473 results about "Acetic acid solution" patented technology

The invention discloses a preparation method of a bionic cornea stroma lens for refractive correction, which comprises the following steps: solution preparation: dissolving type I collagen in an acetic acid solution, adding a film aid, fully stirring, and centrifugally defoaming to obtain a type I collagen composite solution; the I-type collagen composite solution is poured into an assembling groove, the curvature radius of titanium metal is set to be 6.8-8.0 mm, the titanium metal serves as a working electrode material, platinum metal serves as a counter electrode material, current parameters are set according to the needed thickness of the lens blank, the density is 3.50-6.50 mA / cm < 2 >, and the thickness of the lens blank is set to be 3.50-6.50 mA / cm < 2 >; a high-transparency cornea embryo material which is uniform in curvature in all directions and similar to human cornea fiber structure arrangement is formed after electrochemical assembly and cross-linking curing, accurate cutting machining is carried out through excimer laser, a concave / convex matrix lens with the needed correction degree is obtained, the correction precision is high after cornea interlayer implantation, and the correction precision is high. And meanwhile, the compound has excellent performance in the aspects of in-vivo stability and biological safety.

The invention discloses a preparation method of a cell inflammatory factor adsorbent, which comprises the following steps: mixing styrene, divinyl benzene and hydroxyethyl acrylate, and adding a pore-foaming agent and mesoporous SiO2 nano powder to prepare a porous microsphere carrier; the preparation method comprises the following steps: mixing chitosan and poly (N-isopropylacrylamide) in an acetic acid solution to obtain a temperature-sensitive chitosan hydrogel precursor solution; the preparation method comprises the following steps: activating the surface of a porous microsphere carrier by using 1-ethyl-(3-dimethylaminopropyl) carbodiimide and N-hydroxysuccinimide, mixing the activated porous microsphere carrier and a temperature-sensitive chitosan hydrogel precursor solution to obtain a water phase, and assembling, washing and drying in an oil phase to obtain the cell inflammatory factor adsorbent. Through the design of the core-shell structure and the addition of the mesoporous SiO2 nano powder, the temperature response characteristic and the recyclable characteristic are given to the cell inflammatory factor adsorbent, the adsorption capacity of cell factors is also improved, and a new solution is provided for physical adsorption of the cell inflammatory factors.

The invention relates to a degradable composition and flame-retardant degradable plastic. The degradable composition comprises PLA particles, modified lignin and a bio-based flame retardant, wherein the modified lignin is obtained by grafting polycaprolactone on lignin and then forming a core-shell structure on the surface of silane coupling modified calcium carbonate; the preparation method of the bio-based flame retardant comprises the following steps: heating and dissolving chitosan in an acetic acid solution, introducing nitrogen, adding an initiator, then adding a DOPO derivative with double bonds at the tail end, MDO and AA, and carrying out a polymerization reaction to prepare the flame retardant. According to the scheme, the lignin-PCL / calcium carbonate core-shell toughening agent and the P-N synergistic chitosan flame retardant are prepared and are jointly added into the PLA, the compatibility with the PLA is good, the problem of high brittleness of the PLA can be effectively solved, the elongation at break is improved, meanwhile, the material is endowed with flame retardance, and the biodegradability of the PLA material can be well kept.

The invention discloses a pretreatment method for efficiently extracting calcium in shrimp and crab shells. The pretreatment method comprises the following steps: carrying out microwave treatment on the shrimp and crab shells until the weight is constant, rehydrating for 10 minutes in a water bath at 90 DEG C, carrying out microwave treatment until the weight is constant, crushing, mixing with an acetic acid solution, stirring, centrifuging, and measuring the calcium concentration. According to the method, through microwave-rehydration-secondary microwave pretreatment, the carapace structure is destroyed, the contact area of organic acid and calcium is increased, the calcium recovery rate is increased, the treatment time is shortened, the energy consumption is reduced, the universality of raw materials is enhanced, comprehensive utilization of resources is facilitated, and the method is environmentally friendly and economical.

