Radiation resistant optical cable

Abstract

The present invention provides a radiation-resistant optical cable. The radiation-resistant optical cable comprises a cable core (1), the cable core (1) comprises an optical unit (8), the optical unit (8) comprises an optical fiber (81) and a first composite layer (2), the first composite layer (2) is coated on the outside of the optical fiber (81), the first composite layer (2) comprises a first plastic layer (21) and a boron carbide protective layer (22), the first plastic layer (21) coats the outer surface of the optical fiber (81), and the boron carbide protective layer (22) coats the outer surface of the first plastic layer (21). The radiation-resistant optical cable according to the present invention can improve the comprehensive performance of the radiation-resistant optical cable in terms of flame retardancy, radiation resistance, and hydrolysis resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of optical cable protection, and in particular to a radiation-resistant optical cable. Background Art

[0002] With the development of science and technology, human beings are increasingly conducting research and application in the fields of nuclear energy, aerospace, and military. These fields are often accompanied by high radiation environments. Traditional optical cables are easily damaged in high radiation environments, which affects the communication quality between devices in high radiation environments. Therefore, an optical cable with good radiation resistance is needed to ensure stable communication in high radiation environments. Radiation-resistant optical cables came into being.

[0003] However, in extreme scenarios with high radiation, such as nuclear accidents, higher requirements are placed on the comprehensive performance of radiation-resistant optical cables. Radiation-resistant optical cables need to have radiation resistance that can withstand a large amount of radiation in an instant to reduce the aging of the cable core caused by radiation. At the same time, they must have good flame retardancy so that they can maintain effective communication of equipment and systems in a high-temperature combustion environment. In addition, they need to have good water-blocking ability to prevent moisture from penetrating into the cable and damaging the cable core. Existing radiation-resistant optical cables usually wrap the cable core in a layer-by-layer manner of flame-retardant, radiation-resistant and hydrolysis-resistant materials to give the optical cable corresponding protective performance. However, this type of protection is relatively simple in the structural design and material selection of each layer, resulting in the existing radiation-resistant optical cables having poor comprehensive flame retardancy, radiation resistance and hydrolysis resistance. Summary of the invention

[0004] The main purpose of the present invention is to provide a radiation-resistant optical cable, which can solve the problem that the existing radiation-resistant optical cable has a single protective layer structure design and a single protective material selection, thereby resulting in poor comprehensive flame retardancy, radiation resistance and hydrolysis resistance of the existing radiation-resistant optical cable.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided a radiation-resistant optical cable, comprising a cable core, the cable core comprising an optical unit, the optical unit comprising an optical fiber and a first composite layer, the first composite layer being coated on the outside of the optical fiber, the first composite layer comprising a first plastic layer and a boron carbide protective layer, the first plastic layer coating the outer surface of the optical fiber, and the boron carbide protective layer coating the outer surface of the first plastic layer.

[0006] Furthermore, the first composite layer also includes a second plastic layer, and the second plastic layer is coated outside the boron carbide protective layer.

[0007] Furthermore, the boron carbide protective layer includes a boron carbide tape, the boron carbide tape includes a flexible substrate and boron carbide powder, and the flexible substrate covers the boron carbide powder on the outer surface of the first plastic layer.

[0008] Furthermore, the boron carbide protective layer includes a boron carbide coating, which contains boron carbide powder. The boron carbide powder has a particle size between 60 and 500 nm. The boron carbide powder is sprayed to cover the outer surface of the first plastic layer to form a boron carbide coating. The thickness of the boron carbide coating is between 200 and 1000 nm.

[0009] Furthermore, the optical unit also includes a buffer layer, which is wrapped around the optical fiber and located between the optical fiber and the first composite layer. The buffer layer has boron carbide microcapsules embedded therein, and the boron carbide microcapsules are dispersed in the buffer layer.

[0010] Furthermore, the boron carbide microcapsule is spherical or elliptical, the size of the boron carbide microcapsule is between 1 and 100 μm, and the boron carbide particles are contained inside the boron carbide microcapsule, and the particle size of the boron carbide particles is between 60 and 500 nm.

[0011] Furthermore, the radiation-resistant optical cable also includes a second composite layer, which is arranged outside the first composite layer. The second composite layer includes a hydrolysis-resistant film and a radiation-resistant film, and the hydrolysis-resistant film is arranged outside the radiation-resistant film on a side away from the cable core.

[0012] Furthermore, the hydrolysis-resistant film includes a first polytetrafluoroethylene film, and the radiation-resistant film includes a polyimide film. The polyimide film is arranged on a side of the second composite layer close to the cable core, and the first polytetrafluoroethylene film is arranged on a side of the second composite layer away from the cable core. The thickness of the first polytetrafluoroethylene film is between 200 and 300 μm, and the thickness of the polyimide film is between 100 and 200 μm.

