27results about How to "Improve surface adhesion" patented technology

The invention discloses a preparation method of a composite sodium iron phosphate positive electrode material with high compaction density, which is characterized by comprising the following steps: (1) mixing a sodium source, an iron source, a phosphorus source, a carbon source and the like for preparing the composite sodium iron phosphate positive electrode material in proportion to obtain a precursor aqueous solution; (2) adding a surfactant into the precursor aqueous solution, grinding and uniformly mixing to obtain a homogeneous precursor aqueous solution; (3) carrying out drying granulation on the homogeneous precursor aqueous solution by using a spray drying technology to obtain composite sodium ferric phosphate precursor particles; and (4) performing high-temperature heat treatment on the composite sodium ferric phosphate precursor particles under the protection of inert gas to obtain the composite sodium ferric phosphate positive electrode material. The sodium-ion battery positive electrode material and the electrode plate with high compaction density can be obtained, the reversible specific capacity of the sodium-ion battery is improved, the problem of low gram capacity exertion is solved, the battery capacity is improved, and high-quality sodium-ion battery supply is provided for the field of energy storage.

The invention relates to silver paste, a preparation method thereof and a photovoltaic cell. The silver paste can be used for the photovoltaic cell. The preparation method of the silver paste comprises the following steps: adding composite resin into a solvent to form an organic carrier; adding silver powder and a cross-linking curing mixing agent into the organic carrier, and stirring to obtain initial silver paste; adjusting the viscosity of the initial silver paste and / or the fineness of the initial silver paste to obtain silver paste; wherein the composite resin comprises hydroxyl modified polyester resin. The silver paste prepared through the preparation method of the silver paste has high adhesive force, the working stability of a photovoltaic cell can be improved, and the service life of the photovoltaic cell can be prolonged.

The invention belongs to the technical field of three-dimensional micro-nano manufacturing and sensing, and discloses a self-curling spiral strain sensor and a preparation method thereof, and the method comprises the steps: preparing a patterned graphene conductive film in situ on a top-layer high-molecular polymer film of a flexible film substrate through a laser processing mode; cutting the flexible thin film substrate with the graphene conductive thin film into strip-shaped structures; the swelling effect of the bottom-layer high-molecular polymer film of the flexible film substrate is greater than that of the top-layer high-molecular polymer film, so that the strip-shaped flexible film substrate is subjected to swelling deformation in a solvent, and the self-curling spiral strain sensor can be obtained. The preparation of the flexible spiral structure is realized by utilizing a swelling mechanism, the in-situ preparation of the graphene conductive film is realized by adopting a laser-induced graphene processing mode, the preparation of a multi-level spiral functional structure can be realized by adjusting characteristic parameters, and strain sensors with different sensitivities and working ranges are obtained.

The utility model relates to a nickel net which is characterized in that the nickel net is a multi-strand stranded wire nickel net and comprises transverse stranded wires and longitudinal stranded wires, the transverse stranded wires and the longitudinal stranded wires are woven in a transverse and longitudinal staggered mode to form the nickel net, the transverse stranded wires are formed by stranding a plurality of strands of first nickel monofilaments, and the longitudinal stranded wires are formed by stranding a plurality of strands of second nickel monofilaments. Compared with a traditional nickel net weaving mode, the nickel net and the production process thereof have the advantages that the multi-strand stranded wire nickel net has higher surface area and surface roughness, and has better surface adhesion effect and fewer surface adhesion defects after spraying treatment, so that the catalytic activity of the surface of an electrode is improved, the hydrogen evolution overpotential is reduced, and the service life of the electrode is prolonged. The water electrolysis hydrogen production efficiency is improved.

The invention discloses thermal-aging-resistant polyurethane resin as well as a preparation method and application thereof. The thermal aging resistant polyurethane resin is prepared from the following components in parts by mass: 15 to 45 parts of polyether polyol with a number-average molecular weight of 1000 to 2000, 40 to 70 parts of polyether polyol with a number-average molecular weight of 3000 to 4000, 5 to 15 parts of polycarbonate polyol, 5 to 8 parts of a chain extender, 340 to 430 parts of a solvent, 30 to 50 parts of isocyanate, 0.1 to 0.5 part of an antioxidant, 0.1 to 0.5 part of a catalyst and 0.1 to 0.5 part of a terminating agent. The thermal-aging-resistant polyurethane resin has a high softening point, and can solve the problem that the peel strength of the existing wet-process polyurethane resin finished leather is close to the lower limit after a high-temperature grain-absorbing embossing process.