The invention discloses a graphene oxide-chitosan-carboxymethyl cellulose composite aerogel and an application of the graphene oxide-chitosan-carboxymethyl cellulose composite aerogel in adsorption of amaranth. The preparation method comprises the following steps: mixing a carboxymethyl cellulose aqueous solution with a chitosan acetic acid solution, adding gallic acid, stirring until the gallic acid is completely dissolved, adding the graphene oxide dispersion liquid, and stirring until a system forms uniform and stable gel; the gel is firstly subjected to ultralow-temperature freezing and then subjected to freeze drying, and finally the graphene oxide-chitosan-carboxymethyl cellulose composite aerogel is obtained. The aerogel prepared by the method is environment-friendly and stable in pore structure, and is a composite aerogel material with high adsorption capacity and good regeneration performance on anionic dyes. The adsorption capacity of the aerogel to amaranth can reach 125 mg / g, the adsorption rate is still kept at 77% after the aerogel is recycled for 3 times, and the aerogel is suitable for efficient treatment of dye wastewater.

The invention relates to the technical field of multifunctional composite materials, in particular to wave-absorbing, photo-thermal and deicing integrated carbon aerogel and a preparation method thereof. The wave-absorbing, photo-thermal and deicing integrated carbon aerogel is characterized by comprising the following raw materials: 5-15 parts of a dominant bio-based material; 3-10 parts of an auxiliary bio-based material; 0.5 to 3 parts of cobalt salt; 1-5 parts of a photo-thermal material, namely an MXene material; a dispersion medium: 40-80 ml of a 1% v / v acetic acid solution; the concentration of the photo-thermal material dispersion liquid is 0.5 mg / mL to 2 mg / mL, and the concentration of the photo-thermal Compared with the prior art, the wave-absorbing, photo-thermal and deicing integrated carbon aerogel and the preparation method thereof have the advantages that through the collaborative design of a bio-based framework and MXene, the problems of function splitting, non-uniform photo-thermal material loading and insufficient wave-absorbing strength of an existing material are solved, collaborative fusion of photo-thermal deicing and wave-absorbing functions is realized, and the wave-absorbing performance of the wave-absorbing, photo-thermal and deicing integrated carbon aerogel is improved. The method is suitable for extreme environment protection scenes such as aerospace and wind power equipment.

The invention relates to a method for recovering lithium and fluorine from aluminum electrolysis hazardous waste, which comprises the following steps: firstly, mixing organic polyol and alkaline hydroxide according to a molar ratio of 1: (0.5-2) to obtain a eutectic solvent; heating the eutectic solvent to 80-150 DEG C, and adding a proper amount of raw material fine powder and calcium oxide for reaction leaching; carbonating and filtering the leachate to obtain lithium carbonate; washing the leaching residues with an acetic acid solution to obtain a calcium fluoride product; the concentration of fluorine ions in the leachate is smaller than or equal to 200 ppm, and the purity of calcium fluoride is larger than or equal to 90%; the leaching rate of lithium in the method is greater than 85%; the slag feeding rate of fluorine is greater than 95%; and no hydrogen fluoride gas is generated in the method. According to the method, a non-toxic and biodegradable eutectic solvent is adopted as a leaching agent, and efficient leaching of lithium and fluorine in the aluminum electrolysis dangerous waste materials is achieved; calcium oxide is used as a precipitating agent, free fluorine is promoted to be precipitated and recycled as calcium fluoride, the whole process meets the requirement of green metallurgy, and the win-win situation of resources and the environment is achieved.

The application discloses a kind of nano magnetic flocculants and its preparation method and application, belong to drinking water processing technical field, including the following steps: step S1, modified ferroferric oxide nanosphere is ultrasonically dispersed in ammonia alcohol solution, while stirring, slowly drop adding tetraethyl orthosilicate, continue stirring after drop, after centrifugal separation, wash, obtain silica coated ferroferric oxide nanoparticles;Step S2, phenylalanine modified chitosan is added into glacial acetic acid solution, after completely swelling and dissolving, add silica coated ferroferric oxide nanoparticles and ultrasonic treatment, under low pressure ultraviolet lamp, then with anhydrous ethanol wash purification, vacuum drying to constant weight, obtain nano magnetic flocculants;The method of the application is simple and easy to operate, the nano magnetic flocculants prepared can be quickly adsorbed to the surface of sulfonamide antibiotics, produce flocculation and can be magnetically separated, very suitable for trace sulfonamide antibiotics in drinking water source efficient removal.

