99 results about "Fluorinated ethylene propylene" patented technology

The floatable instantaneous generator comprises an outer layer in the form of a hemispherical floatable supporting bowl and an inner layer in the form of a liquid-solid triboelectric nano generator (ls TENG); the inner layer includes a fluorinated ethylene propylene (FEP) layer on an inner side of the bowl, a ring electrode on an upper surface of the FEP layer around a periphery thereof, a circular electrode on a bottom surface at a central portion of the FEP layer, and a droplet slidable on the upper surface of the FEP layer. When subjected to open sea waves, the bowl floats and tilts the ls TENG so as to slide droplets on the upper surface of the FEP, thereby creating and disconnecting contact between the ring electrode and the circular electrode and providing power to an electrical circuit connected between the ring electrode and the circular electrode.

The invention relates to a high-conductivity and low-ventilation-resistance gas diffusion layer and a preparation method and application thereof. The gas diffusion layer comprises a supporting body and a microporous layer located on the surface of the supporting body, the microporous layer is formed by microporous layer slurry, and the microporous layer slurry comprises conductive filler, a wetting agent, a water repellent agent and water; the conductive filler comprises conductive carbon black AC80; the hydrophobic agent is selected from polytetrafluoroethylene and / or FEP (fluorinated ethylene propylene). The gas diffusion layer has excellent surface appearance performance and comprehensive performance such as conductivity, compression ratio and ventilation resistance.

The invention relates to the technical field of oil-water separation, in particular to a super-hydrophobic foam copper sheet, a preparation method and application thereof and a foam copper box. The invention provides a super-hydrophobic foam copper sheet. The super-hydrophobic foam copper sheet comprises a foam copper sheet body and a hydrophobic coating located on the surface of the foam copper sheet body. The hydrophobic coating is obtained by calcining preparation raw materials including a fluorinated ethylene-propylene copolymer, polyvinylidene fluoride, polyurethane and hydrophobic silicon dioxide nanoparticles. The super-hydrophobic foam copper sheet can realize continuous and rapid oil absorption, and has excellent oil-water separation efficiency.

The invention relates to the technical field of nano materials, and provides a preparation method and application of a friction nano generator with high surface charge density. The invention aims to overcome the defects of low surface charge density, environmental influence, easy aging and the like in high-frequency mechanical energy collection of the existing friction nano-generator, and the application of the friction nano-generator in environmental mechanical energy collection is improved. The main scheme is as follows: 4, the preparation method comprises the following steps: dissolving 4, 4 '-diaminodiphenyl ether in N, N'-dimethylacetamide, adding diphenyl ether dianhydride into the solution to synthesize a polyamide acid solution, carrying out electrospinning and high-temperature treatment on the solution to obtain an imidized nanofiber membrane, treating the surface of the nanofiber membrane through a plasma sputtering instrument, selecting a fluorinated ethylene-propylene copolymer as an electric negative electrode material, and carrying out electrospinning and high-temperature treatment on the surface of the nanofiber membrane. And pasting an electrode and packaging to construct the friction nano generator. The invention is used in the fields of friction power generation, mechanical sensing and the like, and has the advantages of simple process, high preparation speed, high yield, low cost, good robustness, no environmental influence and high output performance.

The invention belongs to the technical field of PTFE (polytetrafluoroethylene) coating materials, and particularly relates to a polytetrafluoroethylene resin material as well as a preparation method and application thereof. The polytetrafluoroethylene resin material provided by the invention comprises the following preparation raw materials in parts by mass: 90-100 parts of polytetrafluoroethylene, 1-10 parts of an organic additive and 15-25 parts of a lubricant, the organic additive comprises a perfluoroalkoxy resin and / or a fluorinated ethylene propylene copolymer. The obtained polytetrafluoroethylene resin material is better in flexibility, the produced E + PTFE coating pad can be softer, the sealing performance and the pressure bearing capacity are improved, and the problems that a PTFE coating membrane is high in hardness and poor in flexibility are solved; and meanwhile, the polytetrafluoroethylene resin material provided by the invention is transparent in character, and even if bubbles are generated in the E + PTFE coating pad during preparation, the bubbles can be found in time, so that the product quality is ensured.

