69results about How to "Avoid blushing" patented technology

The invention discloses a plastic paint with simulated electroplating effect. The composition and the weight ratio of the invention are as follows: 30 to 45 of acrylic resin with 50 percent of solid content and 70 to 90 DEG C of Tg, 20 to 30 of cellulose acetate butyrate with 20 percent of solid content, 8 to 12 of triad copolymer vinyl chloride-acetate resin with 30 percent of solid content, 6 to 10 of non-floating aluminum and silver pulp with an average diameter less than or equal to 20 Mum, 0.3 to 0.5 of dispersant, 0.2 to 0.4 of flatting agent, 0.4 to 0.6 anti-settling agent, 6.0 to 10.0 of toluene, 3.5 to 6.0 of ethyl acetate, 3.5 to 6.0 methy isobutyl ketone, 3.0 to 5.0 of isobutanol and 4.0 to 7.0 of glycol butyl ether. The special diluent of the invention, according to the weight ratio, is made from the following components evenly mixed: 20 of white gas, 10 of toluene, 22 of ethyl acetate, 15 of acetone, 25 of isobutanol and 8 of glycol butyl ether. The main paint which comprises the composition and the diluent are evenly mixed according to the ratio of 1: 2-3, then the mixture is used for spray coating; the metallic appearance of the paint film obtained is very close to the effect of the electroplating, and the paint film has good alcohol resistance with high hardness and strong wear resistance, and also has simple process. The aluminum and silver pulp used is a common type, the cost of which is only 5 percent to 10 percent of the simulated electroplating aluminum and silver pulp and about 2 percent of electrosilvering.

The invention provides a preparation method of a nonionic waterborne epoxy curing agent, which comprises the following steps: (1) heating and dissolving epoxy resin and polyether polyol, evenly mixing, dropwisely adding catalyst at 50-130 DEG C to carry out polymerization reaction, and after the reaction finishes, dissolving the product in the epoxy resin and solvent to prepare a mixed solution; (2) while stirring, dropwisely adding a monoepoxy compound into basic amine, and reacting at 10-100 DEG C; (3) dropwisely adding the mixed solution in the step (1) into the reaction product in the step (2) at 30-120 DEG C, and enabling the reaction at 10-90 DEG C; and after the reaction finishes, diluting by adding water until the solid content reaches 30-80%, thereby obtaining the nonionic waterborne epoxy curing agent. The method has the advantages of simple technique and mild reaction conditions; the adopted cosolvent has the advantages of low toxicity or no toxicity, and low VOC (volatile organic compound) content; and the substance cured by the product has the advantages of favorable compatibility with epoxy resin and high toughness of the paint film.

The invention discloses a display panel, a visual angle control method of the display panel and a display device. The display panel comprises a first substrate, a first liquid crystal layer, a secondsubstrate, a second liquid crystal layer and a third substrate; the voltage difference between a first electrode and a common electrode on two sides of the first liquid crystal layer is used for switching a first liquid crystal box to a non-peep-proof state in a wide view angle mode and switching to a peep-proof state in a narrow view angle mode; the voltage difference between a second electrode and a third electrode at two sides of the second liquid crystal layer is used for switching a second liquid crystal box to a wide-viewing-angle filtering state in a wide-viewing-angle mode and to a narrow-viewing-angle filtering state in a narrow-viewing-angle mode; and under the narrow visual angle mode, the first liquid crystal box reduces the contrast under the large visual angle, and the secondliquid crystal box reduces backlight light-emitting side luminance under the large visual angle; and the switching of wide and narrow visual angles is realized, and the whitish problem at both sidesof the panel and the gray scale reversal problem when in front view are avoided.

The invention relates to the circuit board production technology field and especially relates to a method of making a step groove on a PCB. During inner layer line making, a copper layer to be removed on a step position is firstly kept; during a subsequent pre-formed groove gonging process, only a prepreg above the copper layer to be removed is gonged, the prepreg above the copper layer to be removed is burnt up with no burning copper laser and then a glue refuse is removed by using a plasma glue refuse removing method, and the copper layer to be removed is removed through alkaline etching so that a condition that a bottom of the step groove is damaged when a cover of a gong groove is taken off can be avoided and zero damage of the bottom of the step groove can be guaranteed. A problem that a window at a position of the prepreg corresponding to the step is opened in advance and water is stored so that pressing is layered and becomes white can be avoided and a yield rate is increased.

