555 results about "Low smoke zero halogen" patented technology

The invention provides a tear-resistant, wear-resistant, low-smoke and non-dripping sheath material as well as a preparation method and application thereof. The tear-resistant wear-resistant low-smoke non-dripping sheath material is prepared from the following components in parts by weight: 25 to 35 parts of metallocene linear low-density polyethylene, 10 to 15 parts of ethylene-vinyl acetate copolymer, 6 to 8 parts of compatilizer, 50 to 60 parts of aluminum hydroxide, 10 to 15 parts of magnesium hydroxide, 3 to 4 parts of microencapsulated red phosphorus, 5 to 8 parts of lithium oxide synergist, 4 to 6 parts of silicone master batch, 0.3 to 0.7 part of carbon black master batch and 1.5 to 2.5 parts of coupling agent. The tear-resistant wear-resistant low-smoke non-dripping sheath material provided by the invention has the characteristics of being halogen-free, flame-retardant, tear-resistant and wear-resistant, and a low-smoke halogen-free flame-retardant power cable prepared from the sheath material has the characteristics of high smoke light transmittance during combustion, no dripping and cracking resistance.

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 relates to a low-smoke halogen-free flame-retardant polyolefin insulation material for an in-vehicle high-voltage cable. The low-smoke halogen-free flame-retardant polyolefin insulation material comprises the following raw materials in parts by mass: 30-50 parts of SEBS, 30-50 parts of an ethylene-propylene-butylene block copolymer elastomer, 10-20 parts of a polyethylene grafted maleic anhydride compatilizer, 3-5 parts of color master batch, 1.5-2.5 parts of an antioxidant, 110-130 parts of aluminum hydroxide, 1.5-3 parts of phosphorus-containing silane, 1-2 parts of a cross-linking agent and 3-5 parts of silicone master batch. The SEBS is in the form of an unoil-filled particle; the aluminum hydroxide is powdery and is modified by phosphorus-containing silane; the cross-linking agent is a polyfunctional group cross-linking sensitizer, and the number of functional groups is not less than 2. The preparation method of the insulating material comprises the following steps: S1, modifying aluminum hydroxide powder by using phosphorus-containing silane; s2, uniformly mixing the matrix resin; s3, granulating by adopting a double-screw extruder with a large length-diameter ratio; s4, the materials obtained in the step S3, the materials obtained in the step S1 and other raw materials are subjected to banburying and double-stage production granulation, and a finished product is obtained.

The invention discloses an environment-friendly safe low-smoke halogen-free cable, and relates to the technical field of cables, the environment-friendly safe low-smoke halogen-free cable comprises a cable assembly, the cable assembly comprises an outer sheath, the outer surface of the outer sheath is fixedly communicated with an air outlet assembly, a plurality of conductors are arranged in the outer sheath, each conductor is hollow, and the outer surface of the outer sheath is fixedly communicated with the air outlet assembly. A plurality of filling pipes are arranged among the exteriors of the plurality of conductors, and the plurality of filling pipes are hollow; according to the environment-friendly safe low-smoke halogen-free cable, when the temperature of air around the cable is low, cold air enters the hollow conductor from the air inlet, air convection is formed in the conductor, heat is taken away and then discharged from the air outlet, and when excessive heat is generated in the use process of the conductor, the heat can enter the filling pipe through the multiple drainage holes, so that the cable is protected. And heat can flow in the conductor, so that excessive local heat dissipation of the conductor can be prevented.

