73 results about "Diphenyl Oxides" patented technology

The invention discloses a shielding protection adhesive tape for semiconductor integrated circuit packaging and a preparation method thereof, and relates to the technical field of semiconductor integrated circuit packaging. The shielding protective adhesive tape for packaging the semiconductor integrated circuit is prepared by taking polyimide as a base material and coating a coating, and the coating comprises the following raw materials in parts by weight: 3-5 parts of modified nano silicon dioxide, 30-40 parts of N, N-dimethylformamide, 1-3 parts of a curing agent and 1-3 parts of a curing agent. The invention discloses a high-temperature-resistant epoxy resin coating which is prepared from the following components in parts by weight: 25-30 parts of N, N-dimethylformamide, 25-30 parts of a modified acrylate copolymer, 17-26 parts of ethyl acetate, 12-15 parts of epoxy resin, 1-2 parts of a silane coupling agent KH-550, 0.5-1 part of an antioxidant 1010, 0.3-0.8 part of an ultraviolet absorbent UV-327, 1-2 parts of carboxyl-terminated nitrile rubber, 2-4 parts of decabromodiphenyl ether, 0.1-0.3 part of an organic siloxane defoaming agent, 0.2-0.5 part of an acrylate flatting agent and 10-11 parts of diaminodiphenyl sulfone. The adhesive tape contains the modified nano silicon dioxide, the modified acrylate copolymer and other components, so that the performance of the adhesive tape is guaranteed; pretreatment is meticulous, preparation steps are standard, and mass production is easy; a finished product can be effectively shielded, and the packaging yield and the product stability can be improved.

The invention discloses a polyetherketoneketone high-temperature-resistant wear-resistant non-stick coating and a preparation method thereof. The coating is prepared from the following components in parts by mass: 13 to 30 parts of a resin matrix group (containing 12 to 25 parts of titanium modified polyether ketone ketone resin, 1 to 5 parts of fluorine-free viscous resin and 0.65 to 6 parts of aluminum oxide), 0.5 to 3 parts of a nano reinforced group (containing 0.5 to 3 parts of KH-550 modified nano titanium dioxide, 0.025 to 0.6 part of cerium dioxide and 0.5 to 3 parts of boron nitride) and 62 to 71 parts of an auxiliary agent group. The preparation method comprises the following steps: 1) taking diphenyl ether, paraphthaloyl chloride and isophthaloyl chloride as monomers, and synthesizing titanium modified polyether ketone ketone resins with different viscosities through segmented polymerization (1.5-2.0 hours or 3.0-4.0 hours); 2) respectively preparing a smooth bottom layer water dispersion slurry and a wrinkled surface layer water dispersion slurry; and (3) forming a compact bottom layer and a micro-wrinkle surface layer on the base material by adopting a layered spraying and stepped sintering process (280-320 DEG C, 10-20 minutes). The whole system of the coating is fluorine-free and has temperature resistance gt; the coating has the characteristics of high temperature resistance (350DEG C), wear resistance (Taber wear rate of 3-5mg / 1000r), non-sticking (contact angle gt, 100 DEG C) and heavy corrosion resistance, and is suitable for cooking utensils and chemical equipment.

This anticorrosive coating composition comprises a main agent (I) and a curing agent (II), wherein: the main agent (I) contains an epoxy resin (a); the epoxy resin (a) contains at least one of a bisphenol A epoxy resin (a-11) and a novolac epoxy resin (a-12) each having a weight average molecular weight of 6,000-12,000; the curing agent (II) contains a polyamine (b) and an alkylphenol (c); the polyamine (b) contains an alicyclic polyamine (b-1) having a cyclic aliphatic hydrocarbon group to which an amino group is bonded and contains a non-alicyclic polyamine (b-2) having no cyclic aliphatic hydrocarbon group to which an amino group is bonded; at least one of the main agent (I) and the curing agent (II) includes a vinyl-based defoaming agent (d) that has a constituent unit derived from at least one monomer selected from the group consisting of alkyl (meth)acrylates, alkyl vinyl ethers, and olefins and that has a number average molecular weight of 30,000-100,000 or 300,000-2,000,000; the content of the alicyclic polyamine (b-1) is 30%-80% by mass of the solid content of the curing agent (II); the content of the non-alicyclic polyamine (b-2) is 2%-45% by mass of the solid content of the curing agent (II); the content of the alkylphenol (c) is 5%-60% by mass of the solid content of the curing agent (II); and the content of the vinyl-based defoaming agent (d) is 0.005-3 parts by mass with respect to 100 parts by mass of the anticorrosive coating composition.

