153 results about "Propylene carbonate" patented technology

The invention discloses a preparation method of a piezoelectric response type hybrid ceramic membrane, which is characterized in that polyvinylidene fluoride powder is used as a base material of the membrane, propylene carbonate or ethylene carbonate is used as a diluent, negative-voltage-loaded piezoelectric ceramic modified nanoparticles are doped, and a proper amount of inorganic piezoelectric nanoparticles are doped, so that the electrical property of the pressed membrane is remarkably improved; a negative charge group introduced to the surface of the membrane through surface grafting is combined, so that the relative content of beta crystal forms of the polyvinylidene fluoride membrane is increased, and finally efficient interception and excellent anti-pollution effects on humic acid are achieved.

The invention relates to the technical field of organic silicon catalysis, and discloses a hydrosilylation reaction catalyst and a preparation method thereof, the catalyst is prepared from a platinum complex catalyst solution, maleic anhydride, triphenyl borate, tetraethoxysilane, propylene carbonate and diethylene glycol dibutyl ether; the preparation method comprises the steps of solvent water removal, electronic relay adduct preassembly, active metal introduction, thermal induction aging and the like. An electron-deficient coordination center is constructed through a step-by-step process, the electron cloud density of the platinum center is reduced by utilizing the Lewis acid characteristic of triphenyl borate, and the solvent cage effect of propylene carbonate is matched, so that the high-temperature tolerance of the catalyst is improved, and the generation of platinum black is effectively inhibited; meanwhile, the solubilizing and bridging effects of diethylene glycol dibutyl ether are utilized, the compatibility problem of a high-polarity component and a non-polar silicone oil matrix is solved, and the obtained catalyst has high activity, high regioselectivity and excellent long-term storage stability.

The application relates to the technical field of catalysts, and discloses a limited type iodine-based homogeneous immobilized catalyst as well as a preparation method and application thereof. The catalyst comprises a carrier and iodine ions, magnesium ions and quaternary ammonium ions loaded on the carrier, wherein the molar ratio of the magnesium ions, the quaternary ammonium ions, the iodine ions and the carrier is 0.01-1:4-15:1-30:1. The limited type iodine-based homogeneous immobilized catalyst disclosed by the application enhances the electrostatic interaction between iodine ions and quaternary ammonium ions through the molecular sieve limiting effect to construct a limited type structure. The catalyst has significantly enhanced CO2 adsorption and activation capacity, can activate an epoxide compound, and accelerates the ring opening of the epoxide compound. In a cycloaddition reaction catalyzed by the catalyst under the conditions of no solvent and no auxiliary agent, the conversion rate of propylene oxide can reach more than 73%, and the propylene carbonate selectivity can reach more than 85%.

The application provides a method for inkjet printing of oligonucleotides, and belongs to the technical field of in-situ synthesis of oligonucleotides.The method comprises the following steps: modifying the surface of a solid carrier with a chemically active functional group; depositing oligonucleotide synthesis reagents onto the surface of the modified solid carrier by inkjet to perform in-situ synthesis; and the solvent in the oligonucleotide synthesis reagents comprises one or two of glutaronitrile, acetonitrile and propylene carbonate.The application uses a new type of difficult-to-vaporize solvent, greatly reduces the volatilization of reagents during inkjet synthesis and the generation of organic vapors during synthesis, and thus maintains a high in-situ synthesis reaction efficiency of oligonucleotides.

The present invention relates to electrochemical devices and electronic devices. Specifically, the present invention provides an electrochemical device comprising a cell, the cell comprising a positive electrode, a negative electrode, an electrolyte, and a separator, the outermost electrode of the cell having a curved portion and a straight portion, the straight portion having a length L mm and a radius D mm, where L / D is 5≦L≦10, the electrolyte containing propylene carbonate, and the propylene carbonate content A % based on the mass of the electrolyte, where A % is 5≦A≦15. The electrochemical device of the present invention has significantly improved room temperature cycle performance.

