352results about How to "High temperature resistance" patented technology

The invention provides a temperature-resistant and salt-resistant cross-linking tackifying filtrate reducer for a soil-phase-free water-based drilling fluid as well as a preparation method and application of the temperature-resistant and salt-resistant cross-linking tackifying filtrate reducer, and belongs to the technical field of drilling. The temperature-resistant and salt-resistant cross-linking tackifying filtrate reducer for the soilless phase water-based drilling fluid comprises the following raw materials in parts by weight: N, N-dimethylformamide, a cross-linking agent and a cross-linking agent, the invention relates to a water-based adhesive which is prepared from the following components in parts by weight: 15 to 25 parts of N, N-dimethylacrylamide, 1 to 10 parts of 3-[(3-methacrylamidopropyl) dimethylammonium] propane-1-sulfonate, 1 to 10 parts of long-chain alkyl polyoxyethylene ether methacrylate, 0.005 to 0.015 part of macromolecular cross-linking agent, 0.03 to 0.08 part of initiator A and 80 to 100 parts of deionized water. The tackifying filtrate reducer can resist the temperature of 180 DEG C, can resist NaCl to be saturated, has excellent tackifying, shear-improving and filtrate-reducing effects under high-temperature and high-salt conditions, improves the rheological property and the filtrate-reducing property of drilling fluid, and ensures safe and efficient drilling of a deep well.

The invention provides analcime based on alkali grinding activation as well as a preparation method and application of the analcime. The preparation method of analcime comprises the following steps: S1, providing lithium slag; s2, ball-milling the solid material and water together to obtain a ball-milled product; the solid material comprises the lithium slag and an alkaline auxiliary material, and the alkaline auxiliary material comprises one or more of sodium hydroxide and potassium hydroxide; s3, mixing the ball-milled product with an alkaline solution to obtain a to-be-treated solution; performing hydro-thermal treatment on the to-be-treated liquid to obtain reaction liquid; and S4, carrying out solid-liquid separation on the reaction liquid to obtain a solid isolate containing analcime. The analcime with high crystallinity and high yield can be obtained, a new way is provided for preparation of the analcime, and a new way is also provided for resourceful treatment of the lithium slag.

The invention discloses an amphiphilic carbon dot, a clean fracturing fluid and application of the clean fracturing fluid. The amphiphilic carbon dot is prepared by performing solvothermal reaction on organic acid and a hydrophobic aliphatic compound. According to the amphiphilic carbon dots provided by the invention, simple preparation of the amphiphilic carbon dots with different structures and properties can be realized by changing the types of the hydrophobic aliphatic compounds, and the clean fracturing fluid prepared by utilizing the amphiphilic carbon dots not only has high temperature resistance and is suitable for reservoirs with relatively high temperature, but also has high salt resistance, so that the clean fracturing fluid can be used for preparing the clean fracturing fluid. And the fracturing fluid has a good fracturing effect in hydrofracture operation of low-permeability and high-salinity oil reservoirs.

The invention provides a nano imbibition displacement agent suitable for shale oil reservoirs and a preparation method thereof, and the nano imbibition displacement agent comprises the following raw materials in parts by weight: 30-50 parts of sulfonated graphene oxide, 10-15 parts of silane coupling agent modified nano silicon dioxide, 10-20 parts of water-soluble cellulose ether, 10-20 parts of fatty alcohol-polyoxyethylene ether, 5-8 parts of lower alcohol and 50-80 parts of water. Graphene oxide reacts with concentrated nitric acid to prepare acidified graphene oxide, then the acidified graphene oxide reacts with thionyl chloride to prepare acylating-chlorinated graphene oxide, and the acylating-chlorinated graphene oxide reacts with a sodium aminobenzene sulfonate derivative to prepare the graphene oxide. Electrostatic repulsive force is generated among graphene oxide particles through surface sulfonation treatment, the dispersing capacity among the particles is improved, agglomeration and flocculation among the particles are avoided, and the recovery efficiency is improved; sulfonated graphene oxide cooperates with a large-molecular-weight water-soluble cellulose ether surfactant, so that the temperature resistance and the salt resistance of the nano imbibition displacement agent can be remarkably improved.