This invention relates to a method for synthesizing iron-cobalt alloy-doped carbon nanofibers for electrocatalysis using zinc oxide etching, belonging to the technical field of electrode materials and catalysts. The preparation method includes the following steps: 1) mixing DMF (dimethylformamide), PMDA (pyromellitic dianhydride), and ODA (4,4-diaminodiphenyl ether) in a certain proportion to prepare a PAA (polyamic acid) spinning solution; 2) preparing PAA nanofibers from the PAA spinning solution using an electrostatic melt-blowing device; 3) imidizing the PAA nanofibers using a programmed temperature rise method to obtain PI nanofibers; 4) impregnating the PI nanofibers in a salt solution; 5) carbonizing the impregnated PI nanofibers with a large number of metal ions on their surface in an inert atmosphere using a certain temperature rise program to obtain iron-cobalt alloy-doped carbon nanofibers. The iron-cobalt alloy-doped carbon nanofibers prepared by this method exhibit excellent performance as an ORR / OER bifunctional electrocatalyst and have wide applications.

The invention discloses a preparation method of a polyimide-boron nitride nanosheet heat-conducting composite film. The preparation method comprises the following steps: firstly, dispersing boron nitride nanosheets into N, N-dimethylacetamide containing poly (diallyldimethylammonium chloride) to prepare slurry; meanwhile, 4, 4 '-diaminodiphenyl ether reacts with pyromellitic dianhydride to prepare a polyamide acid solution. And mixing the two materials, forming a layered structure through vertical and horizontal temperature gradients by adopting a bidirectional freezing casting technology, and freezing by liquid nitrogen to obtain the aerogel in oriented arrangement. And performing hot pressing and step-by-step thermal imidization treatment to obtain the heat-conducting composite film. According to the method, the highly-oriented arrangement of boron nitride nanosheets is constructed through bidirectional freezing casting, and the composite film has excellent heat-conducting property and keeps good mechanical strength and flexibility in combination with the surface modification effect. The process is simple and controllable, and is suitable for the fields of flexible electronics, 5G heat dissipation, battery thermal management and the like.

The invention discloses a light-emitting diode packaging material and a preparation method thereof, and relates to the technical field of light-emitting diodes. The method comprises the following steps: adding 4, 4 '-diaminodiphenyl ether into pyromellitic dianhydride for condensation polymerization to obtain a polyamic acid solution, and adding zinc borate nanowires and aluminum nitride powder to prepare an inorganic skeleton enhanced polyamic acid suspension; the preparation method comprises the following steps: reacting zirconium hydroxide sol with an aluminum sec-butoxide solution, and carrying out hydrothermal reaction and high-temperature calcination to obtain ZrO2at-alpha-Al2O3 core-shell particles; the preparation method comprises the following steps: pre-polymerizing 4, 4 '-diphenylmethane bismaleimide and bisphenol A cyanate ester to obtain a prepolymer; the preparation method comprises the following steps: mixing bisphenol A type epoxy resin, inorganic skeleton reinforced polyamide acid suspension, ZrO2at-alpha-Al2O3 core-shell particles and a prepolymer under vacuum, defoaming, injecting into a mold, heating, curing, cooling and demolding to obtain the product. Through the synergistic effect of triple modification, the high temperature resistance and lasting thermal stability of the packaging material are improved, and the packaging material is suitable for the field of light emitting diode packaging with high temperature resistance requirements.

