152 results about "Thermal aging" patented technology

The invention provides an acetylacetone-based composite thermal stabilizer which is a mixture obtained by mixing zinc acetylacetonate, calcium acetylacetonate or magnesium acetylacetonate and hydrotalcite pro rata. The composite thermal stabilizer is suitable for chloride-containing high polymer, such as polyvinyl chloride, chlorinated polyethylene, chlorinated polyvinyl chloride, copolymer of vinyl chloride-ethylene or copolymer of vinyl chloride-vinyl acetate, has better thermal stability, prolongs the thermal aging time of the chloride-containing high polymer, and overcomes the shortcomings of poor long-term performance of single stabilizer of zinc acetylacetonate, poor transparency of stabilizer of calcium acetylacetonate, and poor initial colorability of stabilizer of hydrotalcite. The composite thermal stabilizer has low cost, good initial colorability, excellent long-term performance and good transparency, and is an efficient composite thermal stabilizer.

The invention relates to the technical field of power cables, in particular to a heat-aging-resistant crosslinked polyethylene insulated power cable and a preparation method thereof. The cable comprises conductor wire cores, an insulating layer, a filling layer, a composite function layer, a steel tape armoring layer and a sheath layer from inside to outside. The insulating layer is composed of semi-conductive crosslinked polyethylene, silicone resin, nano montmorillonite and an HALS light stabilizer; the filling layer is composed of plasticized glass fabric, polyphenylene sulfide and rare earth oxide; the composite functional layer sequentially comprises a heat-conducting inner layer, a flame-retardant middle layer and an anti-UV outer layer from inside to outside; the sheath layer is composed of polyolefin, white carbon black, ceramic silicone rubber, a flame retardant, polyethylene wax and an initiator. According to the cable, cross-linked polyethylene and silicone resin are preferably selected as heat-resistant materials, heat conduction / flame retardance / UV resistance / armored multi-layer synergistic protection is achieved, the mechanical barrier performance is improved, meanwhile, damage of thermal stress to internal materials is reduced, comprehensive improvement of thermal aging resistance is achieved, and the cable is suitable for high-temperature, high-humidity and frequent thermal cycle harsh environments.

The invention relates to the technical field of thermoplastic vulcanizates, and discloses a TPV sealing material and a preparation method thereof. The TPV sealing material is prepared from the following raw materials in parts by weight: 10 to 30 parts of PP resin, 40 to 60 parts of EPDM rubber, 10 to 20 parts of polylactic acid, 15 to 25 parts of filler, 0.5 to 1.5 parts of vulcanizing agent, 0.3 to 1.5 parts of vulcanization accelerator, 5 to 10 parts of compatilizer, 1 to 4 parts of modified heat stabilizer and 0.5 to 3 parts of modified anti-aging agent. Through preparation of the modified heat stabilizer, structural damage or sealing failure caused by thermal aging of a system can be reduced, and the service life of the sealing material is greatly prolonged; the preparation of the modified anti-aging agent can effectively resist the corrosion of environmental factors such as thermal oxidation and ozone to the system, and prevent the problems of cracking, hardening, elasticity attenuation, sealing failure and the like of the sealing material after long-term use.

The invention relates to the technical field of insulation paper fatigue life calculation, and discloses an insulation paper fatigue life calculation method, system and device considering a force accumulation effect, and a medium, and the method comprises the steps: building a three-phase three-winding model based on a power transformer; short-circuit current waveforms are obtained through circuit sampling and serve as excitation to be given to all windings of the three-phase three-winding model; and calculating the distribution of the short-circuit electrodynamic force on the windings of the three-phase three-winding model, and calculating the deformation condition of the windings after being subjected to the short-circuit electrodynamic force to obtain the current fatigue life of the insulation paper. According to the method, the three-phase three-winding model is constructed, the short-circuit current waveform and the distribution of the short-circuit electrodynamic force on the windings are obtained, the fatigue life of the insulation paper is further obtained, thermal aging of the insulation paper is considered, force accumulation damage caused by short-circuit impact is also brought into a calculation model, and the calculation precision is further improved.

