2861 results about "Thermal shrinkage" patented technology

The invention discloses a lithium battery diaphragm coating based on a nano material and application thereof, and relates to the technical field of lithium battery diaphragms. The coating comprises the following raw materials in parts by weight: 15-25 parts of polystyrene maleic anhydride copolymer modified polyvinylidene fluoride, 10-20 parts of polystyrene, 2-4 parts of nano silicon nitride, 3-6 parts of a boehmite / aluminum oxide and silicon dioxide composite material, 1-2 parts of a dispersing agent and 65-90 parts of a solvent, according to the lithium battery diaphragm coating provided by the invention, the wettability and absorptivity of a diaphragm to an electrolyte are remarkably improved, meanwhile, the lithium battery diaphragm coating also has excellent thermal stability, and the diaphragm can be effectively prevented from thermal shrinkage or melting under a high-temperature condition, so that the safety performance of a battery is remarkably enhanced.

The invention relates to an antistatic PET (Polyethylene Terephthalate) base film for preparing a polaroid release film and a preparation method thereof, the release film base film is prepared by taking an optical-grade PET slice as a main body, adding modified PET with a specific structure and a modified SiO2 filler, and carrying out co-extrusion casting, a unique three-section stretching process and coating with a coating liquid. According to the invention, material modification and process improvement are carried out, specifically, an optical-grade PET slice is taken as a main body material, modified PET and a modified SiO2 filler with a specific structure are added, a film is prepared through co-extrusion casting and a unique three-section stretching process, and then the surface of the film is coated with a layer of antistatic coating liquid, so that the antistatic film is obtained. The finally prepared base film has low alignment angle, low transverse hot shrinkage rate and high surface adhesion, keeps the characteristics of high light transmittance and low haze of an optical-grade polyester film, endows the film with certain antistatic property, and is particularly suitable for being used as a release film of a high-end polaroid.

The invention provides an intelligent sorting method and system for radioactive substances. The method comprises the following steps: synchronously detecting surface element composition and radiation intensity of a radioactive substance through an X-ray fluorescence spectrometer, and constructing a spatial difference matrix of element abundance distribution and a radiation gradient topological graph; the three-dimensional coordinates, the pressure threshold value and the shape adaptation parameters of the target grabbing position are determined on the basis, the curvature radius of the clamping jaw deformation contour is dynamically adjusted, and the error of the dynamic geometric envelope and the contour template is converged to be within the threshold value; finally, when the clamping jaw reaches a target position, the area of the heat shrinkage material is activated to be heated according to the radiation intensity abrupt change boundary coordinates, a sealed isolation layer synchronously expanded with the dynamic geometric envelope is generated, and safe grabbing and sealed isolation of radioactive substances are achieved. According to the technical scheme, accurate grabbing of radioactive substances, error self-adaptive compensation and synchronous isolation of radiation leakage can be achieved, and the sorting safety and efficiency are improved.

The invention relates to the technical field of batteries, in particular to a solid electrolyte, a battery containing the solid electrolyte and a preparation method of the solid electrolyte. Wherein the solid electrolyte is prepared from an electrolyte precursor through a thermally initiated in-situ polymerization process; the electrolyte precursor comprises cellulose, a polymer monomer, a lithium salt, a plasticizer, an additive and a thermal initiator; according to the invention, cellulose is dissolved in a solid electrolyte precursor and is uniformly compounded with the diaphragm during in-situ polymerization, so that the thermal shrinkage resistance of the diaphragm and the overall safety of the battery are improved; compared with a process for improving the safety by using cellulose on the diaphragm side, the method has the advantages that the diaphragm does not need to be subjected to any additional treatment, the thickness of the diaphragm is not increased, and the prepared battery is good in comprehensiveness and low in cost; in the preparation process of the battery, the cellulose-containing solid electrolyte and the diaphragm are compounded to form a solid electrolyte-diaphragm compound with high mechanical strength and high thermal stability, so that the resistance of the battery to thermal runaway is improved.

