37results about How to "Special physical and chemical properties" patented technology

The invention discloses a method for detecting various pesticide residues in tobacco by utilizing a multiwalled carbon nanotube. The method is characterized in that an organic solvent is used for extraction; the multiwalled carbon nanotube is used as a reverse solid phase dispersion adsorbent; the tobacco samples are purified through vortex and centrifugation; a high performance liquid chromatography-tandem mass spectrum coupled technology and a gas chromatography-tandem mass spectrum coupled technology are combined to realize the synchronous detection of various pesticide residues in the tobacco. According to the method, the multiwalled carbon nanotube is used as the reverse solid phase dispersion adsorbent, so that the purification effect, the influence on the adsorption of the target analyte due to the frequently-used polar adsorbents is eliminated while the matrix effects are reduced, and a cleaner solution is provided to decrease the maintenance of the instrument in the using process; the multiwalled carbon nanotube is low in preparation cost and less in dosage and has the effect of greatly reducing the experimental cost; the method provided by the invention has the advantages of being correct in measurement, high in sensitivity and good in repeatability, and has the effect of satisfying the requirement for rapidly analyzing and detecting the large batch samples.

The invention provides eye drops containing tafluprost. The eye drops comprise tafluprost and a hydrophilic polymer, wherein the hydrophilic polymer is selected from polycarbophil or carbomer and the content of the hydrophilic polymer is 0.4-1.0%. Medicament storage formed by the eye drops plays a role of slowly releasing medicaments, prevents medicaments from being rapidly eliminated, and improves the bioavailability. The preparation method of the eye drops is simple and feasible and suitable for industrial production.

A fruity cake with a wrapper comprises the wrapper and filling. The wrapper is mainly composed of the following raw materials by weight percent: 150-200 parts of glutinous rice flour or flour, 15-25 parts of sugar and 45-55 parts of fruit powder. The filling is mainly composed of the following raw materials by weight percent: 90-110 parts of fruit powder, 140-160 parts of modified starch, 4-7 parts of milky tea additive, 0.4-0.7 part of ethyl maltol and 140-160 parts of sugar. The invention has the advantages of long storage time and low production cost. Through the combination of the wrapper and the filling, the invention can have various tastes; after the products are cooked, the flavor is strong, the taste is soft, thick, smooth and sweet without oiliness after people eat the products, and the flavor is fresh and delicious with long aftertaste.

The invention belongs to the technical field of natural polymer functional material preparation, and discloses a temperature and pH dual-affected xylan-based hydrogel as well as a manufacturing method and application thereof. The temperature and pH dual-affected xylan-based hydrogel is prepared through the following steps: dissolving xylan by using hot water, so that a xylan solution is obtained; adding N-isopropylacrylamide and acrylamide into the xylan solution, adding a crosslinking agent, feeding nitrogen for bubbling, adding a photoinitiator, uniformly mixing, cooling the obtained mixture to room temperature, putting the obtained mixture into an ultraviolet radiation reactor, carrying out ultraviolet irradiation at room temperature, carrying out closed placement and reaction at room temperature, and after the reaction is completed, washing the obtained product by using deionized water, so that an obtained solid is the temperature and pH dual-affected xylan-based hydrogel. The preparation process and method of the hydrogel disclosed by the invention are easy to operate, and the hydrogel has environmental friendliness; and the obtained temperature and pH dual-affected xylan-based hydrogel has biocompatibility, and has good sustained-release behavior on medications, and the release of medications in a simulated intestinal physiological fluid is up to 80%.

The invention, which belongs to the technical field of tobacco component detection, relates to an analytical method for quantitatively measuring super-multi-target aroma components in tobacco. The method comprises the following steps that: a tobacco sample is immersed in an acidic buffer solution and extraction is performed by an organic solvent; a multi-walled carbon nanotube is used as a reversesolid phase-dispersed adsorbent and vortexing and centrifugation are performed to purify the sample; and then simultaneous detection of 345 kinds of aroma component in tobacco is realized by combining gas chromatography-tandem mass spectrometry. The method has advantages of simple and rapid operation, high flux, low cost, low solvent dosage, good environmental friendly effect, wide range of analytical compounds, high accuracy, high precision, high sensitivity and high repeatability and can satisfy the demand of rapid detection and analysis of aroma component in tobacco.