The invention discloses a high-temperature-resistant thermal control film and a preparation method thereof, relates to the technical field of thermal control materials, and aims to solve the problems that the high temperature resistance, the mechanical strength and the component compatibility of a traditional thermal control film are difficult to consider at the same time, and the aging resistance and the environmental corrosion resistance are poor. The preparation method comprises the following steps: by taking polytetrafluoroethylene and fluorinated ethylene propylene as matrixes, firstly preparing silicon-fluorine modified graphene and a modified cross-linking agent, and then preparing a product through the steps of preparation of fluoroalkene grafted graphene composite powder, preparation of pre-crosslinking type mixed slurry, film casting and stepped drying, cross-linking curing, segmented post-curing and the like. Through synergistic modification, a compact three-dimensional cross-linked network is constructed, and process optimization is matched, so that the prepared film has excellent high-temperature-resistant stability, mechanical strength, heat insulation and temperature control effects and flame retardance, and can be widely applied to the fields with strict requirements on thermal control materials, such as aerospace, electronic and electrical engineering and the like.

The invention relates to the technical field of chlorinated polyvinyl chloride wire and cable materials, and discloses a flame-retardant aging-resistant wire and cable and a preparation method thereof.The preparation method of the flame-retardant aging-resistant wire and cable comprises the following steps that polyvinyl chloride is grafted through furfuryl alcohol and composite modified POSS in sequence, and functional polyvinyl chloride is obtained; preparing a cross-linking agent and a multi-element modified flame retardant; grafting the multi-element modified flame retardant on the composite nano material through a cross-linking agent to obtain a modified composite nano material; a copper wire is wound outside the conductor to form a shielding layer, and then fluorinated ethylene propylene is wrapped outside the shielding layer to form an insulating layer; and extruding a sheath layer material outside the insulating layer to form a sheath layer so as to obtain the flame-retardant and aging-resistant wire and cable. The sheath layer of the flame-retardant and aging-resistant electric wire and cable has good flame retardance, aging resistance, water resistance, mechanical strength and toughness, and the electric wire and cable prepared from the sheath layer is excellent in comprehensive performance and can meet the use requirements in various occasions.

The invention discloses a high-electrical-performance cable structure, and the structure comprises two independent wires, and the cross section of each wire is similar to a circle. Each insulating layer is made of a fluorinated ethylene propylene copolymer sizing material, the cross section of each insulating layer is in a ring shape, and each insulating layer tightly wraps the outer side surface of the corresponding wire; the outer protective layer is made of fluorinated ethylene propylene copolymer sizing materials and integrally wraps the outer sides of the two insulating layers; the two wires wrapped by the insulating layers are arranged adjacently, and the outer protective layer fills and seals a gap between the two insulating layers and a peripheral space of the two insulating layers. According to the high-electrical-performance cable structure, physical isolation of the independent insulating layer is combined with continuous filling of the FEP outer protective layer medium to form a cable core structure, and low-crosstalk, low-loss and high-stability signal transmission is electrically realized by coupling optimization of a low-dielectric-loss FEP material.

The invention discloses a method for preparing a fluorinated ethylene-propylene emulsion, and relates to a polymer emulsion polymerization technology. Comprising the following steps: adding water into a reaction kettle, heating, and replacing with nitrogen to control oxygen; adding perfluoropolyether ammonium carboxylate, heating, adding an initial TFE / HFP mixed monomer, stirring, and adding a potassium persulfate solution to initiate polymerization; supplementing the mixed monomer in the reaction to maintain the pressure, and adding diethyl malonate and a copolymerization composition regulator at the same time; and stopping the reaction after the designed feeding amount is reached. According to the invention, the proportion of copolymerization units can be optimized, high monomer conversion is realized, and the emulsion with high solid content and uniform particle size is obtained.

