An environmentally friendly, low-smoke, halogen-free flame-retardant cable

Abstract

This utility model relates to the field of cable technology, and in particular to an environmentally friendly low-smoke halogen-free flame-retardant cable, comprising a cable body, which includes, from the inside out, a conductive core, a composite insulation layer, a shielding layer, a flame-retardant filling layer, and a sheath layer, all arranged in a coaxial nesting manner. The conductive core is formed by stranding multiple copper conductors and is tin-plated on the surface. The composite insulation layer is a three-layer composite structure, consisting of, from the inside out, a cross-linked polyethylene inner layer, a silane cross-linked polyolefin middle layer, and a low-smoke halogen-free flame-retardant polyolefin outer layer. The shielding layer is a double-layer shielding structure, including an aluminum-plastic composite tape wrapping layer and a tin-plated copper wire braided layer. The sheath layer is a double-layer co-extruded structure, including an inner sheath layer and an outer sheath layer arranged from the inside out. This utility model achieves comprehensive performance of low smoke and halogen-free, high flame retardancy, strong insulation, anti-interference, and aging resistance, and is safe, environmentally friendly, and reliable in use, meeting the stable operation requirements in complex environments such as high temperature and humidity.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, and in particular to an environmentally friendly, low-smoke, halogen-free flame-retardant cable. Background Technology

[0002] With the increasing demands for safety and environmental protection in modern buildings and public facilities, the numerous shortcomings of traditional cables have become increasingly apparent: Firstly, the insulation layer of conventional cables is mostly a single-layer structure, making it difficult to simultaneously achieve insulation performance and flame retardancy. Some halogen-containing flame-retardant materials release toxic gases and dense smoke when burning, which not only harms the respiratory system but also hinders fire rescue efforts. Secondly, the shielding layer design is simple, often consisting of a single wrapping or simple braiding structure, resulting in poor electromagnetic shielding and susceptibility to external electromagnetic interference affecting transmission stability. Thirdly, the filling and sheathing materials lack sufficient mechanical strength, making them prone to cracking and aging during long-term use. Furthermore, their waterproof and weather-resistant properties are weak, making them unsuitable for humid or high-temperature environments. In addition, the conductive cores of some cables have poor oxidation resistance, and long-term operation can lead to a decline in conductivity due to corrosion. Therefore, the development of a cable that combines environmental friendliness, low smoke, high efficiency flame retardancy, strong insulation, anti-interference, and high mechanical strength has become an urgent industry need. Utility Model Content

[0003] To address some of the problems existing in the prior art, this utility model provides an environmentally friendly low-smoke halogen-free flame-retardant cable. This cable achieves comprehensive performance in terms of low smoke and halogen-free properties, high flame retardancy, strong insulation, anti-interference, and aging resistance, effectively solving the shortcomings of traditional cables in terms of safety, environmental protection, and reliability, and meeting the stable operation requirements in complex environments such as high temperature and humidity.

[0004] To achieve the above objectives, this utility model provides an environmentally friendly low-smoke halogen-free flame-retardant cable, comprising a cable body, which includes, from the inside out, a conductive core, a composite insulation layer, a shielding layer, a flame-retardant filling layer, and a sheath layer, all arranged in a coaxial nesting manner. The conductive core is formed by stranding multiple copper conductors and is tin-plated. The composite insulation layer is a three-layer composite structure, consisting of, from the inside out, a cross-linked polyethylene inner layer, a silane cross-linked polyolefin middle layer, and a low-smoke halogen-free flame-retardant polyolefin outer layer. The shielding layer is a double-layer shielding structure, including an aluminum-plastic composite tape wrapping layer and a tin-plated copper wire braided layer. The sheath layer is a double-layer co-extruded structure, including an inner sheath layer and an outer sheath layer arranged from the inside out. The flame-retardant filling layer is disposed between the tin-plated copper wire braided layer and the inner sheath layer.