The invention relates to the field of preparation of dielectric materials and particularly relates to high-tetragonal barium titanate doped with rare earth neodymium and a preparation method thereof. The preparation method includes the steps of: a) respectively preparing a barium acetate solution, a rare earth neodymium salt solution, and a titanium alkoxide solution, and stirring the titanium alkoxide solution for 10-20 min and adding triethanolamine to prepare a first solution; b) adding glacial acetic acid, intensively stirring the solution to prepare a second solution; c) successively adding the barium acetate solution and the rare earth neodymium salt solution to the second solution, and intensively stirring the mixture to prepare a sol solution; d) heating the sol solution in a water bath pot at 50-60 DEG C for 30 min to prepare wet gel; e) drying the wet gel in a vacuum-drying box at 100-120 DEG C for 6-7 h to prepare dry gel; and f) thermal-treating the dry gel, wherein the temperature is increased to 1200-1300 DEG C at the rate of 5-7 DEG C / min and then is maintained, and finally cooling the treated gel to room temperature in a furnace. The method solves the problems of particle aggregation, low content of the tetragonal phase and low dielectric constant of the barium titanate product in the prior art.

The invention discloses an ophthalmic preparation of sirolimus or a derivative thereof, the ophthalmic preparation includes the following raw materials by weight: 0.02 to 0.2% of everolimus and the sirolimus; 0-3% of a solvent; 0-7% of an emulsifier and a surfactant; 0-8% of an osmotic pressure regulator; 0-0.5% of a pH regulator; 0-5% of an antibacterial agent; 0-2% of a thickening agent; and balance of purified water, wherein the solvent and the emulsifier and the surfactant are not simultaneously zero. The ophthalmic preparation of the sirolimus or the derivative thereof is simple in preparation, suitable for industrial production, convenient in application and good in application prospects.

The invention relates to a gas chromatography-tandem mass spectrometry analysis method for flavors and fragrances used for tobaccos, and belongs to the technical field of the ingredient detection of flavors and fragrances used for tobaccos. The method is characterized in that: after a sample of flavors and fragrances used for tobaccos is diluted by ultrapure water and is extracted by organic solvent, a multi-wall carbon nanotube is used as reverse solid phase dispersion adsorbent, the sample is purified by the vortex and centrifugation, and a gas chromatography-tandem mass spectrometry technology is combined for realizing the simultaneous detection of 345 fragrance ingredients in the flavors and fragrances used for tobaccos. The method has the advantages of being simple and quick in operation, high in flux, low in cost, small in solvent dosage, friendly to environment, wide in analyzable compound range, high in accuracy, good in precision, high in sensitivity, good in repeatability andthe like, and can meet a requirement on quickly analyzing and detecting the ingredients of the flavors and fragrances used for tobaccos.

The invention discloses hydrogel with wet-state adhesion property as well as a preparation method and application thereof. The hydrogel with the wet-state adhesion property is prepared from the following raw materials in parts by mass: 100 parts of acrylic acid, 10 parts to 30 parts of quaternized xylan, 3 parts to 6 parts of tannic acid, 0.1 part to 1 part of a cross-linking agent, 0.1 part to 1 part of an initiator, and 150 parts to 400 parts of water. The hydrogel disclosed by the invention has excellent mechanical property and underwater adhesion property, and is environment-friendly, the preparation method is simple, and industrial large-scale production is easy to realize.

The invention belongs to thel field of magnetic composite material synthesis technology, and particularly discloses a preparation method of a magnetic ordered mesopore Fe3O4@MCM-48 composite adsorbingmaterial. The preparation method includes steps of combining a ferrite Fe3O4 grain and a mesoporous molecular sieve MCM-48; roasting in a muffle furnace at 450-650 DEG C, so as to obtain the Fe3O4@MCM-48 magnetic mesopore composite adsorbing material with a core-shell structure. The method is low in cost, low in toxicity, simple in operation, gentle in condition, and short in consumed time; the prepared material has magnetism and the mesoporous duct of the molecular sieve; the preparation method has huge prospect in absorption and separation, and drug carrier.

The invention discloses a novel compound thickener applied to food and belongs to the field of food additive preparation and application. The thickener is a mixture of different types of starch and hydrophilic colloids and serves as an additive for fruit flesh beverages. The thickener has a low cost and an excellent application effect, helps improve quality and structure of food systems, improves storage stability, retains original flavor of food and provides special physicochemical properties without needing any chemical, overcomes the problem of poor performance of natural starch, satisfies the need for natural food, reduces the application of modified starch in food industry and has good application prospects in food industry.

