20 results about "Polyimide" patented technology

The invention discloses a high-thermal-conductivity polyimide film prepared from a core-shell structure heat-conducting filler and a preparation method of the film. The heat-conducting filler is of acore-shell structure. The film comprises, by mass, 10-50 parts of the heat-conducting filler, 1-5 parts of a modifier and 80-500 parts of a polyamide acid solution. The heat-conducting filler is a boron nitride coated aluminum oxide core-shell heat-conducting filler. The core-shell heat-conducting filler is prepared by treating aluminum oxide by using the modifier and calcining boron nitride at high temperature through an electrostatic self-assembling method. The core-shell heat-conducting filler is added into the polyamide acid solution, stirred and uniformly mixed and subjected to standing to be defoamed in vacuum, the filler is laid to form a film, programmable heating is conducted for imidization, and the high-thermal-conductivity polyimide film is prepared. The film has the main characteristics of high heat conductivity coefficient and electric insulation, the processing cost is low, the preparation process is simple, the forming period is short, and the film has wide applicationprospects in the fields of electronics, aerospace and machinery.

The invention relates to a method for preparing a perylene polyimide derivative film in the technical field of photoelectric materials. In the method, hydrazine hydrate is used for replacing trifluoroacetic acid, a positive electrode deposition method is adopted, and a dense and uniform film is prepared with a low voltage of 0.5-5V and a low current of 0.02-5mA within a relatively short deposition time. Moreover, composite films conforming to various absorption ranges are prepared through changing the structure and the matching of the perylene polyimide derivative.

The invention relates to diamine monomer containing anhydrohexitol unit and its preparation, which pertains to high molecular material area. The progress compresses the following steps: using etherification to make anhydrohexitol react with aromatic nitro halogenide to synthesize nitro compound containing diamine monomer; using reduction to deacidize nitro compound containing diamine monomer to get diamine monomer containing anhydrohexitol unit. The invention possesses the advantages of simplicity of process, sinple control and high yield. Said product can be used in field of optical glass, color filter, optical device and coating material.

An electrical component that includes a substrate and a polymeric layer oriented in working relation with the substrate, the polymeric layer including a low molecular mass polyimide.

The present invention provides a flame-retardant yarn/fabric/clothing, containing the following three types of fibers in percentage by weight percent based on their total weight: modacrylic: 20% to 80%; cellulose: 10% to 50%; and polyimide: 1% to 50%. A vertical burning test is carried out in accordance with GB/T 5455-2014 to test the flame retardance of the flame-retardant yarn, fabric or clothing in the present invention, and the measured char length is lower than 150 mm, 100 or 50 mm. The char length is reduced to different extents, and thus different flame retardance requirements are met.

The invention discloses a friction layer for improving the electrical performance of a nano-generator by using a composite interlayer and a preparation method thereof. The introduced dielectric interlayer enables the charge storage capacity of polyimide and the residual polarization generation capacity of a ferroelectric material to be coupled together, and the output performance of the obtained friction nano-generator is effectively improved; compared with a friction nano-generator without a polyimide@sodium bismuth titanate-strontium titanate composite interlayer, the output performance of the friction nano-generator provided by the invention is 3.20 times that of the friction nano-generator; compared with a friction nano-generator only containing a polyimide (PI) interlayer, the outputperformance of the friction nano-generator provided by the invention is 2.14 times that of the friction nano-generator only containing a polyimide (PI) interlayer; compared with a friction nano-generator with an excessive polyimide@sodium bismuth titanate-strontium titanate composite interlayer, the friction nano-generator provided by the invention has the output performance that is 1.38 times that of the friction nano-generator with an excessive polyimide@sodium bismuth titanate-strontium titanate composite interlayer; according to the invention, development and construction of a theoreticalsystem of the friction nano-generator are facilitated, and a simple and novel mode is provided to realize high output performance.

The invention relates to a transparent polyimide composite film for a flexible display device. The transparent polyimide composite film can be attached to a support carrier, and comprises a transparent polyimide film and an adhesive layer, wherein one side of the transparent polyimide film is provided with a release layer, one side of the adhesive layer is adhered to the release layer of the transparent polyimide film, and the other side of the adhesive layer is provided with a release film so as to make the adhesive layer be adhered to the support carrier after the release film is removed, and the adhesive force between the transparent polyimide film and the release layer is smaller than the adhesive force between the release layer and the adhesive layer, so that the transparent polyimidefilm can be removed from the release layer.

