54 results about "Anti solvent" patented technology

The invention relates to the technical field of dendrobium officinale processing, and particularly discloses a method for realizing high value-added conversion of dendrobium officinale alkaloid based on efficient extraction. The method for realizing high value-added conversion of dendrobium officinale alkaloid based on efficient extraction comprises the following steps: S1, pretreatment and activation of raw materials: crushing dried dendrobium officinale stalks to 60-100 meshes to obtain dendrobium powder; mixing the dendrobium nobile powder with an activating agent aqueous solution to obtain activated wet dendrobium nobile powder; s2, deep eutectic solvent synergistic microwave extraction; s3, precipitation and enrichment of an anti-solvent; s4, cleaning and drying the precipitate; s5, preparing alkaloid nanoparticles; and S6, preparing the functional health-care product preparation. As a functional dietary supplement, the dendrobium officinale alkaloid solid beverage tablet or capsule provided by the invention can be used for daily health care, and has the advantages of high bioavailability, strong intestinal synergistic regulation function and good physical stability.

The invention discloses a preparation method of an anti-solvent extrusion granulation aluminum adsorbent. The preparation method comprises the following steps: preparing aluminum adsorbent precursor powder; dissolving an organic polymer in an organic solvent to form a polymer solution; dissolving the aluminum adsorbent precursor powder in the polymer solution to form slurry; and dripping the slurry into a flowing inorganic solvent so as to form the aluminum-based adsorbent particles through curing. The method has the advantages of simple preparation process, high adsorption capacity, high adsorption rate, stability, reliability, reusability and the like, can be directly used for extracting Li < + > from original brine in the technical field of lithium extraction from liquid-phase salt lakes, and has very high practical application value and popularization value.

This application discloses a method for preparing ultra-high purity citric acid monohydrate based on supercritical CO2, belonging to the field of citric acid preparation technology. The method includes the following steps: dissolving citric acid monohydrate in an organic solvent to prepare a citric acid solution; spraying the citric acid solution into a supercritical CO2 environment to crystallize the citric acid using the supercritical anti-solvent effect; performing dynamic washing with pure supercritical CO2; and obtaining ultra-high purity citric acid monohydrate crystals after depressurization and drying. The citric acid monohydrate product prepared by this method has high purity, high light transmittance, low total metal ion content, controllable crystal habit, and low organic solvent residue, meeting the stringent requirements of high-end applications such as electronic and pharmaceutical grades.

The application provides a bidentate phosphite polymer, a preparation method and application thereof, and a method for olefin carbonyl synthesis reaction. The bidentate phosphite polymer provided by the application is shown in formula (I) and is copolymerized by a specific bidentate phosphite ligand and 2-vinyl naphthalene. The bidentate phosphite polymer can be used in catalyzing the olefin carbonyl synthesis reaction, can not only ensure the catalytic performance of the olefin carbonyl synthesis reaction, but also can improve the solvent swelling resistance of the polymer, thereby being beneficial to ensuring the catalyst form stability and being beneficial to the stable production of aldehydes synthesized by the olefin carbonyl synthesis.

The invention belongs to the technical field of functional food and active substance delivery, and relates to EGCG (epigallocatechin gallate) loaded protein-polysaccharide ternary composite nanoparticles and a preparation method thereof. Zein is used as carrier protein, Arabic gum is used as stable polysaccharide, and an anti-solvent precipitation method is combined with ultrasonic treatment to prepare the composite nanoparticles. The preparation method specifically comprises the following steps: dissolving zein in an ethanol water solution to form an organic phase, dissolving Arabic gum in a water phase, adding the water phase into the organic phase under a stirring condition, removing ethanol to obtain a zein-Arabic gum binary composite nanoparticle dispersion liquid, introducing EGCG, and carrying out ultrasonic-assisted loading and drying to obtain a target product. The encapsulation efficiency of the active substance is improved through the ultrasonic-anti-solvent synergistic effect, the thermal stability and storage stability of the system are improved, and the method is simple, good in repeatability and suitable for delivery of food-grade active ingredients.

