Environmentally friendly flame-retardant optical cable

Abstract

The utility model discloses an environmentally friendly flame-retardant optical cable, comprising a flame-retardant outer sheath, a flame-retardant coated braided layer, a water-blocking layer, a stainless steel tape cladding layer and a cable core, which are sequentially arranged from the outside to the inside. The cable core comprises a central reinforcement, a plurality of filling ropes and a plurality of optical fiber units, and the plurality of filling ropes and the plurality of optical fiber units are twisted around the central reinforcement. The flame-retardant outer sheath of the utility model is on the outermost side and is made of low-smoke halogen-free flame-retardant polyethylene, which can play multiple roles such as water-blocking, flame-retardant, and resistance to external force impact. The flame-retardant coated braided layer is made by coating MH@GNP nano-composite flame retardant on the surface of the mesh aramid fabric, which can significantly improve the flame-retardant performance of the optical cable, protect the cable core from combustion damage, ensure smooth communication in the event of a fire and during disaster relief, and avoid the expansion of disasters caused by signal interruption and data loss. At the same time, the smoke emission is small, it is environmentally friendly, the overall structure is simple, the comprehensive performance is high, and it is suitable for industrial promotion and use.

Description

Technical Field

[0001] The utility model belongs to the technical field of optical cables, and in particular relates to an environmentally friendly flame-retardant optical cable. Background Art

[0002] With the transformation of "underground overhead lines", urban pipeline resources are in short supply, and more and more communication optical cables are laid in the power trenches leased by operators, which increases safety risks. The existing flame-retardant optical cables can prevent the spread of fire when a fire occurs, but the communication function is lost. Therefore, when laying communication optical cables on the same route as power cables, they must have high-strength flame-retardant properties, and must ensure smooth communication in the event of a fire and during disaster relief to avoid the expansion of disasters caused by signal interruption and data loss. However, such optical cables have not yet appeared. Utility Model Content

[0003] In order to solve the technical problems existing in the prior art, the purpose of the utility model is to provide an environmentally friendly flame-retardant optical cable.

[0004] In order to achieve the above purpose and the above technical effect, the technical solution adopted by the utility model is:

[0005] An environmentally friendly flame-retardant optical cable comprises a flame-retardant outer sheath, a flame-retardant coated braided layer, a water-blocking layer, a stainless steel tape cladding and a cable core which are sequentially arranged from outside to inside. The cable core comprises a central reinforcement member, a plurality of filling ropes and a plurality of optical fiber units, and the plurality of filling ropes and the plurality of optical fiber units are twisted around the central reinforcement member.

[0006] Furthermore, the outer periphery of the stainless steel belt cladding forms spaced concave surfaces and convex surfaces, and a concave surface is arranged between every two convex surfaces.

[0007] Furthermore, a tear rope is provided between the water-blocking layer and the stainless steel belt cladding and in one of the concave surfaces.

[0008] Furthermore, flame retardant powder is filled between the water-blocking layer and the stainless steel belt cladding.

[0009] Furthermore, the cable core includes a central reinforcement member, three filling ropes and three optical fiber units. The central reinforcement member is located at the center of the cable core, and the three filling ropes and three optical fiber units are evenly distributed on the periphery of the central reinforcement member and twisted around the central reinforcement member.

[0010] Furthermore, one of the filling ropes is arranged between two optical fiber units, and the remaining two filling ropes are arranged adjacent to each other; one of the optical fiber units is arranged between two filling ropes, and the remaining two optical fiber units are arranged adjacent to each other.

[0011] Furthermore, the optical fiber unit comprises an optical fiber oil-filled sleeve and a plurality of optical fibers disposed inside the optical fiber oil-filled sleeve, and the optical fiber oil-filled sleeve is filled with flame-retardant gel.

[0012] Furthermore, the gaps in the cable core are filled with water-blocking cable core fillers.

[0013] Furthermore, the thickness of the flame retardant outer sheath is 1.6-3.0 mm.

