603 results about "Cross-linked polyethylene" patented technology

The invention relates to the technical field of cross-linked polyethylene cable accessories, and discloses a cross-linked polyethylene insulated cable overhead installation device which comprises a wire supporting rod, a hoisting steel cable, a cross-linked polyethylene insulated cable and a driving assembly, the driving assembly comprises a steel cable clamping block and a cable clamping block, and a steel cable pulley and a cable pulley which are vertically symmetrical are arranged in the driving assembly; a pushing assembly is arranged at the top of the steel cable clamping block and comprises a supporting transverse plate, a first telescopic rod, a rectangular frame, an upper supporting rod and a lower supporting rod, and locking clamps are sleeved outside the supporting transverse plate, the first telescopic rod, the rectangular frame and the upper supporting rod. When the driving assembly is pulled, the roller encoder measures the distance and controls the distance; the pushing assembly drives step by step, the steel cable clamping blocks are fixed firstly, then the cable clamping blocks are pushed by the same distance and then fixed, the clamps are pulled in a matched mode to be tightened, the device achieves accurate control over the distance between the clamps and the looseness of the cables, the cables are prevented from being too loose and abraded or too tight and damaged, the water blocking function is protected, the line stability is improved, and the operation and maintenance cost is reduced.

In some embodiments, a cable can include an electrically conductive inner core. A first insulation layer can be disposed about the inner core. An electrically conductive layer can be disposed about the first insulation layer. A second insulation layer can be disposed about the electrically conductive layer. A first polymer jacket can be disposed about the second insulation layer. The first polymer jacket can include a first layer of armor strength members disposed therein. A second polymer jacket can be disposed about the first polymer jacket. The second polymer jacket can include a second layer of armor strength members disposed therein. An outer polymer jacket can be disposed about the second polymer jacket. At least one of the first polymer jacket, the second polymer jacket, and the outer polymer jacket can be formed from an aliphatic polyketone polymer, an ethylene-propylene copolymer, a polyolefin elastomer, a polypropylene, or a cross-linkable polyethylene.

The invention relates to the technical field of wires and cables, and discloses a fire-resistant cable based on an overhead photovoltaic system, a braided ring in a fire-resistant flame-retardant layer is formed by winding flame-retardant crosslinked polyethylene fibers, air circulation is guaranteed by virtue of a large number of pores among ropes, and when the fire-resistant cable is burnt by flame, high-temperature gas enters the space of the braided ring, and then the braided ring is sealed. On the other hand, the liquid drainage rod is pulled through contraction traction force, the piston disc is promoted to extrude the flame-retardant liquid in the storage sleeve, after the liquid is sprayed out through the liquid drainage holes, one part of the liquid directly acts on a flame area for fire extinguishing and flame retarding, and the flame-retardant effect is achieved. Most of the materials are adsorbed and retained by the porous structure of the braided ring, are gradually decomposed at a continuous high temperature to release flame-retardant gas, and react with braided ring fibers to form a liquid-state and solid-state composite heat-insulating layer to fill tiny pores which are still remained after shrinkage, so that the integrity of a cable circuit at the initial stage of a fire disaster is guaranteed.

The invention relates to the technical field of crosslinked polyethylene insulated power cables, in particular to a flame-retardant and insulated low-voltage power cable and a preparation method and application thereof. The flame-retardant and insulating low-voltage power cable comprises the inner core layer, the filler layer, the belting layer, the lining layer, the metal armor layer and the outer sheath layer from inside to outside, and the multiple layers can effectively protect the inner core and endow the cable with better performance; in addition, low-density polyethylene, a furan modified polyethylene compatilizer, a reactive flame retardant, bismaleimide, dicumyl peroxide and an auxiliary are adopted to obtain the cross-linked polyethylene material for the cable outer sheath, and the cross-linked polyethylene material has excellent insulation, flame retardance, strength, toughness and repairing performance.

