38results about How to "The preparation method is simple and easy to control" patented technology

The invention discloses a synthesis method of functional feed additive butyric acid mono-and di-glyceride, comprising the following steps: heating and reflowing glycerol and n-butyric acid in the presence of phosphoric acid serving as a catalyst and carbon tetrachloride serving as a water-carrying agent; stopping reacting until the amount of the water in a water knockout drum is almost constant; distilling out the carbon tetrachloride to prepare a crude product; rinsing the obtained crude product by utilizing a saturated salt solution with the pH of 10 for many times so as to remove the reactant and catalyst which do no react; and separating and purifying until the low-layer aqueous phase is alkaline, thus obtaining the butyric acid mono-and di-glyceride. The method is simple and easy to control, and has the advantages that the reaction condition is safe and moderate, separation and purification can be carried out easily, and the steps are less.

The invention discloses a sliver-carried antibacterial material which takes pure cotton cloth and cotton blended cloth such as brocade cotton, polyester cotton and cotton polyester in cotton fabrics as a basal body and a preparation method thereof, and belongs to the technical field of functional high polymer materials. Silver is uniformly distributed in fiber skeletons of the antibacterial cotton fabrics. The preparation method of the sliver-carried cotton fabric comprises the following steps: applying a nonionic surfactant to treat pure cotton cloth, the brocade cotton, the polyester cotton and the cotton polyester in the cotton fabrics, soaking in silver ammonia liquor, and applying a reducing agent to reduce after heating reaction is ended, so that the sliver is uniformly distributed in the fiber skeletons of the antibacterial cotton fabrics. The preparation method is simple and easy to control, gentle in reaction condition, short in time consumption, low in energy consumption, low-carbon and environment-friendly, and the applied reaction agent is low in toxicity and environment-friendly. After being carried with sliver, the silver-carried cotton fabrics can well resist escherichia coli and staphylococcus aureus.

The invention discloses a Tibetan medicine composition with whitening and freckle removing functions and application and a preparation method of the Tibetan medicine composition. Aiming at the defects that in the prior art a whitening and freckle removing product which takes Tibetan medicine materials as raw materials is high in price, the invention provides the Tibetan medicine composition with the whitening and freckle removing functions. The Tibetan medicine composition comprises the following raw material components: 2-4 parts of chishuluodi, 1-3 parts of iris ensata thumb, 1-3 parts of western Sichuan synotis wallichii, 1-3 parts of Chinese parsley fruit and 1-3 parts of swertia multicaulis. The composition is a Tibetan medicine composition which is prepared from components in appreciate ratio. The chemical analysis experiment and the human body testing show that the Tibetan medicine composition has the whitening and freckle removing functions. The Tibetan medicine composition can be used for preparing whitening and freckle removing products, and can be used for preparing whitening and freckle removing medicines and/or healthcare products. The invention further provides a preparation method of the Tibetan medicine composition.

The invention belongs to the photoelectron component technology field, it relates to the preparation method of the tuning grating in liquid crystal refractive index electric fields. First, mixing the photochromic high molecular material with azo base group and liquid crystal, and then pouring it into liquid crystal box; the liquid crystal box is composed of two pieces of glass base board whose inner surface is with transparency conductive film (ITO) , using isolation material to control the gap between two base board, and fixing with AB glue; using grating cover film board, irradiating with ultraviolet polarized light; the photochromic high molecular material doing isomerization reaction in bright streak area, inducing the fetch direction of the liquid crystal to be different in the bright ,dark streak area , forming the liquid crystal refractive index grating. The invention not only makes the preparation process of grating facilitated, it uses the photochromic high molecular material with high molecular weight to improve the long range stability of component while reduce the drive voltage of grating component, it can be preserved for eight months under the room temperature, the demands of external environment is not high. It has the advantages that the electric field is adjustable; driving voltage can match the integrated circuit.

