2519 results about "Polyimide" patented technology

The invention belongs to the technical field of composite material design, and discloses a polyimide-based composite material design method and system based on experiment-machine learning collaborative optimization. The method comprises the following steps: S1, experimental database construction and machine learning performance modeling; S2, machine learning model construction and training; S3, model evaluation and performance index output; and S4, intelligent design of the polyimide-based composite material. The multi-objective performance collaborative optimization design and preparation of the polyimide-based ternary carbon heterostructure composite material are carried out by taking experimental data as a main material and machine learning as an auxiliary material. According to the method, an experiment-model-optimization closed-loop iterative design system is constructed based on an experiment-machine learning collaborative optimization method, the method has the advantages of high prediction precision, high optimization efficiency, good multi-target adaptability and the like, the development efficiency of the polyimide-based composite material is remarkably improved, and the development cost of the polyimide-based composite material is reduced. The method is suitable for intelligent design and large-scale application and popularization of the high-performance heat-conducting electromagnetic shielding material.

The invention discloses a lithium ion battery composite diaphragm, a preparation method and a lithium ion battery, and relates to the technical field of lithium ion batteries. The lithium ion battery composite diaphragm comprises a base membrane and a functional coating arranged on the negative electrode side of the base membrane, the functional coating sequentially comprises an ion conducting layer, a thermal barrier layer and a self-repairing layer from the position close to the base film to the position far away from the base film; wherein the base membrane is a polyimide and aramid nanofiber blended electrostatic spinning membrane; the ion conducting layer comprises a compound of a modified fast ion conductor and polyvinylidene fluoride-hexafluoropropylene; the thermal barrier layer comprises a cross-linked network of boron nitride nanosheets and polybenzimidazole; the self-repairing layer comprises polyurethane microspheres loaded with dynamic disulfide bonds. The composite diaphragm provided by the invention can remarkably inhibit a purple area on the surface of a negative electrode, and enhance high-temperature self-protection and interface self-repairing of the lithium ion battery, so that the cycle and safety performance of the lithium ion battery are remarkably improved.

The invention discloses a preparation method of a high-temperature-resistant high-strength polyimide composite material, and relates to the technical field of polyimide composites.The preparation method comprises the following preparation steps that S1, a customized silane coupling agent is prepared; s2, preparing a bionic dynamic interface modified reinforcing filler, wherein the modified reinforcing filler is synergistically modified through a bionic coating and a customized silane coupling agent; and S3, preparing a polyimide precursor solution containing the dynamic network. According to the preparation method of the high-temperature-resistant high-strength polyimide composite material, through the integrated design of'customized silane coupling agent + bionic dynamic interface modification + dynamic network-containing polyimide precursor + gradient hot-pressing curing ', the glass-transition temperature of the prepared composite material is greater than or equal to 335 DEG C, the tensile strength is greater than or equal to 208 MPa, and meanwhile, the thermal repair efficiency at 180-250 DEG C is greater than or equal to 87%; the technical bottleneck that high temperature resistance, mechanical strength and repairing performance of the material are difficult to consider at the same time in the prior art is solved.

The invention relates to a foam material, in particular to a polyimide / ionic liquid composite foam material and a preparation method thereof. The polyimide (PI) polymer with a rigid molecular structure and high temperature resistance is successfully synthesized, meanwhile, high-compatibility ionic liquid (ILs) molecules are introduced into adjacent PI molecular chains, the polyimide / ionic liquid composite foam material is formed through supercritical foaming, the foaming capacity is remarkably improved, and the polyimide / ionic liquid composite foam material has excellent performance.

The invention provides a liquid crystal aligning agent, a liquid crystal alignment film, a liquid crystal display element and a manufacturing method of the liquid crystal aligning agent. The liquid crystal aligning agent can obtain a liquid crystal alignment film which has excellent adhesion and can inhibit AC ghosting at a high level. A liquid crystal aligning agent containing a polymer component P containing one or more polymers, a compound C1, and a compound C2, the polymer component P containing at least one polymer p selected from the group consisting of polyimide precursors and polyimides that are imides of the polyimide precursors. Compound C1 is a compound having two or more structures represented by formula (c-1). The compound C2 is a compound represented by formula (c-2).