The invention relates to the technical field of cables, in particular to a cross-linked polyethylene insulated power cable for a humanoid robot, which comprises a plurality of groups of conductors, a heat insulation and heat conduction structure, a sheath, a heat dissipation structure and a power cable, and the insulating layer is arranged on the sheath and is in contact with the heat-insulating heat-conducting structure inside the sheath. The conductors are separated through the partition plates and the partition edge strips on the partition plates, and the situation that heat cannot be dissipated effectively due to the fact that the cable cores are attached together is avoided. By means of the heat conduction strips embedded in the separation edge strips and the heat conduction aluminum foil layers making contact with the heat conduction strips, heat generated by the conductors can be conducted outwards, and heat concentration in the cable is avoided. Through the heat dissipation structure which is arranged on the cable joint and is in contact with the heat-conducting aluminum foil layer, heat in the heat-conducting aluminum foil layer can be rapidly taken away through the cooling channel in the heat dissipation structure, so that the purpose of heat dissipation is achieved.

The invention discloses a cross-linked polyethylene insulated control cable, and relates to the technical field of cross-linked polyethylene insulated cables, the cross-linked polyethylene insulated control cable comprises an insulating shell, a notch is formed in the middle of the top surface of the insulating shell, a sealing ring and a protective sleeve are arranged in the middle of the left side and the right side of the insulating shell, and the protective sleeve is fixed on the inner wall of the sealing ring; the inner wall of the protective sleeve is provided with a tear-resistant filler, the inner wall of the tear-resistant filler is provided with a plurality of cross-linked polyethylene insulating layers, the inner walls of the cross-linked polyethylene insulating layers are provided with copper cores, the ends, close to each other, of the copper cores are fixedly connected, the insulating tape is wound on the outer walls of the copper cores, and the outer walls of the copper cores are fixedly connected with the cross-linked polyethylene insulating layers. The calcium chloride block in the top cover is conveniently replaced by a maintainer, so that the problem that the maintenance effect of the crosslinked polyethylene insulated control cable is poor due to the fact that the calcium chloride block is inconvenient to replace in the maintenance process of the crosslinked polyethylene insulated control cable is solved.

This invention relates to the field of cable technology and discloses a torsion-resistant cross-linked polyethylene (XLPE) insulated cable suitable for scenarios involving intermittent winding and static cycles, such as cable logistics warehousing and mobile emergency equipment. Existing technologies, designed for continuous winding, cannot address the residual stress generated by the rigidity of cross-linked polyethylene in intermittent scenarios, nor the aging and crack propagation problems caused by the coupling of residual stress with the environment. This invention incorporates a gradient porous stress-relieving layer outside the conductor, releasing residual stress and strengthening interfacial bonding through modulus transition and chemical adhesion; the XLPE insulation layer is modified with EVA to reduce rigidity and reinforced with nano-silica; and a self-healing layer containing directional microcapsules and carbon nanotubes is incorporated outside the insulation layer to achieve precise crack repair and anti-aging, reducing insulation cracks, conductor breakage, and shielding failure during intermittent winding and static cycles, ensuring the cable's reliability in the target scenarios.

The invention relates to the technical field of power cables, and provides a crosslinked polyethylene aluminum alloy cable with a reinforcing structure, which comprises a cable body, the cable body is erected on a plurality of cable brackets, a plurality of conductors which are arranged in a stranded manner are arranged in the cable body, and a crosslinked polyethylene insulating layer is coated outside each conductor. A filling layer is arranged between every two conductors, a belting layer is wrapped outside the filling layer, the cable further comprises a reinforcing layer, a braid layer, a sheath layer and a flexible supporting structure, the reinforcing layer is wrapped outside the belting layer, the braid layer and the sheath layer are sequentially wrapped outside the reinforcing layer, and the flexible supporting structure is installed on the cable support. The problems that in the prior art, due to the influence of the weight of a cable, as time goes on, the cable is bent downwards, and when bending reaches the limit, the internal structure of the cable is prone to deformation and damage due to excessive stretching are solved.