[0013] Furthermore, the hydrolysis-resistant film also includes a second polytetrafluoroethylene film, the thickness of the second polytetrafluoroethylene film is between 100 and 200 μm, and the second composite layer is composed of the second polytetrafluoroethylene film, the polyimide film and the first polytetrafluoroethylene film from the inside to the outside.

[0014] Furthermore, the second composite layer also includes a fire extinguishing buffer layer, and the fire extinguishing buffer layer is arranged between the polyimide film and the first polytetrafluoroethylene film.

[0015] Furthermore, the fire extinguishing buffer layer includes a foam layer, and the foam layer is coated on the outside of the polyimide film.

[0016] Furthermore, the fire extinguishing buffer layer also includes a fire extinguishing fluid, and a receiving cavity is formed between the inner side and / or outer side of the foam layer and the polyimide film and the first polytetrafluoroethylene film, and the fire extinguishing fluid is arranged in the receiving cavity.

[0017] Furthermore, the second composite layer also includes an adsorption layer, and the adsorption layer is arranged between the second polytetrafluoroethylene film and the polyimide film.

[0018] Furthermore, the adsorption layer also includes adsorption particles. The adsorption layer has a mesh structure. The adsorption particles are arranged in the mesh intervals within the mesh structure. There are mesopores and micropores on the surface of the adsorption particles. The pore size of the mesopores is between 2 and 50 nm, and the pore size of the micropores is less than 2 nm. The thickness of the adsorption layer is between 200 and 300 μm.

[0019] Furthermore, the radiation-resistant optical cable also includes a fireproof layer, which is arranged on a side outside the second composite layer away from the cable core.

[0020] Furthermore, the radiation-resistant optical cable also includes a resin layer, which is arranged on a side outside the fireproof layer away from the cable core. The resin layer contains silicone resin, which is coated on the outer surface of the fireproof layer and forms a resin layer after curing.

[0021] The technical solution of the present invention is applied, and the optical fiber is used to transmit communication signals. The first composite layer is arranged outside the optical fiber to protect the optical fiber. The first composite layer includes a first plastic layer and a boron carbide protective layer, wherein the first plastic layer is coated on the outer surface of the optical fiber, which can effectively block radiation and provide additional mechanical protection for the optical cable. In addition, the first plastic layer also has good waterproof and moisture-proof properties; the boron carbide protective layer contains boron carbide particles. Since boron carbide has a strong absorption capacity for radiation and has excellent hardness, wear resistance, high temperature stability, flame retardancy and corrosion resistance, the boron carbide protective layer containing boron carbide particles is coated on the outer surface of the first plastic layer, which can significantly increase the radiation resistance, flame retardancy and hydrolysis resistance of the radiation-resistant optical cable. By setting the first composite layer, the protection structure design of the radiation-resistant optical cable and the diversity of the protection materials are increased, thereby improving the comprehensive performance of the radiation-resistant optical cable in terms of flame retardancy, radiation resistance and hydrolysis resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 A cross-sectional view of a radiation resistant optical cable according to one embodiment of the present invention is shown;

[0024] Figure 2 A schematic diagram showing the structure of a first composite layer of a radiation-resistant optical cable according to an embodiment of the present invention is shown;

[0025] Figure 3 A cross-sectional view of a first composite layer of a radiation resistant optical cable according to one embodiment of the present invention is shown;

[0026] Figure 4 A schematic diagram showing the structure of the second composite layer of a radiation-resistant optical cable according to an embodiment of the present invention is shown;

[0027] Figure 5 A schematic diagram showing the structure of the second composite layer of the radiation-resistant optical cable according to one embodiment of the present invention; and

[0028] Figure 6 A cross-sectional view of an optical unit and a first composite layer of a radiation-resistant optical cable according to an embodiment of the present invention is shown.

[0029] The above drawings include the following reference numerals:

[0030] 1. Cable core; 2. First composite layer; 21. First plastic layer; 22. Boron carbide protective layer; 23. Second plastic layer; 3. Filling line; 4. Second composite layer; 41. First polytetrafluoroethylene film; 42. Polyimide film; 43. Second polytetrafluoroethylene film; 44. Adsorption layer; 45. Fire extinguishing buffer layer; 451. Foam layer; 452. Fire extinguishing fluid; 46. Adsorption particles; 5. Fireproof layer; 6. Resin layer; 7. Protective layer; 8. Optical unit; 81. Optical fiber; 82. Buffer layer; 821. Boron carbide microcapsules. DETAILED DESCRIPTION

[0031] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0032] See also Figures 1 to 6 As shown, the present invention provides a radiation-resistant optical cable, including a cable core 1, the cable core 1 includes an optical unit 8, the optical unit 8 includes an optical fiber 81 and a first composite layer 2, the first composite layer 2 is coated on the outside of the optical fiber 81, the first composite layer 2 includes a first plastic layer 21 and a boron carbide protective layer 22, the first plastic layer 21 coats the outer surface of the optical fiber 81, and the boron carbide protective layer 22 coats the outer surface of the first plastic layer 21.