[0005] In operation, current flows into the conductive core and is efficiently conducted through multiple stranded tin-plated copper conductors. The tin plating layer on the surface of the conductive core prevents oxidation of the conductor to maintain stable conductivity. During current transmission, the cross-linked polyethylene inner layer of the composite insulation layer provides high-strength insulation to prevent current leakage. The silane cross-linked polyolefin middle layer enhances the heat resistance and integrity of the insulation structure. The low-smoke halogen-free flame-retardant polyolefin outer layer, through nano-magnesium hydroxide flame-retardant particles, ensures insulation while blocking the risk of arc ignition during current transmission. The double-layer shielding structure of the aluminum-plastic composite tape wrapping layer and the tin-plated copper... The braided layer works together to shield against external electromagnetic interference. The high-density tin-plated copper wire braid further reduces signal loss during current transmission, ensuring transmission stability. The ceramicized silicone rubber strip of the flame-retardant filler layer is filled between the shielding layer and the sheath layer to maintain the stability of the internal structure of the cable and avoid poor contact caused by structural deformation during current transmission. The double-co-extruded inner and outer sheath layers utilize the high strength properties of TPU material to protect the internal structure from external mechanical damage. The superhydrophobic protective layer on the surface of the outer sheath layer effectively isolates moisture and contaminants, ensuring continuous and stable current transmission in complex environments.

[0006] The beneficial effects of this utility model are as follows: By using multiple tin-plated copper conductors stranded together in the conductive core, the oxidation resistance and conductivity stability are improved; the composite insulation layer adopts a three-layer gradient design, with the cross-linked polyethylene inner layer ensuring high insulation strength, the silane cross-linked polyolefin middle layer balancing processability and heat resistance, and the low-smoke halogen-free flame-retardant polyolefin outer layer achieving efficient flame retardancy and halogen-free release through nano-magnesium hydroxide particles; in the double-layer shielding structure, the aluminum-plastic composite tape wrapping layer and the high-density tin-plated copper wire braiding layer work together to significantly enhance the electromagnetic shielding effect; the flame-retardant filling layer uses ceramicized silicone rubber strips containing montmorillonite nanoparticles, which can form a stable ceramic structure at high temperatures, improving structural integrity under fire conditions; the double-layer TPU sheath layer improves mechanical strength through thickness ratio optimization, and the superhydrophobic protective layer on the outer surface enhances waterproof and weather resistance. Overall, it achieves comprehensive performance of low smoke halogen-free, high flame retardancy, strong insulation, anti-interference, and aging resistance, effectively solving the shortcomings of traditional cables in terms of safety, environmental protection, and reliability, and can be widely used in complex scenarios with stringent performance requirements.

[0007] As a further improvement of this utility model, in order to enhance the oxidation resistance, conductivity stability and mechanical strength of the conductive core, the diameter of a single copper conductor in the conductive core is 0.15 to 0.25 mm, the stranding pitch is 10 to 15 times the outer diameter of the conductive core, and the tin plating thickness is 0.01 to 0.03 mm.

[0008] As a further improvement of this utility model, in order to ensure insulation strength, balance processability and heat resistance, and simultaneously achieve high-efficiency flame retardancy and halogen-free low smoke, the cross-linking degree of the inner layer of the cross-linked polyethylene is 85-95%, and the thickness is 0.6-0.9 mm; the cross-linking degree of the middle layer of the silane cross-linked polyolefin is 60%-70%, and the thickness is 0.5-0.7 mm; the thickness of the outer layer of the low smoke halogen-free flame-retardant polyolefin is 0.4-0.6 mm, and 30-50% of nano-magnesium hydroxide flame-retardant particles are uniformly added to the outer layer of the low smoke halogen-free flame-retardant polyolefin.

[0009] As a further improvement of this utility model, in order to improve the anti-interference ability and enhance the electromagnetic shielding effect, the wrapping direction of the aluminum-plastic composite tape wrapping layer is left-side overlapping wrapping with an overlap rate of 25-35%; the copper wire diameter of the tin-plated copper wire braided layer is 0.12-0.18mm, the braiding density is ≥90%, and the braiding angle is 45°-55°.