The embodiment of the invention provides a graphics barcode scanning method and device, a mobile terminal and a storage medium. The method comprises the following steps: when detecting an applied codescanning operation, a camera is called to collect target image data containing the graphics barcode; ; counting brightness values of the target image data; if the brightness value does not conform tothe preset brightness condition, adjusting the supplemental brightness of the flash lamp; driving the flash lamp to compensate the graphic bar code according to the compensated brightness to improvethe brightness value of the target image data; transmitting the target image data to the application to scan the graphic bar code. The brightness value of the flash lamp can be dynamically adjusted according to the brightness condition, so as to adapt to the environment and reduce the reflection of the light, thereby improving the clarity of the graphic bar code, avoiding the overall over-exposureor whitening of the graphic bar code, improving the success rate of the code scanning, and further, reducing the frequency of the manual adjustment of the position of the user, and reducing the codescanning time.

The invention relates to a light-absorbing antidazzle hard coating film, and a preparation method and application thereof. The light-absorbing antidazzle hard coating film comprises an ultraviolet light curing hard coating and a transparent base material, wherein the ultraviolet light curing hard coating contains light-absorbing antidazzle particulates and is adhered on the transparent base material; the light-absorbing antidazzle particulates comprise antidazzle particles and black pigment, and is prepared by swelling the antidazzle particles by a swelling agent and wrapping the black pigment; the mass proportion of the swelling agent to the antidazzle particles is 50:1-2:1; the mass ratio of the antidazzle particles to the black pigment is 1000:1-10:1. The light-absorbing antidazzle particulates are prepared by wrapping the black pigment by the swelling agent; the antidazzle coating containing the light-absorbing antidazzle particulates is used on the transparent base material; the transparent base material has excellent antidazzle performance; a certain light-absorbing performance is also realized. The light-absorbing antidazzle hard coating film can be applied to screen surfaces and various displays such as liquid crystal displays and plasma displays; the occurrence of phenomena such as white color and glaring caused by external light and self shining can be prevented; the image quality of a display screen is improved.

The invention provides a multi-exposure image fusion method. The multi-exposure image fusion method comprises the following steps: extracting a brightness component of an original image, generating Kexposure images by adopting an S-shaped function according to the brightness component, and calculating the weight of each exposure image according to a brightness mean value of an area needing to beenhanced of each exposure image; and selecting a corresponding image fusion formula according to the distribution type of the cumulative histogram of the original image, and substituting the weight ofeach exposure image into the image fusion formula to obtain the brightness of the target image so as to enhance the details of the target image after image fusion and prevent the target image after image fusion from whitening or blurring.

The invention relates to a construction method for preventing a paint film of an ultraviolet curing paint from blushing, comprising the steps of: coating a primer or a finishing paint; and performing ultraviolet infrared leveling for 3.5-5 minutes. The invention has the advantages that the construction method for preventing the paint film of the ultraviolet curing paint from blushing can effectively prevent bad effect that the paint film of the ultraviolet curing paint blushes, is fast to cure, saves energy sources, has good performance of cured products, and is suitable for high speed automatic production and the like so as to meet the requirements of manufacturing enterprises specialized in art and craft solid wood products or composite solid wood products such as wood doors, furniture, stairs, cupboards and the like.

The invention discloses a method for re-washing a solder resist plug hole, belonging to the technical field of manufacturing of circuit boards. The method comprises the following steps of: (a), putting a plug hole board to be re-washed in a liquid medicine groove containing a swelling agent to immerse and perform swelling treatment; (b), putting the plug hole board immersed by the swelling agent in a water washing groove to wash, and removing the swelling agent on the surface of the board; (c), putting the plug hole board in a re-washing groove containing NaOH solution to immerse; (d), putting the plug hole board processed in the step (c) in the water washing groove to wash; and (e), washing the fetched plug hole board by using a high-voltage water gun, and removing printing ink and NaOH solution on the surfaces of the plug hole and the board. By means of the method disclosed by the invention, solder resist printing ink in the hole of the plug hole board can be effectively removed; and thus, the quality problem that printing ink in small holes cannot be re-washed cleanly after solder resist solidification can be thoroughly solved.