[0014] Furthermore, the water-blocking layer is made of an anti-adhesion 0.1 mm PT water-blocking tape.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] The utility model discloses an environmentally friendly flame-retardant optical cable, wherein the outermost side is a flame-retardant outer sheath, which is made of low-smoke halogen-free flame-retardant polyethylene and can play multiple roles such as water-blocking, flame-retardant, and resistance to external force impact. The flame-retardant coated braided layer is located inside the flame-retardant outer sheath, and the flame-retardant coated braided layer is prepared by coating MH@GNP nano-composite flame retardant on the surface of a mesh aramid fabric. The MH@GNP nano-composite flame retardant has a good effect of inhibiting heat release, and the decomposition of the MH@GNP nano-composite flame retardant can hinder the transfer of heat, so that the cable core of the optical cable will not be damaged by high temperature, and can hinder the overflow of flammable gas, reduce the amount of smoke discharged when the optical cable burns, and is environmentally friendly. By coating the MH@GNP nano-composite flame retardant on the surface of the mesh aramid fabric, the flame-retardant performance of the optical cable can be significantly improved, the cable core can be protected from being damaged by combustion, and smooth communication can be ensured in the event of a fire and during disaster relief, and the expansion of disasters caused by signal interruption and data loss can be avoided. The overall structure is simple, the preparation process is simple, the cost is low, the comprehensive performance is high, and the utility model is suitable for industrial promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0018] The present invention is described in detail below so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0019] A brief summary of one or more aspects is given below to provide a basic understanding of these aspects. This summary is not an exhaustive overview of all conceived aspects, and is neither intended to identify the key or critical elements of all aspects nor to define the scope of any or all aspects. Its only purpose is to give some concepts of one or more aspects in a simplified form as a prelude to a more detailed description that will be given later.

[0020] like Figure 1 As shown, an environmentally friendly flame-retardant optical cable comprises a flame-retardant outer sheath 1, a flame-retardant coated braided layer 2, a water-blocking layer 3, a stainless steel tape cladding 4 and a cable core, which are arranged in sequence from the outside to the inside. The outer periphery of the stainless steel tape cladding 4 forms spaced concave and convex surfaces, a concave surface is arranged between every two convex surfaces, a tear rope 5 has one and is arranged in one of the concave surfaces, the concave surface between the water-blocking layer 3 and the stainless steel tape cladding 4 is filled with flame-retardant powder, and the flame-retardant powder is a mixture of limestone powder and glass powder in a mass ratio of 1:1. The cable core with the stainless steel tape cladding 4 adopts the water-blocking layer 3. After wrapping, a compact circular structure is formed. The cable core includes a central reinforcement member 6, several filling ropes 7 and several optical fiber units. The optical fiber unit includes an optical fiber oil-filled sleeve 8 and several optical fibers placed inside. The optical fiber oil-filled sleeve 8 is filled with flame-retardant gel. The central reinforcement member 6 is located in the center of the cable core. Several filling ropes 7 and several optical fiber units are distributed on the periphery of the central reinforcement member 6. Several filling ropes 7 and several optical fiber units are twisted around the central reinforcement member 6. The gaps in the cable core are filled with water-blocking cable core fillers 9 to prevent water seepage.

[0021] In the utility model, the stainless steel belt cladding 4 forms a whole along the circumferential direction and wraps around the outside of the cable core. It has a certain lateral pressure resistance function and is not easy to deform in a high temperature environment, effectively preventing the cable core from contacting with open flames.

[0022] In some embodiments, the cable core includes a central strength member 6, three filling ropes 7 and three optical fiber units, the three filling ropes 7 and the three optical fiber units are evenly distributed on the periphery of the central strength member 6, the three filling ropes 7 and the three optical fiber units are twisted around the central strength member 6, one of the filling ropes 7 is arranged between two optical fiber units, and the remaining two filling ropes 7 are arranged adjacent to each other, one of the optical fiber units is arranged between two filling ropes 7, and the remaining two optical fiber units are arranged adjacent to each other.

[0023] In some embodiments, the thickness of the flame retardant outer sheath 1 is 1.6-3.0 mm, and it is made of low-smoke halogen-free flame retardant polyethylene, and is used for water resistance, flame retardancy, and resistance to external impact.

[0024] In some embodiments, the flame retardant coated braided layer 2 is prepared by coating a MH@GNP nanocomposite flame retardant on a mesh aramid fabric. The MH@GNP nanocomposite flame retardant can be purchased from the market or made by yourself. If made by yourself, the preparation steps of the MH@GNP nanocomposite flame retardant include:

[0025] (1) adding light-burned magnesium and deionized water into a zirconium oxide grinding pot for ball milling to obtain a prehydrated slurry; adding the prehydrated slurry into a hydrothermal reactor for hydrothermal reaction to obtain a hydration product; drying the hydration product in an oven to obtain a product MH;

[0026] (2) GNP, MH and deionized water are mixed in a certain mass ratio to prepare the desired MH@GNP nanocomposite flame retardant.