The invention provides a plastic film for packaging a medical non-woven fabric and a preparation method of the plastic film. The plastic film comprises a polyimide layer, an ethylene-vinyl alcohol copolymer layer and a polypropylene layer from outside to inside, the polyimide layer is prepared from the following raw materials: 4, 4-diaminodiphenyl ether, pyromellitic dianhydride, a polyimide coated nano titanium dioxide / tetrapod-like zinc oxide whisker composite material and modified diatomite; the polyimide layer in the plastic film has excellent steam sterilization resistance and good radiation resistance, and after the polyimide layer is matched with the ethylene-vinyl alcohol copolymer layer and the polypropylene layer, the plastic film not only has excellent gas and microorganism barrier properties, but also can adapt to the modes of high-temperature steam sterilization, gamma ray irradiation sterilization and the like; the high mechanical property is kept for a long time, and the risk of damage caused by external force is reduced.

The invention discloses a fireproof flame-retardant battery diaphragm, a preparation method thereof and a fireproof flame-retardant battery, and relates to the technical field of battery diaphragms. When the fireproof flame-retardant battery diaphragm is prepared, boric acid diglyceride and chlorinated trimellitic anhydride mixed liquor react to prepare a flame-retardant monomer; the preparation method comprises the following steps: polymerizing 4, 4 '-diaminodiphenyl ether and a flame-retardant monomer, and carrying out electrostatic spraying to prepare polyamide acid microspheres; dehydrating and drying the polyamide acid microspheres to obtain polyimide microspheres; performing etching-acidification on the polyimide microspheres to prepare carboxylated polyimide microspheres; allyl phosphoric acid and acrylic acid are copolymerized and grafted on the surface of a polyethylene film to prepare a modified polyethylene film; and coating the surface of the modified polyethylene film with the carboxylated polyimide microspheres to prepare the fireproof flame-retardant battery diaphragm. The prepared fireproof flame-retardant battery diaphragm has excellent flame retardance, wetting performance and thermal stability.

The application discloses a preparation method and application of fluorine-containing cross-linkable polyimide-based carbon molecular sieve membrane and belongs to the technical field of gas separation membranes. 4,4'-(hexafluoroisopropyl) diphthalic anhydride is used as a dianhydride monomer, 3,5'-diaminobenzoic acid and 4,4'-diamino diphenyl ether are used as common diamine monomers to copolymerize a polyamide acid solution; the polyamide acid solution is prepared into a casting solution, and after standing and defoaming, a polyamide acid membrane is prepared by using a coating method, and the polyamide acid membrane is imidized to prepare a polyimide membrane; the polyimide membrane is used as a polymer precursor membrane of the carbon molecular sieve membrane, is placed in a programmed temperature carbonization furnace with a protective atmosphere and is high-temperature baked to obtain the fluorine-containing cross-linkable polyimide-based carbon molecular sieve membrane. The carbon molecular sieve membrane is not only easy to prepare but also excellent in anti-aging capacity; the carbon molecular sieve membrane is used for CO2 / N2 and CO2 / CH4 separation, and has a high CO2 permeation coefficient and CO2 / N2 and CO2 / CH4 separation factors.

The invention discloses a flame-retardant heat-insulating aluminum foil reinforced composite material and a preparation method thereof, and belongs to the technical field of aluminum foil reinforced composite materials. The flame-retardant heat-insulating aluminum foil reinforced composite material prepared by the invention sequentially comprises an aluminum foil layer, a reinforced net, kraft paper and a flame-retardant adhesive layer for bonding the aluminum foil layer and the reinforced net and bonding the reinforced net and the kraft paper from bottom to top, the flame-retardant adhesive layer comprises the following raw material components: a dianhydride monomer, an amine monomer and a heat-insulating filler; the amine monomer comprises 4, 4 '-diaminodiphenyl ether, flame-retardant diaminobenzimidazole and 4-aminobenzonitrile, the heat-insulating filler is prepared from hydroxyapatite nanowires, montmorillonite nanosheets and aminated polyvinyl alcohol, and the flame-retardant heat-insulating aluminum foil reinforced composite material prepared by the preparation method disclosed by the invention is relatively good in flame retardance and heat insulation.