The invention relates to a photo-thermal aging resistant photovoltaic cable and a preparation method thereof, and belongs to the technical field of high polymer materials. The photo-thermal aging resistant photovoltaic cable is composed of a conductor wire core, and an insulating layer, a filling layer and an outer sheath which are sequentially coated on the outer side of the conductor wire core, the outer sheath is prepared from the following raw materials in parts by weight: 80-120 parts of polyvinyl chloride resin, 3-5 parts of a modified anti-aging agent, 2-8 parts of a modified flame retardant, 1-3 parts of dioctyl phthalate, 10-20 parts of nano silicon dioxide, 1-3 parts of butyl stearate and 3-5 parts of zinc stearate; the photo-thermal aging resistant photovoltaic cable prepared by the invention not only has good ultraviolet ray and thermal aging resistant effects, but also has an excellent flame retardant effect.

The invention discloses an insulation residual life prediction algorithm and device based on real-time temperature acquisition and a medium, and relates to the technical field of new energy automobiles, and the method mainly comprises the steps: constructing an offline insulation failure database through an accelerated thermal aging experiment of a twisted pair sample, and recording the PDIV of a target motor at a brand new state room temperature as an initial PDIV0; based on the off-line insulation failure database, obtaining the aging slope of the PDIV decaying along with the aging time at each motor winding temperature and a corresponding aging curve; according to the mapping relation between the PDIV and the motor winding temperature, obtaining an insulation threshold voltage corresponding to the current motor winding temperature under the correction of a temperature correction coefficient; and based on the current PDIV0 and the insulation threshold voltage, substituting the aging curve corresponding to the current motor winding temperature to obtain and output the difference value of the corresponding insulation failure time of the two as the insulation residual life. The method can accurately capture the initial characteristics of insulation aging, the early warning time is advanced, and the timeliness is improved.

The invention discloses a high-weldability modified TPU film and a preparation method thereof, and belongs to the technical field of high polymer material modification. The film comprises the following components: 100 parts by weight of TPU resin; 1-5 parts by weight of a filler with a particle size of 1-5 [mu] m after surface treatment; 0.5 to 1.2 parts by weight of an antioxidant; wherein the filler subjected to surface treatment is obtained by cleaning a filler raw material with an oxalic acid solution and coating the filler raw material with a titanate coupling agent for surface treatment. The filler subjected to surface treatment is added, and an optimized melt extrusion process is combined, so that the welding strength of the film is remarkably improved, the heat sealing stripping force is greatly improved, and the problem that a welding surface is easy to crack is thoroughly solved; meanwhile, the intrinsic performance of TPU is perfectly reserved, the elongation at break is maintained, the transparency decrease amplitude is small, the thermal aging resistance is excellent, and the double requirements for high-strength welding and flexibility maintaining in the fields of automobile sealing parts, electronic packaging and the like are completely met.

The invention relates to the field of rubber composite materials, and particularly discloses a cold-resistant rubber composition and a preparation method thereof. The invention discloses a cold-resistant rubber composition. Comprising the following raw materials in parts by weight: 35-50 parts of natural rubber NR, 14-22 parts of epoxidized natural rubber ENR, 30-50 parts of butadiene rubber BR, 7-12 parts of a plasticizer, 2-6 parts of PVC modified silicone rubber, 4-7 parts of zinc oxide, 2-4 parts of stearic acid, 2-6 parts of nano clay, 1-2 parts of a silane coupling agent, 10-20 parts of white carbon black, 3.2-5.2 parts of an anti-aging agent, 0.5-2 parts of a homogenizing agent, 45-55 parts of carbon black, 1-3 parts of a vulcanizing agent and 0.5-1.2 parts of a vulcanization accelerator. And 0.1 to 0.4 part of scorch retarder. The cold-resistant rubber composition disclosed by the invention has relatively high tensile strength, heat aging resistance and wear resistance, is high in toughness, small in brittleness and not easy to harden and crack at low temperature, and shows excellent low-temperature impact resistance.

The invention provides a capacitor with an auxiliary heat dissipation structure, and relates to the technical field of capacitors. The heat dissipation base body is arranged around the capacitor core body, the inner wall of the heat dissipation base body is attached to the outer wall of the capacitor core body, and the heat dissipation base body is used for absorbing heat generated by the capacitor core body; the primary heat dissipation layer is laid along the outer wall of the heat dissipation base body and used for absorbing heat on the heat dissipation base body; and the secondary heat dissipation layer is matched with the primary heat dissipation layer and is used for absorbing the heat on the primary heat dissipation layer and increasing the speed of transferring the heat on the primary heat dissipation layer to the external environment. By means of the design, the problems that an existing capacitor is prone to thermal aging, so that the service life of the capacitor is greatly shortened, and electronic equipment breaks down can be solved.

