105 results about "Thermal ageing" patented technology

The invention discloses a photo-thermal aging resistant polyester composite material and a preparation method thereof, a modified monomer, a modified filler, benzophenone, terephthalic acid and neopentyl glycol are subjected to esterification condensation polymerization to prepare the composite material, and the modified monomer is added, so that the prepared polyester molecule is of a branched structure; the side chain of a polyester molecule and the surface of the modified filler both contain unsaturated double bonds which can react after being irradiated by ultraviolet light, so that the number of crosslinking points of the composite material is increased, the crosslinking density is further improved, and the anti-aging effect of the material is further improved; the modified filler can improve the high-temperature-resistant effect of the composite material, the modified filler is matched with the hindered phenol structure of the side chain to further improve the heat aging-resistant effect of the composite material, hydroxyl and ketone groups on the modified filler form intramolecular hydrogen bonds, light energy can be converted into heat energy to be released, and then the light aging-resistant effect of the composite material is improved.

The invention relates to the technical field of current collectors, in particular to a flame-retardant composite current collector and a preparation method thereof.The flame-retardant composite current collector is composed of a base film layer, metal film layers deposited on the two faces of the base film layer and flame-retardant layers formed by curing flame-retardant coatings and coated on the surfaces of the metal film layers; the preparation method comprises the following steps: S1, mixing the modified polypropylene resin, the reinforcing component, the antioxidant, the lubricant, the coupling agent and the compatilizer to obtain a mixture; s2, carrying out melt extrusion and tape casting on the mixture, and stretching through a two-way stretching process to form a base film layer; s3, metal film layers are deposited on the two faces of the base film layer, and hot press molding is conducted; s4, coating a flame-retardant coating, drying and curing to obtain the flame-retardant composite current collector, the prepared flame-retardant composite current collector has excellent flame retardance, excellent mechanical property and thermal aging resistance and high peel strength, the binding force of the metal film layer and the base film layer is firm, and the quality and safety of the composite current collector are effectively improved.

The invention relates to the technical field of wafer test equipment, in particular to a heating aging test tool which comprises a storage rack and further comprises a wafer clamp placed on the storage rack. The detection assembly comprises a plurality of elastic probes located on one side of the storage rack and a heating disc; and the hot air guide assembly comprises a ventilation male head arranged on one side of the heating disc, an air guide pipe is arranged on the side, away from the ventilation male head, of the heat conduction cover, the air amount in the cavity is gradually decreased from near to far away from the air guide pipe, and the air flow speed is gradually decreased. A hot air flow guide assembly is arranged on a conveying frame, heat of a heating disc is guided to the position above a wafer through airflow through a heat conduction cover, the space above the wafer is divided into a plurality of cavities, the space size and the space shape of each cavity are set, the air flow speed and the contained hot air amount of each space are adjusted, and therefore the heat conduction efficiency of the wafer is improved. The influence of heat loss in the air flow process is reduced, so that the heating effects of all parts of the wafer are similar, and the detection effect is improved.

The invention relates to the technical field of digital twinning, in particular to a digital twinning-based heat dissipation system full-life-cycle predictive maintenance platform, which comprises a data acquisition module; a model construction module; the block division module is used for determining direct partitioning based on the regional coupling strength or related partitioning based on the heat exchange correlation degree according to the fault transfer coefficient; the category analysis module is used for determining a block category based on the temperature deviation degree and determining whether to adjust the block category of the second-class block based on the maximum fluctuation period attenuation rate according to the pollutant deposition influence degree and the thermal aging accumulation rate of the second-class block; the updating analysis module is used for determining the updating frequency of each updating block based on the comprehensive evaluation value; and the updating optimization module is used for determining whether to carry out optimization adjustment or not according to the block change coefficient. The model updating efficiency can be improved.