The invention belongs to the technical field of water treatment, and particularly relates to a preparation method and application of a PDA / CS composite adsorbent loaded with a bimetallic system, and the preparation method comprises the following steps: 1) dissolving dopamine in a Tris buffer solution to prepare a dopamine prepolymer solution; then adding FeCl3, and carrying out constant-temperature water bath; centrifuging the obtained black suspension, performing suction filtration, washing, collecting a filter cake, and performing freeze drying to obtain PDA microspheres; 2) dispersing PDA microspheres in deionized water, and carrying out ultrasonic treatment until the PDA microspheres are uniformly dispersed; 3) dissolving chitosan in an acetic acid solution, and adding CuCl2 to prepare a mixed solution; the suspension obtained in the step 2 is dropwise added into a mixed solution for constant-temperature water bath, the pH of the mixed solution is adjusted through a NaOH solution, glutaraldehyde is added for constant-temperature water bath after constant-temperature water bath, and 4, the obtained suspension is subjected to centrifugation, suction filtration, washing, filter cake collection and freeze drying.

The invention discloses a method for measuring the content of calcium fluoride in dolomite-containing fluorite mine. The method comprises an acetic acid solution, a hydrochloric acid solution, a triethanolamine solution, a potassium hydroxide solution and boric acid. The method for measuring the content of calcium fluoride in the dolomite-containing fluorite mine comprises the following steps: S1, reagent proportioning; s2, preparing a calcium standard solution; s3, preparing an EDTA standard titration solution; s4, selecting an instrument; s5, preparing a sample; s6, step analysis; s7, content correction and determination; and S8, calculating a result. The invention belongs to the technical field of calcium fluoride content determination, and particularly relates to a method for measuring the content of calcium fluoride in dolomite-containing fluorite mine, compared with the prior art, the method solves the problem of dolomite dissolution when calcium carbonate is leached by acetic acid, and the content of calcium fluoride in the fluorite mine can be measured by accurately calculating the dissolution amount of dolomite. The measured calcium fluoride content is clearer, more reasonable and more reliable and approaches to a true value, and the process operation is simple and rapid, and is suitable for the requirements in the fields of mine production, assay detection and the like.

The invention belongs to the technical field of food or medicine, and particularly relates to a preparation method of nattokinase sustained-release microspheres, which comprises the following steps: mixing an emulsifier span-80 with liquid paraffin to obtain an oil phase; adding chitosan into an acetic acid solution to prepare a chitosan water solution as a water phase; dropwise adding the water phase into the oil phase to prepare W / O type emulsion, dropwise adding a cross-linking agent A into the emulsion to obtain chitosan microspheres, and taking a chitosan microsphere nattokinase solution and a cross-linking agent B to obtain nattokinase-chitosan core microspheres; mixing the nattokinase-chitosan core microsphere with a cortisol aptamer solution, and incubating to enable the aptamer to be combined on the surface of the nattokinase-chitosan core microsphere; and adding a casein-PEG copolymer solution and a cross-linking agent C into the microspheres to obtain the cortisol response type intelligent switch microspheres. The nattokinase release amount can be dynamically adjusted day and night, the circadian thrombus risk rhythm is matched, the anti-thrombus effect is remarkably improved, side effects are reduced, and the nattokinase can be widely applied to the fields of functional food and drugs.