The present invention relates to the technical field of concrete, and discloses a crack-resistant and waterproof concrete containing modified polyacrylonitrile fiber and a preparation method. The epoxy soybean oil grafted with high molecular weight polyacrylonitrile fiber contains a hydrophobic alkyl long chain and has better compatibility with asphalt. The asphalt containing the modified polyacrylonitrile fiber forms a hydrophobic network in the concrete, thereby improving the waterproof performance of the concrete. The high molecular weight polyacrylonitrile fiber has the advantages of high modulus and high strength, forms a fiber-reinforced phase in the asphalt, and improves the mechanical properties of the asphalt concrete; the asphalt containing the polyacrylonitrile fiber has a high adhesion to the minerals in the concrete, which can improve the surface adhesion performance inside the concrete, is conducive to enhancing the compactness, crack resistance, strength and modulus of the concrete, and expands the practical application of asphalt concrete in roads, steel box girder bridge decks, etc.

The utility model discloses needle grasping forceps under an arthroscope, which belongs to the technical field of needle grasping forceps and comprises a forceps body, a fixed forceps rod is arranged at one end of the forceps body, an extension rod is arranged at the other end of the forceps body, a fixed forceps and a movable forceps are respectively arranged at the tail end of the extension rod, a movable groove is arranged on the inner side of the middle of the forceps body, and a movable forceps rod is arranged in the movable groove. A clamping plate and a positioning plate are arranged on the opposite sides of the fixed forceps rod and the movable forceps rod, a clamping groove is formed in the bottom of the clamping plate, a clamping block is arranged at one end of the positioning plate, a pressing block is arranged at the top of the other end of the positioning plate, and a reset spring is arranged at the bottom of the pressing block. The clamping grooves in the clamping plate are matched with the clamping blocks on the positioning plate to form a clamping state, so that the fixed forceps rod and the movable forceps rod are clamped and positioned, the positioning of the movable forceps is realized, a certain labor-saving purpose is achieved without continuously applying force by a surgeon during use, and better operation of the surgeon is facilitated.

The present invention provides a method for increasing the surface adhesion of molecular sieve particles, and an oxide layer and / or a hydroxide layer are coated on the outer surface of a Cu-SSZ-13 molecular sieve by an atomic layer deposition method; the oxide layer includes one or more of silicon oxide, aluminum oxide, titanium oxide, zirconium oxide and rare earth oxide; the hydroxide layer includes one or more of silicon hydroxide, aluminum hydroxide, titanium hydroxide, zirconium hydroxide and rare earth hydroxide. The present invention is aimed at the disadvantages that the molecular sieve catalyst has low surface adhesion and is easy to fall off after coating, and the molecular sieve is coated with an oxide layer and / or a hydroxide layer to improve the surface adhesion of the molecular sieve. It does not affect the high activity temperature window of the molecular sieve catalyst, reduces the risk of falling of the molecular sieve catalyst, and improves the service life of the catalyst, which has good application value.

The utility model discloses a brewing device and beverage processing equipment, the brewing device comprises a brewing cylinder, a cleaning piece and a first driving mechanism, and the brewing cylinder forms an area to be cleaned; the cleaning part comprises a first cleaning single body and a second cleaning single body, at least one of the cleaning part and the brewing cylinder is movably arranged relative to the other one, and the cleaning part is in sliding butt joint with the to-be-cleaned area so as to remove dirt in the to-be-cleaned area; the driving device is in driving connection with the movably arranged cleaning piece and / or the brewing cylinder; in the relative movement stroke of the cleaning piece and the brewing cylinder, the cleaning piece is provided with a near end close to the to-be-cleaned area and a far end away from the to-be-cleaned area, the near end of the second cleaning single body is closer to the to-be-cleaned area than the near end of the first cleaning single body, and the flexibility of the second cleaning single body is larger than that of the first cleaning single body. According to the utility model, the cleaning effect of the to-be-cleaned area of the brewing cylinder can be optimized as a whole.

