238 results about "Low smoke zero halogen" patented technology

The invention discloses a high-temperature-resistant flame-retardant carbon fiber cable and an intelligent preparation method thereof, and relates to the technical field of power cables, and the cable is composed of a composite bearing core, a first / second electrical isolation belt, a stranded conductor, an annular composite bearing layer, a high-temperature-resistant main insulator and a low-smoke halogen-free outer sheath. The force bearing core is formed by bundling carbon fiber micro rods, elastic reset layers are arranged between the micro rods, micro-particle friction layers are formed on the outer surfaces of the micro rods, and a stable friction-rebound interface is constructed. A fire-resistant barrier, a phase change microcapsule filling layer and a fiber bragg grating can be arranged, and fire resistance, thermal peak suppression and on-line monitoring are considered. And closed-loop control of pultrusion, surface activation, coating and on-line thickness measurement / friction test is carried out in the manufacturing process. The cable can be operated at 200 DEG C for a long time and at 250 DEG C for a short time, the residual elongation is less than or equal to 0.10%, and light weight, high strength, high temperature resistance, low smoke and flame retardance are realized.

The invention discloses a crosslinked polyethylene low-smoke halogen-free flame-retardant power cable which comprises the following hierarchical structures: a conductor layer; an insulating layer; a shielding layer; the shielding layer takes polyethylene as a matrix and comprises the following components in parts by weight: 70-78 parts of matrix, 20-25 parts of carbon black and 2-5 parts of nano montmorillonite modified lignin, the thickness of the shielding layer is 0.8-1.2 mm, the shielding layer and the insulating layer are molded through a co-extrusion process, and the interface gap is less than or equal to 0.1 mm. The nano montmorillonite modified lignin is adopted as a core flame retardant, the addition amount is reduced by 10%-15% compared with that of a traditional halogen-free flame retardant, by taking a 120 mm civil cable as an example, 18 parts of modified lignin replace 25 parts of a traditional flame retardant with the same flame retardant effect, the raw material cost is reduced by 8%-12%, lignin is derived from agricultural and forestry wastes, dependence on a petroleum-based material is reduced, and the environment-friendly flame-retardant cable material is suitable for industrial production. The gradient cooling process shortens the cooling time by 20%-30% compared with the traditional single-section cold water cooling process, and meanwhile, the pre-crosslinking process reduces the subsequent forming internal stress and reduces the rejection rate.

The invention relates to the technical field of polyolefin cable materials, in particular to a photovoltaic weather-resistant anti-cracking low-smoke halogen-free flame-retardant polyolefin cable material and a preparation method thereof.The photovoltaic weather-resistant anti-cracking low-smoke halogen-free flame-retardant polyolefin cable material is prepared from, by weight, 90-150 parts of polyolefin resin, 1-3 parts of antioxidant, 2-5 parts of ultraviolet light absorber, 30-70 parts of composite flame retardant, 10-25 parts of carbon black and 3-5 parts of cross-linking agent; the composite flame retardant comprises a core material, a first shell material and a second shell material, the core material comprises a halloysite nanotube adsorbed with a flame retardant, the first shell material comprises epoxy resin, and the second shell material comprises maleic anhydride grafted polyethylene. According to the polyolefin cable material provided by the invention, the purpose of efficient flame retardance can be achieved by adding the halloysite nanotubes and the flame retardant system, the interfacial compatibility between the flame retardant and the matrix resin can be improved by adding the maleic anhydride grafted polyethylene, and the flame retardance of the polyolefin cable material can be improved by combining the added halloysite nanotubes and epoxy resin. The purpose of improving weather resistance, stress resistance and crack resistance of matrix resin is achieved.