The invention discloses a display module and a display device, and relates to the technical field of display. The display module comprises a display panel; a backlight module which is positioned on one side far away from the light emitting surface of the display panel; a lower polaroid which is positioned between the display panel and the backlight module; a through hole which penetrates through the lower polaroid and the backlight module in the direction perpendicular to the light emitting surface of the display panel; and a polarization conversion device which is arranged in the through hole, wherein at least part of light emitted by the light source of the backlight module enters the through hole through the polarization conversion device and is transmitted to the display panel. The polarization conversion device is used for changing the polarization state of light emitted by the light source. According to the invention, the polarization conversion device is introduced into the display module, at least part of light emitted by the light source of the backlight module can be converted into linearly polarized light from circularly polarized light, and the linearly polarized lightis transmitted to the display panel through the through hole so that the problem that a display picture in the area becomes white after the circularly polarized light is emitted to the display panel is solved, and the display effect of the display panel is greatly improved.

The invention relates to a liquid crystal display panel with switchable wide and narrow viewing angles and a liquid crystal display device. The liquid crystal display panel comprises a first substrate, a second substrate and a liquid crystal layer, wherein a light collecting diaphragm is arranged on the side, away from the liquid crystal layer, of the first substrate; a prism layer is arranged onthe side, facing the liquid crystal layer, of the first substrate; the light collecting diaphragm is used for narrowing light incident from the side, away from the liquid crystal layer, of the first substrate; the prism layer is used for scattering the narrowed light; a first common electrode and a pixel electrode are arranged above the prism layer; a second common electrode is arranged on the side, facing the liquid crystal layer, of the second substrate; a common voltage is applied to the first common electrode; and a viewing angle control voltage used for switching the wide and narrow viewing angles is applied to the second common electrode. According to the liquid crystal display panel, the light collecting diaphragm is used for avoiding whitening of two sides during front viewing, sothat the visual performance at the narrow viewing angle is improved; wide-viewing-angle display is achieved by combining with the prism layer; the first common electrode and the second common electrode are used to form a bias voltage electric field for achieving narrow-viewing-angle display; and therefore, wide and narrow viewing angle switching can be achieved.

The invention discloses a chitosan composite dressing and a preparation method thereof. The composite dressing comprises a chitosan dressing base layer, a medical water absorbing base layer, a waterproof layer and a medical adhesive tape adhesion layer, wherein the waterproof layer covers the medical adhesive tape adhesion layer; the medical water absorbing base layer is positioned between the chitosan dressing base layer and the waterproof layer; air holes are formed in the chitosan dressing base layer; the shapes and the areas of the chitosan dressing base layer, the medical water absorbing base layer and the waterproof layer are the same; anti-adhesion paper covers the chitosan dressing base layer; and the area of the anti-adhesion paper is consistent to that of the medical adhesive tape adhesion layer. The air holes on the chitosan dressing base layer and the medical water absorbing base layer can guarantee high permeability of water and air, and a wound is prevented from turning white and swelling. The medical water absorbing base layer has a water absorbing pad structure with high water absorption capability, tissue exudate penetrates through the air holes and is absorbed by the water absorbing pad, and efficient liquid absorption property is achieved. The waterproof layer can prevent excessive body fluid from permeating onto a medical adhesive tape, a part covered by the dressing can be fixed well, and the dressing cannot drop easily.

The invention discloses a water-based super weather-resistant modified silicone-acrylic acid metal paint coating. The water-based super weather-resistant modified silicone-acrylic acid metal paint coating mainly comprises, by mass, 75 to 85 parts of water-based organosilicon modified acrylic emulsion, 5 to 8 parts of aluminium paste, 0.01 to 0.03 part of butyl cellosolve), 1 to 5 parts of a levelling agent, 1 to 5 parts of a film forming auxiliary agent and 8 to 15 parts of water. The water-based super weather-resistant modified silicone-acrylic acid metal paint coating can be used for one-step spraying; the surface of obtained paint film is compact, bright and smooth; and the obtained paint film possesses high tenacity, and excellent impact resistance and stain resistance. Coating of the water-based super weather-resistant modified silicone-acrylic acid metal paint coating is capable of obtaining endurance, acid and alkali resistance, effective inhibition on growth of algae and fungus, and environmental protection performance. The properties can be maintained unchanged under long-term complex weather conditions for more than 3000 hours; simulation of decorative effect of aluminium-plastic panel can be realized; dazzling metallic luster can be observed; it is difficult for dust to accumulate on the paint film; and the paint film is clean and beautiful.