The application relates to the technical field of catalysts, and discloses a nano magnesium oxide material and a preparation method and application thereof. The nano magnesium oxide material has a porous structure, wherein the particle size of the nano magnesium oxide is 20-200 nm; and the pore size of the porous structure is 5-45 nm. The classical nucleation growth process of the magnesium oxide is directionally adjusted in a weak alkaline nucleation system, and then the nano magnesium oxide with a controllable grain size distribution is obtained. The nano magnesium oxide material has good catalytic activity in the synthesis of propylene carbonate from CO2 and an epoxide under the conditions of no solvent and no auxiliary agent, and the catalyst is not deactivated after multiple uses, and has good stability.

The invention provides an electrolyte, a lithium iron manganese phosphate battery and an electric device. The electrolyte comprises a lithium salt and a solvent, the solvent comprises ethylene carbonate, propylene carbonate, ethyl methyl carbonate, fluorobenzene and a low-viscosity solvent in a volume ratio of (2-5): (2-5): (3-5): (3-5): (2-5). The high dielectric constants of ethylene carbonate and propylene carbonate improve the dissolving capacity of the electrolyte to lithium salt, and meanwhile, the molecular structure can form a stable interface layer on the surface of a positive electrode to inhibit migration and dissolution of manganese ions; due to the low viscosity characteristic of the low-viscosity solvent, the overall viscosity of the electrolyte is reduced, and the permeability of the porous positive electrode material is enhanced, so that the wettability is improved, and uniform de-intercalation of lithium ions is promoted; a physical adsorption protection layer can be formed on the surface of the positive electrode through the coordination effect of high-electronegativity fluorine atoms in fluorobenzene and manganese, and direct contact between manganese and electrolyte is further blocked.

An object of the present disclosure is to provide a nonaqueous electrolytic solution and a lithium ion secondary battery using same, the nonaqueous electrolytic solution having both excellent battery safety when used at a high temperature, an important feature for secondary batteries to be installed in modern vehicles such as electric vehicles, and having excellent battery characteristics. The nonaqueous electrolytic solution of the present disclosure is a nonaqueous electrolytic solution including an electrolyte salt dissolved in a nonaqueous solvent, the nonaqueous solvent containing from 80 to 100 vol % in total of at least one selected from ethylene carbonate, propylene carbonate, and γ-butyrolactone, and the nonaqueous electrolytic solution further including a trifluoroacetic acid ester having an alcohol group with a carbon chain length of from 6 to 8.

The invention discloses a bio-based electrophoretic paint cross-linking agent composition S1. The bio-based electrophoretic paint cross-linking agent composition S1 comprises the following components: a bio-based polyol component; an isocyanate component; the catalyst comprises an organic bismuth or zinc catalyst; the solvent comprises propylene glycol methyl ether acetate or bio-based propylene carbonate. The electrophoretic paint cross-linking agent composition S2 comprises the following components: a cyclic carbonate monomer; a polyene polyamine; a thiol-ene click chemical reagent; an end-capping reagent and an organic tin catalyst component. An electrophoretic paint composition is prepared from the bio-based electrophoretic paint cross-linking agent composition. The invention provides a polyisocyanate cross-linking agent taking castor oil and bio-based polycarbonate diol as raw materials and a carbamate cross-linking agent prepared from cyclic carbonate and polyene polyamine, and the polyisocyanate cross-linking agent and the carbamate cross-linking agent have the following advantages that the bio-based content is greater than or equal to 60%, and the consumption of petroleum resources is reduced; the curing temperature is not more than 140 DEG C; vOC emission is reduced by more than 30%; and the adhesion, salt fog resistance and other properties of the coating reach or exceed those of a traditional system.