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 relates to the technical field of cable materials, and particularly discloses a silane crosslinking low-smoke halogen-free flame-retardant polyolefin cable material for a photovoltaic cable and a preparation method of the silane crosslinking low-smoke halogen-free flame-retardant polyolefin cable material. The invention relates to a preparation method of a silane crosslinked low-smoke halogen-free flame-retardant polyolefin cable material for a photovoltaic cable, a material A and a material B are blended according to a mass ratio of (80-90): (10-20), the material A is prepared by mixing and banburying ethylene-vinyl acetate copolymer, metallocene polyethylene, a compatilizer, a flame retardant, a precursor, an antioxidant, a lubricant, a dispersing agent, an initiator and a vulcanizing agent, and the material B is prepared by mixing and banburying the ethylene-vinyl acetate copolymer, the metallocene polyethylene, the compatilizer, the flame retardant, the precursor, the antioxidant, the lubricant, the dispersing agent, the initiator and the vulcanizing agent. The material B is prepared by mixing and banburying an ethylene-vinyl acetate copolymer, a compatilizer, a delivery compound, a flame retardant, an antioxidant and a catalyst. The prepared silane crosslinked low-smoke halogen-free flame-retardant polyolefin cable material for the photovoltaic cable has the advantages of cracking resistance and good mechanical property in a cold and hot and optical radiation comprehensive environment.

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 cable materials, in particular to a low-smoke halogen-free flame-retardant polyolefin cable material and a preparation process thereof. The low-smoke halogen-free flame-retardant polyolefin cable material is obtained by uniformly mixing the ethylene-vinyl acetate copolymer, the polyethylene, the compatilizer, the halogen-free flame retardant, the fuming inhibitor, the carbon black, the lubricant and the antioxidant and carrying out extrusion granulation. The low-smoke halogen-free flame-retardant polyolefin cable material comprises the following components in parts by weight: 60-80 parts of an ethylene-vinyl acetate copolymer, 20-40 parts of polyethylene, 10-20 parts of a compatilizer, 50-60 parts of a halogen-free flame retardant, 15-30 parts of a fuming inhibitor, 5-10 parts of carbon black, 1-3 parts of a lubricant and 1-2 parts of an antioxidant. The low-smoke halogen-free flame-retardant polyolefin cable material prepared by the invention has excellent mechanical properties, flame retardance and aging resistance.

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 relates to the technical field of polymer insulating materials, in particular to a flexible low-smoke halogen-free polypropylene insulating material and a preparation method thereof. The invention discloses an ultra-soft low-smoke halogen-free polypropylene insulating material, which comprises the following components in parts by weight: 50-80 parts of block co-polypropylene; 10 to 40 parts of organic silicon rubber; 0.06 to 0.24 part of a bis-2, 5 vulcanizing agent; the material further comprises an antioxidant, a compatilizer, a flame retardant, a flame retardant synergist, a lubricant and the like. The insulation material provided by the invention is good in flexibility and convenient to install and lay under the condition of ensuring that the polypropylene cable material meets flame-retardant energy absorption and electrical insulation properties. The preparation method of the insulating material adopts a dynamic vulcanization technology, and the organic silicon rubber is distributed in the polypropylene material in a'sea-island 'or'sea-sea' structure, so that the hardness of the matrix resin is reduced on the premise of ensuring the mechanical property of the material. Meanwhile, a surface modification mode of the flame retardant is optimized, so that the hardness of the material is further reduced. And the odor emission of the material in the production and use processes can be effectively reduced, so that the material is more environment-friendly.

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 utility model discloses a high-flame-retardant fireproof power cable, relates to the technical field of power cables, solves the problems that a device is only provided with a substance with water-blocking performance, does not have fireproof capability, and cannot keep a power supply line continuously, safely and stably running under a flame condition, and comprises a first cable. According to the utility model, the outer side of the cable is sleeved with the low-smoke halogen-free polyolefin sheath, so that the wire cable can be protected when a fire disaster occurs, the harm of harmful substances such as smoke and toxic gas generated by the wire cable in the fire disaster to a human body is reduced, the transmission performance of the wire cable is ensured, the fire-resistant time is further prolonged, and the service life of the wire cable is prolonged. And the cross-linked polyethylene insulating layer is protected by the flame-retardant sheath layer, so that the flame-retardant time is further prolonged, the cable has higher fire resistance, and the problems that the device is only provided with a water-blocking substance, does not have fire resistance and cannot keep a power supply line continuously, safely and stably running under a flame condition are solved.