The invention discloses a flame-retardant fireproof hose and a preparation method thereof, and relates to the technical field of flame-retardant fireproof materials. The invention discloses a flame-retardant fireproof hose. The flame-retardant rubber material is prepared from the following raw materials in parts by weight: 60 to 80 parts of ethylene propylene diene monomer, 20 to 30 parts of chlorinated polyethylene, 5 to 12 parts of dioctyl phthalate, 1 to 3 parts of stearic acid, 40 to 60 parts of modified magnesium hydroxide, 5 to 10 parts of antimony trioxide, 2 to 5 parts of nano silicon dioxide, 8 to 15 parts of decabromodiphenyl ether, 3 to 8 parts of carbon black, 15 to 25 parts of modified glass fiber and 1.5 to 3 parts of dicumyl peroxide. And sufficient polyvinyl chloride flame-retardant coating is provided. The flame-retardant fireproof hose is scientific in raw material ratio, the ethylene propylene diene monomer and the chlorinated polyethylene synergistically improve the toughness of a matrix, and the modified magnesium hydroxide and the modified glass fibers enhance the flame retardance and mechanical properties; the preparation process is rigorous, uniform dispersion of the filler is ensured through multi-step modification, and vulcanization and spraying parameters are accurate and controllable; the product is excellent in flame retardance, high in process reproducibility, suitable for large-scale production and capable of meeting the fireproof requirements of various scenes.

The invention discloses a flexible cable material for a robot and a preparation method of the flexible cable material, and relates to the technical field of cable materials. Comprising the following raw materials in parts by weight: 60-80 parts of fluorosilicone thermoplastic polyurethane elastomer, 15-25 parts of polyamide thermoplastic elastomer, 3-5 parts of compatilizer, 5-8 parts of environment-friendly plasticizer, 0.8-1.2 parts of antioxidant, 0.5-0.8 part of lubricant, 1-2 parts of light stabilizer, 3-5 parts of coupling agent, 25-30 parts of filler, 3-5 parts of 4, 4 '-diacyl chloride diphenyl ether, 1-3 parts of catalyst and 4-6 parts of cross-linking agent. The filler is formed by mixing graphene oxide quantum dots, nano titanium dioxide, an aluminum hydroxide flame retardant VK-LA50 and carbon nanotubes according to the mass ratio of 1: (0.8-1.2): (3-5): 1. The material is sufficient in flexibility, good in tensile property and weather resistance, good in durability and long in service life.

The invention discloses an immersion plating method for a nano-palladium layer on the surface of a bonded oxygen-free copper wire and a palladium-plated bonded oxygen-free copper wire. Relates to the technical field of palladium-plated copper wires. According to the dip plating method for the nano-palladium layer on the surface of the bonded oxygen-free copper wire, the bonded oxygen-free copper wire is soaked in ethyl alcohol to be cleaned and dried for standby application; the preparation method comprises the following steps: dissolving a surfactant, benzotriazole and rosin in an organic solution; adding nano palladium powder to obtain a dip plating solution; carrying out dip plating treatment on the bonded oxygen-free copper wire in the dip plating solution, drying after dip plating, and carrying out vacuum annealing; the surfactant is prepared from methyl amyl alcohol, trimethylsilyl glucoside, sodium dodecyl diphenyl ether disulfonate, a carbon nano tube and deionized water. The surface active agent is added, so that nano palladium particles can be uniformly dispersed in the plating solution, the palladium particles are prevented from being agglomerated, a more uniform and compact palladium plating layer can be obtained, the quality of the plating layer is improved, and the corrosion resistance is better.

The invention discloses a double-sided glass magnesium rock wool manual purification board and a preparation method thereof, belonging to the technical field of manual purification board preparation. The double-sided glass magnesium rock wool manual purification board is composed of the following components in parts by weight: 20-30 parts of modified rock wool, 30-50 parts of glass magnesium board, 10-13 parts of adhesive, and 6-9 parts of modified hydrophobic coating. Among them, the modified rock wool is prepared from 4,4'-diaminodiphenyl ether, pyromellitic dianhydride, zirconium oxychloride octahydrate, rock wool substrate and diatomite, and the modified hydrophobic agent is prepared from octafluoropentanol, isophorone diisocyanate 、 3-aminopropene, polyethylene glycol dimethacrylate and acrylic acid. The double-sided glass magnesium rock wool manual purification board prepared by this method has excellent moisture-proof performance, fire resistance and mechanical properties.

