359 results about "Low smoke zero halogen" patented technology

The invention provides a low-smoke halogen-free flame-retardant cable material and a preparation method thereof, and belongs to the field of cable materials. The low-smoke halogen-free flame-retardant cable material is prepared from the following chemical components: 32 to 40 parts of nitrile rubber, 22 to 27 parts of natural rubber, 8 to 12 parts of benzoxazole-siloxane copolymer containing phosphate dynamic bonds, 13 to 15 parts of core-shell-sheath three-stage structure flame retardant, 4 to 6 parts of hexaphenoxy cyclotriphosphazene modified carbon nanotubes, 2 to 3 parts of europium-doped mesoporous cerium dioxide and 3 to 4 parts of nano zinc oxide. The composite material is prepared from the following components in parts by weight: 3 to 4 parts of carbon nanotube grafted montmorillonite hybrid, 2 to 3 parts of lubricant, 0.8 to 1.2 parts of cross-linking agent, 0.3 to 0.4 part of accelerant, 0.4 to 0.6 part of dicumyl peroxide and 0.1 to 0.2 part of antioxidant. Unification of high flame retardance, low smoke, excellent mechanical property and processability of the cable material is realized.

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 present invention proposes a B1-class halogen-free, low-smoke, flame-retardant special cable and its preparation method. The cable comprises: a cable core formed by wrapping a control core and a power core, a flame-retardant filling rope, a wrapping layer, a flame-retardant tape layer, a total shielding layer, a ceramic fireproof layer, and an outer sheath. The present invention uses a cross-linked polyethylene sheath to form an outer layer of protection, a ceramic fireproof layer to form an intermediate shell flame-retardant insulation layer, and a flame-retardant tape layer combined with expandable graphite as an inner layer of buffer insulation, thereby achieving multiple flame-retardant insulation for the cable core, inhibiting the release of burning drips and toxic smoke with corrosion, and meeting and exceeding the B1-class flame-retardant requirements. By using low-smoke, halogen-free materials, the release of toxic gases can be reduced during combustion. At the same time, a double-layer hardness flame-retardant filling rope is twisted in the core to make the cable more round as a whole, and to allow the flame-retardant material to be fully filled into the cable core, achieving a better flame-retardant effect, and having certain buffering, compression resistance, torsional resistance, and fatigue resistance effects, thereby improving the mechanical properties of the cable.

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 discloses a drippage-free polypropylene-based low-smoke halogen-free flame-retardant cable material and a preparation method thereof, and belongs to the field of flame retardance of high polymer materials. The invention aims to solve the problems of low flame-retardant efficiency and poor mechanical and physical properties of the existing polypropylene-based low-smoke halogen-free cable material. The composite material is prepared from the following components in parts by weight: 0-100 parts of thermoplastic polypropylene, 10-50 parts of maleic anhydride grafted polypropylene, 0-80 parts of aluminum hydroxide, 0-30 parts of expanded graphite, 0-30 parts of elastomer and 0.1-3 parts of antioxidant. According to the polypropylene-based low-smoke halogen-free flame-retardant cable material, LOI can be not lower than 31.5%, vertical combustion can reach V-0 level under the UL-94 standard, drippings are not generated during combustion, and the polypropylene-based low-smoke halogen-free flame-retardant cable material is environmentally friendly, low in smoke and even free of smoke in the flame-retardant process and has excellent mechanical performance.

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 power cables, and discloses a high-flexibility high-temperature-resistant fireproof cable which comprises a conductor, an insulating layer, a shielding layer, an inner sheath layer, a fireproof layer and an outer sheath layer which are sequentially arranged from inside to outside, the conductor is formed by twisting multiple strands of fine copper wires, the surface of each fine copper wire is plated with a layer of tin, the insulating layer is made of a silicon rubber material, and the shielding layer is made of a silicon rubber material. A nanoscale magnesium hydroxide flame retardant and a high-temperature-resistant additive are added into the silicone rubber material; the shielding layer is a copper wire braided shielding layer; the inner sheath layer is made of a polyurethane material; the fireproof layer comprises a ceramic silicone rubber layer and a mica tape wrapping layer which are arranged in sequence; according to the scheme, the conductor is stranded by multiple strands of fine copper wires, and the diameter, the stranding pitch and the tension are optimized, so that the cable keeps excellent flexibility in frequent bending and moving environments, and the conductor is prevented from being broken. The tin coating improves the oxidation resistance and the welding performance, and ensures the long-term stability of electrical connection.