The invention relates to a preparation method of a biomass-based degradable dust suppressant and a spraying device. The biomass-based degradable dust suppressant is prepared from the following components in percentage by weight: 0.78% of a biological matrix, 20.7% of a salting-out salt solution and the balance of an acetic acid solution diluted by deionized water, the method comprises the following specific steps: adding biological matrix powder into an acetic acid solution; the salting-out salt solution powder is poured into a biological matrix acetic acid solution, magnetic stirring is conducted for 30 min under the conditions that the rotating speed is 200 r / min and the temperature is 30 DEG C, and then ultrasonic treatment is conducted for 10 min for full reaction; a salting-out method and a dust suppression technology are combined, high-concentration salt solutions such as sodium citrate and sodium sulfate are selected, physical and chemical effects between salt ions and biomass material molecules are utilized, and the limitation of a traditional cross-linking mode is broken through the synergistic effect of salting-out auxiliary precipitation and weak ion cross-linking net forming; according to the present invention, the long-acting and safe dust suppression agent can be simply and conveniently prepared, the dust suppression efficiency can be effectively improved, and the dust suppression cost can be effectively reduced.

The invention discloses a three-dimensional bio-based hierarchical pore nanocarbon water photovoltaic power generation material as well as a preparation method and application of the three-dimensional bio-based hierarchical pore nanocarbon water photovoltaic power generation material. The specific technical scheme of the preparation method comprises the following steps: firstly, preparing an acetic acid solution containing chitosan, glucose and borax, and standing the solution at room temperature for 24 hours; then, freeze-drying the precursor solution, and pre-carbonizing xerogel in a drying oven for a certain time; and finally, adding a certain amount of water into the pre-carbonized dry gel, putting the pre-carbonized dry gel into a reaction kettle with a polytetrafluoroethylene lining, reacting for a certain time at a certain temperature, dialyzing the obtained wet gel, and drying at normal temperature and normal pressure to prepare the nano carbon aerogel with the hierarchical pore structure. The nano carbon aerogel has good hydrophilicity, abundant surface charges and a hierarchical pore structure, and is a low-cost and excellent water evaporation induced power generation material.

The invention provides a method for extracting and separating rare earth and aluminum from an acetic acid solution by using dynamic difference, which comprises the following steps: extracting the acetic acid solution containing rare earth and aluminum for 5-30 seconds by using an organic phase containing a phosphoric acid extracting agent to realize selective separation of rare earth and aluminum ions to obtain a rare earth-loaded organic phase and an aluminum-containing raffinate; the phosphoric acid-containing extraction agent comprises a P204 extraction agent and / or a P507 extraction agent; in the acetic acid solution containing rare earth and aluminum, the concentration sum of acetic acid and acetate is 0.3 mol / L-3. 5mol / L; the pH value of the acetic acid solution containing rare earth and aluminum is 4.0-5.0. As the coordination constant of aluminum ions and acetate is larger than that of rare earth ions and acetate, when the method is used for treating the acetic acid solution containing rare earth and aluminum, rare earth can be directly extracted and separated from the solution, and meanwhile, the method has the advantages that the operation is simple and convenient, and the method can be realized by using existing conventional equipment.

The invention is applicable to the technical field of biomedical materials, and provides an anti-inflammatory hemostatic composite gel microsphere and a preparation method and application thereof, and the preparation method comprises the following steps: mixing sodium alginate and baicalin, dissolving in deionized water to obtain a mixed solution, spraying the mixed solution into a calcium chloride solution by utilizing electrospinning and electrospraying, and carrying out electrostatic spinning and electrospraying to obtain the anti-inflammatory hemostatic composite gel microsphere. Gel microspheres are formed through ionic crosslinking; washing the gel microspheres with a calcium chloride solution, and soaking the gel microspheres in a chitosan acetic acid solution to obtain chitosan-encapsulated gel microspheres; placing the gel microspheres in a copper sulfate solution, and performing low-temperature calcium-copper ion exchange to obtain baicalin / copper alginate composite gel microspheres; and filtering, washing and freeze-drying the composite gel microspheres. The electrospray technology is combined with ionic crosslinking, the size and morphology of the microspheres are accurately controlled, the antibacterial effect on escherichia coli and staphylococcus aureus is remarkable, the in-vitro blood coagulation time is shortened by 30%, the cytotoxicity is low, and good biocompatibility is achieved.