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 low-smoke halogen-free self-crosslinking cable material for a photovoltaic cable and a preparation method of the low-smoke halogen-free self-crosslinking cable material. The low-smoke halogen-free self-crosslinking cable material for the photovoltaic cable is prepared from the following components in parts by weight: 40 to 50 parts of ethylene-vinyl acetate copolymer, 20 to 30 parts of polyolefin elastomer resin, 10 to 15 parts of linear low-density polyethylene, 3 to 5 parts of modified montmorillonite, 3 to 5 parts of magnesium hydroxide, 5 to 10 parts of vinyl siloxane, 0.5 to 2 parts of initiator, 1 to 2 parts of antioxidant, 1 to 2 parts of ultraviolet light absorber, 0.1 to 5 parts of compatilizer, 0.5 to 3 parts of lubricant and 0.1 to 1 part of antioxidant. And 0.3 part of a catalyst. According to the cable material provided by the invention, through collaborative design of a modified montmorillonite / magnesium hydroxide flame-retardant system, a silane self-crosslinking technology and an anti-aging functional aid, triple breakthrough of flame-retardant high efficiency, weather-resistant long-term effect and environmental protection safety is realized.

The invention relates to an industrial low-smoke halogen-free fire-resistant low-voltage cable applied to the field of cables, which comprises a fire-resistant low-voltage cable body, the outer end of the fire-resistant low-voltage cable body is sleeved with an opening bending sheath in a sliding manner, and a bending clamping split body, the opening bending sheath, a bending regulation and control strip and a bending regulation and control system are adopted to be matched. The automatic bending regulation and control function of the self-adaptive fire-resistant low-voltage cable body parameters can be effectively achieved, the actual bending radius of the fire-resistant low-voltage cable body is effectively recognized and analyzed according to the fire-resistant low-voltage cable body parameters and the actual laying parameters, self-adaptive regulation is conducted on the actual bending radius, and the self-adaptive fire-resistant low-voltage cable body bending regulation and control function is achieved. Therefore, the fire-resistant low-voltage cable body is effectively prevented from being damaged in the bending construction process, the application performance of the fire-resistant low-voltage cable body is ensured, the laying difficulty of the fire-resistant low-voltage cable body can be reduced and the laying efficiency can be improved through the automatic bending regulation and control effect, and the application benefit of the fire-resistant low-voltage cable body is further promoted.

The invention discloses an overwater photovoltaic low-smoke halogen-free polyolefin composition as well as a preparation method and application thereof. The polyolefin composition comprises the following components in parts by weight: 15-90 parts of polyolefin resin; 3 to 10 parts of polyolefin grafted maleic anhydride; 50 to 100 parts of a halogen-free flame retardant; 0.3 to 2 parts of a coupling agent; 0.3 to 1 part of an amphiphilic surfactant; 0.5 to 2 parts of a crosslinking auxiliary agent; wherein the content of vinyl acetate in the polyolefin resin is 14 wt%-26 wt%; the hydroxyl value of the amphiphilic surface active agent is 25 to 60 mgKOH / g. According to the invention, the polyolefin resin is selected as matrix resin, the content of vinyl acetate in the polyolefin resin is adjusted, the amphiphilic surfactant with a specific hydroxyl value is added, and the coupling agent is combined, so that the prepared polyolefin composition has better water breakdown resistance, and is particularly suitable for a water photovoltaic cable sheath material.

The invention relates to a B1-grade high-flame-retardant NS type fireproof cable preparation technology, and belongs to the technical field of cables. According to the preparation technology of the B1-level high-flame-retardant NS type fireproof cable, after the insulated wire cores wrap copper and are stranded into the cable, gaps of the cable core are filled with PP filling ropes to be round, the cable core is wrapped with two layers of halogen-free flame-retardant belts, the cable core is longitudinally wrapped with an aluminum belt through argon arc welding, and the aluminum sheath is formed through embossing treatment; and finally, the ceramic silicone rubber tape and the low-smoke halogen-free flame-retardant polyolefin sheath material for the low-heat-release cable are lapped, so that the finished cable is obtained, the sealing performance, the fire resistance, the impact resistance and other performance of the cable are improved through treatment of multi-layer lapping, ceramic silicone rubber tape preparation and the like, the same fire resistance performance is met, and meanwhile the service life of the cable is prolonged. The B1-level high-flame-retardant NS type fireproof cable has the characteristics of impact resistance and spraying resistance, has better safety performance, and can relieve pressure for fire rescue and strive for greater opportunities for personnel escape when a fire occurs.

