181 results about "Ptfe composite" patented technology

The invention relates to the technical field of high polymer materials, in particular to a modified PTFE composite material and a preparation method thereof.The modified PTFE composite material comprises polytetrafluoroethylene resin and an MXene material, and the MXene material accounts for 5%-15% of the total mass of the modified PTFE composite material. According to the modified PTFE composite material provided by the invention, a specific amount of MXene material is added into polytetrafluoroethylene resin, so that the wear resistance of the modified PTFE composite material is effectively improved, and the mechanical property, thermal stability and other properties of the modified PTFE composite material can be improved, thereby improving the overall performance of the modified PTFE composite material. Therefore, the method has a wider application range.

The invention relates to the technical field of composite materials, in particular to a PTFE composite material for a shaft sleeve and a preparation method of the PTFE composite material. The PTFE composite material for the shaft sleeve consists of the following raw materials in parts by weight: 80-140 parts of polytetrafluoroethylene powder, 3-8 parts of polyphenylene sulfide, 8-12 parts of modified glass fibers and 10-15 parts of a reinforcing agent. The lubricating property of a base material is effectively improved by adding the modified glass fiber, and meanwhile, the wear resistance and the mechanical property of the polytetrafluoroethylene composite material are favorably improved by improving the tribological property, enhancing the mechanical strength and improving the interface bonding and load dispersion through the reinforcing agent.

The invention relates to a hydrophobically modified aluminum oxide and polytetrafluoroethylene composite film as well as a preparation method and application thereof. According to the present invention, the aluminum oxide is firstly subjected to hydroxylation treatment, and then the surface of the aluminum oxide is subjected to hydrophobic treatment by using cyclosilazane, such that the Al-OH content of the prepared hydrophobic modified aluminum oxide surface is low, such that the water absorption rate of the aluminum oxide-PTFE composite film is low, and the aluminum oxide-PTFE composite film is not easily interfered by moisture, and has good electrical insulation performance. In addition, amino groups (-NH2) or imino groups (-NH-) are further introduced into the surface of the hydrophobic modified aluminum oxide and can form hydrogen-bond interaction with C-F bonds in PTFE, so that the compatibility of the hydrophobic modified aluminum oxide and the PTFE is improved, and the mechanical property of the aluminum oxide-PTFE composite film can still be kept under the condition of high addition amount of aluminum oxide.

The invention discloses a preparation method and application of a PTFE composite filter material with a denitration function, and belongs to the technical field of filter materials. A high-temperature-resistant PTFE polymer needled filter material is used as a base material, and polydopamine and MXene are adopted to carry out functional modification on the fiber surface of the filter material, so that the dispersion degree and the synergistic effect of a catalyst on the fiber surface are improved; the preparation method comprises the following steps: uniformly loading a manganese-cerium denitration catalyst precursor on the surface of a filter material fiber by virtue of an equivalent-volume impregnation method, then calcining to obtain an active component of the denitration catalyst, and finally impregnating in hydrogen peroxide to further activate the composite filter material, so that the low-temperature denitration activity of the composite filter material is improved. The PTFE composite filter material prepared by the invention has good denitration capability at low temperature, retains the original dust filtering effect in the preparation process, can meet the requirement of low-temperature denitration and dust removal integration in industrial tail gas, and effectively overcomes the defects of complexity, high treatment cost and the like of a tail flue gas purification system in the prior art.

The invention belongs to the technical field of polytetrafluoroethylene microporous membranes, and relates to an Al2O3 / PTFE composite microporous membrane and a preparation method and application thereof.The Al2O3 / PTFE composite microporous membrane is composed of Al2O3 nanoparticles and PTFE resin, the porosity is 65%-95%, the thickness is 3-25 microns, the average pore size is 0.10-1.5 microns, the transverse and longitudinal tensile strength is larger than or equal to 20 MPa, and the water contact angle is smaller than or equal to 90 degrees. According to the invention, the Al2O3 / PTFE composite microporous membrane is endowed with good surface wettability and excellent mechanical property by utilizing self-humidifying and in-situ reinforcement of Al2O3 nanoparticles, and the Al2O3 / PTFE composite microporous membrane is mainly applied to a reinforcing material of a proton membrane. The preparation process is simple, and industrial popularization is easy to realize.