The invention discloses a polyamide material with an electromagnetic shielding function, and relates to the technical field of polymer composite materials. The invention discloses a polyamide material with an electromagnetic shielding function. The conductive composite material is prepared from the following raw materials in parts by weight: 40 to 60 parts of modified polyamide resin, 20 to 35 parts of modified conductive filler, 5 to 10 parts of maleic anhydride grafted polyamide, 0.5 to 2 parts of antioxidant, 1 to 3 parts of stearic acid, 3 to 8 parts of ethylene-vinyl acetate, 5 to 10 parts of triphenyl phosphate, 10 to 20 parts of aluminum nitride, 0.5 to 1 part of dodecyl dimethyl benzyl ammonium chloride and 1 to 3 parts of silane coupling agent KH-550 hydrolysate. And 30-60 parts of a 20% silane coupling agent KH-560 ethanol solution. The polyamide material has efficient electromagnetic shielding performance and excellent mechanical strength, high shielding effectiveness under low filler content is achieved through modification design, the melt index adapts to a low-pressure injection molding process, the damp-heat aging performance is stable, the problems of contradiction between shielding and processability, mechanical deterioration and the like of a traditional material are solved, and the polyamide material is suitable for electronic module packaging.

The invention belongs to the technical field of ceramic materials, and discloses a zirconia ceramic containing nanofiber alumina and stabilized by yttrium oxide, the zirconia ceramic contains 3 mol% of Y2O3, the concentration of nanofiber Al2O3 in the composite ceramic is 0.95 vol%-1.9 vol%, and the sintering temperature is 1400-1500 DEG C. The invention also discloses a preparation method of the zirconia ceramic. The low-temperature hydrothermal aging resistance of the yttria-stabilized zirconia ceramic can be greatly improved by adding a proper range of nano-fiber alumina; the addition of a proper range of nanofiber alumina has no significant influence on the rheological properties of the yttrium oxide-stabilized zirconia ceramic, and the void ratio of the pressed zirconia ceramic is not greatly different from that of the zirconia ceramic not added with the nanofiber alumina.

The invention belongs to the technical field of epoxy material aging evaluation methods, particularly relates to a joint evaluation characterization method for aging characteristics of an epoxy insulating material, and aims to solve the problems that in the prior art, a method for simultaneously carrying out comprehensive evaluation on aging of epoxy resin on thermal, electromagnetic and mechanical property changes is lacked, and most of existing methods adopt simple threshold comparison. And the accuracy and objectivity of an evaluation result are limited. The characterization method comprises the following steps: providing an epoxy insulating material sample; comprehensive aging treatment of electrical aging, thermal aging and mechanical aging is applied to the epoxy insulating material sample so as to obtain epoxy insulating material samples aged at different time lengths; respectively measuring a thermal performance parameter, an electromagnetic performance parameter and a mechanical performance parameter corresponding to each aging time length; and inputting the obtained performance parameters into the neural network model, and outputting the aging grade and the aging factor of the epoxy insulating material so as to complete the joint evaluation of the aging characteristics of the epoxy insulating material.

A TPE novel thermoplastic rubber flexible cable disclosed by the present invention comprises a tensile conductor, an insulation shielding sleeve and an outer sleeve, the outer sleeve is internally provided with a buffer filling layer and a tear-resistant belt, a high temperature resistant layer is arranged between the outer sleeve and the insulation shielding sleeve, and the high temperature resistant layer is composed of a polyimide nanofiber woven belt and an outer sleeve layer. The polyimide nanofiber woven belt and the outer sleeve layer successively sleeve the outer layer of the tensile conductor, so that instantaneous high temperature can be blocked, and the temperature resistance of the tensile conductor is enhanced. The hBN / TPE composite material is adopted, the temperature resistance limit is broken through, the cable can resist the temperature from 130 DEG C to 150 DEG C, the heat resistance limit of the cable is improved, and thermal aging is relieved; high tear resistance is achieved through dynamic crosslinking of SEBS / TPU, the tear strength is larger than or equal to 25 kN / m, and the mechanical performance is improved through cooperation of the tear-resistant layer of the bionic three-dimensional woven structure and the gradient buffer filling layer; and the bending life, the tensile strength and the temperature resistance of the cable are superior to those of a traditional TPE cable, and international standards such as IEC, UL and ISO are met.