The raw material compositions for preparing acrylic optical coatings and for preparing acrylic optical lenses both contain sulfur-containing aromatic acrylate compounds as shown in Formula A. The optical materials prepared from these raw material compositions, with precisely controlled refractive indices of 1.53–1.60, significantly improve the material's resistance to yellowing, optical durability, and impact resistance, meeting the application requirements of high-end optical materials. Wherein, R1 = CH2 = CH-COO, R2 = CH3, n = 2 or 3, and m = 0, 1, or 2.

The invention discloses a polyarylene sulfide sulfone composite current collector film and a preparation method thereof, and belongs to the technical field of current collector preparation, the preparation method of the polyarylene sulfide sulfone composite current collector film comprises the following steps: step 1, premixing PASS resin powder with a stabilizer, an antioxidant, a flexibilizer, an anti-sticking agent and a filler, premixing can be carried out in a low-speed mixer, so that uniform dispersion of all auxiliaries is ensured. By improving the preparation materials, the polyarylene sulfide sulfone film is good in high-temperature resistance, corrosion resistance and flame retardance and excellent in impact resistance and tensile resistance, the risk of separation of the conductive copper layer can be effectively avoided by adopting the film, the advantages of excellent flame retardance, heat resistance and the like of polyarylene sulfide sulfone can be exerted, and the film is suitable for large-scale popularization and application. When a current collector is produced and applied to an automobile battery, the phenomenon of thermal runaway easily caused by internal short circuit of a power battery due to a copper layer is relieved.

The application discloses a kind of crisp leisure food with immersion coating malt dextrin device control system, it is related to food processing technical field, it is applied to immersion coating malt dextrin device.The control system includes state acquisition unit, stage control unit, lock determination unit, result output unit and parameter backwrite unit;Stage control unit controls the material to be processed to successively experience surface layer hole calling section, internal introduction section, even seepage sweeping section, edge moat section, directional side leakage section, low-energy backfill section and front solidification section, so that malt dextrin forms continuous support precursor in material interior;Lock determination unit takes ring moat state as main criterion, takes boundary state and internal support state as verification criterion, after low-energy backfill, when ring moat is not connected again bright, material edge is not sustained bright, and material pressure rebound state is not returned, it is judged that internal support skeleton lock establishment state is established;Parameter backwrite unit writes corresponding control parameters when not locked in.The system is suitable for the processing of raw materials not easy to directly make crisp chips.

The utility model discloses a whole waterproof's smartphone, including the TP cover plate, front shell subassembly, PCBA board, middle frame subassembly and battery cover that set gradually, the first radium carving line circle on the front frame of front shell subassembly is glued with TP cover plate and carries out the point gum seal, and PCBA board is installed at the back of front shell subassembly, and the second radium carving line circle on the back frame of front shell subassembly is bonded with the front frame of middle frame subassembly and seals, and the back of middle frame subassembly is bonded with battery cover and seals, and the FPC point gum groove of each antenna on front shell subassembly is glued and seals, and the earphone loudspeaker spare of two unifications is fixed in the sound cavity of front shell subassembly through dustproof waterproof spare. The line of radium carving can increase surface adhesion, improve the adhesion of glue layer after the point gum, and the FPC point gum groove of each antenna is directly glued and sealed, and the glue layer can isolate outside to realize waterproof dustproof, and can increase the pasting of antenna and front shell subassembly. Dustproof waterproof spare is used for waterproof dustproof protection to earphone loudspeaker spare.

The application provides a thermosetting viologen electrochromic solution and an electrochromic device. The thermosetting viologen electrochromic solution comprises the following components at the following concentrations: 1.5-4.5 g / mL of a diepoxy functional group molecule, 0.5-0.8 g / mL of an anhydride curing agent, 0.1-0.4 g / mL of a viologen compound, and 0.05-0.3 g / mL of a counter electrode material; the diepoxy functional group molecule is at least one selected from bisphenol f diglycidyl ether, bisphenol a diglycidyl ether and bisphenol s diglycidyl ether. The electrochromic device comprises a solid electrochromic layer formed by curing the thermosetting electrochromic solution. The application optimizes the formula, so that the electrochromic solution can achieve thermal curing while ensuring good electrochromic performance, solves the problems of easy leakage and poor safety of the viologen electrochromic device, and can be thermally cured and formed, avoiding the potential adverse effects of the ultraviolet curing method on the performance of the device.