The invention relates to the technical field of coatings, and particularly relates to a chemical-resistant epoxy inner lining coating and a preparation method thereof. The chemical-resistant epoxy inner lining coating provided by the invention is prepared from a component A and a component B, wherein the component A is prepared from the following components in parts by weight: 29 to 36 parts of bisphenol F epoxy resin, 0.4 to 0.6 part of a wetting dispersant, 0.3 to 0.5 part of an antifoaming agent, 0.4 to 0.6 part of a thixotropic agent, 10 to 18 parts of pigment, 30 to 32 parts of a filler a, 10 to 16 parts of a filler b and 6 to 10 parts of a mixed solvent; the component B is prepared from the following components in parts by weight: 70 to 75 parts of an aliphatic amine additive product, 22 to 27 parts of an organic solvent, 1.5 to 2 parts of a curing accelerator and 1 to 2 parts of an adhesion promoter; and the weight ratio of the component A to the component B is (3 to 4) to 1. The chemical-resistant epoxy inner lining coating provided by the invention is sufficiently cured in a normal-temperature condition, does not contain any active thinners or plasticizers, and has excellent chemical resistance.

The invention relates to a tire brightening protective agent which comprises the following components in parts by mass: 60-80 parts of water, 25-35 parts of vegetable wax, 10-15 parts of natural plant essential oil, 6-9 parts of oleic acid, 3-6 parts of essence, 3-7 parts of sodium hyaluronate and 10-18 parts of triethanolamine. The tire brightening protective agent does not react with any substance due to the unique formula, can effectively prevent the tire from whitening, aging, dry cracking and the like by using the particular permeation technique, saves both time and labor, prolongs the service life of the tire, and is an ideal tire maintenance product.

The invention provides a liquid crystal display device which comprises a display panel, a light modulator used for light receiving and a backlight module. A prism layer is arranged on the display panel and / or the light modulator, a light collecting film is arranged on the backlight module and used for narrowing emergent light from the backlight module leftwards and rightwards, and the prism layeris used for diffusing the light leftwards and rightwards. The light modulator comprises a first light modulator, the first light modulator comprises a first electrode, a second electrode and a first liquid crystal layer, the first liquid crystal layer is located on one side, away from the backlight module, of the prism layer, and at least one light modulator is arranged on the side, away from thebacklight module, of the display panel. According to the liquid crystal display device, a narrow viewing angle mode can be achieved, a contrast ratio is high, and a peep-proof effect is good; peep prevention can be realized by receiving light at a large viewing angle, front-view brightness is not influenced, and a penetration rate is relatively high; color cast can be effectively improved; and twosides can be prevented from being whitened in front view, visual performance under a narrow view angle is improved, and a good wide-narrow view angle display effect can be obtained.

The present invention relates to the technical field of water-based paint, especially the technical field of matte paint, and specifically discloses a matte finish varnish, which comprises the following components in parts by mass: 50-60 parts of water-based acrylic matte emulsion, 30 parts of deionized water ~46 parts, substrate wetting agent 0.05~0.1 parts, defoamer 0.1~0.2 parts, propylene glycol 1~2 parts, film forming aid 1~2 parts, thickener 0.2~0.4 parts. The matte finish varnish of the present invention has the advantages of good gloss and good dispersibility, is not easy to form stratification and precipitation, is stable in storage, and avoids the problem of easy mold and whitening when using matte powder.

The invention discloses a heat-setting metal spraying frame clamp for an automobile electric drive capacitor core. The heat-setting metal spraying frame clamp comprises a rack, a baffle plate, a frame, a pressing assembly and an air cylinder. The rack is of a frame structure. The frame is arranged in the rack, and the lower end of the frame abuts against the bottom end of the interior of the rack.The baffle plate is arranged at the rear end of the rack; and the rear end of the frame abuts against the baffle plate. Through the specially-made heat-setting metal spraying frame clamp, a metal spraying process of the flat core is optimized from winding pre-pressing, hot pressing, wrapping, metal spraying, unwrapping and heat setting to winding pre-pressing, heat setting specially-made metal spraying frame upper clamping, metal spraying, heat setting and unclamping; the whitening of the end surface of the core is avoided, so that the contact resistance between the end surface of the core and a metal spraying layer is smaller, and higher overload current can be borne; the impact of pressure generated by hot pressing and uneven temperature conduction on the core film is avoided, and the withstand voltage of the core is greatly improved.

