105 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 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 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 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 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 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 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.

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.

The application discloses a high-temperature-resistant and porcelainizable silicon resin composite material and a preparation method thereof, and belongs to the technical field of organic polymer materials. The silicon resin composite material is modified by polydopamine modified boron carbide and two kinds of low-melting-point glass powder, and the gradient synergy of the polydopamine modified boron carbide and the two kinds of low-melting-point glass powder can make the silicon resin composite material generate phase transition from a silicon dioxide phase to a B2SiO5 phase and then to a Mg2SiO4 phase in a high-temperature thermal aging process, and the B2SiO5 phase and the Mg2SiO4 phase can form a B2SiO5-Mg2SiO4 ceramic network, which, in cooperation with SiC, endows the composite material with excellent high-temperature mechanical properties. The silicon resin composite material provided by the application can generate phase transition at high temperature, the mechanical properties are significantly improved, good processing performance and mechanical strength are maintained, and the silicon resin composite material is suitable for high-performance structural parts and other composite material products in the field of aerospace.

The invention relates to the technical field of automatic laying of composite materials, in particular to a laser-assisted in-situ forming process and device protected by high-temperature inert gas, and the process comprises the following steps: supplying a prepreg tape to a laying point; the laying points are heated through laser; an inert gas protection cover is arranged on the periphery of the laying point, heated inert gas is supplied, a local inert atmosphere is formed, and meanwhile the inert gas forms composite heating through convective heat transfer and laser radiation; and under the covering of the protective cover, the in-situ consolidation is realized through the compaction of the compaction roller. The device comprises a laying head module, a laser heating unit, an inert gas protection cover and an inert gas supply unit. A stable high-temperature inert protection environment is formed in a laser heating and compacting area, the oxidation and thermal aging risks of a thermoplastic matrix are reduced, the heating efficiency is improved, the laying speed is increased, control over a temperature field is achieved through partitioned gas supply, and therefore the forming quality and process stability of a composite material component are improved.

The invention relates to the technical field of abrasive tool abrasive cloth manufacturing, in particular to grinding abrasive cloth containing an innovative base material coating and a preparation method of the grinding abrasive cloth. Alkali-free glass fiber fabric serves as a base material, a three-dimensional through heat conduction network formed by nanometer boron nitride and aluminum oxide sol is constructed, a gradient cross-linking type primer layer and a functional glue coating layer are coated, and the grinding abrasive cloth containing the innovative base material coating is obtained. And carrying out stepped heating curing and plasma surface activation treatment. The problems of adhesive layer thermal aging, base cloth burning loss and abrasive dust blocking in the grinding process can be effectively solved, the heat dissipation performance, the abrasive bonding strength and the chip removal efficiency are remarkably improved, and the abrasive material is suitable for the high-load long-time grinding working condition.

The application discloses a rare earth high-weatherability PPR pipe and a production method thereof, and comprises the following steps: raw material pretreatment, premix preparation, extrusion molding, inner and outer spray cooling and shaping, cutting and spraying. The rare earth high-weatherability PPR pipe improves performance through the synergistic effect of a rare earth composite stabilizer, titanium white and carbon black. The rare earth composite stabilizer captures free radicals, and forms a triple protection system with the titanium white and the carbon black, thereby significantly enhancing weatherability. The titanium white reduces interface defects through coating and forms complementation with the carbon black. The rare earth cooperates with the titanium white to prolong oxidation induction time and thermal aging life. The carbon black also improves antistatic property. The cooperation of the additives optimizes dispersion, ensures that the pipe tensile strength and elongation at break reach standards, and takes into account weatherability and mechanical property.

The application discloses an oil-paper insulation life evaluation method and device, which can place the to-be-evaluated oil-paper into first insulation oil, heat the first insulation oil to a preset accelerated thermal aging temperature, and keep the temperature for a predefined duration to perform accelerated thermal aging treatment on the to-be-evaluated oil-paper; obtain the sample after the accelerated thermal aging treatment, and place the sample into second insulation oil; heat the second insulation oil to a preset withstand voltage test temperature; perform a withstand voltage test on the sample after the accelerated thermal aging treatment in the heated second insulation oil according to a preset initial voltage, voltage duration and voltage increasing gradient; when the sample after the accelerated thermal aging treatment is broken down during the withstand voltage test, determine the withstand voltage duration of the sample after the accelerated thermal aging treatment; and evaluate the insulation life of the to-be-evaluated oil-paper based on the withstand voltage duration of the sample after the accelerated thermal aging treatment. The application can effectively evaluate the insulation life of the oil-paper, thereby determining the reliability of the insulation performance of the oil-paper.