The invention relates to a vertical two-way film pasting device for a full-color photoelectric functional material and a using method of the vertical two-way film pasting device. The vertical two-way film pasting device comprises a manual cleaning mechanism, a feeding mechanism, a plasma processing mechanism, a film pasting mechanism, a discharging mechanism and a conveying mechanism. The manual cleaning mechanism comprises a cleaning table; the feeding mechanism comprises a feeding table; the plasma processing mechanism comprises a processing table; the film pasting mechanism comprises a film pasting table, a roll material feeding mechanism, an adjusting mechanism, a film pulling and stripping mechanism, a positioning and cutting mechanism, a film pulling and grabbing mechanism and a covering mechanism. The discharging mechanism comprises a discharging table. The conveying mechanism comprises a conveying belt, a truss manipulator and a driving system; the cleaning table, the feeding table, the processing table, the film pasting table and the discharging table are sequentially arranged. Double-row work of the single-glass assembly and simultaneous film pasting on the front surface and the back surface of the double-glass assembly can be achieved, the film pasting efficiency is greatly improved, film pasting flatness is guaranteed, wrinkles and bubbles are prevented, and the attaching degree between the film and the assembly is improved.

The invention discloses a honeycomb biological carrier and a manufacturing method thereof, and relates to the technical field of sewage treatment. Comprising a supporting frame, at least one layer of honeycomb structure, a spiral outer rib and a coating, wherein a treatment space is formed in the supporting frame in a surrounding manner; the honeycomb structure is connected with the supporting frame and is arranged in the treatment space; the spiral outer rib is arranged between the honeycomb structure and the supporting frame, and the surface of the supporting frame, the surface of the honeycomb structure and the surface of the spiral outer rib are coated with the coating; the spiral outer ribs are used for increasing spiral disturbance of water flow, by arranging the spiral outer ribs, original linear or disordered motion of the water flow can be forcibly converted into rotary motion guided by the outer contours of the spiral outer ribs, and a retained water film on the surface of a carrier can be effectively damaged; and the substance exchange between the sewage and the surface of the biological membrane is changed from diffusion to convection, so that sludge and impurities are prevented from being deposited in pore channels.

The invention discloses a surface attaching type constant-temperature heat management method and system, and relates to the technical field of temperature control. The surface attaching type constant-temperature heat management method comprises the following steps that at least one heat conduction film is arranged on the outer side of a workpiece, the at least one heat conduction film is attached to the uneven surface of the workpiece for heat transfer, and a cavity of the heat conduction film is filled with heat conduction liquid or a phase change heat conduction material; one end of the heat conduction piece extends into the cavity of the heat conduction film and is in contact with the heat conduction liquid or the phase change heat conduction material for heat transfer; and the other end of the heat conduction piece is cooled or heated according to the cooling requirement or the heating requirement of the workpiece. The fitting degree between heat transfer surfaces can be improved, the heat transfer effect is improved, the heat transfer device is suitable for fitting heat transfer work of uneven surfaces of different workpieces, and the problem that in the prior art, the fitting degree between a heat conduction device and the uneven surfaces of the workpieces such as a cylindrical lithium battery is poor, and consequently the heat conduction effect is reduced is solved.

The invention discloses a UV high-shear blue film adhesive for lithium battery cell insulation protection and a preparation method of the UV high-shear blue film adhesive in the technical field of lithium battery blue film adhesives, and the UV high-shear blue film adhesive for lithium battery cell insulation protection comprises modified polyacrylate main adhesive, saturated polyester resin, epoxy resin, a silane coupling agent, a photoinitiator composition and a solvent, the modified polyacrylate main adhesive comprises ethyl acetate, acrylic acid, butyl acrylate, 2-ethylhexyl acrylate, a special modified monomer, azodiisobutyronitrile and ethyl acetate, the acrylic acid pressure-sensitive adhesive is used as a main body and is matched with the UV cation curing component to prepare the high-shear blue film adhesive, and the high-shear blue film adhesive has the characteristic that the pressure-sensitive adhesive is easy to construct and the mechanical strength of a structural adhesive; the high-shear blue film adhesive provided by the invention can meet the use requirements of a lithium battery in a complex environment, and compared with a traditional lithium battery blue film using a pressure-sensitive adhesive, the high-shear blue film adhesive provided by the scheme has relatively high viscosity and mechanical properties, and can better protect the lithium battery.