The invention relates to the technical field of material detection, in particular to a cross-linked polyethylene insulation material impurity full-detection device and system for a high-voltage cable and application, the detection device carries out detection based on single-row continuous flowing insulation material particles, and the detection device comprises a near infrared spectrum imaging unit, a visible light imaging unit and an image processor, and identifying black spot impurities and heterochromatic particles. The full-detection system provides a detection channel for installing full-detection equipment and comprises a current limiting pipe body and a camera obscura structure, and reflection spectrum and surface color information are collected in the camera obscura structure; the full-inspection system further comprises a buffer stock bin, a finished product stock bin, a pneumatic sorting module, a cyclone separator, a cooling fluidized bed and a metal separator. Impurity identification reliability is guaranteed through double optical detection, full-process online detection of insulation material impurities can be achieved, limitation of traditional sampling detection is broken through, full-detection coverage of insulation material particles is achieved, the impurity missing detection risk is eliminated, and the strict requirement of an ultrahigh-voltage cable for insulation material cleanliness is fundamentally met.

The invention relates to the technical field of cable processing, and discloses a mica tape cross-linked polyethylene insulated cable which comprises a copper conductor, a mica tape, a cross-linked polyethylene insulating layer, a filling material, a wrapping layer and a cable sheath from inside to outside, the mica tape comprises mica paper, a reinforcing material and an adhesive, and the adhesive comprises tung maleic anhydride type mica glue and MgO / gamma-Al2O3 composite filler. The adhesive adopted by the mica tape comprises the MgO / gamma-Al2O3 composite filler and the tung maleic anhydride type mica glue, and the MgO / gamma-Al2O3 composite filler can improve the heat conductivity coefficient and the dielectric property of the tung maleic anhydride type mica glue, so that the heat conductivity and the insulativity of the mica tape are improved.

The application discloses a crosslinked polyethylene insulated control cable and relates to the technical field of crosslinked polyethylene insulated cables.The application comprises an insulating shell, a protection sleeve and an insulating adhesive tape.The middle of the top surface of the insulating shell is provided with a notch, and the middle of the left and right sides of the insulating shell is provided with a sealing ring.The protection sleeve is fixed on the inner wall of the sealing ring.The inner wall of the protection sleeve is provided with tear-resistant filling.The inner wall of the tear-resistant filling is provided with a plurality of crosslinked polyethylene insulation layers.The inner wall of the crosslinked polyethylene insulation layer is provided with a copper core.The copper core is fixedly connected at the end close to each other.The insulating adhesive tape is wound on the outer wall of the copper core.The calcium chloride block in the top cover can be conveniently replaced by maintenance personnel, so that the problem that the crosslinked polyethylene insulated control cable is inconvenient to replace the calcium chloride block during maintenance and causes poor maintenance effect of the crosslinked polyethylene insulated control cable is avoided.

The invention belongs to the technical field of power cables, and particularly relates to an anti-bending flexible cable and a preparation method thereof.The cable sequentially comprises a conductor, an insulating layer, a buffer layer, a shielding layer and a protective layer from inside to outside, the insulating layer is divided into an inner layer, a middle layer and an outer layer in the radial direction, and the inner layer of the insulating layer comprises the following components in parts by weight; 100 parts of crosslinked polyethylene, 6-10 parts of amino-modified photoresponse graphene quantum dots, and 2-4 parts of a plasticizer DOS; 2-3 parts of amino modified photoresponse graphene quantum dots, 100 parts of crosslinked polyethylene and 2-4 parts of a plasticizer DOS; the protective layer comprises the following components in parts by weight; the insulation layer comprises 100 parts of shape memory polyurethane, 15-22 parts of composite microspheres and 0.5-1.0 part of a light stabilizer, and the insulation layer adopts a cross-linked polyethylene, amino modified light response graphene quantum dot gradient distribution and plasticizer system; and three-channel co-extrusion and three-section type ultraviolet curing are matched, so that inner layer under-crosslinking / outer layer over-crosslinking is avoided.