The invention relates to a coalescence material for emulsified water as well as a preparation method and application of the coalescence material. The coalescence material for the emulsified water includes a substrate and a fluorine-containing polyurethane coating layer coating the surface of the substrate. The fluorine-containing polyurethane coating layer of the coalescence material contains a hydrophobic fluorine-containing chain segment and a hydrophilic chain segment, thereby having hydrophobic and lipophilic characteristics in the air; the contact angle between the fluorine-containing polyurethane coating layerandwater drops is 100-120 degrees, the contact angle between the fluorine-containing polyurethane coating layerandoil drops is 50-80 degrees, the contact angle of water under oil changes dynamically and decreases from 120-150 degrees to 50-80 degrees within 2 min, so that favorable conditions are provided for demulsification mixingof liquid drops in a water-oil emulsion, andcompared with other fluorocarbon materials in the prior art, the coalescence material provided by the invention has a significantly better coalescence and separation effect on the emulsified water; and the coalescence material is suitable for the separation of the water-oil emulsion containing different types and different concentrations of surfactants, and the water-oil separation efficiency isas high as 91-98%.

The invention discloses a topological structure polymer, and a preparation method and application thereof. The invention provides a topological structure polymer disclosed as Formula 2 or Formula 2', wherein n represents polymerization degree, and n=10-250. The preparation method of the topological structure polymer is simple to operate, has wide monomer application range, can remove bis thioester group or xanthate group on the polymer, enhances the physicochemical properties of the polymer, and widens the application prospects of the polymer. The topological structure polymer without the terminal bis thioester group or terminal xanthate group has the advantages of lower molecular weight and narrow molecular weight distribution. Compared with the traditional high-molecular-weight topological structure polymer or linear polymer, the topological structure polymer disclosed by the invention has special physicochemical properties. For example, the topological structure polymer has higher solubility in carbon dioxide, and thus, is suitable for application as a carbon-dioxide-philic chain segment in related aspects (for preparing a carbon dioxide thickener, for preparing a carbon dioxide aqueous emulsion or the like).

The invention discloses a nanocomposite, a method for preparing the nanocomposite, and a lithium ion battery. The nanocomposite is composed of a polyaniline nanolayer at the top, a TiO2 / oxidized graphene composite layer at the centre and a polyaniline nanolayer at the bottom, wherein the polyaniline nanolayer is a nanometer-rod-shaped polyaniline array; the TiO2 / oxidized graphene composite layer is formed in a manner that TiO2 nano-particles are distributed in the net structure of multi-layer oxidized graphene. The nanocomposite disclosed by the embodiment of he invention is good in cycling stability and high-rate discharge performance, nontoxic, environmentally friendly, and cheap in price; the preparation method of the nanocomposite is easy to operate, environmentally friendly and high-efficiency.

The invention discloses a preparation method of high-strength nanocellulose / alginic acid composite hydrogel, and belongs to the field of polymer functional materials. The method comprises the following steps: adding sea squirt cellulose into an acid solution, and reacting to obtain sea squirt cellulose nanocrystals; adding an etherification reaction catalyst and a cationic etherifying agent into the sea squirt cellulose nanocrystal suspension, and carrying out cross-linking reaction to obtain positively charged sea squirt cellulose nanocrystals; preparing a solution containing positively charged sea squirt cellulose nanocrystals and sodium alginate, uniformly mixing, defoaming, forming a film by a tape casting method, and soaking the film in a calcium chloride solution with the concentration of less than 0.1 M to obtain preformed hydrogel; and stretching the preformed hydrogel, and soaking the stretched preformed hydrogel in a calcium chloride aqueous solution with the concentration of more than 0.5 M for fixation to obtain the high-strength nanocellulose / alginic acid composite hydrogel. The preparation process is simple, the raw materials are wide in source and low in cost, and the obtained composite hydrogel is excellent in mechanical property.

The invention discloses a Ce-Ag / BiOCi composite sterilization material for fitness equipment. The Ce-Ag / BiOCi composite sterilization material is synthesized by utilizing raw materials including bismuth nitrate pentahydrate, potassium dichromate, silver nitrate, cerium nitrate and the like through a method including the steps of carrying out acid-alkali treatment, heating in a water bath, calcining and the like.