The invention discloses an anti-counterfeiting flexible packaging film material and a preparation process thereof, belongs to the technical field of packaging material preparation, and aims to solve the technical problem that the anti-counterfeiting performance and the mechanical property of a packaging material in the prior art need to be further improved. Modified polyurethane, zinc-carboxylate cluster polyester and phosphorus-containing polysiloxane are synergistically compounded to construct a multi-scale structure with a flexible matrix, physical crosslinking and an inorganic skeleton, and the prepared anti-counterfeiting flexible package film has high strength and high ductility in mechanical properties and still keeps excellent stability after thermal aging; a phosphorus-silicon synergistic gas phase flame suppression and condensed phase vitrification barrier is formed in the aspect of flame retardance; the anti-counterfeiting packaging film has stable optical fingerprints under ultraviolet light in anti-counterfeiting performance and has reversible color change characteristics under the action of tensile stress, static and dynamic dual verification is realized, and the overall performance of the anti-counterfeiting packaging film is obviously superior to that of a conventional packaging film.

The invention discloses an energy-saving type three-dimensional roll iron core transformer, and relates to the field of transformers. The energy-saving type three-dimensional roll iron core transformer comprises a transformer sealing shell, a three-dimensional iron core and a coil winding, the three-dimensional iron core and the coil winding are arranged in the transformer sealing shell, a lower limiting frame is fixedly connected in the transformer sealing shell, an upper limiting frame is arranged on the lower limiting frame, and three sets of temperature sensors are fixedly connected to the lower limiting frame. And an insulating material is nested outside the coil winding. According to the energy-saving type three-dimensional roll iron core transformer, the phase change material is embedded in the insulating material on the periphery of the coil winding, the phase change material serves as a passive heat absorption material at the high temperature, meanwhile, the fluorinated liquid cooling machine, the circulating pump, the three-way shunt pipe and the fluorinated liquid flowing mechanism form a fluorinated liquid cooling circulation system, and local hot spots are prevented from being formed at the end of the insulating material; and thermal aging acceleration and even carbonization of the insulating material are avoided.

The invention relates to the field of insulation electrical strength evaluation, and particularly discloses a method for evaluating the oil paper insulation electrical strength of a converter transformer through alternating-current and direct-current voltage superposition. Comprising the following steps: step S01, collecting breakdown voltage data of an oil paper insulation sample; step S02, analyzing breakdown strength distribution of the oil paper insulation sample; step S03, analyzing breakdown characteristics of an unaged oil paper insulation sample; step S04, analyzing breakdown characteristics of a thermally aged oil paper insulation sample; s06, outputting a breakdown characteristic analysis result of the oil-paper insulation sample, and analyzing the influence of alternating-current and direct-current voltage superposition and thermal aging on the breakdown characteristic; according to the method, the breakdown performance of the oil paper insulating material under the alternating current / direct current superposed voltage and thermal aging conditions is deeply analyzed, the influence on the performance of the oil paper insulating material is obtained, and a theoretical basis is provided for optimization and reliability improvement of insulating materials in a high-voltage direct current system and a converter transformer.

The invention discloses a protection device for electrical installation, and relates to the technical field of electrical equipment installation auxiliary devices, the protection device comprises a protection shell, heat continuously generated by a cable joint is absorbed through a heat conduction seat, graded heat dissipation action is triggered through the thermal driving characteristic of a shape memory alloy spring, when the temperature rises, a rotating plate turns over to form a directional air guide channel, and the heat dissipation effect is improved. Under the high-temperature extreme working condition, the self-adaptive structure further focuses the airflow, the metal foam and the phase-change material cooperatively cool the airflow, deep heat dissipation is achieved, heat is prevented from being accumulated in the protective shell and around the connector, the whole heat dissipation process does not need external energy, driving is completely depended on heat generated by the cable, and the service life of the cable is prolonged. And meanwhile, the rainproof and dustproof effects are guaranteed through the graded sealing design, the thermal aging speed of insulating glue, a heat-shrinkable sleeve and other insulating materials at the joint is effectively delayed, the insulating protection effect is enhanced, and the safety risk caused by high temperature is reduced.