The invention discloses a surface protection layer of an ultrathin lithium strip as well as a preparation method and application of the surface protection layer, and belongs to the technical field of lithium batteries. The surface protection layer is formed after lithium metal reacts with a composite additive, and the composite additive is composed of solid powder and an organic solvent; wherein the solid powder is selected from one or more of dialkyl dithiophosphate or metal fluoride; the organic solvent is selected from any one of dimethyl sulfoxide, formamide, butyrolactam, acetone, 1, 4-dioxane, tetrahydrofuran, trimethyl phosphate, triethyl phosphate and propylene carbonate. The electrochemical performance of the produced lithium strip with the surface protection layer is remarkably improved, large-scale production can be achieved on the premise that existing equipment is not transformed and technological processes are not increased by means of the preparation method, the technical advantages in cost and technology are achieved, and therefore the lithium strip with the surface protection layer has a good application prospect. The surface protection layer of the ultrathin lithium strip and the preparation method of the surface protection layer have good application prospects.

The application provides a low-temperature electrolyte, a positive electrode slurry and a low-temperature sodium ion battery, and belongs to the technical field of battery materials.The low-temperature electrolyte comprises sodium hexafluorophosphate, propylene carbonate, ethylene carbonate, dimethyl carbonate, methyl ethyl carbonate, fluoroethylene carbonate, 2,2,3,4,4,4-hexafluorobutyl acrylate and 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether.The battery comprises the low-temperature electrolyte.The low-temperature electrolyte and the low-temperature sodium ion battery can not only be compatible with blended positive electrode materials, but also take into account the low-temperature performance, ensure that the prepared low-temperature sodium ion battery has good reaction kinetics and cycle performance, and can also improve the energy density of the electrode and reduce the powder resistivity.

Lithium-ion battery, characterized in that it consists of a cathode, an anode and a non-aqueous electrolyte; wherein the cathode comprises a cathode material layer containing an active cathode material, wherein the active cathode material comprises a compound represented by formula (A): Li x Ni a Co b M' 1-a-b O 2-y A y Formula (A) where in formula (A) -0.1 ≤ x ≤ 0.2, 0.8 ≤ a < 1, 0 ≤ b < 0.2, 0.8 ≤ a + b < 1, 0 ≤ y < 0.2 hold; where M' comprises one or both of the elements Mn or Al and zero, one or more of the elements Sr, Mg, Ti, Ca, Zr, Zn, Si, Fe, B, Ga, Cr, W, V, Nb and Ce; where A comprises one or more of S, N, F, B, Cl, Br and I; wherein the anode comprises an anode material layer containing an active anode material, wherein the active anode material comprises a silicon-based material; wherein the non-aqueous electrolyte comprises a lithium salt and an organic solvent, wherein the organic solvent comprises cyclic carbonate, and wherein the cyclic carbonate comprises fluorinated ethylene carbonate and propylene carbonate; where the lithium-ion battery meets the following conditions: 0.2 ≤ S / F ≤ 2 ,0 ,2 ≤ P / F ≤ 3 ,5 and 3 ≤ S ≤ 15 ,2 ≤ F ≤ 15 ,2 ≤ P ≤ 25 , 15 ≤ C ≤ 40; where S denotes the mass fraction of silicon in the anode material layer, expressed in wt.%; where F denotes the mass fraction of fluorinated ethylene carbonate in the non-aqueous electrolyte, expressed in wt.%; where P denotes the mass fraction of propylene carbonate in the non-aqueous electrolyte, expressed in wt.%; where C denotes the mass fraction of cyclic carbonate in the non-aqueous electrolyte, expressed in wt.%.

