Waterproof optical cable and preparation method thereof

Abstract

The invention relates to the field of optical cables, and particularly discloses a waterproof optical cable and a preparation method thereof. The waterproof optical cable comprises an optical fiber, a shielding film, a waterproof film and an anti-ultraviolet sheath, and the anti-ultraviolet sheath comprises 3%-5% of 2-hydroxy-4-octyloxybenzophenone, 0.5%-1% of 2, 6-di-tert-butyl-4-methylphenol, 1%-2% of a heat-resistant agent, 0.5%-1% of calcium stearate, 5%-10% of calcium carbonate, 1%-2% of dihydro-2, 4, 6-trimethylbenzotriazine and the balance polyethylene. The preparation method comprises the following steps: uniformly coating the shielding film outside the optical fiber bundle to ensure seamless coverage, then coating the waterproof film on the outer layer of the shielding film to form a continuous waterproof protection layer, and then coating the uvioresistant sheath outside the waterproof film to obtain the waterproof optical cable. The waterproof optical cable has the advantages of ultraviolet aging resistance and good waterproofness.

Description

Technical Field

[0001] This application relates to the field of optical cables, and more specifically, to a waterproof optical cable and its preparation method. Background Art

[0002] As an important part of the modern communication field, since the birth of the optical fiber cable (Optical Fiber Cable), it has quickly become the main medium for information transmission with its unique advantages. Entering the 21st century, with the rapid development of the Internet and the popularization of mobile communication technology, the demand for optical fiber cables has increased sharply. China has also achieved remarkable achievements in this field. The total length of optical cable lines has been continuously growing. The gigabit optical network already has the ability to cover more than 500 million households, and the number of 5G base stations has also increased significantly. These achievements have not only promoted the rapid development of China's communication industry but also made important contributions to the progress of global communication technology.

[0003] An optical fiber cable mainly consists of optical fibers, a plastic protective sleeve, and a plastic outer skin. The basic structure of an optical fiber cable generally includes several parts such as a cable core, strengthening steel wires, fillers, and a sheath. Among them, the cable core is the core part of the optical fiber cable, composed of a certain number of optical fibers in a certain way; the strengthening steel wires are used to enhance the mechanical strength of the optical fiber cable; the fillers are used to maintain the shape and stability of the optical fiber cable; and the sheath is used to protect the entire optical fiber cable from mechanical damage, moisture, and chemical substances.

[0004] Ultraviolet rays have relatively high energy and can damage the molecular structure of the outer skin material of the optical fiber cable, resulting in material aging, hardening, and embrittlement. When exposed to strong sunlight for a long time, the outer skin of the optical fiber cable will gradually lose its original flexibility and elasticity and become fragile, making it more vulnerable to physical damage. When the waterproof layer is damaged, moisture is likely to penetrate into the optical fiber cable, damaging the optical fibers and thus affecting the transmission performance and service life of the optical fiber cable. And in the case of strong light intensity, the outer skin of the optical fiber cable will absorb a large amount of light energy and convert it into heat energy, resulting in an increase in the surface temperature. The high-temperature environment will accelerate the thermal oxidation reaction of the outer skin material of the optical fiber cable, further exacerbating the aging process. Summary of the Invention

[0005] To solve the above problems, this application provides a waterproof optical fiber cable and its preparation method.

[0006] The waterproof optical fiber cable provided by this application adopts the following technical solution: A waterproof optical fiber cable includes optical fibers, a shielding film, a waterproof film, and an anti-ultraviolet outer skin. The anti-ultraviolet outer skin includes 2-hydroxy-4-octyloxybenzophenone 3 - 5%, 2,6-di-tert-butyl-4-methylphenol 0.5 - 1%, heat-resistant agent 1 - 2%, calcium stearate 0.5 - 1%, calcium carbonate 5 - 10%, and dihydro-2,4,6-trimethylbenzotriazine 1 - 2%, and the rest is polyethylene.