The invention discloses a friction nano generator with a controllable negative Poisson's ratio structure, which comprises a three-layer structure, the upper layer is a polydimethylsiloxane skeleton with a negative Poisson's ratio structure, the middle layer is a positive friction layer, and the positive friction layer is a polyethyleneimine modified collagen aggregate; the upper layer is a polydimethylsiloxane skeleton, the lower layer is a negative friction layer, the negative friction layer is a fluorinated ethylene propylene copolymer containing a negative Poisson's ratio structure, the polydimethylsiloxane skeleton and the positive friction layer are subjected to curing connection, and the positive friction layer and the negative friction layer are connected through elastic foam. The invention also discloses a preparation method of the friction nanometer generator. According to the friction nano-generator with the controllable negative Poisson's ratio structure, the effective contact area of the friction layer in the contact-separation process is increased by utilizing the deformable characteristic of the negative Poisson's ratio structure, so that charge transfer is enhanced, the output power and stability are improved, and the friction nano-generator can adapt to the mechanical energy collection requirement in a complex environment; the method is suitable for the fields of wearable equipment, intelligent medical treatment, sports protection equipment and the like.

The utility model discloses an environment-friendly tensile soft copper stranded wire, which comprises a copper stranded wire core part and a plurality of steel wire core parts, the plurality of steel wire core parts are uniformly distributed around the copper stranded wire core part, a fixing sleeve is arranged on the outer side of the plurality of steel wire core parts, a wire sleeve is arranged on the outer side of the fixing sleeve, and the wire sleeve is arranged on the outer side of the fixing sleeve. According to the utility model, a composite structure of the fluorinated ethylene propylene rubber layer, the polytetrafluoroethylene layer and the corrosion-resistant rubber layer is sequentially arranged outside the copper wires, so that the high-temperature resistance of the copper wires is improved, the copper wires are safe and environment-friendly, and the plurality of copper wires are wound and stranded together to form the copper stranded wire core, so that the tensile strength of the wire core is enhanced, and the service life of the copper wires is prolonged. The flexible copper stranded wire has the advantages that the flexible copper stranded wire is not damaged during working, the service life of the flexible copper stranded wire is prolonged, the outer side of the copper stranded wire core is continuously coated with a plurality of steel wire cores, the overall tensile strength is further enhanced, a fixing sleeve is arranged on the outer side of the steel wire cores, and the outer side of the fixing sleeve is coated with a wire sleeve, so that the wear resistance of the overall flexible copper stranded wire is improved.

The utility model discloses a fluorinated ethylene propylene insulated wire, which relates to the technical field of wires and comprises a plurality of wire cores, positioning ribs are arranged among the plurality of wire cores, an insulating sleeve is arranged on the outer side of the plurality of wire cores, a protective outer layer is arranged on the outer side of the insulating sleeve, a cavity is arranged in the middle of the positioning ribs, and the positioning ribs are arranged in the cavity. A plurality of positioning grooves are formed in the outer side wall of the positioning rib in a surrounding mode. According to the utility model, the wire cores are arranged, the positioning ribs are arranged on the inner sides of the wire cores, the insulating sleeves are arranged on the outer sides of the wire cores, and the positioning ribs are matched with the insulating sleeves, so that the positioning of the plurality of wire cores can be realized, and the winding of the plurality of wire cores in the wire laying process can be avoided; the fluorinated ethylene propylene can realize positioning protection of the wire core through the characteristics of high temperature resistance and wear resistance, so as to ensure the stability of the wire in the use process.

The present disclosure relates to an optical fiber cable (400, 500) comprising one or more optical fibers (202), a coating (104) disposed on an outermost surface (108) of the one or more optical fibers (202), and a sheath (406) surrounding the one or more optical fibers (102). In particular, the coating (104) has a thickness less than 10 micrometres (μm). Further, the coating (104) is made up of a fluoropolymer based hydrophobic resin material such as, perfluoroalkoxy (PFA), fluorinated ethylene propylene (FEP), ethylene tetrafluoroethylene (ETFE), and terapolymer (EFEP).

