CN107845447B - Low-attenuation capacity-expanding photoelectric composite low-voltage cable - Google Patents
Low-attenuation capacity-expanding photoelectric composite low-voltage cable Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/292—Protection against damage caused by extremes of temperature or by flame using material resistant to heat
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- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
- H01B11/22—Cables including at least one electrical conductor together with optical fibres
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- C08L2207/00—Properties characterising the ingredient of the composition
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Abstract
The invention discloses a low-attenuation capacity-expanding photoelectric composite low-voltage cable, wherein insulating layers are coated on the outer surfaces of a ground core conductor, 3 power core conductors and a control core conductor, a first heat-resistant sheath layer is coated on the outer surface of a photoelectric unit, and a reserved optical channel consists of a tensile insulating layer and a second heat-resistant sheath layer coated on the outer surface of the tensile insulating layer; the first heat-resistant sheath layer and the second heat-resistant sheath layer are composed of the following components: high-density polyethylene resin, low-density polyethylene resin, poly-p-benzamide, trioctyl trimellitate, stearic acid, barium stearate, tributyl citrate, diatomite, maleic anhydride grafted PE, calcium-zinc heat stabilizer, antioxidant and aminopropyltriethoxysilane. The aging test temperature of the thermoplastic sheath material reaches 158 ℃, and the change rate of the tensile strength and the change rate of the elongation at break are not more than +/-20%.
Description
Technical Field
The invention relates to the technical field of optical fiber composite low-voltage cables, in particular to a low-attenuation capacity-expanding photoelectric composite low-voltage cable.
Background
In the field of power optical fiber transmission, a heat-resistant optical unit and an expansion channel are additionally arranged in a low-voltage power cable at present, optical fiber expansion is carried out by an optical unit air-blowing method laid after the optical unit is utilized, a product is additionally provided with the heat-resistant optical unit and an optical communication pipeline in advance in the low-voltage power cable, and the following technical problems mainly exist:
1. the electrical units (insulated wire cores) in the optical fiber composite low-voltage cable have good physical and mechanical properties, and the electrical properties of the optical fiber composite low-voltage cable are not easily damaged in the production process of each procedure; while the optical fibers in the optical unit are the weakest point in the composite cable. The performance of the optical unit is very susceptible to influence in the production process, for example, in the process of the optical and electrical unit composite cabling, the optical fiber is broken or the optical fiber transmission performance is unqualified due to the reasons that the structural design of the composite cable is unreasonable, the control precision of the paying-off tension is not enough, and the like.
2. When the optical fiber in the common optical unit is heated to be over 85 ℃, the optical fiber attenuation is obviously increased along with the gradual increase of the temperature, the heat conduction of the power line core to the optical unit and the dilatation channel is effectively delayed by researching and developing special high-heat-resistance thermoplastic sheath materials, the temperature rise time is prolonged, and the optical fiber transmission attenuation values of the optical unit and the dilatation optical unit are reduced by using the peak period of electric waves; in addition, the special material adopts thermoplasticity, so that various problems caused by the crosslinking problem in the production process of the optical unit are effectively reduced.
3. The air blowing laying of the common optical cable is horizontal laying, and only the micro cable is horizontally blown into a special preset pipeline through air flow conveying of a mechanical propeller and an air compressor. However, for such an expandable optical fiber composite cable, the cable often cannot be laid horizontally during construction and laying, and may face various situations such as pipe penetration, turning, suspension, etc., and sometimes even requires direct air blowing and laying on a tray before laying. The cable is blown on the cable drum, and the whole blowing laying process has larger resistance to the optical unit and irregular advancing direction and position. The traditional air blowing mode can not meet the requirement of laying the optical fiber composite cable behind the optical unit, so the main problem of the expandable optical fiber composite cable is to solve the problem of how to solve the problem of expandable air blowing laying of the optical unit under the conditions of large resistance, irregularity and long distance, and the requirement of expandable air blowing laying is greatly improved. The key technology mainly solves the problem of expanding capacity and blowing laying of products in the aspects of size and reinforced structure optimization of an optical communication pipeline, air pressure control of an air compressor, an air blowing mode and the like.
Disclosure of Invention
The invention aims to provide a low-attenuation dilatation photoelectric composite low-voltage cable which improves the temperature resistance grade of a composite cable optical unit sheath and delays the temperature conduction time, the cable is extruded outside an optical unit to be used as a protective layer, the aging test temperature of a thermoplastic sheath material reaches 158 ℃ for 168 hours, the thermal resistance coefficient of the material is not less than 6.0, and the attenuation of an optical fiber of the power cable in the environment of more than 10% of the maximum work is not more than 0.15 db.