[0007] By adopting the above technical solution, 2-hydroxy-4-octyloxybenzophenone and 2,6-di-tert-butyl-4-methylphenol are added to the anti-ultraviolet outer skin formula. These two components can effectively absorb and shield ultraviolet rays, reducing the direct irradiation of ultraviolet rays on the cable outer skin, thereby significantly slowing down the aging, hardening, and embrittlement processes of the outer skin material caused by ultraviolet irradiation. This extends the service life of the optical cable and improves its stability in outdoor environments. The heat-resistant agent and calcium stearate components enhance the thermal stability of the cable outer skin in high-temperature environments. They can resist the damage of the heat energy converted from ultraviolet rays to the material, slow down the rate of thermal oxidation reaction, thereby preventing the outer skin from deforming, softening, or accelerating aging at high temperatures. By integrating a waterproof film layer, this optical cable effectively blocks the possibility of moisture penetrating from the outside into the inside of the optical cable. Even when the anti-ultraviolet outer skin is accidentally damaged, the waterproof layer can further prevent moisture intrusion, protect the optical fiber from water erosion, and ensure that the transmission performance of the optical cable is not affected.

[0008] Optionally, the shielding film includes a metallized polyimide film.

[0009] Optionally, the preparation method of the metallized polyimide film is as follows: The polyimide film is passed through a plasma cleaner to remove organic contaminants and oxide layers on the surface; After cleaning, the polyimide film deposits gaseous triethylaluminum on the surface of the polyimide film through chemical vapor deposition to form a metallized layer, obtaining a metallized polyimide film.

[0010] By adopting the above technical solution, polyimide itself has excellent properties such as high strength, high modulus, high temperature resistance, and wear resistance. Through chemical vapor deposition (CVD) technology, gaseous triethylaluminum is precisely deposited on the surface of the polyimide film to form a dense metallized layer. Due to the presence of the metal layer, the metallized polyimide film can effectively shield electromagnetic waves, and its tight metal layer and polyimide substrate can also form a barrier to effectively block the intrusion of moisture and moisture.

[0011] Optionally, the surface of the metallized polyimide film is passivated.

[0012] By adopting the above technical solution, passivating the metallized polyimide film can effectively reduce the surface activity of the metallized layer and reduce the possibility of oxidation and corrosion. This process can improve the long-term stability and corrosion resistance of the shielding film, thereby enhancing the service life of the optical cable in harsh environments.

[0013] Optionally, the anti-ultraviolet outer skin component further includes 1-3% of indium tin oxide.

[0014] By adopting the above technical solution, adding indium tin oxide (ITO) to the ultraviolet-resistant outer skin can not only further enhance the ultraviolet resistance of the outer skin, but also endow the outer skin with certain electrical conductivity, reducing static electricity accumulation. This characteristic is particularly important for the application of optical cables in high electromagnetic interference environments, which can effectively reduce signal interference and improve the transmission stability of optical cables.

[0015] Optionally, the waterproof film includes a fluorocarbon-polyurethane composite film.

[0016] By adopting the above technical solution, using a fluorocarbon-polyurethane composite film as the waterproof layer can significantly improve the waterproof performance of the optical cable. Fluorocarbon materials have excellent waterproof and chemical corrosion resistance, while polyurethane provides good mechanical strength and flexibility. The combined use of the two enables the waterproof film to have sufficient toughness while maintaining excellent waterproof effects, being able to resist external physical impacts and further extending the service life of the optical cable.

[0017] Optionally, the preparation method of the fluorocarbon-polyurethane composite film is as follows: Mix a polyvinylidene fluoride solution with a mass concentration of 20% and a polyurethane solution with a mass concentration of 20% according to a mass ratio of (3 - 6):10, and stir evenly to form a composite coating solution; Use the spin coating method to evenly coat the composite coating solution on the surface of the substrate with a thickness of 100 - 300 microns, and perform thermal curing at 90 - 120 °C to obtain the fluorocarbon-polyurethane composite film.

[0018] By adopting the above technical solution, the spin coating method can precisely control the film layer thickness, resulting in good film layer uniformity, a flat and smooth surface, ensuring the waterproof and durable performance of the composite film. At the same time, the thermal curing process can further enhance the mechanical strength and chemical resistance of the film layer, enabling the optical cable to maintain a stable protective effect in extreme environments.

[0019] In a second aspect, a preparation method of a waterproof optical cable provided by this application adopts the following technical solution: Evenly wrap the shielding film around the optical fiber bundle to ensure seamless coverage, then wrap the waterproof film around the outer layer of the shielding film to form a continuous waterproof protection layer, and then wrap the ultraviolet-resistant outer skin around the waterproof film to obtain the waterproof optical cable.

[0020] By adopting the above technical solution, through this preparation method, it can ensure the tight combination of the waterproof film and the ultraviolet-resistant outer skin, making the protective structure of the optical cable progressive layer by layer and tightly seamless. Such a design greatly improves the overall waterproof and ultraviolet resistance performance of the optical cable, effectively preventing the intrusion of moisture and ultraviolet rays, extending the service life of the optical cable, and at the same time enhancing the mechanical strength of the optical cable, enabling it to maintain stable performance in harsh environments.