A combustion head assembly for a burner that reduces combustion byproduct and oil pooling on a flame ring stabilizer or air diffuser element during normal operational cycling. The polymeric bushing directs away or prevents a non-combusted fuel in the fuel line interior portion from the nozzle end after a combustion cycle, and is fabricated from a polymeric material having thermal / electrical insulating properties, which is resistant to decomposition, dissolution, or breakdown when exposed to No. 2 fuel oil, biodiesel fuel oil, such as fluoropolymers, including PTFE (Teflon), fluorinated ethylene propylene (FEP), perfluoroalkoxy (PFA), ethylene-based fluoropolymers (ETFE / ECTFE), and / or polyvinylidene fluoride (PVDF), polyether ether ketones (PEEK), polyphenylene sulfide (PPS), and / or fluoroelastomers (FKM), or acrylonitrile butadiene styrene (ABS). The polymeric bushing is situated within a fuel line interior portion behind a nozzle element, having a channel or bore extending from end to end and in fluid communication with the nozzle element opening.

The invention discloses a preparation process of a transparent bag for cell resuscitation, which comprises the following steps of: 1, preparing raw materials: selecting FEP (Fluorinated Ethylene Propylene) particles meeting the biocompatibility requirement as a main raw material, and preferentially selecting a medical-grade raw material with the purity of more than or equal to 99.9 percent; after the raw materials are selected, FEP particles are put into a vacuum drying oven and dried for 4-6 hours under the conditions that the temperature is 80-100 DEG C and the vacuum degree is smaller than or equal to-0.09 MPa, residual moisture in the raw materials is removed, and the situation that bubbles are generated during extrusion to affect the quality of the thin film is avoided; and 2, hot melting and film pressing: putting the FEP particles dried in the step 1 into an extruder, and melting the FEP particles. Then, the molten FEP is extruded into a film shape through an extruding machine head, the film is subjected to thickness adjustment and surface flattening treatment through a calendering device, and an FEP film with a certain thickness and width is prepared; according to the invention, FEP particles are pretreated, and then five-stage gradient temperature degradation and three-stage cooling of the extruder are carried out, so that the prepared film is uniform and smooth, and the rejection rate is reduced.

The invention provides a leather material and a preparation method and application thereof.The leather material comprises a base material and a surface layer existing on the surface of at least one side of the base material, the surface layer comprises a cross-linked product of a first polymer, the first polymer comprises a fluorine-containing polymer, and the fluorine-containing polymer is a fluorine-containing polymer. The fluorine-containing polymer comprises one or more of a first fluorine-containing copolymer, polyvinylidene fluoride, fluorinated ethylene propylene and a second fluorine-containing copolymer; the first fluorine-containing copolymer is a copolymer formed by copolymerizing chlorotrifluoroethylene and vinyl ether; the second fluorine-containing copolymer is a copolymer formed by copolymerizing at least two monomers of tetrafluoroethylene, chlorotrifluoroethylene and vinylidene fluoride. The stain resistance, wear resistance, weather resistance and other properties of the leather material can be improved.

The invention discloses a step-by-step polymerization efficient preparation technology of fluorinated ethylene propylene, and relates to the technical field of fluorine-containing polymers. The method is realized through two-step emulsion polymerization. In the first step, an initial emulsion is prepared, in the second step, the initial emulsion is used for expansion polymerization, and finally the high-purity FEP emulsion is obtained. The method has the advantages of simplicity and convenience in operation, easiness in control of reaction conditions, high polymerization efficiency and the like, and can be widely applied to preparation of high-performance fluorine materials.

The invention discloses preparation of FEP (fluorinated ethylene propylene) resin with low crystal point content, and relates to the technical field of fluorine-containing polymers. The preparation method comprises the following specific steps: mixing gas before feeding, controlling the proportion, adding deionized water and a surfactant into a reaction kettle, stirring at a high speed, then adding the mixed gas, keeping stirring, heating, adding a low-crystal-point accelerant, adding an initiator solution to initiate a copolymerization reaction, continuously supplementing the mixed gas and an initiator during the period, maintaining the pressure and the temperature, and continuously adding the initiator; and at the later stage of the reaction, reducing the stirring speed and continuously supplementing until the reaction is finished to finally obtain the copolymer emulsion. Compared with an original FEP water-phase reaction system, the method has the advantages that the content of crystal points in an FEP product is effectively reduced; the emulsion breaking phenomenon in the original FEP water phase polymerization process is reduced.