The invention belongs to the technical field of biomass materials and environment-friendly adhesives, and relates to a biomass adhesive, in particular to a preparation method of a biomass environment-friendly adhesive based on longan shells, which comprises the following steps: firstly, cleaning, drying, crushing and screening the longan shells for pretreatment, and then carrying out alkalization and acetylation chemical modification to obtain the biomass environment-friendly adhesive based on the longan shells. And finally, compounding with gelatinized starch, a chitosan acetic acid solution and citric acid, and adjusting the viscosity to obtain the adhesive. The waste longan shells are used as raw materials, agricultural waste recycling is achieved, the product is free of formaldehyde release and biodegradable, and the viscosity of the prepared adhesive is 1000-2000 mPa.s at the temperature of 25 DEG C and is measured through a rotary viscometer; the wood-wood bonding strength is larger than or equal to 2.5 MPa, the 24-hour water absorption rate is smaller than or equal to 25%, the problems that a traditional biomass adhesive is short in performance and low in cost, special equipment is not needed for preparation are solved, the adhesive is suitable for the industrial fields of artificial board manufacturing, furniture manufacturing and the like, and environment-friendly transformation of the adhesive industry is promoted.

The invention relates to the technical field of electro-catalytic materials, in particular to a preparation method of a NiFe LDH / NiFeO / NF composite catalyst. The method comprises the following steps: carrying out acetic acid solution pretreatment on a foamed nickel substrate; growing a nickel-iron precursor on the pretreated foamed nickel through the first hydrothermal reaction, and treating to obtain NiFeO / NF; and growing a nickel-iron layered double hydroxide nanosheet on the surface of the NiFeO / NF through a second hydrothermal reaction to obtain the NiFe LDH / NiFeO / NF composite catalyst. According to the preparation method of the NiFe LDH / NiFeO / NF composite catalyst provided by the invention, a NiFeO / NF matrix is prepared by a hydrothermal synthesis method, after air heat treatment, a NiFe layered double hydroxide nanosheet with a smaller size is synthesized on the surface of NiFeO / NF by adopting a secondary hydrothermal process, and finally the NiFe LDH / NiFeO / NF composite catalyst is obtained.

The invention discloses a preparation method of a flexible electronic device with specific wet adhesion capability, which comprises the following steps: dissolving acrylamide Am, methacrylic acid esterified gelatin GelMA and chitosan powder in an acetic acid solution, uniformly stirring, adding carboxylated multi-walled carbon nanotubes (MWCNTs) into the mixed solution, stirring uniformly, and drying to obtain the flexible electronic device with specific wet adhesion capability. Performing ultrasonic treatment, water bath treatment and degassing treatment to obtain a precursor solution; the preparation method comprises the following steps: mixing sodium monohydrogen phosphate and sodium dihydrogen phosphate, adding sodium bicarbonate, adding ammonium persulfate as an initiator, fully stirring, and degassing to obtain a gelling solution for inducing physical crosslinking of chitosan; selecting a material with carboxyl, amino and hydroxyl groups to manufacture a mold for polymer cross-linking molding; and mixing and stirring the precursor solution and the gelling solution, injecting into a prepared mold, placing at room temperature, and integrally forming to manufacture the flexible electronic device. The invention further discloses application of the flexible electronic device in preparation of a bioelectric sensor sensitive element and tissue repair.

