High-strength weather-resistant insulating optical unit preparation process, device, optical unit and composite cable

Abstract

The present invention relates to a high-strength weather-resistant insulating optical unit preparation process, wherein the component mixture required for preparing the high-strength weather-resistant insulating sleeve is stirred and mixed uniformly; the mixture is baked in a baking furnace, and the baked mixed material is introduced into the hopper of an extruder; the optical fiber and the heated fiber paste are introduced into the high-strength weather-resistant insulating sleeve that is extruded and formed; the optical fiber, the fiber paste and the high-strength weather-resistant insulating sleeve are subjected to constant temperature cooling and shaping; the high-strength weather-resistant plastic sleeve shrinks during constant temperature cooling and shaping, and the optical fiber is extruded into a non-linear state; air is pumped around the high-strength weather-resistant plastic sleeve to form a negative pressure to control the outer diameter of the high-strength weather-resistant plastic sleeve that has been extruded and formed. The high-strength weather-resistant insulating optical unit of the present invention can withstand high temperatures for a long time, resist ultraviolet aging, and resist chemical corrosion such as acid, alkali, and salt, and can meet the requirements of co-core twisting with metal single wires and long-term outdoor wiring use. It can be compounded in cables such as ground wires and conductors in power grid transmission lines to realize power transmission and optical fiber communication.

Description

Technical Field

[0001] The invention relates to the technical field of optical cables, and provides a high-strength weather-resistant insulating optical unit preparation process, a preparation device, an optical unit and a composite cable. Background Art

[0002] The construction of power grids is accelerating towards intelligent and digital development, forming power optical cables that combine optical fibers with power grid ground wires and conductors, such as OPGW and OPPC, and are widely used. However, traditional power optical cables use stainless steel tube optical units combined with power grid ground wires or conductors. The stainless steel tubes are also charged during power grid operation. When installed and used in the power grid, optical fibers and metal conductors need to be photoelectrically separated, which makes construction difficult, inefficient, and has high installation costs. At the same time, the stainless steel tubes at the optical fiber connection positions are charged, resulting in high-voltage discharge problems, making daily operation and maintenance difficult. Summary of the invention

[0003] To this end, the technical problem to be solved by the present invention is to overcome the problems in the prior art such as the difficulty in installation and application of power optical cables, the live joint position and the lack of safety in daily maintenance, and to provide a preparation process, preparation device, optical unit and composite cable of an optical unit. The high-strength weather-resistant insulating optical unit can replace the stainless steel tube optical unit and can be composited with the cables of the power grid ground wire and the conductor to form an optoelectronic composite cable, which can meet the needs of co-core twisting with metal single wires and long-term outdoor wiring use.

[0004] In the first aspect, in order to solve the above technical problems, the present invention provides a high-strength weather-resistant insulating optical unit preparation process, including the following specific steps:

[0005] S1. Stir the mixture of components required for preparing the high-strength weather-resistant insulating sleeve with a mixer at 10-20 rpm for 10-20 minutes to mix the various materials in the mixture evenly;

[0006] S2, drying the uniformly mixed mixture in a drying furnace at a temperature of 100-200° C. for 4-8 hours, and feeding the dried mixed material into a hopper of an extruder;

[0007] S3, setting the screw chamber temperature of the extruder at 340-410°C, and the head temperature of the extruder at 350-450°C;

[0008] S4, heating the fiber paste to 80-200°C;

[0009] S5, introducing the optical fiber and the heated fiber paste into an extruded high-strength weather-resistant insulating sleeve;

[0010] S6. Constant temperature cooling and shaping of the optical fiber, fiber paste and high-strength weather-resistant insulating sleeve, with the temperature set at 50-200°C;

[0011] S7. The high-strength weather-resistant insulating sleeve shrinks during constant temperature cooling and shaping, and the optical fiber is squeezed into a non-straight state;

[0012] S8. When the high-strength weather-resistant insulating sleeve cools and shrinks, negative pressure is formed around the high-strength weather-resistant insulating sleeve by exhausting air, and the outer diameter of the high-strength weather-resistant insulating sleeve that has been extruded is controlled to achieve the shaping of the high-strength weather-resistant insulating sleeve.