The invention relates to the field of nylon materials, in particular to a high-temperature-resistant nylon / PTFE composite material and a preparation method and application thereof. The high-temperature-resistant nylon / PTFE composite material is prepared from the following raw materials in parts by weight: 40 to 90 parts of modified nylon, 0.5 to 15 parts of polytetrafluoroethylene, 5 to 15 parts of composite filler, 1 to 3 parts of compatilizer and 0.1 to 0.3 part of antioxidant, the composite filler comprises modified calcium fluoride whiskers, modified glass beads and modified hexagonal boron nitride. Through collaborative design of multiple performance dimensions such as interface, heat resistance, wear resistance, mechanics and the like, the composite material has excellent high-temperature stability, low-friction wear resistance and high-strength mechanical performance at the same time, has remarkable breakthrough in comprehensive performance and service life compared with a traditional nylon-based composite material, and has extremely high technical innovation and practical value.

The invention relates to the technical field of composite materials, in particular to a composite material for a waterproof breathable film and a preparation method of the composite material. The composite material for the waterproof breathable film comprises the following raw materials: PTFE resin, zinc oxide, a surfactant, a compatibilizer and a waterproof filler, the waterproof filler is a porous inorganic carrier material treated by a silane modified waterproof agent; the silane modified waterproof agent is a compound containing a perfluoropolyether chain segment and a siloxane chain segment. According to the prepared composite material for the waterproof and breathable film, the porous filler is subjected to surface modification through the perfluoropolyether-silane coupling agent, and the waterproofness, breathability and mechanical property of the PTFE composite material can be synchronously and synergistically improved.

The invention belongs to the technical field of cable production and processing, and discloses a surface treatment method of a smooth wrapped cable for aviation, which comprises the following steps of: 1, firstly, adopting a PI / PTFE (Polytetrafluoroethylene) composite belt on the inner layer of a cable conductor, optimally adopting 50.8%-51.5% of wrapping lap joint, adopting a PTFE special-shaped belt to wrap the outer layer, adopting a wrapping belt with the thickness of 0.07 mm, adopting 50.8%-51.3% of lap joint, adopting a three-roll-shaft die to tightly press in the same direction after the wrapping is completed, and adopting a three-roll-shaft die to tightly press in the same direction; and the pressing outer diameter is 0.1-0.2 mm smaller than the wrapping outer diameter. In the cable wrapping process, surface pretreatment is carried out, then high-temperature grinding secondary treatment is carried out, and then the wrapped cable is coated with the PTFE insulating layer, so that the surface of the cable is smoother, the surface smoothness is reduced to 10% or below, the seamless effect can be achieved, meanwhile, the insulating thickness of the surface of the wire is increased, the cable is more wear-resistant and pressure-resistant in the machining process, and the service life of the cable is prolonged. The service life of the cable is effectively prolonged, the durable effect of the cable is effectively improved, and if friction is generated between the cable and other metal materials, the situation that the surface of the cable is damaged can also be avoided.

The invention discloses a PTFE composite emulsion and a membrane filter material, the PTFE composite emulsion comprises a polytetrafluoroethylene dispersion liquid and bentonite added in the polytetrafluoroethylene dispersion liquid, the polytetrafluoroethylene dispersion liquid comprises polytetrafluoroethylene, a silane coupling agent and deionized water, and the addition amount of the bentonite is 0.02-0.05 wt% of the polytetrafluoroethylene. After the bentonite is added into the polytetrafluoroethylene dispersion liquid, microscopic detection shows that the base material impregnated by the polytetrafluoroethylene dispersion liquid can effectively avoid emulsion condensation linearity on fibers, and the distribution uniformity of the emulsion on the fibers of the base material is improved.

