• 专利附录
  • 专利说明
  • 权利要求
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  • 优先权
    • 专利摘要:
    Polyethylene insulated polyolefin sheathed low-smoke halogen-free flame-retardant coaxial cable 5 Disclosed is a polyethylene insulated polyolefin sheathed low-smoke halogen-free flame-retardant coaxial cable, which belongs to the field of cables. The polyethylene insulated polyolefin sheathed low-smoke halogen-free flame-retardant coaxial cable includes four cable conductors arranged in an annular array; an 10 insulating layer is wrapped outside the cable conductor; an inner shielding layer is wrapped outside the insulating layer; the cable conductor, the insulating layer and the inner shielding layer form a cable core; a reinforced core is disposed among the four cable cores; the four cable cores are disposed by tightly attaching to the reinforced core; a first external shielding layer is disposed outside the cable core; and a filling 15 layer is disposed in a space between the first outer shielding layer and the cable core. With an insulating layer, multiple shielding layers, an inner sheath, and an outer sheath, the polyethylene insulated polyolefin sheathed low-smoke halogen-free flame-retardant coaxial cable provided by the present invention can protect the coaxial cable fully and effectively, greatly improves a flame retardance, an oxidation 20 resistance and a shielding performance of the coaxial cable, and prolongs a service life of the cable.
    公开号:NL2025370A
    申请号:NL2025370
    申请日:2020-04-20
    公开日:2021-09-16
    发明作者:Rui Lichun
    申请人:Jiangsu Pucao Tech Co Ltd；
    IPC主号:
    专利说明:

    Polyethylene insulated polyolefin sheathed low-smoke halogen-free flame-retardant coaxial cable Technical Field The present invention relates to the technical field of cables, and in particular to a polyethylene insulated polyolefin sheathed low-smoke halogen-free flame-retardant coaxial cable. Background A coaxial cable is a cable in which two concentric conductors are provided, and the conductors share a same axis with a shielding layer. The most common coaxial cable is composed of a copper wire conductor isolated by an insulating material; another layer of annular conductor and an insulator thereof are provided outside an inner layer of insulating material, and then, the whole cable is wrapped by a sheath made of a polyvinyl chloride or Teflon material. The coaxial cable is used between a television user and a community antenna by a television company, may also be used by a television company, and is also widely used in an intranet and an Ethernet. Many cables or many pairs of cables may be put into a same insulating sheath. In cooperation with an amplifier, it may transmit a signal to a very far place. The traditional coaxial cable includes an inner conductor, a polyethylene insulating layer, an outer conductor shielding layer and a material sheath; the outer conductor shielding layer is formed by braiding a copper wire on a composite aluminum-plastic tape, which results in that the cable has an overall hard structure, a low flexibility and a small bending radius and cannot be applied to corner installation, and thus the construction is difficult and the tensile resistance is poor. Additionally, the flame retardance is common, and a noise is generated in a signal transmission process; and the noise is increased along with the acceleration of a transmission frequency to affect a receiving effect of a terminal device. Summary
    1. Technical problems to be solved In view of problems in the conventional art, an objective of the present invention is to provide a polyethylene insulated polyolefin sheathed low-smoke halogen-free flame-retardant coaxial cable. With an insulating layer, multiple shielding layers, an inner sheath, and an outer sheath, the polyethylene insulated polyolefin sheathed low-smoke halogen-free flame-retardant coaxial cable provided by the present invention can protect the coaxial cable fully and effectively, greatly improves a flame retardance, an oxidation resistance and a shielding performance of the coaxial cable, and prolongs a service life of the cable.
    2. Technical solutions In order to solve the above-mentioned technical problems, the present invention uses the following technical solutions.