The invention relates to the technical field of control systems, in particular to a production process optimization control system and method for a heat shrink film. The method comprises the following steps: obtaining resin characteristic parameters of a heat shrink film raw material, and constructing an initial digital twinborn model by using the resin characteristic parameters; acquiring real-time production data, and updating the initial digital twinborn model by using the real-time production data to obtain a complete digital twinborn model; and performing melt ultrasonic-assisted homogenization and two-way stretching process simulation based on the digital twin model, and performing optimization analysis by using a simulation result to generate optimized process parameters. By constructing and updating the digital twinborn model, the melt uniformity and process parameter optimization are accurately controlled, the quality consistency and stability of the thermal shrinkage film are improved, and the product is ensured to meet the mechanical, optical and thermal shrinkage performance requirements.

The invention discloses an integrated preparation method of a composite lithium battery diaphragm, and belongs to the technical field of lithium battery diaphragms.The integrated preparation method comprises the following steps that one or two faces of a base film precursor are coated with slurry, drying and shaping are conducted after transverse stretching, and the composite lithium battery diaphragm is obtained; the slurry is prepared from the following raw materials in parts by weight: 0.1-1 part of a dispersing agent, 2-10 parts of an adhesive, 0.1-1 part of a wetting agent, 0.2-10 parts of a thickening agent, 100 parts of a solvent and 20-45 parts of modified inorganic filler, continuous and synchronous production of the composite diaphragm is realized through the integrated design of base diaphragm production and coating processing, the production process is simplified, the cost is saved, and the production efficiency is improved. Meanwhile, the thermal stability of the composite diaphragm can be greatly improved, so that the thermal shrinkage of the diaphragm is reduced to about 1 / 10 of the original thermal shrinkage; the adhesive has good release force and liquid absorption rate, and has good application prospects and economic benefits.

The invention belongs to the technical field of dielectric film materials, and particularly relates to a preparation method of a polypropylene film for a film capacitor, which comprises the following steps: S1, preparing a casting sheet; s2, primary synchronous stretching; s3, carrying out primary transverse stretching; s4, carrying out secondary transverse stretching; s5, carrying out secondary synchronous stretching; and S6, post-processing. The preparation method of the polypropylene film can be used for preparing the ultra-wide polypropylene film for the film capacitor, which is uniform in thickness, high in longitudinal tensile strength, high in transverse elongation rate and low in thermal shrinkage rate.

The invention relates to the technical field of lithium ion batteries, in particular to a polymer coating diaphragm and a secondary battery. The polymer coating is a double-block bottle brush polymer particle with a core-shell structure, and the polymer particle comprises a bottle brush-shaped core polymer and a shell polymer; the glass transition temperature of the core polymer is greater than or equal to 90 DEG C, and the glass transition temperature of the shell polymer is less than or equal to-10 DEG C. According to the diaphragm binder disclosed by the invention, the core layer has a relatively high glass transition temperature, and meanwhile, the introduced bottle brush polymer structure can further effectively reduce the thermal shrinkage of a diaphragm and enhance the heat resistance; the shell layer has a low glass transition temperature, the cohesiveness at room temperature is significantly improved, and the introduced bottle brush polymer structure has high stability. The ceramic diaphragm prepared by adopting the diaphragm binder disclosed by the invention has relatively low thermal shrinkage rate and relatively strong binding power with a negative pole piece.

The invention relates to the technical field of vacuum packaging, and discloses fresh meat cold-chain vacuum packaging equipment convenient to use and a method. The convenient-to-use fresh meat cold chain vacuum packaging equipment comprises a supporting platform serving as a basic supporting structure; and the product placing cavity is arranged at the top of the supporting platform and is used for placing fresh meat products. The heat shrinkage film driving device provided by the invention not only can achieve the automatic switching effect of the heat shrinkage film, but also successfully realizes the automatic tensioning and transferring operation of the last section of the heat shrinkage film by virtue of the elaborately designed tail end film drawing mechanism. According to the operation process, a series of precise actions such as clamping, cutting off and rotating transferring are sequentially executed on the last section of thermal shrinkage film. No matter whether the last section of the thermal shrinkage film is tightly and firmly connected with the winding drum or in a relatively loose connection state, the transfer task of the last section of the thermal shrinkage film can be smoothly completed.