The invention discloses a high-performance ship cable and a preparation process thereof, relates to the technical field of cables, and aims to solve the problem that an existing cable is insufficient in environmental adaptability, safety, electromagnetic compatibility and the like, the cable comprises a conductor, an insulating layer, a longitudinal waterproof structure, a shielding layer and a sheath layer from inside to outside, the conductor is of a multi-strand soft copper wire stranded structure, and the copper content of the multi-strand soft copper wire stranded structure is larger than or equal to 99.95%; the DC resistance at 20 DEG C is less than or equal to 0.01724 omega mm / m; the insulating layer is made of cross-linked polyethylene or polytetrafluoroethylene and can resist 1.5 times of rated voltage for 1 minute without breakdown; the longitudinal waterproof structure comprises a water-blocking tape and water-blocking paste; the shielding layer is of a double-layer structure, and the shielding effectiveness is larger than or equal to 60 dB The sheath layer is made of a low-smoke halogen-free flame-retardant material and contains an antioxidant and an ultraviolet light absorber, the preparation process comprises six steps of conductor preparation, insulating layer forming and the like, parameters are accurately controlled, the cable can work at the temperature of-40 DEG C to 85 DEG C, is salt-fog-resistant, waterproof and flame-retardant, is adaptive to the complex environment of ships and warships, and the operation reliability and safety are improved.

The invention relates to the technical field of high polymer materials, and particularly discloses a B1-grade low-smoke halogen-free flame-retardant polyethylene cable material and an extrusion molding process thereof. The invention discloses a B1-grade low-smoke halogen-free flame-retardant polyethylene cable material. The cable material is prepared from the following raw material components in parts by weight: 50 to 70 parts of linear low-density polyethylene, 50 to 70 parts of ethylene-vinyl acetate copolymer, 40 to 60 parts of nanoscale magnesium hydroxide, 5 to 8 parts of microencapsulated red phosphorus, 10 to 15 parts of intumescent flame retardant, 3 to 5 parts of zinc borate and 2 to 4 parts of carbon nanotubes. According to the cable material, the ethylene-vinyl acetate copolymer can improve the dispersing performance of the inorganic filler, the composite flame retardant composed of the nanoscale magnesium hydroxide, the microencapsulated red phosphorus and the intumescent flame retardant is utilized, and the synergistic effect of the zinc borate and the carbon nanotubes is matched, so that the obtained cable material has better flame retardance, and the release of smoke is less.

The invention relates to the technical field of high-performance polypropylene, and discloses a low-smoke halogen-free flame-retardant polypropylene material as well as a preparation method and application thereof in automobile wires and cables. The low-smoke halogen-free flame-retardant polypropylene material disclosed by the invention is prepared from the following components in parts by weight: 70 to 80 parts of polypropylene resin, 20 to 30 parts of microencapsulated ammonium polyphosphate and 0.15 to 0.35 part of antioxidant. The capsule wall of the microencapsulated ammonium polyphosphate contains polypropylene molecular chains and has good dispersity in polypropylene resin, the capsule wall of the microcapsule contains a large number of nitrogen-containing heterocyclic rings and can be used as a nitrogen flame retardant to play a synergistic flame-retardant role with ammonium polyphosphate, the flame-retardant and smoke-suppression performance of polypropylene is improved, and the flame-retardant and smoke-suppression performance of polypropylene is improved. Microencapsulated ammonium polyphosphate has good compatibility with polypropylene resin, the influence on the mechanical property of polypropylene is small, meanwhile, after being coated with the microcapsules, ammonium polyphosphate is not prone to absorbing moisture, and the polypropylene material is not prone to absorbing moisture and has high tensile strength.

The invention provides a high-shielding-property flame-retardant fire-resistant control cable and a preparation method thereof. The cable sequentially comprises a conductor core wire, a fire-resistant insulating layer, a composite shielding layer and a flame-retardant fire-resistant sheath layer from inside to outside, the invention discloses a preparation method of a traditional Chinese medicine. The flame-retardant fireproof sheath layer is prepared from the following raw materials: 35 to 45 parts of low-smoke halogen-free flame-retardant polyolefin, 15 to 20 parts of ethylene-vinyl acetate copolymer, 8 to 12 parts of polyolefin elastomer, 6 to 10 parts of magnetic montmorillonite-based hybrid electromagnetic shielding filler, 7 to 11 parts of core-shell type ceramic flame-retardant microcapsule, 1.0 to 1.5 parts of silane coupling agent, 2 to 4 parts of basalt fiber and 0.4 to 0.7 part of cross-linking agent. 0.6 to 1.0 part of lubricant, 0.7 to 1.1 parts of stabilizer and 0.3 to 0.6 part of antioxidant. The high-shielding flame-retardant fire-resistant control cable provided by the invention has excellent electromagnetic shielding, flame-retardant and fire-resistant properties, outstanding mechanical strength, good processing fluidity, effective inhibition of thermal degradation and oxidative degradation in high-temperature processing and use processes, and good heat resistance, dimensional stability and use stability.