The invention discloses a high-temperature-resistant anti-interference signal cable for coal bed gas rodless gas production equipment. The anti-interference capability of the cable is improved through triple anti-interference design of twisted wire groups, branch shielding layers and a total shielding layer; the insulating layer adopts the inner sheath in which fluorinated ethylene propylene is matched with fluororubber, so that the cable can work stably in a high-temperature environment, and the durability and the reliability of the cable are improved; the total shielding layer and the armor layer are both of a steel wire structure, so that the tensile strength and the pressure resistance of the cable are ensured. The high-temperature-resistant anti-interference signal cable for the coal bed gas rodless gas production equipment has the advantages of being firm in structure, resistant to high temperature, resistant to interference, stable in transmission and long in service life.

In optical microscopy including fluorescence microscopy, a biological sample (215) can be immersed in an aqueous liquid medium (210) during observation. Due to the refractive index mismatch between the liquid medium and a conventional glass bottom container holding the sample, image resolution is reduced when viewing the sample. To improve resolution, a sample container (100) is formed with a container body (110) having a bottom (120) with an aperture (125), a fluorinated ethylene propylene copolymer (FEP) film (150) attached to the bottom (120) to cover the aperture (125) to form a cavity-facing surface (155) on the film (150), and exposed to the liquid medium (210). Since the refractive index of FEP is close to that of water, image resolution is improved. Furthermore, the cavity-facing surface (155) is activated by plasma treatment to promote adhesion of the cavity-facing surface (155) to the biological sample (215) to enable cells in the biological sample (215) to proliferate in adherent cell culture and to immobilize the biological sample (215) during observation.

The invention discloses a water-pressure-resistant 8MPa fluorinated ethylene propylene insulated longitudinal watertight cable, which belongs to the technical field of cables, and comprises a cable main body, the cable main body adopts a fluorinated ethylene propylene insulating layer, a longitudinal watertight sheath is integrally formed on the outer layer of the cable main body, and a plurality of groups of limiting blocks are uniformly distributed on the outer side of the cable main body in the circumferential direction; a clamping groove matched with the clamping block for use is formed in the outer side of the cable main body in an extrusion manner; by arranging a linkage structure of a movable piece, an extrusion elastic piece, an air storage bag and a backflow block, self-adaptive adjustment of buoyancy along with water pressure is achieved, a mechanical linkage mechanism from water pressure driving to air circulation to finally achieve volume adjustment is formed, and in the laying and diving process, seawater pressure pushes the movable piece to extrude the elastic piece inwards, air in the air storage bag is pressed into the backflow block, and the buoyancy is adjusted. The volume of discharged liquid is increased, buoyancy is gradually increased, bounce and collision in a shallow water area are prevented, the whole structure does not need external power, dependence on a balancing weight and a floating bag is eliminated, and various damage problems caused by buoyancy unbalance in the prior art are solved.

The utility model belongs to the field of feeding devices, and particularly relates to a feeding device for production of fluorinated ethylene propylene resin, which comprises a bin, a discharge port is fixedly connected to the bottom of the bin, a bin cover is detachably mounted on the top of the bin, a motor is fixedly mounted in the middle of the upper end of the bin cover, and the motor is connected with the discharge port. An output shaft of the motor penetrates through the bin cover and is connected with the bin cover through a bearing, and the tail end of the output shaft is fixedly connected with a rotating shaft. The inclined plane seat supported by the spring is arranged at the discharge port of the stock bin, the plug is fixed at the bottom of the inclined plane seat through the sliding rod, the discharge port is plugged by the plug under the normal condition, and when the special-shaped rod on the rotating shaft does circular motion at the inclined plane of the inclined plane seat, the inclined plane seat can be lifted by matching with the elastic force of the spring; in this way, quantitative discharging can be achieved, and the situation that the discharging port is blocked due to the fact that the discharging amount is too large at the same time is avoided.