The invention provides a light and heat-dissipating aerospace small-sized calibration lamp mounting seat, which relates to the technical field of aerospace optical small-sized calibration lamp structure fixation, and comprises a substrate mounting seat module, a conductive module, an insulating module and a heat conduction module. The conductive module comprises two chamfered semi-cylindrical conductive copper blocks and two wires with soldering lugs; the insulating module comprises an insulating polyimide isolating layer; the heat conduction module comprises a heat conduction insulation pad which is installed above two copper blocks, the positive electrode and the negative electrode of the two copper blocks are separated through an insulation polytetrafluoroethylene isolation layer, and the semi-cylindrical conductive copper blocks, the polytetrafluoroethylene isolation layer and the substrate installation base are positioned through pin holes. The soldering lug wire is installed on the left semi-cylindrical conductive copper block and the right semi-cylindrical conductive copper block in a pressing mode through top screws. The structure distribution is friendly, the anti-seismic performance is good, a good heat dissipation way is provided for the calibration lamp, and an effective and feasible implementation scheme is provided for fixing the small aerospace calibration lamp.

The invention relates to the field of tension and pressure sensors, in particular to a tension and pressure sensor with a compensation function, which comprises an elastic body, a strain gauge, a compensation gauge and a wiring terminal, the strain gauge and the compensation gauge are respectively arranged on the surface of the elastic body, the strain gauge, the compensation gauge and the wiring terminal are electrically connected through a plurality of high-temperature-resistant cables to form a bridge circuit, at least the strain gauge and the compensation gauge are respectively limited in the first heat insulation layer and the protection layer, and the first heat insulation layer is located between the elastic body and the protection layer. At least a first heat insulation layer used for protection, heat insulation, pressure resistance and sealing is used for wrapping a strain gauge and a compensating gauge which are packaged by a polyimide film and can resist the high temperature of 260 DEG C, so that the actual temperature of the strain gauge and the compensating gauge has a remarkable temperature difference with the current environment temperature; the actual temperature of the strain gauge and the compensating gauge is obviously lower than the environment temperature, so that the strain gauge and the compensating gauge are respectively in an ideal temperature range, and the force measurement precision of the pull pressure sensor is ensured.

The invention relates to the technical field of thermal insulation materials, in particular to an aerogel felt and a preparation method thereof.The aerogel felt is composed of a composite fiber base material and multi-component aerogel loaded in the composite fiber base material, the composite fiber base material comprises 65%-75% of alkali-free glass fibers, 15%-20% of modified polyimide fibers, 4%-6% of nanoscale carbon fibers and 8%-12% of basalt fibers, and the multi-component aerogel is loaded in the composite fiber base material. According to the multi-component aerogel, 78%-82% of tetraethoxysilane, 12%-14% of methyltrimethoxysilane, 4%-6% of dimethyldimethoxysilane and 2%-4% of vinyltrimethoxysilane serve as precursors, 1.5%-2.5% of aluminum oxide, 0.8%-1.5% of titanium oxide nanoparticles and 3%-4% of zinc borate are added, a multi-stage reinforced structure is formed, the mechanical property and flexibility of the aerogel felt are remarkably improved, the tensile strength reaches 400 kPa or above, and the tensile strength reaches 400 kPa or above. The flexibility is excellent.

The invention belongs to the technical field of folding screens, and discloses an optical conductive film for a folding screen and a preparation method thereof.The optical conductive film for the folding screen comprises a composite base material, an interface transition layer, a gradient refractive index optical adjustment layer, a hybrid conductive layer and a scratch-resistant wear-resistant layer which are sequentially stacked from bottom to top; the composite base material is a blending modification layer of polyimide and transparent polyamide, the hybrid conductive layer is formed by compounding silver nanowires, a graphene sheet layer and PEDOT: PSS according to a preset proportion, and the refractive index of the gradient refractive index optical adjustment layer is gradually reduced in the direction away from the composite base material. And the difference value between the refractive index of the gradient refractive index optical adjustment layer and the refractive index of the hybrid conductive layer is not greater than 0.05. The mechanical stability, the light transmission efficiency, the conductive stability, the scratch resistance and the wear resistance of the film are improved, the performance is stable after folding circulation, the use requirements of a folding screen are met, and application in different scenes can be met.

A substrate-conveying support tape includes: a support film; a primer layer provided on the support film; and a temporary fixing material layer provided on the primer layer, in which the support film is a polyimide film, the temporary fixing material layer contains a thermoplastic resin, and the primer layer contains at least one selected from the group consisting of a silane coupling agent having an epoxy group or a ureido group, an epoxy resin, a polyurethane rubber, and an acrylic rubber having an acid value of 5 mgKOH / g or more.