The application provides a crosslinked polyethylene insulating material with intrinsic self-repairing and recyclable characteristics, a preparation method and application thereof, and relates to the technical field of cable materials.The crosslinked polyethylene insulating material with intrinsic self-repairing and recyclable characteristics is prepared from the following components in parts by weight: 99.7 parts by weight of low-density polyethylene, 1.0-2.6 parts by weight of peroxide, 0.1-0.5 parts by weight of antioxidant, 5-20 parts by weight of maleimide monomer, 0.35-0.7 parts by weight of catalyst, 0.5-3.0 parts by weight of ligand and 0.5-3.0 parts by weight of furan-based small molecule.The low-density polyethylene is functionally modified through catalytic amination reaction, so that the chain breaking and crosslinking in the modification process are avoided, and the mechanical properties, insulating properties and dielectric properties of the crosslinked polyethylene are enhanced through the post-absorption of the introduced peroxide.Meanwhile, the dynamic reversible Diels-Alder reaction introduced by the post-absorption of the furan-based small molecule enables the polyethylene insulating material to have good intrinsic self-repairing effect on mechanical damage and electrical damage.

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 silane self-crosslinking polyethylene overhead insulation material for a cable and a preparation method. The insulating material comprises a polyethylene base material, a silane coupling agent, a catalyst, an antioxidant, a nanoscale reinforcing filler, a core-shell structure filler and nano montmorillonite. The polyethylene base material is a blend of polyethylene with different densities and can give consideration to rigidity and toughness; the nanoscale reinforcing filler is nano calcium carbonate modified by silane; the core-shell structure filler takes nano calcium carbonate as a core and an ethylene-octylene copolymer as a shell, so that the processing fluidity can be improved, and the filler agglomeration can be avoided; the nano montmorillonite can improve the aging resistance and the electrical insulation strength. The preparation method comprises the steps of nano filler pretreatment, nano montmorillonite modification, polyethylene base material blending, component mixing, crosslinking and post-treatment, through the pretreatment, modification, optimized mixing and crosslinking processes, it is ensured that all components are evenly dispersed, compatibility is improved, and the processing performance, the mechanical performance and the electrical performance of a finished product are balanced.

The invention relates to the technical field of power cables, and provides a cross-linked polyethylene insulated power cable with an anti-seismic function, which comprises a cable body, the cable body is composed of a plurality of stranded wires, an insulating layer is arranged outside each wire, a filling layer and a belting layer are sequentially arranged outside the plurality of wires, and the insulating layer is arranged outside the plurality of wires. The cable comprises a cable body and further comprises a sheath layer, fixing seats, upper fixing frames, supporting assemblies and buffering assemblies, the sheath layer comprises an inner sheath and an outer sheath, the cable body is provided with a plurality of fixing seats, each fixing seat is provided with one upper fixing frame, the supporting assemblies are arranged between each fixing seat and the corresponding upper fixing frame, each fixing seat is provided with one buffering assembly, and the buffering assemblies are arranged on the supporting assemblies. According to the technical scheme, the problem that in the prior art, when a cross-linked polyethylene insulated power cable is arranged near a factory workshop or in a tunnel or other positions where vibration is likely to be generated, vibration can affect the cable through the ground or a supporting structure, and the cable is damaged is solved.

The invention relates to the technical field of cables, and discloses a multilayer flame-retardant heat-conducting crosslinked polyethylene cable structure and a preparation process thereof. The product sequentially comprises a conductor layer, a heat-conducting flame-retardant buffer layer, a flame-retardant reinforced linkage layer and an outer sheath layer from inside to outside, wherein the heat-conducting flame-retardant buffer layer comprises a cross-linked polyethylene matrix, boron nitride, aluminum hydroxide and a shape memory polymer, and the outer surface of the heat-conducting flame-retardant buffer layer is provided with interlocking bulges with embedded heat-conducting microtubes; the flame-retardant reinforced linkage layer contains a cross-linked polyethylene matrix, expanded graphite and graphene, and a groove with a flame-retardant elastic piece is formed in the inner surface of the flame-retardant reinforced linkage layer. The preparation method comprises the following steps: firstly preparing the silver-plated conductor, then respectively preparing the heat-conducting flame-retardant buffer layer and the flame-retardant reinforced linkage layer, then aligning the two layers, carrying out hot-pressing compounding, carrying out irradiation crosslinking on the composite structure, and finally extruding and coating the outer sheath and carrying out cooling shaping. The product can be used in scenes of new energy power stations, data centers and the like, and has the advantages of synergism of flame retardance and heat conduction and long-term stability of an interlayer structure.