The invention relates to a cable sheath material, and particularly discloses a weather-proof low-smoke halogen-free flame-retardant polyolefin cable sheath material and a preparation method thereof. The cable sheath material is prepared from 30 to 45 parts of low-density polyethylene, 10 to 30 parts of high-impact homo-polypropylene, 15 to 30 parts of graft modified flexibilizer, 30 to 50 parts of main flame retardant, 1 to 5 parts of coupling agent, 10 to 30 parts of phosphorus-nitrogen synergistic flame retardant, 4 to 10 parts of efficient smoke suppressant, 0.2 to 0.8 part of hindered phenol main antioxidant, 0.4 to 1.2 parts of thioester auxiliary antioxidant, 0.4 to 1.0 part of hindered amine light stabilizer, 0.5 to 1.5 parts of ultraviolet light absorber and 2.5 to 2.5 parts of weather resistance enhancer. 5.0 parts of a lubricant, 0.5 to 2.0 parts of a lubricant, and 0.1 to 0.8 part of an anti-copper agent. The mechanical property, the electrical insulation property and the weather resistance of the sheath material are effectively improved, an efficient synergistic flame retardant effect can be obtained, the flame retardant property is excellent, and a finished product can obtain excellent weather resistance, low-smoke zero-halogen property, flame retardant property, mechanical property, electrical insulation property and the like.

The invention discloses a production method of a high-structural-strength insulating steel tape armored multi-core power cable. The power cable comprises a conductor unit and an insulating layer from inside to outside, wherein the conductor unit is formed by twisting and pressing a conductor with a copper base material, the conductor unit is wrapped outside the conductor, the overlapping rate of the conductor unit is larger than or equal to 50%, and the insulating layer is formed by semi-conductive ceramic silicone rubber and / or crosslinked polyethylene. The double-layer wrapping tape is composed of ceramic silicone rubber filling strips and assists the insulating core wires to be twisted into a cable and is of a filling structure; an inner sheath made of a ceramic silicone rubber material; the composite armor layer is composed of an inner-layer galvanized steel band and an outer-layer stainless steel band; the buffer layer is composed of an aramid fiber woven mesh or a ceramic fiber belt; and the outer sheath is composed of ceramic silicone rubber or a low-smoke halogen-free flame-retardant material of which the oxygen index is greater than or equal to 40. The cable is high in structural strength, good in temperature resistance and high in impact resistance, high-temperature mechanical locking is achieved through tension-controlled double-layer reverse wrapping, and the performance of the cable is greatly improved.

The invention discloses a flame-retardant, low-smoke and halogen-free environment-friendly high-voltage power cable, which relates to the technical field of high-voltage power cables and comprises a central conductor, the central conductor is externally coated with an internal insulation protection layer, and the outer side of the central conductor is sequentially coated with an insulation shielding layer, a waterproof silica gel isolation layer and an outer rubber protection layer. The outer side of the outer rubber protection layer is coated with a flexible deformation silica gel layer, the flame erosion and spreading process is intercepted through active falling of the flame-retardant rubber clamping pieces, heat is taken away in the falling process of the flame-retardant rubber clamping pieces, and a local fire insulation belt is formed; and meanwhile, in the subsequent maintenance process of the cable, corresponding fusing separation adhesive tapes and flame-retardant rubber cards need to be replaced to complete repair, so that the overall fireproof performance of the cable is improved, and the cable is protected in different degrees in different degrees of fire environments by utilizing a strategy of coping with fire disasters through layer-by-layer separation, so that the service life of the cable is prolonged, and the service life of the cable is prolonged. And the maintenance cost of the cable is effectively reduced.