The invention relates to the technical field of petroleum and natural gas development, and discloses a double-sheath mineral insulated heating cable and a preparation method and application thereof. The double-sheath mineral insulation heating cable sequentially comprises a core body, an insulation heat conduction layer, an inner sheath layer and an outer sheath layer from inside to outside. Wherein the yield strength of the inner sheath layer is greater than or equal to 205 MPa, the tensile strength is greater than or equal to 520 MPa, the ductility is greater than or equal to 35%, and the hardness is less than or equal to 32 HRC; the yield strength of the outer sheath layer is greater than or equal to 205 MPa, the tensile strength is greater than or equal to 520 MPa, the elongation is greater than or equal to 35%, and the hardness is less than or equal to 32 HRC; the thickness of the outer sheath layer is 30%-50% smaller than that of the inner sheath layer, the heat conductivity of the inner sheath layer is not larger than that of the outer sheath layer, and the heat conductivity of the inner sheath layer is not smaller than that of the insulating heat conduction layer. The double-sheath mineral insulation heating cable can be suitable for being applied to deep wells and ultra-deep wells of H2S, CO2 and Cl <->, the use temperature is 350-750 DEG C, and the service life is more than 3 years.

The invention discloses an intrinsic flame-retardant antioxidant cross-linked polyolefin composite material and a preparation method thereof. The composite material is prepared from the following raw materials in parts by mass: 34-80 parts of polyolefin, 10-40 parts of flame-retardant unit side group grafted polyethylene, 16-28 parts of a halogen-free flame retardant and 1-2.5 parts of a cross-linking agent. According to the intrinsic flame-retardant antioxidant cross-linked polyolefin composite material, the flame-retardant unit side group grafted polyethylene is hydrolyzed and grafted with different flame-retardant structural units through polyethylene vinyl acetate, so that not only can the physical properties of polyolefin be improved, but also the flame-retardant property and the flame-retardant level of polyolefin can be improved. Besides, the intrinsic flame-retardant antioxidant cross-linked polyolefin composite material provided by the invention still has excellent anti-aging performance under the condition that no antioxidant is added, can achieve excellent flame-retardant and anti-aging effects when being used for preparing materials such as cables and rubber, and can be applied to the fields of buildings, traffic, chemical engineering, machinery, communication, energy and the like.

The invention relates to the technical field of foaming agents, and discloses a high-temperature-resistant foaming agent and a preparation method thereof. The high-temperature-resistant foaming agent is obtained by adding sulphobetaine modified benzoxazine, melamine benzene sulfonate modified polyoxyethylene ether, lauryl sodium sulfate and a polyvinyl alcohol foam stabilizer into water, stirring and mixing. The benzoxazine structure has relatively high rigidity and stability at a high temperature; sulfobetaine is an ampholytic surfactant and has high foaming capacity, sulfonic acid groups are high in temperature resistance, and the foaming performance and the high temperature resistance of the foaming agent are improved; melamine molecules are not easy to decompose at high temperature, so that the high temperature resistance of the foaming agent is improved; polyoxyethylene ether is a nonionic surfactant and has remarkable surface activity, the sulfonic acid group anions and the polyoxyethylene ether nonionic surfactant play a synergistic role, mixed micelles are formed in an aqueous solution, and the foaming performance of the foaming agent is improved.

The utility model relates to the technical field of sealing rubber rings, and discloses a reinforced composite sealing rubber ring which comprises a rubber sealing ring, a groove is formed in the center of the interior of the rubber sealing ring, a reinforcing layer is arranged in the center of the inner wall of the groove, and three fixing rings are transversely arranged on the outer side wall of the rubber sealing ring. A plurality of first microcapsules are arranged at the positions, close to the outer sides, of the centers in the three fixing rings, and a plurality of second microcapsules are arranged at the positions, close to the outer sides, of the centers in the rubber sealing rings. According to the utility model, through the arrangement of the fixing ring made of fluororubber, the sealing ring has high temperature resistance and chemical corrosion resistance, can also be reasonably pre-tightened, ensures that proper contact stress is generated in a normal working range, and further improves the sealing effect, and through the arrangement of the first microcapsule and the second microcapsule, the sealing performance is improved. And when being damaged and worn, the material fills the damaged part and automatically repairs the damaged part, so that the service life of the material is prolonged.