The invention discloses a reaction system and a reaction process for preparing propylene carbonate by a urea method, and relates to the technical field of chemistry and chemical engineering. The reaction system comprises a primary reaction system, a secondary reaction system and a final reaction system which are sequentially connected, the primary reaction system comprises a first reaction kettle and a first flash tank, the secondary reaction system comprises a second reaction kettle and a second flash tank, and the final reaction system comprises a third reaction kettle and a third flash tank; a baffle plate is arranged in the first reaction kettle, a spray nozzle is arranged in the second reaction kettle, a rotating plate is arranged in the third reaction kettle, and the rotating plate is coaxially connected with a stirrer in the third reaction kettle. The reaction process comprises the steps of primary reaction, secondary reaction and final reaction. The method can effectively remove ammonia gas generated in the process reaction, realizes continuous production of propylene carbonate, and is high in process yield, simple in equipment, clear in process and beneficial to large-scale production.

The invention discloses a catalytic synthesis method of propylene carbonate, belongs to the technical field of synthesis of propylene carbonate, and aims to solve the technical problem that the conversion rate and selectivity of propylene carbonate prepared by catalyzing a reaction of 1, 2-propylene glycol and carbon dioxide and the cyclic regeneration stability of a catalyst need to be further improved in the prior art. The method specifically comprises the following steps: adding 1, 2-propylene glycol and a cyclization catalyst into a high-pressure reaction kettle, stirring, introducing inert gas into the high-pressure reaction kettle, replacing and removing air in the high-pressure reaction kettle, and heating the high-pressure reaction kettle to 115-125 DEG C; according to the present invention, the epoxy silane-ionic salt is introduced after the activated carbon carrier is pretreated, and the highly dispersed immobilized Lewis acid center is introduced by using the tetraethoxysilane sol-gel, such that the conversion rate and the selectivity of the catalytic preparation of the propylene carbonate are effectively improved, and the performance stability of the cyclization catalyst during the cycle use is improved.

This invention relates to the field of battery technology, specifically to a battery. The battery includes a positive electrode and an electrolyte. The positive electrode includes a positive current collector and a positive active layer. The positive active layer includes a ternary material, which comprises secondary particles interwoven from primary particles. The aspect ratio of the primary particles is 1.5-20. The ternary material has a hollow structure with internal cavities, and the area of ​​the cavities accounts for 5%-40% of the cross-section of the ternary material. The weight ratio of linear solvent to cyclic solvent in the electrolyte is 3-15. The cyclic solvent includes at least one of ethylene carbonate and propylene carbonate, and the weight percentage of the cyclic carbonate in the electrolyte is 8%-20%. The weight percentage of ethylene carbonate in the electrolyte is 0 < S1 ≤ 10%. The battery of this invention, through the synergistic effect of a specific ternary material structure and a specific electrolyte, enables the battery to possess both high low-temperature power performance and high cycle performance.

The application relates to the technical field of batteries, in particular to an electrolyte suitable for primary lithium-manganese batteries and a preparation method thereof. The electrolyte comprises propylene carbonate, ethylene carbonate, lithium bisfluorosulfonylimide, lithium perchlorate, lithium bisoxalate borate, terminal bisdifluorophosphorylated oligomeric trimethylene carbonate, ethylene glycol dimethyl ether, lithium difluorooxalate borate and 1,3-propane sultone. The electrolyte is prepared through a pre-coordination and segmented dilution process with specific timing. The electrolyte system can synergistically optimize the electrode interface film forming process, has high discharge capacity retention rate and low direct current resistance at low temperature (-20 DEG C), and has high capacity retention rate after high-temperature storage (60 DEG C), thereby significantly improving the comprehensive performance of the primary lithium-manganese battery in a wide temperature range.

Provided are an electrolyte and a secondary battery. The electrolyte includes a lithium salt and a solvent. The solvent includes ethylene carbonate, propylene carbonate, fluorinated ethylene carbonate, and linear carbonate. A mass percentage of the ethylene carbonate relative to the solvent is 2% to 10%. A sum of a mass of the propylene carbonate and the fluorinated ethylene carbonate relative to the mass percentage of the solvent is 10% to 30%. The electrolyte may well match batteries with high working voltage, while ensuring that the initial impedance of the battery does not deteriorate, effectively improving the issues of poor cycle performance and large cycle gas generation of the battery.