[0010] As a further improvement of this utility model, in order to enhance the structural integrity and flame-retardant durability of the cable under fire conditions, the flame-retardant filling layer is a ceramicized silicone rubber strip, in which 10-15% montmorillonite nanoparticles are uniformly added.

[0011] As a further improvement of this utility model, in order to optimize mechanical strength, improve overall crack resistance and aging resistance, and enhance waterproof and weather resistance, the thickness ratio of the inner sheath layer to the outer sheath layer is 4:6, and the thickness of the inner sheath layer is 0.8-1.2mm; both the inner and outer sheath layers are made of TPU material, and the outer surface of the outer sheath layer is also provided with a superhydrophobic protective layer. Attached Figure Description

[0012] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings:

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0014] The structure consists of: 1. Conductive core, 2. Cross-linked polyethylene inner layer, 3. Silane cross-linked polyolefin middle layer, 4. Low smoke halogen-free flame-retardant polyolefin outer layer, 5. Aluminum-plastic composite tape wrapping layer, 6. Tinned copper wire braided layer, 7. Flame-retardant filling layer, 8. Inner sheath layer, 9. Outer sheath layer, and 10. Superhydrophobic protective layer. Detailed Implementation

[0015] like Figure 1The illustrated environmentally friendly low-smoke halogen-free flame-retardant cable includes a cable body. The cable body comprises, from the inside out, a conductive core 1, a composite insulation layer, a shielding layer, a flame-retardant filling layer 7, and a sheath layer, all arranged in a coaxial nesting manner. The conductive core 1 is formed by stranding multiple copper conductors and has a tin-plated surface. The composite insulation layer is a three-layer composite structure, consisting of, from the inside out, a cross-linked polyethylene inner layer 2, a silane cross-linked polyolefin middle layer 3, and a low-smoke halogen-free flame-retardant polyolefin outer layer 4. The shielding layer is a double-layer shield. The sheath structure includes an aluminum-plastic composite tape wrapping layer 5 and a tin-plated copper wire braided layer 6; the sheath layer is a double-layer co-extruded structure, including an inner sheath layer 8 and an outer sheath layer 9 arranged sequentially from the inside to the outside; the flame-retardant filler layer 7 is disposed between the tin-plated copper wire braided layer 6 and the inner sheath layer 8; the diameter of a single copper conductor in the conductive core 1 is 0.15-0.25 mm, the stranding pitch is 10-15 times the outer diameter of the conductive core 1, and the tin plating thickness is 0.01-0.03 mm; the degree of cross-linking of the cross-linked polyethylene inner layer 2 is... The crosslinking degree of the silane crosslinked polyolefin middle layer 3 is 60%–70%, and the thickness is 0.5–0.7 mm; the thickness of the low-smoke halogen-free flame-retardant polyolefin outer layer 4 is 0.4–0.6 mm, and 30–50% of nano-magnesium hydroxide flame-retardant particles are uniformly added to the low-smoke halogen-free flame-retardant polyolefin outer layer 4; the wrapping direction of the aluminum-plastic composite tape wrapping layer 5 is left-hand overlapping wrapping, with an overlap rate of 25–35%; the copper wires of the tin-plated copper wire braided layer 6 are straight. The diameter is 0.12-0.18 mm, the weaving density is ≥90%, and the weaving angle is 45°-55°; the flame-retardant filler layer 7 is a ceramicized silicone rubber strip, in which 10-15% montmorillonite nanoparticles are uniformly added; the thickness ratio of the inner sheath layer 8 to the outer sheath layer 9 is 4:6, and the thickness of the inner sheath layer 8 is 0.8-1.2 mm; both the inner sheath layer 8 and the outer sheath layer 9 are made of TPU material, and the outer surface of the outer sheath layer 9 is also provided with a superhydrophobic protective layer 10.