The invention relates to a high-wear-resistance modified phenolic resin material for a guide ring and a preparation process thereof. The high-wear-resistance modified phenolic resin material for the guide ring is prepared from the following raw materials in parts by mass: 100 parts of linear phenolic resin, 20-35 parts of a polyimide prepolymer, 20-45 parts of a reinforcement, 10-25 parts of a wear-resistant filler, 1-3 parts of a silane coupling agent and 8-12 parts of a curing agent, the polyimide prepolymer is prepared by reacting pyromellitic dianhydride with 4, 4 '-diaminodiphenyl ether. The high-wear-resistance modified phenolic resin material for the guide ring, prepared by the invention, has excellent high-temperature wear resistance.

The application provides a wear-resistant enameled copper wire and a preparation method thereof, and belongs to the technical field of enameled copper wires.The preparation method comprises the following steps: repeatedly coating wear-resistant paint on a copper wire and curing the wear-resistant paint into a paint film, and then cooling and winding the copper wire to obtain the wear-resistant enameled copper wire.The preparation method of the wear-resistant paint comprises the following steps: adding 4,4'-diamino-4"-hydroxytriphenylmethane and 2,2-bis-[4-(4-aminophenoxy)phenyl]propane into a polymerization bottle, adding N,N-dimethylacetamide, stirring and dissolving, adding 3,3',4,4'-benzophenonetetracarboxylic dianhydride, stirring and polymerizing, and obtaining a polyamic acid solution one; adding 4,4'-diamino diphenyl ether into the polymerization bottle, adding N,N-dimethylacetamide, stirring and dissolving, adding pyromellitic dianhydride, stirring and polymerizing, and obtaining a polyamic acid solution two; adding the polyamic acid solution one and the polyamic acid solution two into the polymerization bottle, adding a silane coupling agent, stirring, adding N,N-dimethylacetamide and a peroxide initiator, and stirring uniformly to obtain the wear-resistant paint; and the wear resistance of the wear-resistant enameled copper wire can be effectively improved.

The invention discloses a production method of a flame-retardant BOPET optical base film. The base film comprises an outer surface layer, a middle core layer and an inner surface layer, the outer surface layer is PET (Polyethylene Terephthalate); the middle core layer is composed of PET, GF, decabromodiphenyl ether, an antioxidant and phenylphosphonic acid cerium; and the inner surface layer is composed of PET, PEN and nano silicon dioxide. The PEN of the inner surface layer has more excellent mechanical and heat-resistant properties and can enhance PET, and the middle core layer uses decabromodiphenyl ether and cerium phenylphosphonate together for the PET / GF composite material, so that the flame retardant property of the composite material can be greatly improved.

The invention relates to the field of copper clad laminates and specifically discloses a low-dielectric epoxy resin for copper clad laminates and a processing technology thereof. The low-dielectric epoxy resin for copper clad laminates comprises a component A and a component B. Component A comprises the following raw materials, calculated in parts by mass: 100-150 parts of acetone, 250-300 parts of bisphenol A epoxy resin, and 50-100 parts of low-dielectric fillers; component B comprises the following raw materials, calculated in parts by mass: 150-250 parts of a low-dielectric curing agent, 20-30 parts of a curing agent, and 10-20 parts of a curing accelerator. The preparation of the low-dielectric curing agent comprises the following steps: taking a diamine modifier, 4,4'-diaminodiphenyl ether, 4,4'-oxydiphthalic anhydride, and meta-cresol, stirring under nitrogen protection, adding isoquinoline, stirring, cooling, adding meta-cresol, discharging the material while hot into ethanol, washing, filtering, extracting to remove the meta-cresol, and vacuum drying to obtain the low-dielectric curing agent.