The invention discloses a manufacturing method of a second type low-smoke halogen-free standard wall cable of a motor train unit, which relates to the technical field of cables and comprises the steps of conductor preparation, insulation extrusion, buffer isolation layer forming, shielding layer manufacturing, reinforced core preparation and installation, sheath extrusion and post-processing. The conductor is prepared by layering and twisting cerium-titanium alloying copper monofilaments and treating the cerium-titanium alloying copper monofilaments through a nano ceramic coating; post-processing detection shows that the cable is small in bending radius, low in electrical and mechanical performance attenuation rate after repeated bending, excellent in electrical performance, mechanical performance, fireproof performance, environmental protection performance and the like, capable of effectively meeting the cable use requirements under complex working conditions of the motor train unit, capable of guaranteeing the operation reliability and safety, capable of improving the comprehensive performance of the cable and wide in application range. The cable is suitable for power and signal transmission in rail transit fields such as motor train units.

The utility model discloses a bending-resistant two-layer twisted marine symmetrical fireproof communication cable, which comprises an outer-layer cable core body formed by uniformly distributing eight twisted-pair cable cores at intervals in the circumferential direction through an EPDM (Ethylene-Propylene-Diene Monomer) isolation core frame, and the center part of the EPDM isolation core frame is provided with a center hole. Four twisted-pair wire cores and PP resin filling core strips are twisted and jointly wrap an inner longitudinal wrapping layer of a modified silicone rubber ceramic mica fire-resistant composite belt to form an inner-layer wire core body, and the inner-layer wire core body is sleeved with the center hole. And a nylon tape wrapping layer, a copper wire braided shielding layer, a low-smoke halogen-free polyolefin inner sheath layer, a modified silicone rubber ceramic mica fire-resistant composite tape outer longitudinal wrapping layer, a high-temperature glass fiber wire wrapping layer and a low-smoke halogen-free polyolefin outer sheath layer are sequentially wrapped outside the outer-layer wire core body. According to the cable, the 12 pairs of twisted wire cores are arranged in two layers through the isolation core frame, the cable core structure is round and neat, the bending resistance is better, the fire resistance and flame retardance are better, the safety and reliability of the cable are enhanced, and the durability is better.

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 cable wires, and discloses a high-flame-retardant cable wire and a preparation method thereof. Comprising the following cable raw materials in parts by weight: 100 parts of ethylene propylene diene monomer, 30-40 parts of low-density polyethylene, 20-35 parts of modified nano magnesium hydroxide, 2-4 parts of an ultraviolet light initiator, 0.5-5 parts of a phosphorus-nitrogen flame-retardant assistant crosslinker, 0.5-1.2 parts of an antioxidant and 1-2 parts of a lubricant. Vulcanizing by a press vulcanizer, carrying out ultraviolet irradiation crosslinking, and extruding into a wire rod by an extruder. After the phosphorus-nitrogen flame-retardant assistant cross-linking agent and the modified nano magnesium hydroxide are cross-linked with the ethylene propylene diene monomer, the polyethylene and the like, a flame-retardant effect is achieved through synergistic cooperation, so that the prepared cable wire has relatively good flame-retardant property and relatively good mechanical property, is low-smoke, halogen-free, safe and environment-friendly, and is suitable for large-scale industrial application.

