19 results about "Polyamide-imide" patented technology

The utility model aims at providing a kind of integrated micro electric signal conductor's cable, realize the integration of multiple signal lines, can effectively suppress common mode interference, fully meet the use requirement under the complex electric field environment of power cable inside, realize safe, reliable and efficient signal transmission, solve the problems of many cable quantity in prior art, large space occupation and easy to be interfered with electromagnetic interference.The utility model includes cable core, the outer layer of cable core is cover layer, the cable core includes several electric power conductor and several signal conductor, the signal conductor is embedded in the gap between the electric power conductor, the outer layer of electric power conductor is crosslinked polyethylene structure, the signal conductor includes N pairs of twisted pair wire, each pair of twisted pair wire includes two twisted enameled wire, the outer layer of signal conductor is wound with polyamide imide film.The utility model is applied to the technical field of power cable.

The application discloses a composite fiber membrane and a preparation method and application thereof. The composite fiber membrane comprises 90-95 parts by weight of polyamide imide, 2-5 parts by weight of polyvinylpyrrolidone and 2-5 parts by weight of a conductive substance. The composite fiber membrane has stable conductivity under an extreme temperature environment (for example, -196 DEG C to 300 DEG C), and has good mechanical properties.

Capacitor (1) comprising a dielectric layer (2) which is uniform, wherein the dielectric layer (2) contains polyamide-imide and a first electrode (3) is arranged directly adjacent to the dielectric layer (2).

Aqueous based compositions having high solids content and stable viscosity over time containing polyamideimide polymers of high acid number and methylethanolamine.

This invention discloses a composition for a railway freight car brake lever bushing, a composite material thereof, and a railway freight car brake lever bushing. The composition comprises the following components in parts by weight: 100 parts by weight of polyimide resin, 50-60 parts by weight of styrene, 180-220 parts by weight of ultrafine heavy calcium carbonate, 45-60 parts by weight of solid lubricant, 25-30 parts by weight of thickener, 40-60 parts by weight of chopped fibers, 0.5-2 parts by weight of initiator, 0.1-0.2 parts by weight of anti-settling agent, and 0.1-0.2 parts by weight of defoamer; wherein the polyimide resin is selected from polyimide resin, polyamide-imide resin, and polyester-imide resin. The composite material of this invention has the characteristics of wide temperature range, high strength, long service life, self-lubrication, friction reduction, and wear resistance; the brake lever bushing prepared thereby solves the problems of corrosion, jamming, and noise of traditional metal bushings, ensuring driving safety.

Problem: To provide a polyamide-imide resin that enables stable spinning of a nanofiber having a small diameter, a polyamide-imide fiber formed from the polyamide-imide resin, and a nonwoven fabric including the polyamide-imide fiber. Solution: A polyamide-imide resin including a constitutional unit derived from an organic acid salt compound.

A friction-reducing and wear-resistant polyamide-imide composite material, a preparation method thereof and an application method therefor are provided, which relate to the technical field of polymer materials. The composite material includes the following raw materials in part by weight: 100 parts of basic slurry, 0.1-20 parts of functional filler, 0-50 parts of diluent, 0.1-1 part of defoamer, and 0.1-1 part of dispersant. The basic slurry is aqueous polyamide-imide emulsion. The functional filler is a biomass carbon composite molybdenum disulfide material treated with a siloxane coupling agent, and a source of biomass carbon is cattail-derived carbon fibers. The composite material has advantages of low friction coefficient and wear rate, wide raw material sources, environmental friendliness, and high dispersion stability. The preparation method has a simple and convenient process and can meet demands for planned production. The material has broad application prospects as a friction-reducing and wear-resistant material in mechanical engineering materials.

The purpose of the present invention is to provide: a binder composition for nonaqueous secondary battery positive electrodes, which has excellent durability with respect to an electrolyte solution and excellent dispersion stability of a positive electrode active material, and with which it is possible to form a secondary battery that has excellent battery characteristics such as charge / discharge efficiency and capacity retention rate; a composition for nonaqueous secondary battery positive electrodes, which contains this binder composition for positive electrodes; a positive electrode for nonaqueous secondary batteries, which is formed of this composition for positive electrodes; and a secondary battery which comprises this positive electrode. As a result of investigations, the invention of a binder composition for nonaqueous secondary battery positive electrodes was completed, the binder composition containing a polyamide-imide that has a repeating unit represented by chemical formula (1). (In the chemical formula (1), R1, R2, and R3 are each independently a hydrogen atom or a methyl group, and at least one of the moieties is a methyl group.)