The invention discloses a water-based UV anti-corrosive coating and a preparation method thereof. The water-based UV anti-corrosive coating comprises the following components in parts by weight: 55-65parts of water-based UV acrylic emulsion, 15-25 parts of anti-dust pigment, 1-7 parts of photoinitiator, 0.1-1 part of wetting agent, 0.1-1 part of flatting agent, 0.05-0.5 part of defoaming agent, 0.2-5 parts of adhesive agent, 1-5 parts of wetting dispersant, 0.1-0.5 part of flash rust resisting agent, 5-20 parts of deionized water, 1-5 parts of anti-settling agent and 0.1-0.5 part of pH regulator. The water-based UV anti-corrosive coating disclosed by the invention has excellent anti-corrosive and waterproof capacities on metal substrates, plastics and cement bases, has ultrahigh water tolerance and satisfying flexibility, is suitable for extensive construction environment, is high in curing speed, contains no VOC and is an efficient environment-friendly water-based UV coating.

The invention discloses a composite mechanical paint suitable for a moist environment, which is composed of the following components in parts by weight: 100 parts of chlorosulfonated polyethylene, 50-64 parts of air-drying organic silicon resin and 23-30 parts of epoxy resin. The composite mechanical paint suitable for a moist environment, which is compounded from the chlorosulfonated polyethylene, air-drying organic silicon resin and epoxy resin, can effectively avoid the phenomenon of whitening of the paint in a moist environment for a long time.

The present invention belongs to the picture display field, and provides an adjusting method of display pictures of a terminal and a terminal. The adjusting method comprises the steps of detecting a photosensitive value of a current environment through a photosensitive sensor of the terminal; acquiring a BV value of the current environment through a camera of the terminal; determining an intensification factor of a gray degree of the current display picture according to the photosensitive value and the BV value; and adjusting the gray degree of the current display picture according to the intensification factor. When the photosensitive value detected by the photosensitive sensor reaches the maximum detection limit, auxiliary detection is carried out through the camera, and the gray degree of the display picture of the terminal is adjusted according to results of the auxiliary detection.

The invention discloses a PVC composite material based on a self-drying water-based aluminum powder coating as well as a preparation method and application thereof. The PVC composite material comprises a PVC material and the self-drying water-based aluminum powder coating, and the coating comprises the following components in percentage by mass: 50-60% of water-based resin, 20-25% of water-based aluminum powder and 5-15% of a water-based additive. The water-based coating is used for replacing oil-based coating, water is used as a solvent, the cost is reduced, safety and environmental protection are achieved, and environmental protection and physical health of constructors are greatly reduced; and a dry film has good transparency, water resistance, weather resistance and yellowing resistance, the coating can be cleaned with water or a cleaning agent after being used for a long time, the corrosion of water to the dry film is avoided, and the influence of humidity in air on the weather resistance and yellowing resistance of the dry film is also avoided.

The invention discloses a non-porous breathable film and application thereof. The film comprises a core layer structure and same or different surface layer structures on the upper side and the lower side of the core layer structure, wherein the material of the core layer structure is copolymerized polyether ester, and the material of the surface layer structures is block copolymerized polyether ester. The film has the characteristics of high air permeability, excellent water pressure resistance, ultraviolet resistance, no yellowing after long-time use and the like, and can be used for preparing textile or shoe material composite fabrics with low cost and good air permeability, antibacterial and air-permeable medical composite fabrics, building composite fabrics with requirements on air permeability and the like. The invention further discloses a method for preparing the film, the method is an extrusion casting method, the cost is low, the efficiency is high, and the method is suitablefor mechanical production.

The invention discloses a pocket hole slashing device of a laser pocket machine. The pocket hole slashing device of the laser pocket machine comprises an operation platform, a machine head, a laser cutting assembly, a cloth clamping and moving mechanism and an upper air suction assembly. A laser pipe is fixed into a laser pipe frame fixed to the lower side of the operation platform. The lower endof a laser guide pipe is connected with the laser pipe. The top of the laser guide pipe is connected with the laser cutting head. A laser cutting opening is formed over the top of the laser cutting head and located on the operation platform. The upper air suction assembly comprises a fixing seat, a lifting mechanism, a laser protective plate, an upper air suction hard pipe, an upper air suction hose and an air suction barrel, wherein the upper air suction hard pipe is fixed to the laser protective plate. The laser protective plate is connected with a lifting mechanism. One end of the upper airsuction hard pipe is an air suction opening. The air suction opening is located over the laser cutting opening. The other end of the upper air suction hard pipe is connected with the air suction barrel through the upper air suction hose.