The invention discloses metallized silver paste for improving sintering dusting of a TOPCon battery, a preparation method and application, and belongs to the technical field of solar battery manufacturing, and the technical scheme is that the metallized silver paste comprises the following components in percentage by mass: 72-87% of a metal phase; 3-9% of a glass phase; 8-12% of an organic carrier; 0.1%-0.5% of a polyimide precursor; 0.1 to 0.5 percent of cerium oxide; wherein the polyimide precursor forms a cross-linked network at a high temperature, the cerium oxide is used as a passivation layer protective agent, and lithium borosilicate glass is also added into the glass phase; according to the metalized silver paste for improving the sintering dusting of the TOPCon cell, the preparation method and the application, the dusting rate is reduced by improving and optimizing materials and process parameters, and compared with a traditional process, the efficiency, the photoelectric conversion efficiency and the yield of the solar cell are further improved.

The invention discloses a preparation method of a tinned copper core fluorinated ethylene propylene insulated cable for aerospace, and relates to the technical field of aerospace cable preparation methods. The preparation method comprises the following steps: S1, preparing a nickel-plated copper core; s2, preparing a heat insulation layer; s3, a composite insulating layer is prepared, the composite insulating layer is composed of a first insulating layer, a second insulating layer and a third insulating layer from inside to outside, the first insulating layer is a fluorinated ethylene propylene layer, the second insulating layer is a polyimide / fluorinated ethylene propylene composite layer, and the third insulating layer is a polyether-ether-ketone layer; s4, preparing a shielding layer; and S5, preparing a protective layer. The invention provides the preparation method of the tinned copper core fluorinated ethylene propylene insulated cable for aerospace, the insulated cable prepared by the preparation method has high performance and high reliability in an extreme aerospace environment, and all key requirements of electrical performance, radiation resistance, mechanical strength and wear resistance are comprehensively met.

The invention belongs to the field of photovoltaic modules, and discloses a perovskite crystalline silicon laminated photovoltaic module and a preparation method thereof.The photovoltaic module comprises front plate glass, and a top cell perovskite layer, a first adhesive film layer, a bottom cell crystalline silicon cell layer, a second adhesive film layer and back plate glass are sequentially laid on one side of the front plate glass; the edges of the top cell perovskite layer, the first adhesive film layer, the bottom cell crystalline silicon cell layer and the second adhesive film layer are wrapped and sealed through a composite frame, the composite frame comprises a substrate with the wall thickness of 0.1-2mm, the surface of the substrate is provided with an anodic oxide layer with the thickness of 4-6mu m, and the surface of the anodic oxide layer is covered with a polyimide layer with the thickness of 30-1mm. The laminated photovoltaic module adopts the composite frame to replace the existing butyl rubber for sealing, so that the metalized edge sealing is perfectly fused into the low-temperature laminating process, the sealing performance is superior to that of the butyl rubber, and the service life of the laminated photovoltaic module is prolonged.

One example includes a method for fabricating an integrated circuit (IC) device. The method includes fabricating a semiconductor die comprising a metal top (METTOP) structure and forming a barrier layer over the METTOP structure to cover approximately the entirety of the METTOP structure. The method also includes forming a polyimide (PI) layer over the semiconductor die and over a portion of the barrier layer to form a gap that exposes the barrier layer through the PI layer. The method further includes forming a conductive post in the gap over the barrier layer.

The invention relates to a large-breadth flexible damage sensing material and a preparation method thereof, belongs to the field of intelligent material preparation, and solves the problem that large-scale preparation of the large-breadth flexible damage sensing material is difficult in the prior art. The invention discloses a large-breadth flexible damage sensing material and a preparation method thereof. The large-breadth flexible damage sensing material comprises a flexible substrate layer, a conductive layer and a packaging layer, wherein the conductive layer is superposed on the flexible substrate layer; the packaging layer covers the conductive layer; the conductive layer is made of a laser-engraved polyimide film, a functional laser-induced graphene structure and an auxiliary separation structure which are etched by a laser engraving machine are arranged on the conductive layer, and the auxiliary separation structure comprises a film through hole and an edge cutting line; the large-breadth flexible damage sensing material provided by the invention is high in fineness, stable in performance and capable of meeting large-breadth sensing application, the preparation method of the large-breadth flexible damage sensing material is simple in step and high in preparation efficiency, and the large-breadth flexible damage sensing material which is stable in performance and high in fineness can be prepared in batches.