The invention relates to an insulating material, in particular to a nano composite insulating material, an insulated cable and an insulation defect repairing robot. The nano composite insulating material comprises core-shell particles, modified montmorillonite and crosslinked polyethylene, wherein each core-shell particle is provided with a core layer and a shell layer. The insulating layer of the insulated cable is made of the nano-composite insulating material. The insulation defect repairing robot can utilize the insulation defect repairing material to repair the crack defect of the insulation layer of the related cable. The material can automatically repair cracks under the action of an electric field and a thermal field, repeated repair for more than five times is achieved, micro defects smaller than or equal to 100 microns can be automatically repaired in the cable operation process, 90% of unplanned power failure faults are reduced, and the whole life cycle fault cost is reduced by 60%.

The utility model belongs to the technical field of cables, and particularly relates to a crosslinked polyethylene nano-composite power cable, which comprises a cable core, an insulating layer is arranged on the outer side of the cable core, and a buffer layer is filled between the insulating layer and the cable core; a flame-retardant layer is arranged on the outer side of the shielding layer, and a heat preservation layer is arranged on the outer side of the flame-retardant layer. By arranging the insulating layer, the shielding layer, the flame-retardant layer, the heat preservation layer, the anti-freezing layer and the wear-resistant layer, protection on the cable core can be effectively enhanced, and the cable has excellent cold resistance, good insulating performance, good flame retardance, improved wear resistance and pressure resistance when in use; therefore, the service life of the cable is prolonged.

This power cable is provided with: a conductor; and an insulating layer that is provided so as to cover the outer periphery of the conductor and that is configured from a resin composition containing polyethylene. The insulating layer contains, among polyethylene, a crosslinked polyethylene that is insoluble in xylene at 120° C, and uncrosslinked polyethylene that can be eluted in xylene at 120° C. The uncrosslinked polyethylene has a number average molecular weight of 5000 to 25000.

The invention discloses a self-sensing temperature monitoring cable, method and system for a smart power grid, and the cable comprises a central bearing core and a conductive unit which is twisted on the central bearing core in a surrounding manner. A spiral distributed sensing unit is embedded in a gap of the conductive unit; the distributed sensing unit is formed by compounding a plurality of modified optical fibers and an insulating material; according to the invention, through the curvature conformal design of the gap matching type fan-shaped distributed sensing units and the conductive units, the millimeter-level temperature sensing precision is realized, the problem that the diameter of a cable is increased due to a traditional external sensor is eliminated, and the sensor is compatible with a standard laying pipeline; by utilizing the characteristic that the insulating layer is made of a cross-linked polyethylene base material doped with nano aluminum oxide and the directional heat-conducting micro-channel, the temperature rise rate of a local overheat area is reduced, and the insulation aging is obviously delayed; the physical coordinate reference is established by using the sheath positioning protrusions, the problem of position calibration in distributed temperature measurement is solved, the positioning error is small, and the traceability efficiency of cable fault points is greatly improved.

Multi-ply structures incorporating adhesive compositions, products produced from such structures, and methods of producing the structures.