[0027] The mesh aramid fabric has excellent flame retardant properties, high temperature resistance, chemical resistance, dimensional stability and mechanical properties. It is used as a support and coated with MH@GNP nanocomposite flame retardant, which can reduce the amount of flame retardant used. The mesh structure can increase the flame retardant reaction contact area, which can improve the flame retardant properties of the optical cable on the basis of reducing the amount of flame retardant added. The decomposition of MH@GNP nanocomposite flame retardant can hinder the transfer of heat, so that the cable core of the optical cable will not be damaged by high temperature, and can hinder the overflow of flammable gas, reduce the smoke emission when the optical cable burns, and is environmentally friendly. By coating the MH@GNP nanocomposite flame retardant on the surface of the mesh aramid fabric, it can play a good flame retardant and high temperature resistance role, protect the cable core from burning damage, ensure smooth communication in the event of a fire and during disaster relief, and avoid the expansion of disasters caused by signal interruption and data loss. When a fire occurs, the overall integrity of the residual carbon morphology after the optical cable burns is good and has a certain strength, which can maintain its own shape.

[0028] In some embodiments, the water-blocking layer 3 is made of an anti-adhesion 0.1 mm PT water-blocking tape.

[0029] In some embodiments, the optical fiber oil-filled sleeve 8 is made of a high modulus polyester material.

[0030] Example 1

[0031] like Figure 1As shown, an environmentally friendly flame-retardant optical cable comprises a flame-retardant outer sheath 1, a flame-retardant coated braided layer 2, a water-blocking layer 3, a stainless steel tape cladding 4 and a cable core, which are arranged in sequence from the outside to the inside. The outer periphery of the stainless steel tape cladding 4 forms spaced concave and convex surfaces, and a concave surface is arranged between every two convex surfaces. The stainless steel tape cladding 4 forms an integral body along the circumferential direction and is wrapped around the outside of the cable core. It has a certain lateral pressure resistance function, is not easy to deform under high temperature conditions, and effectively prevents the cable core from contacting with open flames. A tear rope 5 has one and is arranged in one of the concave surfaces. The concave surface between the water-blocking layer 3 and the stainless steel tape cladding 4 is filled with flame-retardant powder, which is a mixture of limestone powder and glass powder in a mass ratio of 1:1. The cable with the stainless steel tape cladding 4 The core is wrapped with a water-blocking layer 3 to form a compact circular structure. The cable core includes a central reinforcement member 6, three filling ropes 7 and three optical fiber units. The optical fiber unit includes an optical fiber oil-filled sleeve 8 and a plurality of optical fibers arranged therein. The optical fiber oil-filled sleeve 8 is filled with flame-retardant gel. The three filling ropes 7 and the three optical fiber units are evenly distributed on the periphery of the central reinforcement member 6. The three filling ropes 7 and the three optical fiber units are twisted around the central reinforcement member 6. One of the filling ropes 7 is arranged between two optical fiber units, and the remaining two filling ropes 7 are arranged adjacent to each other. One of the optical fiber units is arranged between two filling ropes 7, and the remaining two optical fiber units are arranged adjacent to each other. The gap in the cable core is filled with a water-blocking cable core filler 9 to prevent water seepage.

[0032] The thickness of the flame retardant outer sheath 1 is 1.6 mm, and it is made of low-smoke halogen-free flame retardant polyethylene, and is used for water blocking, flame retardancy, and resistance to external impact.

[0033] The flame retardant coated braided layer 2 is prepared by coating the MH@GNP nanocomposite flame retardant on the mesh aramid fabric. The preparation steps of the MH@GNP nanocomposite flame retardant include:

[0034] (1) 30 g of light-burned magnesium and 90 mL of deionized water were added to a zirconia grinding pot, and ball-milled at a speed of 300 r / min for 6 h to obtain a prehydrated slurry; the prehydrated slurry was added to a hydrothermal reactor, and hydrothermally reacted at 110° C. for 2 h to obtain a hydrated product; the hydrated product was dried in an oven at 100° C. for 4 h to obtain a product MH;

[0035] (2) GNP, MH and deionized water were mixed in a mass ratio of 1:20:60 to prepare the desired MH@GNP nanocomposite flame retardant, which was a two-dimensional GNP structure coated with flake MH and had a particle size of 200 nm. The reaction process had no by-products and met the low-carbon requirements of green environmental protection.