    A polyethylene insulated polyolefin sheathed low-smoke halogen-free flame-retardant coaxial cable includes four cable conductors arranged in an annular array; an insulating layer is wrapped outside the cable conductor; an inner shielding layer is wrapped outside the insulating layer; the cable conductor, the insulating layer and the inner shielding layer form a cable core; a reinforced core is disposed among the four cable cores; the four cable cores are disposed by tightly attaching to the reinforced core; a first external shielding layer is disposed outside the cable core; a filling layer is disposed in a space between the first outer shielding layer and the cable core; four tensile ropes are disposed between the filling layer and the four cable cores and the reinforced core; a second outer shielding layer is wrapped outside the first outer shielding layer, an inner sheath is wrapped outside the second shielding layer; and an outer sheath is sleeved outside the inner sheath. With an insulating layer, multiple shielding layers, an inner sheath, and an outer sheath, the polyethylene insulated polyolefin sheathed low-smoke halogen-free flame-retardant coaxial cable provided by the present invention can protect the coaxial cable fully and effectively, greatly improves a flame retardance, an oxidation resistance and a shielding performance of the coaxial cable, and prolongs a service life of the cable.
    Further, the insulating layer is a cross-linked polyethylene insulating layer. Further, the reinforced core is made by multiple strands of Aramid yarns via twisting. The reinforced core made by the multiple strands of Aramid yarns via twisting can effectively improve a strength of the coaxial cable.
    Further, the filling layer is an air bag filled with a carbon dioxide gas, and the air bag is made of a low-ignition-point material by sealing. The filling layer is the air bag filled with the carbon dioxide gas. On one hand, an effective buffering effect can be taken when the cable is extruded by an external force, and a compressive property of the coaxial cable is improved; and on the other hand, when an open flame is generated in the cable, the air bag made of the low-ignition-point material is fractured and the released carbon dioxide can put out a fire quickly, thus effectively improving a safety property of the coaxial cable.
    Further, the tensile rope is made by multiple strands of steel wire ropes via twisting. The tensile rope made by the multiple strands of steel wire ropes via twisting can effectively improve a tensile property of the coaxial cable, thus improving a flexibility of the coaxial cable.
    Further, the first outer shielding layer is made of a tinned copper wire braided net, and the second outer shielding layer is made of a polytetrafluoroethylene semi-conductive tape. The first outer shielding layer is the tinned copper wire braided net and the second outer shielding layer is the polytetrafluoroethylene semi-conductive tape. The tinned copper wire braided net provides a first layer of shielding, effectively reduces an influence of an external signal in cooperation with the polytetrafluoroethylene semi-conductive tape, and can effectively increase a bending property.
    Further, a raw material of the inner sheath includes the following components in parts by weight: 2-5 parts of linear low density polyethylene, 5-10 parts of poly(ethylene-octene) copolymer, 20-50 parts of aluminum hydroxide, 30-40 parts of Ethylene-Vinyl Acetate Copolymer (EVA) resin, 0.7-1.5 parts of silane coupling agent, 2-5 parts of compatilizer, 1-2 parts of rheological agent, 3-8 parts of halogen-free flame retardant, 3-8 parts of antioxidant and 1-3 parts of assistant. By means of formula adjustment of each component of the inner sheath 9, a flame retardant property of the inner sheath 9 is effectively improved; and moreover, smoke released in combustion is less, a resistivity and an oxygen index are greatly improved, and purposes of low smoke, low toxicity and flame retardance are effectively achieved; and the inner sheath provides a first layer of outer protection for the coaxial cable.