[0013] In a second aspect, in order to solve the above technical problems, the present invention provides a device for preparing a high-strength weather-resistant insulating light unit, which is applied to the high-strength weather-resistant insulating light unit preparation process described in the first aspect, comprising:

[0014] An extrusion die, which is fixed in the extruder through a centering fixture and an extrusion die sleeve;

[0015] A shaping device is arranged outside the extruder and opposite to the extrusion die sleeve. The shaping device and the extrusion die are arranged on the same horizontal line. A constant temperature device is arranged on the outside of the shaping device for preheating or cooling the shaping device.

[0016] An optical fiber paste convergence introduction tube, which is inserted into the interior of the centering fixture and the extrusion mold and is used to wrap the paste around the outside of the optical fiber; a through hole 1 is provided at the center of the optical fiber paste convergence introduction tube, and an optical fiber paste introduction port connected to the through hole 1 is provided on the optical fiber paste convergence introduction tube;

[0017] A fiber guide tube is arranged in a through hole 1 of the optical fiber paste convergence introduction tube, and one end of the fiber guide tube is connected to the tail of the optical fiber paste convergence introduction tube.

[0018] In one embodiment of the present invention, a fiber paste heating conduit is further provided on the fiber paste introduction port, and the fiber paste heating conduit is connected to the fiber paste filling machine.

[0019] In one embodiment of the present invention, the diameter of the through hole 1 gradually decreases from the fiber paste inlet toward the extrusion die.

[0020] In one embodiment of the present invention, there is a through hole 2 at the center position of the shaping device, and a plurality of air guide holes penetrating the through hole 2 are arranged around the through hole 2, and the air guide holes are arranged perpendicular to the through hole 2. The air guide holes are connected to the air extraction holes through gas channels, and the air extraction holes are connected to an external air extraction pump.

[0021] In one embodiment of the present invention, the centering and fixing device includes a base and a conical positioning sleeve integrally formed with the base, and the conical positioning sleeve is provided with a positioning cavity 1 adapted to the extrusion mold and a positioning cavity 2 adapted to the end of the optical fiber paste convergence introduction tube.

[0022] In a third aspect, the present invention provides an optical unit, which is prepared by the high-strength weather-resistant insulating optical unit preparation process in the first aspect, and includes an optical fiber, a fiber paste, and a high-strength weather-resistant insulating sleeve; the optical fiber is inserted into the interior of the high-strength weather-resistant insulating sleeve in a non-linear state, and the fiber paste is filled between the optical fiber and the high-strength weather-resistant insulating sleeve; the optical fiber is spiral or wavy; wherein the high-strength weather-resistant insulating sleeve includes the following components by mass percentage:

[0023] Crystalline aromatic thermoplastic polymer 80% to 99.5%;

[0024] Aromatic heterocyclic polymer compounds 0-20%;

[0025] Carbon black 0-10%;

[0026] Antioxidant 0-5%.

[0027] In one embodiment of the present invention, the crystalline aromatic thermoplastic polymer is one or more of polyetheretherketone (PEEK), polyetherketone (PEK), polyetherketoneketone (PEKK), polyetheretherketoneketone (PEEKK) or polyetherketoneetherketoneketone (PEKEKK);

[0028] In one embodiment of the present invention, the aromatic heterocyclic polymer compound is one or more of polyimide (PI), polyamide-imide (PAI) or polyetherimide (PEI).

[0029] In a fourth aspect, in order to solve the above technical problems, the present invention also provides a composite cable, comprising the optical unit described in the third aspect, wherein the optical unit is co-twisted with a conductive metal wire and is capable of power transmission and optical fiber communication.

[0030] The above technical solution of the present invention has the following beneficial effects compared with the prior art:

