35results about How to "Uniform shape distribution" patented technology

The invention discloses a preparation method of a dopamine-modified glass fiber-epoxy resin composite material. The preparation method comprises preparing a dopamine hydrochloride solution, adjusting pH, immersing glass fibers into the dopamine hydrochloride solution, carrying out shaking in dark, cleaning the glass fibers, carrying out drying and blending the dopamine-modified glass fibers and epoxy resin to obtain the composite material. The preparation method adopts dopamine to modify the surfaces of glass fibers. The dopamine polymerization conditions are simple and the environment is mild. The dopamine on the surfaces of the modified glass fibers has uniform morphological distribution and controllable thickness. The dopamine self-polymerization process is simple, is easy to operate, has good reproducibility, realizes a low cost and realizes large-scale modification and application of the glass fibers. Through effective combination of the dopamine function group and the epoxy resin composite material, the dopamine-modified glass fiber-epoxy resin composite material having high performances is prepared.

The invention relates to a method for preparing a self pore-forming calcium phosphate cement bracket, which comprises the following steps of: 1) uniformly mixing calcium sulfate hemihydrate and tricalcium phosphate cement powder to obtain the mixed cement powder; 2) heating gelatin and NaH2PO4 with stirring in water at the temperature of between 45 and 50 DEG C until the gelatin and the NaH2PO4 are dissolved completely to obtain mixed solution; 3) uniformly mixing the mixed cement powder obtained by the step 1) and the solution obtained by the step 2), adding 25 to 50 percent aqueous solution of glutaraldehyde immediately, injecting the mixed cement powder slurry into a steel mould, then mixing the slurry at room temperature for 60 to 90 seconds, keeping the temperature of the slurry to be 37 DEG C after taking out, and then curing the slurry for 1 to 2 hours under the condition that the humidity is 100 percent to obtain the composite bracket. When the porosity is 71 percent, the average value of the compression strength can be increased to 8.1MPa; the bracket has high porosity and compression strength, and plays a better role in supporting in a human body, and the macropore diameter is between 100 and 300 mu m; and the self pore-forming calcium phosphate cement bracket prepared by the invention can be used as a repairing material of a human hard tissue.

The invention relates to the technical fields of microorganism fermentation and nano, and provides a bio-synthesis method of nano zinc oxide by utilizing lactic acid bacteria and a nano zinc oxide composite feed addictive. The invention utilizes lactic acid bacteria to synthesize nano grade zinc oxide, and then develops a novel feed addictive which is rich in nano zinc oxide. The addictive is applied to a feed for suckling pigs, and the addition amount is less than 1000 ppm (by the weight of zinc oxide). The addictive can effectively prevent animals from zinc poisoning and reduce the environmental pollution caused by zinc, can also effectively prevent weaned pigs from diarrhea and improve the health level of intestinal tracts through the co-function of lactic acid bacteria and zinc oxide, and can even wholly or partially replace the antibiotic to reduce the antibiotic residue so as to improve the food safety.

The invention relates to a preparation method and application of a photocatalyst, copper calcium titanate containing high-density oxygen vacancy. The preparation method includes: utilizing a one-step molten salt method; controlling morphology and oxygen vacancy content by changing molten salt composition during synthesis; using metal oxide as a raw material; grinding and calcining the raw material to form a high-purity photocatalyst; calcining before washing the high-purity photocatalyst. The preparation method has the advantages of few raw material type, simple operation, adjustable molten salt composition, mild condition and simple process. A copper calcium titanate photocatalysis material obtained by the preparation method is high in yield, uniform in distribution and free of introduction of other mixed elements; by introducing oxygen vacancy, compositing of photo-induced electron hole pairs can be inhibited effectively, and the material is endowed with excellent visible light photocatalysis performance and is better than a commercial star photocatalysis material, titanium dioxide (P25). The defect that visible light cannot be used due to wide oxide band gap is overcome, and the defect that sulfide is unstable is made up due to the characteristic that the catalyst is of a diamond-like structure.

The invention discloses process method and device for high-performance wire rod production, and belongs to the technical field of severe plastic deformation fine grains. The process method can obtaina finished product with an invariable section size through the steps of material selection and cleaning, ultrasonic impact strengthening treatment preparation, ultrasonic impact strengthening treatment, two-piece welding and multi-pass rolling treatment, and a finished product with a uniformly thinned section size can be obtained after one-time ultrasonic impact strengthening treatment; and a low-temperature ultrasonic rolling impact device comprises a closed container filled with cooling liquid, an ultrasonic transducer, an ultrasonic tool head, a rigid impact roller column, an ultrasonic power supply, a rigid roller, a roller driving motor, a pressure cylinder, a spring and a traction transmission mechanism. According to the process method, uniform and efficient grain refinement can be realized on a wire rod or a strip with the micron-sized thickness, and the comprehensive mechanical property of the material is obviously improved; and the device can realize the low-temperature ultrasonic impact SPD strengthening treatment of the wire rod or the strip and can meet requirements of two impact treatment modes.