The invention is suitable for the technical field of intelligent testing, and provides an automatic testing method and system based on a water-alcohol-resistant solution, and the method comprises the steps: firstly responding to a water-alcohol-resistant solution test completion instruction, and obtaining first real-time index information and second real-time index information of a to-be-detected textile sample in real time; and according to the first real-time index information and the second real-time index information, water-alcohol-resistant effect evaluation information is effectively generated. According to the application, the water-alcohol solution resistance of various different fabrics can be accurately tested, so that the performance of the fabrics in contact with water and alcohol can be deeply known, a scientific basis can be provided for design and improvement of textiles and related products, experimental errors can be greatly reduced, and the experimental efficiency is improved. The stability and repeatability of test data are ensured, the optimization of the anti-solvent performance of the fabric is promoted, and the requirements of the market on high-quality durable textiles are met.

The application discloses a kind of preparation methods of lead-free environmental protection Cs2TiBr6 double perovskite film, it includes the following steps: CsBr powder and TiBr4 Powder are added to beaker equipped with gamma-butyrolactone solvent and magnetically stirred to be completely dissolved, then slowly add anhydrous acetonitrile as anti-solvent and constant temperature heating is placed on heating table, after seed microcrystal precipitates, pour out solution, use acetone to flush seed microcrystal after, and dry after standing;Seed microcrystal, CsBr powder and TiBr4 Powder are added to N, N-dimethylformamide solvent, and be loaded into centrifugal tube and centrifuged, pour out supernatant after centrifugation and the precipitate is dried, obtain Cs2TiBr6 microcrystal;Cs2TiBr6 microcrystal is added to the mixed solution of cyclohexane and isopropyl alcohol with certain mass ratio, and magnetically stirred to make microcrystal fully dispersed, obtain Cs2TiBr6 precursor solution;Cs2TiBr6 precursor solution is added dropwise to substrate and spin-coated, then the substrate is placed on heating table and annealed, to obtain Cs2TiBr6 film.The advantages are that, compared with existing film preparation technology, 1) no need of thermal evaporation coating machine and double source co-evaporation process, low cost and simple process;2) will not corrode substrate material;3) the thickness of prepared Cs2TiBr6 film is 8-10 μm, suitable for use in optoelectronic devices.

The application belongs to the field of organic photoelectric functional materials and devices, and particularly relates to a low-temperature cross-linking hole transport material and a synthesis method and application thereof. Two low-temperature cross-linking hole transport materials are successfully prepared by taking 9H-carbazole and 2,7-dibromo-9-butyl-9H-carbazole or 3,6-dibromo-9-butyl-9H-carbazole as raw materials. The two cross-linking hole transport materials have good thermal stability and solvent resistance and low cross-linking temperature. The two materials are applied to a QLED device hole transport layer, which significantly improves the current injection imbalance problem, improves the QLED efficiency, protects the original high charge transport performance of the hole injection layer, and promotes the rapid injection of holes.

The invention discloses a lutein ester purification method, and belongs to the technical field of lutein ester purification, the purification method comprises the following steps: S1, lutein ester is roughly dissolved in an organic solvent to prepare a crude product solution; s2, loading the crude product solution to a chromatographic column containing a composite adsorbent, carrying out gradient elution, and collecting an eluent; s3, concentrating the eluent to obtain concentrated slurry, adding an anti-solvent for crystallization, filtering, washing and drying; the composite adsorbent in the step S2 is composed of silica gel and macroporous adsorption resin; in the step S2, gradient elution is performed by sequentially adopting a first eluent and a second eluent, and the first eluent is petroleum ether and ethyl acetate in a volume ratio of (10-20): 1; the second eluent is petroleum ether and ethyl acetate in a volume ratio of (2-5): 1. The purity of the lutein ester is finally improved to 99% or above, and the yield is up to 85% or above.