[0021] In summary, the present application has the following beneficial effects: 1. Due to the design of a multi-layer structure in the present application, including a shielding film, a waterproof film, and an anti-ultraviolet outer skin, this waterproof optical cable significantly improves its protection ability in harsh environments. The shielding film provides electromagnetic shielding, the waterproof film provides waterproof protection, and the anti-ultraviolet outer skin blocks the invasion of ultraviolet rays. The multi-layer protection structure ensures that the optical cable can still operate stably under harsh conditions such as high humidity and strong radiation.

[0022] 2. In the present application, a special material combination is preferably used, such as indium tin oxide, fluorocarbon-polyurethane composite film, etc., which greatly improves the anti-aging, anti-corrosion, and anti-ultraviolet abilities of the optical cable. The use of these materials effectively slows down the performance degradation of the optical cable caused by external factors and extends the overall service life of the optical cable, especially in the case of long-term exposure to outdoor environments.

[0023] 3. In the present application, advanced processes such as chemical vapor deposition and spin coating are used to ensure the uniformity and adhesion of key materials such as metallized polyimide film and fluorocarbon-polyurethane composite film. These precise manufacturing processes not only improve the protection effect of the optical cable but also ensure the consistency and reliability of the product, thus providing more stable performance in practical applications. Specific Embodiments

[0024] The following further elaborates on the present application in conjunction with embodiments. It should be specifically noted that: for those conditions not specified in the following embodiments, they are carried out according to conventional conditions or the conditions recommended by the manufacturer. Unless otherwise specified, the raw materials used in the following embodiments can all be obtained from ordinary commercial sources.

[0025] Preparation Example of Metallized Polyimide Film Preparation Example 1 Preparation of a metallized polyimide film: Select a polyimide film with a thickness of 100 microns (purchased from Xiamen Aribao New Materials arb-PI original film), ensuring that its surface has no obvious mechanical damage and contamination. Triethylaluminum is used as a precursor in the chemical vapor deposition (CVD) process, and the purity of triethylaluminum (purchased from Merck) is above 99.99%.

[0026] Place the polyimide film flat in the cleaning chamber of a plasma cleaner. Use argon gas, with a cleaning power of 150 W and a time controlled at 5 minutes. The plasma gas generates active ions under the action of a high-energy electric field, bombarding the surface of the polyimide film, effectively removing surface impurities and slightly roughening the surface to enhance the adhesion of the subsequent deposited metal layer.

[0027] Select a quartz substrate and fix the cleaned polyimide film flat on the substrate surface, ensuring that the surface of the film is flat without wrinkles or bubbles. Use a chemical vapor deposition device to place the substrate together with the fixed polyimide film into the deposition chamber. Introduce triethylaluminum gaseous precursor into the deposition chamber, with a deposition temperature of 200 °C. Control the deposition rate at 5 nm / min and the deposition thickness at 50 nm.

[0028] After deposition, gradually reduce the temperature in the deposition chamber at a rate of 2 °C / min to avoid cracking or warping caused by thermal stress of the film layer. After the temperature drops to room temperature, take out the metallized polyimide film on the substrate.

[0029] Preparation Example 2 Preparation of a metallized polyimide film: Different from Preparation Example 1, after the temperature drops to room temperature, take out the metallized polyimide film on the substrate and place it in a nitrogen environment, heat it to 150 °C, keep it warm for 40 minutes, and continuously introduce nitrogen gas on the surface of the metallized film during the heat preservation period for passivation treatment.

[0030] Preparation Example of Fluorocarbon-Polyurethane Composite Film Preparation Example 3 Preparation of a fluorocarbon-polyurethane composite film: Mix 4.5 kg of polyvinylidene fluoride solution with a mass concentration of 20% (model: Yuanye S25907) and 10 kg of polyurethane solution with a mass concentration of 20% (model: UW-1527DF) according to a mass ratio of (3 - 6):10, stir evenly to form a composite coating solution; use the spin coating method to evenly coat the composite coating solution on the substrate surface with a thickness of 200 microns, and perform thermal curing at 105 °C to obtain a fluorocarbon-polyurethane composite film.