The invention provides semiconductor-grade PTFE (polytetrafluoroethylene) composite granule granulation equipment and a granulation process, and belongs to the technical field of high polymer material processing. The semiconductor-grade PTFE composite granule granulation equipment comprises a double-screw extruder and a cooling water tank arranged on one side of a discharge port of the double-screw extruder, an isolation barrel is mounted at the top of the cooling water tank, a granule cutting tank is fixedly mounted in the cooling water tank, a water inlet pipe is fixedly mounted at the bottom of the granule cutting tank, and a water outlet pipe is fixedly mounted at the bottom of the water inlet pipe. A discharging pipe is fixedly installed on the grain cutting box, the end, away from the grain cutting box, of the discharging pipe extends out of the cooling water tank, and a grain cutting knife is arranged in the grain cutting box. The semiconductor-grade PTFE composite granule granulation equipment provided by the invention has the advantages that the granule cleanliness and the structural stability can be improved, the processing precision is improved, the defective rate is reduced, and the maintenance is convenient.

The invention relates to the technical field of high-frequency transmission cables, in particular to a high-stable-phase cable preparation technology based on a graphene PTFE composite wrapping tape, and the technology comprises the steps: controlling a traction device to pull a to-be-wrapped body to a corresponding wrapping region; the wrapping tapes of the corresponding layers are correspondingly conveyed to the corresponding wrapping positions of the wrapping area respectively; respectively obtaining the thickness of a plurality of detection point positions of the high-stable-phase test cable and the width of a wrapping tape overlapping area so as to determine an expansion area; adjusting the distance between the guide wheels according to the overlapping proportion of the overlapping area and the expansion area of the wrapping tape, or adjusting the distance between the guide wheels and the to-be-wrapped body according to the expansion length, and adjusting the wrapping angle according to the area proportion of the layered expansion area; and sequentially performing plasma surface treatment and staged hot-pressing curing to output a finished product of the high-stable-phase cable. According to the invention, the accuracy of the wrapping process and the heat control capability are improved.

The invention relates to the technical field of polymer composite films, and particularly discloses a high-heat-resistance PFA / PTFE composite film and a preparation method thereof. The preparation method comprises the following steps: carrying out ball milling on polytetrafluoroethylene (PTFE), a modifier and a wetting agent at room temperature to obtain modified PTFE; then adding the modified PTFE and fusible polytetrafluoroethylene (PFA) granules into a torque rheometer for blending, extruding at the temperature of 350-380 DEG C and the rotating speed of 100-150rpm, and driving polytetrafluoroethylene fibrillated fragments and a PFA melt to generate semi-molten entanglement in a high shear field, so that the polytetrafluoroethylene and the PFA form a mutual coating structure, chain segment slippage is effectively inhibited, and split-phase crystallization is eliminated; and finally, carrying out hot pressing to prepare the PFA / PTFE composite film. The preparation method eliminates macroscopic phase separation, keeps the stability of mechanical properties while improving the heat resistance of the material, and is suitable for manufacturing high-reliability cable insulation and nuclear-grade sealing elements.

This invention relates to the field of polytetrafluoroethylene (ePTFE) membrane technology. Addressing the problem that existing expanded PTFE films cannot meet the high-performance standards of superhydrophobicity and superoleophobicity, this invention specifically discloses an expanded PTFE composite membrane and its preparation method. The expanded PTFE composite membrane includes an ePTFE base membrane and an fPTFE / SiO2 particle composite layer disposed on the surface of the ePTFE base membrane. The fPTFE / SiO2 particle composite layer includes a PTFE composite and SiO2 particles. The PTFE composite comprises polyethylene oxide and PTFE in a dry weight ratio of 1:10-30, and the SiO2 particles have a particle size of 100-1000 nm. By coating the ePTFE base membrane with PTFE and SiO2 particles to construct the fPTFE / SiO2 particle composite layer, and then modifying the membrane surface with silica-fluorination, the distribution of SiO2 particles can be specifically controlled to impart superhydrophobic and superoleophobic properties to the expanded PTFE composite membrane, with both water and oil contact angles >150°.