The invention relates to the technical field of special cable manufacturing, in particular to a corrosion-resistant power cable and a preparation method thereof.The corrosion-resistant power cable is composed of a copper conductor, a conductor shielding layer, a crosslinked polyethylene insulating layer, an insulating shielding layer, a metal shielding layer, a lining layer, an armor layer and an outer sheath; the surface of the copper conductor is plated with a nickel-phosphorus alloy, and the outer sheath contains low-density polyethylene, an ethylene-vinyl acetate copolymer, nano zinc oxide, a rare earth cerium compound and a silane coupling agent; the insulating layer is prepared through silane crosslinking, the armor layer is a galvanized steel strip or a steel wire, the metal shielding layer is wrapped by a copper strip or a copper wire, and the lining layer is made of polyethylene or a halogen-free material. The outer sheath is high in corrosion resistance, the conductors are resistant to oxidation, the insulation eccentricity is low, the stability is improved through the shielding and armoring structure, the insulation performance is optimized through the cross-linking technology, the preparation technology is suitable for industrial production, the qualified rate of finished products is high, and cost is low.

The invention relates to the technical field of cable production, and discloses a new energy charging heat-conducting flame-retardant cable which sequentially comprises a conductor layer, a heat-conducting insulating layer, a self-healing layer, a shielding layer, a mechanical enhancement layer and a flame-retardant outer sheath layer from inside to outside. The conductor layer is formed by a plurality of stranded tin-plated copper wires or nickel-plated copper wires; the heat-conducting insulating layer is composed of a crosslinked polyethylene matrix, a two-dimensional heat-conducting filler and phase-change temperature-adjusting microcapsules, the two-dimensional heat-conducting filler comprises a mixture of boron nitride nanosheets oriented by an electric field and graphene, and the mass fraction of the filler is 40%-55%; a core material of the phase-change temperature-adjusting microcapsule is a compound of paraffin and stearic acid. According to the scheme, trace rare earth and silver elements are introduced into the conductor to form a Cu-Ag-RE solid solution structure, so that the crystal integrity and the oxidation resistance of the conductor are remarkably improved; the structure still keeps excellent conductivity and bending resistance at high temperature, so that the cable can stably operate for a long time in a high-temperature and strong ultraviolet environment during charging, and the conductivity efficiency is improved.

The invention discloses a cross-linked polyethylene insulated fire-resistant flame-retardant power cable, relates to the technical field of power cables, and solves the problems that a power cable in the prior art is poor in sheath wear resistance, poor in flame retardant property and easy to degrade in insulating property. Comprising a cable core base layer, the cable core base layer comprises a conductor layer, the conductor layer comprises a plurality of conductors distributed in an extending mode, and each conductor is formed by twisting oxygen-free copper filaments; the insulating layer wraps the conductor layer, and the insulating layer is made of a cross-linked polyethylene material; the cable also comprises a shielding structure layer, the shielding structure layer comprises a conductor shielding layer and an insulation shielding layer, and the conductor shielding layer wraps each conductor and is used as an inner shielding layer. According to the design of the power cable, the XLPE power cable can work under the designed field intensity for a long time, and also has high reliability, low partial discharge and excellent fire-resistant and flame-retardant expansion capability, so that the stability of power transmission is ensured.

The invention discloses an acid-resistant nanofiltration membrane and a preparation method thereof, and belongs to the technical field of membrane separation. The gradient heterojunction active layer is formed on the base film through sequential interfacial polymerization and comprises a polysulfonamide bottom layer adjacent to the base film and a polyamine-metal organic framework composite layer located on the polysulfonamide bottom layer; the gradient heterojunction active layer is coated with the pH response self-repairing layer, and the self-repairing layer comprises pH response type microcapsules dispersed in cross-linked polyvinyl alcohol hydrogel; the membrane has excellent self-repairing capability and maintenance convenience, the repairing efficiency of artificial microcosmic damage in an acid environment within 24 hours can reach 85% or above, tiny scratches and defects generated in the operation or installation process of the membrane can be automatically repaired, the failure of the whole membrane element caused by tiny damage expansion is avoided, and the service life of the membrane element is prolonged. And the unplanned shutdown risk and the special repair and maintenance cost are reduced.