The present invention belongs to the technical field of polymer modified materials, and specifically relates to an aging-resistant, flame-retardant polypropylene composite material, and a preparation method and application thereof. The aging-resistant, flame-retardant polypropylene composite material of the present invention comprises the following raw materials in parts by weight: 20 to 60 parts of polypropylene resin; 1 to 10 parts of compatibilizer; 5 to 25 parts of EPDM rubber recycled material; 5 to 30 parts of smoke suppression flame retardant; 0.1 to 2 parts of light stabilizer; 0.1 to 2 parts of antioxidant; 10 to 40 parts of glass fiber. The aging-resistant, flame-retardant polypropylene composite material of the present invention has excellent mechanical properties, as well as light and heat aging resistance; tensile strength>85MPa, bending modulus>6000MPa, cantilever beam notched impact strength>165J / m, and strength is higher than that of wood. The injection-molded building formwork will not break when it falls vertically from a height of 3m, and can reach the B2 level of combustion performance of building materials and their products.

The invention relates to the technical field of high polymer materials, and discloses a high-strength anti-aging PE film, and a preparation method and application thereof. The preparation method of the high-strength anti-aging PE film comprises the following steps: modifying POSS-SH to obtain modified POSS; and combining the product obtained by the reaction of the 3, 5-di-tert-butyl-2-hydroxybenzaldehyde and the p-phenylenediamine with the modified POSS to obtain the high-performance antioxidant. 3, 5-diaminobenzoic acid is grafted on the surface modified calcium sulfate whiskers, and then nano calcium fluoride is deposited to obtain an inorganic composite material; treating the inorganic composite material to obtain an amphiphilic modified inorganic composite material; and mixing the amphiphilic modified inorganic composite material, a high-performance antioxidant and modified polyethylene, carrying out melt blending, and carrying out film blowing to obtain the high-strength anti-aging PE film. The high-strength aging-resistant PE film has good mechanical properties, thermal aging resistance, transparency and skid resistance, and can be used as an inner film material of an ultraviolet-cured hose material.

The invention relates to a cable accessory-based insulation silicone rubber thermal aging state detection method, apparatus and device. The method comprises the steps of obtaining a correlation model and a to-be-detected sample; transmitting ultrasonic waves to the to-be-detected sample for aging test to obtain a primary echo time domain signal; processing the primary echo time domain signal to obtain a spectrogram, and extracting a fundamental wave amplitude and a second harmonic amplitude from the spectrogram; calculating a relative nonlinear coefficient according to the fundamental wave amplitude and the second harmonic amplitude; and inputting the relative nonlinear coefficient into the correlation model for analysis to obtain the thermal aging degree. The method comprises the following steps: transmitting and receiving ultrasonic waves to and from a sample to be detected to obtain a primary echo time-domain signal, processing the primary echo time-domain signal to obtain a relative nonlinear coefficient, and inputting the relative nonlinear coefficient into a correlation model to analyze and evaluate the thermal aging degree of the identified thermal aging state of the sample to be detected. The microstructure change of the to-be-detected sample caused by thermal aging can be accurately captured, and the thermal aging state can be accurately evaluated.

The invention relates to the technical field of material performance detection, in particular to a rapid testing method for thermal aging failure of an oil and gas pipeline anticorrosive coating material, which comprises the following steps: testing oxidation induction time t of a sample; respectively carrying out thermal aging with different time lengths at 150 DEG C, measuring and calculating A (tri) / A (on) and a melt index change rate, establishing a linear equation of the A (tri) / A (on), and calculating A '(tri) / A' (on) corresponding to 35% of the melt index change rate; carrying out thermo-oxidative aging on the sample at different time lengths, measuring and calculating A (tri) / A (on), and obtaining aging time t'according to A '(tri) / A' (on); carrying out oxidation induction time test on the thermally aged material to obtain a rate coefficient k; and calculating the aging time corresponding to the material failure critical point. The test method provided by the invention can rapidly characterize the thermal aging failure critical point of the anticorrosive coating material, and provides a scientific basis for development of the material.

