143 results about "Diphenyl ether" patented technology

The synthesis process comprises the following steps: (1) introducing inert gas into a reactor, adding a solvent, a Lewis acid catalyst and diphenyl ether, then dropwise adding an acyl chloride monomer solution, and synthesizing an intermediate M with a short-chain small molecular structure; (2) continuously dropwise adding an acyl chloride monomer solution into the reactor for reaction, and then adding an end-capping reagent for reaction; and (3) quenching, washing and drying the reaction product in the step (2) to obtain the product. Under the condition that only the Lewis acid is used as the catalyst, the one-pot method is adopted for synthesizing PEKK in two steps, side reactions can be reduced, meanwhile, the dosage of the catalyst is reduced, the production cost is reduced, the post-treatment process is simplified, and the obtained polyether ketone ketone is high in molecular weight and good in heat resistance and mechanical performance.

The invention discloses a preparation method of polyetherketoneketone, polyetherketoneketone and application. The method comprises the following steps: (1) mixing raw materials at a first temperature, the raw materials comprising acyl chloride, a solvent, Lewis base, diphenyl ether and Lewis acid, carrying out heat preservation, heating to a second temperature, and carrying out a first reaction stage; (2) heating to a third temperature for reaction, and carrying out a second reaction stage; (3) adding a terminator into the reaction mixture in the step (2); the heating rate in the step (1) and the heating rate in the step (2) are respectively and independently 0.1-5 DEG C / min, the weight-average molecular weight of the polyetherketoneketone prepared by the method is 5000-200000, and the molecular weight distribution coefficient is 2.5-4.5. The polyetherketoneketone with relatively narrow molecular weight distribution is obtained through an electrophilic substitution path.

The invention discloses a water treatment filtering material and a preparation method thereof, and relates to the technical field of water treatment. When the water treatment filtering material is prepared, alkaline lignin, epichlorohydrin and triethylenetetramine are subjected to a reaction through a reverse suspension cross-linking technology, and lignin porous microspheres are prepared; carrying out reaction on the lignin porous microspheres and picolinamide ligands to obtain modified lignin porous microspheres; 3-mercaptopropyltriethoxysilane and titanium dioxide are subjected to a reaction, and modified titanium dioxide is prepared; the preparation method comprises the following steps: reacting pyromellitic dianhydride, 1, 4-diaminobutylene and 4 ', 4-diaminodiphenyl ether to prepare functionalized polyamide; the functional polyamide, the modified lignin porous microspheres and the modified titanium dioxide are prepared into a spinning solution, and a polyamide membrane is prepared through electrostatic spinning; and carrying out liquid reaction on bromohexane on the polyamide membrane to obtain the water treatment filtering material. The prepared water treatment filtering material has excellent antibacterial property, heavy metal adsorption property, dye removal property and mechanical property.

The invention relates to a polyimide composite film for realizing high-dispersion carbon nanotubes through chemical anchoring and a preparation method of the polyimide composite film, which are used for solving the problems that carbon nanotubes in the existing carbon nanotube / polyimide composite material are easy to agglomerate, poor in interfacial compatibility and low in grafting efficiency. The preparation method comprises the following steps: S1, ultrasonically dispersing aminated carbon nanotubes in anhydrous dimethylacetamide to obtain a stable dispersion liquid; s2, slowly dropwise adding pyromellitic dianhydride into the stable dispersion liquid under an ice bath condition, and enabling the pyromellitic dianhydride to react with the aminated carbon nanotubes under the assistance of triethylamine to form anchor points; s3, adding a diamine monomer 4, 4 '-diaminodiphenyl ether, and gradually adding the residual pyromellitic dianhydride to carry out in-situ polymerization; and S4, preparing a wet film by adopting a curtain coating or spin coating method, and carrying out step-by-step thermal imidization at 80-300 DEG C to obtain the covalent composite film. Controllable covalent connection of the carbon nanotubes and pure polyimide chain segments can be achieved on the molecular level, and therefore the composite film with excellent heat conductivity, electromagnetic shielding performance and mechanical performance is obtained.

The application discloses a kind of temporary bonding glue and its application.Temporary bonding glue includes polyimide, the polyimide includes big conjugate unit, the conjugate atom number of big conjugate unit is greater than or equal to 40, and big conjugate unit includes at least one of diphenyl ether group, fluorenyl group or indane structural unit;The polyimide further includes at least one of benzotriazole group, nitro group.The application is improved on the structure of polyimide, and the temporary bonding glue is used in wafer processing, so that the absorbance of temporary bonding glue at target debonding wavelength 355nm is significantly increased, thereby significantly reducing threshold debonding energy, and it is expected to reduce the risk of wafer warping, cracking, or surface device failure, improve the life of laser and debonding efficiency.

