90 results about "Mixed solution" patented technology

The invention provides a method for preparing all-Inorganic perovskite films. The method include steps of 1) using temperature control technology and dissolving PbX<2> and CsX(X=Br, Cl, I) powder in an organic solvent under certain temperature to obtain a mixed solution; 2)spin coating the mixed solution on a substrate; and 3) standing the spin coated substrate for a while to obtain an all-Inorganic perovskite film, wherein the step 3) superfluous organic solvent on the surface of the film is removed through a vacuum-pumping method. The method is simpler and easier for operation than a conventional annealing film drying method, and the coverage rate of the obtained perovskite film is greater (approaching to 100%). The particles are smaller, and the performance of an electroluminescent device is better. The technical is simple, and the cost is low. Mass production of all-Inorganic perovskite electroluminescent device is facilitated.

The invention relates to a fluorosilicon waterproof oil repellent, and a synthesis method and application thereof. The synthesis method comprises the following steps: (1) mixing sodium borohydride, a simple substance iodine and 1/4 of perfluorinated polyether; slowly and dropwisely adding the rest 3/4 of perfluorinated polyether into the mixed solution, and reacting to obtain perfluorinated polyether methanol; (2) continuing adding bromopropylene and potassium carbonate, and reacting to obtain allyl perfluorinated polyether; and (3) mixing the allyl perfluorinated polyether, alkoxy silane and a platinum catalyst, and reacting to obtain the target product trialkoxysilylpropyl perfluorinated polyether. The fluorosilicon waterproof oil repellent is applicable to various glass panels, can easily form a film on the premise of ensuring the laminating effect, can obviously increase the scratch resistance of the protective film, and enables the protective film to have the waterproof, anti-fingerprint and oil-repellent functions. Besides, the film is very smooth, and thus, the fluorosilicon waterproof oil repellent has wide application prospects in high-end fields.

The invention relates to a preparation method of solid carbon dot fluorescent powder with high quantum yield. The preparation method comprises the following steps: weighing raw materials according tothe following constituents in parts by weight: 0.25 to 1 part of potassium hydrogen phthalate, 0.5 part of sodium azide and 0.25 to 1 part of boric acid; mixing the raw materials, then dissolving themixture in a formaldehyde solution ultrasonically, putting the mixed solution in a microwave oven for heating at the power of 225 to 750 W for 4 to 10 min, and completely evaporating the liquid at theend of reaction to obtain white powder which is nitrogen and boron-doped carbon dots (NBCDs). The preparation method is low in cost, high in preparation speed and easy to operate; the quantum yield (QY) of the prepared solid luminous NBCSs is extremely high, and the absolute solid luminous QY of the NBCSs is 67.7 percent.

The invention discloses a modified lithium-rich manganese-based cathode material for a lithium ion battery. The structural general formula of the material is (La<1-x>Sr<x>)MnO<3-delta>, wherein x is equal to or greater than 0 and less than or equal to 0.3, a is equal to or greater than 0.8 and less than or equal to 1, and delta is equal to or greater than 0 and less than or equal to 0.75; the modified lithium-rich manganese-based cathode material is prepared through the method 1 or method 2 as follows: method 1: lanthanum salt, strontium salt and manganese salt are mixed according to the stoichiometric proportion to prepare a (La<1-x>Sr<x>)MnO<3-delta> precursor solution, then a complexing agent is added into the solution and stirred uniformly, the lithium-rich manganese-based cathode material is added into the solution, heating is performed to evaporate the solution to form gel, and finally the dried gel is calcined, so that the modified cathode material is obtained; method 2: a precursor solution is prepared according to the method 1, a complexing agent is added into the solution and stirred uniformly, then the mixed solution is heated until the solution is burnt into powder, the powder is pre-burnt and is mechanically mixed with the lithium-rich manganese-based cathode material, and the mixture is calcined, so that the modified cathode material is obtained.

The invention discloses a trivalent copper catalyst and a preparation method thereof and application to hydrochlorination of acetylene. The preparation method of the trivalent copper catalyst comprises the steps that a nitrogen-containing heterocyclic compound and copper salt are added into a trichloromethane solution to mix to obtain a mixed solution A containing a bivalent copper compound; ionicliquid is added into the obtained mixed solution A, and under the action of an oxidant, a mixed solution B containing a trivalent copper compound is obtained; and a porous solid carrier is immersed in the obtained mixed solution B containing the trivalent copper compound for 0.5-5 h, then the treated solid is taken out, and heated and dried under the condition of blue light irradiation, and the trivalent copper catalyst is obtained. The trivalent copper catalyst is used for the reaction of acetylene hydrochlorination to prepare vinyl chloride. The trivalent copper catalyst is prepared by simple operation steps, the stability and activity of the catalyst are improved, the production cost is lowered, and good application prospect is achieved.