The invention discloses a halogen-free low-smoke flame-retardant polyolefin cable which comprises a composite cable core, a first flame-retardant wrapping tape layer, an inner sheath, a second flame-retardant wrapping tape layer, a waterproof layer, a metal sheath layer and an outer sheath which are sequentially arranged from inside to outside. The outer sheath is made of a ceramic polyolefin material which is extruded and covered on the metal sheath layer. According to the low-smoke halogen-free cable, the ceramic polyolefin outer sheath is introduced into the cable structure, so that the problems of sheath softening, insulating layer stripping, structure collapse and the like of a traditional low-smoke halogen-free cable during high-temperature combustion are effectively solved. The ceramic polyolefin material can be converted into a compact ceramic layer under the action of flame to form a firm heat insulation barrier, so that the integral structure of the cable is kept complete, flame spreading and conductor short circuit are prevented, and the fire resistance and continuous power supply performance are remarkably improved.

The invention discloses a low-smoke halogen-free flame-retardant cable, and belongs to the technical field of cables, the low-smoke halogen-free flame-retardant cable sequentially comprises a conductor layer, an insulating layer, an inner sheath, a flame-retardant isolation sleeve and an outer sheath from inside to outside, a spiral bulge is arranged between the flame-retardant isolation sleeve and the outer sheath to form a spiral air duct, the inner sheath comprises a flame-retardant sheath, a thermal expansion strip, a heat conduction rib and a flame-retardant strip, the thermal expansion strip forms a heat dissipation flow channel and can be thermally expanded to form a fireproof barrier, a flowable flame retardant is arranged in the flame-retardant strip, the outer sheath is provided with a stress release suite, the stress release suite comprises a fixing sleeve, a temperature sensing ring and an isolating ring and can release stress and achieve high-temperature early warning, and a release cylinder is arranged outside the flame-retardant isolating sleeve and can be matched with the flame-retardant strip to release the flowable flame retardant when a fire occurs. The cable has the dynamic self-adaptive flame-retardant capability, gives consideration to heat dissipation and stress release, is low-smoke and halogen-free, is high in safety, and is suitable for various scenes.

The environment-friendly nuclear power high-voltage power cable comprises a cable body, and the cable body comprises a conductor, a semi-conductive shielding layer, an insulating layer, a filling layer, a belting layer, a waterproof layer, an armor layer and an outer protective layer from inside to outside in sequence; the semi-conductive shielding layer is made of a low-smoke halogen-free cross-linked polyolefin semi-conductive material; the insulating layer is made of a radiation-resistant low-smoke halogen-free cross-linked polyolefin composite material; the filling layer is a low-smoke halogen-free polypropylene filling rope; the belting layer is made of a low-smoke halogen-free polypropylene and water-based butyl rubber composite material; the semi-conductive shielding layer tightly wraps the outer side of the conductor, the semi-conductive shielding layer is made of a low-smoke halogen-free cross-linked polyolefin semi-conductive material, is used for uniformizing an electric field on the surface of the conductive wire core and preventing point discharge, and is firmly bonded with the adjacent insulating layer, and the insulating layer is made of a radiation-resistant low-smoke halogen-free cross-linked polyolefin composite material, so that the radiation-resistant low-smoke halogen-free cross-linked polyolefin semi-conductive material has good radiation resistance. And the arrangement of the filling layer, the belting layer and the outer sheath layer improves the comprehensive performance of the cable body and meets the halogen-free, low-smoke, low-toxicity and environment-friendly requirements of the cable.