This invention discloses a bismaleimide-modified polyaryletherketone (PAK) composition, its preparation method, and its applications, belonging to the technical field of polymer materials and high-temperature insulating coatings. The composition comprises a PAK polymer, a bismaleimide crosslinking agent, and a free radical catalyst. The PAK polymer backbone or side chains contain cyano functional groups that participate in the crosslinking reaction, and the bismaleimide crosslinking agent contains active maleimide functional groups, which react with the cyano groups of the PAK polymer backbone to form a slightly crosslinked network structure. The novel slightly crosslinked network polymer film prepared by this invention exhibits strong solvent resistance, excellent material processing properties, and superior insulation properties at high temperatures.

The embodiment of the application relates to a method for preparing perovskite quantum dots assisted by supercritical carbon dioxide, and belongs to the technical field of perovskite quantum dots. The method solves the problems of complex process of hot injection method, large amount of anti-solvent required by ligand assisted precipitation method and difficult size control. The specific steps include: 1) dissolving lead halide and ligand 1 in polar solvent 1 to form precursor solution A; 2) dissolving cesium halide and ligand 2 in polar solvent 2 to form solution B; 3) premixing solution A and supercritical carbon dioxide to be homogeneous; 4) adding anti-solvent 3 into the reaction kettle and introducing the homogeneous phase of solution A and supercritical carbon dioxide; 5) rapidly injecting solution B for reaction, and releasing pressure after crystal nucleation and growth; 6) collecting and purifying the product. The method is green and efficient, and the prepared perovskite quantum dots are suitable for the fields of optoelectronic devices, display and lighting, etc.

The triacetyl andrographolide nanocrystal is mainly composed of triacetyl andrographolide, a stabilizer and an excipient, and an average particle size of drug particles in a triacetyl andrographolide nanocrystal suspension obtained by redissolving the triacetyl andrographolide nanocrystal in water, is less than 500 nm, and a PDI is less than 0.2. The nanocrystal suspension is prepared from the triacetyl andrographolide and the stabilizer by a high-speed shear anti-solvent method in combination with a high-pressure homogenization method, then the excipient is added, and the nanocrystal is prepared through spray-drying.

The invention provides a crosslinkable polymer and application thereof, the crosslinkable polymer has a structure as shown in formula I. Through the structural design of a polymer skeleton constructed by aromatic rings with a specific structure, number and connection mode, the crosslinkable polymer has a proper HOMO energy level, high hole mobility and high triplet state energy level, and the molecular weight of the crosslinkable polymer is increased. As a hole transport material, the compound can significantly improve the luminous efficiency and the working life of an organic electroluminescent device, and reduce the voltage. The cross-linkable polymer can meet the requirements of a solution processing method, secondary cross-linking reaction can occur after film forming, a polymer film subjected to secondary cross-linking forms a three-dimensional network structure, the solubility is reduced, excellent hole transport performance is maintained, meanwhile, high solvent resistance is achieved, various solvent requirements of a next functional layer can be met, and the cross-linkable polymer can be widely applied to the field of organic light emitting devices. Therefore, the problem of mutual dissolution between the hole transport layer and the adjacent layer is solved, and the device is endowed with more excellent comprehensive performance.

The invention relates to the technical field of inorganic salt purification, and discloses high-purity ammonium sulfate and a preparation process thereof.The preparation process includes the following steps that firstly, a magnetic response macrocyclic ether complexing agent is added into an ammonium sulfate solution to be purified, the complexing agent can specifically capture impurities such as potassium ions, and a stable complex with magnetic responsiveness is formed; then, selectively crystallizing and separating out the target product ammonium sulfate under a mild condition by a gas-phase anti-solvent crystallization method, and meanwhile, effectively repelling a large-volume impurity complex into a mother solution. The key step is that obtained solid-liquid mixed crystal mush is introduced into a gradient magnetic field for enhanced separation. Through creative integration of molecular recognition, phase equilibrium engineering and a magnetochemical separation technology, the limitation of a co-crystallization effect is fundamentally broken through, and ultra-high-purity ammonium sulfate with extremely low impurity content can be prepared in an efficient and environment-friendly manner.