The invention discloses an oil paper insulation thermal aging state diagnosis mode construction method under high-frequency pulse voltage. The method comprises the following steps: firstly, building a partial discharge experiment platform under high-frequency pulse, acquiring a rising edge / falling edge partial discharge signal based on an established sliding phase window model, denoising, and obtaining a phase window normalized partial discharge graph according to the denoised discharge signal; then, extracting phase jump, phase concentration ratio and other pass frequency aging characteristic quantities from the phase window normalized partial discharge spectrum; then, constructing a correlation degree matrix between the pass frequency aging characteristic quantity and the frequency, obtaining a principal component which is in weak correlation with the frequency, and completing dimension reduction; and finally, identifying different stages of thermal aging under the high-frequency pulse based on a support vector machine algorithm optimized by a particle swarm algorithm. According to the method for identifying the oil paper insulation thermal aging stage under the high-frequency pulse voltage, the identification efficiency of the high-frequency aging stage of the transformer can be improved, and the accuracy of evaluating the insulation aging state of the high-frequency transformer is further improved.

A thermal aging test box for cable detection relates to the technical field of cable detection, is used for performing a thermal aging test on a cable, and comprises a box body, an ultraviolet lamp and an electric heating device, an opening and closing door is arranged on one side of the box body; electric heating devices are arranged on four side walls in the box body; a cylindrical ultraviolet lamp is arranged at the center position in the box body, and a rotating device for driving a cable to rotate in the circumferential direction of the ultraviolet lamp and autorotate is arranged above the ultraviolet lamp in the box body; a motor for driving the rotating device is arranged at the top of the box body; the cable is correspondingly connected with the rotating device through the clamping device; the electric heating devices are arranged on the four side walls in the box body, and it is ensured that the cable can be evenly heated in all directions. The cylindrical ultraviolet lamp arranged at the central position and the circumferential rotation and autorotation mechanism driven by the rotating device ensure that all parts of the surface of the cable can receive the same ultraviolet irradiation, so that a more uniform aging simulation environment is realized.

The invention relates to the technical field of adhesive stickers, in particular to a production process of an environment-friendly PP synthetic paper transparent PET bottom adhesive sticker composite material. The non-setting adhesive composite material produced by the invention overcomes the problem that the non-setting adhesive is poor in thermal aging resistance and ultraviolet aging resistance. Adding tetrapod-shaped zinc oxide whiskers treated by chenodeoxycholic acid and polyarylsulfone treated by carboxymethyl cellulose to obtain PP synthetic paper; the adhesive layer is obtained by reacting polyurethane, acrylate and the flexible group; the adhesive sticker composite material is obtained by blade-coating the prepared adhesion promoter on the single surface of the PP synthetic paper, then compounding the PP synthetic paper with the isolating layer and the adhesive layer, and finally performing hot-pressing compounding on the PP synthetic paper and the etched transparent PET bottom. After being subjected to thermal aging and ultraviolet aging, the adhesive sticker composite material is good in stripping performance and high in adhesive property.

The invention relates to a simulation test device and test method for oil extraction pipelines of an oil-immersed transformer, and the device comprises a thermal aging cavity, a copper electrode pair, insulation paper, an oil inlet, an oil outlet, a vacuum oil injection port, an intelligent temperature control system, a first oil extraction pipeline, a second oil extraction pipeline, a third oil extraction pipeline, an elbow, a speed-adjustable oil pump, and a three-way joint. The copper electrode pair and the insulation paper are both located in the thermal aging cavity, the insulation paper is arranged in the middle of the copper electrode pair, the oil inlet, the oil outlet and the vacuum oil injection port are all arranged outside the thermal aging cavity, the vacuum oil injection port is used for injecting insulating oil in a vacuum mode, and the intelligent temperature control system is connected with the thermal aging cavity. The oil outlet is sequentially connected with the first oil taking pipeline, the speed-adjustable oil pump, the second oil taking pipeline, the elbows, the three-way connector and the third oil taking pipeline, the third oil taking pipeline is connected with the oil outlet, circulation of insulating oil is achieved, and the number of the elbows can be changed. Compared with the prior art, the device has the advantages of being capable of simulating parameters such as the oil taking pipeline structure, the oil flow speed and the temperature of the oil-immersed transformer and analyzing the influence on the concentration of the gas dissolved in the oil and the like.