The invention discloses a preparation method of a core-shell structure particles of electro-conductive macromolecule coated polymer microspheres, wherein the preparation method includes the steps: (1)mixing a first monomer, polyvinylpyrrolidone and distilled water, adding a first initiator after ultrasonic treatment, carrying out a stirring reaction, and separating to obtain polymethyl methacrylate microspheres; (2) taking the polymethyl methacrylate microspheres to mix with deionized water, carrying out ultrasonic treatment to mix evenly, and preparing a polymethyl methacrylate microsphere colloidal solution with the concentration of 0.5-10 wt%; and (3) adding a surface modifier to the polymethyl methacrylate microsphere colloidal solution at the temperature of 20-50 DEG C, stirring for10-20 h, then adding a second monomer, continuing to stir for 3-10 h at the temperature of 0-10 DEG C, adding a second initiator and hydrochloric acid, carrying out a reaction for 10-24 h at the temperature of 20-50 DEG C, and separating to obtain the product. The invention also provides the core-shell structure particles of the electro-conductive macromolecule coated polymer microspheres preparedby the method.

The invention discloses a transmission line tower fluorocarbon coating having resistance to ultraviolet rays and ageing, and a preparation method thereof. The fluorocarbon coating comprises fluorocarbon resin, a color filler, a dilution solvent, an assistant and a curing agent. The transmission line composite material tower fluorocarbon coating has a scientific and reasonable ratio, and can be sprayed on the surface of a transmission line tower to obtain a fluorocarbon coating layer having resistance to ultraviolet and ageing. The normal temperature fluorocarbon coating has the following advantages: (1) the construction process is simple and does not need thermal chemical reaction curing, the coating can be directly sprayed at the construction site and is naturally cured during construction, and technologic requirements are very simple; 2) the normal temperature fluorocarbon coating has same performances, remarkably more simple and remarkably less construction cost than a high temperature fluorocarbon coating; and (3) the construction is convenient, the construction cost is significantly reduced, construction is not affected by the environment or the size of a substrate, and manpower and material resources in the construction process are reduced.

The invention provides an eye drop containing tafluprost, comprising tafluprost and a hydrophilic polymer, wherein the hydrophilic polymer is selected from polycarbophil or carbomer, and the hydrophilic polymer The content of the substance is 0.4 to 1.0%. The drug depot that can be formed by the eye drops of the present invention has the effect of slowly releasing drugs, avoids rapid elimination of drugs, and improves bioavailability; the preparation method of the eye drops is simple and easy, and is suitable for industrial production.

The invention discloses a high-efficiency herbal eye drop, and belongs to the field of pharmaceutical chemicals. The high-efficiency herbal eye drop contains the following components in parts by weight: 80-100 parts of water, 50-60 parts of polycarbophil AA, 30-40 parts of oxytetracycline, 25-30 parts of tafluprost, 20-25 parts of timclol maleate, 18-23 parts of herba houttuyniae extract, 16-21 parts of flos lonicerae extract, 13-18 parts of semen cassiae extract, 11-16 parts of rhizoma coptidis extract, 9-13 parts of sodium chloride, 6-11 parts of edetate disodium, 6-9 parts of poloxamer, 5-8parts of tyloxapol, 4-8 parts of timclol maleate, 4-6 parts of brinzolamide, 2-5 parts of mannitol, 2-5 parts of citric acid, 2-4 parts of sodium citrate, 1-3 parts of benzene, and 1-3 parts of a preservative. The high-efficiency herbal eye drop solves the problems that a traditional herbal eye drop has poor absorption and a poor effect, and a chemical preparation eye drop hurts eyes.

The invention belongs to the technical field of magnetic composite material synthesis, and concretely discloses a preparation method of a CoFe2O4-at-MCM-48 magnetic mesoporous material of a core shellstructure. Ferrite CoFe2O4 particles and mesoporous molecular sieves MCM-48 are combined; the materials are roasted in a muffle furnace at 450 to 650 DEG C; the CoFe2O4-at-MCM-48 magnetic mesoporousmaterial of the core shell structure is obtained. The method provided by the invention has the advantages that the cost is low; the toxicity is low; the operation is simple and convenient; the conditions are mild; the time consumption is short; the prepared material has magnetic performance and has mesoporous pore passages of the molecular sieves; huge prospects are realized in the aspects of adsorption separation and medicine carriers.