The invention discloses a preparation method of a flame retardant of environment-protective fiberglass retardant nylon. At first, diammonium phosphate, phosphorus pentoxide, carbamide and a multi-amino group compound are added into a kneader according to a proportion and are reacted for 4 to 12 hours under an ammonia atmosphere to obtain modified APP; then the APP is dispersed in solvent and cation surface activator is added to carry out ion exchange reaction with cyanamide salt for 1 to 10 hours under the situations of micro-boiling and circumfluence of the solvent; after the reaction is finished, the nitrogen-phosphor flame retardant used for nylon is obtained after the reagent is cooled, filtered, washed and dried. The flame retardant prepared by the invention has more uniform chemical components, better thermal stability, more excellent compatibility with nylon as well as more excellent flame retardant performance and more reasonable price. No corrosive and poisonous compounds are generated during the use process of the flame retardant. The product prepared by the invention is mainly used as the flame retardant of fiberglass reinforced retardant nylon and fiberglass reinforced retardant polyester.

The invention provides a spherical nickel cobalt aluminum precursor, and belongs to the field of a positive electrode material of a lithium ion battery. The spherical nickel cobalt aluminum precursoris formed by radially grown prisms and has a radial pattern spherical appearance; the spherical nickel cobalt aluminum precursor has the chemical components of [a(Ni<x>Co<y>C<2>O<4>)].bAl(OH)<3>, wherein x is greater than or equal to 0 and less than or equal to 1, y is greater than or equal to 0 and less than or equal to 1; a x is greater than 0 and less than or equal to 1; b x is greater than orequal to 0 and less than 1; a+b is equal to 1; the spherical nickel cobalt aluminum precursor is 8-50 [mu]m in grain diameter; and the prism main phase is nickel cobalt oxalate and the surface is loaded with aluminium hydroxide granules. The scanning electron microscope analysis proves that the spherical nickel cobalt aluminum precursor provided by the invention has the radial pattern spherical appearance and is formed by the radially grown prism, with uniform dimension and appearance distribution and regular and tidy spherical structure; and the specific capacity of a nickel cobalt aluminum positive electrode material prepared from the spherical nickel cobalt aluminum precursor provided by the invention can reach 160 mAh.g<-1> and has relatively high cycle performance.

The invention provides a simple synthetic method for Ag2S-MoS2 sheet self-assembling composite spherical power and relates to the technical field of photocatalytic material preparation. The method comprises the following steps: dissolving amino acid, ammonium molybdate tetrahydrate, thiourea, silver nitrate and ammonium metavanadate in water and uniformly stirring and mixing; transferring the stirred mixed solution into a reaction kettle; covering the reaction kettle and placing into a constant-temperature airing oven for reacting; treating after ending the reaction, thereby acquiring black Ag2S-MoS2 sheet self-assembling composite spherical power. According to the invention, an amino acid auxiliary hydrothermal method is adopted for successfully acquiring the Ag2S-MoS2 sheet self-assembling composite spherical power; a series of experimental results prove that different amino acids as the templates and raw materials can be used for successfully preparing the Ag2S-MoS2 sheet self-assembling composite spherical power; the Ag2S-MoS2 sheet self-assembling composite spherical power has the characteristics of narrow size distribution, uniform morphological distribution, controllable grain size, and the like.

The invention provides a preparation method of particle self-assembled TiO2 / Fe2O3 chain-like compound powder and relates to the technical field of preparation of magnetically loaded titanium dioxide. According to the preparation method, a titanium source, soluble iron salt and glycine are used as reaction raw materials and are subjected to hydrothermal reaction to prepare the particle self-assembled TiO2 / Fe2O3 chain-like compound powder. The preparation method comprises the following steps: dissolving the titanium source into ethanol and adding the soluble iron salt, the glycine and water; after uniformly mixing, conveying a mixture into a reaction kettle and carrying out hydrothermal synthesis reaction; after reacting, carrying out post-treatment to obtain the product. A titanium dioxide loaded magnetic compound chain-like material is successfully obtained through a glycine biomolecule assisted hydrothermal method. A series of experiment results show that the glycine is used as a template and the raw materials, so that the magnetic titanium dioxide nano chain-like compound powder can be successfully prepared; the magnetic titanium dioxide nano chain-like compound powder has the characteristics of relatively narrow particle size distribution, uniform shape distribution, controllability and the like.

The invention discloses a preparation method for a regular-hexagonal-prism-shaped magnesium-doped zinc oxide film. The microstructure of the magnesium-doped zinc oxide film is in the shape of a regular hexagonal prism, and possesses the advantages that the crystallization degree is high and surface defects are less. The preparation method of the film comprises separately dissolving zinc acetate, magnesium acetate, triethanolamine and ammonia water in a mixture of glycol and ice water, getting proper amount of the solution and a cleaned substrate, transferring into a teflon inner container of a hydrothermal kettle for hydrothermal reaction, after the reaction is finished, performing washing, drying and annealing processing on the substrate, so as to prepare a layer of the regular-hexagonal-prism-shaped magnesium-doped zinc oxide film on the substrate. The preparation method is simple in technology, good in repeatability, low in cost, strong in controllability, low in synthesis temperature, green and friendly to environment. The obtained product is in the shape of a regular hexagonal prism, is good in crystallinity, high in purity, less in surface defects, uniform in morphology distribution and consistent in orientation, and possesses potential application prospect and scientific research value in the fields of photoelectric materials new energy.