The invention relates to the field of nuclear cable manufacturing, in particular to a radiation-resistant cable for a nuclear power platform and a preparation method of the radiation-resistant cable. According to the nuclear cable, the five-layer structural design of conductor-insulation-shielding-polyimide film-sheath is adopted, the overlapping wrapping technology of the polyimide film is combined, and the comprehensive performance of the cable in the extreme environment of a nuclear power platform is comprehensively improved. The low-smoke halogen-free flame-retardant ethylene-propylene rubber is adopted as an insulating material, and through the cooperation of an EPDM / POE blending system and the ternary composite flame retardant, the insulating property is stable under the condition of ensuring radiation, and the flame retardant property is excellent. The sheath material is added with the intumescent flame retardant and the polysilazane modifier, so that the cable has no crack at the low temperature of-40 DEG C, the bending radius can be controlled to be less than 5 times of the outer diameter, and the cable is adaptive to the layout of a narrow cabin. Through the synergistic effect of material innovation and structural design, the balance of flame retardant property, mechanical property, radiation resistance, low temperature resistance, aging resistance and small-space applicability of the nuclear cable is realized.

The present disclosure provides a micro sheath buffer tube with rollable optical fiber ribbons for optical fiber cable to reduce the overall cable diameter. The buffer tube indicates one or more subunits, a micro sheath layer and a plurality of water swellable yarns. The one or more subunits encloses a plurality of optical fiber ribbons. Each optical fiber ribbon of the plurality of optical fiber ribbons includes 12 optical fibers. Further, each of a plurality of optical fibers is a colored optical fiber. In addition, the micro sheath layer surrounds the one or more subunits. Furthermore, the one or more subunits has a coating layer of low smoke zero halogen material.

The invention discloses a low-smoke halogen-free flame-retardant polyolefin sheath material and a preparation method thereof, and the method comprises the following steps: premixing an ethylene-vinyl acetate copolymer, metallocene linear low-density polyethylene, an ethylene-octene copolymer and a maleic anhydride grafted metallocene linear low-density polyethylene / ethylene-octene copolymer to obtain a premix; adding a flame retardant, an antioxidant and a lubricant, and mixing to obtain a mixture; the mixture is subjected to banburying processing, and a plastic melt is obtained; and carrying out extrusion granulation on the plastic melt to obtain the low-smoke halogen-free flame-retardant polyolefin sheath material. The high flame retardance, smoke suppression and mechanical strength of the sheath material can be improved.

The invention provides a low-smoke halogen-free high-flame-retardant power cable and a preparation method thereof, and the low-smoke halogen-free high-flame-retardant power cable comprises a conductor, an insulating layer and a sheath layer. The sheath layer is prepared from the following raw materials: 25 to 40 parts of ethylene-vinyl acetate copolymer, 15 to 25 parts of linear low-density polyethylene, 5 to 15 parts of metallocene polyethylene, 8 to 15 parts of reactive phosphorus-nitrogen-silicon hybrid compatibilizer, 12 to 22 parts of low-temperature sintered ceramic composite powder, 30 to 45 parts of surface-treated magnesium hydroxide, 15 to 25 parts of surface-treated aluminum hydroxide, 3 to 6 parts of organic modified montmorillonite and 1.5 to 2.5 parts of triallyl isocyanurate. 1.0 to 2.0 parts of a composite antioxidant, 1.0 to 2.5 parts of a calcium-zinc stabilizer and 0.5 to 1.5 parts of silicone master batch. The prepared low-smoke halogen-free high-flame-retardant power cable has excellent flexibility, mechanical property, heat resistance and processability, is stable in flame retardant property and stable in size, and is suitable for safety protection of power cables.

The utility model discloses a low-voltage fire-resistant control cable for a fire-fighting system, which comprises a sheath, a flame-retardant belt is fixedly arranged on the inner side of the sheath, a single-sided aluminum foil is fixedly arranged on one side of the flame-retardant belt far away from the sheath, an area is formed between one side of the single-sided aluminum foil and the flame-retardant belt, a grounding wire is arranged in the area, and a plurality of insulating wires are arranged in the single-sided aluminum foil. A conductor is arranged in the insulated wire and is a single-core pure copper conductor, the sheath is composed of two half sheaths, each half sheath comprises a base layer, the base layer is made of a flame-retardant ceramic low-smoke halogen-free sheath material, a flame-retardant layer is fixedly arranged on the outer side of the base layer, an insulating layer is fixedly arranged on one side, far away from the base layer, of the flame-retardant layer, and the flame-retardant layer is made of a flame-retardant ceramic low-smoke halogen-free sheath material. According to the utility model, the problems that the production efficiency is low, the cost is high, and the fireproof performance is easy to damage when the cable is bent due to the fact that mica tape wrapping is adopted in the traditional fireproof cable technology are solved.