The invention relates to the technical field of aviation optical cables, in particular to a high-temperature optical cable for aviation and a preparation method of the high-temperature optical cable for aviation, and the high-temperature optical cable for aviation comprises a high-temperature optical fiber, a stainless steel loose sleeve protection tube, a fiber-woven reinforcement piece and a high-temperature-resistant polymer sheath, the stainless steel loose tube protection tube is sleeved with the fiber woven reinforcing piece, and the fiber woven reinforcing piece is sleeved with the high-temperature-resistant polymer sheath; according to the technical scheme, the temperature resistance grade of the aviation optical cable can be improved to 300 DEG C, and the product is small in structural size and light in weight and has good use characteristics of tensile strength, compression resistance, bending resistance and the like.

The invention relates to the technical field of injection molds, in particular to a high-temperature-resistant injection mold which comprises a movable mold and a static mold forming mold opening and closing operation with the movable mold, guide columns are arranged at the four corners of the forming face of the static mold, and liquid bags are further arranged in a left positioning cavity and a right positioning cavity correspondingly. The front side and the rear side of each liquid bag are each provided with a first hose, the sprayers on the four sets of pipelines are automatically opened, a product piece is rapidly cooled in the mode that cooling liquid is sprayed diagonally, and the four sprayers will automatically stop spraying liquid till the cooling liquid compressed in the first hoses in advance is completely discharged. And the spray head is elliptical, and when the cooling liquid is sprayed outwards, the cooling liquid acts on the injection molding product part in a large area, so that the cooling efficiency of the injection molding product part is improved. The four nozzles stop the liquid spraying action, automation can be achieved without manual operation or complex mechanical structures, and the control mode is simple in structure.

The superfine bi-component fiber composite needled felt comprises a needled felt body, the bottom layer of the needled felt body is formed by a base layer, the surface layer of the needled felt body is provided with a wear-resistant layer, the top of the base layer is provided with a high-temperature-resistant layer, and the bottom of the wear-resistant layer is provided with a corrosion-resistant layer. And a flame-retardant layer is arranged between the corrosion-resistant layer and the high-temperature-resistant layer. According to the superfine bi-component fiber composite needled felt and the preparation process thereof, in the preparation process, mixed fibers and superfine PSPA sea-island fibers are added, the wear resistance is improved, and through arrangement of the Portland cement polystyrene foam slurry layer, the superfine glass fiber composite filter material, the reinforcing layer and the polysulfonamide fiber layer, the wear resistance is improved; the needle-punched felt has the advantages that the needle-punched felt is high-temperature-resistant, the overall high-temperature-resistant performance of the needle-punched felt is improved, the corrosion resistance is improved due to the arrangement of the PTFE fibers and the polytetrafluoroethylene film coating layer, the flame retardance of the needle-punched felt is enhanced due to the knitted aluminum silicate fibers and the PPS fiber layer, and the overall use performance of the needle-punched felt is improved.

The utility model relates to the technical field of cables, and provides a novel high-voltage shielding cable for a new energy automobile, which comprises an outer protection layer, the outer surface of the outer protection layer is fixedly connected with a circle, the inner wall of the circle is provided with a plurality of clamping holes, and the outer surface of the outer protection layer is fixedly connected with a plurality of L-shaped blocks. When one outer protection layer is bent or the inner conductive terminal is broken, the pull rod can be pulled to drive the limiting disc and the clamping rod to move, and the conductive terminal is inserted into the inner part of the end hole side, so that the length of the cable body is increased, and data transmission and power-on can be performed between the cable body and the outer protection layer. And after the clamping rod is separated from the interior of the clamping hole, one outer protection layer can be separated from the other outer protection layer for replacement, and the whole very long conductive terminal does not need to be replaced, so that the use cost is reduced.