The invention relates to a Bi2O3 / PTFE composite material and a preparation method and hydrogen sulfide detection application thereof.The Bi2O3 / PTFE composite material comprises Bi2O3 nanoparticles and PTFE nanofibers, the PTFE nanofibers are interwoven into a three-dimensional network structure, the Bi2O3 nanoparticles are distributed on the surfaces of the PTFE nanofibers and among pores of the three-dimensional network structure in a cluster mode, the Bi2O3 nanoparticles are embedded into the pores of the three-dimensional network structure, and the Bi2O3 nanoparticles are embedded into the pores of the three-dimensional network structure. The Bi2O3 nano particles are embedded on the surfaces of the PTFE nano fibers; the preparation method comprises the following steps: firstly preparing a first spinning solution and a second spinning solution, then preparing a precursor nanofiber membrane from the first spinning solution and the second spinning solution through bidirectional opposite spraying electrostatic spinning, and then sintering the precursor nanofiber membrane to obtain the product, the product is used for detecting whether hydrogen sulfide gas exists. The Bi2O3 / PTFE composite material disclosed by the invention is high in stability, and Bi2O3 nanoparticles are not easy to fall off; the preparation method is simple; the hydrogen sulfide detection is convenient, simple and portable.

The invention discloses a fluorine-containing emulsion constant-pressure feeding device and a polyimide composite film production system.The fluorine-containing emulsion constant-pressure feeding device comprises a liquid supplementing tank and an emulsion tank, and a liquid supplementing pipe used for conveying emulsion to the emulsion tank through the pressure difference between the liquid supplementing tank and the emulsion tank is arranged between the liquid supplementing tank and the emulsion tank; the emulsion tank is provided with a compressed gas inlet pipe and a compressed gas exhaust pipe, and the constant-pressure feeding device for the fluorine-containing emulsion further comprises a controller which is used for controlling the pressure in the emulsion tank to be basically constant by controlling the compressed gas flow of the compressed gas inlet pipe and the compressed gas flow of the compressed gas exhaust pipe. And the outlet of the emulsion tank is also provided with a feeding pipe for conveying the emulsion to the emulsion coating device through the pressure difference between the emulsion tank and the emulsion coating device. The invention further discloses a polyimide composite film production system provided with the fluorine-containing emulsion constant-pressure feeding device. The method is suitable for preparing the high-performance PI / PTFE composite film.

The invention relates to the technical field of high polymer materials, in particular to a bronze powder filling modified PTFE composite material and a preparation method and application thereof. The bronze powder filled and modified PTFE composite material comprises bronze powder and PTFE, wherein the bronze powder accounts for 30-50% of the total mass of the bronze powder filled and modified PTFE composite material; the microstructure of the bronze powder is irregular. According to the bronze powder filling modified PTFE composite material, the bronze powder material with a certain proportion and an irregular microstructure is filled into the polytetrafluoroethylene resin, so that the friction and wear properties of the PTFE composite material are effectively improved, and meanwhile, the mechanical properties of the PTFE composite material subjected to filling modification in multiple aspects are remarkably improved.

The invention relates to the field of dielectric energy storage materials, and discloses a high-energy-storage modified BNNS / PTFE composite film and a preparation method thereof. The composite film comprises a polytetrafluoroethylene matrix and modified boron nitride nanosheets dispersed in the polytetrafluoroethylene matrix, the modified boron nitride nanosheet comprises a boron nitride nanosheet, polydopamine combined on the boron nitride nanosheet and a silane coupling agent grafted on the polydopamine; the silane coupling agent comprises a fluorine-containing silane coupling agent and an amino silane coupling agent containing at least one amino group and at least one imino group. According to the preparation method disclosed by the invention, the polydopamine is combined on the boron nitride nanosheet, and then two specific silane coupling agents are grafted, so that the composite film can be endowed with relatively good dielectric property and high-temperature energy storage property.

