CN114815109A - B2 ca-grade large-core multi-layer stranded flame-retardant air-blowing micro cable and preparation method thereof - Google Patents
B2 ca-grade large-core multi-layer stranded flame-retardant air-blowing micro cable and preparation method thereof Download PDFInfo
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- GHPGOEFPKIHBNM-UHFFFAOYSA-N antimony(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Sb+3].[Sb+3] GHPGOEFPKIHBNM-UHFFFAOYSA-N 0.000 claims description 4
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 4
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Images
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
- C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
-
- 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
- G02B6/441—Optical cables built up from sub-bundles
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/2224—Magnesium hydroxide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/22—Halogen free composition
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- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Insulated Conductors (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention provides a B2 ca-grade large-core multi-layer stranded flame-retardant air-blown micro-cable and a preparation method thereof, wherein the micro-cable comprises a central reinforcement, a cushion layer, a single-layer or double-layer stranded structure, a mica tape and an outer sheath which are sequentially arranged from inside to outside; each layer of twisted structure comprises a plurality of loose tubes which are symmetrically distributed along the axis of the cushion layer; each loose tube is internally provided with an optical fiber and flame-retardant fiber paste wrapping the optical fiber; the mica tape wraps the cable core with the twisted structure completely and is tightened by using the binding yarns, the outer sheath is made of flame retardant materials, and the flame retardant materials comprise: blend EVA 12-30%, ethylene-octene copolymer 5-20%, linear low density polyethylene with a bimodal structure 8-30%, maleic anhydride grafted PE 5-15%, flame retardant 20-50%, organic silicon char forming agent 2-10%, nitrogen synergist 1-3% and phosphate ester 1-3%; the flame retardant comprises superfine active aluminum hydroxide and magnesium hydroxide. The micro cable has excellent flame retardance and can reach Bca performance index.
Description
Technical Field
The invention belongs to the technical field of optical cables, and particularly relates to a B2 ca-grade large-core multi-layer stranded flame-retardant air-blown micro cable and a preparation method thereof.
Background
With the increasing of network coverage density of communication operators, optical cable wiring is increasingly dense, most indoor access is laid by pipeline air-blowing micro cables, but the optical cable also plays the role of a fire fuse, so that fire rapidly expands and spreads, expensive electronic instruments and equipment are damaged, normal operation and even paralysis of the whole line are influenced, and a large amount of smoke generated during burning threatens life safety.
The traditional flame-retardant air-blown optical cable has small core number, the loose tube adopts conventional PBT, and the fiber paste in the tube adopts conventional fiber paste, so that the flame-retardant grade is relatively low, and is Cca and below in general.
Disclosure of Invention
In view of the above, the present invention aims to provide a B2 ca-grade large-core multi-layer stranded flame-retardant air-blown micro-cable and a preparation method thereof, wherein the micro-cable has excellent flame retardancy.
The invention provides a B2 ca-grade large-core multi-layer stranded flame-retardant air-blown micro-cable which is characterized by comprising a central reinforcement, a cushion layer, a single-layer or double-layer stranded structure, a mica tape and an outer sheath which are sequentially arranged from inside to outside;
each layer of the twisted structure comprises a plurality of loose tubes which are symmetrically distributed along the axis of the cushion layer; each loose tube is internally provided with an optical fiber and flame-retardant fiber paste wrapping the optical fiber.
In the invention, if the single-layer stranded structure is adopted, the single-layer stranded structure comprises 10-15 loose tubes;
if the inner layer twisted structure is a double-layer twisted structure, the inner layer twisted structure comprises 6-10 loose tubes, and the outer layer twisted structure comprises 12-18 loose tubes.
In the invention, the stranded structure is provided with the tearing rope, and the tearing rope is placed between the sheath material and the mica tape.
In the invention, the mica tape completely covers the cable core with the stranded structure and is fastened by using the binding yarns.
In the invention, the waterproof mattress also comprises waterproof yarns, and the waterproof yarns are placed on the outer periphery of the mattress layer.