The utility model discloses a thermal aging destressing device for pipe fittings, which belongs to the technical field of thermal aging destressing for pipe fittings, and adopts the technical scheme that the thermal aging destressing device comprises a heating furnace and three furnace doors, the front side of the heating furnace is fixedly connected with a support frame, and the top of the support frame is provided with an adjusting mechanism and a fixing mechanism; the rear side of the heating furnace is fixedly communicated with a cooling frame; the adjusting mechanism comprises a first supporting plate, a first adjusting frame, two second supporting plates, six auxiliary pads, a second adjusting frame, six auxiliary columns and a third adjusting frame, and the problems that due to the fact that specifications of existing pipe fittings are different, temperature distribution in a heating furnace may be uneven during heating destressing, and if the cooling speed is too high, the temperature distribution is not uniform are solved. In the prior art, a large temperature gradient can be formed in the pipe fitting, then thermal stress is generated, and the newly generated stress may counteract residual stress eliminated by thermal aging treatment, and even causes the problems of deformation or cracking of the pipe fitting and the like.

The invention belongs to the technical field of aluminum plastic film performance detection, and particularly relates to an aluminum plastic film accelerated thermal aging detection method which comprises the following steps: S1, testing the initial stripping force performance of an aluminum plastic film test sample; s2, importing an acceleration factor calculation formula according to an ASTM standard; s3, calculating normal corresponding normal working time L1 according to the acceleration factor AF; l2 is the working time at high temperature; l3 is the working time under high temperature and high humidity; s4, accelerated aging temperature and humidity are designed, and acceleration factors AF and corresponding L2 and L3 in the placement environment and the normal working environment are calculated respectively; and S5, directly placing the aluminum-plastic film test sample in a high-temperature and high-humidity box and a high-temperature box soaked in a polytetrafluoroethylene bottle containing electrolyte respectively, testing the electrolysis-resistant stripping force performance of the aged inner layer according to L2, testing the stripping force performance of the aged outer layer according to L3, and determining that the aluminum-plastic film test sample is qualified when the stripping force for accelerated aging meets the set requirement.

The utility model discloses an aging-resistant conductive rubber tolerance strength testing device, which comprises a base and a plurality of testing mechanisms arranged on the base, the base is provided with the plurality of testing mechanisms, through the arrangement, a user can simultaneously carry out thermal aging tests on a plurality of rubber products in different temperature environments, the testing efficiency is effectively improved, and the testing cost is reduced. The testing mechanism is used for carrying out thermal aging testing on the rubber product; comprising a heat preservation shell fixed to the top end of a base, a support installed on the inner wall of the heat preservation shell, a rotating shaft rotationally installed on the support, placing frames fixed to the rotating shaft in an annular array mode, an electric heating wire fixed to the inner wall of the heat preservation shell and a high-speed fan fixed to the inner wall of the heat preservation shell. The connecting pipe is connected with the top and the bottom of an inner cavity of the heat preservation shell, the sealing door is installed on the heat preservation shell in a hinged mode, and the aging-resistant conductive rubber tolerance strength testing device has the advantages of being low in energy consumption and high in testing efficiency.

The utility model provides rotor casting production equipment, and relates to the field of motor rotor manufacturing equipment, and the rotor casting production equipment comprises a rotor casting mold, an assembly table, a preheating device, a casting device, a first cooling device, a disassembly table, a cutting device and a thermal aging device. Wherein except that the assembling table and the disassembling table need to manually assemble a mold and demold, mechanical production is realized in the processes of preheating, casting, cooling, cutting, aging elimination and the like, and the production operation is stable and efficient; besides, compared with a traditional standing aging elimination mode, the thermal aging device provided by the utility model is used for additionally heating and cooling the product through the second heating machine and the second refrigerating machine, so that the thermal aging elimination period is greatly shortened.