The invention discloses a PES net film for an automobile door panel and a preparation method of the PES net film, and relates to the technical field of automobile interior materials. The invention discloses a PES net film for an automobile door panel. The modified PES copolymerized polyether sulfone material is prepared from the following raw materials in parts by weight: 20 to 30 parts of modified PES copolymerized polyether sulfone, 10 to 15 parts of ethylene-vinyl acetate copolymer, 8 to 12 parts of linear low-density polyethylene, 5 to 8 parts of butadiene styrene rubber, 3 to 6 parts of modified nano silicon dioxide, 2 to 4 parts of mica powder, 3 to 5 parts of decabromodiphenyl ether, 0.5 to 1 part of antioxidant 1010, 0.3 to 0.6 part of phenyl salicylate, 0.2 to 0.4 part of zinc stearate and 0.3 to 0.5 part of silane coupling agent KH-550. 5 to 8 parts of epoxidized soybean oil, 0.5 to 1 part of sodium benzoate and 0.1 to 0.3 part of graphene. The PES net film for the automobile door panel has remarkable advantages. In the aspect of raw materials, PES copolymerized polyethersulfone and nano silicon dioxide are modified in multiple steps and are cooperated with multiple auxiliaries. And in the process, conditions of each step are accurate, and the reaction and mixing effects are guaranteed. In the product structure, all the components are tightly interwoven, the net film is endowed with excellent flexibility, adhesion, flame retardance and the like, the comprehensive performance is excellent, and the net film is suitable for manufacturing automobile door panels.

The invention provides porous carbon, a silicon-carbon negative electrode material and a preparation method thereof, and the preparation method of the porous carbon comprises the following steps: providing a mixture comprising first resin, a flame retardant and a defoaming agent, dissolving the mixture in a first organic solvent, and carrying out spray drying to prepare a granular precursor, the flame retardant comprises at least one of decabromodiphenyl ethane, decabromodiphenyl ether, octabromodiphenyl ether, pentabromodiphenyl ether, tetrabromobisphenol A and hexabromocyclododecane, and at least one of decabromodiphenyl ether, octabromodiphenyl ether, pentabromodiphenyl ether, tetrabromobisphenol A and hexabromocyclododecane; carrying out carbonization treatment on the granular precursor to form a carbonization treatment product; and carrying out activating treatment on the carbonization treatment product to form the porous carbon.

The invention belongs to the technical field of electromagnetic wires, and particularly relates to a polyether-ether-ketone electromagnetic wire and a preparation method thereof. The electromagnetic wire provided by the invention comprises a copper conductor, wherein the copper conductor is sequentially coated with an insulating layer A and an insulating layer B from inside to outside; the raw materials of the insulating layer A comprise a diphenyl ether monomer and terephthaloyl chloride, and the diphenyl ether monomer comprises 4, 4 '-diphenoxy diphenyl sulfone; and the raw materials of the insulating layer B comprise fluororesin and polyether-ether-ketone. According to the polyether-ether-ketone electromagnetic wire, the adhesiveness of the insulating layer and the copper conductor is remarkably improved, the falling or cracking risk of the insulating layer is effectively reduced, meanwhile, the electromagnetic wire has excellent insulating performance, and the polyether-ether-ketone electromagnetic wire is particularly suitable for high-frequency and high-voltage application scenes.

The invention belongs to the technical field of sintering lines, and particularly relates to a thin film sintering line and a preparation method thereof. The preparation method comprises the following steps: reacting 4, 4-diaminodiphenyl ether, norbornene dianhydride and pyromellitic dianhydride to prepare a polyamic acid precursor, adding a nano insulating aid prepared from a silicon dioxide coated nano hexagonal boron nitride in-situ growth copper metal organic framework, compounding with a polyimide film, and carrying out imidization to prepare a modified polyimide film. The norbornene dianhydride reduces the internal stress generated in the formation process of the modified polyimide film, and the nano insulation auxiliary agent can present the stacking tendency in the substrate direction in the film drying and curing process, so that the corona resistance and the mechanical property of the modified polyimide film are improved. According to the invention, the conductor is wrapped by the modified polyimide film, then the fluorine rubber outer sheath is coated, and finally the film sintered wire prepared by sintering has excellent corona resistance and mechanical properties.