The invention discloses high-crystallinity superfine nickel powder and a preparation method thereof.The generation size of nickel powder in a liquid phase is adjusted through ultrasonic waves, molten salt heat treatment is combined to obtain the high-crystallinity superfine nickel powder, and the preparation method specifically comprises the following steps that an aqueous solution in which a nickel precursor is dissolved is mixed with a reducing agent; under the action of ultrasonic waves, an alkaline solution is added for a reaction, and nickel powder particles with the adjustable particle size are prepared; and then uniformly mixing the nickel powder with combined salts in different proportions, carrying out heat treatment at different temperatures, and cleaning and separating a cooled product to finally obtain the high-crystallinity superfine nickel powder with the size of 100-200nm. The nickel powder has good size uniformity, oxidation resistance and thermal shrinkage resistance, and can be applied to various fields such as conductive paste, metal electrodes and magnetic shielding materials.

The invention discloses a dry-process high-temperature-resistant lithium battery diaphragm and a preparation method thereof, and relates to the technical field of lithium battery diaphragms. The specific preparation method comprises the following steps: activating and cross-linking polypropylene, polyimide, a PP-b-PI block copolymer and a cross-linking agent BIBP under the protection of nitrogen to prepare a polypropylene-polyimide matrix; after melting, adding a pre-sintered ZrO2-coated Al2O3 core-shell filler, hydroxylated boron nitride and zinc borate, and carrying out double-stage screw extrusion, ultrasonic orientation, nitrogen annealing and cold roller quenching to obtain a mixed melt; carrying out warm stretching and hot air circulation heat treatment to prepare a hard elastic crystal base film; carrying out stretching, thermal relaxation and thermal shaping to obtain a microporous base membrane; after slitting, plasma activation is carried out, epoxy silane and tetraethyl orthosilicate / polybenzimidazole aerogel precursors are sprayed, and a nano closed-pore coating is formed through pre-curing and heat shrinkage curing; and finally eliminating static electricity and rolling to obtain a finished product. The lithium battery diaphragm prepared by the invention is excellent in high temperature resistance and low in thermal shrinkage rate.

The invention belongs to the technical field of lithium battery production, and particularly relates to a cylindrical battery pole end half film sleeving device which comprises a rack large plate, a feeding and discharging mechanism, a push rod mechanism for pushing a battery to a rotating platform, a transplanting mechanism for rotating and positioning the battery, a battery film sleeving mechanism, a battery discharging mechanism, a film sleeving mechanism support and a rotating support mechanism. According to the invention, after thermal shrinkage, the protection on the end face of the positive electrode is ensured, and the code spraying requirement is met; the use amount of materials is effectively saved, so that the production and purchase cost is reduced; the problem of non-uniform thermal shrinkage caused in the production process of the battery cell membrane is solved, and the customization requirement of a user for tagging on a steel shell or membrane can be met; safety protection of an effective physical level is provided for the junction sealing end of the positive electrode and the negative electrode of the battery, and the safety risk caused by short circuit due to collision under the condition that the formation and capacity grading end is electrified and transplanted is avoided; during steel shell code spraying, a code scanning gun reads and stores a code assigned on the sleeve film during use, and battery data can be conveniently traced during production.

The invention relates to the technical field of high polymer materials, in particular to a block copolymerization modified para-aramid polymerization solution and a preparation method and application thereof.The preparation method comprises the steps that in the inert gas atmosphere, hydrotropy salt is dissolved in an organic solvent to obtain the polymerization solution; adding a third monomer and terephthaloyl chloride into the polymerization solution, and controlling the reaction temperature to carry out pre-polycondensation reaction to obtain an amino-terminated oligomer system; adding p-phenylenediamine and paraphthaloyl chloride into the oligomer system, and controlling the stirring reaction temperature to carry out block copolymerization reaction under the stirring condition; and after the block copolymerization reaction is finished, adding a neutralizer to neutralize acidic substances generated in the reaction process, and finally obtaining the modified para-aramid polymer liquid in the neutral environment. The polymer liquid is applied to the field of lithium battery diaphragms, and the modified aramid fiber coated diaphragm which is excellent in thermal shrinkage performance, high in diaphragm rupture temperature, porous in structure and high in puncture resistance is obtained.

The invention relates to a full-biodegradable polyester composite material and a heat shrink film thereof. Corn starch, PBAT and PLA are used as main raw materials, glycerin, water and polyethylene glycol-6000 are used as composite plasticizers, B225 is used as an antioxidant, and solid paraffin and oleamide are used as lubricants. The preparation method comprises the following steps: adding corn starch, glycerol, water, PEG-6000, B225, solid paraffin and oleamide into a high-speed mixer, stirring to obtain plasticized corn starch, adding PBAT and PLA into the high-speed mixer, mixing with the plasticized corn starch, stirring, discharging, putting into an extruder, extruding and granulating to obtain a full-biodegradable polyester composite material, and extruding and blowing to obtain the thermal shrinkage film. The polyester composite material prepared by the invention can be biodegraded under the condition of matured compost, the biodegradation rate is 91.22%, the relative biodegradation rate is 96.55%, and products are carbon dioxide and water and meet the GB / T 41010-2021 standard requirements.