The application belongs to the technical field of perovskite quantum dot preparation, and particularly relates to a method for preparing perovskite quantum dots by using nano transient precipitation. The method comprises the following steps: dispersing A-site cation halide, B-site metal ion halide and a ligand of ABX3 type perovskite quantum dots in a polar solvent to obtain a precursor solution; and mixing the precursor solution and a non-polar anti-solvent by jet flow mixing to induce turbulent mixing, and obtaining the perovskite quantum dots after stopping. The preparation method provided by the application can be carried out at normal temperature and pressure, without the need for high-temperature heating and inert atmosphere protection, thereby avoiding the harsh reaction conditions of the hot injection method, and greatly reducing the process complexity and energy consumption cost. The jet flow mixing technology is used to realize efficient mixing in milliseconds, and the mixing time is shortened by 2-3 orders of magnitude compared with the traditional method, so that the transient uniform supersaturation of the precursor is ensured, thereby obtaining perovskite quantum dot products with narrow particle size distribution and excellent optical performance.

The invention discloses a circular polarization organic laser material and a preparation method and application thereof, and the preparation method of the circular polarization organic laser material comprises the following steps: taking chiral amine, rare earth chloride and hydrochloric acid as raw materials, placing the raw materials in a solvent, and heating for reaction to obtain a precursor solution; after drying the precursor solution, dissolving again to obtain a transparent solution; and putting the open container filled with the transparent solution into a closed container filled with an anti-solvent, and growing the zero-dimensional perovskite structure luminescent material A4BX7 single crystal by utilizing the diffusion of the anti-solvent. The chiral ligand is introduced into the hybrid perovskite, a chiral environment is successfully introduced into an inorganic perovskite system, chiral transfer is realized, and the prepared circular polarization organic laser material has good circular polarization organic laser properties and high fluorescence quantum yield.

The invention relates to the technical field of nylon 66 salt preparation, and provides a nylon 66 salt preparation method based on a microchannel reactor, which comprises the following steps: preparing an adipic acid suspension and a hexamethylenediamine solution, and heating the adipic acid suspension and the hexamethylenediamine solution to 50 DEG C; introducing the nylon 66 salt solution and the nylon 66 salt solution into a micro-channel reactor for neutralization reaction to obtain a nylon 66 salt solution; the micro-channel reactor comprises a constant-temperature pipe, and a spiral channel pipe is sleeved in the constant-temperature pipe; the method comprises the following steps: introducing a nylon 66 salt solution and an anti-solvent into a clash mixer to form a mixed solution in the mixer; introducing the mixed solution into a micro-channel crystallizer, and gradually crystallizing to form salt crystal slurry; and separating and drying the nylon 66 salt crystal slurry to obtain solid nylon 66 salt. Therefore, through the micro-channel reactor, the clash mixer and the micro-channel crystallizer, the contact area of reactants is increased, the reaction rate is further increased, and the water consumption and the evaporation energy consumption are effectively reduced. The production cost is reduced, and the production efficiency is improved.

The application discloses an alkali ion passivated non-lead perovskite light-emitting diode and a preparation method thereof, and belongs to the technical field of light-emitting diodes.The light-emitting diode comprises, from bottom to top, ITO conductive glass, a hole injection layer, a hole transport layer, a non-lead perovskite light-emitting layer, an electron transport layer, an electrode modification layer and a metal electrode.The application further provides a preparation method of the non-lead perovskite light-emitting diode.The non-lead perovskite light-emitting layer is prepared by an anti-solvent crystallization method from an alkali ion passivated non-lead perovskite precursor solution and an anti-solvent, and the alkali ion is introduced to inhibit non-radiative recombination loss in a surface and a grain boundary of the non-lead perovskite thin film, so that the light-emitting efficiency is enhanced, and the photoelectric performance of the non-lead perovskite light-emitting diode device is improved.