The invention relates to the technical field of catalyst preparation, and discloses a carbon modified copper-based catalyst and a preparation method and application thereof. The method comprises the following steps: (1) sequentially carrying out coprecipitation and aging on an alkaline precipitant solution, a metal salt solution and an anion modifier solution to obtain an intermediate product I; and (2) under the condition that the oxygen concentration is not higher than 5% by volume, roasting the intermediate product I to obtain the carbon modified copper-based catalyst, the anion modifier solution contains sodium dodecyl diphenyl ether disulfonate and sodium gluconate in a molar ratio of 1: (1-10); the pH value of the anion modifier solution is 9-11; the metal salt solution contains zinc salt, copper salt and aluminum salt. The prepared carbon modified copper-based catalyst has the advantages of high conversion per pass of carbon dioxide, low activation temperature, high methanol selectivity, long-period operation and stable structure.

The application provides a porous carbon nanofiber electrocatalyst loaded with cobalt / lanthanum hydroxide heterojunction and a preparation method. The preparation method comprises the following steps: adding 4,4-diamino diphenyl ether and pyromellitic dianhydride into a solvent, uniformly mixing, and preparing a polyamide acid precursor spinning solution; electrospinning the prepared polyamide acid precursor spinning solution to prepare polyamide acid nanofibers; immersing the prepared polyamide acid nanofibers in a mixed metal salt solution containing cobalt salt, lanthanum salt and zinc salt to prepare polyamide acid nanofiber precursors loaded with metal ions; and performing programmed temperature heat treatment on the prepared polyamide acid nanofiber precursors loaded with metal ions in a protective atmosphere to prepare the porous carbon nanofiber electrocatalyst loaded with cobalt / lanthanum hydroxide heterojunction. The prepared porous carbon nanofiber electrocatalyst loaded with cobalt / lanthanum hydroxide heterojunction has excellent electrochemical oxygen reduction reaction and oxygen evolution reaction bifunctional catalytic activity.

The invention relates to a catalytic hydrolysis method of waste epoxy resin, which comprises the following steps: putting the waste epoxy resin into a reaction kettle, adding ultrapure water, adding a small amount of sodium dodecyl diphenyl ether disulfonate surfactant and a boron trifluoride acetic acid catalyst, and carrying out hydrolysis reaction to realize catalytic degradation of the epoxy resin. Degradation products can be converted into epoxy monomers and anhydride monomers, so that cyclic utilization is realized. Compared with the prior art, the degradation method provided by the invention is not only green and safe, but also high in degradation efficiency, solves the problem that the waste epoxy resin cannot be recycled, saves resources, meets the green development requirement, and has practical engineering application value.

The invention relates to the technical field of environmental remediation, and particularly provides a bifunctional copper-based coordination polymer photocatalyst as well as a preparation method and application thereof.The bifunctional copper-based coordination polymer photocatalyst is prepared from copper chloride dihydrate, 4, 4 '-bis (3-pyridinecarboxamide) diphenyl ether and benzoic acid as main raw materials by adjusting reaction parameters. And reacting in a hydrothermal kettle to generate the bifunctional copper-based coordination polymer photocatalyst {[Cu2 (3-padpe) 2Cl2]. H2O} n. The method has the characteristics of simple process, low cost, high catalyst activity, good stability, reusability and the like, shows good application potential in repairing water bodies and soil polluted by organic matters and heavy metals, and provides a new research thought and insight for development of a novel multifunctional environment repairing agent.

The present application relates to the technical field of aromatic polyamide polymer, in particular to a modified poly-p-phenyleneterephthalamide fiber with high elongation at break and a preparation method thereof.The present application introduces a small amount of 3,4'-diamino diphenyl ether and a fourth monomer containing a bis-amino phenoxy functional group during polymerization, and controls the molar ratio of the third monomer and the fourth monomer in the total amount of diamine monomer, thereby to a certain extent, the rigid molecular chain structure of the conventional p-aramid is destroyed, while the breaking strength of the fiber is maintained, the elongation at break of the polymer fiber is enhanced, the modified poly-p-phenyleneterephthalamide can still be prepared by dry spraying wet spinning process, the cost of building a new production line in the factory is saved, the process conditions and parameters are optimized, the fiber with stable elongation at break index is obtained, and the prepared fiber has an elongation at break of more than 3.6%.