The invention discloses an opening and shearing device of a laser bag opening machine. The device comprises an operation table, a machine head, a laser cutting assembly, a cloth clamping and moving mechanism and an upper air suction assembly; a laser tube is fixed in a laser tube frame, the laser tube frame is fixed below the operation table, the lower end of a light guide tube is connected to thelaser tube, the top of the light guide pipe is connected to a laser cutting head, and a laser cutting opening is arranged right above the top of the laser cutting head and is formed in the operationtable; the upper air suction assembly comprises a fixing seat, a lifting mechanism, a laser protection plate, an upper air suction hard tube, an upper air suction hose and an air suction barrel; the upper air suction hard tube is fixed on the laser protection plate, and the laser protection plate is connected to the lifting mechanism; and one end of the upper air suction hard pipe is an air suction port, wherein the air suction port is located right above the laser cutting opening, and the other end of the upper air suction hard pipe is connected to the air suction barrel through the upper airsuction hose.

The invention discloses enhanced modified ABS resin and a preparation method thereof. The enhanced modified ABS resin is prepared from the following components in parts by weight: 80-120 parts of ABSresin, 20-30 parts of acrylonitrile-styrene resin, 13-67 parts of glass fibers, 4.5-6 parts of glass beads, 6-8 parts of a styrene-maleic anhydride copolymer, 4.5-6 parts of maleic anhydride grafted polypropylene, 4.5-6 parts of high rubber content ABS and 1.1-1.4 parts of auxiliaries. The invention provides enhanced modified ABS resin and a preparation method thereof. According to the enhanced modified ABS resin, spherical glass beads and maleic anhydride grafted polypropylene are added, so that the problem that the enhanced ABS resin is locally whitened when being used for injection moldingof workpieces is solved, meanwhile, the modified ABS resin has excellent physical and mechanical properties, and the requirements of air conditioner fan blades on strength and thermal change performance are met.

The invention provides a preparation method of a nonionic waterborne epoxy curing agent, which comprises the following steps: (1) heating and dissolving epoxy resin and polyether polyol, evenly mixing, dropwisely adding catalyst at 50-130 DEG C to carry out polymerization reaction, and after the reaction finishes, dissolving the product in the epoxy resin and solvent to prepare a mixed solution; (2) while stirring, dropwisely adding a monoepoxy compound into basic amine, and reacting at 10-100 DEG C; (3) dropwisely adding the mixed solution in the step (1) into the reaction product in the step (2) at 30-120 DEG C, and enabling the reaction at 10-90 DEG C; and after the reaction finishes, diluting by adding water until the solid content reaches 30-80%, thereby obtaining the nonionic waterborne epoxy curing agent. The method has the advantages of simple technique and mild reaction conditions; the adopted cosolvent has the advantages of low toxicity or no toxicity, and low VOC (volatile organic compound) content; and the substance cured by the product has the advantages of favorable compatibility with epoxy resin and high toughness of the paint film.

A photographic film cassette manufacturing apparatus, has a perforator for providing a long film with perforations and a cutter for cutting the long film into individual filmstrips to be contained in the film cassette driven synchronously with transport of the long film. A magnetic recording head for recording data on a magnetic recording layer of the long film is driven in synchronism with the perforator and the cutter. The long film is transported in a first direction before being cut into the individual filmstrips. In cooperation with the cutting, a trailing end of the individual filmstrip in the first direction is moved in a direction which is reverse to the first direction to secure the trailing end to the spool. A cassette shell consisting of a pair of shell halves is temporarily assembled by mating the shell halves together while containing a spool inside the shell halves, and thereafter opened to an extent that confining elements still confine the position of flanges of the spool. The trailing end of the filmstrip is inserted into the opened cassette shell and secured to the spool.

The invention discloses a lithium ion battery diaphragm and a preparation method thereof. The preparation method comprises the following steps that aluminum oxide powder is added into polyimide resin,slurry is prepared after stirring and mixing, wherein the mass of the aluminum oxide powder does not exceed 30% of the mass of the polyimide resin; a base membrane is coated with the slurry, and thebase membrane coated with the slurry is heated and dried at 30-80 DEG C until the mass is constant; and the dried base membrane is fixed on a glass substrate for curing.