The invention discloses a crosslinkable hole transport polymer and application thereof in preparation of a photoelectric device. The polymer has a triarylamine unit, and a group with chemical reaction activity is introduced to a side chain of the polymer; chemically reactive groups of styrene, benzocyclobutene and substituents or derivatives thereof; the cross-linkable hole transport polymer can be cross-linked and cured under the mild conditions of heat, light, an initiator and the like, and then has good solvent resistance, another layer of film can be prepared on the cross-linkable hole transport polymer through solution processing, and a multi-layer solution processing device is achieved. The cross-linkable hole transport polymer also has high optical transparency, has large potential as a hole transport polymer, and can realize different energy levels and carrier mobility by adjusting the content of a polymerization unit. The method can be used for preparing the hole injection layer of the photoelectric device.

The invention relates to a method for extracting total flavonoids of litsea coreana, which comprises the following steps: step 1, pretreatment: crushing and sieving dried litsea coreana leaves to obtain litsea coreana powder; step 2, enzymolysis: adding the litsea coreana powder into a buffer solution, then adding a compound enzyme, and carrying out enzymolysis treatment; step 3, DES extraction: adding a deep eutectic solvent into the material subjected to enzymolysis for extraction, and centrifuging to obtain an extracting solution; and step 4, purification: adding an anti-solvent into the extracting solution to precipitate the flavonoid compound, centrifuging again, collecting the precipitate, washing with a detergent, and drying to obtain the total flavonoid extract of the litsea coreana. According to the method, organic solvents and high-temperature conditions are not used, under the condition that the temperature is controlled to be 60 DEG C or below in the whole process, the extraction rate of the litsea coreana is greatly increased, the shelf life of the litsea coreana flavonoid extract is prolonged, and the method is simple, easy to operate and convenient to apply and popularize and has good industrial prospects.

This invention belongs to the field of antibiotic raw material preparation, and provides a clindamycin phosphate raw material and its preparation method. The method first purifies a crude aqueous solution containing clindamycin phosphate using a bifunctional mesoporous silica adsorbent, then employs antisolvent crystallization induced by activated seed crystals, followed by drying to obtain the raw material. The obtained raw material has high purity, low total related substances (TLS) and low maximum single related substance (MSLS), controllable moisture content and particle size, and balances the engineering applicability and crystallization processability of granular fixed-bed packing. It alleviates the difficulties in balancing high-selectivity purification with fixed-bed compatibility, particle size processability, and high purity with low MSLS levels, and is suitable for the preparation and scale-up application of clindamycin phosphate raw materials.

Provided is a method to prepare a solid dispersion composition comprising an active pharmaceutical ingredient (API) and a pharmaceutically acceptable dispersion carrier, which includes (a) dissolving the API and the pharmaceutically acceptable dispersion carrier in a solvent to form a dissolved API / pharmaceutically acceptable dispersion carrier solution; and / or (b) combining the dissolved API / pharmaceutically acceptable dispersion carrier solution and an anti-solvent to form a combination, wherein the anti-solvent comprises a surfactant; and / or (c) mixing the combination to generate an emulsion with a predetermined mean particle size range; and / or (d) removing the solvent from the emulsion to generate the solid dispersion composition, wherein the solid dispersion composition has the predetermined mean particle size range. Preferably, the API in the solid dispersion composition is amorphous. Also provided is an emulsion and / or a solid dispersion composition comprising the API and a dispersion carrier. Also provided is a solid dispersion made by the methods of the invention. In embodiments, the present invention includes Compound (1), also known as zongertinib, and apparatus for continuous processing according to the methods disclosed herein.