[0031] Preparation Example 4 Preparation of a fluorocarbon-polyurethane composite film: Different from Preparation Example 3, mix 3 kg of polyvinylidene fluoride solution and 10 kg of polyurethane solution.

[0032] Preparation Example 5 Preparation of a fluorocarbon-polyurethane composite film: Different from Preparation Example 3, mix 6 kg of polyvinylidene fluoride solution and 10 kg of polyurethane solution. Examples

[0033] Example 1 Preparation method of a waterproof optical cable: Select optical fibers that meet the national standard A-level standard, arrange 12 fiber cores in sequence to form an optical fiber bundle, and use polyurethane fiber wires to wind and fix the optical fiber bundle to maintain the consistency of the fiber core arrangement and avoid twisting and overlapping.

[0034] Through a winding device, a metallized polyimide film is evenly covered outside the fiber optic bundle to form a shielding film layer with a thickness of 0.5 mm. The metallized polyimide film is prepared from Preparation Example 1.

[0035] Then, a fluorocarbon-polyurethane composite film is evenly coated on the outer layer of the metallized polyimide film to form a dense waterproof layer with a thickness controlled at 0.4 mm. The fluorocarbon-polyurethane composite film is prepared from Preparation Example 3.

[0036] In a heating and mixing device, 4 kg of 2-hydroxy-4-octyloxybenzophenone, 0.8 kg of 2,6-di-tert-butyl-4-methylphenol, 1.2 kg of bisphenol A, 0.7 kg of calcium stearate, 7 kg of calcium carbonate, 1.3 kg of dihydro-2,4,6-trimethylbenzotriazine, and 85 kg of polyethylene are fully mixed and heated to melt. The mixture is extruded through an extrusion device at an extrusion temperature of 200 °C to form a uniform ultraviolet-resistant outer skin coated on the outside of the waterproof film with a thickness of 1.5 mm. After completion, a waterproof optical cable is obtained.

[0037] Example 2 A method for preparing a waterproof optical cable: The difference from Example 1 is that in a heating and mixing device, 3 kg of 2-hydroxy-4-octyloxybenzophenone, 0.5 kg of 2,6-di-tert-butyl-4-methylphenol, 1 kg of bisphenol A, 0.5 kg of calcium stearate, 5 kg of calcium carbonate, 1 kg of dihydro-2,4,6-trimethylbenzotriazine, and 89 kg of polyethylene are fully mixed and heated to melt.

[0038] Example 3 A method for preparing a waterproof optical cable: The difference from Example 1 is that in a heating and mixing device, 5 kg of 2-hydroxy-4-octyloxybenzophenone, 1 kg of 2,6-di-tert-butyl-4-methylphenol, 2 kg of bisphenol A, 1 kg of calcium stearate, 10 kg of calcium carbonate, 2 kg of dihydro-2,4,6-trimethylbenzotriazine, and 79 kg of polyethylene are fully mixed and heated to melt.

[0039] Example 4 A method for preparing a waterproof optical cable: The difference from Example 1 is that the metallized polyimide film is prepared from Preparation Example 2.

[0040] Example 5 A method for preparing a waterproof optical cable: The difference from Example 1 is that the fluorocarbon-polyurethane composite film is prepared from Preparation Example 4.

[0041] Example 6 A method for preparing a waterproof optical cable: The difference from Example 1 is that the fluorocarbon-polyurethane composite film is prepared from Preparation Example 5.

[0042] Example 7 Preparation method of a waterproof optical cable: Different from Example 1, in a heating and mixing device, 4 kg of 2-hydroxy-4-octyloxy benzophenone, 0.8 kg of 2,6-di-tert-butyl-4-methylphenol, 1.2 kg of bisphenol A, 0.7 kg of calcium stearate, 7 kg of calcium carbonate, 1.3 kg of dihydro-2,4,6-trimethylbenzotriazine, 2 kg of indium tin oxide and 83 kg of polyethylene are fully mixed and heated to melt.

[0043] Example 8 Preparation method of a waterproof optical cable: Different from Example 7, in a heating and mixing device, 4 kg of 2-hydroxy-4-octyloxy benzophenone, 0.8 kg of 2,6-di-tert-butyl-4-methylphenol, 1.2 kg of bisphenol A, 0.7 kg of calcium stearate, 7 kg of calcium carbonate, 1.3 kg of dihydro-2,4,6-trimethylbenzotriazine, 1 kg of indium tin oxide and 84 kg of polyethylene are fully mixed and heated to melt.