The invention discloses a protective adhesive film for sealing and testing a semiconductor and a preparation method of the protective adhesive film, and relates to the technical field of adhesives. The protective adhesive film is obtained by taking a modified acrylate monomer as a main body, taking a synthetic product of 2-hydroxypyridine and methacryloyl chloride as a modifier, taking trimethylolpropane triacrylate as a cross-linking agent and adding maleic anhydride modified modified chitosan and modified polyimide in a polymerization film forming process. The modified acrylate monomer is obtained by taking graphene oxide modified by vinyl trimethoxy silane and hollow glass beads modified by methacryloxy propyl trimethoxy silane as heat conducting fillers; the modified polyimide is obtained by adding a boron nitride nanosheet modified and acidified by amino acrylic acid as a heat-conducting reinforcing filler into a polyimide prepolymer and then carrying out imidization. The mechanical property, heat conduction efficiency and low-temperature brittleness of the protective adhesive film can be improved.

A composite wire suitable for use as a pacing or biostimulation lead has improved durability when compared to currently available materials. Specifically, a lead includes a superelastic wire including, e.g., nitinol. The wire is coated with polyimide and subsequently wound into a strand, cable, coil, or helically stranded tube. This wound structure is thermomechanically treated to shape-set the wire construct and retain a desired wound and shaped configuration, without adversely affecting the integrity of the polyimide coating.

The application relates to the field of chemical-proof fabrics, and particularly discloses a flame-retardant chemical-proof fabric and a preparation process thereof. The flame-retardant chemical-proof fabric comprises, from outside to inside, an outer layer, a bonding layer, a framework layer, a bonding layer and an inner layer which are sequentially contacted, the outer layer is a barrier layer, the inner layer is a barrier layer or an adsorption layer, the framework layer is selected from at least one of a composite fabric of aramid fiber / polyimide fiber, a basalt fiber cloth, a glass fiber cloth, a flame-retardant polyester cloth and a flame-retardant acrylic fiber cloth, the barrier layer is selected from at least one of a PVC / TPU composite film, a PVC film, a PTFE film, a PE film, silicone rubber, fluororubber, butyl rubber, chloroprene rubber and natural rubber, and the adsorption layer comprises a mixed fabric layer formed by nylon fiber and polyester fiber containing an adsorption material. The flame-retardant protective fabric has the advantages of high flame-retardant capacity, good chemical-proof effect, excellent puncture resistance and tensile resistance, can absorb moisture and sweat, and is comfortable to wear.

The invention discloses a graphene aerogel modified elastic graphite material and a preparation method thereof, and the graphene aerogel modified elastic graphite material comprises the following components by mass: 50-80 parts of crystalline flake graphite; 8 to 15 parts of graphene aerogel; 3 to 8 parts of aminated modified boron-doped carbon nanotubes; 2 to 6 parts of hydroxyapatite-cerium oxide composite nano particles; 1 to 4 parts of a polyimide-montmorillonite nano composite material; 0.5 to 3 parts of titanate coupling agent modified nano silicon dioxide; 1-3 parts of a dispersant; 2-5 parts of a binder; the amination modified boron-doped carbon nanotubes can enhance the electrical conductivity and interface bonding force of the material, the hydroxyapatite-cerium oxide composite nanoparticles improve the high-temperature stability and mechanical toughness of the material, and the polyimide-montmorillonite nanocomposite improves the corrosion resistance and resilience durability of the material. And the titanate coupling agent modified nano silicon dioxide further optimizes the dispersion uniformity of all the components, and the comprehensive performance of the material is remarkably improved.

The application discloses a preparation method of graphene aerogel and application thereof, and the graphene aerogel is prepared from a three-dimensional network of graphene oxide as a continuous matrix, hydrophilic polyimide fibers as a reinforcing framework, and metal-organic coordination bonds as functional nodes by coordinating cobalt ions with ethylenediamine tetramethylene phosphonic acid, and is prepared through a hydrothermal reaction, freeze drying and high-temperature annealing; the preparation method is simple, the process is easy to control, the electromagnetic shielding performance of the prepared graphene aerogel reaches 48 dB, and the graphene aerogel has good mechanical stability in the range of-75 to 150 DEG C; under a pressure of 1 kg, the compression time and recovery time of the graphene aerogel are 30 ms and 27 ms respectively, and the graphene aerogel meets the commercial standards of sensing materials and shielding materials.