In the invention, the outer sheath is made of flame retardant materials, and the flame retardant materials comprise the following components in percentage by mass:
blending 12-30% of EVA (ethylene vinyl acetate), 5-20% of ethylene-octene copolymer, 8-30% of bimodal linear low density polyethylene, 5-15% of maleic anhydride grafted PE, 20-50% of flame retardant, 2-10% of organosilicon char former, 1-3% of nitrogen synergist and 1-3% of phosphate ester;
the flame retardant comprises superfine active aluminum hydroxide and magnesium hydroxide.
In the invention, the blended EVA is formed by blending an ethylene-vinyl acetate copolymer which takes an ethylene-vinyl acetate copolymer as a base material and has a VA% content higher than 40%;
the mass ratio of the superfine active aluminum hydroxide to the magnesium hydroxide in the flame retardant is (10-25): (10-25).
In the invention, the cushion layer comprises 20-60 parts by weight of polyethylene; 10-30 parts of an ethylene-octene copolymer; 3-10 parts of a compatilizer; 15-30 parts of modified magnesium hydroxide; 3-15 parts of silane modified nano kaolin; 4-15 parts of a brominated flame retardant; 2-8 parts of antimony white; 1-5 parts of a processing agent; 2-9 parts of black master batch; 0.5-2 parts of antioxidant.
In the invention, the loose tube is made of flame-retardant PBT by plastic sheathing;
the flame-retardant PBT comprises, by mass fraction, 70-80% of PBT, 15-20% of ammonium polyphosphate, 5-10% of a nitrogen-based flame retardant, 0-2% of a toughening agent, 0-5% of an antioxidant and 0-5% of glass fiber.
The invention provides a preparation method of a B2 ca-grade large-core multi-layer stranded flame-retardant air-blown micro cable, which comprises the following steps:
sleeving the colored optical fibers into the loose tubes filled with the flame-retardant fiber paste, and repeating to obtain a plurality of loose tubes;
arranging a single-layer or double-layer twisted structure on the outer periphery of a central reinforcing piece sleeved with a cushion layer, wherein each layer of twisted structure comprises a plurality of loose tubes symmetrically distributed along the axis of the cushion layer;
and wrapping a mica tape layer on the outer layer of the twisted structure, and uniformly extruding an outer sheath to form the B2 ca-grade large-core multi-layer twisted flame-retardant air-blowing micro cable.
The invention provides a B2 ca-grade large-core multi-layer stranded flame-retardant air-blown micro-cable which comprises a central reinforcement, a cushion layer, a single-layer or double-layer stranded structure, a mica tape and an outer sheath which are sequentially arranged from inside to outside; each layer of the twisted structure comprises a plurality of loose tubes which are symmetrically distributed along the axis of the cushion layer; each loose tube is internally provided with an optical fiber and flame-retardant fiber paste wrapping the optical fiber; the outer sheath is made of a flame-retardant material, and the flame-retardant material comprises the following components in percentage by mass: blending 12-30% of EVA (ethylene vinyl acetate), 5-20% of ethylene-octene copolymer, 8-30% of bimodal linear low density polyethylene, 5-15% of maleic anhydride grafted PE, 20-50% of flame retardant, 2-10% of organosilicon char former, 1-3% of nitrogen synergist and 1-3% of phosphate ester; the flame retardant comprises superfine active aluminum hydroxide and magnesium hydroxide. The air-blowing micro cable has excellent flame retardance and can reach Bca performance indexes.
Drawings
FIG. 1 is a schematic structural view of a B2 ca-grade large-core multi-layer single-layer stranded flame-retardant air-blown micro-cable according to the present invention;
FIG. 2 is a schematic structural view of a B2 ca-grade large-core multi-layer double-layer stranded flame-retardant air-blown micro-cable according to the present invention;
FIG. 3 is a flow chart of the B2 ca-grade large-core multi-layer stranded flame-retardant air-blown micro-cable process.
Detailed Description
The invention provides a B2 ca-grade large-core multi-layer stranded flame-retardant air-blown micro-cable which comprises a central reinforcement, a cushion layer, a single-layer or double-layer stranded structure, a mica tape and an outer sheath which are sequentially arranged from inside to outside;
each layer of the twisted structure comprises a plurality of loose tubes which are symmetrically distributed along the axis of the cushion layer; each loose tube is internally provided with an optical fiber and flame-retardant fiber paste wrapping the optical fiber.