The invention discloses a sintered PTFE (polytetrafluoroethylene) composite microporous breathable film and a preparation method thereof. The sintered PTFE composite microporous breathable film is prepared from the following raw materials in parts by weight: 70 to 90 parts of PTFE resin, 20 to 30 parts of Ni-B-Si, 10 to 15 parts of kerosene, 5 to 20 parts of thermoplastic elastomer, 3 to 10 parts of nano filler, 0.2 to 0.6 part of initiator, 0.5 to 2 parts of dispersant and 0.1 to 0.5 part of antioxidant. By introducing various materials and optimizing the process, the PTFE composite material with a uniform microporous structure, high air permeability, excellent mechanical property and chemical corrosion resistance is prepared.

A method for preparing a composite material for a PTFE-based sliding bearing having a mesh structure, comprising the following steps: providing a PTFE composite material; mixing the PTFE composite material; providing an auxiliary oil; subjecting the oil-containing mixture to blanking, extrusion, and calendaring to obtain a PTFE oil-containing calendaring film; the compression ratio of blanking extrusion is 20-80, the calendaring speed is 3.5-5.0 m / min, and the thickness of the PTFE oil-containing calendaring film is 0.1-0.5 mm; the PTFE oil-containing calendaring film is degreased, biaxially stretched, and shaped to obtain a PTFE-based sliding bearing fabric having a mesh structure; the composite material is compounded with a metal substrate to obtain a high-strength PTFE-based sliding bearing having a mesh structure. The mesh structure formed by the present preparation method can store grease, and the sliding bearing using the fabric can continuously release grease under conditions of less oil, oil cutoff, and boundary lubrication, thereby obtaining a continuous low-friction operating condition, reducing fabric wear, and extending the service life of the sliding bearing.

This invention discloses a method for producing PTFE filter fabric. It involves feeding PVC-U and PTFE filaments without drafting onto a ring spinning machine equipped with a yarn guiding device including a mounting frame, an arc-shaped connecting piece, and a spiral yarn guide hook. This allows for positional adjustment of the yarn guide hook and yarn tube during operation, maintaining concentricity and achieving efficient plying. High-temperature setting removes PVC-U, effectively preserving the crimp formed by the twisting of the PTFE filaments, resulting in PTFE twisted filaments with improved cohesion. By using PTFE, PPS, and aramid filaments as core yarns and the other two as outer layers, three types of PTFE composite yarns are produced. The PTFE twisted filaments are used as weft yarns, and the three types of PTFE composite yarns combined with the PTFE twisted filaments are used as warp yarns, achieving the processing of a PTFE filter fabric with both excellent strength and breathability.

This invention discloses a method for preparing a low-loss ultrathin PTFE microwave dielectric substrate. The method includes the following steps: 1. Preparation of PTFE composite adhesive; 2. Impregnation with glass fiber cloth; 3. Lamination of sheet substrates. The PTFE microwave dielectric substrate prepared by this method has fine filler particles and a high filling rate, improving the uniformity of the ultrathin substrate thickness and dielectric constant. The substrate thickness is 0.065mm ± 0.008mm, and the dielectric constant at 10GHz is 2.95 ± 0.03. It also reduces the loss factor at high frequencies, with a loss factor ≤ 0.0011 at 10GHz. The preparation process is simple, easy to scale up for continuous production, and the microwave substrate exhibits excellent performance, meeting the stringent performance requirements of multilayer circuit boards in high-frequency communication applications.

The invention discloses an acid and alkali resistant composite material and a preparation method and application thereof in solar photo-thermal water evaporation, and belongs to the technical field of photo-thermal conversion materials, the key point of the technical scheme is that the preparation method of the acid and alkali resistant composite material comprises the following steps: S1, mixing pure water, ethanol and isopropanol to obtain a mixed solvent; s2, molybdenum acetylacetonate is dissolved in a mixed solvent to obtain a mixed solution; s3, the mixed solution and a hydrophilic PTFE film are mixed and then heated for 8-12 h at the temperature of 180-220 DEG C, and the MoO2 / PTFE composite material is prepared, molybdenum dioxide balls grow on the hydrophilic PTFE film through a solvothermal method, the water evaporation rate of the composite material can be kept stable in the severe environment (acidic, alkaline or high-salt), and therefore the composite material shows excellent stability and durability, and the composite material can be used for preparing the composite material. In addition, the used materials are low in price, the manufacturing process is simple, and popularization is easy.