The invention relates to the field of heat shrinkage films, in particular to an antistatic PETG heat shrinkage film. The PETG heat shrink film comprises the following components in parts by weight: 100 parts of PETG resin, 2-6 parts of an anti-adhesion agent, 2-5 parts of a lubricant, 1-5 parts of an antistatic modifier, 1-2 parts of an antioxidant and 0.5-1 part of a light stabilizer. In the preparation process of the PETG heat shrink film, a novel borate antistatic agent is introduced, and the antistatic agent is synthesized by taking tris (2-carboxyethyl) isocyanurate and 4-aminophenylboronic acid pinacol ester as raw materials, so that compared with a traditional antistatic agent, the antistatic property is better, the heat stability is obviously improved, and the service life of the heat shrink film is prolonged. And the phenomenon of local deformation or poor arc-shaped shrinkage of the PETG heat shrinkage film when the PETG heat shrinkage film shrinks at a non-uniform interface is reduced.

The invention discloses an aramid fiber coated polyolefin battery diaphragm and a preparation method and application thereof, the aramid fiber coated polyolefin battery diaphragm can be used for manufacturing a lithium ion battery, and the aramid fiber coated polyolefin battery diaphragm is prepared by the following method: (1) treating a polyolefin base membrane by using a strong oxidant to obtain a modified base membrane; (2) dissolving aramid resin in a solvent to obtain an aramid coating solution; and (3) coating the surface of the modified base membrane with the aramid fiber coating liquid, and then curing. According to the invention, the interface bonding strength of the base membrane and the aramid fiber coating is obviously enhanced, so that the aramid fiber coating can give full play to high heat resistance, on the basis of ensuring the tensile strength of the diaphragm, the overall thermal shrinkage rate of the diaphragm is reduced, the risk of high-temperature short circuit is effectively inhibited, and the composite diaphragm with high porosity, strong mechanical property, high uniformity and no surface defect is formed; the method is suitable for high-energy-density lithium ion batteries, and the safety and high-temperature working condition stability of the batteries are remarkably improved.

The invention discloses a multilayer co-extrusion heat-shrinkable film and a preparation method thereof, the film comprises an outer wear-resistant layer, a middle support layer and an inner functional layer, the thickness ratio of each layer is 1: 3: 1-1: 5: 1, the total thickness is 50-150 [mu] m, and the raw materials are prepared according to respective formulas. The preparation method comprises the steps of raw material preparation, melt mixing, die head extrusion, two-way stretching, water-cooling shaping, electronic crosslinking, aging treatment, heating softening and cold and hot shaping. The carbon nanotubes (CNT) and the h-BN nanosheets synergistically hinder crack propagation in the middle layer, so that the crack propagation resistance of the film is remarkably improved, the tensile strength, the thermal shrinkage rate and other properties are also optimized, compared with a traditional film, the comprehensive properties of wear resistance, high strength and high thermal shrinkage rate are achieved through interface collaborative design, meanwhile, the production cost is reduced by 20-30%, and the application prospect is wide. The method is suitable for food packaging, electronic device protection and other fields.

The invention discloses a high-safety temperature-responsive electrolyte, a lithium ion battery and a sodium ion battery, the high-safety temperature-responsive electrolyte comprises a thermal response solvent, a cosolvent and an electrolyte salt, the thermal response solvent is a thermal response polymer monomer, the thermal response polymer monomer has at least one of the structures of vinyl ether, divinyl ether, dialkenyl amide and dialkenyl butanediimine, the thermal response polymer monomer can quickly form a polymer solid electrolyte under the catalysis of an initiator salt in electrolyte salt under a high-temperature condition, and the fixation of the solid electrolyte enables a diaphragm in a battery not to collapse, so that the battery diaphragm can be used as a lithium ion battery diaphragm. Therefore, short circuit caused by thermal shrinkage and fusion of the diaphragm is avoided, and thermal runaway is avoided. The electrolyte can be used for preparing the lithium-ion and sodium-ion battery, and the lithium-ion and sodium-ion battery can keep a relatively high capacity retention rate while giving consideration to the safety performance.