The B2 ca-grade large-core multi-layer stranded flame-retardant air-blowing micro cable provided by the invention is mainly used for air-blowing micro cables in pipeline buildings, has large core number, high pipeline utilization rate and excellent flame-retardant performance, and reduces the loss caused by taking the cable as a burning object in case of fire.
See fig. 1 and 2; FIG. 1 is a schematic structural view of a B2 ca-grade large-core multi-layer single-layer stranded flame-retardant air-blown micro-cable according to the present invention; FIG. 2 is a schematic structural view of a B2 ca-grade large-core multi-layer double-layer stranded flame-retardant air-blown micro-cable according to the present invention;
the B2 ca-grade large-core multi-layer stranded flame-retardant air-blown micro cable comprises a central reinforcing part; the central reinforcement is a non-metallic central reinforcement.
A cushion layer is sleeved outside the central reinforcing piece; the cushion layer is prepared from 20-60 parts by weight of polyethylene; 10-30 parts of an ethylene-octene copolymer; 3-10 parts of a compatilizer; 15-30 parts of modified magnesium hydroxide; 3-15 parts of silane modified nano kaolin; 4-15 parts of brominated flame retardant; 2-8 parts of antimony white; 1-5 parts of a processing agent; 2-9 parts of black master batch; 0.5-2 parts of antioxidant.
In the present invention, the modified magnesium hydroxide may be selected from commercially available dry-modified magnesium hydroxide; adding a proper amount of inert solvent into dried magnesium hydroxide, mixing with the surface modification machine for surface organization, fully mixing, and drying or otherwise processing to obtain modified magnesium hydroxide; the inert solvent is selected from toluene, xylene, solvent gasoline or petroleum ether. The model of the modified magnesium hydroxide is preferably modified magnesium hydroxide of Weifang Ciliron magnesium industry Co., Ltd, and the model is as follows: H1410.
in the present invention, the compatibilizing agent in the blanket is preferably one or more selected from a cyclic acid anhydride type compatibilizing agent, a carboxylic acid type compatibilizing agent and an epoxy type compatibilizing agent; the processing agent is preferably selected from one or more of Methyl Methacrylate (MMA)/acrylate copolymer, acrylonitrile/styrene copolymer and MMA/styrene copolymer; the antioxidant is preferably an alkylphenol antioxidant and/or an aromatic phenol antioxidant; the brominated flame retardant is divided into an additive brominated flame retardant, a reactive brominated flame retardant and a high polymer brominated flame retardant, and is preferably an additive brominated flame retardant.
The B2 ca-grade large-core multi-layer stranded flame-retardant air-blown micro cable provided by the invention comprises a single-layer or double-layer stranded structure; each layer of the twisted structure comprises a plurality of loose tubes which are symmetrically distributed along the axis of the cushion layer; each loose tube is internally provided with an optical fiber and flame-retardant fiber paste wrapping the optical fiber.
In the invention, if the single-layer stranded structure is adopted, the single-layer stranded structure comprises 10-15 loose tubes; if the inner layer twisted structure is a double-layer twisted structure, the inner layer twisted structure comprises 6-10 loose tubes, and the outer layer twisted structure comprises 12-18 loose tubes.
In the invention, the flame-retardant fiber paste in the loose tube comprises, by mass, 70-80% of base oil, 7-9% of a composite thickening agent, 0-2% of a flame retardant and 0-5% of an antioxidant; the base oil is hydrogenated paraffin base oil-hydrogenated naphthenic base oil mixed oil, and the mass ratio of the hydrogenated paraffin base oil to the hydrogenated naphthenic base oil in the mixed oil is 2-2.5: 3-4.2; the composite thickening agent is a mixture of polyacrylamide and fatty alcohol-polyoxyethylene ether, and the mass ratio of the polyacrylamide to the fatty alcohol-polyoxyethylene ether in the mixture is 5-6: 7-8; the flame retardant is selected from one or more of a phosphorus organic flame retardant, a phosphorus inorganic flame retardant and a phosphorus-nitrogen flame retardant, and the flame retardant retards flame by a gas-phase flame retardant mechanism and a condensed-phase flame retardant mechanism respectively; the antioxidant is preferably an alkylphenol antioxidant and/or an aromatic phenol antioxidant.