The invention relates to the technical field of wires and cables, and discloses a complex electromagnetic interference resistant, bending resistant, flame retardant and fire resistant control cable. The cable sequentially comprises a composite functional conductor, a flame-retardant fire-resistant insulating layer, a fire-resistant wrapping layer, a composite shielding layer, a low-smoke halogen-free flame-retardant inner sheath, a flexible reinforced shielding layer and a low-smoke halogen-free flame-retardant outer sheath from inside to outside, and the composite shielding layer comprises a metal wire woven shielding layer and a metal belt wrapping shielding layer; the composite functional conductor comprises a conductive metal wire and a functional metal wire; the material of the flame-retardant fire-resistant insulating layer comprises a fluoropolymer material containing an inorganic ceramic filler; the flexible reinforced shielding layer comprises a metal conductive component and high-elasticity fibers; according to the invention, through conductor functional design, fire-resistant mechanism cooperation and multi-layer shielding structure optimization, stable work of the control cable in a complex electromagnetic environment, dynamic bending and fire working conditions is realized.

This invention relates to an EV cable material for charging piles. It comprises the following components and parts by weight: 45-55 parts polyvinyl chloride (PVC), 5-10 parts stabilizer, 35-50 parts plasticizer, 25-50 parts P83 rubber, 2-5 parts flame retardant, 10-20 parts propylene diene monomer (PPD) rubber, 10-25 parts TPU, 0.1-0.4 parts lubricant, 0.2-0.8 parts antioxidant, and 1-2 parts anti-aging agent. The EV cable material of this invention is soft to the touch, has good oil resistance, high tear strength, is lightweight, and has good flame retardancy. It does not require radiation cross-linking and can meet the long-term operating requirements of cables at 125°C, achieving a truly environmentally friendly flame-retardant material. Compared with thermosetting low-smoke halogen-free materials and other materials, it is a cost-effective alternative.

The invention relates to the technical field of wires and cables, in particular to a shielding type low-smoke halogen-free flame-retardant control cable and a preparation process, the shielding type low-smoke halogen-free flame-retardant control cable comprises a wire core unit group, a filling layer, a total shielding layer and a sheath layer from inside to outside in sequence, the wire core unit group comprises nine independent wire core units arranged according to '1 + 8' geometry, and each wire core unit is formed by twisting four insulating wire cores in pairs; each insulating wire core comprises a tinned soft copper conductor and a modified cross-linked polyolefin insulating layer, an aluminum-plastic composite belt sub-shielding layer is wrapped outside a wire core unit, the total shielding layer is an aluminum-plastic composite belt layer, a grounding wire core is embedded in the total shielding layer, and the sheath layer is a low-smoke halogen-free flame-retardant polyolefin layer. The control cable disclosed by the invention has the characteristics of low smoke, zero halogen, flame retardance, strong electromagnetic interference resistance and excellent mechanical property, the generation process is stable and controllable, and the control cable is suitable for industrial mass production and is suitable for industrial automation, precise instrument signal transmission and other scenes with strict requirements on environmental protection, safety and signal precision.

The application discloses a low-smoke halogen-free insulating material and a preparation method and application thereof, and relates to the field of cable materials. The low-smoke halogen-free insulating material comprises ethylene-vinyl acetate copolymer, polyethylene, modified flame retardant, polydopamine-coated ceramic oxide, antioxidant, crosslinking agent and processing aid, and the modified flame retardant is a flame retardant treated by bis(dioctyloxyphosphato) ethylene titanate. The application uses the modified flame retardant with low filling amount and the polydopamine-coated ceramic oxide to synergistically improve the flame-retardant and smoke-suppressing performance of the insulating material. The modified flame retardant is decomposed to generate oxides under heat to form an oxygen-blocking dense physical barrier. The polydopamine-coated oxides are heated to form a tough and stable heat-insulating ceramic-carbon composite layer. The modified flame retardant with low filling amount improves the compatibility and processing performance of the matrix, and comprehensively improves the flame retardation and mechanical strength of the material.