The invention relates to an electric-thermal combined aging simulation system and an aging simulation method of oiled paper. The system comprises an aging oven, a sealing oil groove arranged in the aging oven, and an electrode module and a temperature control module which are arranged in the sealing oil groove, the sealed oil groove is filled with insulating oil, the electrode module comprises an upper electrode and a lower electrode parallel to the upper electrode, and an oil paper sample is placed between the upper electrode and the lower electrode; the electrode module is used for applying an electric field to the surface of the oiled paper sample to simulate the electrical aging process of the oiled paper sample; and the temperature control module is used for adjusting the temperature of the insulating oil in the sealed oil groove in the process of simulating the electrical aging of the oiled paper sample so as to simulate the process of the combined action of thermal aging and electrical aging of the oiled paper sample. By adopting the method, accurate control of electric-thermal aging can be realized.

The invention belongs to the technical field of epoxy resin and impregnated paper sample wafer aging defect diagnosis, and discloses an epoxy resin and impregnated paper sample wafer aging defect diagnosis and service life prediction system. Comprising a thermal aging treatment module, a dielectric property test module, a main control module, a mass loss calculation module, an aging degree analysis module, a physicochemical property detection module and a life prediction module. According to the invention, a thermal aging test platform for the epoxy resin sample wafer and the epoxy impregnated paper sample wafer is established, the research on the aging degree rule of the sample wafer is completed from multiple angles of dielectric properties, Fourier infrared spectroscopy, mass loss rate and scanning electron microscope, and the research on the aging degree rule of the epoxy resin sample wafer and the epoxy impregnated paper sample wafer along with the deepening of the aging degree is elaborated. The changes of the surface appearance and the micromolecular structure of the dry-type bushing are explained in combination with the dielectric property, and a theoretical basis is provided for subsequent dry-type bushing aging degree judgment.

The application discloses a kind of thermoset elastomer thermal aging state evaluation method, comprising the following steps: S1, elastomer is treated with heat aging;S2, the maximum elongation of aging sample and positron annihilation lifetime spectrum are tested, and the free volume of aging sample is obtained by analyzing positron annihilation lifetime spectrum;S3, least square method is used to linearly fit the maximum elongation of aging sample and free volume, and the fitting equation of maximum elongation and free volume of elastomer in the process of thermal aging treatment is established;S4, in the actual thermal aging test of the same kind of elastomer, the fitting equation is used, and the maximum elongation of elastomer is calculated by determining the free volume of elastomer, and the thermal aging state of elastomer is evaluated.The application establishes the correlation between the maximum elongation of elastomer and free volume, realizes the thermal aging state of elastomer by free volume, realizes in-situ detection of thermal aging performance, and has high accuracy.

The invention discloses an oil paper insulation life evaluation method, device and equipment of a converter transformer and a medium, and relates to the technical field of electric power engineering, and the method comprises the steps: building an insulation life improvement model based on a linear cumulative damage theory and a thermal aging model; carrying out numerical solution on the electromagnetic field and the solid force field to obtain Lorentz force density and mechanical damage accumulation equivalent stress distribution, and determining an equivalent stress translation factor by utilizing the mechanical damage accumulation equivalent stress distribution; solving numerical values of the oil paper insulation space temperature field and the electromagnetic field to obtain total eddy current loss, and determining a temperature translation factor based on the Lorentz force density, the total eddy current loss and the oil paper insulation space temperature field; calculating total acceleration factor distribution by using the equivalent stress translation factor and the temperature translation factor, inputting the total acceleration factor distribution into the insulation life improvement model, and outputting space life distribution; and carrying out oil paper insulation life evaluation on the converter transformer, realizing quantitative evaluation on insulation fatigue damage under the action of cyclic load, and comprehensively evaluating the life of an insulation material.

This invention discloses a flame-retardant and anti-aging cable composite material and its preparation method, belonging to the field of cable material preparation technology. In this invention, a flame-retardant, high-temperature resistant polysiloxane containing double bonds, an anti-aging agent, and a flame-retardant filler are prepared and blended with raw materials such as EVA and low-density polyethylene. Irradiation causes cross-linking between the materials, endowing the composite material with heat resistance, aging resistance, and good mechanical properties. The anti-aging agent of this invention includes siloxane groups and benzophenone groups, possessing good resistance to both UV aging and heat aging, which is beneficial for further improving the anti-aging performance of the prepared cable composite material. The flame-retardant filler of this invention has urethane bonds grafted onto its surface, which matches the polarity of the EVA vinyl acetate segments, improving the compatibility between the flame-retardant filler and EVA, and further enhancing the flame retardancy of the prepared composite cable material.