[0044] Example 9 Preparation method of a waterproof optical cable: Different from Example 1, in a heating and mixing device, 4 kg of 2-hydroxy-4-octyloxy benzophenone, 0.8 kg of 2,6-di-tert-butyl-4-methylphenol, 1.2 kg of bisphenol A, 0.7 kg of calcium stearate, 7 kg of calcium carbonate, 1.3 kg of dihydro-2,4,6-trimethylbenzotriazine, 3 kg of indium tin oxide and 82 kg of polyethylene are fully mixed and heated to melt.

[0045] Comparative example Comparative example 1 Preparation method of a waterproof optical cable: Different from Example 1, the shielding film is made of polyimide film (Xiamen Airburg New Material arb-PI original film).

[0046] Comparative example 2 Preparation method of a waterproof optical cable: Different from Example 1, the waterproof layer is made of polyurethane film.

[0047] Comparative example 3 Preparation method of a waterproof optical cable: Select optical fibers that meet the national standard A-level standard. Arrange 12 fiber cores in sequence to form a fiber bundle. Use polyurethane fiber wire to wind and fix the fiber bundle to maintain the consistency of the fiber core arrangement and avoid twisting and overlapping.

[0048] Through a winding device, a fluorocarbon-polyurethane composite film is evenly coated on the outer layer of the metallized polyimide film to form a dense waterproof layer. The thickness of the waterproof layer is controlled at 0.4 mm. The fluorocarbon-polyurethane composite film is prepared from Preparation Example 3.

[0049] Then, uniformly cover the metallized polyimide film outside the fiber optic bundle to form a shielding film layer with a thickness of 0.5 mm. The metallized polyimide film is prepared according to Preparation Example 1.

[0050] In a heating and mixing device, fully mix and heat to melt 4 kg of 2-hydroxy-4-octyloxybenzophenone, 0.8 kg of 2,6-di-tert-butyl-4-methylphenol, 1.2 kg of bisphenol A, 0.7 kg of calcium stearate, 7 kg of calcium carbonate, 1.3 kg of dihydro-2,4,6-trimethylbenzotriazine, and 85 kg of polyethylene. Extrude the mixture through an extrusion device at an extrusion temperature of 200 °C to form a uniform ultraviolet-resistant outer skin coated on the outside of the waterproof film with a thickness of 1.5 mm. After completion, a waterproof optical cable is obtained. Performance detection test Detection method 1. Ultraviolet aging damage test Take a 1-meter-long optical cable sample, remove the encapsulation at both ends, and only retain the structures such as the outer skin, shielding film, and waterproof layer in the middle part.

[0051] Use an ultraviolet light aging test chamber equipped with a xenon light source and an ultraviolet fluorescent lamp tube to simulate the ultraviolet radiation in sunlight. The wavelength range of the lamp tube is between 290 nm and 400 nm. Set the ultraviolet intensity to 0.68 W / m 2 , representing the common outdoor ultraviolet intensity. Keep it at 60 °C ± 5 °C to simulate a high-temperature environment. Continuously expose for 300 hours, which is equivalent to about 3 years of outdoor ultraviolet exposure. Record the appearance changes (such as cracking and discoloration) of the sample at the end, and check the changes in the mechanical properties of the sample before and after aging.

[0052] 2. Waterproof performance test Use the same 1-meter optical cable sample as in the ultraviolet test, and seal both ends to prevent water from seeping in during the test.

[0053] Completely immerse the optical cable sample in a water tank containing 1% salt solution, set the water temperature to 40 °C ± 2 °C, and the salt water is used to simulate a more severe actual use environment. Set the soaking time to 10 days. After completion, check whether there are obvious damages on the surface of the sample, use an insulation resistance tester to measure the resistance change, and check whether the insulation performance decreases due to the failure of the waterproof layer.

[0054] Table 1 Test data Combined with Example 1 and Comparative Examples 1-3 and in conjunction with Table 1, it can be seen that polyimide itself is a material with excellent properties such as high strength, high modulus, high temperature resistance, and wear resistance. Through chemical vapor deposition (CVD) technology, gaseous triethylaluminum is precisely deposited on the surface of the polyimide film to form a dense metallization layer. Due to the presence of the metal layer, the metallized polyimide film can effectively shield electromagnetic waves, and its tight metal layer and polyimide substrate can also form a barrier to effectively block the intrusion of moisture and humidity. Using a fluorocarbon-polyurethane composite film as the waterproof layer can significantly improve the waterproof performance of the optical cable. The fluorocarbon material has excellent waterproof and chemical corrosion resistance, while polyurethane provides good mechanical strength and flexibility. By sequentially arranging the optical fiber - shielding layer - waterproof layer - ultraviolet-resistant outer skin from the inside to the outside, the protective structure of the optical cable is progressive and tightly seamless. Such a design greatly improves the overall waterproof and ultraviolet-resistant performance of the optical cable, effectively preventing the intrusion of moisture and ultraviolet rays, extending the service life of the optical cable, and at the same time enhancing the mechanical strength of the optical cable, enabling it to maintain stable performance in harsh environments.