The invention discloses a coke guide grid of a coke barrier car, and belongs to the technical field of coke barrier cars in coking plants, the coke guide grid comprises the coke barrier car and the coke guide grid, the upper part of the coke barrier car is provided with a track, the coke guide grid is connected with a hanging roller sliding on the track, and the coke barrier car is provided with a driving mechanism for driving the coke grid to move; a compensation plate is arranged on the side wall of the end, close to the furnace mouth, of the coke guide grid in a sliding mode, high-temperature asbestos cloth is detachably connected to the compensation plate and abuts against the side wall of the furnace mouth, a moving assembly used for driving the compensation plate to move is arranged on the coke guide grid, and a dust removal device used for removing dust is arranged on the coke barrier vehicle. The application has the effects of reducing the coke receiving gap between the joint surfaces of the coke guide grid and the furnace mouth, further reducing the leakage of pollutants such as coke smoke and the like, and enhancing environmental protection.

The invention discloses a mineral casting prepared based on modified epoxy resin. Diacid is used for modifying epoxy resin to enhance the temperature resistance of the epoxy resin. The compressive strength of the mineral casting and the bonding strength between the epoxy resin and the aggregate are enhanced in a manner of combining the curing agent and post-curing treatment; by adding the dispersed nano silicon dioxide into the epoxy resin, the damping ratio of the mineral casting is effectively improved, and the shock absorption performance of the mineral casting is enhanced.

The invention discloses a rock modifier and application thereof in tight gas reservoir exploitation, and relates to the technical field of oil and gas exploitation, the rock modifier comprises the following components by weight: 10-30 parts of 3-aminopropyltrimethoxysilane, 20-40 parts of perfluorinated organic acid or perfluorinated organic acid salt, and 40-80 parts of a 40-60vt% ethanol solution. The invention further discloses application of the rock modifier in hydrophobic and oleophobic modification of the rock surface and exploitation of tight gas reservoirs. The rock modifier can perform stable hydrophobic and oleophobic modification on the rock surface, is resistant to high temperature and scouring, can maintain the wettability improvement effect for a long time, has the effects of guaranteeing smooth flowback of fracturing fluid and improving the oil and gas recovery ratio, and has a relatively high application value in tight gas reservoir exploitation.

The invention belongs to the technical field of crucible manufacturing, and particularly relates to a composite ultra-high-temperature quartz crucible and a preparation method thereof.The composite ultra-high-temperature quartz crucible is prepared from 10-12 parts of a main body mixture, 0.5 part of an inner coating material and 2-3 parts of an outer substrate material; high-purity quartz sand is treated under an alkaline condition to obtain hydroxylated quartz sand, the hydroxylated quartz sand reacts with a silanol solution to obtain condensed quartz sand, high-purity graphite powder and high-purity carbon powder are further added, oxygen of the condensed quartz sand is partially substituted, composite quartz sand rich in Si-O-Si bonds and Si-C bonds is obtained, the high-purity silicon powder serves as a substrate, high-purity silicon nitride is introduced, and the composite quartz sand is prepared. The main body mixture is prepared to improve the overall temperature resistance and thermal shock resistance of the material; an inner coating material is arranged on the inner layer, so that the material is prevented from being corroded; the outer substrate material is arranged on the periphery, so that the overall strength and toughness of the quartz crucible are enhanced, and corrosion of the external environment to the quartz crucible is resisted.

The present invention discloses a preparation method and application of Kappa-carrageenan flexible conductive organic gel suitable for ultra-wide temperature range. The present invention adds 18-crown ether-6 with good solubility to glycerol or a glycerol-based mixture to solubilize potassium salt, and selects Kappa-carrageenan as a gel matrix, and dissolves the above components by heating, and a stable Kappa-carrageenan flexible conductive organic gel can be obtained after cooling. The organic gel prepared by the present invention still maintains good flexibility after being refrigerated for 24 hours under an environment of 80°C, and can be stably present for a long time in a high temperature environment of up to 80°C, while having better mechanical and conductive properties. The preparation method of the present invention is simple, efficient, and low-cost, and can have a relatively broad application prospect in extremely harsh environments and flexible electronic devices.