The invention relates to a method for preparing a test solution for quality detection of a safe stagnation removing preparation. The method comprises the following steps of: (1), extracting solution preparation: weighting 0.5-10.0g of solid safe stagnation removing preparation or contents thereof, adding a universal solvent for extracting alkaloid, carrying out ultrasonic treatment or heating backflow, cooling down, and filtering to obtain a filter liquid as an extract liquid for later use; or weighting 4-80ml of liquid safe stagnation removing preparation, and filtering to obtain the filter liquid as the extract liquid for later use; and (2) extract liquid purification: taking out the extract liquid, drying through steaming, dissolving residues by adding 1-10ml of hydrochloric acid solution (1-5,000) to the residues, centrifuging a mixed solution, taking out supernatant to slowly pass through an octadecylsilane bonded silica gel column (50-500mg), eluting by water of 2-30ml, collecting an effluent liquid and an eluting liquid, drying by steaming, dissolving the residues by adding 1-10ml of methanol with the volume percent of 30-100% or alcohol with the volume percent of 50-95%, standing, and taking out supernatant which is the test solution for a leonurus indexity element stachydrine hydrochloride thin layer discriminating and/or content determining method in the safe stagnation removing preparation.

The invention discloses a polymethyl methacrylate-zinc hydroxide nanocomposite and a preparation method thereof. The nanocomposite is powder of which the grain size is 5-40mum. The nanocomposite is formed by connecting zinc hydroxide nanosheets and polymethyl methacrylate in mass percent of (1-40):(60-99) by Zn-O chemical bonds. The zinc hydroxide nanosheets are 5-50mum long, 5-50mum wide and 50-500nm thick, and the polymethyl methacrylate is 50-500nm in grain size. The preparation method comprises the following steps of mixing soluble ammonium salt, soluble zinc salt and water firstly and evenly stirring to obtain mixed solution, adding the polymethyl methacrylate to the mixed solution and stirring to obtain complex solution, subsequently, adding an emulsifying agent to the complex solution and severely stirring to obtain emulsion, then, adding an initiating agent to the emulsion to obtain composite emulsion, and then, putting the composite emulsion in vacuum for drying to obtain a target product. The polymethyl methacrylate-zinc hydroxide nanocomposite is excellent in heat stability, and can be widely used in the field of aviation, automobiles, electronic instruments, consumer goods and the like.

The invention discloses a preparation method for vacuum drying of transglutaminase. The preparation method comprises the following steps of: adding a heat protectant in fermentation broth of the transglutaminase; standing the mixed solution at room temperature; carrying out high-speed freezing and centrifuging on the mixed solution to obtain supernate; precipitating the fermentation broth with 95 percent ethanol; carrying out high-speed freezing and centrifuging on the precipitated solution to obtain a precipitate; adding an antioxidant protectant; and carrying out uniform mixing and vacuum drying to obtain an transglutaminase preparation. The transglutaminase obtained by using the preparation method disclosed by the invention has greatly-improved stability.

The invention discloses a method for separating and extracting all metal components from waste printed circuit boards through wet metallurgy. The method specifically includes the following steps that (1) powder of the printed circuit boards containing electronic elements is obtained; (2) active metal in metal concentrate is separated through a mixed solution containing dilute sulphuric acid and copper sulfate, and after solid-liquid separation, the liquid phase is used for recovering the active metal, and precious metal is further extracted from a solid part; (3) the solid part obtained in the step (2) is added into a cultivation system for inoculating strains, and leaching of copper through microorganisms is carried out; (4) after solid-liquid separation, Cu in the liquid phase is recovered, and precious metal such as Au and Ag is further extracted from solid residues. By means of the method, heavy metal ions are prevented from restraining strain activity and bio-leaching efficiency, a microorganism reaction can be carried out continuously and efficiently, and therefore the whole technological process is shortened, cost is reduced, and the microorganism leaching efficiency is improved.