[0055] Combined with Examples 1-3 and in conjunction with Table 1, it can be seen that 2-hydroxy-4-octyloxybenzophenone and 2,6-di-tert-butyl-4-methylphenol are added to the ultraviolet-resistant outer skin formulation. These two components can effectively absorb and shield ultraviolet rays, reducing the direct irradiation of ultraviolet rays on the outer skin of the optical cable, thereby significantly slowing down the aging, hardening, and embrittlement processes of the outer skin material caused by ultraviolet irradiation. This extends the service life of the optical cable and improves its stability in outdoor environments. The heat-resistant agent and calcium stearate components enhance the thermal stability of the optical cable outer skin in high-temperature environments. They can resist the damage of the heat energy converted from ultraviolet rays to the material, slow down the rate of thermal oxidation reaction, and thus prevent the outer skin from deforming, softening, or accelerating aging at high temperatures.

[0056] Combined with Example 1 and Examples 4-9 and in conjunction with Table 1, it can be seen that passivating the metallized polyimide film can effectively reduce the surface activity of the metallization layer and reduce the possibility of oxidation and corrosion. This process can improve the long-term stability and corrosion resistance of the shielding film, thereby enhancing the service life of the optical cable in harsh environments. Adding indium tin oxide (ITO) to the ultraviolet-resistant outer skin can further enhance the ultraviolet-resistant performance of the outer skin. By adjusting the ratio of PVDF and PU, the rigidity and flexibility of the film can be balanced, enabling the composite film to be both waterproof and have good mechanical properties.

[0057] This specific embodiment is only an interpretation of the present application and does not limit the present application. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A waterproof optical cable, characterized in that, It includes an optical fiber, a shielding film, a waterproof film, and an anti-ultraviolet outer sheath. The anti-ultraviolet outer sheath includes 2-hydroxy-4-octyloxybenzophenone 3-5%, 2,6-di-tert-butyl-4-methylphenol 0.5-1%, a heat-resistant agent 1-2%, calcium stearate 0.5-1%, calcium carbonate 5-10%, 2,4,6-trimethylbenzotriazine dihydro 1-2%, and the rest is polyethylene.

2. The waterproof optical cable according to claim 1, wherein: The shielding film includes a metallized polyimide film.

3. The waterproof optical cable according to claim 2, wherein: The preparation method of the metallized polyimide film is as follows: Remove the organic contaminants and oxide layer on the surface of the polyimide film through a plasma cleaner; Deposit gaseous triethylaluminum on the surface of the cleaned polyimide film through chemical vapor deposition to form a metallized layer, and obtain a metallized polyimide film.

4. The waterproof optical cable according to claim 2, wherein: The surface of the metallized polyimide film is passivated.

5. The waterproof optical cable according to claim 1, characterized in that: The anti-ultraviolet outer sheath component further includes indium tin oxide 1-3%.

6. The waterproof optical cable according to claim 1, wherein: The waterproof film includes a fluorocarbon-polyurethane composite film.

7. The waterproof optical cable according to claim 6, characterized in that: The preparation method of the fluorocarbon-polyurethane composite film is as follows: Mix a 20% by mass polyvinylidene fluoride solution and a 20% by mass polyurethane solution in a mass ratio of (3-6):10 to form a composite coating solution; Use a spin coating method to evenly coat the composite coating solution on the surface of the substrate with a thickness of 100-300 microns, and perform thermal curing at 90-120 °C to obtain a fluorocarbon-polyurethane composite film.

8. A method for preparing the waterproof optical cable according to any one of claims 1-7, characterized in that: Evenly wrap the shielding film outside the optical fiber bundle to ensure seamless coverage, then wrap the waterproof film outside the shielding film to form a continuous waterproof protective layer, and then wrap the anti-ultraviolet outer sheath outside the waterproof film to obtain a waterproof optical cable.

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