A resin composition [composition (C)] suitable for use in the preparation of molded articles subject to friction and wear, the composition comprising : - 65.0 to 98.0 wt% of an aromatic poly(amide-imide) [polymer (PAI)], based on the total weight of composition (C); - 0.1 to 5.0 wt% of a ultra-high molecular weight silicone polymer [polymer (UHMW SIL)]; based on the total weight of composition (C); - 0.0 to 30.0 wt% of a graphite, based on the total weight of composition (C); - 0.0 to 30.0 wt% of at least one filler selected from the group consisting of TiO2, ZrO2, SiO2, reinforcing fibers or mixtures thereof, based on the total weight of composition (C).

The application discloses a kind of heat insulation type polyamide-imide fibers, it relates to the technical field of spinning fiber.The polyamide-imide fiber is polyamide-imide as base material, compounding heat insulation modification dispersion liquid containing rare earth source, silicon source, aluminum source and urea, realize three-phase synergistic modification by specific proportion and process, effectively improve heat insulation, heat resistance and mechanical stability.Heat insulation modification dispersion liquid is prepared by the steps such as silicon source hydrolysis, rare earth doping, in-situ generation boehmite phase and supercritical drying, can form nano-porous aerogel structure, reduce heat conduction and enhance high temperature stability.Fiber preparation uses solution polymerization, blending spinning solution and dry spinning process, with inert atmosphere gradient heating and stretching treatment, make inorganic heat insulation phase and organic matrix combine closely, disperse uniformly.The prepared fiber has low thermal conductivity, high breaking strength and good thermal stability, can keep structure integrity and heat insulation effect for a long time, can adapt to the application demand of extreme temperature environment such as special operation protective clothing and high-end thermal clothing.

The present application relates to the technical field of resins, and in particular to an optical resin, a preparation method therefor, and use thereof. The optical resin is a polyamide-imide resin containing at least two of repeating units represented by formula I, formula II, and formula III, wherein R1, R2, R3, R4, and R5 are each independently selected from one of aryl and substituted aryl. According to the optical resin of the present application, by means of introducing the repeating units represented by formula I, formula II, and formula III and an amide bond, the interaction of hydrogen bonds between molecules is used to make the optical resin polymer have a relatively low thermo-optic coefficient. In addition, by means of the reasonable proportioning and combined action of different repeating unit chain segments, the optical resin has good optical properties, good optical transmittance at 1550 nm, and melt processing performance, which can meet injection molding processing requirements.

Coated insulated electrical conductor (10) for use in electric motor windings of electrical machines, comprising a metallic wire (12) and an insulating layer (14) made of polyetheretherketone surrounding the metallic wire (12), characterized in that the insulating layer (14) made of polyetheretherketone has a polyamide-imide coating (16) on its outer surface.

The present application belongs to the technical field of enameled wire, and particularly relates to a polyaryletherketone / polyimide composite enameled wire and a preparation method thereof. The composite enameled wire comprises a copper conductor and a three-layer composite insulating layer covering the copper conductor. The first insulating layer connected with the copper conductor is polyimide or polyamide-imide, and has excellent adhesion. The second insulating layer is low-dielectric polyimide with a dielectric constant of less than 3.0, and has good insulating performance. The third insulating layer at the outermost layer is soluble polyaryletherketone containing a meta-structure and a strong polar structure. The present application also discloses a preparation method thereof. The composite enameled wire is prepared by a solution coating process, is compatible with traditional enameled wire production equipment, and does not need to be customized for a melt extrusion equipment. The composite enameled wire has high breakdown voltage, high partial discharge inception voltage, excellent hydrolysis resistance, corona resistance and chemical corrosion resistance, good mechanical flexibility, and good wear resistance and self-lubricating property, and is suitable for use in high-power density drive motors of 800 V and above, and high-voltage high-frequency use scenarios.