The application relates to the technical field of composite tape materials, in particular to a low-elongation PTFE composite tape material and a preparation process thereof; the low-elongation PTFE composite tape material is prepared from the following raw materials in parts by weight: 20-30 parts of polytetrafluoroethylene, 3-6 parts of functional powder, 3-5 parts of modified fiber, 2-4 parts of nano titanium white powder, 3-5 parts of paraffin oil and 2-5 parts of antioxidant; the polytetrafluoroethylene, the functional powder, the modified fiber, the nano titanium white powder, the paraffin oil and the antioxidant are put into a mixing equipment to be mixed and stirred, after being uniformly mixed, the obtained mixture is extruded into a strip shape by using a pusher, then the strip is continuously calendered into a sheet by using a double-roller calender, the obtained sheet is calendered at room temperature by using the double-roller calender, a PTFE composite tape semi-finished product is obtained, and finally the obtained PTFE composite tape semi-finished product is heated; the prepared low-elongation PTFE composite tape material not only has a low breaking elongation, but also has excellent wear resistance, so that the quality and the performance of the low-elongation PTFE composite tape material are effectively ensured.

The invention belongs to the technical field of oil-water separation membranes, and particularly relates to a PTFE composite hollow fiber membrane with a gradient oleophylic structure. The hollow fiber membrane is of a special structure with the lipophilicity gradient enhanced from outside to inside, the outer side of the hollow fiber membrane is a super-hydrophobic layer, the interior of the hollow fiber membrane is a gradient oleophylic layer, and efficient adsorption, coalescence and directional separation of emulsified oil drops are achieved through the synergistic effect mechanism of outer hydrophobic and water-repellent and inner oleophylic and oil-gathering. The membrane takes PTFE as a framework material, is endowed with excellent chemical stability and environmental tolerance in combination with a surface modification process, can stably operate under extreme conditions of high temperature, high salt, strong acid, strong alkali and the like, realizes high-efficiency separation of an emulsified oil-water mixture, has outstanding anti-pollution performance and cycling stability, and can be widely applied to the fields of oil-water separation, oil-water separation, oil-water separation, oil-water separation, oil-water separation, oil-water separation and oil-water separation. And a reliable technical solution is provided for industrial oily wastewater treatment.

The invention belongs to the technical field of functional film materials, and relates to a wear-resistant and aging-resistant ship functional film as well as a preparation method and application thereof. The invention aims to solve the problems of single function and poor marine environment adaptability of the existing ship functional film. The preparation method comprises the following steps: carrying out surface modification on nano-zinc oxide to prepare modified nano-particles, and carrying out in-situ emulsion polymerization reaction on the modified nano-particles and tetrafluoroethylene to prepare ZnONPs / PTFE composite powder; preparing a polyimide film through processes such as low-temperature polymerization reaction, and then performing annealing treatment and surface activation to obtain a polyimide functional layer; and coating the ZnONPs / PTFE composite powder on the surface of the polyimide functional layer through electrostatic spraying, heating and pressing to obtain the polytetrafluoroethylene functional layer, and finally obtaining the wear-resistant and aging-resistant ship functional film. The wear-resistant and aging-resistant ship functional film provided by the invention has high corrosion resistance and mechanical strength in a marine environment, and has a good application prospect in the field of ships.