The invention relates to the field of glass, and particularly discloses a substrate and TGV through hole glass suitable for the field of semiconductor packaging and a preparation method of the TGV through hole glass. The glass is prepared from the following components: 52 to 73 percent of S < iO >, Al < 2 > O < 3 >, B < 2 > O < 3 >, MgO, Sr < O >, CaO, BaO, ZrO2 and Fe < 2 > O < 3 >. According to the glass, a glass matrix obtained through a float glass forming process is subjected to annealing and chemical strengthening, high-alumina-silica matrix glass is obtained, and then surface plasma treatment and modified silicon carbide fiber treatment are performed, so that the adhesive high-alumina-silica glass is obtained. The glass has excellent dielectric constant and expansion coefficient, keeps extremely strong light transmission on the premise of strong interface adhesion, can be used as a substrate for packaging a large-size wafer / panel, can be further plated with copper in a glass through hole technology, can improve the stability of a metal copper plating layer, and has a wide application prospect.

The invention relates to the field of preparation of medical dressings, in particular to a preparation process of a medical liquid repair dressing. According to the technical scheme, the dressing is prepared from the following components in percentage by mass: 2.5 to 5 percent of onion extract, 0.5 to 2.5 percent of saffron crocus extract, 0.25 to 1.5 percent of chamomile essential oil, 0.05 to 0.5 percent of allantoin, 0.5 to 1 percent of seaweed gel, 0.5 to 1 percent of carrageenan, 0.03 to 0.5 percent of hydrolyzed collagen, 0.02 to 0.5 percent of hyaluronic acid, 1 to 2 percent of humectant, 0.5 to 2.5 percent of polyvinyl alcohol, 0.1 to 1 percent of glutaraldehyde and 92 to 95 percent of deionized water. The medical liquid repair dressing has the beneficial effects that the polyvinyl alcohol is added into the medical liquid repair dressing, and the polyvinyl alcohol is a modifier with high initial adhesion, so that the initial surface adhesion of the medical liquid repair dressing can be enhanced, and the adhesion is gradually lost after water evaporation; when water in the medical liquid repair dressing is evaporated and needs to be torn down for replacement, adhesion between the surface of the repair dressing and the surface of a wound is reduced, and discomfort of a patient is reduced.

The invention discloses a polyurethane coating with hydrophobicity and multiple curing performance and a preparation method of the polyurethane coating. Aliphatic diisocyanate and unsaturated dihydric alcohol are used as raw materials to prepare an unsaturated polyurethane prepolymer containing-NCO end groups, then a hydroxyl-terminated silane coupling agent synthesized through sulfydryl double bond reaction is added for sealing, and the polyurethane coating is prepared. A series of silane-terminated unsaturated polyurethane is obtained through reaction and can be used for preparing a polyurethane coating with hydrophobicity and multiple curing performance; polyurethane with the main chain being a carbon chain containing double bonds and the end group being silane is synthesized, rapid ultraviolet light hardening of the surface of the coating is achieved, the end group silane rapidly migrates to the surface, the interior of the coating is crosslinked through multiple curing, the hydrophobicity, the adhesive force, the surface strength and other performance of the coating are effectively improved, and the coating has the good application prospect. The method has potential application prospects in the fields of buildings, automobiles, aerospace and the like.

This invention discloses a rare-earth-doped optical imaging film and its preparation method. The method specifically includes: providing an optical glass substrate and pre-treating its surface; sputtering a base layer onto the surface of the optical glass substrate; depositing a rare-earth-doped layer onto the surface of the base layer; etching micro / nano structures onto the surface of the doped layer; using the micro / nano structures to enhance the luminescence efficiency of the doped layer; depositing a hydrophobic layer onto the surfaces of the doped layer and the micro / nano structures; and annealing the optical glass substrate forming the base layer, doped layer, and hydrophobic layer to obtain the rare-earth-doped optical imaging film. Through optimized design of the base layer, doped layer, and micro / nano structures, the optical imaging film exhibits higher luminescence efficiency, lower light loss, and maintains stable optical properties during long-term use. Therefore, this invention solves the technical problem of the imbalance between high refractive index and low absorption loss in existing optical imaging films.