The invention discloses a crosslinkable perfluoroelastomer and a preparation method and application thereof, the preparation method comprises the following steps: (1) mixing nitrile perfluoroalkyl vinyl ether, a fluorocarbon solvent, deionized water and an emulsifier, and emulsifying to obtain a nitrile perfluoroalkyl vinyl ether microemulsion; (2) adding raw materials containing the nitrile perfluoroalkyl vinyl ether microemulsion, perfluoromethyl vinyl ether, tetrafluoroethylene and an initiator into a high-pressure polymerization kettle, and carrying out a copolymerization reaction; (3) after the copolymerization reaction is finished, cooling, emptying the pressure of the polymerization kettle to normal pressure, and taking out the emulsion in the kettle; and (4) demulsifying, condensing, filtering, washing and drying the emulsion in the kettle to obtain the crosslinkable perfluoroelastomer. The copolymer has higher molecular weight and crosslinking degree, and can be used as a sizing material of the perfluoroether rubber to perform vulcanization reaction in a rubber system without a crosslinking agent or with peroxide as a crosslinking agent, and the obtained perfluoroether rubber has excellent high temperature resistance.

The invention relates to the technical field of surface corrosion prevention, and discloses a high-strength corrosion-resistant steel bar surface epoxy coating and a preparation method thereof. The high-strength corrosion-resistant steel bar surface epoxy coating comprises the following components in parts by weight: 1-5 parts of modified polyaniline / TiO2 powder, 8-10 parts of aluminum triphosphate, 8-10 parts of zinc phosphate, 8-10 parts of talcum powder, 10-15 parts of barium sulfate, 100-200 parts of modified epoxy resin, 50-100 parts of a curing agent, 10-20 parts of an accelerant and 1-3 parts of a flatting agent. The modified polyaniline / TiO2 high-strength corrosion-resistant epoxy coating provided by the invention has the advantages of self-cleaning, scratch resistance, corrosion resistance, wear resistance and the like, and polyaniline has excellent host capability of capturing nano particles and can be co-doped with some active inorganic nano particles to effectively improve the solubility and corrosion resistance of the nano particles. And the modified epoxy resin has the characteristic of high temperature resistance, so that more comprehensive protection is further provided for the reinforcing steel bar. The method is low in cost and environment-friendly, and has good social and economic benefits.

The invention provides a flame-retardant cellulose aerogel reinforced resin material as well as a preparation method and application thereof. The limit oxygen index of the resin material in air is 20%-50%. The preparation method comprises the following steps: mixing nanocellulose with deionized water, acidizing, and adding a silicon compound to obtain a cellulose-silicon suspension; and suspending a resin material sample strip in a mold, pouring the cellulose-silicon suspension into a gap between the resin material sample strip and the mold, freezing, demolding, drying and baking to obtain the cellulose-silicon composite material. The obtained resin material can be well applied to the fields of reinforced modified plastics, buildings, electric heating and heat insulation materials, and the flame retardant property of the composite material can be remarkably improved under the condition that the strength of the resin material is maintained.

The invention discloses a high-temperature-resistant film composite sensor and a preparation method thereof. The sensor comprises a YSZ coating, an Al2O3 layer, a SiO2 layer, a functional layer and a composite protection layer which are sequentially arranged on the surface of a metal substrate from bottom to top. The preparation method comprises the following steps: spraying the metal substrate, spraying the YSZ coating, polishing, preparing the Al2O3 layer, carrying out heat treatment, preparing the SiO2 layer and the composite protective layer, and carrying out heat treatment on the composite protective layer. The high-temperature-resistant film composite sensor can stably work for 48 hours under the ultrahigh-temperature condition of 1500 DEG C under the combined action of the films, has the advantages of being high in detection precision, long in service life and the like, and can be used for measuring working parameters of engine blades at high working temperature and high rotating speed at the same time. Meanwhile, the preparation method has the advantages of being simple in process, convenient to operate, low in preparation cost, high in yield and the like, is suitable for large-scale preparation and facilitates industrial application.