[0016] In operation, current flows into the conductive core 1 and is efficiently conducted through multiple stranded tin-plated copper conductors. The tin plating layer on the surface of the conductive core 1 prevents oxidation of the conductor to maintain stable conductivity. During current transmission, the cross-linked polyethylene inner layer 2 of the composite insulation layer provides high-strength insulation to prevent current leakage. The silane cross-linked polyolefin middle layer 3 enhances the heat resistance and integrity of the insulation structure. The low-smoke halogen-free flame-retardant polyolefin outer layer 4, through nano-magnesium hydroxide flame-retardant particles, ensures insulation while blocking the risk of arc ignition during current transmission. The double-layer shielding structure of the aluminum-plastic composite tape wrapping layer 5 and the tin-plated copper wire... The braided layer 6 works together to shield against external electromagnetic interference. The high-density tin-plated copper wire braided layer 6 further reduces signal loss during current transmission, ensuring transmission stability. The ceramicized silicone rubber strip of the flame-retardant filler layer 7 is filled between the shielding layer and the sheath layer to maintain the stability of the internal structure of the cable and avoid poor contact caused by structural deformation during current transmission. The double-co-extruded inner sheath layer 8 and outer sheath layer 9 utilize the high strength characteristics of TPU material to protect the internal structure from external mechanical damage. The superhydrophobic protective layer 10 on the surface of the outer sheath layer 9 effectively isolates moisture and contaminants, ensuring continuous and stable current transmission in complex environments.

[0017] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. An environmentally friendly, low-smoke, halogen-free flame-retardant cable, comprising a cable body, characterized in that: The cable body includes, from the inside out, a conductive core (1), a composite insulation layer, a shielding layer, a flame-retardant filling layer (7), and a sheath layer, all arranged in a coaxial nesting manner. The conductive core (1) is formed by stranding multiple copper conductors and is tin-plated on the surface. The composite insulation layer is a three-layer composite structure, consisting of, from the inside out, a cross-linked polyethylene inner layer (2), a silane cross-linked polyolefin middle layer (3), and a low-smoke halogen-free flame-retardant polyolefin outer layer (4). The shielding layer is a double-layer shielding structure, including an aluminum-plastic composite tape wrapping layer (5) and a tin-plated copper wire braided layer (6). The sheath layer is a double-layer co-extruded structure, including an inner sheath layer (8) and an outer sheath layer (9) arranged from the inside out. The flame-retardant filling layer (7) is disposed between the tin-plated copper wire braided layer (6) and the inner sheath layer (8).

2. The environment-friendly low-smoke and zero-halogen flame-retardant cable according to claim 1, characterized in that: The diameter of a single copper conductor in the conductive core (1) is 0.15 to 0.25 mm, the stranding pitch is 10 to 15 times the outer diameter of the conductive core (1), and the tin plating thickness is 0.01 to 0.03 mm.

3. The environment-friendly low smoke and zero halogen flame-retardant cable according to claim 1, characterized in that: The cross-linked polyethylene inner layer (2) has a cross-linking degree of 85-95% and a thickness of 0.6-0.9 mm; the silane cross-linked polyolefin middle layer (3) has a cross-linking degree of 60%-70% and a thickness of 0.5-0.7 mm; and the low-smoke halogen-free flame-retardant polyolefin outer layer (4) has a thickness of 0.4-0.6 mm.

4. The environment-friendly low smoke and zero halogen flame-retardant cable according to claim 1, characterized in that: The aluminum-plastic composite tape wrapping layer (5) is wrapped in a left-hand overlapping direction with an overlap rate of 25-35%; the copper wire diameter of the tin-plated copper wire braided layer (6) is 0.12-0.18 mm, the braiding density is ≥90%, and the braiding angle is 45°-55°.

5. The environmentally friendly low-smoke halogen-free flame-retardant cable according to claim 1, characterized in that: The flame-retardant filler layer (7) is a ceramicized silicone rubber strip.

6. The environment-friendly low smoke and zero halogen flame-retardant cable according to claim 1, characterized in that: The thickness ratio of the inner sheath layer (8) to the outer sheath layer (9) is 4:6, and the thickness of the inner sheath layer (8) is 0.8 to 1.2 mm. Both the inner sheath layer (8) and the outer sheath layer (9) are made of TPU material, and the outer surface of the outer sheath layer (9) is also provided with a superhydrophobic protective layer (10).

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