The invention discloses polymer PI fiber heat preservation cotton and a preparation method thereof.The heat preservation cotton comprises an inner layer, a middle layer and an outer layer, the inner layer comprises PI fibers and polyvinyl alcohol fibers, the middle layer comprises the PI fibers and skin-core composite fibers, and the outer layer comprises the PI fibers, aramid fibers and low-melting-point fibers; the middle layer PI fiber is a modified PI fiber, and the preparation of the modified PI fiber comprises the following steps: under a nitrogen protection atmosphere, polymerizing pyromellitic dianhydride and 4, 4 '-diaminodiphenyl ether in N, N-dimethylacetamide to obtain a polyamide acid solution; adding phenylacetylene-terminated hyperbranched polysiloxane, fluorinated graphene oxide, a surfactant and a pore-forming agent into the polyamide acid solution, and reacting to obtain a modified polyamide acid spinning solution; and carrying out dry spinning and thermal forming treatment on the modified polyamide acid spinning solution to obtain the modified PI fiber. The obtained heat preservation cotton has the characteristics of heat preservation, washing resistance and comfort.

Polyaryletherketone, PAEK, in the form of particles, is provided for use in component formation by powder bed sintering (PBS). The PAEK is a polyetheretherketone- polyetherdiphenyletherketone (PEEK-P

The invention belongs to the technical field of stealth coatings, and relates to a PI-based porous wave-absorbing coating based on flame spraying and a preparation method of the PI-based porous wave-absorbing coating. The PI-based porous wave-absorbing coating takes porous polyimide as a continuous matrix, and neodymium-doped barium ferrite and multi-walled carbon nanotubes are dispersed in the porous polyimide matrix; through a flame spraying method, spraying suspension liquid formed by 4, 4 '-diaminodiphenyl ether, pyromellitic dianhydride, neodymium-doped barium ferrite, multi-walled carbon nanotubes and an organic solvent is sprayed on the surface of a substrate. The PI-based porous wave-absorbing coating provided by the invention has excellent broadband strong absorption characteristic, can keep stable wave-absorbing performance in a wider thickness range, shows remarkable thickness insensitivity, and greatly reduces the precision requirement on thickness control of the coating.

The invention discloses a preparation method and application of a polyimide / aminated graphene oxide (PI / AGO) composite wave-absorbing film. The method comprises the following steps: preparing aminated graphene oxide (AGO) by grafting p-phenylenediamine to graphene oxide; the preparation method comprises the following steps: dispersing AGO in N, N-dimethylacetamide in an inert atmosphere, and carrying out low-temperature polycondensation on the N, N-dimethylacetamide, 4, 4 '-diaminodiphenyl ether and 3, 3', 4, 4 '-benzophenone tetracarboxylic dianhydride to prepare a polyamide acid / AGO solution; the composite film is obtained through film casting and stepped thermal imidization (150-300 DEG C gradient heating). The innovation lies in that AGO amino groups are bonded with polyimide monomers, nanoscale dispersion (the content is 1.6-2.8 wt%) is achieved, and the problems of high-temperature oxidation and interface defects of traditional filler are solved. The obtained film shows remarkable wave absorbing performance in a Ka wave band (26.5-40GHz), and is suitable for the fields of electromagnetic protection of high-frequency electronic equipment and radar stealth.

The invention relates to a preparation method of 4, 4 '-diphenylmethane The invention relates to a slag kettle for 4, 4 '-diaminodiphenyl ether production, in particular to a blockage cleaning device for the slag kettle for 4, 4'-diaminodiphenyl ether production, which comprises a bottom plate, a collecting hopper is fixedly connected to the upper end of the bottom plate, an angle adjusting mechanism is arranged at the upper end of the collecting hopper, and a first power mechanism is arranged in the angle adjusting mechanism. A lifting mechanism is arranged at the upper end of the angle adjusting mechanism, and the first power mechanism is used for providing power for the lifting mechanism; a second power mechanism is arranged at the upper end of the angle adjusting mechanism, a connecting assembly and a cleaning head are arranged at the upper end of the second power mechanism, and the second power mechanism is connected with the cleaning head through the connecting assembly. According to the slag kettle, the discharging pipe of the slag kettle is automatically cleaned, manual operation is not needed, manual cleaning is not needed, and the working intensity is reduced.