The utility model discloses a novel motor casing relates to motor technical field, including the mounting hole on the base of casing body and its bottom, and the mounting hole wall is circumferentially provided with one or more outward extending heat conduction groove, and this heat conduction groove penetrates casing body outer surface and is communicated with the inside of mounting hole. The structure constructs the heat dissipation channel that reaches the outside of casing through the mounting hole area, and the heat blocking problem that the small bolt head contact area, air insulation of traditional motor casing causes is solved. When the bolt and the inner wall of mounting hole contact, heat can diffuse to the external environment along the heat conduction groove, and the local temperature rise of base mounting hole area is reduced, and then material thermal aging and bolt pre -tightening force attenuation are avoided.

The invention provides a photo-thermal aging resistant stone plastic floor wear-resistant layer and a preparation method thereof, and relates to the technical field of wear-resistant materials. The wear-resistant layer of the photo-thermal aging resistant fossil-plastic floor comprises the following materials in parts by weight: 120-160 parts of PVC resin powder, 25-35 parts of an ethylene-vinyl acetate copolymer, 35-50 parts of a plasticizer, 8-10 parts of modified nano titanium dioxide, 3-5 parts of a compound stabilizer, 1-1.5 parts of an ultraviolet light absorber and 0.5-1 part of an antioxidant. Wherein the compound stabilizer is a molecular sieve loaded organic tin-calcium zinc compound stabilizer. The invention aims to provide the novel photo-thermal aging-resistant fossil plastic floor wear-resistant layer aiming at the defects in the prior art, and the photo-thermal aging resistance of the floor wear-resistant layer under the long-term photo-thermal action is improved.

According to the ceramic material, the preparation method and the application, the ceramic material is composed of aluminum oxide, Y2O3 stabilized zirconium oxide with the mole percentage being 3% and (SrxBa1-x) (Al12-yCoy / 3Cry / 2Mny / 6) O19 tabular crystals, by introducing Ba, Sr, Cr, Co and Mn elements, the ceramic material meeting the performance requirement of surgical implants is prepared, according to YY / T 1294.2-2015 (ISO 6474-2-2019) standard tests, the performance of the ceramic material is excellent, the low-temperature hydrothermal aging phenomenon can be avoided, and the service life of the ceramic material is prolonged. The performance requirements of the surgical implant ceramic material can be met.

The utility model discloses a device for monitoring the alternating thermal aging effect of an atmosphere on a stator bar, and relates to the field of monitoring the insulating capacity of a generator stator bar. The simulation box is a sealed box body; the stator bar is installed in the simulation box. The atmosphere control module is used for controlling the oxygen concentration in the simulation box; the temperature control module is used for controlling the environment temperature in the simulation box; the macroscopic deformation monitoring module is used for acquiring macroscopic deformation of the stator bar; the internal stress monitoring module is used for acquiring internal stress of the stator bar; and the master controller is connected with each module. The generator stator bar insulation alternating thermal aging monitoring device can solve the problem that in the prior art, the full periodicity of a generator stator bar operating under the oxygen concentration condition of a high altitude environment cannot be effectively monitored under the insulation alternating thermal aging effect.

This application provides a method for thermogravimetric analysis (TGA) of resin-based composite materials for aero-engine components, belonging to the field of composite material testing technology. The method includes: extracting the operating state points of the aero-engine components; simplifying the operating state points; determining statistical results of the component's operating temperature and operating time for the thermogravimetric analysis based on the simplified operating state points; conducting a preliminary thermogravimetric analysis based on the statistical results of the component's operating temperature and operating time; using the preliminary thermogravimetric analysis results as a benchmark, determining the thermogravimetric trend and the direction for conducting thermogravimetric analysis using a temperature gradient; determining the temperature threshold for thermogravimetric analysis based on the temperature gradient thermogravimetric analysis results; calculating the cumulative thermogravimetric rate of the composite material used in the aero-engine components over the entire engine lifespan by calculating the thermogravimetric rate at each operating temperature above the cumulative temperature threshold; and accelerating the thermal aging of a new test piece to the cumulative thermogravimetric rate to obtain performance loss results.