The invention provides a cobalt-based molecular sieve catalyst and a preparation method thereof. The preparation method includes: mixing cobalt with one or multiple of soluble metal salts of Cr, Bi, Ce, Sn and Cd to prepare a mixed solution of 10%+/-5% in mass percentage; soaking a molecular sieve carrier in an alkaline solution, performing airtight hydrothermal reaction treatment, washing, and drying; mixing the mixed solution obtained in the above steps with the molecular sieve carrier, drying, and then roasting at 300-800 DEG C. By using the cobalt-based molecular sieve catalyst, complete decomposition temperature of N2O can be substantially lowered to below 400 DEG C.

The invention relates to an S-(carboxymethyl)-L-cysteine ammonium salt water crystalline pharmaceutical compound (having the following structural formula) and a preparation method and the application of the compound in the preparation of medicines for eliminating phlegm as well as medicines for preventing and treating respiratory system diseases such as chronic obstructive pulmonary diseases (COPD) and the like. After the compound is adopted, the COPD model rat airway resistance is remarkably reduced, the generation of oxide is reduced, the antioxidant level is increased, and the damage of oxide, inflammatory mediator and the like to the lung can be relieved.

The invention discloses a hydrothermal synthesis method for a nitrogen-doping graphene-loaded cobalt oxygen reduction reaction electrocatalyst. The hydrothermal synthesis method comprises the steps of fully mixing and placing GO (graphene oxide) and urea in a baking oven for nitrogen-doping thermal treatment; smashing and adding the nitrogen-doping GO into deionized water for ultrasound dispersion for 0.5 hour, transferring the obtained product to a hydrothermal reaction kettle, performing magnetic stirring for 20 minutes, adding a cobalt salt, continuing to stir for 10 minutes, and sealing the reaction kettle for hydrothermal reaction; and adding hydrazine hydrate after the hydrothermal reaction is completed, adjusting pH of a solution to be 10 with concentrated ammonia water, sealing the reaction kettle, and continuing hydrothermal reduction reaction to obtain a nitrogen-doping graphene-loaded cobalt composite material. The nitrogen-doping graphene-loaded cobalt composite material prepared according to the method is used as the oxygen reduction reaction electrocatalyst, a cyclic voltammetry reduction peak potential in 0.1M of KOH solution is -0.18V (vs.Ag/AgCl), and an initial potential is -0.1V (vs.Ag/AgCl).

The invention discloses a preparation method for flowery health vinegar. The method comprises the following steps of 1) pretreatment of raw materials, namely crushing jasmine flowers, chrysanthemum flowers, honeysuckle flowers and sweet osmanthus flowers into powder with granularity of 60 to 100 meshes respectively, and mixing the jasmine flower powder, the chrysanthemum flower powder, the honeysuckle flower powder and the sweet osmanthus flower powder at the weight ratio of (1-2):(1-2):(1-2):(1-2) to obtain raw material powder; 2) digestion, namely charging the raw material powder in an extraction tank, adding water in an amount which is 10 to 15 times the weight of the raw material powder, soaking the raw material powder for 1 to 3 hours, performing reflux extraction for once to three times for 0.5 to 1 hour every time, performing filtration, and concentrating filtrate under reduced pressure at 50 to 55 DEG C to obtain a concentrated solution of which the concentration is 0.2 to 0.5g/mL based on the weight of the raw materials; 3) blending, namely uniformly blending the concentrated solution and vinegar at the volume ratio of 1:(10-20) to obtain a mixed solution; 4) filling and sealing and sterilization, namely filling and sealing the mixed solution by using a low-vacuum filling and sealing machine, and performing sterilization to obtain the flowery health vinegar by using a low-temperature pasteurization method. The flowery health vinegar is fragrant and free of strong traditional Chinese medicine smell and vinegar smell, and has the effects of removing blood poison and nourishing the liver to improve visual acuity.

