CN107731348B - Manufacturing process for capacity-expanding optical fiber composite cable - Google Patents

Abstract

The invention discloses a manufacturing process for an expansion optical fiber composite cable, which comprises the steps of adding 100 parts of ultra-high molecular weight polyethylene resin, 20-35 parts of low-density polyethylene resin, 10-15 parts of polyether TPU, 20-30 parts of poly-p-benzamide, 18-25 parts of epoxy butyl oleate, 15-25 parts of stearic acid and 10-15 parts of barium stearate into a high-speed mixer, stirring and mixing at the speed of 500-105 ℃ and 800rpm for 20-30min, then putting 8-12 parts of tributyl citrate, 6-10 parts of kieselguhr and 5-10 parts of maleic anhydride grafted PE into a screw double extruder, adding EVA, controlling the temperature of the melting section of the extruder at 140-175 ℃, melting and blending at the rotating speed of 400-600r/min for 10-20min, and then extruding and granulating to obtain modified EVA particles. The invention improves the aging test temperature of the composite cable optical unit sheath thermoplastic sheath material to 158 ℃ for 168 hours, the thermal resistance coefficient of the material is not less than 6.0, the oil resistance of the cable is improved, and the retention rate of the strength and the elongation at break are both more than 90% after the cable is subjected to oil-resistant aging for 4 days at 100 ℃.

Description

Manufacturing process for expanding fiber optic composite cable

technical field

The invention relates to the technical field of optical fiber composite low-voltage cables, in particular to a manufacturing process for expanding the optical fiber composite cable.

Background technique

With the needs of today's social development, cables as a single function can no longer meet the needs of residents. With the continuous improvement of the level of social informatization, smart devices are gradually moving into people's homes, which requires cables not only to have super power transmission capabilities, but also It is also required to be supplemented by more informatization missions. Although some cables have composite functions, their unreasonable structure limits the performance of related functions. Currently, heat-resistant optical units and expansion channels are added to low-voltage power cables. , using the optical unit air blowing method laid after the optical unit to expand the optical fiber. The product itself has added a heat-resistant optical unit and a pre-installed optical communication pipe in the low-voltage power cable. The main technical problems are as follows: (1) Optical fiber composite The electrical unit (insulated core) in the low-voltage cable has good physical and mechanical properties, and it is not easy to cause destructive effects on its electrical properties during the production process of each process; and the optical fiber in the optical unit is the weakest point in the composite cable. The performance of the optical unit is easily affected in the production process. For example, in the process of composite cabling of the optical and electrical units, the unreasonable structural design of the composite cable and the insufficient control accuracy of the pay-off tension may cause the optical fiber to break or the optical fiber to transmit. The performance is unqualified; (2) When the optical fiber in the ordinary optical unit is heated above 85°C, the attenuation of the optical fiber increases significantly with the gradual increase of the temperature. Through the development of special high thermal resistance thermoplastic sheath material, the power line core can effectively delay the expansion of the optical unit and the capacity. The heat conduction of the channel prolongs the temperature rise time and reduces the optical fiber transmission attenuation value of the optical unit and the expansion optical unit through the peak period of the electric wave; in addition, the special material adopts thermoplastic, which effectively reduces the cross-linking problem in the production process of the optical unit. various problems.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a manufacturing process for expanding the optical fiber composite cable, the expanded optical fiber composite cable obtained by the manufacturing process improves the temperature resistance grade of the composite cable optical unit sheath and delays the temperature conduction time, and is extruded and wrapped in the optical unit. As a protective layer, the aging test temperature of thermoplastic sheath material reaches 158 °C for 168 hours, and the thermal resistance coefficient of the material is not less than 6.0. After 4 days of oil resistance aging at 100 °C, the retention rate of strength and elongation at break are all At the same time, the twisting performance of the cable can reach more than 20 million U-bends.