The invention discloses a variable-temperature aging strengthening low-cost Fe-based medium-entropy alloy and a preparation method thereof, and belongs to the technical field of alloys. The atomic expression of the medium-entropy alloy is FeaNibCrcAldTie, a = 46, 23 < = b < = 28, 18 < = c < = 23, 5 < = d < = 6, 2 < = e < = 3, and the medium-entropy alloy is obtained through vacuum induction melting, hot forging, room-temperature rolling and variable-temperature aging treatment in sequence. The method is characterized in that reasonable alloy components are designed, continuous variable-temperature aging is adopted to replace traditional isothermal aging, and an L12 phase which is high in density, uniform in distribution and moderate in size can be separated out. The L12 phase can effectively promote dislocation to bypass mechanism movement, the yield strength of the alloy is remarkably improved to 1.3 GPa or above, and meanwhile the uniform elongation rate exceeds 10%. The strength bottleneck of the low-cost medium-entropy alloy is broken through, and a high-performance and low-cost choice is provided for engineering application of the low-cost medium-entropy alloy in an extreme environment.

The utility model relates to a novel high-temperature-resistant power cable. The power cable comprises a plurality of insulated wire cores; each insulating wire core comprises a plurality of conductors, a first high-temperature-resistant wrapping tape, a semi-conductive conductor shielding layer, an insulating layer, a semi-conductive insulating shielding layer and a copper tape shielding layer. Flame-retardant fillers are arranged among the plurality of insulating wire cores; a double-layer high-temperature-resistant wrapping tape II is wrapped outside the plurality of insulating wire cores to form a cable core, an isolation sleeve is extruded outside the cable core, a galvanized steel tape armoring layer is wrapped outside the isolation sleeve, a high-temperature-resistant wrapping tape III is wrapped outside the galvanized steel tape armoring layer, and an outer sheath is extruded outside the high-temperature-resistant wrapping tape III. The cable has high temperature resistance, corrosion resistance, excellent light resistance, tensile strength, thermal aging resistance and the like, can normally and stably work at rated high temperature, has no influence on electric energy transmission performance, ensures that the cable has longer service life, and can be widely applied to high-temperature electric power transmission in the industries of steel, metallurgy, chemical engineering and the like.

The application particularly relates to a cast stainless steel multiaxial low-cycle fatigue prediction method, which comprises the following steps: measuring or calculating the axial strain amplitude and the corresponding axial stress, the shear strain amplitude and the corresponding shear stress, and the phase difference between the axial strain amplitude and the shear strain amplitude of a cast stainless steel concerned part; calculating the equivalent axial strain amplitude and the equivalent shear strain amplitude of the cast stainless steel concerned part after correction and containing the influence of thermal aging; and substituting the equivalent axial strain amplitude and the equivalent shear strain amplitude of the cast stainless steel concerned part after correction and containing the influence of thermal aging and the phase difference therebetween into a cast stainless steel multiaxial low-cycle fatigue prediction model containing the influence of thermal aging to calculate the multiaxial low-cycle fatigue life and the fatigue crack direction of the cast stainless steel after thermal aging. The cast stainless steel multiaxial low-cycle fatigue prediction method can accurately predict the fatigue life of the cast stainless steel under multiaxial low-cycle fatigue loading and the direction of fatigue crack initiation and initial propagation.

A busbar covered with a cladding layer and a cladding method thereof. The busbar comprises a metal conductor base and a composite insulating layer formed on the surface of the metal conductor base by a reactive co-extrusion process; the composite insulating layer comprises a polyethylene-based adhesive inner layer in direct contact with the metal conductor base; the raw materials for preparing the polyethylene-based adhesive inner layer comprise, by weight fraction, PA12 75%-85%, antioxidant 0.1%-1%, anti-UV additive 0.1%-2%, color powder 0.5%-5%, and special additive 5%-20%. Through the synergy of material end group design and reactive co-extrusion process, a stable chemical bonding network is constructed in situ at the interface while continuously producing rapidly, which greatly improves the interlayer bonding force, heat aging resistance and long-term reliability of the cladding layer, and is particularly suitable for high-voltage battery systems of new energy vehicles with extremely high requirements for insulation and durability.

The application relates to the technical field of cables and discloses an anti-cracking low-smoke halogen-free flame-retardant cable based on a double-layer functional gradient material, which comprises a cable core, a metal armor layer and an outer sheath located outside the metal armor layer. The outer sheath is a double-layer co-extrusion structure and comprises a first sheath layer and a second sheath layer; the first sheath layer is a low-smoke halogen-free flame-retardant polyolefin sheath material meeting the performance requirements of the code ST8 in IEC 60502-2:2024, the second sheath layer is a low-smoke halogen-free flame-retardant polyolefin sheath material meeting the performance requirements of the code ST12 in IEC 60502-2:2024, delta 1 is 0.3 mm-4.5 mm, delta 2 is 0.3 mm-4.5 mm, and delta 1+delta 2 is 0.6 mm-7.5 mm. The cable takes into account the flame-retardant continuity, anti-cracking performance and mechanical maintenance performance after thermal aging.