In order to achieve the purpose, the invention adopts the technical scheme that: a low-attenuation capacity-expanding photoelectric composite low-voltage cable comprises a photoelectric unit, at least 1 ground conductor, 3 power conductor, a control conductor and a reserved light channel;
the outer surfaces of the ground wire core conductors, the 3 power wire core conductors and the control wire core conductors are coated with insulating layers, the outer surface of the photoelectric unit is coated with a first heat-resistant sheath layer, and the reserved optical channel consists of a tensile insulating layer and a second heat-resistant sheath layer coated on the outer surface of the tensile insulating layer;
the expandable optical fiber composite low-voltage cable is coated with a wrapping layer, and the wrapping layer comprises photoelectric units, at least 1 ground core conductor, 3 power core conductors, a control core conductor and the outer surface of a reserved optical channel;
the first heat-resistant sheath layer and the second heat-resistant sheath layer are composed of the following components:
100 parts of high-density polyethylene resin,
20 to 35 parts of low-density polyethylene resin,
20-30 parts of poly-p-benzamide,
18-25 parts of trioctyl trimellitate,
15-25 parts of stearic acid,
10-15 parts of barium stearate,
8-12 parts of tributyl citrate,
6-10 parts of diatomite,
5-10 parts of maleic anhydride grafted PE,
4-8 parts of a calcium-zinc heat stabilizer,
2-3 parts of an antioxidant agent,
5-8 parts of aminopropyltriethoxysilane.
The technical scheme of the further improvement of the technical scheme is as follows:
1. in the scheme, the antioxidant is at least one of antioxidant 1010, antioxidant DLTP and antioxidant DSTP.
2. In the above scheme, a plurality of filling strips are arranged between the belting layer and the photoelectric unit, at least 1 ground wire core conductor, 3 power wire core conductors, the control wire core conductor and the reserved optical channel.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
the invention relates to a novel low-attenuation dilatation photoelectric composite low-voltage cable, which adopts 100 parts of high-density polyethylene resin, 20-35 parts of low-density polyethylene resin, 20-30 parts of poly-p-benzamide and 6-10 parts of diatomite, improves the temperature resistance grade of a composite cable optical unit sheath and delays the temperature conduction time, is extruded outside an optical unit to be used as a sheath, the temperature of an aging test of a thermoplastic sheath material reaches 158 ℃ for 168 hours, the thermal resistance coefficient of the material is not less than 6.0, and the attenuation of optical fibers of the power cable in the environment of more than 10% of the maximum work is not more than 0.15 db; and secondly, based on 100 parts of high-density polyethylene resin, 20-35 parts of low-density polyethylene resin, 20-30 parts of poly-p-benzamide and 6-10 parts of diatomite, 8-12 parts of tributyl citrate and 5-8 parts of aminopropyl triethoxysilane are further added, and the tensile strength change rate and the elongation at break change rate are not more than +/-20% when the aging test temperature of the thermoplastic sheath material reaches 158 ℃.
Drawings
Fig. 1 is a schematic structural diagram of the low-attenuation capacity-expanding photoelectric composite low-voltage cable.
In the above drawings: 1. a photoelectric unit; 2. a ground core conductor; 3. a power core conductor; 4. a control wire core conductor; 5. reserving an optical channel; 6. an insulating layer; 7. a first heat resistant jacket layer; 8. a tensile insulating layer; 9. a second heat resistant jacket layer; 10. a belting layer; 11. an outer jacket layer; 12. and (6) filling the strip.
Detailed Description
Examples 1 to 4: a low-attenuation dilatation photoelectric composite low-voltage cable comprises a photoelectric unit 1, at least 1 ground core conductor 2, 3 power core conductors 3, a control core conductor 4 and a reserved light channel 5;
the ground wire core conductors 2, the power wire core conductors 3 and the control wire core conductors 4 are coated with insulating layers 6 on the outer surfaces, the photoelectric unit 1 is coated with a first heat-resistant sheath layer 7 on the outer surface, and the reserved optical channel 5 consists of a tensile insulating layer 8 and a second heat-resistant sheath layer 9 coated on the outer surface of the tensile insulating layer 8;
the expandable optical fiber composite low-voltage cable is coated with a wrapping layer 10, and comprises a photoelectric unit 1, at least 1 ground core conductor 2, 3 power core conductors 3, a control core conductor 4 and the outer surface of a reserved light channel 5, wherein an outer sheath layer 11 is coated on the outer surface of the wrapping layer 10;
the first heat-resistant sheath layer 7 and the second heat-resistant sheath layer 9 are composed of the following components:
TABLE 1
The first heat-resistant sheath layer 7 and the second heat-resistant sheath layer 9 are obtained through the following steps:
step one, adding 100 parts of high-density polyethylene resin, 20-35 parts of low-density polyethylene resin, 20-30 parts of poly-p-benzamide, 18-25 parts of trioctyl trimellitate, 15-25 parts of stearic acid and 10-15 parts of barium stearate into a high-speed mixer, stirring and mixing at the temperature of 95-105 ℃ and the speed of 500 plus materials at 800rpm for 20-30min, then putting 8-12 parts of tributyl citrate, 6-10 parts of diatomite and 5-10 parts of maleic anhydride grafted PE into a screw double extruder, adding EVA, controlling the temperature of a melting section of the extruder at 175 ℃ of 140 plus materials, melting and blending at the rotating speed of 600r/min of 400 plus materials for 10-20min, and then extruding and granulating to obtain modified EVA particles;
step two, adding HDPE, EPDM, a compatilizer and the prepared modified EVA particles into a mixing roll, mixing for 10-20min at the temperature of 105 and 110 ℃ to obtain rubber compound;
step three, putting the prepared rubber compound, 4-8 parts of calcium-zinc heat stabilizer, 2-3 parts of antioxidant and 5-8 parts of aminopropyltriethoxysilane into an internal mixer, mixing for 2-3min, controlling the rotation speed of the internal mixer at 150-;
and step four, conveying the mixed material obtained after banburying into a screw extruder through double-cone shearing for extrusion processing, wherein the temperature of a machine body during extrusion is 140 +/-10 ℃, the temperature of a machine head is 110 +/-10 ℃, vulcanizing the mixture on a flat vulcanizing machine after extrusion, hot pressing the mixture for 8-10min at the temperature of 160-180 ℃, cold pressing the mixture for 4-6min at normal temperature, the vulcanizing pressure of 6-10MPa and the wire outlet speed of 12-15m/min, and thus obtaining the cable material of the first heat-resistant sheath layer 7 and the second heat-resistant sheath layer 9.