The invention relates to an S-(carboxymethyl)-cysteine pharmaceutical compound and a preparation method and the usage of the compound; the structural formula of the compound is shown by (I); and the compound is especially applied to the preparation of medicines for eliminating phlegm as well as medicines for preventing and treating respiratory system diseases such as chronic obstructive pulmonary diseases (COPD) and the like. After the compound is adopted, the COPD model rat airway resistance is remarkably reduced, the generation of oxide is reduced, the antioxidant level is increased, and the damage of oxide, inflammatory mediator and the like to the lung can be relieved.

The invention discloses a preparation method of a grid-structure TiB2-Ti composite metal-ceramic material. The preparation method comprises the steps of 1, weighing Ti powder and TiB2 powder, carrying out ball-milling after the Ti powder and the TiB2 powder are mixed through volatile organic solvents and then drying the Ti powder and the TiB2 powder for obtaining pre-alloy powder, wherein the granularity of the TiB2 powder is smaller than that of the Ti powder, and the ratio of the Ti powder to the TiB2 powder to the volatile organic solvents is 20-50% to 20-50% to 15-30% by weight; 2, filling a die with the pre-alloy powder and then placing the die inside a vacuum furnace for sintering; and 3, taking out the sintered pre-alloy powder and the die together, placing the sintered pre-alloy powder and the die inside another die for high-temperature and high-pressure synthesis and finally obtaining the grid-structure TiB2-Ti composite metal-ceramic material, wherein the pressure is 3-5 GPa, the heating power is 2000-3800 W and the time is 1-5 min according to the technological conditions of high-temperature and high-pressure synthesis. The grid-structure TiB2-Ti composite metal-ceramic material is excellent in corrosion resistance, thermal shock resistance and disintegration resistance.

The invention belongs to the technical field of alloy and particularly relates to a copper alloy wire and a preparation method thereof. The copper alloy wire takes copper as a matrix, and the added elements are tin or tin and at least one of titanium, magnesium, silicon or boron. The preparation method comprises the following steps: preparing a copper alloy rod from copper alloy liquid through a leading rod, performing necking processing, performing recrystallization and heat treatment, sequentially performing big pull, medium pull and small pull and preparing the copper alloy wire. The copperalloy wire is easy to thin, high in tensile strength and high in electrical conductivity, and can meet demanding application in the fields of a coaxial wire, a wire for automobile lightweight and a wire for a minitype loudspeaker coil; and the application prospect has high expectability and the cost is low.

The invention discloses a preparation method of a Cs<n>FA<1-n>PbX<3> perovskite thin film, and particularly relates to a preparation method of a high-quality Cs<n>FA<1-n>PbX<3> (0<n<=1) perovskite thin film with phase separation inhibition. The method comprises the following steps: S1, mixing CsX, FAX, PbX<2> and DMAX, and dissolving in a solvent to obtain a precursor solution A; and S2, coating asubstrate with the precursor solution A, and annealing the coated substrate to remove the solvent and DMAX, thereby obtaining the stable Cs<n>FA<1-n>PbX<3> perovskite thin film, wherein X is halogen,and 0<n<=1. The Cs<n>FA<1-n>PbX<3> perovskite thin film prepared by the method has the characteristics of no phase separation, high crystallinity, compact and flat surface, high phase stability, convenience in operation, lower cost and the like, and is convenient for large-scale production in factories.

The invention belongs to the technical field of maltodextrin, and particularly relates to a preparation method of esterified maltodextrin. The preparation method comprises the following steps: dispersing and dissolving maltodextrin in an aqueous solution of ethanol, and then adding an acidifier for ultrasonic dispersion reaction to obtain acidified maltodextrin; afterwards, adding a pH regulator and a modifier to the acidified maltodextrin, carrying out ultrasonic reaction for esterification, and after adding an inorganic initiator, sealing, heating, pressurizing and internally circulating for secondary esterification reaction, and filtering to obtain an esterified maltodextrin refined product; and finally putting the esterified maltodextrin refined product into a glycerol-ethanol solvent, micro-boiling in a water bath for reflux reaction, and washing with ethanol after filtration to obtain high-quality esterified maltodextrin. The preparation method provided by the invention is easy to control, high in esterification efficiency and high in yield, and solves the problems of low yield and complicated refining process in the prior art.