The invention belongs to the technical field of metal resource recovery and reutilization, and particularly relates to a selective recovery method for valuable metal in a retired crystalline silicon cell photovoltaic welding strip. The method comprises the following steps: disassembling a photovoltaic solder strip from a retired crystalline silicon cell, and removing impurities from the photovoltaic solder strip to obtain a clean solder strip; adding the clean welding strip into an acetic acid solution, heating and stirring to fully react, and filtering to respectively obtain filter residues, copper strips and lead-containing filtrate; adding a precipitant into the lead-containing filtrate to carry out precipitation reaction, and after the reaction is finished, carrying out solid-liquid separation, washing and drying to obtain a lead sulfate product; washing and drying filter residues to obtain a tin dioxide crude product; and washing the copper bar with absolute ethyl alcohol, and drying to obtain the metal copper bar with the purity not lower than 99.0%. The method has the advantages of high metal separation efficiency, high recovery rate, low energy consumption, low acid and alkali consumption, difficulty in causing secondary environmental pollution and the like, and provides a feasible solution for selective separation and recovery of valuable metals of retired photovoltaic modules.

The invention relates to a melamine sponge with a chitosan-wheat straw biochar coating as well as a preparation method and application of the melamine sponge. The preparation method comprises the following steps: crushing wheat straws, and pyrolyzing under an anaerobic condition to obtain biochar; the biochar is soaked in a Prussian blue dispersion liquid for modification, and Prussian blue modified biochar is obtained; dispersing the material in a chitosan acetic acid solution for reaction to form a chitosan-charcoal composite system; adding PDMS (Polydimethylsiloxane) to carry out siloxane reaction to form stable composite sol; and finally, spraying the composite sol on the surface of the pretreated melamine sponge to form the super-hydrophobic coating. Through the synergistic effect of Prussian blue, chitosan and PDMS, the hydrophobicity and oil adsorption capacity of the material are remarkably improved, the water contact angle of the obtained sponge material can reach 168 degrees, the adsorption capacities to normal hexane and chloroform respectively reach 34 g / g and 80 g / g, and the sponge material has good cycle stability and wide application prospects in the fields of oil-water separation and environmental pollution treatment.

The invention belongs to the technical field of dangerous solid waste treatment, and relates to a cascade deep detoxification method and system for waste incineration fly ash. Comprising the following steps: carrying out natural carbonation pretreatment on the fly ash to stabilize the pH value of the fly ash to be about neutral so as to obtain pretreated fly ash; carrying out primary washing on the pretreated fly ash by adopting an EDTA (Ethylene Diamine Tetraacetic Acid) solution, and carrying out solid-liquid separation to obtain primary washing slag; wherein the residual heavy metals in the first-stage washing slag obtained by the first-stage washing are mainly distributed in a weak acid extraction state; and carrying out second-stage washing on the first-stage washing slag by adopting an acetic acid solution. The method provided by the invention synergistically realizes deep and efficient removal of heavy metals in fly ash, and the final product meets safe disposal or resource utilization standards.

This invention discloses a flavoring microcapsule for heated tobacco products, its preparation method, and its application, belonging to the field of heated tobacco technology. The preparation method includes the following steps: dissolving zein in an aqueous ethanol solution to obtain a zein solution; dissolving chitosan in an aqueous acetic acid solution to obtain a chitosan solution; then adding heterocyclic flavorings, polyvinyl alcohol, and antioxidants to the chitosan solution and mixing to obtain a flavoring solution; mixing and stirring the zein solution and flavoring solution evenly; then emulsifying under cold conditions and freeze-drying to obtain the flavoring microcapsule for heated tobacco products. The preparation method of this invention can obtain heterocyclic flavoring microcapsules with good morphology, high heterocyclic flavoring encapsulation rate, and high flavor loading capacity. When used in heated tobacco products, these microcapsules exhibit a suitable sustained-release rate, long-lasting aroma, and good consistency in each puff; moreover, the preparation method is simple, safe, and environmentally friendly.

The invention belongs to the technical field of high polymer chemistry and composite materials, and particularly relates to a composite proton exchange membrane and a preparation method thereof. The method comprises the following steps: adding an original multi-walled carbon nanotube into a mixed acid solution, and carrying out oxidation treatment to obtain an acidified carbon nanotube; carrying out condensation reaction on the acidified carbon nanotube, a condensing agent and sulfanilic acid in a solvent system to obtain a sulfonated carbon nanotube; dispersing the sulfonated carbon nanotubes in an acetic acid solution to form a dispersion liquid, dissolving chitosan in the acetic acid solution to form a chitosan solution, and mixing the dispersion liquid with the chitosan solution to prepare a membrane casting solution; forming a membrane from the membrane casting solution to obtain an initial composite proton exchange membrane; and placing the initial composite proton exchange membrane in a sulfuric acid solution for crosslinking treatment, washing and drying to obtain the target composite proton exchange membrane. Based on the method, the technical effect of preparing the proton exchange membrane with excellent comprehensive performance is achieved.