This method for producing a polyimide precursor or polyamideimide precursor includes in the stated order: (A) a step for reacting an acid anhydride derivative and a triazine chloride compound represented by general formula (1) disclosed in the description in the presence of a tertiary amine to produce a compound represented by general formula (2) disclosed in the description or a compound represented by general formula (3) disclosed in the description; and (B) a step for reacting the compound represented by general formula (2) disclosed in the description or the compound represented by general formula (3) disclosed in the description with a compound having two or more amino groups.

The invention provides copolymerized polyamide-imide, a film, a preparation method and an electronic device, and belongs to the field of flexible display materials. The copolymerized polyamide-imide is at least prepared from a reaction system containing the following monomers: a) a fluorine-containing aromatic dianhydride monomer; b) an aromatic diamine monomer containing ether bonds and fluorine; and c) an aromatic diacyl chloride monomer. The copolymerized polyamide-imide disclosed by the invention is prepared by carrying out polycondensation and chemical imidization on a dianhydride component, a diamine component and an acyl chloride component in a polar solvent; a rigid benzene ring structure and a hydrogen bond in a main chain can improve the modulus to be larger than or equal to 6 Gpa, the size stability is high, the thermal expansion coefficient is smaller than or equal to 10 ppm / DEG C, meanwhile, a large-steric-hindrance side group of a benzene ring on the main chain can effectively improve the optical performance of the thin film, light transmittance is prevented from being affected by low-temperature dropwise adding and step-by-step imidization (the light transmittance of the waveband of 360-780 nm is larger than or equal to 88%), the benzene ring structure containing an ether bond on the main chain, and the light transmittance of the thin film is larger than or equal to 80%. The tearing strength of the membrane material can be effectively improved.

A resin composition comprising at least one resin selected from the group consisting of a polyimide precursor, polyimide, a polyamideimide precursor, polyamideimide, and polyamide, and a solvent, wherein the respective contents of N-methylpyrrolidone and γ-butyrolactone relative to the total mass of the resin composition are both 0.1 mass% or less; a cured product formed by curing the resin composition; a laminate comprising the cured product; a method for manufacturing the cured product; a method for manufacturing the laminate; a method for manufacturing a semiconductor device comprising the method for manufacturing the laminate; and a semiconductor device comprising the cured product or the laminate.

The present invention provides a blended film with a tensile strength of 130 MPa or more that comprises: a polyamide-imide including, as polymerization units, trimellitic acid anhydride (TMA) and a diisocyanate monomer including at least one selected from the group consisting of methylene diphenyl diisocyanate (MDI), 1,5-naphthalene diisocyanate(NDI), p-phenylene diisocyanate(PPDI), m-phenylene diisocyanate(MPDI), 2,4-toluene diisocyanate(TDI), 3,3'-dimethyl-4,4'-diphenylmethane diisocyanate, 3,3'-dimethyl-4,4'-biphenyl diisocyanate, 4,4'-diphenylisopropylidene diisocyanate, 3,3'-dimethoxy-4,4'-biphenyl diisocyanate, dianisidine diisocyanate, tolidine diisocyanate(TODI), and hexamethylene diisocyanate; and a polyimide including, as polymerization units, a dianhydride monomer including at least one selected from the group consisting of pyromellitic dianhydride(PMDA), biphenyl tetracarboxylic dianhydride(BPDA), and benophenone tetracarboxylic dianhydride(BTDA), and a diamine monomer including at least one selected from the group consisting of 4,4'-diaminodiphenylether (ODA), 4,4'-methylenedianiline (MDA), metaphenylenediamine (MPD), paraphenylenediamine (PPD), and m-tolidine.

A composition, a polyamide imide, and a polyamide imide film, a preparation method therefor and a use thereof. The composition comprises a dianhydride compound, a diamine compound, and a crosslinking agent. The crosslinking agent is selected from any one of compounds having a structure represented by the following general formula I. R1 is selected from a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, and a substituted or unsubstituted alkoxy group; R2 is selected from a blocking group; n1 is greater than or equal to 2.