The present invention relates to a 7-amino-3-hydroxymethyl-3-cephalosporin-4-carboxylate crystal and a production method thereof and discloses the diffraction pattern of the crystal copper target X ray powder of the compound and represents each datum with a 2 Theta angle, an interplanar distance d and relative strength I/I0, and the production method includes the following steps: (1) the compound is alkalified for dissolution, pH is kept to be less than or equal to 9, and reaction temperature is between negative 10 DEG C to 35 DEG C; (2) the reaction solution is acidified, pH is kept to be larger than or equal to 3, the reaction temperature is between negative 0 DEG C to 50 DEG C, and therefore the product is crystallized in aqueous solution or the mixture system of water and organic solvent mixed with water. The purity of the crystal produced by the present invention reaches 98.5 percent or higher, the stability of the crystal is good, the crystal is not easily isomerizated or dehydrated to form a ring-closing compound, and can be stored for a long time, conveniently transported and sold, etc. under an economic condition, moreover, the method for producing the crystal is safe, the cost is low, the reaction process is simple and can be easily controlled, subsidiary products, such as ring-opening products, ring-closing products, dehydroxylated products, etc., cannot be easily formed, and meanwhile, the amount of substances related to optical isomers, double-bond migration structures, etc. is tiny or is not produced.

The invention belongs to the technical field of preparation of one-dimensional hollow tubes, and particularly relates to a Ti3C2Tx MXene one-dimensional hollow nanotube as well as a preparation method and application thereof. The diameter of the Ti3C2Tx MXene one-dimensional hollow tube disclosed by the invention is about 300 to 800 nm; The synthesis method comprises the following steps: adding polyvinylpyrrolidone and polymethyl methacrylate into N,N-dimethylformamide, dissolving to obtain a spinning solution, carrying out electrostatic spinning, carrying out water bath collection by using a Ti3C2Tx MXene suspension to obtain a fiber precursor, and carrying out heat treatment to obtain the Ti3C2Tx MXene one-dimensional hollow tube structure. The one-dimensional hollow tube structure synthesized by the method is uniform in morphology, can effectively inhibit material aggregation and stacking and shorten a lithium ion transmission path as a negative electrode material, and shows high lithium storage capacity and excellent rate capability.

The invention belongs to the technical field of preparation of self-supporting flexible films, and particularly relates to a method for synthesizing a MoO2@C nanofiber flexible film material through an electrostatic spinning technology. The method comprises the following steps: dissolving a molybdenum source in a mixed solution of deionized water and ethylene glycol to obtain a solution A; addingpolyvinylpyrrolidone (PVP) into the solution A, and dissolving to obtain a solution B; and carrying out electrostatic spinning, drying and pre-oxidation on the solution B, and sintering under an inertatmosphere condition to obtain the MoO2@C nanofiber flexible film material. The preparation method disclosed by the invention is simple, convenient and easy to control, low in energy consumption andless in pollution, and the thickness of the MoO2@C nanofiber film prepared by the method is controllable, so that a new method is provided for preparing a flexible self-supporting film material.

The invention relates to an application of a Mo modified Y molecular sieve in a C4 alkylation reaction. The Mo modified Y type molecular sieve catalyst can be obtained through impregnation loading, ion exchange and in-situ synthesis. The C4 alkylation reaction is an alkylation reaction of isobutane and butene, and the reaction temperature range is 60-90 DEG C, preferably 70-80 DEG C; the pressure range is from 1.5 MPa to 3.0 MPa, preferably from 2.0 MPa to 2.5 MPa; the weight hourly space velocity in terms of total butylene is 0.02-0.2 h <-1 >, preferably 0.05-0.1 h <-1 >; the ratio of alkane to olefin ranges from 50 to 300, and preferably ranges from 90 to 250. The Mo modified Y-type molecular sieve prepared by the invention can obviously improve the C4 alkylation reaction performance of the Y-type molecular sieve, prolong the reaction life and improve the average octane number of the product.