The invention provides a thermosensitive color-changing crosslinked polyethylene pipe and a preparation method thereof. The thermochromic crosslinked polyethylene pipe comprises the following components in parts by weight: 100 parts of polyethylene, 30-50 parts of epoxidized soybean oil, 0.5-2 parts of nano titanium dioxide, 3-8 parts of a compatilizer, 1.5-5 parts of a thermochromic pigment, 0.5-1.2 parts of an antioxidant and 0-3 parts of a functional additive, the cross-linking degree of the thermosensitive color-changing cross-linked polyethylene pipe is reduced from inside to outside in a gradient mode. By adding epoxidized soybean oil as a dispersing agent into a polyethylene matrix and performing interface modification through nano titanium dioxide, under the combined action, the interfacial tension between the pigment and the polyethylene matrix is reduced, the dispersing performance of the pigment in the polyethylene matrix is improved, and the heat sensitivity and mechanical strength of the crosslinked polyethylene pipe are remarkably improved; and gradient cross-linking distribution is further combined, so that the bursting pressure of the cross-linked polyethylene pipe is further improved.

The invention discloses an anti-torsion cross-linked polyethylene insulated power cable applied to the field of cables, which comprises a petal framework composite structure comprising hollow strips, a main support layer and a buffer layer, and an outer layer protection structure formed by branch protection rings and an elastic metal net. The problems that in the prior art, a cable is prone to structural damage and performance degradation under the torsion working condition are solved, a main supporting layer in a petal framework disperses torsion stress through deformation, a buffer layer absorbs impact energy, a hollow supporting layer provides structural rigidity, and the main supporting layer, the buffer layer and the hollow supporting layer form an elastic supporting-buffer energy absorption-rigid stability synergistic system; therefore, the cable with the petal framework composite structure has excellent torsion resistance. And meanwhile, dynamic heat dissipation and temperature regulation and control are realized through fluid circulation of the hollow supporting layer and the sensing array, and the structural integrity and transmission stability of the wire core under complex working conditions are guaranteed.

The invention belongs to the technical field of polymer materials and electric wires and cables, and discloses a high-toughness cable composite material and a preparation method and application thereof. The preparation method comprises the following steps: (1) adding silane-terminated liquid polybutadiene, hydroxyl silicone oil and an organic tin catalyst into an anhydrous solvent, uniformly mixing, heating to 80-100 DEG C, carrying out dealcoholization condensation reaction, and evaporating to remove the solvent after the reaction is completed, so as to obtain an organic silicon modified polybutadiene cross-linking agent; and (2) adding the obtained organic silicon modified polybutadiene cross-linking agent, PE, EVA, a reinforcing filler and an initiator into an extruder in an oxygen-free atmosphere, carrying out melt blending cross-linking reaction, and carrying out extrusion molding to obtain the high-toughness cable composite material. Compared with a conventional vinyl silane cross-linking agent, the organic silicon modified polybutadiene cross-linking agent disclosed by the invention can remarkably improve the mechanical strength, flexibility and weather resistance of the obtained cross-linked polyethylene composite material.

The application relates to the technical field of power cables, and discloses a coal mine-used cross-linked polyethylene insulated power cable and a preparation method thereof. The coal mine-used cross-linked polyethylene insulated power cable comprises, from inside to outside, a cable core, an inner lining layer, an armoring layer and an outer sheath layer. The cable core comprises, from inside to outside, a conductor, a conductor shielding layer, a cross-linked polyethylene insulation layer and an insulation shielding layer. The outer sheath layer comprises the following components in parts by weight: 55-70 parts of polyvinyl chloride, 15-30 parts of thermoplastic polyurethane, 12-18 parts of a plasticizer, 0.3-0.5 parts of an antioxidant, 0.8-1.6 parts of a lubricant, 15-20 parts of a filler, 1-3 parts of maleic anhydride grafted polyethylene and 0.5-1.0 parts of a coupling agent. The filler comprises perlite loaded yttrium and tin composite oxides. The above technical scheme solves the problem of insufficient flame retardance of the coal mine-used cross-linked polyethylene insulated power cable in the prior art.