The invention relates to the technical field of building lime materials, and particularly discloses a lime material doped with aerated concrete waste and a preparation method of the lime material. The invention relates to a lime material doped with aerated concrete waste. The lime material is prepared from the following raw materials: quick lime, composite regenerated powder, metakaolin, a lithium-based composite activator, modified nano-zinc oxide, semi-hydrated gypsum, hydroxypropyl methyl cellulose ether and sodium carboxymethyl starch, the composite regenerated powder is obtained by activating aerated concrete waste and waste clay brick powder through an acetic acid solution and composite alkali liquor; the modified nano-zinc oxide is obtained by modifying nano-zinc oxide with a silane coupling agent and trehalose. The lime material provided by the invention can effectively digest and utilize the aerated concrete waste and the waste clay brick powder; in addition, through collaborative innovation of a composite additive system, the coagulation strength and water resistance of the lime material are effectively improved.

The invention relates to the field of vegetable preservation, and discloses a preparation method of a volatile oil preservative and application of the volatile oil preservative in artemisia selengensis preservation, and the method comprises the following steps: step 1, weighing waste leaves and stems of artemisia selengensis, adding a sodium chloride solution, crushing with a juicer, then transferring into a round-bottom flask, enabling the round-bottom flask to be hermetically connected with a volatile oil steam distillation device to extract artemisia selengensis volatile oil, receiving volatile oil by using a centrifugal tube, and transferring the upper layer artemisia selengensis volatile oil by using a pipette; and step 2, weighing a hydrophilic emulsifier sucrose ester and chitosan powder, slowly adding the hydrophilic emulsifier sucrose ester and chitosan powder into the acetic acid solution, stirring while adding to avoid agglomeration, stirring at room temperature until the hydrophilic emulsifier sucrose ester and chitosan powder are completely dissolved to form a transparent or slightly milky white solution, adding the extracted artemisia selengensis volatile oil and glycerol, stirring in a sealed manner at room temperature, and degassing to obtain the artemisia selengensis volatile oil preservative. According to the method, a closed loop of waste recycling, preservative and homologous vegetable preservation can be realized, and the shelf life of artemisia selengensis is prolonged; meanwhile, the artemisia selengensis volatile oil has a certain compensation effect on the loss of the flavor of the clean artemisia selengensis.

The invention belongs to the technical field of oil-proof coatings, and discloses a starch-based oil-proof coating as well as a preparation method and application thereof. The method comprises the following steps: 1) reacting cassava starch with sodium periodate under the condition that the pH is 2-4, centrifugally washing to be neutral, and drying to obtain dialdehyde starch; 2) dispersing dialdehyde starch in water, and then performing gelatinization treatment to obtain a dialdehyde starch solution; dissolving chitosan in an acetic acid solution to obtain a chitosan solution; and 3) mixing the chitosan solution with the dialdehyde starch solution, adjusting the pH value to be acidic, and reacting to obtain the starch-based oil-proof coating. The method is simple, green and environment-friendly; the prepared coating is safe and biodegradable, has excellent oil-proof performance, and improves the tensile strength and tear strength of the paper.