The invention discloses a low-smoke halogen-free flame-retardant cable for a charging pile, and belongs to the technical field of cables. The cable sequentially comprises a conductor, an insulating layer and an outer sheath layer from inside to outside, the conductor is formed by mutually twisting copper-tin alloy wires; the insulating layer is made of butadiene styrene rubber; the outer sheath layer is prepared from the following components in parts by weight: 40 to 60 parts of high-density polyethylene, 15 to 20 parts of acrylate rubber, 10 to 15 parts of ethylene-vinyl acetate copolymer, 8 to 10 parts of modified silicon dioxide, 3 to 8 parts of compatilizer, 1 to 2 parts of antioxidant and 1 to 2 parts of lubricant. The prepared modified silicon dioxide is used as a flame-retardant reinforcing component in the outer sheath layer, and the comprehensive performance of the low-smoke halogen-free flame-retardant cable for the charging pile can be remarkably improved.

This application relates to the field of cable material technology, specifically disclosing a low-smoke halogen-free flame-retardant cable material, its preparation method, and the cable thereof. The low-smoke halogen-free flame-retardant cable material comprises the following raw materials: 75-95 parts polypropylene resin; 20-35 parts POE elastomer; 18-30 parts compounded flame retardant; 10-18 parts aluminum hydroxide micropowder; 5-10 parts zinc stearate; 3-7 parts polydimethylsiloxane; 0.8-2.0 parts titanate coupling agent; 0.5-1.5 parts carbon nanotubes; 2.0-4.5 parts antioxidant; 3-6 parts stabilizer; and 1.5-4.0 parts nanoscale reinforcing agent. The cable material of this application improves flame-retardant performance while also maintaining good mechanical properties. The low-smoke halogen-free flame-retardant cable obtained from this cable material possesses excellent safety protection capabilities, minimizing fire risk and secondary hazards.

The invention relates to the technical field of cables, in particular to a high-performance flame-retardant cable, which comprises a cable core, a constraint structure and an outer sheath, and is characterized in that the constraint structure sleeves the outer surface of the cable core and is provided with a rigid part and a viscous part; the outer sheath sleeves the outer surface of the constraint structure; the outer sheath can adhere to the viscous part in a combustion state and is restrained by the rigid part so as to limit the expansion of the outer sheath in the circumferential direction. According to the invention, a low-smoke halogen-free inner sheath and flame-retardant glass fiber tape gap wrapping structure is additionally arranged between the cable core and the outer sheath, or a low-smoke halogen-free composite wrapping tape overlapping wrapping structure embedded with alkali-free glass fiber yarn or embedded with glass fiber gridding cloth is arranged between the cable core and the outer sheath; the expansion degree of the low-smoke halogen-free outer sheath in the high-temperature decomposition shell forming process during flame burning can be effectively reduced, burning drippings are completely eradicated, and no burning drippings can be stably achieved in the whole length of the cable.

A preparation process for a B1-grade high flame-retardant NS-type fire-resistant cable. On outer surfaces of copper conductors, overlap-wrapping is used and an insulating layer is extruded to obtain insulated cores; after a plurality of insulated cores are stranded into a cable, gaps within a cable core are filled with PP filler ropes for rounding; two layers of halogen-free flame-retardant tapes are wrapped around the outer surfaces of the cores and the fillers, argon arc welding is used to longitudinally wrap an aluminum tape and a corrugation treatment is performed to form an aluminum sheath; and finally, a ceramicized silicon rubber tape and a low-smoke halogen-free flame-retardant polyolefin sheathing material for low-heat-release cables are wrapped, thereby obtaining a finished cable.