    Further, a raw material of the outer sheath includes the following components in parts by weight: 55-65 parts of ethylene-vinyl acetate copolymer, 35-50 parts of polyethylene, 5-8 parts of carbon black, 6-8 parts of melamine pyrophosphate, 55-65 parts of modified aluminum hydroxide, 0.1-0.2 parts of dicumyl peroxide,
    1.5-2 parts of vinyltrimethoxysilane, 1-2 parts of polyethylene wax, 2-3 parts of talcum powder, 0.5-0.6 parts of ultraviolet light absorber and 2-5 parts of antioxidant. Further, the modified aluminum hydroxide is titanate modified aluminum hydroxide; and a preparation method of the modified aluminum hydroxide is as follows: aluminum hydroxide fine powder and titanate are put into a colloid mill for processing to obtain activated aluminum hydroxide powder, a mass ratio of the aluminum hydroxide fine powder to the titanate being 11-12:1, and the aluminum hydroxide fine powder having a particle size of £1 um; and then, the activated aluminum hydroxide powder is put into a low-speed kneader, 200-220 mL of aluminum stearate ethanol solution having a concentration of 25 wt% is sprayed onto the activated aluminum hydroxide powder, a mixture is mixed for 10-15 min with stirring at a rotational speed of 250-300 r/min, and upon the completion of mixing, the mixture is heated to 80-90°C and continuously mixed for 4-5 h with stirring at a rotational speed of 600-700 r/min to obtain the modified aluminum hydroxide powder. By means of formula adjustment of each component of the outer sheath 10 and with modification on an inorganic flame retardant of aluminum hydroxide and synergy with a phosphorus-based flame retardant, a thermal oxidation resistance and a flame retardance of the material are greatly improved, and a good mechanical property is achieved, and the outer sheath provides a second layer of outer protection for the coaxial cable and further improves the flame retardance and the oxidation resistance of the cable.
    3. Beneficial effects Compared with the conventional art, the present invention has the following advantages.
    (1) With an insulating layer, multiple shielding layers, an inner sheath, and an outer sheath, the polyethylene insulated polyolefin sheathed low-smoke halogen-free flame-retardant coaxial cable provided by the present invention can protect the coaxial cable fully and effectively, greatly improves a flame retardance, an oxidation resistance and a shielding performance of the coaxial cable, and prolongs a service life of the cable.
    (2) A reinforced core 4 made by multiple strands of Aramid yarns via twisting can effectively improve a strength of the coaxial cable.
    (3) A filling layer 5 is an air bag filled with a carbon dioxide gas. On one hand, an effective buffering effect can be taken when the cable is extruded by an external force, and a compressive property of the coaxial cable is improved; and on the other hand, when an open flame is generated in the cable, the air bag made of a low-ignition-point material is fractured and the released carbon dioxide can put out a fire quickly, thus effectively improving a safety property of the coaxial cable.
    5 (4) A tensile rope 6 made by multiple strands of steel wire ropes via twisting can effectively improve a tensile property of the coaxial cable, thus improving a flexibility of the coaxial cable.
    (5) A first outer shielding layer 7 is a tinned copper wire braided net and a second outer shielding layer 8 is a polytetrafluoroethylene semi-conductive tape.
    The tinned copper wire braided net provides a first layer of shielding, effectively reduces an influence of an external signal in cooperation with the polytetrafluoroethylene semi-conductive tape, and can effectively increase a bending property.
    (6) By means of formula adjustment of each component of the inner sheath 9, a flame retardant property of the inner sheath 9 is effectively improved; and moreover, smoke released in combustion is less, a resistivity and an oxygen index are greatly improved, and purposes of low smoke, low toxicity and flame retardance are effectively achieved; and the inner sheath provides a first layer of outer protection for the coaxial cable.
    (7) By means of formula adjustment of each component of the outer sheath 10 and with modification on an inorganic flame retardant of aluminum hydroxide and synergy with a phosphorus-based flame retardant, a thermal oxidation resistance and a flame retardance of the material are greatly improved, and a good mechanical property is achieved; and the outer sheath provides a second layer of outer protection for the coaxial cable and further improves the flame retardance and the oxidation resistance of the cable.
    Brief Description of the Drawings Fig. 1 is a front view of the present invention.
    In the figures:
    1. conductor, 2. insulating layer, 3. inner shielding layer, 4. reinforced core, 5. filling layer, 6. tensile rope, 7. first outer shielding layer, 8. second outer shielding layer, 9. inner sheath, and 10. outer sheath.
    Detailed Description of the Embodiments The technical solutions of the embodiments of the present invention are clearly and completely described below in combination with the accompanying drawings in the embodiments of the present invention.