[0033] In this embodiment, the optical fiber 81 is used to transmit communication signals, and the first composite layer 2 is arranged outside the optical fiber 81 to protect the optical fiber 81. The first composite layer 2 includes a first plastic layer 21 and a boron carbide protective layer 22, wherein the first plastic layer 21 is coated on the outer surface of the optical fiber 81, which can effectively block radiation and provide additional mechanical protection for the optical cable. In addition, the first plastic layer 21 also has good waterproof and moisture-proof properties; the boron carbide protective layer 22 contains boron carbide particles. Since boron carbide has a strong absorption capacity for radiation and has excellent hardness, wear resistance, high temperature stability, flame retardancy and corrosion resistance, the boron carbide protective layer 22 containing boron carbide particles is coated on the outer surface of the first plastic layer 21, which can significantly increase the radiation resistance, flame retardancy and hydrolysis resistance of the radiation-resistant optical cable. By setting the first composite layer 2, the protection structure design of the radiation-resistant optical cable and the diversity of the protection materials are increased, thereby improving the comprehensive performance of the radiation-resistant optical cable in terms of flame retardancy, radiation resistance and hydrolysis resistance.

[0034] In one embodiment of the present invention, the first composite layer 2 further includes a second plastic layer 23 , and the second plastic layer 23 is coated on the outside of the boron carbide protective layer 22 .

[0035] In this embodiment, the second plastic layer 23 has good waterproof and moisture-proof properties. The boron carbide protective layer 22 is protected by wrapping the second plastic layer 23 outside the boron carbide protective layer 22 to prevent moisture from penetrating into the radiation-resistant optical cable and directly contacting the boron carbide protective layer 22, causing the boron carbide protective layer 22 to hydrolyze, thereby weakening the radiation resistance of the boron carbide protective layer 22.

[0036] In one embodiment of the present invention, the boron carbide protective layer 22 includes a boron carbide tape, which includes a flexible substrate and boron carbide powder. The flexible substrate covers the boron carbide powder on the outer surface of the first plastic layer 21, and the flexible substrate specifically includes a polyimide material or a polyester material.

[0037] In this embodiment, the boron carbide powder cannot be directly adhered to the outer surface of the first plastic layer 21. First, an electrostatic device is used to make the surface of the flexible substrate have static electricity, and the boron carbide powder is adsorbed on the surface of the flexible substrate by electrostatic adsorption. Then, the side of the flexible substrate adsorbed with the boron carbide powder is facing the first plastic layer 21, and the flexible substrate is wrapped around the outer surface of the first plastic layer 21, so that the boron carbide powder fits the first plastic layer 21. The boron carbide powder is wrapped by the flexible substrate between the first plastic layer 21 and the flexible substrate, and then the boron carbide powder is fixed outside the first plastic layer 21, thereby improving the radiation resistance of the optical cable. At the same time, the flexible substrate is used to ensure the flexibility of the optical cable.

[0038] In one embodiment of the present invention, the boron carbide protective layer 22 includes a boron carbide coating, which contains boron carbide powder. The particle size of the boron carbide powder is between 60 and 500 nm. The boron carbide powder is sprayed to cover the outer surface of the first plastic layer 21 to form a boron carbide coating. The thickness of the boron carbide coating is between 200 and 1000 nm.

[0039] In this embodiment, boron carbide powder with a particle size between 60 and 500 nm is sprayed and covered on the outer surface of the first plastic layer 21, and a boron carbide coating with a thickness between 200 and 1000 nm is formed after curing. Since boron carbide has a strong absorption capacity for radiation and has excellent hardness, wear resistance, high temperature stability, flame retardancy and corrosion resistance, the boron carbide coating can improve the comprehensive performance of the radiation-resistant optical cable, such as radiation resistance, high temperature resistance and corrosion resistance, and protect the internal optical fiber.

[0040] In one embodiment of the present invention, the optical unit 8 further includes a buffer layer 82, which is wrapped around the optical fiber 81 and located between the optical fiber 81 and the first composite layer 2. The buffer layer 82 has boron carbide microcapsules 821 built therein, and the boron carbide microcapsules 821 are dispersed in the buffer layer.