The invention provides polyether sulphone and a preparation method thereof. The preparation method comprises the following steps: mixing a polar aprotic solvent, a bisphenol monomer and an alkaline substance, introducing protective gas, heating, dehydrating, cooling to T1, adding a diphenyl sulfone monomer, and carrying out heat preservation at T1 to carry out a first-stage polymerization reaction; adding a low-polarity solvent, heating to T2, and carrying out second-stage polymerization reaction to obtain polyether sulfone; wherein the low-polarity solvent is selected from one or a combination of more than two of normal hexane, cyclohexane, methylbenzene, ethylbenzene, biphenyl and diphenyl ether. By reducing or partially inhibiting the generation of the cyclic oligomer in the reaction process, the polyarylether sulfone with narrow molecular weight distribution and low content of the cyclic polymer is obtained. The method provided by the invention is simple and easy to implement, is convenient to control, avoids complex product purification and separation processes, and is beneficial to industrial implementation.

Disclosed in the present invention are an acrylate emulsion for a polymer cement waterproof coating, a raw material composition thereof, a preparation method therefor, and a use thereof. The raw material composition comprises the following components in parts by weight: 3-4.5 parts of sodium dodecyl diphenyl ether disulfonate, 1.5-2.5 parts of acrylamide, 2-4 parts of fatty alcohol polyoxyethylene ether, 2-4 parts of polyethylene glycol dimethacrylate, 1-2 parts of acrylic acid, 0.5-1 part of titanium triisostearoylisopropoxide, 40-60 parts of acrylate, 0.5-1 part of sodium persulfate, 50-60 parts of deionized water, and 0.1-0.3 parts of a 10% sodium hydroxide solution. The acrylate emulsion prepared by the present invention has excellent performance and good dispersibility, and a polymer cement waterproof coating prepared by using the emulsion of the present invention has lower viscosity and better workability.

The present invention provides a polyimide film comprising, as polymeric units, dianhydride monomers comprising pyromellitic dianhydride (PMDA), and diamine monomers comprising 4,4'-methylenedianiline (MDA), meta-phenylenediamine (MPD), 4,4'-diaminodiphenyl ether (ODA), and para-phenylenediamine (PPD), the tensile strength and percent elongation of the polyimide film being 180 MPa or greater and 90% or greater, respectively.

The invention discloses preparation and application of a double-sided aluminized polyimide film for ultralow-temperature multilayer vacuum insulation, and relates to the technical field of polyimide film preparation. The invention relates to an ultralow-temperature multilayer double-sided aluminized polyimide film for vacuum heat insulation, which consists of a polyimide base film and aluminized layers formed on two surfaces of the polyimide base film through a vacuum evaporation method, the polyimide base film is prepared from the following raw materials in parts by mass: 100 parts of pyromellitic dianhydride, 4, 4 '-diaminodiphenyl ether, 5-15 parts of a low-temperature-resistant modifier, 3-8 parts of nano silicon dioxide filler, 0.5-2 parts of a flatting agent, 0.5-1.5 parts of an anti-aging agent, 3-6 parts of a silane coupling agent and 5-15 parts of polyvinyl chloride. The anti-aging agent with a specific structure is adopted, the phenolic hydroxyl group and the benzotriazole structure have a synergistic effect, free radicals can be captured, ultraviolet rays can be absorbed, the compatibility with a polyimide matrix is good, precipitation at low temperature is avoided, the problems that a traditional anti-aging agent is poor in low-temperature dispersion and prone to failure are solved, and the service life of the film is prolonged.

This utility model discloses an apparatus for preparing 2,4,4'-trichloro-2'-nitrodiphenyl ether, relating to the technical field of 2,4,4'-trichloro-2'-nitrodiphenyl ether production apparatus. The inlet of the reaction vessel is connected via pipelines to a 2,4-dichlorophenol tank, a 2-nitro-4-chlorophenol tank, a sodium hydroxide tank, and an N,N-dimethylformamide tank. The outlet of the reaction vessel is connected via pipelines to an extraction tank. The inlet of the extraction tank is connected via pipelines to a deionized water tank and an ethyl acetate tank. The outlet of the extraction tank is connected via pipelines to an organic phase tank. The outlet of the organic phase tank is connected via pipelines to a drying tank. The inlet of the drying tank is connected via pipelines to an anhydrous sodium sulfate tank. The outlet of the drying tank is connected via pipelines to a vacuum distillation tank. The bottom outlet of the vacuum distillation tank is connected via pipelines to a product tank. The process is simple, and the product yield and purity are high.