The invention relates to a wave absorbing-heat preventing and insulating composite material based on an impedance gradient structure and a preparation method and application of the wave absorbing-heat preventing and insulating composite material and relates to the technical field of electromagnetic wave absorbing materials.The composite material comprises a fiber reinforcement and a resin matrix, and the fiber reinforcement is sequentially provided with a heat insulating area and a wave absorbing area in the incident direction of electromagnetic waves; and the wave-absorbing area comprises a hybrid fiber layer formed by hybrid weaving of conductive fibers and wave-transparent fibers. By constructing an impedance gradient structure and preferably selecting the nanopore organic silicon resin as a matrix, the technical problems that an existing wave-absorbing material is narrow in absorption band, single in function and poor in high-temperature environment adaptability as well as complex in process, insufficient in long-acting stability and the like caused by dependence on an additional wave-absorbing agent are solved. The composite material realizes integration of multiple functions of wave absorption, heat prevention and heat insulation, has a broadband efficient wave absorption characteristic in a frequency band of 2-18GHz, can still keep excellent wave absorption performance after high-temperature ablation and thermo-oxidative aging, and is wide in application scene.

The production method comprises the following steps of raw material pretreatment, premix preparation, extrusion molding, internal and external spraying, cooling and shaping, cutting and spraying, the performance of the rare earth high-weather-resistance PPR pipe is improved through the synergistic effect of a rare earth compound stabilizer, titanium dioxide and carbon black, the rare earth compound stabilizer captures free radicals, and the rare earth compound stabilizer captures the free radicals; titanium dioxide is coated to reduce interface defects, titanium dioxide and carbon black form complementation, rare earth and titanium dioxide cooperate to prolong oxidation induction time and thermal aging life, carbon black also improves antistatic property, and auxiliary agents are matched to optimize dispersion, so that tensile strength and elongation at break of the pipe reach the standard. The weather resistance and the mechanical property are considered.

The invention relates to a potassium salt mine hydraulic support and a production process method thereof, and the production method comprises the following steps: S1, cutting and blanking steel, and carrying out groove processing to obtain a base body structural part and structural accessories; s2, the base body structural part is assembled and welded to obtain a structural prototype; s3, the structure accessories are installed in sequence, and a semi-finished product is obtained; and S4, the semi-finished product is subjected to thermal aging treatment, overall machining and surface anti-corrosion treatment, and a structural part is obtained and further assembled to form the hydraulic support. And in the steps S2-S3, after welding is completed, laser micro-textured surface treatment and surface passivation treatment are conducted on a weld joint area, and then a formed micro-textured structure is filled with corrosion inhibition coating. The technical problems that in an existing production technology, structural internal stress and deformation control of a hydraulic support are insufficient, and weak areas such as welding seams are prone to early corrosion, so that the bearing capacity of the hydraulic support is reduced rapidly in high-chlorine, high-humidity and high-ground-pressure environments such as sylvite ores, and the overall service life is short can be solved.

This invention relates to the field of chlorinated polyvinyl chloride (PVC) technology, specifically to a high Vicat softening temperature, high-temperature resistant CPVC pipe and its preparation method. The pipe is obtained by extrusion and heat treatment of a composition containing a specific core-shell type heat-resistant and impact-resistant modifier. The modifier has a multi-layered shell structure with cross-linked polybutyl acrylate as the core and containing gradient-distributed epoxy functional groups. The preparation method includes a stepwise mixing of raw materials and an extrusion process that controls the short residence time of the melt. This invention significantly improves the Vicat softening temperature of the pipe while also achieving excellent impact resistance, internal pressure thermal stability, and long-term thermal aging performance.

The application provides a kind of flame-retardant weatherable foamed polypropylene composite material and its preparation method.The foamed polypropylene composite material contains the following components by weight: polypropylene 50-90 parts, polyethylene 10-50 parts, flame retardant 5-20 parts, synergist 1-10 parts, foaming agent 2-15 parts, irradiation sensitizer 0.5-3 parts, antioxidant 0.5-2 parts.The polypropylene composite material prepared by the application has a higher flame retardant grade and oxygen index, can effectively prevent the spread of fire, significantly reduces the risk of fire, and the halogen-free system is more environmentally friendly;The tensile strength is high and the tensile strength retention rate after thermal aging and ultraviolet aging is high, indicating that the mechanical properties are good, the structural bearing capacity is strong, and the weather resistance is good, so that the material has excellent long-term service life and environmental stability, and has wide application prospect.

The invention discloses a high-temperature-resistant organosilicon insulating material based on a novel high-temperature-resistant filler, the high-temperature-resistant organosilicon insulating material is composed of an organosilicon matrix, a novel high-temperature-resistant multi-component composite filler and a surface modifier, and the preparation method comprises the following steps: S1, intrinsic enhancement preparation of the organosilicon matrix; s2, interface regulation and control modification of the novel high-temperature-resistant filler; s3, optimizing and compounding the multi-element filler; s4, preparing and curing a composite material; and S5, performance verification and regulation are carried out. Compared with the prior art, the material has the advantages that the 5% thermal weight loss temperature in a nitrogen atmosphere is larger than or equal to 400 DEG C, the expected life at 250 DEG C is larger than or equal to 5000 hours, the loss rate after 1000 hours of thermal aging in air at 300 DEG C is smaller than or equal to 10%, meanwhile, the tensile strength is larger than or equal to 10 MPa, and the material can be stably applied to a high-temperature electrical insulation scene.