The invention discloses a fiber bundle, a fiber woven mesh and a fiber woven mesh reinforced concrete composite material, and belongs to the technical field of building materials. The technical problem that in an existing fiber woven mesh reinforced concrete composite material, the interface mechanical property of fibers in fiber bundles and a base body is poor is solved. According to the technical scheme, superfine concrete dry powder is attached to the surface of treated continuous fiber yarn, the continuous fiber yarn is twisted to obtain a core layer, the core layer is wrapped with a water-soluble wrapping layer to obtain a fiber bundle, and the fiber bundle is used for preparing a fiber woven mesh; the fiber woven mesh is used for preparing a composite material. The method has the beneficial effects that through fiber surface treatment, the adhesive force of the superfine concrete dry powder on the surfaces of the continuous fibers is improved, the adhesion uniformity is good, and the interface performance between the continuous fibers and a matrix can be effectively improved, so that the mechanical property of the composite material is remarkably improved.

This invention discloses a graphene-reinforced TPU adhesive and its preparation process, relating to the field of polyurethane materials technology. The invention involves mixing epoxy resin and a silane coupling agent, reacting them under the catalysis of dibutyltin dilaurate to obtain a silane epoxy resin, which is then reacted with isophorone diisocyanate and polytetrahydrofuran ether diol to obtain a polyurethane prepolymer solution. Modified graphene is then added, dispersed at high speed, and a chain extender and curing agent are added. The mixture is heated to react, and after the reaction is complete, cooled to room temperature to obtain the graphene-reinforced TPU adhesive. This invention improves the mechanical strength and thermal stability of the TPU adhesive by adding modified graphene. Surface modification of graphene is achieved by using quaternary ammonium salt didodecyl dimethyl ammonium bromide as a graphene modifier. The intercalation reaction between didodecyl dimethyl ammonium bromide and graphene oxide reduces the interfacial energy between graphene and thermoplastic polyurethane, enhancing the dispersibility and barrier properties of the TPU adhesive.

The invention relates to an alkyl diphosphonic acid composition as well as a preparation and purification method and application thereof, and belongs to the technical field of preparation of alkyl diphosphonic acid compositions. The alkyl diphosphonic acid composition comprises the following components in percentage by mass: more than or equal to 90% of diphosphonic acid compound with a structural formula I, 0-10% of phosphorous acid, 0-10% of phosphoric acid, 0-10% of alkyl phosphonic acid, 0-10% of dialkyl phosphonic acid and 0-10% of organic acid, the alkyl diphosphonic acid composition can be applied to metal surface anti-corrosion treatment, such as deposition on iron, aluminum, copper and zinc to form a self-assembled single layer or organic phosphonate multilayer, so that the metal corrosion resistance is enhanced, and the inhibition effect on metal corrosion is achieved.

This case involves a base film used for MLCC release film and its preparation method. The PET film adopts ABA three-layer structure co-extrusion, and after longitudinal stretching, it is first coated and then transversely stretched, and finally pulled and rolled; wherein, the raw material of layer A includes 70 to 90 parts of PET slices and 10 to 30 parts of special masterbatch; the raw material of layer B is PET slices; the special masterbatch is made of KH550 modified inorganic filler and semi-aromatic polyamide. The present invention adopts ABA three-layer structure to prepare PET film. First, special masterbatch is added to the A layer structure with PET as the basic material, so that the film material has excellent mechanical properties and heat resistance, and also has low roughness, avoiding the risk of inorganic particles precipitation; in addition, a layer of antistatic coating liquid is coated on the longitudinally stretched sheet, and the coating is firmly bonded, which improves the antistatic performance of the film and can be used as the base film of MLCC release film.

The application belongs to the technical field of polymer films, and relates to a polytetrafluoroethylene vacuum bag film and a preparation method and application thereof. The preparation method comprises the following steps: first, turning a polytetrafluoroethylene rod blank to obtain a polytetrafluoroethylene turned film; then, adopting a hot roller to roll the obtained polytetrafluoroethylene turned film at 320-420 DEG C to obtain a polytetrafluoroethylene rolled film; finally, contacting one side of the obtained polytetrafluoroethylene rolled film with a sodium-naphthalene tetrahydrofuran treatment solution with a molar concentration of 0.2-0.8 mol / L for not less than 30 s to obtain the polytetrafluoroethylene vacuum bag film. The polytetrafluoroethylene vacuum bag film prepared by the above preparation method has a smooth and flat film surface and no obvious wrinkles, one side can keep the original non-stickiness and excellent demolding characteristics of polytetrafluoroethylene, and the other side has good surface adhesion, can be reliably bonded with a sealing rubber strip or a mold frame, and is suitable for a composite material forming process.