The invention belongs to the technical field of diffusion welding and thin-wall seamless steel pipe bulging, and relates to a gas cylinder for filling high-pressure oxygen and a manufacturing method thereof, the gas cylinder comprises a thin-wall seamless steel pipe liner, a gas cylinder joint, a Teflon lining coating, a high-molecular polymer layer, a carbon fiber reinforced winding layer and an external protection layer, the bottle body is formed through multiple times of water pressure bulging, and cracks and wrinkles caused by spinning are avoided; electroplating a nickel-iron-PTFE composite layer on the inner surface, and spraying and sintering PTFE to form an antioxidant lining; the outer surface is fully wound with a carbon fiber main bearing structure after being subjected to injection molding of a polyethylene layer, and then is coated with a glass fiber and epoxy resin protective layer. A traditional spinning process is abandoned, forming is uniform, defects are avoided, the connector strength is high, the sealing performance is good, the light weight level, the fatigue life and the use safety of the gas cylinder are remarkably improved, and the gas cylinder is suitable for medical, aviation and other high-purity high-pressure oxygen storage scenes.

The application provides a kind of semiconductor grade PTFE composite pellet granulation equipment and granulation process, belong to high polymer material processing technical field. Wherein, semiconductor grade PTFE composite pellet granulation equipment includes double screw extruder and the cooling water tank being arranged in the discharge port side of double screw extruder, the top of cooling water tank is installed with isolation cylinder, cutting box is fixedly installed in cooling water tank, water inlet pipe is fixedly installed in the bottom of cutting box, discharge pipe is fixedly installed on cutting box, the end of discharge pipe away from cutting box extends to the outside of cooling water tank, and cutting knife is arranged in cutting box. The semiconductor grade PTFE composite pellet granulation equipment provided by the application has the advantages of improving pellet cleanliness and structural stability, improving processing precision and reducing waste rate, and being easy to maintain.

The invention discloses a manufacturing process of a novel high-corrosion-resistance PI-PTFE (Polyimide-Polytetrafluoroethylene) composite microporous breathable material. The manufacturing process comprises the following steps: mixing PI powder, Na2CO3 powder, SrCO3 powder and Mg (OH) 2 powder in a solvent; high-strength PI mixed powder is obtained after high-temperature sintering; the preparation method comprises the following steps: mixing PI mixed powder with a solvent to form slurry, coating a glass substrate with the slurry, and drying, pressing and heating to form PI films with different pore diameters or porosities; and finally, the composite film with high corrosion resistance is formed by gluing, hot melting welding or laser welding with the PTFE film. The PI powder, the Na2CO3 powder, the SrCO3 powder and the Mg (OH) 2 powder are sintered to prepare the PI film, and then the PTFE film is subjected to gluing, hot melting welding or laser welding to form the composite film, so that the low bonding property caused by blending is avoided, the high strength, high corrosion resistance and high air permeability in the use process are ensured, and the applicability is relatively high.

The application discloses a kind of polyimide composite film drying device and production system, polyimide composite film drying device includes for the polyimide substrate film surface coating emulsion formed by polyimide composite film passing and carrying out microwave heating drying microwave heating area and for the polyimide composite film after microwave heating drying passing and carrying out infrared heating drying infrared heating area, the microwave heating area and infrared heating area are sequentially arranged and mutually communicated, and polyimide composite film sequentially passes the microwave heating area and infrared heating area along vertical direction.The application further discloses a kind of production system with above-mentioned polyimide composite film drying device.The application can be used to dry PI / PTFE composite film, and drying efficiency is high, drying effect is good, can guarantee the quality of final composite film product.

This utility model relates to the field of heat exchanger technology and discloses a PTFE-graphene composite membrane heat exchanger, including a heat recovery core. The heat recovery core comprises several honeycomb flow channel cores spliced ​​together, each of which adopts a graphene-PTFE composite membrane structure. The honeycomb flow channel core is set at a 15° inclination angle relative to the primary air inlet. The graphene-PTFE composite membrane structure, from the inside out, includes a graphene inner coating, a PTFE microporous base membrane layer, and a SiO2 nano-hydrophobic layer fixed together. The hexagonal honeycomb flow channel core of the graphene-PTFE composite membrane structure and the 15° inclination improve heat exchange efficiency and gas handling capacity. The turbulence control strategy further enhances the system performance, improves sensible heat efficiency, avoids water accumulation and frost formation, and makes the system more stable and efficient.