The present application relates to the technical field of lithium-ion batteries, and particularly relates to a separator and a secondary battery. The separator provided in the present application comprises a base film and a coating which is provided on at least one surface of the base film, wherein the coating comprises a ceramic layer and an adhesive layer, and the ceramic layer comprises ceramic particles, a binder and a functional material; the porosity of the coating of the separator is 35-65%; and the surface density of the coating is 0.5-14 g / m2. The separator in the present application has good thermal stability, and the degrees of thermal shrinkage in an MD and a TD under a high-temperature condition are relatively small. The separator has good liquid absorption and retention capabilities for electrolytic solutions, and has good wettability, so that rapid passing and homogeneous transmission of lithium ions during a reaction can be ensured. Moreover, the separator can also reduce the risks of capacity reduction and local overcharging, thereby playing the role of protecting secondary batteries. By using the separator in the present application, an improvement in the power density, energy density and safety of secondary batteries is facilitated.

The invention relates to a flame-retardant breakdown-resistant metallized film and a capacitor, the flame-retardant breakdown-resistant metallized film comprises an aluminum shell, a capacitor core and an epoxy resin layer for packaging the capacitor core, and the capacitor core is formed by winding and metal spraying the flame-retardant breakdown-resistant metallized film; and preparing a metal coating on the surface of the flame-retardant modified insulating film through a vacuum coating process. According to the flame-retardant breakdown-resistant thin-film capacitor, through a manufacturing process of modifying an existing insulating base film, adding a flame retardant into polymer particles, and then spraying a corona auxiliary liquid on the thin film to be matched with corona treatment, the defects that the hot shrinkage rate of the thin film is too large and the impact strength is low due to the addition of the flame retardant can be overcome; and finally, the flame retardance and the breakdown resistance of the thin film capacitor are remarkably improved.

The invention discloses a 110kV high-voltage polypropylene power cable, and relates to the technical field of power cables, and the 110kV high-voltage polypropylene power cable comprises an outer sheath, a conductor is installed in the outer sheath, the conductor is sleeved with a cable core sleeve, a shielding sleeve is embedded in the outer wall of the cable core sleeve, an inner spacer bush is installed on the inner side of the outer sheath, and an outer spacer bush is installed on the outer side of the inner spacer bush. According to the invention, bidirectional limiting and locking protection of the inside and the outside of the cable can be realized, multiple supports are provided for the inside of the cable, the internal stress stability of the cable in the use process is effectively balanced, and the service life of the cable is prolonged. The interface compatibility among the structures in the cable is equivalently improved, the interface air gap generated by the thermal shrinkage of polypropylene is effectively compensated, the double restraint of water branches and electric branches is realized, the multiple optimization of the mechanical performance is structurally realized, the stability of the electric insulation performance is improved, and the effective service life of the cable is prolonged.

The utility model relates to the technical field of beverage cup processing, and provides a printing cup automatic packaging and marking device which comprises a controller, a rack, a first conveying mechanism, a second conveying mechanism, a limiting mechanism, a pushing mechanism, a counting sensor, a sealing, cutting and thermal shrinkage all-in-one machine, an air blowing mechanism and a packaging bag printing machine. The limiting mechanism is arranged on the machine frame in a vertically-lifting mode and located between an outlet of the first conveying mechanism and an inlet of the second conveying mechanism, the conveying of the plastic cups is separated according to the packaging number of the plastic cups, and the blowing mechanism is arranged at the front end of a plastic bag packaging groove of the sealing, cutting and thermal shrinkage all-in-one machine and blows air into a plastic bag space for packaging the plastic cups. The first conveying mechanism, the second conveying mechanism, the limiting mechanism, the pushing mechanism, the sealing, cutting and thermal shrinkage all-in-one machine, the blowing mechanism and the packaging bag printing machine are all connected with and controlled by a controller. The small-package plastic cup packaging machine solves the problems that existing small-package plastic cups are slow in packaging speed and low in efficiency.