The invention provides a preparation method of a biological functional agent containing bioactive components, which comprises the following steps: dispersing the bioactive components in water; adding the zeolite-loaded titanium dioxide composite material, absolute ethyl alcohol, isopropyl triisostearoyl titanate and polyvinylpyrrolidone into the mixed solution, stirring at the temperature of 65-75 DEG C to obtain a mixed solution containing bioactive components, stirring for 80-100 minutes, and centrifugally drying to obtain the composite material. According to the preparation method of the biological functional agent containing the bioactive components, the loading capacity of the bioactive components on the carrier is improved, the stability of the bioactive components is improved, and the slow release effect is enhanced, so that the preparation efficiency and performance of the biological functional agent are improved; wide prospects are provided for application in the fields of medicines, cosmetics, environmental protection and the like.

The invention discloses silanized polyphenyl ether resin and a preparation method thereof, and a high-temperature-resistant low-dielectric material and a preparation method thereof. The preparation method of the high-temperature-resistant low-dielectric material comprises the following steps: reacting polyphenyl ether resin with a brominating agent to obtain brominated polyphenyl ether resin, and carrying out amination reaction on the brominated polyphenyl ether and allylamine to obtain polyphenyl ether resin with high allyl content; the preparation method comprises the following steps: under the action of a photoinitiator, carrying out sulfydryl-alkene click chemical reaction on allyl polyphenyl ether resin and sulfydryl silane under an ultraviolet light condition to obtain silanized polyphenyl ether resin, or carrying out hydrosilylation reaction on the allyl polyphenyl ether resin and hydrogen-containing silane under the action of a catalyst to obtain the silanized polyphenyl ether resin; and carrying out moisture curing under the action of a catalyst to obtain the high-temperature-resistant low-dielectric material with excellent performance. The preparation and curing method is simple and convenient, the raw materials are easy to obtain, moisture curing can be realized, and the cured material has the characteristics of excellent high temperature resistance and low dielectric property.

The invention provides an improved high-toughness M2 high-speed steel flux-cored wire and a preparation method thereof.The flux-cored wire comprises an outer skin and a flux core, and deposited metal of the flux-cored wire comprises, by weight, 0.5%-1.6% of boron, 0.5%-1.6% of molybdenum, 0.5%-1.6% of molybdenum, 0.5%-1.6% of molybdenum, 0.5%-1.6% of molybdenum, and the balance iron and inevitable impurities. 0.6 to 1.3 percent of carbon; 1 to 1.6% of silicon; 0.3%-0.9% of manganese; 1-2.2% of vanadium; 0.3 to 0.7 percent of nickel; 0.3 to 0.7 percent of cobalt; 3-8% of chromium; 1.5%-2.2% of niobium; 5% of molybdenum; 6% of tungsten; and the balance of iron. The preparation method comprises the steps that all the components of the flux core are sequentially added into a drying machine and then put into a three-dimensional motion mixing machine to be fully and evenly mixed, then the mixture is put into a heat preservation box to be subjected to heat preservation, and obtained flux core powder is reserved for use; rolling the outer skin into a U-shaped groove; flux core powder is added into the U-shaped groove, a forming machine rolls and closes the U-shaped groove and draws the U-shaped groove, and the flux-cored wire is obtained; the flux-cored wire has the characteristics of high toughness and high wear resistance, and compared with plasma and laser cladding powder materials with the same performance, the flux-cored wire is lower in production cost and more beneficial to industrial production.

The utility model relates to the technical field of aluminum alloy wallboards, and discloses an aluminum alloy composite insulation board which comprises an insulation board body, connecting grooves are formed in one side and the front end of the insulation board body, connecting blocks are fixedly arranged on the other two sides of the insulation board body, first fixing holes are formed in the middles of the two connecting grooves, and the first fixing holes are communicated with the connecting blocks. And second fixing holes are formed in the middle parts of the two connecting blocks. According to the thermal insulation board, when the thermal insulation board is installed and spliced, the connecting blocks are clamped into the corresponding connecting grooves, and screws penetrate through the first fixing holes and the second fixing holes to be fixed to the wall face, so that every two adjacent thermal insulation boards are connected and installed in the paving process, and compared with a traditional thermal insulation board, the thermal insulation board is more compact in overall effect after being installed; and the whole stability is improved through end-to-end connection, the paving process can be simplified, fewer screws are used, and manpower and material resources are saved.