The B2 ca-grade large-core multi-layer stranded flame-retardant air-blowing micro cable comprises a mica tape, wherein the mica tape is sleeved on the periphery of the single-layer or double-layer stranded structure; the mica tape has a good heat insulation effect; the mica tape of the present invention is a mica tape well known to those skilled in the art, and commercially available products thereof are used.
The B2 ca-grade large-core multi-layer stranded flame-retardant air-blown optical cable comprises an outer sheath; the outer sheath is made of a high-flame-retardant anti-cracking low-smoke halogen-free material, so that the flame retardant property is improved, and the fire-proof grade of the optical cable is improved; in the invention, the outer sheath is made of flame retardant materials, and the flame retardant materials comprise the following components in percentage by mass: blending 12-30% of EVA (ethylene vinyl acetate), 5-20% of ethylene-octene copolymer, 8-30% of bimodal linear low density polyethylene, 5-15% of maleic anhydride grafted PE, 20-50% of flame retardant, 2-10% of organosilicon char former, 1-3% of nitrogen synergist and 1-3% of phosphate ester; the flame retardant comprises superfine active aluminum hydroxide and magnesium hydroxide.
In the invention, the blended EVA comprises the following components in a mass ratio of 60-80: 20-40 of a blend of an ethylene vinyl acetate copolymer with a VA content of 5-40 wt% and an ethylene vinyl acetate copolymer with a VA content of more than 40%.
In the invention, the flame-retardant system of the outer sheath adopts superfine active aluminum hydroxide and magnesium hydroxide as main flame retardants, and the average particle size of the superfine active aluminum hydroxide and the magnesium hydroxide is less than 1 micron. The flame-retardant material of the outer sheath can block an air system: by adding the flame retardant, the shell capable of isolating air can be formed by rapid nucleation, so that the flame can be rapidly extinguished; but also can dilute the air system: inert gas is generated in the combustion process, and the fire source is subjected to oxygen deficiency to inhibit combustion so as to extinguish the fire source and improve the self-extinguishing performance of the fire; the heat release system can also be reduced: the heat absorption capacity is increased to reduce the temperature of the fire source, so that the combustion of the fire source is slowed down, and the purpose of extinguishing is achieved; and smoke suppression: the smoke amount is limited by suppressing the smoke amount, and the light transmittance during the burning of the optical cable is improved.
In the present invention, the nitrogen-based synergist is generally melamine; the linear low-density polyethylene with bimodal structure is a polymer formed by using ethylene as a main raw material and a small amount of alpha-olefin, a catalyst and the like, and preferably adopts the linear low-density polyethylene with bimodal structure which is sold in northern Europe chemical industry, and the like.
The invention provides a preparation method of a B2 ca-grade large-core multi-layer stranded flame-retardant air-blown micro cable, which comprises the following steps:
sleeving the colored optical fibers into the loose tubes filled with the flame-retardant fiber paste, and repeating to obtain a plurality of loose tubes;
arranging a single-layer or double-layer twisted structure on the outer periphery of a central reinforcing piece sleeved with a cushion layer, wherein each layer of twisted structure comprises a plurality of loose tubes symmetrically distributed along the axis of the cushion layer;
and then wrapping a layer of mica tape on the outer layer of the stranded structure, and uniformly extruding a layer of outer sheath to form the B2 ca-grade large-core multi-layer stranded flame-retardant air-blown optical cable.
The invention screens the optical fiber which is put in storage, and selects the optical fiber with excellent transmission characteristic and qualified tension. The invention colors the optical fiber, selects standard full-color spectrum for marking, requires high temperature for colorlessness and ensures easy identification during connection.
The loose sleeve passes through an extrusion molding die and is provided with tension, and the highest sleeve adopts a 36-core tube structure.
According to the invention, preferably, after a layer of mica tape is wrapped, a tearing rope is placed, and then the outer sheath is uniformly extruded; a single tear string is preferably placed.
The B2 ca-grade large-core multi-layer stranded flame-retardant air-blowing optical cable provided by the invention has excellent burning resistance, excellent self-extinguishing after fire leaving and good nucleation, and simultaneously keeps low heat release and low smoke release during the burning of the optical cable, thereby meeting the requirements of CPR certification on the flame retardant performance of B2 ca-grade optical cables, and the specific test method refers to EN50399, EN60332-1-2 and EN 61034-2.