Provided are: a resin composition comprising a photopolymerization initiator and a resin, which is a polyimide, having at least 0.30 mmol / g of a structure represented by formula (AA-1) and having a molar extinction coefficient of at most 1000 L·mol-1·cm-1 at a wavelength of 365 nm; a cured product obtained by curing the composition and a method for producing the cured product; a laminate comprising the cured product and a method for producing the laminate; a semiconductor device and a method for producing the semiconductor device; and a novel polyimide and compound.

The invention relates to the technical field of high-molecular polymers, and particularly discloses a polyimide adhesive for high-temperature adhesion as well as a preparation method and application of the polyimide adhesive. The polyimide adhesive is prepared from the following raw materials in parts by mole: a diamine compound with a polyhydroxy structure, a flexible dianhydride compound, an organic solvent, a dehydrating agent and a catalyst, the preparation method comprises the following steps: dissolving a diamine compound in an organic solvent, adding a dianhydride compound, reacting to generate a polyimide precursor, adding a dehydrating agent and a catalyst, and reacting to generate the polyimide adhesive. The polyimide adhesive for high-temperature bonding can be applied to bonding of metal materials, ceramic materials and glass materials, and has the advantages of high bonding force, excellent high-temperature resistance, better chemical stability and capability of resisting acid and alkali erosion.

The invention discloses a preparation method of polyimide aramid insulation paper with high tracking resistance. The prepared polyimide aramid insulation paper with high tracking resistance comprises two layers of aramid insulation paper and a layer of PI film, the aramid insulation paper is pressed on the two sides of the PI film respectively, and the PI film and the aramid insulation paper are bonded through an adhesive. According to the invention, firstly, the PI film is subjected to anti-tracking modification, and the anti-tracking performance of the composite insulation paper is effectively improved by compounding the PI film with the adhesive and the aramid insulation paper. The high-tracking-resistance polyimide aramid insulation paper prepared by the invention can be applied to the field of electrical equipment insulation.

The invention provides a self-healing-shape memory phase change microcapsule for cooling drilling fluid as well as a preparation method and application of the self-healing-shape memory phase change microcapsule, and belongs to the technical field of cooling of the drilling fluid and underground heat management. The preparation method of the phase change microcapsule comprises the following steps: fully dispersing a polyurethane prepolymer, a polyimide solution and hydrophobic nanocellulose in an organic solvent to obtain an oil phase; dissolving a phase change material in deionized water to obtain a water phase; under a shearing condition, dropwise adding the oil phase into the water phase, and emulsifying to form a stable oil-in-water type Pickering emulsion; and adding an aqueous solution of a chain extender, and carrying out interfacial polymerization reaction, centrifugation, washing and drying. The phase change microcapsule disclosed by the invention shows excellent cyclic service performance under the underground high-temperature and high-shear conditions, and structure repair and morphology recovery can still be realized by virtue of self-healing and shape memory effects even if a shell layer is damaged, so that the service life of the phase change microcapsule is prolonged, and the cooling persistence of the drilling fluid is improved.

The invention relates to a high-heat-resistance and high-insulation two-component epoxy resin adhesive and application thereof, and belongs to the technical field of epoxy resin. The technical problem to be solved by the invention is to provide the high-heat-resistance and high-insulation two-component epoxy resin adhesive. The adhesive comprises a component A and a component B. The component A comprises bisphenol A epoxy resin, novolac epoxy resin, silicon carbide whiskers, potassium titanate fibers, boron phenolic resin and modified nano boron nitride. The component B is prepared from methylhexahydrophthalic anhydride, methyl tetrahydrophthalic anhydride, 2-phenylimidazole, modified aluminum oxide, polyimide micro powder and modified wollastonite. Through synergism of multiple materials, balance of heat conduction, insulation, mechanical strength and thermal stability of the adhesive is realized. Under high-frequency pulse voltage, the adhesive is long in electrical aging life. A gradient curing process is adopted for curing, complete reaction in each stage is guaranteed, and internal stress is reduced. The process fault tolerance is high, the environment compatibility is high, the cost is low, and the curing time is short.