The invention belongs to the technical field of preparation devices of 4, 4 '-dinitrodiphenyl ether, and particularly relates to a nitration device for producing 4, 4'-dinitrodiphenyl ether, which comprises a support frame, a tank body is rotatably connected to the support frame, a storage mechanism for storing and transporting reaction raw materials is fixedly connected to the upper end of the support frame, a reaction mechanism is fixedly connected to the interior of the tank body, and the reaction mechanism is fixedly connected to the lower end of the support frame. The input end of the reaction mechanism is connected with the output end of the storage mechanism through a pipeline, and a collecting structure is arranged at the output end of the reaction mechanism and used for collecting reaction products. The storage mechanism stores and stirs raw materials to prevent incomplete nitration reaction or side reaction increase caused by non-uniform local concentration of the raw materials, and when the raw materials are output into the reaction mechanism, the raw materials enter the reaction mechanism at a high speed, so that the raw materials collide at a high speed and are preliminarily mixed in the high-speed collision, and the reaction efficiency is improved. The subsequent reaction is more sufficient.

The invention relates to a wide-temperature-range high-moisture-resistance piezoelectric damping material and a preparation method thereof.The wide-temperature-range high-moisture-resistance piezoelectric damping material is prepared from, by weight, 80-90 parts of fluorine-containing modified polyimide precursor, 5-12 parts of MXene-CNT heterogeneous conductive filler, 3-8 parts of hydrophobic modified silicon dioxide and 0.3-1.5 parts of cross-linking agent; wherein the fluorine-containing modified polyimide precursor is prepared by copolymerization of 4, 4 '-diaminodiphenyl ether, pyromellitic dianhydride and 2, 2-bis (3-amino-4-hydroxyphenyl) hexafluoropropane, and the fluorine-containing modified polyimide precursor is prepared by copolymerization of 2, 2-bis (3-amino-4-hydroxyphenyl) hexafluoropropane; the hydrophobic modified silicon dioxide is obtained by modifying silicon dioxide through gamma-methacryloxy propyl trimethoxy silane; the cross-linking agent is trimesoyl chloride. The piezoelectric damping material disclosed by the invention is good in low-temperature toughness and has long-term stable moisture-proof performance.

The application discloses a kind of polyether ketone ketone and preparation method thereof, the application is first added terephthaloyl chloride or isophthaloyl chloride and diphenyl ether, then under the condition of adding catalyst anhydrous aluminium chloride, low-temperature prepolymerization for a certain time, then the remaining diphenyl ether is added to complete the short-chain end-capping reaction.The application reduces the temperature in the early stage of the starting reaction process and adopts the reflux method in the selection of the washing reagent in the later stage, so that the purity and molecular weight of the obtained high molecular polymer polyether ketone ketone are high.The content of aluminum, a catalyst contained in PEKK, is lower, and the intrinsic viscosity (molecular weight) and tensile strength of the tested product are higher.

The invention discloses automobile bearing lubricating grease and a preparation method thereof. The lubricating grease comprises the following components in percentage by mass: 70.5-80.5% of base oil; 13%-19% of a thickening agent; 6.5%-10.5% of an additive; wherein the base oil is alkyl diphenyl ether; the thickening agent is diurea and is prepared by reacting aniline, oleylamine and MDI; the additive comprises ammonium phosphonate and diethanol amine, and the ammonium phosphonate is ionic liquid. The bearing lubricating oil has excellent high-temperature resistance, oxidation resistance, water resistance, rust resistance and extreme pressure wear resistance and long service life, the phenomena of peeling, clamping stagnation, sintering and the like of a bearing are avoided after the bearing lubricating oil is used for a long time, the service life of the bearing is prolonged, and the occurrence rate of automobile faults is reduced.