The invention provides a rigid-flexible metal-organic framework diaphragm with high selectivity as well as a preparation method and application of the rigid-flexible metal-organic framework diaphragm. Through a seed secondary growth strategy, the problems that MOF particles are easy to fall off and are incompatible with a substrate film are successfully avoided. On one hand, grain seeds embedded in the polyvinylidene fluoride (PVDF) substrate film in advance provide stable anchoring points for growth of MOF, and MOF particles are not prone to falling off due to the high adhesive force of the grain seeds. The high Young modulus of the MOF crystal also effectively improves the thermal shrinkage resistance of the diaphragm, the excellent flexibility of PVDF is complementary with the diaphragm in mechanical property, and the battery diaphragm shows excellent mechanical property and thermal stability due to the rigid-flexible combination strategy. The invention provides an efficient diaphragm construction strategy for developing a lithium metal battery with long cycle life and high safety, and shows a wide application prospect in a next-generation high-safety battery.

The invention provides an ultrahigh-temperature ceramic precursor, a preparation method thereof, a modified high-performance inorganic fiber and application, and relates to the technical field of high-temperature-resistant materials. The preparation of the ultra-high-temperature ceramic precursor comprises the following steps: placing a transition metal compound mixed solution in a low-temperature environment, standing, adding a coordination agent and an exchange agent, reacting, filtering in a low-temperature nitrogen atmosphere, adding a mixed solvent into the filtrate, heating and refluxing, and carrying out a polymerization reaction to obtain the ultra-high-temperature ceramic precursor. The superhigh-temperature ceramic precursor provided by the invention forms a high-temperature protective coating on the surface of a high-performance inorganic fiber and other materials, and meanwhile, a transition metal ion solution is placed under a low-temperature condition through a metal ion stabilization method, so that the internal structure of transition metal ions is more stable, and uniform dispersion at a molecular level is achieved; and the uniformity of the elements can be kept in the curing and cracking processes, and the phenomenon of coating stripping caused by mismatching of thermal shrinkage coefficients of a coating and a substrate material in an extreme environment is avoided.

According to the lithium ion battery diaphragm slurry, the diaphragm and the lithium ion battery disclosed by the invention, a furyl polyamide solution and ceramic powder are mixed to obtain a cortex solution, and furyl polymers have relatively high mechanical properties, so that the mechanical properties of the diaphragm prepared by subsequent coating can be improved. The hollow furyl polyamide nanofiber is prepared from the skin layer solution and the core layer solution, the ceramic particles are added in the process of preparing the hollow fiber instead of mixing the prepared hollow fiber with the ceramic particles, the ceramic particles can be dispersed on the surface and inside the hollow fiber, agglomeration of the ceramic particles is avoided, and the hollow fiber is prepared. The preparation method has the advantages that the dispersion degree of furyl molecular chains is increased, the dispersion degree of the slurry is high, and meanwhile, the surface area of the slurry in contact with the diaphragm during subsequent coating can be increased due to generation of hollow fibers, so that the wettability of the diaphragm to electrolyte is effectively improved, and the heat resistance of the diaphragm is higher and the thermal shrinkage rate is lower.

The invention provides a modified negative pole piece, a battery and a battery system. The modified negative pole piece comprises a negative current collector; the modified active material layer is arranged on the surface of at least one side of the negative electrode current collector; the modified active material layer comprises an active material layer and a surface modification layer which are arranged in a laminated manner along the direction far away from the negative electrode current collector; the surface modification layer comprises at least two sub-modification layers, each sub-modification layer comprises a binder and a fast ion conductor electrolyte, and the content of the binder in the sub-modification layers is gradually reduced along the direction far away from the negative electrode current collector. On one hand, the infiltration state of the pole piece in the battery can be improved, the diffusion path of lithium ions can be shortened, the problem of stripping or falling of the active substance layer on the pole piece can be improved, and the structural stability of the battery can be improved, so that the rate capability and the cycle performance of the battery can be improved; the safety performance of the battery is improved and the overall cost of the battery is reduced.