[0041] In this embodiment, the buffer layer 82 is used to reduce the impact of external force on the optical fiber 81, and lubricate the optical fiber 81, reduce the friction between the multiple optical fibers 81, and avoid the multiple optical fibers 81 from rubbing against each other and causing damage, thereby reducing the stability of communication. In addition, the buffer layer 82 is used to accommodate and fix the boron carbide microcapsules 821, which are dispersed in the buffer layer 82 to absorb the radiation passing through the first plastic layer 21, thereby protecting the optical fiber 81 and reducing the damage of the radiation to the optical fiber 81. In one embodiment of the present invention, the buffer layer 82 also includes a buffer fluid, which is mainly a viscous liquid or gel, such as ointment, silicone oil, etc., and the boron carbide microcapsules 821 are dispersed and suspended in the buffer fluid.

[0042] In this embodiment, the buffer fluid further enhances the buffering performance of the buffer layer 82 and reduces the damage to the optical fiber 81 caused by external physical impact. In addition, the buffer fluid is mainly a viscous liquid or gel, which has a good fixing effect on the boron carbide microcapsules 821, avoiding the accumulation of boron carbide microcapsules 821 in the fluid with gravity flow and uneven distribution, resulting in poor radiation absorption effect.

[0043] In one embodiment of the present invention, the boron carbide microcapsule 821 is spherical or elliptical, and the size of the boron carbide microcapsule 821 is between 1 and 100 μm. The boron carbide microcapsule 821 is filled with boron carbide particles, and the particle size of the boron carbide particles is between 60 and 500 nm.

[0044] In the present embodiment, the boron carbide microcapsules 821 gradually dissolve under specific radiation conditions, slowly releasing the boron carbide particles contained in the microcapsules, which can improve the dispersion effect of the boron carbide particles in the buffer material, make the boron carbide particles more evenly distributed and avoid agglomeration, and on the other hand, prolong the duration of the buffer layer 82's ability to absorb radiation, ensuring that the buffer layer 82 has radiation resistance for long-term absorption of radiation; the spherical boron carbide microcapsules 821 have a larger surface area to volume ratio, and thus can be exposed to more radiation, making it easier to reach the radiation conditions for dissolution and rupture; the internal stress distribution of the elliptical boron carbide microcapsules 821 is uneven, making the elliptical boron carbide microcapsules 821 more likely to rupture after reaching the temperature or radiation conditions for dissolution and rupture.

[0045] In one embodiment of the present invention, the boron carbide microcapsules 821 are made of water-soluble polymers or thermosensitive polymers or radiation-sensitive polymers, such as polyvinyl alcohol, polyethylene glycol, etc., so that the boron carbide microcapsules 821 can be degraded and broken under a temperature of 100°C or under a specific irradiation condition of 200KGy, thereby releasing the boron carbide particles contained in the microcapsules. In one embodiment of the present invention, the radiation-resistant optical cable further includes a second composite layer 4, which is disposed outside the first composite layer 2, and the second composite layer 4 includes a hydrolysis-resistant film and a radiation-resistant film, and the hydrolysis-resistant film is disposed outside the radiation-resistant film on a side away from the cable core 1.

[0046] In this embodiment, the hydrolysis-resistant film is used to enhance the hydrolysis resistance of the radiation-resistant optical cable, and the radiation-resistant film is used to enhance the radiation resistance of the radiation-resistant optical cable. The hydrolysis-resistant film is arranged on the side outside the radiation-resistant film away from the cable core 1 to prevent moisture from penetrating into the second composite layer 4 from the outside to damage the radiation-resistant film, and to prevent the radiation-resistant film from being hydrolyzed and causing a decrease in radiation resistance; the second composite layer 4 improves the comprehensive performance of the radiation-resistant optical cable, such as hydrolysis resistance and radiation resistance, through the composite effect of multiple functional layers.

[0047] In one embodiment of the present invention, the hydrolysis-resistant film includes a first polytetrafluoroethylene film 41, and the radiation-resistant film includes a polyimide film 42. The polyimide film 42 is arranged on a side of the second composite layer 4 close to the cable core 1, and the first polytetrafluoroethylene film 41 is arranged on a side of the second composite layer 4 away from the cable core 1. The thickness of the first polytetrafluoroethylene film 41 is between 200 and 300 μm, and the thickness of the polyimide film 42 is between 100 and 200 μm.