The invention provides a preparation method of ZnCdSe/ZnS quantum dots. The method comprises the following steps that 1, a zinc source, a cadmium source, organic acid and/or organic amine and an organic solvent are stirred and heated to be dissolved after shielding gas is introduced to obtain a zinc and cadmium mixed pro-solution; 2, the solution is heated to 200-350 DEG C, and then a selenium source is injected into the solution within 30 s; 3, a sulfur source or sulfur and zinc source mixed solution is added drop by drop; 4, the temperature of 200-350 DEG C is kept constant, then cooling is performed to reach the room temperature, and separation and purification are performed to obtain ZnCdSe/ZnS quantum dots. The preparation method of the ZnCdSe/ZnS quantum dots is safety to implement, simple, controllable, low in cost, and capable of achieving repetition and amplification; the obtained quantum dots are uniform and controllable in size and appearance, the monodipserity is good, the fluorescence quantum yield is high, and the good stability on the high-temperature, washing and water dissolution modification and other conditions is good.

The invention discloses a preparation method of (2S,3S)-2,3-butanediol, and belongs to the technical field of biochemistry. The preparation method comprises the following steps of: stirring and mixingsolution containing ketoreductase with buffer solution to obtain mixed solution; in the stirring process, adding nicotinamide adenine dinucleotide, isopropanol and 2,3-butanedione into the mixed solution to perform closed reaction, so that reaction solution is obtained; carrying out reduced pressure suction filtration and rotary evaporation treatment on the reaction solution to obtain extractingsolution; and carrying out rectification separation on the extracting solution to obtain the (2S,3S)-2,3-butanediol. Meanwhile, the invention provides an amino acid sequence of the ketoreductase for catalyzing 2,3-butanedione to generate the (2S,3S)-2,3-butanediol. The invention further provides a nucleotide sequence for coding the ketoreductase. The preparation method is simple in synthetic routeand high in efficiency; 2,3-butanedione is reduced into (2S,3S)-2,3-butanediol by selecting the ketoreductase in an isopropanol system; the conversion rate of 2,3-butanedione can reach up to 95%; andin addition, the chiral purity of the prepared (2S,3S)-2,3-butanediol product can also reach 98%.

The invention relates to a method for preparing composite yeast nutritious drinks, and belongs to the technical field of nutritious drinks. According to the technical scheme, the method includes the steps that lyceum barbarum extract is prepared; a yeast extract solution is prepared; syrup feed liquid is prepared; the obtained lyceum barbarum extract and the yeast extract solution are added to the syrup feed liquid, the lyceum barbarum extract, the yeast extract solution and the liquid are evenly mixed, sodium erythorbate is added to the mixed solution, and high pressure homogenization is conducted on the mixed solution; the solution after high pressure homogenization processing is sterilized, filtered and clarified through a ceramic membrane, and filled into vessels, and then the composite yeast nutritious drinks are prepared. The prepared lyceum barbarum and yeast nutritious drinks have quite rich nutrient substances, lyceum barbarum contains a lot of nutrients such as amino acids, lyceum barbarum polysaccharides, inorganic salt, glucose, taurine and betaine, and the nutrients are essential to human body; yeast extract contains 18 kinds of amino acids and polypeptides, multiple B vitamins, nucleic acids and multiple mineral elements. The prepared drinks have the functions of nourishing the kidney and tonifying the liver, benefiting qi and promoting the production of body fluid, improving eyesight and soothing nerves, resisting fatigue and improving human body immunity.

The invention relates to an ice temperature gas conditioning and coupling compound antioxidant multiple-factor fence preservation technology of cooked beef, belonging to the technical field of meat preservation. The method comprises the steps of soaking the beef into a mixed solution containing 0.25-0.75% of tert-butyl hydroquinone (TBHQ), 10.75-20.75mg/ L of tea polyphenol and a flavoring agent, cooking thoroughly, cooling and then putting the cooked beef into a food preservation box; vacuumizing, and charging 60-80% of oxygen, 10-30% of nitrogen and 10% of CO2; sealing the box by using a high-barrier compound packaging film which is made of polyethylene terephthalate (PET)/ chlorinated polypropylene (CPP) material and has the thickness of 0.062mm, and preserving at the temperature of 0-1 DEG C. Therefore, the aims of good preservation effect, low cost, good flavor and long preservation time are achieved.

A method for producing a slurry for a heat-resistant layer for a lithium ion secondary battery, including: a step of producing a polymer aqueous dispersion by polymerizing a monomer in an aqueous medium to give a polymer aqueous dispersion containing a polymer with a polymerization conversion rate of 90 to 100%, a step of obtaining a mixed solution by mixing N-methylpyrrolidone and the polymer aqueous dispersion, a step of obtaining a binder composition by removing an unreacted monomer and the aqueous medium from the mixed solution, and a step of obtaining a slurry by dispersing non-conductive microparticles in the binder composition, wherein the step of obtaining the binder composition includes removing the aqueous medium and the unreacted monomer by using a distillation column under a reduced pressure so that the binder composition contains the unreacted monomer and a water content in predetermined amounts.