This invention discloses a sodium-ion battery electrolyte, belonging to the field of sodium-ion battery technology, comprising an organic solvent, a sodium salt, and additives; the organic solvent includes ethylene carbonate, propylene carbonate, methyl ethyl carbonate, and ethyl acetate; the sodium salt includes sodium hexafluorophosphate and sodium difluorosulfonylimide; the additives include fluoroethylene carbonate, vinylene sulfate, sodium difluorophosphate, sodium difluorooxalate borate, and tris(trimethylsilane)phosphate. The sodium-ion battery electrolyte of this invention, through precise adjustment of the solvent and sodium salt ratio, maintains high conductivity at extremely low temperatures, significantly raising the lower limit operating temperature of the battery to -70°C. Simultaneously, through the synergistic effect of the sodium salt and additives, a high-temperature resistant SEI film rich in inorganic components is formed, reducing side reactions at high temperatures and raising the upper limit operating temperature of the battery to 85°C, achieving a wide temperature range application of the battery from -70°C to 85°C.

The invention discloses a wide-temperature-range electrolyte and application thereof, and belongs to the technical field of supercapacitors. The wide-temperature-range electrolyte comprises the following components in percentage by mass: 12.5%-15% of lithium salt, 0.3%-1% of [2, 2 '-dinaphthalene]-7-yl trifluoromethanesulfonate, 0.5%-1.5% of a sulfur additive, 0.5%-1% of a lithium salt additive and the balance of an organic solvent, by taking the total volume of the organic solvent as 100%, the volume ratio of the 2-bromo-5-fluoroisonicotinic acid methyl ester to the total volume of the ethylene carbonate and the propylene carbonate to the diethyl carbonate to the ethyl methyl carbonate is (5-10): (10-15): (10-20): (50-65). Experiments prove that by adding the methyl 2-bromo-5-fluoroisonicotinate and the functional [2, 2 '-dinaphthalene]-7-yl trifluoromethanesulfonate into the electrolyte, the high and low temperature discharge performance, especially the low temperature performance, of the supercapacitor can be remarkably improved, and the highest discharge capacity retention rate at-20 DEG C is 84.5%. Therefore, the wide-temperature-range electrolyte prepared by the method can solve the problem that a traditional supercapacitor electrolyte is difficult to consider high and low temperature performance at the same time.

The application provides a method for preparing a lithium metal composite negative electrode by electroplating, a lithium metal composite negative electrode and application thereof, wherein the method for preparing the lithium metal composite negative electrode comprises the following steps: providing an electroplating electrolyte, wherein the electroplating electrolyte comprises a first solvent and a lithium salt dispersed in the first solvent, and the first solvent is selected from at least one of acetonitrile, gamma-butyrolactone or propylene carbonate; and immersing an electrolyte composite electrode into the electroplating electrolyte, so that lithium ions in the electroplating electrolyte are deposited on the surface of the electrolyte composite electrode through an electroplating operation, thereby obtaining the lithium metal composite negative electrode. Through the synergistic effect of the first solvent and the electroplating operation, the application solves the problems of poor interface contact between the lithium metal negative electrode and the solid-state electrolyte and lithium dendrite growth, improves the safety and long cycle life of the battery under high-rate charging and discharging, and significantly improves the performance of the solid-state battery.

To provide a power storage device whose charge and discharge characteristics are unlikely to be degraded by heat treatment. To provide a power storage device that is highly safe against heat treatment. The power storage device includes a positive electrode, a negative electrode, a separator, an electrolytic solution, and an exterior body. The separator is located between the positive electrode and the negative electrode. The separator contains polyphenylene sulfide or solvent-spun regenerated cellulosic fiber. The electrolytic solution contains a solute and two or more kinds of solvents. The solute contains LiBETA. One of the solvents is propylene carbonate.