The invention belongs to the technical field of safety evaluation of service materials, and particularly relates to a microscopic rapid evaluation method for a long-time thermal service state of a nuclear power pressure vessel material, which comprises the following steps of: 1, selecting a pressure vessel micro-area material in a certain service state; 2, a specific corrosive liquid is selected for corrosion for a certain time, and a state monitoring sample piece is obtained; step 3, the microscopic morphology of the state monitoring sample piece is shot through a microscope; 4, counting the percentage composition of the corrosion area; and 5, evaluating the thermal service state of the material according to the linear relationship between the percentage composition of the corrosion area and the thermal aging time. According to the microscopic rapid evaluation method for the long-time thermal service state of the nuclear power pressure vessel material, thermal aging degradation damage of the pressure vessel material is presented through an over-corrosion method, rapid evaluation of the thermal aging state can be achieved only by obtaining a local monitoring material, and the microscopic rapid evaluation method still has a good prediction effect on long-time thermal service equipment.

The invention relates to a polypropylene composite material as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials. The polypropylene composite material disclosed by the invention is prepared from the following components in parts by weight: 22 to 84 parts of polypropylene resin, 4 to 11 parts of elastomer, 9 to 21 parts of talcum powder, 0.15 to 2.5 parts of thermal aging aid and 0.18 to 1.2 parts of light aging aid, the thermal aging auxiliary agent comprises an antioxidant, a neutralizer and porous silicon dioxide A; the mass ratio of the antioxidant to the neutralizer to the porous silicon dioxide A is (0.5-5): (0.5-3): 1; the light aging auxiliary agent comprises a light stabilizer and porous silicon dioxide B; the mass ratio of the light stabilizer to the porous silicon dioxide B is (0.5-3): 1. The polypropylene composite material with excellent heat aging resistance and light aging resistance is obtained by compounding polypropylene and a specific auxiliary agent.

This invention discloses a method for dynamic modeling of the temperature field and prediction of overheating risk in cable connectors, relating to the field of electrical equipment condition monitoring and thermal management technology. The method includes constructing the connector's geometric domain and establishing a fully coupled electro-magnetic-thermal-mechanical initial value model containing Lorentz force correction terms and eddy current loss heat source terms; jointly assembling the Lorentz force and eddy current loss terms to form a magneto-thermal coupling correction matrix, calculating the equivalent heat source field of a strong magnetic field; solving the temperature field and updating the conductivity and permeability distributions in reverse, forming a bidirectional coupled iterative loop until a converged temperature field is output; extracting hot spot trajectories and temperature gradient vector fields based on the converged temperature field, inputting them into the thermal aging kinetic model of the insulation material to generate a multidimensional indicator surface for overheating risk, determining the risk level and outputting a warning signal. This invention improves the accuracy of connector temperature field prediction and the reliability of overheating risk warning under strong magnetic field environments through bidirectional coupled iterative correction and fully coupled modeling.

The invention belongs to the technical field of high polymer material modification, and discloses a heat-aging-resistant high-performance PVDF pipe fitting material and a preparation method thereof.The material is composed of a PVDF matrix, a two-dimensional nanosheet layer subjected to surface compatibility treatment, a light cross-linking system, a compatilizer, an antioxidant and a processing aid; the preparation method comprises the following steps: carrying out surface compatibility treatment on a two-dimensional nanosheet layer; carrying out melt blending granulation on a part of the PVDF matrix, the two-dimensional nanosheet layer and a compatilizer to prepare nanosheet master batches; carrying out melt blending on the residual PVDF matrix, the master batch, the antioxidant and the processing aid, adding the light crosslinking system in the later stage, and carrying out vacuum devolatilization; after filtering, extruding and granulating to obtain the PVDF pipe fitting material. The material is suitable for PVDF (Polyvinylidene Fluoride) pipes and pipe fittings for conveying high-temperature corrosive media.