[0048] In the present embodiment, the polytetrafluoroethylene film has good hydrolysis resistance and can effectively isolate moisture. The polyimide film 42 has excellent heat resistance and high-intensity radiation resistance. The first polytetrafluoroethylene film 41 is arranged on the outside of the polyimide film 42, mainly used to isolate moisture from the outside from penetrating into the radiation-resistant optical cable, to prevent moisture from contacting the polyimide film 42 and hydrolyzing, destroying the polyimide film 42 and reducing the heat resistance and high-intensity radiation resistance of the polyimide film 42; the thickness of the first polytetrafluoroethylene film 41 is between 200 and 300 μm, so that the first polytetrafluoroethylene film 41 can not only effectively isolate moisture, but also ensure the mechanical strength and durability of the overall radiation-resistant optical cable. The thickness of the polyimide film 42 is between 100 and 200 μm, so that the polyimide film 42 has sufficient toughness while ensuring lightweight, is not easy to be damaged, and can also provide sufficient protection performance.

[0049] In one embodiment of the present invention, the hydrolysis-resistant film further comprises a second polytetrafluoroethylene film 43 having a thickness of 100-200 μm. The second composite layer 4 comprises the second polytetrafluoroethylene film 43, the polyimide film 42 and the first polytetrafluoroethylene film 41 from inside to outside.

[0050] In this embodiment, the second polytetrafluoroethylene film 43 is disposed on the inner side of the polyimide film 42 to perform secondary blocking on the gas chemical molecules that have penetrated the adsorption layer, thereby preventing the gas chemical molecules from further penetrating into the cable core 1 .

[0051] In one embodiment of the present invention, the second composite layer 4 further includes a fire extinguishing buffer layer 45 , and the fire extinguishing buffer layer 45 is disposed between the polyimide film 42 and the first polytetrafluoroethylene film 41 .

[0052] In this embodiment, the fire extinguishing buffer layer 45 is mainly used to block external high temperature in extreme scenarios of high temperature and high pressure, and to buffer the impact caused by the high temperature and high pressure of the external environment, thereby achieving the effect of protecting the optical fiber.

[0053] In one embodiment of the present invention, the fire extinguishing buffer layer 45 includes a foam layer 451 , and the foam layer 451 is coated on the outside of the polyimide film 42 .

[0054] In this embodiment, the foam layer 451 has good toughness and elasticity, and can further alleviate the direct impact caused by high temperature and high pressure.

[0055] In one embodiment of the present invention, the foam layer 451 is a flexible polyesterimide foam. On the one hand, the flexible polyesterimide foam has good toughness and elasticity. On the other hand, since the polyesterimide material has good high temperature resistance and radiation resistance, the use of flexible polyesterimide foam as the foam layer 451 can significantly improve the high temperature resistance and radiation resistance of the fire extinguishing buffer layer 45, and further protect the optical fiber so that it still has the ability to communicate stably under extreme conditions of high temperature and high pressure.

[0056] In one embodiment of the present invention, the fire extinguishing buffer layer 45 further includes a fire extinguishing fluid 452 , and a receiving cavity is formed between the inner side and / or outer side of the foam layer 451 and the polyimide film 42 and the first polytetrafluoroethylene film 41 , and the fire extinguishing fluid 452 is disposed in the receiving cavity.

[0057] In this embodiment, when the radiation-resistant optical cable is ignited by fire, the fire-extinguishing fluid 452 can extinguish the ignition point that burns to the fire-extinguishing buffer layer 45, thereby preventing the open flame from further burning into the cable core 1 and causing the optical fiber 81 to be damaged by heat; the inner and outer surfaces of the foam layer 451 are both concave surfaces, so that a receiving cavity can be formed under the wrapping of the polyimide film 42 and the first polytetrafluoroethylene film 41, and the fire-extinguishing fluid 452 can be retained between the polyimide film 42 and the first polytetrafluoroethylene film 41 through the receiving cavity.

[0058] In one embodiment of the present invention, the foam layer 451 is formed by a plurality of foam strips tightly arranged around the center of the radiation-resistant optical cable, and the cross-section of the foam strips is circular or spindle-shaped, and the outer diameter thereof is between 200 and 300 μm.

[0059] In this embodiment, a plurality of foam strips are spliced ​​and coated with the polyimide film 42 so that there is a deeper and more regularly shaped groove between two adjacent foam strips, thereby forming a larger and more evenly distributed accommodating cavity, thereby accommodating more fire extinguishing fluid 452 and making the fire extinguishing fluid 452 more evenly distributed in the fire extinguishing buffer layer 45, thereby improving the fire extinguishing effect.

[0060] In one embodiment of the present invention, the fire extinguishing fluid 452 is a gel having high temperature resistance and flame retardancy, such as fire extinguishing gel, aqueous film-forming foam fire extinguishing agent, silicone resin and other materials.