This invention discloses polyimide, its preparation method, and polyester electronic adhesive. This invention provides a polyimide whose polymerizing monomers include dianhydride monomers and diamine monomers, wherein the dianhydride monomer is selected from one or more of 4,4'-(4,4'-isopropyldiphenoxy)bis(phthalic anhydride), 3,3',4,4'-benzophenone tetracarboxylic dianhydride, 4,4'-oxybis(phthalic anhydride), and 2,3,3',4'-biphenyltetracarboxylic dianhydride; and the diamine monomer is selected from one or more of aminophenyl sulfone, 1,3-bis(4'-aminophenoxy)benzene, 2,2'-bis[4-(4-aminophenoxyphenyl)]propane, 4,4'-bis(3-aminophenoxy)diphenyl sulfone, 1,3-cyclohexanedimethylamine, 4,4'-diaminodiphenyl ether, dimericadiamine, and trimericadiamine. The polyimide of this invention can modify polyester or epoxy systems, significantly improving flame retardancy and adhesive peel strength. The coating process involves evaporation at relatively low temperatures, and the solvent in the system has a low boiling point, meeting the requirements of existing processes.

The invention relates to the technical field of waste recycling, in particular to a harmless treatment and resource recycling method for bromine in bromine-containing waste, which comprises the following steps: putting the bromine-containing waste into a reaction solution, and heating for reaction to obtain debrominated waste and filtrate containing bromine ions; the reaction liquid comprises an alkaline substance, a copper compound precursor, a ligand and a solvent; the ligand is selected from at least one of a bidentate ligand containing two nitrogen sites, a polydentate ligand containing two nitrogen sites, a bidentate ligand containing two oxygen sites, a polydentate ligand containing two oxygen sites, a bidentate ligand containing one nitrogen and one oxygen site and a polydentate ligand containing one nitrogen and one oxygen site; the temperature of the heating reaction is not higher than 150 DEG C. The invention solves the problems of environmental pollution and bromine resource waste caused by organic bromine pollutants (such as highly toxic brominated dioxin) due to landfill, incineration and other traditional treatments after the brominated flame retardant (such as tetrabromobisphenol A, polybrominated diphenyl ether and the like)-containing plastic or resin is abandoned.

The application discloses a kind of reinforced toughened impact resistant wear-resistant anticorrosion integrated coating material and preparation method thereof, it is related to high polymer composite material and functional coating technical field, method includes: providing hexafluorocyclotriphosphazene and vanillin, mixing, carries out first reaction, obtains first reactant;Providing 4,4'-diamino diphenyl ether and 3,3',4,4'-benzophenone tetracarboxylic dianhydride, mixing, carries out second reaction, obtains second reactant;Providing hydroxyl-terminated polydimethylsiloxane and 4,4'-diphenyl methane diisocyanate, with second reactant is mixed, carries out third reaction, obtains third reactant;Providing iron salt, with first reactant and third reactant are mixed, carries out solidification treatment, obtains coating material;The reinforced toughened impact resistant wear-resistant anticorrosion integrated coating material obtained will be integrated in single layer coating with the functions such as reinforcement, toughening, impact resistance, wear resistance, corrosion resistance, etc., with excellent wear resistance and anticorrosion performance and intrinsic flame-retardant radiation resistance characteristics.

The application provides a resin sand casting method of a bridge housing casting, belongs to the casting technical field, and the casting method comprises casting and process design, mold and sand core manufacturing, closing and pouring preparation, smelting and pouring, cooling, sand falling and cleaning, heat treatment and finishing, and old sand regeneration. The casting resin sand comprises water-washed quartz sand, biomass modified furan resin, HTAM high-temperature-resistant and migration-resistant modifier, p-toluenesulfonic acid, aluminum dihydrogen phosphate, lactic acid, ammonium bicarbonate, polystyrene, expandable graphite, silane coupling agent, mica powder, calcined kaolin and spodumene powder. The biomass modified furan resin is prepared by the reaction of furfuryl alcohol, bio-based polyol, urea, phenol and p-toluenesulfonic acid and the addition of KH-550. The HTAM high-temperature-resistant and migration-resistant modifier is prepared by the reaction of KH-570 modified activated ceramic microbeads, pyromellitic dianhydride and 4,4'-diamino diphenyl ether and heat treatment.

The invention relates to a method for preparing 3, 4 '-diaminodiphenyl ether through efficient hydrogenation, and belongs to the technical field of fine chemical engineering. The method for preparing 3, 4 '-diaminodiphenyl ether comprises the following steps: dissolving 3-amino-4'-nitrodiphenyl ether in an organic solvent to obtain a to-be-hydrogenated liquid, adding the to-be-hydrogenated liquid and hydrogen into a multilayer tubular reactor for hydrogenation reaction to obtain a hydrogenated crude product liquid, then adding an alkaline substance, adding water for washing, and carrying out solid-liquid separation to obtain 3, 4 '-diaminodiphenyl ether, the multi-layer tubular reactor comprises a preheating dispersion layer, a catalyst layer and a filtering stable output layer from top to bottom; the preheating and dispersing layer comprises a coarse dispersing and preheating layer and a fine dispersing and preheating layer from top to bottom; the catalyst layer comprises a nitro activation catalyst layer and a side reaction inhibition catalyst layer from top to bottom; the filtering stable output layer comprises a filtering cooling layer and a stable output layer from top to bottom. The method is simple to operate and controllable in process, the production efficiency is improved, and the product purity and yield are improved.