The invention discloses a composite material capable of improving the thermal conductivity of LDPE and a preparation method of the composite material. The composite material is prepared from MOFS particles, NiS2 particles and LDPE. The preparation work of the composite material is carried out by adopting a melt blending principle and utilizing a rheometer, and the whole preparation process is simple in principle, easy to understand and convenient to operate. An infrared spectrum characterization characteristic test is carried out on the prepared nano composite material, it is found that after LDPE is doped with MOFs particles, NiS2 particles and MOFs / NiS2 composite particles with different concentrations, the molecular chain structure of the whole composite material is not changed, it is found through a heat conduction performance test that the heat conduction performance of the NiS2 / MOFs / LDPE composite material is better than that of pure LDPE on the basis that the dielectric performance of the NiS2 / MOFs / LDPE composite material is not affected, and the heat conduction performance of the NiS2 / MOFs / LDPE composite material is better than that of the pure LDPE. The thermal aging rate of the insulating material is slower, the service life is longer, and the loss of LDPE can be reduced to a certain extent.

The present application relates to a kind of high flexibility hydrogen gas barrier resistant bio-based polyamide composition and its preparation method, the composition of the present application is by the synergistic matching of bio-based raw materials and specific components, different from the raw materials and process route of prior art.The composition has high flexibility and low tensile modulus under the premise of guaranteeing excellent melt strength, perfect adaptation complex forming process such as extrusion blow molding and 3D blow molding.By introducing special toughening agent and composite thermal stabilizing system, product shows excellent anti delamination performance and heat aging resistance under high temperature of 150 DEG C and dynamic mechanical stress, also has excellent resistance to calcium chloride corrosion ability.Especially prominent, the composition can still maintain high impact toughness under extremely cold environment of-40 DEG C, and has excellent barrier property to hydrogen, solves the technical contradiction of traditional material in new energy automobile hydrogen storage system, improves the use safety and life under extreme working condition.

The invention belongs to the technical field of high polymer materials, and discloses a PP / PA composite material for an automobile front-end module and a preparation method of the PP / PA composite material. Tackifying resin and fumed silica are introduced into a PP and PA resin system to improve polarity, so that PP / PA and long glass fibers are fully infiltrated and bonded during impregnation, the glass fibers are better wrapped, tight combination is formed, the strength of the composite material is improved, and floating fibers are prevented. And the organic-inorganic hybrid heat-resistant agent is introduced, so that the heat aging resistance of the composite material is comprehensively enhanced. The ethylene-butyl acrylate copolymer is introduced, and a butyl acrylate tough chain segment is utilized, so that the glass fiber is prevented from being excessively shorn during injection molding processing, and good rigidity, strength and impact toughness are ensured. The obtained PP / PA composite material is used for the front-end module of the automobile, can provide enough tensile strength, impact toughness and high temperature resistance in the aspects of impact and vibration bearing and heat dissipation, and promotes wide application of the material in the front-end module of the lightweight automobile.

The utility model relates to a base for a quartz crystal resonator, which comprises a shell and a base, a first heat conducting sheet is arranged in the middle of the bottom of the shell, and the bottom of the shell is connected with the upper part of the base; a second heat conduction piece is arranged in the middle of the upper portion of the base and makes contact with the first heat conduction piece, the interior of the base is hollow, and a heat exchange device is arranged on the base. The shell and the base are provided with the first heat-conducting fin and the second heat-conducting fin which are high in heat-conducting property, high temperature in the shell is transmitted to the base through the heat-conducting fins, low temperature in the base is transmitted to the shell, heat exchange is carried out, the shell is cooled, the temperature in the shell is effectively reduced, and the service life of the shell is prolonged. And the problem of thermal aging acceleration of the crystal wafer caused by overheating is reduced, so that the reliability and stability of the resonator are improved, meanwhile, the problem of clock out-of-step caused by temperature change is reduced, and accurate operation of the system is ensured.