In order to achieve the above-mentioned purpose, the technical scheme adopted by the present invention is: a manufacturing process for a capacity expansion optical fiber composite cable, wherein the capacity expansion optical fiber composite cable comprises a photoelectric unit, at least one ground core conductor, three power core conductors, Control wire core conductors and reserve optical channels;

The outer surface of the ground core conductor, the three power core conductors, and the control core conductor is covered with an insulating layer, the outer surface of the photoelectric unit is covered with a first heat-resistant sheath layer, and the reserved optical channel is composed of It is composed of a tensile insulating layer and a second heat-resistance sheath layer coated on the outer surface of the tensile insulating layer;

A tape layer is coated on the expandable fiber optic composite low-voltage cable, including a photoelectric unit, at least one ground core conductor, three power core conductors, control core conductors, and the outer surface of the reserved optical channel, and an outer sheath. The layer is coated on the outer surface of the tape layer;

The first heat-resistant jacket layer and the second heat-resistant jacket layer are composed of the following components:

100 parts of ultra-high molecular weight polyethylene resin,

20~35 parts of low density polyethylene resin,

20~30 parts of polyparabenzamide,

18~25 parts of epoxidized butyl oleate,

15~25 parts of stearic acid,

10~15 parts of barium stearate,

8~12 parts of tributyl citrate,

6~10 parts of diatomaceous earth,

5~10 parts of maleic anhydride grafted PE,

4~8 parts of calcium zinc heat stabilizer,

Antioxidant 2~3 parts,

5~8 parts of aminopropyl triethoxysilane;

The first heat-resistant jacket layer and the second heat-resistant jacket layer are obtained through the following steps:

Step 1. Mix 100 parts of ultra-high molecular weight polyethylene resin, 20-35 parts of low-density polyethylene resin, 10-15 parts of polyether TPU, 20-30 parts of polyparabenzamide, and 18-25 parts of epoxy butyl oleate. parts, 15-25 parts of stearic acid, and 10-15 parts of barium stearate were added to the high-speed mixer, stirred and mixed at a speed of 500-800rpm at 95-105°C for 20-30min, and then tributyl citrate 8 ~12 parts, 6-10 parts of diatomaceous earth, 5-10 parts of maleic anhydride grafted PE into the screw twin extruder, then add EVA, the temperature of the extruder melting section is controlled at 140-175 ℃, at 400-600r Melt and blend for 10-20min at a rotating speed of /min, and then extrude and granulate to obtain modified EVA particles;

Step 2, adding HDPE, EPDM, compatibilizer and the modified EVA particles obtained above into a mixing machine and mixing for 10-20 min, the temperature is 105-110 ° C, to obtain a mixed rubber;

Step 3, put into the mixed rubber prepared above, 4-8 parts of calcium zinc heat stabilizer, 2-3 parts of antioxidant, 5-8 parts of aminopropyl triethoxysilane, and 1-3 parts of thiophosphoric acid In the mixer, after mixing for 2-3min, the speed of the mixer is 150-200r/min, and the temperature is controlled at 90-105℃;

Step 4. The mixed material obtained after banburying is transported into the screw extruder for extrusion processing through double cone shearing. The temperature of the body during extrusion is 140 ± 10 ° C, the temperature of the head is 110 ± 10 ° C, and the extrusion process is carried out. Then, it is vulcanized on a flat vulcanizer, hot-pressed at 160-180°C for 8-10min, cold-pressed at room temperature for 4-6min, vulcanization pressure of 6-10MPa, and outlet speed of 12-15m/min, so as to obtain the first heat-resistant sheath layer (7) and the cable material of the second heat-resistant sheath layer (9).

The technical solutions further improved by the above technical solutions are as follows:

1. In the above scheme, the antioxidant is at least one of antioxidant 1010, antioxidant DLTP and antioxidant DSTP.

2. In the above solution, several filler strips are arranged between the tape layer and the photoelectric unit, at least one ground wire core conductor, three power wire core conductors, control wire core conductors and reserved optical channels.

Due to the application of the above-mentioned technical solutions, the present invention has the following advantages compared with the prior art:

1. The present invention is a novel manufacturing process for expanding the capacity of optical fiber composite cable, which adopts 100 parts of ultra-high molecular weight polyethylene resin, 20 to 35 parts of low density polyethylene resin, 20 to 30 parts of polyparabenzamide, and 6 parts of diatomaceous earth. ~10 parts, which improves the temperature resistance grade and delays the temperature conduction time of the sheath of the composite cable optical unit. It is extruded outside the optical unit as a sheath. The aging test temperature of the thermoplastic sheath material reaches 158 ° C for 168 hours, and the thermal resistance of the material is 168 hours. The coefficient is not less than 6.0, which satisfies that the attenuation of the optical fiber of the power cable is not more than 0.15db in the environment exceeding the maximum working 10%; 20-30 parts of benzamide and 6-10 parts of diatomaceous earth were further added with 8-12 parts of tributyl citrate and 5-8 parts of aminopropyltriethoxysilane, and the aging test temperature of the thermoplastic sheath material reached 158 At ℃, the change rate of tensile strength and elongation at break are not more than ±20%.