The invention discloses an industrial low-smoke halogen-free fireproof low-voltage cable, and relates to the technical field of low-voltage cables, an upper welding strip plate is fixedly mounted in the middle of the top end of an upper arc-shaped fitting block, and auxiliary stable supporting blocks are symmetrically mounted at the two ends of the top of the upper welding strip plate; arc-shaped anti-collision guide blocks are fixedly installed at the positions, located on the two sides of the auxiliary stable supporting block, of the two ends of the upper welding strip plate, a lower welding strip plate is fixedly installed in the middle of the bottom end of the lower arc-shaped attaching block, and trapezoidal limiting frames are symmetrically and fixedly installed at the bottom end of the lower welding strip plate. The labor intensity of carrying the cable is reduced, the placing stability of the laid cable is improved, the problems that the cable rolls and inclines to influence normal wiring or the cable rolls down from a high place to cause safety problems are solved, and after the cable slides down, a pulling pressure is generated at a wiring position to easily cause short circuit to cause a fire hazard; the cable placement stability is improved, and the cable use safety can be effectively improved.

The utility model relates to the technical field of radiation cables, in particular to an anti-nuclear radiation cable, which comprises a wire core, an inner insulating layer is fixedly connected to the outer surface of the wire core, a low-smoke halogen-free flame-retardant insulating material is fixedly connected inside the inner insulating layer, and a first shielding layer assembly is fixedly connected to the outer surface of the inner insulating layer. When the anti-nuclear radiation cable is used, the surface of the second core insulating layer is connected with the first anti-radiation layer, the first anti-radiation layer is composed of the lead-based alloy foil, and lead is a metal with large density and high atomic number, so that nuclear radiation can be effectively absorbed and blocked; a barrier is formed through the high-density characteristic of the lead-based alloy foil, penetration of radiation to the internal structure of the cable is remarkably reduced, the surface of the insulating layer is connected with the second anti-radiation layer, and the second anti-radiation layer is composed of a film, so that the nuclear radiation shielding capability of the cable is further enhanced, and the effect of resisting intense radiation is achieved.

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 cables, in particular to a multi-layer co-extrusion cable based on a low-smoke halogen-free flame-retardant composite layer and a preparation method of the multi-layer co-extrusion cable based on the low-smoke halogen-free flame-retardant composite layer, and the multi-layer co-extrusion cable structurally comprises a conductor layer, a double-layer insulating layer, a reinforced buffer layer and a composite sheath layer from inside to outside in sequence; wherein the double-layer insulating layer comprises an inner layer and an outer layer; the inner layer takes an ethylene-octylene copolymer as a core layer and takes a norbornene dianhydride grafted polyether ester elastomer as a shell layer, so that the material is endowed with high elasticity and impact resistance, and the cracking of the insulating layer is inhibited; the modified nano montmorillonite is dispersed into a nano lamellar barrier, so that heat diffusion is delayed, and low smoke and zero halogen are realized; the outer layer is composed of an ethylene-methyl acrylate matrix and di-tert-butyl phosphinic acid aluminum salt, the di-tert-butyl phosphinic acid aluminum salt is decomposed at high temperature to generate aluminum phosphate, a carbon layer is formed to isolate oxygen heat, and phosphorus-containing free radicals capture active free radicals to interrupt flame propagation.

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 discloses a flame-retardant and wear-resistant low-smoke halogen-free material and a preparation method thereof, and belongs to the technical field of polyacrylate processing.The preparation method comprises the following steps that cured polyacrylate, flame-retardant capsules and auxiliary materials are added into a double-screw extruder to be subjected to melt extrusion, and the flame-retardant and wear-resistant material is obtained; the flame-retardant capsule is prepared and cross-linked with a modified polyacrylate chain segment, so that the wear resistance of the material is remarkably enhanced, the material structure damage is repaired at room temperature, the shell layer is decomposed to release water at high temperature, and the shell layer and a core layer monomer are synergistically matched to form a flame-retardant layer; the prepared flame-retardant curing agent reacts with a flame-retardant polyacrylate chain segment to form a five-membered ring structure to enhance the wear resistance of the material, and the flame-retardant structure cooperates with flame-retardant groups on a flame-retardant capsule, a five-membered ring and an organic chain segment to enhance the flame retardance of the material.

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.