The invention belongs to the technical field of high polymer materials, and particularly discloses an anti-ultraviolet aging UV highlight blister film and a preparation method thereof. Comprising the following components in parts by weight: 100 parts of matrix resin, 16-22 parts of a plasticizer, 10-15 parts of an ethylene-vinyl acetate copolymer, 8-12 parts of modified needle-like wollastonite powder, 4-8 parts of POE (Polyolefin Elastomer) grafted glycidyl methacrylate, 2-4 parts of dioctyl adipate, 1-2 parts of a cross-linking agent, 1-2 parts of a stabilizer, 0.5-1.2 parts of a UV (Ultraviolet) absorbent, 0.8-2 parts of a photoinitiator and 0.4-1 part of an antioxidant. The matrix resin comprises polyvinyl chloride resin and fluorinated ethylene propylene in a mass ratio of (88-92): (8-12). The plastic uptake film disclosed by the invention has an excellent anti-ultraviolet aging effect.

The utility model relates to the technical field of copper-aluminum bars, in particular to a wrapping type copper-aluminum bar, which comprises a conductor, a protective layer is arranged on the outer side of the conductor, the protective layer comprises a polyimide composite film, a heat conducting layer and a waterproof layer which are arranged from inside to outside, the double surfaces of the polyimide composite film are coated with glue, and the glue is made of high-temperature-resistant resin. The high-temperature-resistant resin is fluorinated ethylene propylene resin, and the outer side of the conductor is provided with a fastening assembly. According to the utility model, through the arrangement of the polyimide composite film, the heat conduction layer and the waterproof layer, external water vapor, dust and other impurities are effectively prevented from invading, the heat dissipation effect is good, the insulation performance is ensured, and through the arrangement of the fastening ring, the fastening ring is made of a tungsten copper alloy ring, and the tungsten copper alloy has high strength and good conductivity, so that the service life is prolonged. On one hand, the mechanical strength of the conductor can be enhanced, so that the conductor is not easy to deform in the use process, and on the other hand, the conductivity of the conductor cannot be negatively influenced due to the conductivity of the conductor, so that the stability of power transmission is ensured.

The utility model relates to a light photovoltaic module, which relates to the photovoltaic field and comprises a transparent top layer, a bonding layer, a glass fiber buffer layer, a bonding layer, a battery layer, a bonding layer and a reinforcing backboard layer which are sequentially arranged. The transparent top layer comprises a polycarbonate layer, a polymethyl methacrylate layer, a fluorinated ethylene propylene copolymer layer or a polyethylene terephthalate layer; the bonding layer comprises an ethylene-vinyl acetate copolymer layer or a polyolefin elastomer layer. And the reinforced back plate layer comprises a polyvinyl fluoride, polyester film and polyvinyl formal back plate layer, a fiber reinforced polyamide back plate layer or a carbon fiber reinforced composite material back plate layer. According to the light photovoltaic assembly provided by the utility model, the light photovoltaic assembly is obtained by simplifying the design of the photovoltaic assembly of the existing sunlight shed and adopting the light high-strength material on the basis of ensuring the strength, so that the breakage rate and the safety coefficient of the product are greatly reduced, and the construction difficulty of the sunlight room is favorably reduced.

The invention relates to a flow synthesis process and synthesis equipment for graphene carbon nanoribbons, and the flow synthesis process comprises the following steps: taking a graphite plate as an anode and a nickel plate as a cathode, separating the anode from the cathode through a fluorinated ethylene propylene foil, and arranging a reaction channel on the fluorinated ethylene propylene foil; constant voltage is added between the anode and the cathode, DCM, TFA, a precursor biphenyl thiophene, an electrolyte tetrabutylammonium tetrafluoroborate and a medium DDQ are mixed to form a mixed solution, and the mixed solution is electrolyzed through the reaction channel; and after the reaction is completed, removing the organic phase, and concentrating and purifying the remaining solution to obtain a white powdery solid. The flow synthesis equipment comprises a controllable reaction interlayer, a reaction channel is dug in the middle of the controllable reaction interlayer, gas is filled between the upper fluorinated ethylene propylene foil and the lower fluorinated ethylene propylene foil, and the controllable reaction interlayer is clamped between the positive electrode holder and the negative electrode holder.