2. The novel manufacturing process of the present invention is used for expanding the capacity of the optical fiber composite cable. It further adds 10-15 parts of polyether TPU and 1-3 parts of thiophosphoric acid to improve the oil resistance of the cable, which can be aged at 100°C for 4 days , the retention rate of strength and elongation at break are both above 90%, and the twisting performance of the cable can reach more than 20 million times of U-bend, and more than 10 million times of twisting and bending at 180 °C.

Description of drawings

FIG. 1 is a schematic structural diagram of a capacity-expanding optical fiber composite cable according to the present invention.

In the above drawings: 1, photoelectric unit; 2, ground core conductor; 3, power core conductor; 4, control core conductor; 5, reserved optical channel; 6, insulating layer; 7, first heat resistance protection jacket layer; 8. tensile insulating layer; 9. second heat-resistant jacket layer; 10, wrapping layer; 11, outer jacket layer; 12, filler strip.

Detailed ways

Embodiments 1 to 4: a manufacturing process for a capacity-expanding optical fiber composite cable, the capacity-expanding optical fiber composite cable comprising a photoelectric unit 1, at least one ground core conductor 2, three power core conductors 3, and a control core conductor 4 and reserved optical channel 5;

The outer surface of the ground core conductor 2, the three power core conductors 3 and the control core conductor 4 is covered with an insulating layer 6, and the outer surface of the photoelectric unit 1 is covered with a first heat resistance sheath layer 7, so The reserved optical channel 5 is composed of a tensile insulating layer 8 and a second heat-resistant jacket layer 9 wrapped on the outer surface of the tensile insulating layer 8;

A tape layer 10 is wrapped around the expandable fiber optic composite low-voltage cable, including the photoelectric unit 1 , at least one ground core conductor 2 , three power core conductors 3 , control core conductors 4 and reserved optical channels 5 . On the surface, an outer sheath layer 11 covers the outer surface of the tape layer 10;

The first heat-resistant jacket layer 7 and the second heat-resistant jacket layer 9 are composed of the following components:

Table 1

The first heat-resistant jacket layer 7 and the second heat-resistant jacket layer 9 are obtained through the following steps:

Step 1. Mix 100 parts of ultra-high molecular weight polyethylene resin, 20-35 parts of low-density polyethylene resin, 10-15 parts of polyether TPU, 20-30 parts of polyparabenzamide, and 18-25 parts of epoxy butyl oleate. parts, 15-25 parts of stearic acid, and 10-15 parts of barium stearate were added to the high-speed mixer, stirred and mixed at a speed of 500-800rpm at 95-105°C for 20-30min, and then tributyl citrate 8 ~12 parts, 6-10 parts of diatomaceous earth, 5-10 parts of maleic anhydride grafted PE into the screw twin extruder, then add EVA, the temperature of the extruder melting section is controlled at 140-175 ℃, at 400-600r Melt and blend for 10-20min at a rotating speed of /min, and then extrude and granulate to obtain modified EVA particles;

Step 2, adding HDPE, EPDM, compatibilizer and the modified EVA particles obtained above into a mixing machine and mixing for 10-20 min, the temperature is 105-110 ° C, to obtain a mixed rubber;

Step 3, put into the mixed rubber prepared above, 4-8 parts of calcium zinc heat stabilizer, 2-3 parts of antioxidant, 5-8 parts of aminopropyl triethoxysilane, and 1-3 parts of thiophosphoric acid In the mixer, after mixing for 2-3min, the speed of the mixer is 150-200r/min, and the temperature is controlled at 90-105℃;

Step 4. The mixed material obtained after banburying is transported into the screw extruder for extrusion processing through double cone shearing. The temperature of the body during extrusion is 140 ± 10 ° C, the temperature of the head is 110 ± 10 ° C, and the extrusion process is carried out. Then, it is vulcanized on a flat vulcanizer, hot-pressed at 160-180°C for 8-10min, cold-pressed at room temperature for 4-6min, vulcanization pressure of 6-10MPa, and outlet speed of 12-15m/min, so as to obtain the first heat-resistant sheath Layer 7, and the cable material of the second heat-resistant sheath layer 9.