The invention discloses a method for evaluating the heat treatment effect of a PBX structural member based on a modal test. The method comprises the following steps: step 1, measuring the density value rho and the three-dimensional size V of the PBX structural member; 2, measuring the resonant frequency; 3, according to the resonant frequency, obtained in the step 2, of the PBX component and the density value and the three-dimensional size parameter, obtained in the step 1, of the PBX component, the overall Young modulus of the PBX component is obtained through inversion, and accurate measurement of the Young modulus of the PBX component is achieved; and 4, carrying out thermal aging of different temperatures and different times on the PBX structural member, measuring the Young modulus of the PBX structural member before and after thermal aging according to the methods in the steps 1-3, and evaluating the Young modulus of the PBX structural member before and after thermal aging. The method can be used for quantitatively and nondestructively evaluating the thermal aging effect of the PBX component, has the characteristics of high sensitivity, simple test method and no special requirement on the shape of the component, and can be widely applied to the evaluation of the thermal aging effect of pressed / cast explosives or other similar materials.

This disclosure relates to the field of industrial flue gas treatment technology. A sintering flue gas treatment device disclosed herein includes a base, a treatment box mounted on the top of the base, and connecting pipes one and two fixedly connected to the left and right sides of the bottom of the treatment box, respectively. A burner, heat exchange ceramic one, and heat exchange ceramic two are installed inside the treatment box; a switching valve is also installed on the top of the base. This device pumps the heat exchange liquid from the heat exchange box cavity into connecting pipe two via a pump and an inlet pipe. The liquid then flows back to the heat exchange box sequentially along the upper side of the sealing groove cavity, connecting pipe one, the lower side of the sealing groove cavity, connecting pipe three, return pipe, return cylinder, and return groove, forming a circulating flow of the heat exchange liquid. This design significantly reduces the temperature rise of the sealing gasket due to working heat by circulating heat exchange liquid inside the sealing gasket, effectively delaying the heat aging and failure of the sealing gasket.

The invention discloses a preparation method of high-performance cellulose insulation paper modified by nano-alumina. The preparation method comprises the following steps: preparing a nano-alumina dispersion liquid, preparing a nano-cellulose dispersion liquid, adding paper pulp fibers, the nano-alumina dispersion liquid and the nano-cellulose dispersion liquid into deionized water, and carrying out papermaking, the mass fraction of the nano cellulose in the modified cellulose edge paper is 1-12%. According to the preparation method provided by the invention, nano aluminum oxide and nano cellulose particles are adopted as modified materials, a large number of heat conduction channels are formed in a fiber structure of the insulation paper, the heat conduction performance of the insulation paper is improved, and the insulation paper can still keep stable performance and is not prone to thermal aging and deformation in a high-temperature environment; a large number of traps can be formed in the paper, migration of charged particles is hindered, conductive current is reduced, and the volume resistivity of the insulation paper is improved; the method is simple in steps and low in cost, and industrial production and practical application of the insulation paper are facilitated.

The application relates to the technical field of cables, and discloses a high-strength aluminum alloy medium-voltage power cable. The high-strength aluminum alloy medium-voltage power cable comprises, from inside to outside, an aluminum alloy conductor and an insulation layer; the insulation layer is a cross-linked polyethylene nano-composite insulation material, and the raw material components of the cross-linked polyethylene nano-composite insulation material comprise, in terms of weight fractions, 100 parts of a base resin, 3-8 parts of core-shell-star compounded inorganic nano-filler, 0.5-1 part of an antioxidant and 1.5-2.5 parts of a cross-linking agent; the core-shell-star compounded inorganic nano-filler is silica-coated nano-aluminum nitride grafted with polyhedral oligomeric silsesquioxane, and is denoted as AlN@SiO2-POSS. In the application, the inorganic nano-composite filler is used to improve the thermal conductivity of the cable insulation layer, and meanwhile, the dielectric strength, mechanical tensile property and heat aging resistance of the cable are improved.