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 an elastic composite shielding cable for a ship and a preparation process thereof, and aims to solve the problems of poor environmental adaptability, low shielding effectiveness, insufficient elasticity and unstable process of an existing ship cable. The cable sequentially comprises a conductor layer, an insulating layer, a composite shielding layer and a sheath layer from inside to outside, wherein the conductor layer is formed by twisting a plurality of strands of superfine tinned oxygen-free annealed copper wires, and two 1500D aromatic polyamide fiber elastic cores are arranged in the center of the conductor layer; the insulating layer is made of ethylene propylene rubber or thermoplastic elastomer, and the dielectric constant is not more than 3.0; the composite shielding layer is of a double-layer structure of aluminum-plastic composite tape wrapping and tinned copper wire weaving, and the shielding effectiveness of the X wave band is larger than or equal to 30 dB. The sheath layer is of a chloroprene rubber or polyurethane double-layer structure, tests such as C5-M-grade salt mist are carried out, the preparation process comprises the steps of conductor twisting, insulation extrusion, composite shielding forming and the like, various parameters are accurately controlled, the bending radius of the cable is smaller than or equal to 6D, and the cable is stable in performance after being repeatedly bent for 1000 times, low in smoke, halogen-free, flame-retardant, adaptive to severe environments of ships, stable in process and high in reliability. And reliable operation of ship equipment can be ensured.

The invention relates to the technical field of materials, and discloses a high-flame-retardancy low-smoke halogen-free cable sheath material and a preparation method thereof.The cable sheath material is prepared by taking a polyvinyl base material as a main raw material and taking a flexibilizer, a flame retardant and the like as auxiliary materials through mixing and extrusion processes; wherein the flame retardant is prepared by cross-linking galactomannan by using a triazine derivative containing a phosphorus flame-retardant element in the structure as a cross-linking agent, the galactomannan can be used as a carbon source, a triazine ring can be used as a nitrogen source, and the phosphorus flame retardant can be used as an acid source, so that a three-element integrated intumescent flame-retardant system can be formed, and the flame-retardant effect is good when combustion occurs. An expanded carbon layer can be rapidly formed on the surface of the sheath material, the expanded carbon layer can effectively isolate oxygen, heat and a fire source, then the flame retardant property of the sheath material is effectively improved, the aerogel structure has rich pores, smoke formed by combustion can be effectively absorbed, and the flame retardant property of the sheath material is improved. Therefore, low-smoke halogen-free modification of polyethylene is realized.

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 relates to the technical field of cable materials, and particularly discloses a low-smoke halogen-free flame-retardant cable material and a preparation method thereof. The low-smoke halogen-free flame-retardant cable material is prepared from 100 parts of polyolefin blended resin, 10 to 20 parts of polyphenyl ether, 3 to 8 parts of glycidyl methacrylate grafted POE, 1 to 3 parts of hyperbranched polyesteramide, 50 to 80 parts of a flame retardant, 5 to 15 parts of silicone powder, 0.5 to 1.5 parts of an antioxidant and 0.05 to 0.2 part of an organic zirconium compound. The preparation method comprises the following steps: uniformly mixing the raw materials to obtain a mixture; and adding the mixture into a twin-screw extruder, carrying out melt extrusion by the twin-screw extruder, cooling, granulating, and drying to obtain the low-smoke halogen-free flame-retardant cable material. The mechanical property and temperature resistance of the low-smoke halogen-free flame-retardant cable material can be improved.

The invention discloses a double-layer synergistic low-smoke halogen-free flexible cable which comprises a cable conductor, a low-smoke halogen-free polyolefin insulating layer, a shielding layer and a TPU sheath layer which are sequentially coated from inside to outside, the shore A hardness of the low-smoke halogen-free polyolefin insulating layer is 60-70, and the shore A hardness of the TPU sheath layer is 80-90; the double-layer synergistic low-smoke halogen-free flexible cable realizes the full-structure low-smoke halogen-free characteristic based on the coordination of the insulating layer and the sheath layer, has better flexibility, wear resistance and weather resistance, and can be stably used for a long time under severe conditions such as frequent bending, friction or long-term exposure.

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.

A flame-retardant cable includes at least one core having a conductor and at least one protecting layer surrounding the core. The protecting layer is made from a low smoke zero halogen (LS0H) flame-retardant polymer composition having at least 70 phr of a polyethylene homopolymer or copolymer having a density lower than 0.90 g / cm3 as a halogen-free polymeric base, 100 to 800 phr of at least one metal hydroxide, and at least 10 phr of a tannin.

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.

The utility model discloses a granulator for processing a low-smoke halogen-free flame-retardant polyolefin cable material, which belongs to the technical field of cable material processing, and comprises a processing box for processing the low-smoke halogen-free flame-retardant polyolefin cable material, and a granulating assembly for granulating the low-smoke halogen-free flame-retardant polyolefin cable material is arranged on the inner top wall of the processing box; the granulating assembly comprises a rotating rod and a plurality of granulating cutters for granulating the low-smoke halogen-free flame-retardant polyolefin cable material, and the side surface of the rotating rod is connected with the plurality of granulating cutters; the filtering assembly comprises a filtering ring and a circular-ring-shaped scraper, the bottom face of the scraper is connected with the filtering ring, the inner side wall of the filtering ring is connected with a filtering net, the bottom face of the filtering ring is connected with two connecting plates, the bottom faces of the connecting plates are connected with the moving ends of electric push rods, the fixed ends of the electric push rods are provided with limiting plates, and the side faces of the two limiting plates are connected with the machining box; according to the utility model, the cable material is subjected to multiple pelletizing processing by bumping up the cable material, so that the pelletizing processing quality of the cable material is improved.