The invention relates to a branched ultrahigh-salt and ultrahigh-temperature resistant polyacrylamide polymer as well as a preparation method and application thereof. The preparation method comprises the following steps: obtaining the polyacrylamide polymer with a branched structure by adopting a reducing agent octamethylpentaethylenehexamine; the branched polymer has a larger hydrodynamic volume and a denser intermolecular network structure, has better shear resistance, and can obtain a higher resistance factor and a higher residual resistance factor in a porous medium; and the problems of polymer molecule curl and obvious solution viscosity reduction caused by the electrostatic shielding effect can be weakened under the high-salt condition.

The invention discloses an anisotropic enhanced electromagnetic shielding piece with structural orientation, ink of the anisotropic enhanced electromagnetic shielding piece and a 3D printing preparation method of the anisotropic enhanced electromagnetic shielding piece, and belongs to the technical field of electromagnetic shielding materials and 3D printing. And the laying direction of the filiform materials of each layer of plane unit is parallel to the same basic plane. By adjusting the plane units to be perpendicular to the incident direction of electromagnetic waves, the shielding effect in the incident direction is enhanced, meanwhile, basic shielding requirements in other directions are guaranteed, and anisotropic electromagnetic shielding is achieved. In addition, high-length-diameter rigid particles are added to assist the shearing effect of a 3D printing one-way extrusion flow field, ordered arrangement of multi-dimensional nanoparticles is induced, a microscopic oriented conductive network is constructed, and a conductive path is optimized, so that the shielding performance of the material is further enhanced. The anisotropic electromagnetic shielding performance is achieved, and meanwhile the electromagnetic shielding effect of the material is improved.

The utility model discloses a novel backflow jig which comprises a carrier plate and a cover plate matched with the carrier plate to clamp a substrate, the upper surface of the carrier plate is provided with a positioning area used for placing the substrate, and a plurality of first hollow areas used for avoiding components on the substrate are distributed at the bottom of the positioning area. A plurality of first hollowed-out areas are arranged on the base plate, first rubber strips are arranged on the periphery of the outer side of a notch of each first hollowed-out area, a plurality of second hollowed-out areas are arranged on the cover plate, the number and the positions of the second hollowed-out areas correspond to those of the first hollowed-out areas, second rubber strips are arranged on the periphery of the outer side of a notch of each second hollowed-out area, and the first rubber strips correspond to the second rubber strips up and down to press the base plate. The first rubber strip is installed on the carrier plate through a first fixing structure, and the second rubber strip is installed on the cover plate through a second fixing structure. According to the structure, the substrate is prevented from being scratched, bumped or scratched in the backflow process.

The invention provides a battery diaphragm, a preparation method thereof and application of the battery diaphragm in a lithium ion battery. The battery diaphragm comprises a base membrane and a coating positioned on any side or two sides of the base membrane, wherein the coating contains self-polymerized microporous polyimide microspheres and inorganic particles. According to the battery diaphragm as well as the preparation method and the application thereof in the lithium ion battery provided by the invention, the self-polymerized microporous polyimide microspheres and the inorganic particles are compounded to form the base membrane coating, so that the surface density lower than that of a pure inorganic particle coated diaphragm can be obtained; and the self-polymerization microporous structure of the polyimide microspheres can adsorb metal ions separated out from a battery system, so that the safety and the cycle performance of the battery are improved.

The utility model provides a centrifugal composite high-speed steel roller, which belongs to the technical field of high-speed steel rollers and comprises a roller body and a reinforcing component, the reinforcing component comprises a high-speed steel layer arranged on the outer wall of the roller body, the high-speed steel layer is made of high-speed steel, and a wear-resistant reinforcing layer is arranged inside the high-speed steel layer and made of hard alloy. A wear-resistant reinforcing layer is arranged in the roller body, a transition layer is arranged in the wear-resistant reinforcing layer, the transition layer is made of nodular cast iron, a toughness reinforcing layer is arranged in the transition layer, and the toughness reinforcing layer is made of alloy steel. The high-speed steel can effectively resist high temperature and high pressure, the rolling precision and surface quality of the roller are ensured, the nodular cast iron can be more stable due to the good toughness and strength, the alloy steel is utilized, breakage or damage is conveniently prevented in the rolling process during die casting, and the roller is firm and durable.