The invention relates to a dielectric fluid erosion-resistant server power supply module shockproof packaging structure and method, and the structure comprises an epoxy resin pouring sealant structure and / or a silica gel base fluid structure which are / is sequentially arranged in a server power supply module housing. The perfluoropolyether (PFPE) structure and / or the fluorinated ethylene propylene copolymer (FEP) structure are / is formed on the surface of the epoxy resin pouring sealant and / or the silica gel base liquid after the epoxy resin pouring sealant and / or the silica gel base liquid are / is cured. The packaging method comprises the following steps: filling the first base solution with epoxy resin pouring sealant and / or silica gel at the temperature of 10-15 DEG C and the pressure of 5-10 bar, uniformly mixing the first base solution with aluminum nitride (AlN) or aluminum oxide (Al2O3) nanoparticles subjected to surface modification by a fluorosilane coupling agent, and injecting the mixture into a power supply shell provided with a precise element; through a traditional double-layer structure design of epoxy resin, silica gel and perfluoropolyether (PFPE) and / or fluorinated ethylene propylene copolymer (FEP), and doping of the nanoparticles, a packaging composite scheme with corrosion resistance, shock resistance and excellent heat dissipation is formed.

The present application relates to the field of electromagnetic shielding layered material, and provides a transparent film for electromagnetic field shielding and a preparation method thereof, the film is a three-layer structure, sequentially comprising a polycarbonate / polyetherimide blended base layer, a shielding functional layer containing surface modified GO / ITO composite filler and a fluorinated ethylene propylene copolymer protective layer. The GO / ITO composite filler is composed of ITO nanorods loaded with graphene oxide and is modified by sodium benzoate, and has good dispersibility and conductivity. The filler content and additives in the functional layer are optimized to improve the electromagnetic shielding and mechanical properties, and the overall film has excellent transparency, strength and shielding effect. The preparation process includes melt extrusion of the base, solution coating and multi-stage temperature control curing of the functional layer, gravure coating of the protective layer and hot pressing and stretching shaping, and the prepared product is suitable for electromagnetic interference protection of high-performance electronic devices, the process is stable, and has good industrialization prospect.

The invention belongs to the technical field of lubricating materials, and discloses a micro-texture surface self-lubricating coating material and a preparation method and application thereof. The micro-texture surface self-lubricating coating material comprises a metal substrate, a micro-texture with an annular protrusion as a basic unit is machined on the surface of the metal substrate, and the surface of the metal substrate and the surface of the micro-texture are coated with a PTFE-MAX composite coating. The PTFE-MAX composite coating is formed by drying and curing a PTFE-MAX composite coating consisting of polytetrafluoroethylene, fluorinated ethylene propylene, Mo2Ga2C, a main solvent and an auxiliary solvent. According to the micro-texture surface self-lubricating coating material, through cross-scale cooperation of the bionic micro-texture and the PTFE-MAX composite coating, excellent antifriction and antiwear performance is achieved, and the micro-texture surface self-lubricating coating material can be applied to shaft system friction parts such as shaft sleeves and has good engineering popularization value.

Polymer-ceramic composite articles with relatively low dissipation factor (Df) and relatively high dielectric constant (Dk), as well as polymer-ceramic core-shell powders and pellets adapted for making such composite articles. The ceramic-polymer composites, in powder and / or pellet forms, comprise a plurality of core-shell particles, where: each of the core-shell particles comprises a core and a shell around the core; the core comprises a ceramic that is selected from the group of ceramics consisting of: BaTiO3, SrTiO3, TiO2, CaTiO3, MgTiO3, and combinations of any two or more thereof; and the shell comprises a polymer selected from the group of polymers consisting of: polyetherimide (PEI), polyetherimide (PEI) copolymers, polyphenylene ether (PPE), polyphenylene sulfide (PPS), polyaryl ether ketone (PAEK), polypropylene (PP), polytetrafluoroethylene (PTFE), perfluoroalkoxy alkane (PFA), fluorinated ethylene propylene (FEP), ethylene tetrafluoroethylene (ETFE), polyvinylidene fluoride (PVDF), and ethylene chlorotrifluoroethylene (ECTFE).