The invention relates to a method for producing a thermoplastic polyurethane powder by means of precipitation polymerisation. The method comprises i) providing a solvent mixture which contains at least one first aprotic solvent A1 having a relative permittivity εr between 2 and 20 (at 20 °C and 100 kHz) and a second aprotic polar solvent A2 from the group 1,2-propylene carbonate, gamma-butyrolactone or ethylene carbonate; ii) adding a polyol B having a molecular mass between 60 g / mol and 250 g / mol and a diisocyanate C; iii) reacting B and C in the solvent mixture A at a temperature of at most 150 °C, wherein the resulting polyurethane precipitates as a solid and forms a dispersion; iv) separating the solvent, washing the solid and drying to give the powder. The resulting powder has a molecular mass Mw of ≥ 35000 g / mol, an allophanate content of < 0.25 mol % and a proportion of > 25.0% of particles < 0.500 mm and satisfies a Mz : Mw ratio of < 4.0.

This invention provides an electrolyte and a lithium-ion battery containing the same. The electrolyte includes a solvent and additives. The solvent includes propylene carbonate (PC), which accounts for b wt% of the electrolyte by weight. The additives include fluorophosphate additives, which account for c wt% of the electrolyte by weight. The fluorophosphate additives have the structure shown in formula (I). The conductivity of the electrolyte at -30°C is a, in mS / cm. a, b, and c satisfy the relationship shown in formula (II): 2 ≤ (a × b) / c ≤ 10 (II). This application specifies that a, b, and c satisfy the relationship shown in formula (II) to improve lithium-ion transport kinetics while simultaneously improving the cycle stability of the lithium-ion battery and reducing the internal resistance of the lithium-ion battery. (I)

Disclosed is a rechargeable lithium battery including a positive electrode including a positive active material; a negative electrode including a negative active material; an electrolyte solution including a lithium salt and a non-aqueous organic solvent; and a separator between the positive and the negative electrodes, the separator including a porous substrate and a coating layer positioned on at least one side of the porous substrate. The negative active material includes a Si-based material; the non-aqueous organic solvent includes cyclic carbonate including ethylene carbonate, propylene carbonate, or combinations thereof, the cyclic carbonate being included in an amount of about 20 volume % to about 60 volume % based on the total amount of the non-aqueous organic solvent; and the coating layer includes a fluorine-based polymer, an inorganic compound, or combinations thereof. The rechargeable lithium battery has improved cycle-life and high temperature storage characteristics.

The present application provides a solid electrolyte containing an electrolyte solution containing a lithium salt and a carbonate-based solvent, and metal oxide particles. In the solid electrolyte, the lithium salt is at least one selected from lithium bis(fluorosulfonyl)imide and lithium fluoroborate, the carbonate-based solvent is at least one selected from dimethyl carbonate and propylene carbonate, the molar ratio of the lithium salt to the carbonate-based solvent (lithium salt / carbonate-based solvent) is 1 / 4 or more and 1 / 1 or less, the mass ratio of the electrolyte solution to the metal oxide particles (electrolyte solution / metal oxide particles) is 72 / 28 or more and 93 / 7 or less, and the specific surface area of the metal oxide particles, measured based on the BET method, is 160 m 2 / g or more and 700 m 2 / g or less.

A lithium secondary battery according to the present disclosure may comprise a positive electrode; a negative electrode; and an electrolyte comprising a lithium salt, an organic solvent, and an additive, wherein the organic solvent may comprise ethylene carbonate (EC) and propylene carbonate (PC), wherein the additive may comprise fluoroethylene carbonate (FEC), and a volume ratio of the propylene carbonate to the ethylene carbonate in the organic solvent may be 0.2 or more and less than 4.