The invention relates to a preparation method and application of a polyimide / sulfur-doped aminated graphene (PI / S-AGO) composite wave-absorbing film. The preparation method is realized by three steps of: firstly, bonding graphene oxide with p-phenylenediamine to prepare aminated graphene (AGO); then enabling AGO to react with sodium polysulfide at 95 DEG C, and embedding sulfur atoms into graphene crystal lattices in a C-S bond form to form sulfur-doped graphene (S-AGO); finally, the S-AGO, 4, 4 '-diaminodiphenyl ether and 3, 3', 4, 4 '-benzophenone tetracarboxylic dianhydride are subjected to low-temperature polycondensation and gradient imidization (150-300 DEG C), and the composite film is prepared. The innovation lies in that lattice defects and polar functional groups introduced by sulfur doping significantly enhance the interface / dipole polarization effect, so that the reflection loss of the material at the Ka waveband (26.5-40 GHz) and 34.8 GHz reaches-65.8 dB, the effective absorption bandwidth is 6.42 GHz (the corresponding thickness is 3.15 mm), the performance is improved by 61% compared with that of an undoped system, and the material is suitable for the fields of 5G communication (28 / 39 GHz), radar stealth and high-frequency electromagnetic shielding.

The invention relates to the technical field of desalting devices, in particular to a desalting device for dinitrodiphenyl ether condensation liquid and a using method thereof.The desalting device comprises a filter vat, the inner end of the filter vat is fixedly connected with a liquid outlet pipe, the outer surface of the liquid outlet pipe is fixedly connected with a plurality of supporting frames, and the supporting frames are located in the filter vat; the inner end of the support frame is fixedly connected with a filter screen for filtering impurities, a water outlet pipe is fixedly arranged in the filter screen in a penetrating manner and is fixedly connected with a liquid outlet pipe, the outer surface of the filter barrel is fixedly connected with a liquid inlet pipe, to-be-filtered liquid enters the filter barrel through the liquid inlet pipe, and the outer surface of the filter screen is sleeved with a cleaning sleeve for removing stubborn filter cakes. A base is fixedly connected to the end, away from the liquid outlet pipe, of the supporting frame, an auxiliary deslagging device is arranged in the base, high-pressure and high-speed airflow excites a resonance rope to generate a Karman vortex street effect, a balancing weight is driven to continuously knock the inner wall of the filter screen, and therefore filter cake falling is effectively promoted, the cleaning efficiency is improved, and long-time stable operation of the filter system is guaranteed.

The invention discloses a regeneration method of a waste ternary battery positive electrode material, and relates to the field of battery materials. When the positive electrode material of the waste ternary battery is regenerated, the ternary lithium ion battery is discharged, disassembled, degummed, roasted, washed with alkali, supplemented with lithium and crushed, polythiophene is polymerized on the surface of the ternary lithium ion battery, then the ternary lithium ion battery reacts with 2, 6-di-tert-butyl-4-bromomethylphenol and (1-methyl-imidazole-5-yl) methylamine in sequence, and a functionalized regenerated ternary material is prepared; the preparation method comprises the following steps: polymerizing 3-aminopropyl dimethyl methoxy silane, dimethyl dimethoxy silane and methyl dimethoxy silane, then reacting with 4-vinyl phenylboronic acid, and finally reacting with 4, 4 '-diphenylboronic acid to obtain a finished product. The regenerated ternary battery positive electrode material is prepared by polymerizing 4, 4 '-diaminodiphenyl ether, 3, 3'-dihydroxybenzidine and hexafluorodianhydride, mixing with carbon black and the functionalized regenerated ternary material, coating the surface of an aluminum foil with the mixture, and drying. The regenerated ternary battery positive electrode material has good cycle stability, durability and self-repairing performance.