[0031] The high-strength weather-resistant insulating optical unit preparation process, device, optical unit and composite cable of the present invention can continuously extrude and produce high-strength weather-resistant insulating sleeves through the preparation process, and continuously introduce optical fibers and fiber paste at the same time, and realize stable and consistent continuous production of the outer diameter, wall thickness and spiral bending amount of the optical fiber in the high-strength weather-resistant insulating sleeve through a shaping film; the strength of the prepared high-strength weather-resistant insulating optical unit can reach above 90MPa, and at the same time, it can withstand high temperatures ≥250°C for a long time, resist ultraviolet aging, and resist chemical corrosion such as acids, alkalis, and salts, and can meet the needs of co-core twisting with metal single wires and long-term outdoor wiring use, and can be composited in cables such as ground wires and conductors in power grid transmission lines to realize multiple functions of power transmission and optical fiber communication, and the optical fiber in the high-strength weather-resistant insulating optical unit is in a non-linear state, which can gradually offset the length of the cable extension. During use, the optical fiber in the weather-resistant insulating optical unit is not subject to tensile stress, and can cope with the problem of creep elongation of the cable caused by long-term use of overhead power transmission cables erected on iron towers, thereby extending the service life of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0033] Figure 1 It is a structural schematic diagram of a device for preparing a high-strength weather-resistant insulating optical unit of the present invention;

[0034] Figure 2 for Figure 1 A three-dimensional cross-sectional schematic diagram of a preparation device and an extruder for a high-strength weather-resistant insulating optical unit is shown;

[0035] Figure 3 for Figure 1 A structural schematic diagram of a shaping device of a manufacturing device for a high-strength weather-resistant insulating optical unit is shown;

[0036] Figure 4 yes Figure 1 A structural schematic diagram of a centering and fixing device of a manufacturing device for a high-strength weather-resistant insulating optical unit is shown;

[0037] Figure 5 It is a cross-sectional schematic diagram of the high-strength weather-resistant insulating optical unit of the present invention;

[0038] Figure 6 It is a schematic cross-sectional view of the high-strength weather-resistant insulating optical unit composite ground wire of the present invention;

[0039] Figure 7 It is a schematic cross-sectional view of the high-strength weather-resistant insulated optical unit composite wire of the present invention;

[0040] Explanation of the reference numerals in the specification: 1. optical unit; 11-optical fiber; 12-fiber paste; 13-high-strength weather-resistant insulating sleeve; 2c-first metal wire; 2a-second metal wire; 2b-third metal wire; 4-extruder; 5-centering and fixing device; 6-fiber guide tube; 7-optical fiber paste convergence inlet tube; 71-fiber paste inlet port; 72-fiber paste heating duct; 8-extrusion mold; 9-forming device; 91-air guide hole; 92-exhaust hole; 10-constant temperature device; 14-extrusion mold sleeve. DETAILED DESCRIPTION

[0041] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention. Example

[0042] The present invention provides a high-strength weather-resistant insulating optical unit preparation process, and the specific steps are as follows:

[0043] S1, the component mixture required for preparing the high-strength weather-resistant insulating sleeve 13 is stirred by a stirrer at 10-20 rpm for 10-20 minutes to make the various materials in the mixture evenly mixed;

[0044] S2, drying the uniformly mixed mixture in a drying furnace at a temperature of 100-200° C. for 4-8 hours, and feeding the dried mixed material into the hopper of the extruder 4;

[0045] S3, setting the screw chamber temperature of the extruder at 340-410°C, and the head temperature of the extruder at 350-450°C;

[0046] S4, heating the fiber paste 12 to 80-200° C. using the fiber paste heating conduit 72;

[0047] S5, introducing the optical fiber 11 into the optical fiber paste collection introduction tube 7 through the fiber guide tube 6, and introducing it together with the heated fiber paste 12 into the extruded high-strength weather-resistant insulating sleeve 13;

[0048] S6, using the constant temperature device 10 to heat the temperature of the shaping device 9 to 50-200° C.; the constant temperature device 10 can preheat and cool the shaping device 9 to keep the shaping device 9 in a stable temperature range;

[0049] S7, when the high-strength weather-resistant insulating sleeve is inserted into the second through hole of the shaping device 9, the high-strength weather-resistant insulating sleeve 13 undergoes continuous cooling and crystallization in the shaping device 9, and when the high-strength weather-resistant insulating sleeve 3 cools and shrinks, the optical fiber 11 is squeezed into a non-linear state;

[0050] S8. Use a vacuum pump to evacuate the vacuum hole 92 of the shaping device 9, and form a negative pressure in the shaping device 9 through the air guide hole 91, so as to control the outer diameter of the high-strength weather-resistant insulating sleeve 13 that has been extruded, thereby achieving the shaping of the high-strength weather-resistant insulating sleeve 13 and preparing a high-strength weather-resistant insulating optical unit with a stable outer diameter and high crystallinity.