The present application relates to the technical field of separator material preparation, and specifically relates to a microporous membrane, and a preparation method therefor and an application thereof. The microporous membrane comprises a polymer and an ionic liquid. Based on the total mass of the microporous membrane, the microporous membrane comprises 0.01 wt% to 5 wt% of the ionic liquid, optionally 0.1 wt% to 5 wt% of the ionic liquid. In the present application, an appropriate amount of the ionic liquid is introduced into the microporous membrane, and the ionic liquid can be continuously or discontinuously adsorbed on the surfaces of fibers in the microporous membrane. The ionic liquid is adsorbed on the surfaces of the fibers in the microporous membrane by means of a lipophilic end of the ionic liquid, thereby eliminating internal static electricity, also better reducing the reduction of ionic conductivity, increasing the migration speed of ions in an electrolyte, and reducing lithium dendrites. When the microporous membrane of the present application is used as a battery separator, an appropriate amount of the ionic liquid is added into the microporous membrane, so that the problem of electrostatic accumulation of the microporous membrane can be alleviated, and the microporous membrane has relatively low thermal shrinkage, avoiding problems such as affecting battery capacity, electrochemical safety.

The invention discloses reel uniform thermal shrinkage packaging equipment and a packaging method thereof, and belongs to the technical field of thermal shrinkage film packaging, the reel uniform thermal shrinkage packaging equipment comprises a rack, a feeding conveying line, a film wrapping conveying line, a discharging conveying line and a support, and the feeding end and the discharging end of the film wrapping conveying line are each provided with a 90-degree turnover mechanism used for switching the vertical placement posture and the horizontal placement posture of a wire reel; the lower end of the support is provided with a film-supporting heat-sealing cutting mechanism. A cuff inward folding auxiliary thermal shrinkage mechanism is arranged in a heating cavity of the thermal shrinkage furnace and comprises a lifting assembly, inward folding assemblies and a cuff hot air spray head, in this way, a welding wire reel enters the thermal shrinkage furnace and is lifted and lifted by the lifting assembly, the inward folding assemblies on the two sides are close to cuffs, and therefore the welding wire reel can be folded inwards. The sleeve opening is folded towards the axis direction of the wire reel in a rotating mode, and the sleeve opening hot air spray head blows hot air to the bent sleeve opening, so that the temperature of the sleeve opening is higher, the wire reel is evenly coated with the heat shrinkage film, and the wire reel can be completely coated with the heat shrinkage film under the condition that the width of the heat shrinkage film is smaller.

The invention relates to the technical field of aluminum profile packaging, in particular to a full-automatic aluminum profile packaging machine. According to the technical scheme, the full-automatic aluminum profile packaging machine comprises a thermal shrinkage packaging machine and further comprises a rear film coating assembly and a front film coating assembly; a rear film wrapping assembly is arranged on one side of the heat shrinkage packaging machine. A front film coating assembly is arranged on one side of the rear film coating assembly; the rear film wrapping assembly comprises a rear conveyor, a lifting lead screw, a lower film pressing conveying belt set, an upper film pressing conveying belt set, a lifting frame, a cutter driving air cylinder, a waste film cutting cutter and a film pressing wheel. The lifting frame and the lower film pressing conveying belt set and the upper film pressing conveying belt set which are connected with the lifting frame are adjusted through the lifting lead screw to integrally ascend and descend, and therefore the front end edge of a thermoplastic packaging film can be adjusted to completely wrap a sectional material during heat sealing; therefore, the problem that the film wrapping the profile is broken or excess materials are too long during hot cutting and edge sealing due to the fact that the film pressing height cannot be adjusted is solved.

The invention relates to the field of waterproof coiled material production equipment, in particular to a waterproof coiled material packaging machine which comprises a frame body provided with a film covering position. The packaging film conveying mechanism is arranged on the frame body and is used for conveying a packaging film to one side of the feeding end of the film laminating position; the feeding mechanism is arranged on the frame body and is used for conveying the waterproof coiled material to the film covering position; the hot melting cutting mechanism is arranged on the frame body in a lifting mode and located between the packaging film conveying mechanism and the film covering position. The thermal shrinkage chamber is arranged on the frame body and located on one side of the discharging end of the film covering position. The thermal shrinkage supporting balls are arranged in the thermal shrinkage chamber, and the number of the thermal shrinkage supporting balls is four; the two groups of lifting mechanisms are arranged in the thermal shrinkage chamber and are respectively arranged above and below the thermal shrinkage supporting balls; the upper and lower surface thermal shrinkage assembly is arranged at the output end of the lifting mechanism; and a rapid cooling mechanism is also arranged in the thermal shrinkage chamber. The problem that a packaging film is prone to wrinkling due to rolling, large supporting area and the like during thermal shrinkage is solved.