The invention provides a perovskite solar cell and a preparation method thereof. The perovskite solar cell comprises the steps of spin coating a ZnO precursor on the surface of a transparent conductive electrode to form an electron transport layer; Forming an absorbing layer on the electron transport layer, forming the absorbent layer comprises: PbI2 is dissolved in a mixed solution of dimethylformamide (DMF) and dimethyl sulfoxide (DMSO), then adding guanidine isothiocyanate, stirring and dissolving, then spin coating the mixed solution of PbI2 and guanidine isothiocyanate onto the electrontransport layer for first baking, then immersing in isopropyl alcohol (IPA) solution of CH3NH3I for second baking; forming a hole transport layer on the absorbing layer; A metal electrode is for on that hole transport layer. The perovskite solar cell provided by the invention optimizes the stability of the solar cell and improves the hysteresis effect of the solar cell.

The invention provides a preparation method for MnO2@SiO2 nano composite particles with core-shell structures. The method comprises the steps of A) mixing potassium permanganate and a silica precursorto obtain a mixed solution; B) irradiating the mixed solution with a cobalt 60 source under a stirring condition to initiate reactions to obtain a mixed solution after irradiation; C) centrifuging the irradiated mixed solution, and separating to obtain the MnO2@SiO2 nano composite particles with the core-shell structures. The method directly irradiates the potassium permanganate solution containing the silica precursor by 60Co gamma-ray, and obtains the MnO2@SiO2 composite nano particles with particle diameters of 100 nanometre or less which take MnO2 as cores and SiO2 as shells by a one-stepmethod. The method has the advantages of simple formula, convenient operation, economic performance, energy saving, green and environmental protection.

The invention discloses epoxy emulsion cured at room temperature with high aquosity and weather resistance as well as a preparation method of the epoxy emulsion. The epoxy emulsion comprises the following components in percentage by weight: 15-20 percent of E-20 epoxy resin, 5-10 percent of E-12 epoxy resin, 1.0-1.5 percent of benzoyl peroxide, 4.0-6.0 percent of methacrylic acid, 3.0-8.0 percent of hexafluorobutyl acrylate, 0.5-2.5 percent of diacetone acrylamide, 0.5-2.5 percent of adipic acid dihydrazide, 10-20 percent of ethylene glycol monobutyl ether, 5-10 percent of n-butyl alcohol, 3.5-5.5 percent of N,N-dimethylethanolamine and 22-40 percent of water. The preparation method comprises the following steps: firstly, adding E-20 epoxy resin, E-12 epoxy resin, n-butyl alcohol and ethylene glycol monobutyl ether to be evenly dissolved; then, dipping mixed solution of benzoyl peroxide, methacrylic acid, hexafluorobutyl acrylate, diacetone acrylamide and adipic acid dihydrazide to be reacted; and adding N,N-dimethylethanolamine and water to prepare the epoxy emulsion. The epoxy emulsion and the preparation method of the epoxy emulsion have the characteristics of weather resistance, abrasive resistance, water resisting property, alkali resistance, corrosion resistance, flexibility, washable resistance, environment protection and simple preparation process.

The invention discloses a method of synthesizing a nano zinc silicate light emitting material by using waste silicon powder by a hydrothermal method. The method comprises the following steps: (1) dissolving Zn(CH3COO)2.2H2O, Mn(NO3)2.4H2O and hexadecyl trimethyl ammonium bromide in deionized water, adding the waste silicon powder, stirring for 15 minutes, adding sodium hydroxide or ammonium water with concentration being 25%, and stirring for 10 minutes to obtain a mixed solution; (2) putting the mixed solution prepared in the step (1) in a reaction kettle with the liner being polytetrafluoroethylene, sealing the reaction kettle, putting the kettle in an oven at 130-200 DEG C to react for 12-48 hours, taking, naturally cooling to room temperature, washing the product by distilled water. carrying out centrifugal separation, and naturally drying to obtain the zinc silicate light emitting material. By using waste silicon powder as a raw material, the method disclosed by the invention expands the range of reactants and can fully utilize industrial leftovers and achieve the purpose of recycling resources. Furthermore, the method disclosed by the invention which is a hydrothermal one-step reaction is simple and feasible and low in energy consumption.