The invention discloses a high-temperature resistant and tensile polyimide base fabric, comprising a base material, wherein the base material is made from polyimide, a first spinning layer is arrangedat the upper end of the base material, a first bonding layer is arranged between the first spinning layer and the base material, the first spinning layer is bonded to the upper end of the base material through the first bonding layer, the first spinning layer is composed of a plurality of first connecting lines and a plurality of second connecting lines, the distance between two adjacent first connecting lines is the same, the distance between two adjacent second connecting lines is the same, and the second connecting lines are all bonded to the upper ends of the first connecting lines. The high-temperature resistant and tensile polyimide base fabric has the advantages: the first spinning layer and a second spinning layer are respectively arranged on the upper and lower ends of the novelbase material, the first spinning layer is composed of the first connecting lines and the second connecting lines, and the second spinning layer is composed of third connecting lines and fourth connecting lines, so that the tensile strength of the base fabric is improved.

The invention provides a laminated plate with compression resistance performance. According to the adopted technical scheme, the laminated plate with compression resistance performance comprises graphite and asbestos fibers, and is characterized in that 1-2 parts of titanium dioxide, 1-5 parts of nitro-alcohol, 5-10 parts of diatomaceous earth and 1-1.5 parts of polyimide are further added to the laminated plate. Compared with the prior art, the laminated plate has the advantage that due to the fact that the titanium dioxide, the nitro-alcohol, the diatomaceous earth and the polyimide are added to the laminated plate, the laminated plate can have good compression resistance performance.

The invention relates to a low-melt-viscosity thermosetting polyimide precursor suitable for resin transfer molding (RTM) and a preparation method of the precursor. The method comprises the followingsteps: commercial binary acid anhydride is used as a basic monomer unit, the commercial binary acid anhydride is combined with a plurality of active monomers to prepare a diaminobisimide macromonomer,the diaminobisimide macromonomer is used as diamine to react with a monoanhydride compound containing a carbon-carbon unsaturated bond, imidization is performed, and therefore the imide oligomer having low melt viscosity, a polymerization degree of 1 and a molecular weight distribution index of 1 is obtained. According to the preparation method provided by the invention, the thermosetting polyimide precursor prepared by the method has a thermal decomposition temperature of higher than 500 DEG C, the melt viscosity of 0.3-0.6 Pa*s, and a resin processing window temperature range from 80 DEG Cto 160 DEG C, can satisfy requirements of the RTM process; and the design idea proposed by the invention can provide technical support for mass production of aerospace polyimide resin composite materials, and provides a possibility for further deepening a wide application of thermosetting polyimide in the field of aerospace.

The invention discloses a coating process of an anticorrosive coating. The coating process comprises the steps of mixing components such as siloxane, a solvent, silica particles, a rare earth compound, deionized water, a catalyst, carbon fibers, polyimide and the like, carrying out curing treatment, filtering the cured mixture, spraying, brushing or impregnating the product on the surface of an explosion-proof substrate, and forming a coating on the surface of the explosion-proof substrate after deposition, thus achieving anticorrosion treatment of the surface.

The invention discloses a device for eliminating static electricity on the surface of a polyimide film. The device comprises a bottom plate, a pair of first vertical plates is fixedly arranged at each of the two ends of the top face of the bottom plate, a first rotating shaft is arranged between each pair of first vertical plates, a first linkage wheel is fixedly arranged at the front end of each first rotating shaft, a linkage bevel gear is fixedly arranged at the rear end of each first rotating shaft, and a third rotating shaft is arranged below each first rotating shaft, a transmission bevel gear is fixedly arranged at the rear end of each third rotating shaft, and a first rotating wheel is fixedly arranged at the front end of the third rotating shaft located on the right side; two pairs of second vertical plates are arranged between the two pairs of first vertical plates, a second rotating shaft is arranged between each pair of second vertical plates, a second linkage wheel is fixedly arranged at the front end of each second rotating shaft, a second belt is arranged between each second linkage wheel and the corresponding first linkage wheel, a belt wheel is fixedly arranged at the rear end of each second rotating shaft, and a first belt is arranged between the two belt wheels, and a static electricity eliminating mechanism is arranged between the two pairs of second vertical plates. The device is convenient to adjust, high in mechanization degree, time-saving and labor-saving.