[0061] In this embodiment, materials such as fire extinguishing gel, aqueous film-forming foam fire extinguishing agent and silicone resin all have good fire extinguishing and flame retardant properties, thereby ensuring that the fire extinguishing fluid 452 has good fire extinguishing and flame retardant effects; at the same time, the gel material also has good adhesion. In the embodiment where multiple foam strips are arranged to form a foam layer 451, the use of gel material as the fire extinguishing fluid 452 can bond adjacent foam strips and improve the bonding strength between the foam strips; in addition, compared with the use of liquid as the fire extinguishing fluid 452, the fluidity of the gel material is poor. The use of gel as the fire extinguishing fluid 452 can prevent the fire extinguishing fluid 452 from flowing and deviating to the local area of ​​the radiation-resistant optical cable under the action of gravity and causing aggregation, thereby avoiding the problem of reduced fire extinguishing performance.

[0062] In one embodiment of the present invention, the second composite layer 4 further includes an adsorption layer 44 , and the adsorption layer 44 is disposed between the second polytetrafluoroethylene film 43 and the polyimide film 42 .

[0063] In this embodiment, the polyimide film 42 and the first polytetrafluoroethylene film 41 in the second composite layer 4 can block most of the moisture and macromolecular chemicals, but some small and medium-molecule chemical particles will still penetrate the above-mentioned films. The adsorption layer 44 is mainly used to adsorb the small and medium-molecule chemical particles that penetrate the polyimide film 42 and the first polytetrafluoroethylene film 41, and at the same time further enhance the radiation resistance and hydrolysis resistance of the second composite layer 4.

[0064] In one embodiment of the present invention, the adsorption layer 44 also includes adsorption particles 46. The adsorption layer 44 is a mesh structure. The adsorption particles 46 are arranged in the mesh intervals within the mesh structure. There are mesopores and micropores on the surface of the adsorption particles 46. The pore size of the mesopores is between 2 and 50 nm, and the pore size of the micropores is less than 2 nm. The thickness of the adsorption layer 44 is between 200 and 300 μm.

[0065] In the present embodiment, the mesh-structured adsorption layer 44 has mesh gaps for accommodating adsorption particles 46. The adsorption particles 46 are porous adsorption particles with mesopores and micropores on the surface, such as boride particles and activated carbon particles. The pore size of the mesopores is between 2 and 50 nm, and the pore size of the micropores is less than 2 nm. The small and medium-molecule chemical particles that penetrate the polyimide film 42 and the first polytetrafluoroethylene film 41 can be adsorbed, wherein the mesopores have a higher adsorption efficiency than the micropores, and the micropores have a better adsorption effect than the mesopores. Through the coordination of the mesopores and micropores of the adsorption particles 46, the adsorption layer 44 can quickly adsorb a variety of chemical mixtures and has a better adsorption effect on small and medium-molecule chemical particles.

[0066] In one embodiment of the present invention, the mesh adsorption layer 44 is woven with non-metallic water-blocking reinforcing yarn, such as water-blocking glass fiber yarn and water-blocking aramid yarn, which can prevent moisture from further penetrating into the interior, thereby improving the hydrolysis resistance of the radiation-resistant optical cable.

[0067] In one embodiment of the present invention, the radiation-resistant optical cable further comprises a fireproof layer 5, which is arranged on a side outside the second composite layer 4 away from the cable core 1, and the fireproof layer 5 is made of ceramic composite material.

[0068] In this embodiment, the fireproof layer 5 is used to prevent the fire from spreading to the inside of the optical cable in a fire scene. Since the ceramic composite material can maintain stable performance at high temperatures and is not easily ignited, the use of ceramic composite materials to form the fireproof layer 5 can significantly enhance the high temperature resistance and flame retardancy of the fireproof layer 5.

[0069] In one embodiment of the present invention, the radiation-resistant optical cable further comprises a resin layer 6, which is arranged on a side outside the fireproof layer 5 away from the cable core 1, and the resin layer 6 comprises a silicone resin, which is coated on the outer surface of the fireproof layer 5 and forms the resin layer 6 after curing.

[0070] In this embodiment, since the organic silicone resin has excellent ultraviolet resistance, moisture resistance, and salt spray resistance, the organic silicone resin is coated on the outer surface of the fireproof layer 5 and cured to form a resin layer 6, which can improve the ability of the optical cable to resist erosion by various environmental factors in a complex environment. At the same time, the organic silicone resin material also has good hydrolysis resistance and flame retardancy. Therefore, the resin layer 6 formed after the organic silicone resin material is cured can effectively seal the optical cable, further block moisture, and slow down the spread of fire inwards; the radiation-resistant optical cable is protected by curing the organic silicone resin to form a resin layer 6, thereby improving the comprehensive performance of the radiation-resistant optical cable; the resin layer 6 and the fireproof layer 5 together constitute the first line of defense for the radiation-resistant optical cable, providing comprehensive protection performance for the radiation-resistant optical cable. The second composite layer 4 is the second line of defense for the radiation-resistant optical cable. The fire extinguishing buffer layer 45 arranged in the second composite layer 4 can play a flame retardant and fire extinguishing effect. The first composite layer 2 is the third line of defense for the radiation-resistant optical cable. The boron carbide protective layer 22 arranged in the first composite layer 2 can further absorb radiation and block high temperature. Under the joint action of the three lines of defense, a variety of protective structures and various protective means are adopted to protect the optical fiber 81 inside the cable, thereby improving the comprehensive protection performance of the radiation-resistant optical cable.