For further illustration of the present invention, the following examples are provided to describe the B2 ca-grade large-core multi-layer stranded flame-retardant air-blown micro-cable and the preparation method thereof in detail, but they should not be construed as limiting the scope of the present invention.
Example 1
According to the process shown in FIG. 3:
(1) and (3) optical fiber warehousing: screening the optical fibers which are put in storage, and selecting the optical fibers with excellent transmission characteristics and qualified tension;
(2) and (3) coloring the optical fiber: firstly, coloring the optical fiber, selecting a standard full-color spectrum for marking, requiring high temperature for no fading, and ensuring easy identification during splicing;
(3) plastic sheathing: in the sleeve loosening process, tension is set through an extrusion molding die, and the highest sleeve adopts a 36-core each-tube structure;
sleeving the colored optical fiber into a high-modulus sleeve filled with flame-retardant fiber paste, so that the optical fiber in the sleeve has stable extra length control and transmission characteristics;
the flame-retardant fiber paste comprises 75% of base oil (hydrogenated paraffin base oil and hydrogenated naphthenic base oil in a mass ratio of 2: 3), 8% of composite thickening agent (a mixture of polyacrylamide and fatty alcohol polyoxyethylene ether in a mass ratio of 6: 8), 2% of phosphorus-nitrogen flame retardant and 1.8% of alkylphenol antioxidant;
(4) cabling: cabling adopts a central reinforcing piece, a cushion layer of the central reinforcing piece is always (directly) wound (lapped), and then single-layer 12 loose sleeves are stranded; or double-layer loose tubes, 9 loose tubes on the inner layer and 15 loose tubes on the outer layer; a layer of mica tape is wrapped on the outer layer of the cable core;
the cushion layer comprises 50 parts of polyethylene; 20 parts of ethylene-octene copolymer; 5 parts of a cyclic anhydride type compatilizer; 20 parts of modified magnesium hydroxide; 9 parts of silane modified nano kaolin; 9 parts of a brominated flame retardant; 4 parts of antimony white; 3 parts of a processing agent; 5 parts of black master batch; 1 part of alkylphenol antioxidant
(5) Wrapping the outer sheath: a single tearing rope is arranged outside the cable core, and a layer of high-flame-retardant anti-cracking low-smoke halogen-free sheath material is uniformly extruded to form a B2 ca-grade large-core multi-layer stranded flame-retardant air-blown cable;
the high-flame-retardant anti-cracking low-smoke halogen-free sheath material comprises 20 parts of blended EVA (ethylene-vinyl acetate copolymer), 15 parts of ethylene-octene copolymer, 20 parts of linear low-density polyethylene with a bimodal structure, 8 parts of maleic anhydride grafted PE, 35 parts of a flame retardant (a mixture of superfine active aluminum hydroxide and magnesium hydroxide in a mass ratio of 15: 15), 7 parts of an organic silicon carbon forming agent, 2 parts of a nitrogen synergist and 2 parts of phosphate ester;
(6) detecting and ex-warehouse: and finally, carrying out a full performance test on the optical cable, packaging and taking out of the warehouse after the optical cable is qualified, wherein the result is shown in a table 1:
table 1 results of performance test of micro-cable prepared in example 1
From the above embodiments, the invention provides a B2 ca-grade large-core multi-layer stranded flame-retardant air-blown micro cable, which comprises a central reinforcement, a cushion layer, a single-layer or double-layer stranded structure, a mica tape and an outer sheath, which are sequentially arranged from inside to outside; each layer of the twisted structure comprises a plurality of loose tubes which are symmetrically distributed along the axis of the cushion layer; each loose tube is internally provided with an optical fiber and flame-retardant fiber paste wrapping the optical fiber; the outer sheath is made of a flame-retardant material, and the flame-retardant material comprises the following components in percentage by mass: blending 12-30% of EVA (ethylene vinyl acetate), 5-20% of ethylene-octene copolymer, 8-30% of bimodal linear low density polyethylene, 5-15% of maleic anhydride grafted PE, 20-50% of flame retardant, 2-10% of organosilicon char former, 1-3% of nitrogen synergist and 1-3% of phosphate ester; the flame retardant comprises superfine active aluminum hydroxide and magnesium hydroxide. The air-blowing micro cable has excellent flame retardance and can reach Bca performance indexes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A B2 ca-grade large-core multi-layer stranded flame-retardant air-blown micro-cable is characterized by comprising a central reinforcement, a cushion layer, a single-layer or double-layer stranded structure, a mica tape and an outer sheath which are sequentially arranged from inside to outside;
each layer of the twisted structure comprises a plurality of loose tubes which are symmetrically distributed along the axis of the cushion layer; each loose tube is internally provided with an optical fiber and flame-retardant fiber paste wrapping the optical fiber;
the outer sheath is made of a flame-retardant material, and the flame-retardant material comprises the following components in percentage by mass:
blending 12-30% of EVA (ethylene vinyl acetate), 5-20% of ethylene-octene copolymer, 8-30% of bimodal linear low density polyethylene, 5-15% of maleic anhydride grafted PE, 20-50% of flame retardant, 2-10% of organosilicon char former, 1-3% of nitrogen synergist and 1-3% of phosphate ester;
the flame retardant comprises superfine active aluminum hydroxide and magnesium hydroxide.