    It is apparent that the described embodiments are only a part of embodiments of the present invention, instead of all the embodiments.
    All of the other embodiments, obtained by those of ordinary skill in the art based on the embodiments of the present invention without any inventive efforts, fall into the protection scope of the present invention.
    In the description of the embodiments of the present invention, orientation or position relationships indicated by the terms “upper”, "lower", "inner", "outer", "top/bottom end" etc. are based on the orientation or position relationships as shown in the drawings, for ease of the description of the present invention only, rather than indicating that the indicated device or element have a particular orientation and must be constructed and operated in the particular orientation.
    Therefore, these terms should not be understood as a limitation to the present invention.
    In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be construed as indicating or implying a relative importance.
    In the description of the present invention, it should be noted that, unless otherwise clearly stated and limited, the terms “mounted”, “provided with”, “sleeved” , and “connected” should be understood broadly, for instance, it can be a fixed connection, a detachable connection or an integral connection; can be a mechanical connection, and can also be an electrical connection; can be a direct connection, can also be an indirect connection by an intermediary, and can be an internal communication of two elements.
    Those of ordinary skill in the art may understand concrete meanings of the terms in the present invention as per specific circumstances.
    Embodiment 1 Referring to Fig. 1, a polyethylene insulated polyolefin sheathed low-smoke halogen-free flame-retardant coaxial cable includes four cable conductors 1 arranged in an annular array; an insulating layer 2 is wrapped outside the cable conductor 1; an inner shielding layer 3 is wrapped outside the insulating layer 2; the cable conductor 1, the insulating layer 2 and the inner shielding layer 3 form a cable core; a reinforced core 4 is disposed among the four cable cores; the four cable cores are disposed by tightly attaching to the reinforced core 4; a first external shielding layer 7 is disposed outside the cable core; a filling layer 5 is disposed in a space between the first outer shielding layer 7 and the cable core; four tensile ropes 6 are disposed between the filling layer 5 and the four cable cores and the reinforced core 4; a second outer shielding layer 8 is wrapped outside the first outer shielding layer 7; an inner sheath 9 is wrapped outside the second shielding layer 8; and an outer sheath 10 is sleeved outside the inner sheath 9. With an insulating layer, multiple shielding layers, an inner sheath, and an outer sheath, the polyethylene insulated polyolefin sheathed low-smoke halogen-free flame-retardant coaxial cable provided by the present invention can protect the coaxial cable fully and effectively, greatly improves a flame retardance, an oxidation resistance and a shielding performance of the coaxial cable, and prolongs a service life of the cable.
    The insulating layer 2 is a cross-linked polyethylene insulating layer.
    The reinforced core 4 is made by multiple strands of Aramid yarns via twisting. The reinforced core 4 made by the multiple strands of Aramid yarns via twisting can effectively improve a strength of the coaxial cable.
    The filling layer 5 is an air bag filled with a carbon dioxide gas, and the air bag is made of a low-ignition-point material by sealing. The filling layer 5 is the air bag filled with the carbon dioxide gas. On one hand, an effective buffering effect can be taken when the cable is extruded by an external force, and a compressive property of the coaxial cable is improved; and on the other hand, when an open flame is generated in the cable, the air bag made of the low-ignition-point material is fractured and the released carbon dioxide can put out a fire quickly, thus effectively improving a safety property of the coaxial cable.
    The tensile rope 6 is made by multiple strands of steel wire ropes via twisting. The tensile rope 6 made by the multiple strands of steel wire ropes via twisting can effectively improve a tensile property of the coaxial cable, thus improving a flexibility of the coaxial cable.
