein polysiloxane-grafted CNT and N-
The mass ratio of N-dimethylformamide solution is 1：100；Then nanometric magnesium hydroxide is added into mixed solution, stirs 30-
60min while ultrasonic disperse；Then epoxy resin is added, 1-2 hours are stirred at 80 DEG C, are completely dissolved to epoxy resin；Connect
Addition organo montmorillonite and polyamide, continues to stir 1-2 hours, is completely dissolved to polyamide；Then mixed solution is shifted
It is put into Teflon mould, then by Teflon mould in 80 DEG C of baking ovens, treats that solvent volatilizees, you can obtain described resistance to
Fiery film.
3. a kind of Fracture Force that limits as claimed in claim 1 makes somebody a mere figurehead leading in cable, it is characterised in that described polysiloxane-grafted
CNT is prepared by the steps：
Multi-walled carbon nanotube is taken, is added in the mixed liquor of sulfuric acid and nitric acid, wherein the volume ratio of sulfuric acid and nitric acid is 3：1；
At least 6h is reacted at 60-65 DEG C, after filtering and alcohol is washed repeatedly, 4-6h is dried in vacuo at 80 DEG C, obtains being acidified more wall carbon and receive
Mitron；Then take 100mg to be acidified multi-walled carbon nanotube, be added in 20ml tetrahydrofurans, ultrasonic disperse stirs simultaneously；Then plus
Enter 15-20mg dicyclohexylcarbodiimides and 80-90mg dimethyl silicone polymers, be warming up to 80 DEG C, stir simultaneously；It is small to react 24
Shi Hou, product are washed through methanol, DMF successively, and then again through 0.22 Mm filter membrane filtration, filtration product vacuum at 60 DEG C is done
It is dry, obtain polysiloxane-grafted CNT.
4. a kind of Fracture Force that limits as claimed in claim 1 makes somebody a mere figurehead leading in cable, it is characterised in that the flame retardant coating is can porcelain
Change macromolecule flame retardant coating.
5. the as claimed in claim 1 a kind of Fracture Force that limits makes somebody a mere figurehead leading in cable, it is characterised in that also including FRP reinforcers,
The FRP reinforcers are arranged on the both sides of the light unit.
6. a kind of Fracture Force that limits as claimed in claim 1 makes somebody a mere figurehead leading in cable, it is characterised in that if the light unit includes
Dry optical unit tubes, some optical fiber are provided with the optical unit tubes.
7. a kind of Fracture Force that limits as claimed in claim 6 makes somebody a mere figurehead leading in cable, it is characterised in that between the optical unit tubes
Provided with water blocking yarn.
8. the as claimed in claim 1 a kind of Fracture Force that limits makes somebody a mere figurehead leading in cable, it is characterised in that the external diameter of leading in cable is
7.0mm。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113406757A (en) * | 2021-06-16 | 2021-09-17 | 江苏中天科技股份有限公司 | Butterfly-shaped optical cable and preparation method thereof |
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