The above-mentioned antioxidant is at least one of antioxidant 1010, antioxidant DLTP and antioxidant DSTP.

Several filler strips 12 are arranged between the above-mentioned wrapping layer 10 and the photoelectric unit 1 , at least one ground core conductor 2 , three power core conductors 3 , control core conductors 4 and reserved optical channels 5 .

The performance test data of the heat-resistant sheath material prepared in this example are as follows:

Table 2 Performance index of heat-resistant sheath layer of optical fiber composite low-voltage cable

When the above-mentioned manufacturing process for expanding the optical fiber composite cable is used, 100 parts of ultra-high molecular weight polyethylene resin, 20-35 parts of low-density polyethylene resin, 20-30 parts of polyparabenzamide, and 6-10 parts of diatomaceous earth are used. It improves the temperature resistance grade and delays the temperature conduction time of the sheath of the optical unit of the composite cable. It is extruded outside the optical unit as a sheath. The aging test temperature of the thermoplastic sheath material reaches 158 ° C for 168 hours, and the thermal resistance coefficient of the material is not Less than 6.0, the attenuation of the optical fiber is not more than 0.15db when the power cable exceeds 10% of the maximum working environment; secondly, it is based on 100 parts of ultra-high molecular weight polyethylene resin, 20~35 parts of low-density polyethylene resin, and polyparaben 20-30 parts of amide, 6-10 parts of diatomaceous earth, 8-12 parts of tributyl citrate and 5-8 parts of aminopropyl triethoxysilane were further added, and the aging test temperature of the thermoplastic sheath material reached 158 ℃ , the change rate of tensile strength and the change rate of elongation at break are not more than ±20%; again, it further adds 10~15 parts of polyether TPU and 1~3 parts of thiophosphoric acid to improve the oil resistance of the cable, which can be used in 100 After 4 days of oil-resistant aging at ℃, the retention rate of strength and elongation at break are both above 90%, and the twisting performance of the cable can reach more than 20 million times of U-bend, and more than 10 million times of twisting and bending at 180℃.

The above-mentioned embodiments are only intended to illustrate the technical concept and characteristics of the present invention, and the purpose thereof is to enable those who are familiar with the art to understand the content of the present invention and implement them accordingly, and cannot limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be included within the protection scope of the present invention.

Claims (3)

1. A manufacturing process for a capacity-expansion optical fiber composite cable is characterized by comprising the following steps: the capacity-expansion optical fiber composite 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 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);

the expandable optical fiber 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 the outer surface of a reserved optical channel (5), wherein a wrapping layer (10) 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 ultra-high molecular weight polyethylene resin,

20 to 35 parts of low-density polyethylene resin,

10-15 parts of polyether type TPU,

20-30 parts of poly-p-benzamide,

18-25 parts of epoxy butyl oleate,

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,

1-3 parts of thiophosphoric acid;

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 ultra-high molecular weight polyethylene resin, 20-35 parts of low density polyethylene resin, 10-15 parts of polyether TPU, 20-30 parts of poly-p-benzamide, 18-25 parts of epoxy butyl oleate, 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 800rpm for 20-30min, then putting 8-12 parts of tributyl citrate, 6-10 parts of kieselguhr 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, 5-8 parts of aminopropyl triethoxysilane and 1-3 parts of thiophosphoric acid into an internal mixer, mixing for 2-3min, controlling the rotation speed of the internal mixer at 150-200r/min and controlling the temperature at 90-105 ℃;

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 is carried out on a flat vulcanizing machine after extrusion, hot pressing is carried out for 8-10min at the temperature of 160-plus-180 ℃, cold pressing is carried out for 4-6min at normal temperature, the vulcanizing pressure is 6-10MPa, and the wire outlet speed is 12-15m/min, so that the cable material of the first heat-resistant sheath layer (7) and the second heat-resistant sheath layer (9) is obtained.

2. The process of claim 1, wherein: the antioxidant is at least one of antioxidant 1010, antioxidant DLTP and antioxidant DSTP.

3. The process of 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).

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