    The first outer shielding layer 7 is made of a tinned copper wire braided net, and the second outer shielding layer 8 is made of a polytetrafluoroethylene semi-conductive tape. The first outer shielding layer 7 is the tinned copper wire braided net and the second outer shielding layer 8 is the polytetrafluoroethylene semi-conductive tape. The tinned copper wire braided net provides a first layer of shielding, effectively reduces an influence of an external signal in cooperation with the polytetrafluoroethylene semi-conductive tape, and can effectively increase a bending property. A raw material of the inner sheath 9 includes the following components in parts by weight: 2-5 parts of linear low density polyethylene, 5-10 parts of poly(ethylene-octene) copolymer, 20-50 parts of aluminum hydroxide, 30-40 parts of EVA resin, 0.7-1.5 parts of silane coupling agent, 2-5 parts of compatilizer, 1-2 parts of rheological agent, 3-8 parts of halogen-free flame retardant, 3-8 parts of antioxidant and 1-3 parts of assistant.
    The inner sheath 9 is increased in the present invention. By means of formula adjustment of each component of the inner sheath 9, a flame retardant property of the inner sheath 9 is effectively improved; and moreover, smoke released in combustion is less, a resistivity and an oxygen index are greatly improved, and purposes of low smoke, low toxicity and flame retardance are effectively achieved; and the inner sheath 9 provides a first layer of outer protection for the coaxial cable.
    A raw material of the outer sheath 10 includes the following components in parts by weight: 55-65 parts of ethylene-vinyl acetate copolymer, 35-50 parts of polyethylene, 5-8 parts of carbon black, 6-8 parts of melamine pyrophosphate, 55-65 parts of modified aluminum hydroxide, 0.1-0.2 parts of dicumyl peroxide,
    1.5-2 parts of vinyltrimethoxysilane, 1-2 parts of polyethylene wax, 2-3 parts of talcum powder, 0.5-0.6 parts of ultraviolet light absorber and 2-5 parts of antioxidant.
    The modified aluminum hydroxide is titanate modified aluminum hydroxide; and a preparation method of the modified aluminum hydroxide is as follows: aluminum hydroxide fine powder and titanate are put into a colloid mill for processing to obtain activated aluminum hydroxide powder, a mass ratio of the aluminum hydroxide fine powder to the titanate being 11-12:1, and the aluminum hydroxide fine powder having a particle size of <1 um; and then, the activated aluminum hydroxide powder is put into a low-speed kneader, 200-220 mL of aluminum stearate ethanol solution having a concentration of 25 wt% is sprayed onto the activated aluminum hydroxide powder, a mixture is mixed for 10-15 min with stirring at a rotational speed of 250-300 r/min, and upon the completion of mixing, the mixture is heated to 80-90°C and continuously mixed for 4-5 h with stirring at a rotational speed of 600-700 r/min to obtain the modified aluminum hydroxide powder.
    The outer sheath 10 is increased in the present invention.
    By means of formula adjustment of each component of the outer sheath 10 and with modification on an inorganic flame retardant of aluminum hydroxide and synergy with a phosphorus-based flame retardant, a thermal oxidation resistance and a flame retardance of the material are greatly improved, and a good mechanical property is achieved; and the outer sheath provides a second layer of outer protection for the coaxial cable and further improves the flame retardance and the oxidation resistance of the cable.
    The above are merely preferred and specific implementation manners of the present invention.
    The protection scope of the present invention is not limited thereto.
    Any equivalent replacement or change made by those of skill in the art according to the technical solutions and improved concepts of the present invention within a disclosed technical scope of the present invention should be included in the protection scope of the present invention.
    权利要求:
    Claims (9)
    [1]
    Conclusions 1 . The polyethylene-insulated polyolefin sheathed, low-smoke halogen-free, flame-retardant coaxial cable comprises four cable core conductors 1 arranged in a circular array, is characterized by: on the outside of the aforementioned cable core conductor 1 is wrapped with insulation layer 2, and outside the insulation layer 2 is an inner shielding layer 3 is wound, and the aforementioned cable core conductor 1, the insulation layer 2 and the inner shielding layer 3 form a cable core, and a reinforcing cable core 4 is arranged between the four cable cores, and all the cable cores are closely connected with the reinforcing cable core 4 and on the outside of the a first outer shielding layer 7 is provided in the aforesaid cable core, and a filler layer 5 is provided in the gap between the aforesaid first outer shielding layer 7 and the cable core, and between the aforesaid filler layer 5 and the four cable cores and reinforced cable cores 4, four anti-traction cables 6 are provided , and on the outside of d In the aforesaid second outer protective layer 7, a second outer protective layer 8 is wrapped, and at the aforesaid second outer protective layer 8, outer sheath 9 is wrapped, and on the outside of the inner sheath 9 an outer sheath 10 is wrapped.