The invention discloses a fat-soluble vitamin embedding material which comprises a medicine core and a zwitterionic membrane coating the medicine core, the medicine core is an oil-phase substance in which fat-soluble vitamins are dissolved; the zwitterionic membrane is obtained by crosslinking chitosan and sodium alginate. The invention also discloses a preparation method of the fat-soluble vitamin embedding material. The preparation method comprises the following steps: dissolving the fat-soluble vitamin in an oil phase substance to obtain an oil phase; and taking the oil phase, a sodium alginate aqueous solution and an acetic acid aqueous solution of chitosan to form W / O / W multiple emulsion, so that sodium alginate and chitosan are crosslinked, and then performing spray drying to obtain the fat-soluble vitamin embedding material. The invention also discloses an application of the fat-soluble vitamin embedding material in preparation of a calcium carbonate preparation. The invention also discloses a composite calcium carbonate / vitamin D3 preparation which comprises the following raw materials: calcium carbonate and the fat-soluble vitamin embedding material, and the fat-soluble vitamin is vitamin D3. The embedded substance is stable in quality and can be uniformly mixed with calcium carbonate.

The invention belongs to the technical field of fine chemical synthesis, belongs to a nonionic short fluorine chain surfactant, and relates to a preparation method of a fluorinated polyether surfactant. The preparation method comprises the following steps: reacting trimethylolethane with a hydrogen bromide acetic acid solution to prepare an intermediate 1; reacting the intermediate 1 in an alkaline environment without an organic solvent to prepare an intermediate 2; reacting the intermediate 2 with pentafluoropropanol under the action of potassium hydroxide and a catalyst 1 to prepare a fluorinated monomer; finally, the fluorinated monomer is subjected to ring opening polymerization under the action of an initiator and a catalyst 2, and the fluorinated polyether type surfactant is prepared. The method has the advantages of easily available raw materials, mild reaction conditions, simple synthesis, low cost, high yield and short fluorine chain of the product, can replace a long-chain fluorine-containing surfactant which is difficult to degrade, and can be used as an additive in the fields of photoresists, coatings, adhesives and the like. The surface tension can be obviously reduced, the surface defects of a coating can be reduced, and the appearance can be improved by adding a very small amount of the surface tension reducing agent.

The invention discloses instant powder based on a nano modification technology and a preparation method of the instant powder, and belongs to the technical field of modified nano materials. The method comprises the following steps: (1) extracting active ingredients from roots and stems of beautiful millettia roots, and carrying out ethanol ultrasonic extraction, concentration, resin purification and vacuum drying; (2) after radio frequency plasma nano activation treatment, centrifuging to obtain a precipitate; (3) dissolving chitosan, sodium alginate and beta-cyclodextrin in an acetic acid solution, adding the precipitate, and performing high-pressure homogenization to form 80-150nm core-shell nanoparticles; (4) adding a polyethylene glycol-polylactic acid copolymer and lecithin for ultrasonic functional modification; and (5) mixing with maltodextrin and the like, carrying out supercritical CO2 treatment, and then carrying out spray drying to obtain instant powder with D50 of 15-30 [mu] m. Compared with the prior art, through nano activation and surface modification, the defects that traditional powder is slow in dissolution, large in activity loss and poor in stability are overcome.

The invention relates to a P-N synergistic chitosan bio-based flame retardant and a preparation method thereof.The preparation method comprises the steps that chitosan is heated and dissolved in an acetic acid solution, nitrogen is introduced, an initiator is added, then a DOPO derivative with double bonds at the tail end, MDO and AA are added for a polymerization reaction, and the flame retardant is prepared. An environment-friendly biological material chitosan is used as a base material, a DOPO derivative with a P-N flame retardant property and a terminal double bond is firstly prepared, then the DOPO derivative, degradable MDO formed through ring opening polymerization and acrylic acid are jointly subjected to graft polymerization on the surface of the chitosan, and a formed macromolecular polymer chain has high flame retardance and can be degraded into a low-molecular structure; the chitosan-based macromolecule containing PCL and PAA chain segments has a biological environmental protection property, and when the chitosan-based macromolecule containing PCL and PAA chain segments is added into degradable plastics such as PLA, the chitosan-based macromolecule can also achieve good compatibility with plastic particles, so that the degradable plastics can be endowed with certain flame retardant property, and meanwhile, the chitosan-based macromolecule has good compatibility with the plastic particles, so that the degradation rate can be kept unaffected.