This invention relates to the fields of compound synthesis technology and pesticide technology, specifically to natural naphthoquinone derivatives and their preparation methods and applications. The natural naphthoquinone derivatives are either natural naphthoquinone derivatives containing aryl carboxylic acids or natural naphthoquinone derivatives containing diphenyl ether units. Some of the natural naphthoquinone aryl carboxylic acid derivatives and natural naphthoquinone diphenyl ether derivatives of this invention exhibit 100% control efficacy against six weeds (barnyard grass, crabgrass, foxtail grass, velvetleaf, amaranth, purslane, etc.) at a dosage of 300 a.g. / ha. These compounds achieve good weed control effects at low dosages and have relatively good safety for crops such as corn, wheat, peanuts, soybeans, and cotton. They can be used as selective herbicides in agriculture. The compounds of this invention can be developed and used as potential PSII inhibitors and post-emergence herbicides for broadleaf weeds. The derivatives have simple structures and preparation processes, low production costs, and broad application prospects.

The application provides a low-yellowing fluorine-free semi-alicyclic polyimide composition and a preparation method thereof, and relates to the technical field of polyimide preparation.The semi-alicyclic polyimide composition is prepared by polymerization reaction of diamine and dianhydride; the diamine comprises first diamine and second diamine; the first diamine is 4,4'-diamino diphenyl ether-2,2'-disulfonic acid and / or 4-(4-aminophenoxy)-2,6-dimethyl aniline; the second diamine is 4,4'-diamino dicyclohexyl methane and / or 3,3'-dimethyl-4,4'-diamino dicyclohexyl methane; and the dianhydride is fluorine-free dianhydride. The semi-alicyclic polyimide composition prepared by the application significantly improves the optical performance of the polyimide film prepared therefrom, and the anti-yellowing effect is significantly improved.

The present disclosure relates to a herbicidal combination comprising a carbamate herbicide and a diphenyl ether herbicide.

The invention discloses a production method and application of polyetherketoneketone, and relates to the technical field of polymer synthesis. The production method of the polyetherketoneketone comprises the following steps: a method I: in an inert atmosphere, carrying out polymerization reaction on acyl chloride and diphenyl ether in the presence of Lewis base, Lewis acid and a reaction solvent for a period of time, adding a fluorine-containing end-capping reagent, and continuously reacting for 2-5 hours to obtain end-capped polyetherketoneketone; or the method II comprises the following steps: in an inert atmosphere, carrying out polymerization reaction on acyl chloride, diphenyl ether and a fluorine-containing end-capping reagent in the presence of Lewis base, Lewis acid and a reaction solvent to obtain the end-capped polyether ketone ketone. The fluorine-containing end-capping reagent is adopted for end capping of PEKK, so that the molecular weight and molecular weight distribution of PEKK are effectively controlled, the thermal stability and chemical inertness of the end group of PEKK are remarkably enhanced, and the hydrophobicity of PEKK is improved.

The present application relates to the technical field of high polymer materials, and particularly relates to a preparation method of wear-resistant / low-dielectric PTFE composite material based on interface functionalization. Ammonia / hydrogen mixed gas is used to perform low-temperature plasma treatment on PTFE powder; then the activated PTFE powder is dispersed in an aqueous solution containing ammonium perfluorooctanoate and 4-dimethylamino pyridine; then an organic phase of pyromellitic acid dichloride and an aqueous phase of 4,4'-diamino diphenyl ether are synchronously added dropwise to implement in-situ interface polymerization on the surface of PTFE particles to generate a polyamide acid ammonium salt coating layer; finally, through programmed temperature rising, the coating layer is converted into polyimide, and under the action of hot pressing, a composite material with PTFE as a matrix and a three-dimensional network of polyimide nanofibers penetrating through the inside is formed. The interface bonding force between the reinforcing phase and the PTFE matrix is significantly enhanced, so that the composite material simultaneously has excellent wear resistance, low dielectric constant, high mechanical strength and thermal stability.