    [2]
    2 . The polyethylene-insulated polyolefin sheathed, low-smoke halogen-free, flame-retardant coaxial cable according to claim 1, is characterized by: said insulating layer 2 is a cross-linked insulating polyethylene layer.
    [3]
    The polyethylene-insulated polyolefin sheathed low-smoke halogen-free flame-retardant coaxial cable according to claim 1, characterized by: said reinforcing cable core 4 is made of multi-strand spun yarn.
    [4]
    4 . The polyethylene-insulated polyolefin sheathed low-smoke halogen-free flame-retardant coaxial cable according to claim 1, is characterized by: said filling layer 5 is an airbag filled with carbon dioxide gas inside, and the airbag is made of a material with a low focus.
    [5]
    The polyethylene-insulated polyolefin sheathed low-smoke halogen-free flame-retardant coaxial cable according to claim 1, characterized by : the anti-pull cable 6 is made of multiple strands of steel wire.
    [6]
    6 . The polyethylene-insulated polyolefin sheathed low-smoke halogen-free flame-retardant coaxial cable according to claim 1, is characterized by: said first outer shielding layer 7 is made of a tinned copper wire braided mesh, and said second outer shielding layer 8 is a polytetrafluoroethylene semiconductive tape.
    [7]
    7 . The polyethylene-insulated polyolefin sheathed, low-smoke halogen-free, flame-retardant coaxial cable according to claim 1, is characterized by: the raw materials of the inner sheath 9 in weight ratio: linear low-density polyethylene 2-5%, polyethylene-octene copolymer 5-10%, aluminum hydroxide 20- 50% and EVA resin 30-40%, silane coupling agent 0.7-1.5%, compatibilizer 2-5%, rheological agent 1-2%, halogen-free flame retardant 3-8%, antioxidants 3-8%, additives 1-3%.
    [8]
    The polyethylene-insulated polyolefin sheathed low-smoke halogen-free flame-retardant coaxial cable according to claim 1, characterized by: the aforementioned raw material of the outer sheath 10 in weight ratio: ethylene-vinyl acetate copolymer 55-65%, polyethylene 35-50%, carbon black 5-8 %, melamine polyphosphate 6-8%, modified aluminum hydroxide 55-65%, dicumyl peroxide 0.1-0.2%, vinyltrimethoxysilane 1.5-2%, polyethylene wax 1-2% talc 2-3%, UV absorber 0.5-0.6% and antioxidant 2-5 %.
    [9]
    9 . The polyethylene-insulated polyolefin sheathed low-smoke halogen-free flame-retardant coaxial cable according to claim 8, is characterized by: the aforementioned modified aluminum hydroxide is titanate-modified aluminum hydroxide, and the preparation method of the modified aluminum hydroxide is: placing the fine aluminum hydroxide powder and the titanate in a colloid mill to obtain activated aluminum hydroxide powder, and the mass ratio of the fine aluminum hydroxide powder to the titanate is 11-12:1, the particle size of the fine aluminum hydroxide powder is 1 µm, and then the activated aluminum hydroxide powder is put into a slow-rotating kneader, and spraying 200 -220 ml aluminum stearate concentration of 25% in ethanol solution on the activated aluminum hydroxide powder and the mixture is stirred and mixed at a speed of 250-300r/min for 10-15 minutes, after the mixing was completed, the temperature was raised up to 80-90°C, and continues to stir and mix at a speed of 600-700r/min. for 4-5 hours to obtain a modified aluminum hydroxide powder.
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    引用文献:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
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