The application provides a mixed matrix membrane for efficient ion separation and a preparation method thereof, and belongs to the technical field of separation membranes.The application mixes an aluminum salt and sodium hydroxide in an organic solvent, then adds a heterocyclic organic ligand containing nitrogen to obtain a MOF precursor solution; adds polyimide into the MOF precursor solution to obtain a casting solution; pours the casting solution into a mold and performs vacuum heating, then performs peeling, soaks in ethanol, and then performs drying to obtain the mixed matrix membrane for efficient ion separation.The application realizes uniform dispersion of MOF-303 in the whole matrix by controlling the MOF loading, and constructs continuous ion channels by the uniformly dispersed MOF-303 crystal structure, so that the selectivity of the membrane to monovalent ions is further improved.The operation is simple, and the cost is low.

The invention discloses a sensor for detecting gas based on a two-dimensional material, and relates to the technical field of semiconductor sensors and battery safety. In order to solve the problems that an existing lithium ion battery management system lags in early warning and a traditional sensor is difficult to integrate and not resistant to corrosion, flexible polyimide is used as a substrate of the sensor, a back gate type two-dimensional material field effect transistor serves as a core, and a gate dielectric layer is arranged between a gate and a two-dimensional material channel in a spaced mode. A functional modification layer is arranged on the surface of the channel to improve the gas recognition specificity, a breathable hydrophobic layer covers one side deviating from the gate dielectric layer, and the breathable hydrophobic layer is matched with a passivation layer and a sensing window to form anti-corrosion packaging. The sensor can be implanted into a battery, real-time in-situ detection of ppb-level trace characteristic gas is realized through an adsorption-charge transfer-field effect amplification mechanism, and the sensor is linked with a BMS (Battery Management System) to realize ultra-early warning of thermal runaway. The device has the advantages of flexibility, easiness in integration, high sensitivity, corrosion resistance and long service life, and the safety management level of the battery is greatly improved.

The application discloses a kind of AuNPs@ polyimide SERS heating chip preparation and application method, through interface self-assembly technology preparation large-scale AuNPs array film, and transfer to the polyimide film with heating system, form AuNPs@ polyimide heating film as APHC for SERS chip, in situ heat enrichment is carried out to TNT molecule by APHC, and sample can be effectively collected from mixed system by simple operation.This flexible, heatable SERS chip has great significance for efficient, sensitive and in-situ detection of target molecules in complex environmental systems.

The invention belongs to the technical field of batteries, and particularly relates to an intelligent closed-pore composite diaphragm and a preparation method thereof, and a battery, the intelligent closed-pore composite diaphragm comprises a base membrane, a temperature-sensitive coating and a flame-retardant layer; the base film is provided with a first surface and a second surface which are oppositely arranged; the temperature-sensitive coating is arranged on the first surface of the base film; the temperature-sensitive coating comprises N-isopropylacrylamide-co-acrylic acid, polyvinylidene fluoride and aluminum oxide, and the N-isopropylacrylamide-co-acrylic acid is formed by cross-linking polymerization of N-isopropylacrylamide and acrylic acid; the flame-retardant layer is arranged on the second surface of the base film; the composite diaphragm realizes dynamic reversible hole closing along with temperature change. Compared with the prior art, the core defect that in the prior art, a passive flame-retardant material cannot dynamically respond to thermal runaway is overcome. According to the scheme, the polyimide base film and the temperature-sensitive coating are designed, and the flame-retardant layer is combined, so that precise regulation and control of the hole closing temperature, dynamic reversible hole closing and intrinsic flame retardance are realized, the high-temperature safety of the lithium battery is remarkably improved, and the cycle life of the lithium battery is remarkably prolonged.

The invention relates to the technical field of papermaking, in particular to a preparation method of high-definition electronic screen protection paper. According to the method, regenerated cellulose fibers serve as main raw materials, functional composite fibers of a core-shell structure are constructed, a core layer is the regenerated cellulose fibers, a shell layer is a polypyrrole / graphene composite conductive layer, and the lasting antistatic performance is achieved; meanwhile, the surface-modified nano silicon dioxide aerogel particles are introduced, so that the optical performance and the mechanical strength are improved; then compounding with polyimide fibers modified by a silane coupling agent, adding a bio-based wet strength agent and a fluorocarbon defoaming agent, and carrying out the steps of plasma pretreatment, pulping, on-net papermaking, controllable drying, magnetron sputtering surface treatment and the like to prepare the protective paper. The obtained protective paper has the characteristics of being ultrathin, high in strength, high in light transmittance, lasting in antistatic property and the like, and is suitable for protection of high-end liquid crystal display screens and OLED screens.