[0051] In normal production in this embodiment, the temperature of the shaping device 9 is set within the temperature range of 50 to 200°C. This ensures that the high-strength weather-resistant insulating sleeve 13 extruded by the extrusion die 8 will not be immediately cooled down when it contacts the shaping device 9. In this embodiment, the thermostatic device 10 preferably controls the shaping device 9 to be at 100°C as the optimal cooling temperature. The shaping device 9 gradually cools down to form a well-crystallized high-strength weather-resistant insulating sleeve 13. After the optical fiber 11 and the fiber paste 12 are introduced into the extruded high-strength weather-resistant insulating sleeve 13, they are cooled and crystallized in the shaping device 9. The high-strength weather-resistant insulating sleeve 13 will cool and shrink, so that the optical fiber 11 will be in a spiral bending or wavy non-linear state in the high-strength weather-resistant insulating sleeve 13 after cooling and crystallization. After the optical unit 1 is compounded with the overhead power transmission cable, when it is used, since the overhead power transmission cable is erected on the iron tower, the cable will creep and elongate after long-term use. The optical fiber 11 in the optical unit 1 will be in a spiral bending or wavy non-linear state, which gradually offsets the elongation of the cable. During the service life, the optical fiber 11 in the weather-resistant insulating optical unit 1 is not subject to tensile stress, thereby extending the service life of the optical cable. Example

[0052] like Figure 1 and 2 As shown, the present invention provides a preparation device for a high-strength weather-resistant insulating optical unit, comprising: an extrusion mold 8, which is fixed in an extruder 4 by a centering fixture 5 and an extrusion mold sleeve 14; a shaping device 9, which is arranged on the outside of the extruder 4 and is arranged opposite to the extrusion mold sleeve 14, the shaping device 9 and the extrusion mold 8 are arranged on the same horizontal line, and a constant temperature device 10 is arranged on the outside of the shaping device 9 for preheating or cooling the shaping device 9; an optical fiber paste convergence introduction tube 7, which is inserted into the centering fixture 5 and the extrusion mold 8, and is used to wrap the fiber paste 2 on the outside of the optical fiber 11; a through hole 1 is provided in the center of the optical fiber paste convergence introduction tube 7, and a fiber paste introduction port connected to the through hole 1 is provided on the optical fiber paste convergence introduction tube 7; a fiber guide tube 6, which is arranged in the through hole 1 of the optical fiber paste convergence introduction tube 7, and one end of the fiber guide tube 6 is connected to the tail of the optical fiber paste convergence introduction tube 7.

[0053] Preferably, the tail of the optical fiber paste convergence introduction tube 7 is provided with an internal threaded mounting hole, and the tail of the fiber guide tube 6 is provided with an external thread that can be connected and fixed with the internal threaded mounting hole at the tail of the optical fiber paste convergence introduction tube 7. When the fiber guide tube 6 penetrates into the interior of the optical fiber paste convergence introduction tube 7, the head end of the fiber guide tube 6 exceeds the position of the fiber paste introduction port 71 of the optical fiber paste convergence introduction tube 7.

[0054] Furthermore, a fiber paste heating conduit 72 is provided on the fiber paste inlet 71, and the fiber paste heating conduit 72 is connected to the fiber paste filling machine. In actual production, the optical fiber is introduced from the tail end of the fiber guide tube 6, and the fiber paste 12 is heated from the fiber paste heating conduit 32 of the optical fiber fiber paste convergence inlet tube 7 and then introduced from the fiber paste inlet 31, and is introduced into the extrusion die 8 together with the optical fiber 11 through the head end of the optical fiber fiber paste convergence inlet tube 7, so as to extrude the high-strength weather-resistant insulating sleeve 13; after the fiber paste heating conduit 72 heats the fiber paste 12, the fluidity of the fiber paste 12 is improved, and at the same time, the low-temperature fiber paste 12 is prevented from contacting the extruded high-strength weather-resistant insulating sleeve 13, and the extruded high-strength weather-resistant insulating sleeve 13 is suddenly cooled and cannot be normally crystallized, resulting in a decrease in the performance of the high-strength weather-resistant insulating sleeve 13.