The antioxidant is at least one of antioxidant 1010, antioxidant DLTP and antioxidant DSTP.
A plurality of filling strips 12 are arranged between the belting layer 10 and the photoelectric unit 1, at least 1 ground wire core conductor 2, 3 power wire core conductors 3, the control wire core conductor 4 and the reserved light channel 5.
The performance test data of the heat-resistant sheath layer material prepared in the example are as follows:
TABLE 2 Heat-resistant sheath layer performance index of optical fiber composite low-voltage cable
When the low-attenuation dilatation photoelectric composite low-voltage cable is adopted, 100 parts of high-density polyethylene resin, 20-35 parts of low-density polyethylene resin, 20-30 parts of poly-p-benzamide and 6-10 parts of diatomite are adopted, the temperature resistance grade and the temperature conduction time delay of a composite cable optical unit sheath are improved, the composite cable optical unit sheath is extruded outside an optical unit to serve as a sheath, the aging test temperature of a thermoplastic sheath material reaches 158 ℃ and is 168 hours, the thermal resistance coefficient of the material is not less than 6.0, and the attenuation of an optical fiber of the power cable in an environment which is 10% higher than the maximum working temperature is not more than 0.15 db; and secondly, based on 100 parts of high-density polyethylene resin, 20-35 parts of low-density polyethylene resin, 20-30 parts of poly-p-benzamide and 6-10 parts of diatomite, 8-12 parts of tributyl citrate and 5-8 parts of aminopropyl triethoxysilane are further added, and the tensile strength change rate and the elongation at break change rate are not more than +/-20% when the aging test temperature of the thermoplastic sheath material reaches 158 ℃.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (3)
1. The utility model provides a low decay dilatation photoelectricity composite low tension cable which characterized in that: the capacity-expansion photoelectric composite low-voltage cable comprises a photoelectric unit (1), at least 1 ground wire core conductor (2), 3 power wire core conductors (3), a control wire core conductor (4) and a reserved optical channel (5);
the ground wire core conductors (2), the 3 power wire core conductors (3) and the control wire core conductors (4) are coated with insulating layers (6) on the outer surfaces, the photoelectric unit (1) is coated with a first heat-resistant sheath layer (7) on the outer surface, and the reserved light channel (5) consists of a tensile insulating layer (8) and a second heat-resistant sheath layer (9) coated on the outer surface of the tensile insulating layer (8);
a wrapping layer (10) is wrapped on the outer surfaces of the photoelectric unit (1), at least 1 ground wire core conductor (2), 3 power wire core conductors (3), the control wire core conductor (4) and the reserved light channel (5) of the low-attenuation capacity-expansion photoelectric composite low-voltage cable, and an outer sheath layer (11) is wrapped on the outer surface of the wrapping layer (10);
the first heat-resistant sheath layer (7) and the second heat-resistant sheath layer (9) are composed of the following components:
100 parts of high-density polyethylene resin,
20 to 35 parts of low-density polyethylene resin,
20-30 parts of poly-p-benzamide,
18-25 parts of trioctyl trimellitate,
15-25 parts of stearic acid,
10-15 parts of barium stearate,
8-12 parts of tributyl citrate,
6-10 parts of diatomite,
5-10 parts of maleic anhydride grafted PE,
4-8 parts of a calcium-zinc heat stabilizer,
2-3 parts of an antioxidant agent,
5-8 parts of aminopropyltriethoxysilane.
2. The low-attenuation capacity-expanding photoelectric composite low-voltage cable according to claim 1, wherein: a plurality of filling strips (12) are arranged between the belting layer (10) and the photoelectric unit (1), at least 1 ground wire core conductor (2), 3 power wire core conductors (3), the control wire core conductor (4) and the reserved light channel (5).
3. The low-attenuation capacity-expanding photoelectric composite low-voltage cable according to claim 1, wherein: the antioxidant is at least one of antioxidant 1010, antioxidant DLTP and antioxidant DSTP.
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