The invention belongs to the technical field of medicinal chemistry and green chemical industry, and particularly relates to a green circulation method of rotundine resolution mother liquor. According to the method, the acid mother liquor generated after chiral resolution of rotundine (L-tetrahydropalmatine) tartaric acid is used as a raw material, separation and purification are not needed, the acid environment of the mother liquor is directly utilized, hydrogen peroxide is used as a green oxidizing agent, and the target product is obtained. The method comprises the following steps: oxidizing a residual tetrahydropalmatine mixture (including dextroisomer, unresolved racemate and lost levoisomer) in a mother solution into palmatine salt; then, an alkaline reducing agent is directly added into the reaction system without separation, the palmatine salt is reduced into racemic tetrahydropalmatine, meanwhile, the reducing agent or a hydrolysate of the reducing agent is neutralized with residual acid in the oxidation step, and self-adjustment of the pH of the system is achieved. According to the method, a post-treatment strategy of combining a one-pot method with a solvent devitrification resistance is creatively adopted, and the product is directly and efficiently separated out from a reaction system by simply adjusting pH and diluting, so that the process is greatly simplified. The method abandons the scheme of using expensive and toxic oxidants such as iodine or N-halogenated imide in the traditional process, has the remarkable advantages of low cost, environmental friendliness, high atom economy, short process flow and extremely small wastewater generation amount, and is very suitable for industrial production.

Provided is a method to prepare a solid dispersion composition comprising an active pharmaceutical ingredient (API) and a pharmaceutically acceptable dispersion carrier, which includes (a) dissolving the API and the pharmaceutically acceptable dispersion carrier in a solvent to form a dissolved API / pharmaceutically acceptable dispersion carrier solution; and / or (b) combining the dissolved API / pharmaceutically acceptable dispersion carrier solution and an anti-solvent to form a combination, wherein the anti-solvent comprises a surfactant; and / or (c) mixing the combination to generate an emulsion with a predetermined mean particle size range; and / or (d) removing the solvent from the emulsion to generate the solid dispersion composition, wherein the solid dispersion composition has the predetermined mean particle size range. Preferably, the API in the solid dispersion composition is amorphous. Also provided is an emulsion and / or a solid dispersion composition comprising the API and a dispersion carrier. Also provided is a solid dispersion made by the methods of the invention. In embodiments, the present invention includes Compound (1), also known as zongertinib, and apparatus for continuous processing according to the methods disclosed herein.

The application provides a preparation method of amorphous pomegranate-like nanocellulose, which comprises the following steps: dissolving cellulose in a specific solvent to form a cellulose solution with a concentration of 0.001 wt%-15 wt%, adding a hydrophobic modifier into the cellulose solution, hydrophobically modifying the dissolved cellulose to obtain a hydrophobic cellulose solution, mixing and diffusing the hydrophobic cellulose solution with an anti-solvent to make the hydrophobic cellulose self-assemble into primary particles through van der Waals force, reassembling the primary particles into amorphous pomegranate-like nanocellulose due to high surface energy, obtaining a suspension of the amorphous pomegranate-like nanocellulose, and finally completely removing the specific solvent and the hydrophobic modifier and drying to obtain the amorphous pomegranate-like nanocellulose. The application innovatively combines the dissolution, hydrophobic modification and regeneration of cellulose to prepare the amorphous pomegranate-like nanocellulose with novel biomimetic pomegranate-like structure.

The present disclosure relates to an electrolyte for a lithium secondary battery capable of improving initial discharge characteristics, lifespan characteristics, output characteristics, and the like of a lithium metal secondary battery, and a lithium metal secondary battery comprising the same. The electrolyte may include a lithium salt; a non-aqueous organic solvent; an organic anti-solvent, wherein the solubility of the organic anti-solvent to the lithium salt is 10 times or more lower than the solubility of the non-aqueous organic solvent to the lithium salt; and an additive comprising a fluorine-substituted ether compound.