[0071] In one embodiment of the present invention, the radiation-resistant optical cable further comprises a protective layer 7, which is arranged on a side of the resin layer 6 away from the cable core 1 and is made of materials such as polyetheretherketone and ethylene-propylene rubber.

[0072] In this embodiment, since materials such as polyetheretherketone and ethylene-propylene rubber have excellent high temperature resistance and aging resistance, and can still maintain good mechanical properties in extreme environments of high temperature and high radiation, the protective layer 7 is made of materials such as polyetheretherketone and ethylene-propylene rubber, which can significantly improve the high temperature resistance and radiation resistance of the radiation-resistant optical cable.

[0073] In one embodiment of the present invention, the radiation-resistant optical cable further includes a filling wire 3, a plurality of optical units 8 are arranged circumferentially around the center of the radiation-resistant optical cable, a plurality of cable cores 1 are arranged circumferentially to form a cavity in the center, and the filling wire 3 is filled in the cavity.

[0074] In this embodiment, a plurality of optical units 8 are twisted to form a cable core 1, thereby improving the communication capability of the radiation-resistant optical cable, and a filling wire 3 is arranged in the cavity at the twisted center of the plurality of optical units 8 to prevent the plurality of optical units 8 from moving in the cavity, thereby improving the stability of the overall structure of the cable core 1.

[0075] In one embodiment of the present invention, the filling wire 3 is made of a non-metallic material with low density, light weight and flexibility, such as low-density polyethylene and thermoplastic elastomer. On the one hand, it ensures that the filling wire 3 does not bring a burden to the cable core 1, thereby achieving the lightweight of the cable core 1. On the other hand, it enables the cable core 1 to maintain flexibility and reduce the possibility of breakage when the cable core 1 is bent.

[0076] From the above description, it can be seen that the above embodiment of the present invention achieves the following technical effects: the optical fiber 81 is used to transmit communication signals, the first composite layer 2 is arranged outside the optical fiber 81 to protect the optical fiber 81, and the first composite layer 2 includes a first plastic layer 21 and a boron carbide protective layer 22, wherein the first plastic layer 21 is coated on the outer surface of the optical fiber 81, which can effectively block radiation and provide additional mechanical protection for the optical cable. In addition, the first plastic layer 21 also has good waterproof and moisture-proof properties; the boron carbide protective layer 22 contains boron carbide particles. Since boron carbide has a strong absorption capacity for radiation and has excellent hardness, wear resistance, high temperature stability, flame retardancy and corrosion resistance, the boron carbide protective layer 22 containing boron carbide particles is coated on the outer surface of the first plastic layer 21, which can significantly increase the radiation resistance, flame retardancy and hydrolysis resistance of the radiation-resistant optical cable. By setting the first composite layer 2, the protection structure design of the radiation-resistant optical cable and the diversity of the protection materials are increased, thereby improving the comprehensive performance of the radiation-resistant optical cable in terms of flame retardancy, radiation resistance and hydrolysis resistance.

[0077] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0078] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A radiation-resistant optical cable, characterized in that: The cable core (1) comprises an optical unit (8), the optical unit (8) comprises an optical fiber (81) and a first composite layer (2), the first composite layer (2) is coated on the outside of the optical fiber (81), the first composite layer (2) comprises a first plastic layer (21) and a boron carbide protective layer (22), the first plastic layer (21) coats the outer surface of the optical fiber (81), and the boron carbide protective layer (22) coats the outer surface of the first plastic layer (21); the optical unit (8) further comprises a buffer layer (82), the buffer layer (82) is wrapped around the outside of the optical fiber (81) and is located between the optical fiber (81) and the first composite layer (2), the buffer layer (82) has boron carbide microcapsules (821) embedded therein, and the boron carbide microcapsules (821) are dispersedly arranged in the buffer layer.

2. The radiation-resistant optical cable according to claim 1, characterized in that: The first composite layer (2) further comprises a second plastic layer (23), wherein the second plastic layer (23) is coated outside the boron carbide protective layer (22).

3. The radiation-resistant optical cable according to claim 2, characterized in that: The boron carbide protective layer (22) comprises a boron carbide tape, the boron carbide tape comprises a flexible substrate and boron carbide powder, and the flexible substrate coats the boron carbide powder on the outer surface of the first plastic layer (21).