[0055] Preferably, the diameter of the through hole 1 gradually decreases from the fiber paste inlet 71 toward the extrusion die 8 .

[0056] like Figure 3 As shown, in this embodiment, the center position of the shaping device 9 has a through hole 2, and a plurality of air guide holes 91 are arranged around the through hole 2 and are connected to the through hole 2, and the air guide holes 91 are arranged vertically to the through hole 2, and the air guide holes 91 are connected to the air pump 92 through the gas channel, and the air pump 92 is connected to an external air pump. The high-strength weather-resistant insulating sleeve 13 is extruded by the extrusion die 8 and is pressed against the inner wall of the through hole 2 in the center of the shaping device 9 under the negative pressure, so that the outer diameter of the high-strength weather-resistant insulating sleeve 13 is round, stable and consistent.

[0057] like Figure 4 As shown, the centering and fixing device 5 includes a base 51 and a conical positioning sleeve 52 integrally formed with the base 51, and the conical positioning sleeve 52 is provided with a positioning cavity 1 adapted to the extrusion mold 8 and a positioning cavity 2 adapted to the end of the optical fiber paste convergence introduction tube 7. Example

[0058] Reference Figure 5As shown, the optical unit 1 is prepared by the high-strength weather-resistant insulating optical unit preparation process in Example 1, and the optical unit 1 includes an optical fiber 11, a fiber paste 12, and a high-strength weather-resistant insulating sleeve 13; the optical fiber 11 is spirally inserted into the high-strength weather-resistant insulating sleeve 13, and the fiber paste 12 is filled between the optical fiber 11 and the high-strength weather-resistant insulating sleeve 13; wherein the high-strength weather-resistant insulating sleeve 13 includes the following components by mass percentage:

[0059] Crystalline aromatic thermoplastic polymer 80% to 99.5%;

[0060] Aromatic heterocyclic polymer compounds 0-20%;

[0061] Carbon black 0-10%;

[0062] Antioxidant 0-5%.

[0063] Among them, the crystalline aromatic thermoplastic polymer is one or more of polyetheretherketone (PEEK), polyetherketone (PEK), polyetherketoneketone (PEKK), polyetheretherketoneketone (PEEKK) or polyetherketoneetherketoneketone (PEKEKK); the aromatic heterocyclic polymer compound is one or more of polyimide (PI), polyamide-imide (PAI) or polyetherimide (PEI).

[0064] In this embodiment, the crystalline aromatic thermoplastic polymer is polyetheretherketone (PEEK). The aromatic heterocyclic polymer compound is polyimide (PI). Example

[0065] The present invention also provides a composite cable, including the optical unit 1 in the third embodiment, wherein the optical unit 1 is co-twisted with a conductive metal wire, and can perform power transmission and optical fiber communication. In practical application, it can be combined with the cables of the power grid ground wire and the conductor to form an optoelectronic composite cable, which meets the needs of long-term outdoor wiring and realizes multiple functions of power transmission and optical fiber communication. Specific models include but are not limited to insulated optical unit composite ground wire (IOPGW), insulated optical unit composite conductor (IOPPC), such as Figure 6 As shown, a cross-sectional view of two insulated optical unit composite ground wires (IOPGW) with different structures is shown, both of which wrap a first metal wire 2c on the outside of the optical unit 1, and the first metal wire 2c is an aluminum-clad steel wire or a galvanized steel wire; Figure 7As shown, cross-sectional views of insulated optical unit composite conductors (IOPPC) of various different structures are shown, wherein a second metal wire or a combination of a second metal wire and a third metal wire is wrapped on the outside of an optical unit 1, wherein the second metal wire 2a is an aluminum wire, a copper wire, an aluminum alloy wire or a copper alloy wire; the third metal wire 2b is an aluminum-clad steel wire, a galvanized steel wire or an aluminum-clad invar steel wire, and the combination of the second metal wire 2a and the third metal wire 2b is twisted on the outside of the optical unit, which helps to enhance the conductivity and strength of the composite cable.

[0066] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.