The invention provides a photovoltaic cable and a manufacturing method thereof, and the photovoltaic cable comprises a conductor and an insulating layer which coats the outer side of the conductor; the outer side of the insulating layer is coated with the sheath layer; wherein the insulating layer and the sheath layer are both made of a high-flame-retardant low-smoke halogen-free cross-linked polyolefin material; the insulating layer and the sheath layer are integrally cross-linked and formed at one time through co-extrusion and electron beam irradiation; the sheath layer and the insulating layer are made of a high-flame-retardant low-smoke halogen-free cross-linked polyolefin material, and the co-extrusion and electron beam irradiation cross-linking process is combined, so that the properties of high flame retardance, low smoke, zero halogen, interlayer binding force and the like of the photovoltaic cable are ensured, the environmental protection property, the sealing property and the long-term stability of the photovoltaic cable are improved, and the layout of a home-entry photovoltaic system is met.

The utility model relates to an indoor tensile butterfly-shaped photoelectric composite cable, which comprises a loose tube type optical unit and two soft copper conductors symmetrically distributed on the left side and the right side of the loose tube type optical unit, the loose tube type optical unit comprises a PBT loose tube, two or four optical fibers are arranged in the PBT loose tube, and gaps are filled with fiber paste at the same time. The sectional area of each soft copper conductor is 0.5 mm2 to 1.5 mm2, a crosslinked polyethylene insulating layer is extruded outside each soft copper conductor, and the thickness of the crosslinked polyethylene insulating layer is 0.5 mm-0. 6mm. A layer of low-smoke halogen-free flame-retardant polyolefin sheath finished product is extruded outside the optical fiber unit and the insulated soft copper conductors. The cross section of the low-smoke halogen-free flame-retardant polyolefin sheath is butterfly-shaped, and the thickness of the low-smoke halogen-free flame-retardant polyolefin sheath is 0.6-0.7 mm. The photoelectric composite cable integrates the power wire core and the optical unit, the product size is reduced, the tensile property of the photoelectric composite cable is improved, and the service life of the photoelectric composite cable is prolonged.

The utility model discloses a flexible environment-friendly aluminum alloy core fireproof cable, and relates to the technical field of flexible environment-friendly aluminum alloy core fireproof cables. The outer surface of the first wrapping layer is fixedly connected with a first alkali-free glass fiber belt, the outer surface of the first alkali-free glass fiber belt is fixedly connected with a double-layer ceramic fireproof belt, and the outer surface of the double-layer ceramic fireproof belt is fixedly connected with a second alkali-free glass fiber belt; the outer surface of the second alkali-free glass fiber belt is fixedly connected with a flame-retardant layer, the outer surface of the flame-retardant layer is fixedly connected with a high-temperature-resistant layer, and the outer surface of the high-temperature-resistant layer is fixedly connected with a low-smoke halogen-free layer; the outer surface of the low-smoke halogen-free layer is fixedly connected with a corrosion-resistant layer, and the outer surface of the corrosion-resistant layer is fixedly connected with a second wrapping layer. The outer surface of the second wrapping layer is fixedly connected with an outer protective layer; the inner surface of the first wrapping layer is fixedly connected with a wire slot; a plurality of insulating layers are fixedly connected to the interiors of the wire grooves, and aluminum alloy conductors are fixedly connected to the interiors of the insulating layers.

The utility model discloses a low smoke halogen -free flame -retardant low -voltage cable relates to cable flame -retardant technical field, including flame -retardant cable wire insulation cover, cable storehouse, cable and conductor, the outer surface installation flame -retardant cable wire insulation cover of cable adopts low smoke halogen -free flame -retardant material such as crosslinked polyethylene, it has good insulating property and flame -retardant performance, can effectively prevent current leakage and short circuit, and reduce the generation of smoke and toxic gas when burning, three -point formula separation baffle will the inner portion of flame -retardant cable wire insulation cover into three parts, formed cable storehouse, to store and protect cable, cable cover is in the outer surface of oxygen -resistant layer, and oxygen -resistant layer adopts inorganic metal compound material, when cable combustion, oxygen -resistant layer is heated and is decomposed, releases crystallization water and other substances, absorbs a large amount of heat energy, thereby reducing the temperature of outer layer combustible and surrounding environment, makes the cable that ignites self -extinguish, and the conductor cover adopts the insulating material and is made to protect the conductor.