The RE fodder additive consists of RE nitrate 35-45 wt%, RE chloride 35-45 wt%, sodium humate 4.5-5.5 wt%, ferrous sulfate 0.75-0.85 wt%, manganese sulfate 0.35-0.45 wt%, zinc sulfate 0.35-0.45 wt%, sodium citrate 1.5-2.5 wt% and Chinese medicinal stone 10-13 wt%. The additive has RE nitrate, RE chloride and sodium humate as main material, Chinese medicinal stone with nourishing health care function as supplementary material and trace elements essential for animal to grow, and can activate the growth factor in animal body, promote enzyme conversion, raise fodder converting rate, speed the growth of animal and strengthen the immunity of animal. Sodium humate added as biological stimulator can regulate the gastrointestinal function of animal, promote digestion, prevent disease and raise immunity.

The invention belongs to thel field of magnetic composite material synthesis technology, and particularly discloses a preparation method of a magnetic ordered mesopore Fe3O4@MCM-48 composite adsorbingmaterial. The preparation method includes steps of combining a ferrite Fe3O4 grain and a mesoporous molecular sieve MCM-48; roasting in a muffle furnace at 450-650 DEG C, so as to obtain the Fe3O4@MCM-48 magnetic mesopore composite adsorbing material with a core-shell structure. The method is low in cost, low in toxicity, simple in operation, gentle in condition, and short in consumed time; the prepared material has magnetism and the mesoporous duct of the molecular sieve; the preparation method has huge prospect in absorption and separation, and drug carrier.

The invention belongs to the technical field of preparation of natural polymer functional materials, and discloses a xylan-based hydrogel with dual response to temperature and pH, a preparation method and application thereof. The preparation steps of the temperature and pH dual-response xylan-based hydrogel are: dissolving xylan in hot water to obtain a xylan solution; adding N-isopropylacrylamide and propylene to the xylan solution Amide, then add cross-linking agent, blow nitrogen gas, add photoinitiator, mix evenly, cool to room temperature, place in ultraviolet radiation reactor, irradiate with ultraviolet light at room temperature, then seal and place reaction at room temperature, after the reaction After washing with deionized water, the obtained solid is the xylan-based hydrogel with dual response to temperature and pH. The preparation method of the present invention is easy to operate and has environmental friendliness; the obtained xylan-based hydrogel with dual response to temperature and pH has biocompatibility, good slow-release behavior for drugs, and releases drugs in simulated intestinal physiological fluid The amount reaches 80%.

The invention provides a medicine for treating eyesight. The medicine comprises the following components in parts by weight: 10-20 parts of gel; 1 to 15 parts of sodium hyaluronate; 1 to 3 parts of lutein; 3-5 parts of glycerol; 6-9 parts of a rhodiola rosea extract; 5-10 parts of a suberect spatholobus stem extract; 3-8 parts of a chamomile extract; 3-8 parts of a garden balsam stem extract; 6-9parts of a cassia seed extract; 5-8 parts of an astragalus extract; and 8-10 parts of a radix clematidis extract. According to the medicine, a traditional Chinese medicine and western medicine combined technology is utilized, traditional Chinese medicine extracts and western medicines are scientifically combined according to a formula, the treatment effect is good, and drug resistance is not likely to be generated. The medicine can relieve visual fatigue, treat ocular pseudoapproximation, relieve amblyopia and radically treat visual impairment such as eye dryness, eye itching and eye distension.

The invention provides a low start threshold magnetic memory alloy and a preparation method thereof. Compared with existing materials, the low start threshold magnetic memory alloy has the advantagesof excellent mechanical properties and magnetoelastic strain low start threshold. The chemical formula of the alloy is Co<x>Al<y>Ni<z>Pr<j>, wherein x is greater than or equal to 32.8 and is less thanor equal to 39.7, y is greater than or equal to 32.5 and is less than or equal to 37.6, z is greater than or equal to 28.3 and is less than or equal to 32.4, j is greater than or equal to 0.6 and isless than or equal to 1.2, x plus y plus z and plus j is equal to 100, and x, y, z and j represent molar percentage content. Compared with the existing materials, the magnetically controlled shape memory alloy forms a Co19Pr5 intermetallic compound with a coherent ultrafine dispersion distribution in a matrix phase of the alloy, so that the alloy has both the characteristics of good mechanical properties and magnetic properties, and the alloy is promoted to have the characteristics of both excellent mechanical properties and low start threshold, and the industrial application range of the typeof alloy is greatly broadened.