Claims

1. A process for preparing a high-strength weather-resistant insulating optical unit, characterized in that: S1. Stir and mix the component mixture required for preparing the high-strength weather-resistant insulating sleeve evenly; S2, drying the uniformly mixed mixture in a drying furnace at a temperature of 100-200° C. for 4-8 hours, and feeding the dried mixed material into a hopper of an extruder; S3, setting the screw chamber temperature of the extruder at 340-410°C, and the head temperature of the extruder at 350-450°C; S4, heating the fiber paste to 80-200°C; S5, introducing the optical fiber and the heated fiber paste into an extruded high-strength weather-resistant insulating sleeve; S6. Constant temperature cooling and shaping of the optical fiber, fiber paste and high-strength weather-resistant insulating sleeve, with the temperature set at 50-200°C; S7. The high-strength weather-resistant insulating sleeve shrinks during constant temperature cooling and shaping, and the optical fiber is squeezed into a non-straight state; S8. When the high-strength weather-resistant insulating sleeve cools and shrinks, negative pressure is formed around the high-strength weather-resistant insulating sleeve by exhausting air, and the outer diameter of the high-strength weather-resistant insulating sleeve that has been extruded is controlled to achieve the shaping of the high-strength weather-resistant insulating sleeve.

2. A device for preparing a high-strength weather-resistant insulating light unit, applied to the high-strength weather-resistant insulating light unit preparation process described in claim 1, characterized in that: include: An extrusion die, which is fixed in the extruder through a centering fixture and an extrusion die sleeve; A shaping device is arranged outside the extruder and opposite to the extrusion die sleeve. The shaping device and the extrusion die are arranged on the same horizontal line. A constant temperature device is arranged on the outside of the shaping device for preheating or cooling the shaping device. An optical fiber paste convergence introduction tube, which is inserted into the interior of the centering fixture and the extrusion mold and is used to wrap the paste around the outside of the optical fiber; a through hole 1 is provided at the center of the optical fiber paste convergence introduction tube, and an optical fiber paste introduction port connected to the through hole 1 is provided on the optical fiber paste convergence introduction tube; A fiber guide tube, which is arranged in the through hole 1 of the optical fiber paste convergence introduction tube, and one end of the fiber guide tube is connected to the tail of the optical fiber paste convergence introduction tube; The fiber paste inlet is also provided with a fiber paste heating conduit, and the fiber paste heating conduit is connected to the fiber paste filling machine; The diameter of the through hole 1 gradually decreases from the fiber paste inlet toward the extrusion die; The center of the shaping device is provided with a second through hole, and a plurality of air guide holes penetrating the second through hole are arranged around the second through hole, and the air guide holes are arranged perpendicular to the second through hole, the air guide holes are connected to the air extraction holes through the gas channel, and the air extraction holes are connected to an external air extraction pump; The centering and fixing device comprises a base and a conical positioning sleeve integrally formed with the base, wherein the conical positioning sleeve is provided with a first positioning cavity adapted to the extrusion mold and a second positioning cavity adapted to the end of the optical fiber paste convergence introduction tube.

3. A light unit, prepared by the high-strength weather-resistant insulating light unit preparation process according to claim 1, characterized in that: The optical unit comprises an optical fiber, a fiber paste and a high-strength weather-resistant insulating sleeve; the optical fiber is inserted into the interior of the high-strength weather-resistant insulating sleeve in a non-linear state, and the fiber paste is filled between the optical fiber and the high-strength weather-resistant insulating sleeve, wherein the high-strength weather-resistant insulating sleeve comprises the following components by mass percentage: Crystalline aromatic thermoplastic polymer 80% to 99.5%; Aromatic heterocyclic polymer compounds 0-20%; Carbon black 0-10%; Antioxidant 0-5%.

4. The optical unit according to claim 3, characterized in that: The crystalline aromatic thermoplastic polymer is one or more of polyetheretherketone (PEEK), polyetherketone (PEK), polyetherketoneketone (PEKK), polyetheretherketoneketone (PEEKK) or polyetherketoneetherketoneketone (PEKEKK).

5. The optical unit according to claim 4, characterized in that: The aromatic heterocyclic polymer compound is one or more of polyimide (PI), polyamide-imide (PAI) or polyetherimide (PEI).

6. A composite cable, characterized in that: The optical unit comprises the optical unit as claimed in claim 5, wherein the optical unit is co-twisted with a conductive metal wire and is capable of power transmission and optical fiber communication.

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