The invention belongs to the technical field of cleaning agents, and discloses a heavy-duty cleaning agent as well as a preparation method and application thereof. The problem that an existing industrial cleaning agent cannot achieve high cleaning capacity and safety and environmental protection at the same time is effectively solved. The cleaning agent comprises the following components in percentage by mass: 20-35% of dipropylene glycol monomethyl ether; 20%-30% of D-limonene; 5%-15% of propylene carbonate; 8%-15% of alkyl glycoside; 3%-8% of isomeric tridecane alcohol ether; 0%-1% of monoethanolamine; 3%-8% of an alcohol conditioning agent, wherein the alcohol conditioning agent is isopropanol or ethanol; and the balance of deionized water. The cleaning agent can be used for cleaning PVC paste, cured resin, deposited carbon, grease and mixed oil sludge dirt attached to the surfaces of industrial equipment, mechanical parts, plastic molds, vehicle engines and the like. The cleaning agent has excellent heavy dirt cleaning capability, environmental protection and safety characteristics, material compatibility and use economy.

The invention relates to the technical field of batteries, in particular to a wide-temperature-range high-rate lithium battery ester-based electrolyte and application. The electrolyte comprises soluble lithium salt and a liquid component, the liquid component is a solvent; the solvent comprises at least three of propylene carbonate, fluoroethylene carbonate, isopropyl trifluoroacetate, ethyl trifluoroacetate, ethyl acetate, methyl acetate and methyl trifluoroacetate; the lithium salt lithium battery comprises at least two of common lithium salts. The electrolyte developed by the invention is used in the lithium battery and can stably work at 40-60 DEG C, the specific discharge capacity of the battery is still 62.83% of the specific discharge capacity of the battery at room temperature even at 30 DEG C and 4C multiplying power, and the electrolyte has excellent wide-temperature fast charge performance. In addition, the electrolyte effectively inhibits the growth of lithium dendrites and the side reaction of an electrode-electrolyte interface at low temperature, and promotes the formation of a solid interface film which is rich in inorganic matters and low in interface impedance. The invention has the advantages of reasonable component design and excellent product performance, and is convenient for industrial application.

This invention discloses a nano-oxygen barrier functional masterbatch for the outer surface of packaging bottles and its preparation method, belonging to the field of polymer packaging material technology. The method involves first homogenizing and ultrasonically dispersing nisin, glycerol, montmorillonite K10, and silver nanoparticles in an aqueous phase, then adding nanocellulose to obtain a hybrid oxygen barrier suspension. Next, polylactic acid, polypropylene carbonate, and triglycidyl isocyanate are melted and laterally injected into the suspension. The mixture is then subjected to twin-screw extrusion, vacuum devolatilization, and granulation to obtain the masterbatch. This masterbatch can form an oriented "brick-and-mortar" barrier structure in the matrix, enhancing interfacial bonding and the stability of the nano-silver, significantly improving the oxygen barrier, moisture barrier, peel strength, and long-lasting antibacterial properties of the packaging outer surface.

The invention discloses a method for purifying and modifying polypropylene carbonate based on supercritical CO2. The method is characterized by comprising the following steps: carrying out dry mixing on a polypropylene carbonate raw material and an amino-modified nano filler which accounts for 5-10wt% of the mass of the polypropylene carbonate raw material; adding the mixed material into a screw extruder through a feeder, controlling the operation temperature of the screw extruder to be 60-120 DEG C, injecting supercritical CO2 with the pressure of 8-30 MPa and the temperature of 40-120 DEG C into the middle rear end of the screw extruder, feeding the material treated by the screw extruder into a drop-type devolatilization device, controlling the cavity temperature of the drop-type devolatilization device to be 60-120 DEG C and the vacuum degree to be 20-80 kPa, and carrying out vacuum drying, so as to obtain the high-temperature-resistant low-temperature-resistant low-temperature-resistant low-temperature-resistant low-temperature-resistant low-temperature-resistant low-temperature-resistant low-temperature-resistant low-temperature- The method has the advantages that the content of the propylene carbonate is remarkably reduced, and meanwhile, the mechanical property and the thermal stability of the material are improved.