[0036] MH@GNP nanocomposite flame retardant has a good effect of inhibiting heat release, which is beneficial to improving the flame retardant properties of optical cables. Compared with pure PE materials, the peak heat release rate of PE / MH@GNP decreased by 55%, the total heat release decreased by 54%, and the dispersion problem of GNP was solved, forming a synergistic flame retardant effect with MH. MH@GNP can make the limiting oxygen index of halogen-free flame-retardant PE composite materials reach 28.2%, and the vertical burning grade reaches UL94 V-1 level.

[0037] The mesh aramid fabric has excellent flame retardant properties, high temperature resistance, chemical resistance, dimensional stability and mechanical properties. It is used as a support and coated with MH@GNP nanocomposite flame retardant, which can reduce the amount of flame retardant used. The mesh structure can increase the flame retardant reaction contact area, which can improve the flame retardant properties of the optical cable on the basis of reducing the amount of flame retardant added. The decomposition of MH@GNP nanocomposite flame retardant can hinder the transfer of heat, so that the cable core of the optical cable will not be damaged by high temperature, and can hinder the overflow of flammable gas, reduce the smoke emission when the optical cable burns, and is environmentally friendly. By coating the MH@GNP nanocomposite flame retardant on the surface of the mesh aramid fabric, it can play a good flame retardant and high temperature resistance role, protect the cable core from burning damage, ensure smooth communication in the event of a fire and during disaster relief, and avoid the expansion of disasters caused by signal interruption and data loss. When a fire occurs, the overall integrity of the residual carbon morphology after the optical cable burns is good and has a certain strength, which can maintain its own shape.

[0038] The water-blocking layer 3 is made of an anti-adhesion 0.1 mm PT water-blocking tape.

[0039] The optical fiber oil-filled sleeve 8 is made of high modulus polyester material.

[0040] Parts or structures not specifically described in the present invention may adopt existing technologies or existing products and will not be described in detail here.

[0041] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An environmentally friendly flame-retardant optical cable, characterized in that: The cable core comprises a flame retardant outer sheath, a flame retardant coated braided layer, a water blocking layer, a stainless steel belt cladding and a cable core which are sequentially arranged from outside to inside. The cable core comprises a central reinforcement member, a plurality of filling ropes and a plurality of optical fiber units, and the plurality of filling ropes and the plurality of optical fiber units are twisted around the central reinforcement member.

2. The environmentally friendly flame-retardant optical cable according to claim 1, characterized in that: The outer circumference of the stainless steel belt cladding is formed with spaced concave surfaces and convex surfaces, and a concave surface is arranged between every two convex surfaces.

3. The environmentally friendly flame-retardant optical cable according to claim 2, characterized in that: A tear rope is arranged between the water blocking layer and the stainless steel belt cladding and in one of the concave surfaces.

4. The environmentally friendly flame-retardant optical cable according to claim 1, characterized in that: The space between the water-blocking layer and the stainless steel belt cladding is filled with flame-retardant powder.

5. The environmentally friendly flame-retardant optical cable according to claim 1, characterized in that: The cable core comprises a central reinforcement member, three filling ropes and three optical fiber units. The central reinforcement member is located at the center of the cable core. The three filling ropes and the three optical fiber units are evenly distributed on the periphery of the central reinforcement member and twisted around the central reinforcement member.

6. The environmentally friendly flame-retardant optical cable according to claim 5, characterized in that: One of the filling ropes is arranged between two optical fiber units, and the remaining two filling ropes are arranged adjacent to each other; one of the optical fiber units is arranged between two filling ropes, and the remaining two optical fiber units are arranged adjacent to each other.

7. The environmentally friendly flame-retardant optical cable according to claim 1, characterized in that: The optical fiber unit comprises an optical fiber oil-filled sleeve and a plurality of optical fibers arranged inside the optical fiber oil-filled sleeve, and the optical fiber oil-filled sleeve is filled with flame-retardant gel.

8. The environmentally friendly flame-retardant optical cable according to claim 1, characterized in that: The gaps in the cable core are filled with water-blocking cable core fillers.

9. The environmentally friendly flame-retardant optical cable according to claim 1, characterized in that: The thickness of the flame retardant outer sheath is 1.6-3.0 mm.

10. The environmentally friendly flame-retardant optical cable according to claim 1, characterized in that: The water-blocking layer is made of anti-adhesion 0.1 mm PT water-blocking tape.

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