4. The radiation-resistant optical cable according to claim 1, characterized in that: The boron carbide protective layer (22) comprises a boron carbide coating, the boron carbide coating comprises boron carbide powder, the boron carbide powder has a particle size between 60 and 500 nm, the boron carbide powder is sprayed to cover the outer surface of the first plastic layer (21) to form the boron carbide coating, and the boron carbide coating has a thickness between 200 and 1000 nm.

5. The radiation-resistant optical cable according to claim 1, characterized in that: The boron carbide microcapsule (821) is spherical or elliptical, and the size of the boron carbide microcapsule (821) is between 1 and 100 μm. The boron carbide microcapsule (821) contains boron carbide particles, and the particle size of the boron carbide particles is between 60 and 500 nm.

6. The radiation-resistant optical cable according to claim 1, characterized in that: The boron carbide microcapsule (821) is made of a water-soluble polymer, a thermosensitive polymer, or a radiation-sensitive polymer. The boron carbide microcapsule (821) degrades and ruptures under a temperature condition of 80 to 120° C. or under an irradiation condition of 180 to 220 KGy.

7. The radiation-resistant optical cable according to any one of claims 1 to 6, characterized in that: The radiation-resistant optical cable further comprises a second composite layer (4), the second composite layer (4) being arranged outside the first composite layer (2), the second composite layer (4) comprising a hydrolysis-resistant film and a radiation-resistant film, the hydrolysis-resistant film being arranged outside the radiation-resistant film on a side away from the cable core (1).

8. The radiation-resistant optical cable according to claim 7, characterized in that: The hydrolysis-resistant film comprises a first polytetrafluoroethylene film (41), and the radiation-resistant film comprises a polyimide film (42); the polyimide film (42) is arranged on a side of the second composite layer (4) close to the cable core (1), and the first polytetrafluoroethylene film (41) is arranged on a side of the second composite layer (4) away from the cable core (1); the thickness of the first polytetrafluoroethylene film (41) is between 200 and 300 μm, and the thickness of the polyimide film (42) is between 100 and 200 μm.

9. The radiation-resistant optical cable according to claim 8, characterized in that: The hydrolysis-resistant film further comprises a second polytetrafluoroethylene film (43), the thickness of the second polytetrafluoroethylene film (43) being between 100 and 200 μm, and the second composite layer (4) comprises, from inside to outside, the second polytetrafluoroethylene film (43), the polyimide film (42), and the first polytetrafluoroethylene film (41).

10. The radiation-resistant optical cable according to claim 8, characterized in that: The second composite layer (4) further comprises a fire extinguishing buffer layer (45), wherein the fire extinguishing buffer layer (45) is arranged between the polyimide film (42) and the first polytetrafluoroethylene film (41).

11. The radiation-resistant optical cable according to claim 10, characterized in that: The fire extinguishing buffer layer (45) comprises a foam layer (451), and the foam layer (451) is coated on the outside of the polyimide film (42).

12. The radiation-resistant optical cable according to claim 11, characterized in that: The fire extinguishing buffer layer (45) further comprises a fire extinguishing fluid (452); an accommodation cavity is formed between the inner side and / or the outer side of the foam layer (451) and the polyimide film (42) and the first polytetrafluoroethylene film (41); and the fire extinguishing fluid (452) is arranged in the accommodation cavity.

13. The radiation-resistant optical cable according to claim 9, characterized in that: The second composite layer (4) further comprises an adsorption layer (44), wherein the adsorption layer (44) is arranged between the second polytetrafluoroethylene film (43) and the polyimide film (42).

14. The radiation-resistant optical cable according to claim 13, characterized in that: The adsorption layer (44) further comprises adsorption particles (46); the adsorption layer (44) is a mesh structure; the adsorption particles (46) are arranged in mesh intervals within the mesh structure; the adsorption particles (46) have mesopores and micropores on their surfaces; the pore diameter of the mesopores is between 2 and 50 nm; the pore diameter of the micropores is less than 2 nm; and the thickness of the adsorption layer (44) is between 200 and 300 μm.

15. The radiation-resistant optical cable according to claim 7, characterized in that: The radiation-resistant optical cable further comprises a fireproof layer (5), wherein the fireproof layer (5) is arranged outside the second composite layer (4) on a side away from the cable core (1).

16. The radiation resistant optical cable according to claim 15, characterized in that: The radiation-resistant optical cable further comprises a resin layer (6), wherein the resin layer (6) is arranged outside the fireproof layer (5) on a side away from the cable core (1), and the resin layer (6) comprises an organic silicone resin, which is coated on the outer surface of the fireproof layer (5) and forms the resin layer (6) after curing.

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