A porous hollow fiber membrane based anti-solvent crystallization (AsCr) process is disclosed. The process involves injecting an anti-solvent from a bore of a hollow fiber membrane into a shell side where a feed solution containing a solution containing a material, e.g., an API, is flowing. The shell-side feed solution flows perpendicular to the hollow fiber length; the shell side liquid is in cross flow across the hollow fiber membranes. Multiple HFM modules may be positioned in series with nanocrystal suspension product from one module fed to the next module that is independently fed with an anti-solvent. The crossflow HFM based continuous AsCr technique disclosed herein could result in continuous nanocrystal production of APIs.

The invention relates to the technical field of adsorption materials, in particular to a functional polymer material for high-selectivity n-heptane adsorption separation and a preparation method of the functional polymer material. During preparation, hydroxypropyl-beta-cyclodextrin is used as a core raw material, polymerizable double bonds are introduced through in-situ esterification, and then the functional polymer material is prepared from hydroxypropyl-beta-cyclodextrin, perfluorooctyl ethyl acrylate and divinyl benzene through an emulsion dispersion-emulsion polymerization process. According to the material, impurities are included in a hydrophobic cavity of modified hydroxypropyl-beta-cyclodextrin, and the hydrophobic synergistic effect of a perfluoro side chain is combined, so that the impurities are adsorbed, and a three-dimensional network constructed by divinyl benzene can fix functional sites and inhibit swelling of chain segments. The functionalized polymer material for high-selectivity n-heptane adsorption separation is high in n-heptane separation selectivity, excellent in solvent expansion resistance and long-term stable in functional sites, the preparation process does not need special monomers, conditions are mild, large-scale production is easy, and the functionalized polymer material can be efficiently applied to n-heptane purification in the fields of petrochemical engineering and the like.

The invention belongs to the technical field of modified lignin, and discloses a preparation method and application of multifunctional modified lignin. The preparation method comprises the following steps: (1) mixing a wood fiber raw material with tannic acid, then adding an organic acid solution, and reacting under stirring and heating conditions; (2) after the reaction is finished, cooling to room temperature, filtering, and performing suction filtration by a vacuum pump to separate cellulose solid residues and lignin filtrate; and (3) precipitating the lignin filtrate into an anti-solvent for regeneration, centrifugally collecting precipitates for three times, freeze-drying, and vacuum-drying to obtain the modified lignin. Under mild conditions, efficient extraction, structure protection and function enhancement of lignin are synchronously realized, the obtained modified lignin becomes a multifunctional bio-based raw material due to the remarkably improved ultraviolet absorption capacity, antioxidant activity and tyrosinase inhibition, and the application of the modified lignin can be extended to multiple fields such as functional cosmetics, high polymer materials, food preservation and the like.

The invention relates to the technical field of perovskite thin films and perovskite solar cells, in particular to a mixed halide perovskite thin film for inhibiting ion migration and a preparation method and application thereof. The specific preparation method comprises the following steps: dispersing formamidine iodide, methyl ammonium bromide, PbBr2 and PbI2 in a solvent, and then mixing with a CsI solution to obtain a perovskite precursor solution; spin-coating the perovskite precursor solution on the surface of a substrate by adopting a two-step spin-coating process, and adding an anti-solvent in the second spin-coating process to obtain a film precursor; carrying out laser shock annealing treatment on the film precursor; and after laser shock annealing, forming the mixed halide perovskite thin film for inhibiting ion migration on the surface of the substrate. According to the method, ion migration in the mixed halide perovskite crystal can be effectively inhibited, so that the photoelectric property of the mixed halide perovskite is improved, and the problem that the efficiency and the stability of a device are reduced due to the ion migration of the mixed halide perovskite is solved.