The invention relates to a zinc oxide-based nano-drug composition, and a preparation method and an application thereof. The preparation method of the composition comprises the following steps: 1, mixing a sodium hydroxide and/or potassium hydroxide-alcohol solution and a zinc acetate-alcohol solution to obtain a zinc oxide colloid reaction solution; 2, taking the zinc acetate-alcohol solution, simultaneously or successively adding the zinc acetate-alcohol solution and the drug molecule-containing sodium hydroxide and/or potassium hydroxide-alcohol solution to the zinc oxide colloid reaction solution obtained in step 1; and 3, centrifuging a mixed solution obtained in step 2, removing the obtained supernatant, washing the obtained material, purifying the washed material, and drying the purified material to prepare the composition. Zinc oxide is compounded with the drug through directly using the self properties of zinc oxide and the drug, and no polymer is introduced, so the synthesis method is simple and effective. The prepared composition has good dispersibility, the hydrodynamic size is 40-90nm, and the composition has the characteristics of high bioavailability, low toxicity and degradability.

The invention relates to a preparation method of an adsorption material for selectively adsorbing silver ions. The preparation method comprises the following steps: uniformly dispersing a chitosan-graphene oxide composite material in an acetic acid solution, adding 3-mercaptopropyltrimethoxysilane, uniformly stirring the obtained solution, adding a sodium hydroxide solution to adjust the pH value of the obtained system, adding a glutaraldehyde solution, stirring the solutions to obtain a uniformly mixed solution, standing the uniformly mixed solution at 3-4 DEG C for 20 h or more, and carrying out post-treatment to obtain the mercapto modified chitosan-graphene oxide composite material. The preparation method overcomes the shortcoming of difficulty selective adsorption of the silver ions from a complex environment of adsorption materials in the prior art. The adsorption material prepared in the invention has large adsorption capacity, can quickly selectively adsorb silver ions, and makes the silver ion adsorption balance time much shorter than the adsorption balance time in the prior art.

The invention belongs to the technical field of printing ink manufacturing and discloses waterborne printing ink for food package printing and a preparation method of the printing ink. The printing ink is prepared from, by weight, 20-40% of pigment, 13-30% of acrylic acid resin, 12-30% of acrylic acid emulsion, 0.5-1.5% of flatting agent, 0.1-0.2% of defoaming agent, 3-10% of ethyl alcohol and 15-50% of water. The preparation method includes the steps that water, acrylic acid resin, acrylic acid emulsion, pigment and ethyl alcohol are added into a dispersion machine to be pre-dispersed, then the mixture is heated to 25-60% to be evenly stirred and dispersed, and a mixed solution is obtained; the mixed solution is added into a ball mill to be ball-milled till the fineness reaches 10-25 micrometer, then the flatting agent and the defoaming agent are added, and the waterborne printing ink for food package printing is obtained. The waterborne printing ink is safe, environmentally friendly, simple in preparation method, controllable in printing ink printing parameter and wide in application prospect.

The invention discloses a wound protecting composition with bleeding-stopping and anti-bacterial functions and a preparation method of the wound protecting composition. The wound protecting composition comprises the following steps: (1) preparing an organic high molecular mixed solution; (2) adding one or two of chitosan and chitin into acetic acid, ethanol and water so as to prepare a bleeding-stopping and anti-bacterial material solution; (3) carrying out multi-spray-head electrostatic spinning so as to prepare a composite fiber material; and (4) drying the composite fiber material, removing residual solvents, and carrying out hot-press shaping, so as to prepare the wound protecting composition with the bleeding-stopping and anti-bacterial functions. The wound protecting composition disclosed by the invention has good bleeding-stopping and anti-bacterial effects, can be used for cleaning wounds and is good in biocompatibility; the water absorption rate is obviously increased, the bleeding-stopping time is greatly shortened, and the wounds are further protected.

The invention relates to a polyamic acid solution, a preparation method and applications thereof. In the prior art, the polyamic acid raw solution is non-uniform, and has more gel particles, such thatthe process is not easily controlled, and the quality of the product is reduced. A purpose of the present invention is mainly to solve the problems in the prior art. According to the technical scheme, a polyamic acid solution is provided, and comprises a mixed solution of a prepolymer solution 1 and a prepolymer solution 2, wherein the prepolymer solution 1 is obtained by carrying out a reactionon X moles of diamine and Y moles of dianhydride, the prepolymer solution 2 is obtained by carrying out a reaction on Z moles of diamine and K moles of dianhydride, Y/X is more than or equal to 0.5 and is less than or equal to 0.98, and K/Z is more than or equal to 1.02 and is less than or equal to 2.0. With the technical scheme, the problem in the prior art is well solved. The product of the present invention can be used in the industrial production of polyimide materials.