2. The B2 ca-grade large-core multi-layer stranded flame-retardant air-blown micro-cable according to claim 1, wherein if the cable is a single-layer stranded structure, the single-layer stranded structure comprises 10-15 loose tubes;
if the inner layer twisted structure is a double-layer twisted structure, the inner layer twisted structure comprises 6-10 loose tubes, and the outer layer twisted structure comprises 12-18 loose tubes.
3. The B2 ca-grade large-core multi-layer stranded flame-retardant air-blown micro-cable according to claim 1, wherein a tear rope is arranged in the stranded structure and placed between the sheathing material and the mica tape.
4. The B2 ca-grade large-core multi-layer stranded flame-retardant air-blown micro-cable according to claim 1, further comprising water-blocking yarns, wherein the water-blocking yarns are placed around the outer periphery of the mat layer.
5. The B2 ca-grade large-core multi-layer stranded flame-retardant air-blown micro-cable according to claim 1, wherein the blended EVA is formed by blending an ethylene vinyl acetate copolymer with a VA content of 5-40% as a base material with an ethylene vinyl acetate copolymer with a VA content of more than 40%.
6. The B2 ca-grade large-core multi-layer stranded flame-retardant air-blown micro-cable according to claim 1, wherein the mass ratio of the superfine active aluminum hydroxide to the magnesium hydroxide in the flame retardant is (10-25): (10-25).
7. The B2 ca-grade large-core multi-layer stranded flame-retardant air-blown micro-cable according to claim 1, wherein the cushion layer comprises 20-60 parts by weight of polyethylene; 10-30 parts of an ethylene-octene copolymer; 3-10 parts of a compatilizer; 15-30 parts of modified magnesium hydroxide; 3-15 parts of silane modified nano kaolin; 4-15 parts of a brominated flame retardant; 2-8 parts of antimony white; 1-5 parts of a processing agent; 2-9 parts of black master batch; 0.5-2 parts of antioxidant.
8. The B2 ca-grade large-core multi-layer stranded flame-retardant air-blown micro-cable according to claim 1, wherein the loose tube is made of flame-retardant PBT by sheathing;
the flame-retardant PBT comprises, by mass fraction, 70-80% of PBT, 15-20% of ammonium polyphosphate, 5-10% of nitrogen flame retardant, 0-2% of toughening agent, 0-5% of antioxidant and 0-5% of glass fiber.
9. A method for preparing a B2 ca-grade large-core multi-layer stranded flame-retardant air-blown micro-cable, which comprises the following steps:
sleeving the colored optical fibers into the loose tubes filled with the flame-retardant fiber paste, and repeating to obtain a plurality of loose tubes;
arranging a single-layer or double-layer twisted structure on the outer periphery of a central reinforcing piece sleeved with a cushion layer, wherein each layer of twisted structure comprises a plurality of loose tubes symmetrically distributed along the axis of the cushion layer;
and then wrapping a layer of mica tape on the outer layer of the stranded structure, and uniformly extruding a layer of outer sheath to form the B2 ca-grade large-core multi-layer stranded flame-retardant air-blown micro cable.
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| CN117331184A (en) * | 2023-11-20 | 2024-01-02 | 浙江富春江光电科技有限公司 | Aging-resistant outdoor optical cable and preparation method thereof |
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