The invention discloses a preparation method and application of a SbPO4 microsphere. The method comprises the steps of: under magnetic stirring, dissolving an ionic liquid ([BMIM]P) in 15mL of deionized water and stirring for 10min for complete dissolution; under magnetic stirring, dissolving 0.002mol of SbCl3 in the above prepared solution, and stirring for 30min to obtain a precursor; transferring the precursor to a reaction vessel, wherein the volume of the precursor filler content is 80%, sealing the reaction vessel and conducting constant temperature reaction in an oven; and after the reaction, respectively washing with ethanol and deionized water three times, and finally drying at constant temperature of 70 DEG C for 12h to obtain SbPO4 microspheres. The SbPO4 microsphere prepared by the invention has evenly distributed morphology and good UV catalytic activity; and the preparation method uses green pollution-free raw materials, has simple preparation process, short reaction time, mild reaction conditions, and broad application prospects.

The invention relates to a making method of a pickled Chinese cabbage ham sausage. The making method includes the following processing steps of pickled Chinese cabbage ham sausage formula material preparation, pickled Chinese cabbage preprocessing, primary stirring, pickling, secondary stirring, casing filling, sterilization and normal-temperature cooling. In the pickled Chinese cabbage ham sausage formula preparation step, prepared formula materials are composed of raw meat, pickling materials and auxiliary materials, and the raw meat is selected, unfreezed and minced. In the making method, pickled Chinese cabbages are processed by using the microwave vacuum drying and low-temperature liquid-nitrogen refrigeration technology, original color, aroma and taste of the pickled Chinese cabbages and nutritive value of the pickled Chinese cabbages are kept to the maximum limit, therefore, the made ham sausage has the peculiar flavor of the pickled Chinese cabbages, and the eating quality of the ham sausage is improved. The making method is simple and easy to implement; on the basis of the functions of a traditional ham sausage, nutritional ingredients and functional characteristics of the pickled Chinese cabbages are added, and the defects that existing ham sausages are greasy, high in fat, high in calorific value and low in nutrition are overcome, and the processed ham sausage benefits the stomach, reinforces intestines and is better in nutrition and flavor.

The invention discloses a preparation method of a MoO2 / Mo4O11 hybrid-phase nanometer electrode material. The preparation method comprises the step s of 1) dissolving a molybdenum source in an enough amount of alcohol-water mixed solvent according to a formula ratio, performing full stirring, and adjusting pH to 1-5 with an oxidization oxygen-containing acid; 2) performing solvothermal reaction onthe product, wherein the reaction temperature is 90-150 DEG C, and the reaction time is 6-24 hours; 3) cooling, washing and drying the product after reaction is completed; and 4) placing the product under an inert atmosphere of 500-800 DEG C for thermal processing for 1-3 hours to obtain a target product MoO2 / Mo4O11. The invention also discloses the MoO2 / Mo4O11 hybrid-phase nanometer electrode material. The material has conductivity similar to metal, the theoretical capacity of two phases is considerable, and the lithium ion battery electrode has great advantage. The method is simple to operate, and the prepared product is uniform in morphology distribution.

The invention discloses a preparation method of a nickel tungsten phosphide-nickel tungsten oxide with a heterostructure, which relates to the field of catalytic electrodes for energy conversion. The nickel tungsten phosphide-nickel tungsten oxide with the heterostructure is prepared on foamed nickel by adopting a hydrothermal method and a tubular furnace phosphating method. When water is electrolyzed in an alkaline medium, the material with the heterostructure shows excellent electro-catalytic hydrogen evolution performance and cycling stability as a cathode material, the current density of 10 mA / cm<2> can be reached only by 115 mV overpotential, and the hydrogen evolution catalytic activity of the material can be comparable with that of a noble metal platinum group catalyst. The heterostructure nickel tungsten phosphide-nickel tungsten oxide designed from the microscopic level is low in synthesis cost and simple and convenient in process, and has a good application prospect in the aspects of replacing a noble metal catalyst and large-scale implementation of hydrogen production by water electrolysis.

The invention belongs to the technical field of lithium ion battery materials, and particularly relates to a cobalt-free high-nickel positive electrode material and a preparation method thereof. The method comprises the following steps: preparing a soluble salt solution of coating layer metal, adding a complexing agent, adjusting the pH value, adding a cobalt-free high-nickel positive electrode material matrix, carrying out chemical plating reaction, and carrying out solid-liquid separation, drying and calcining to obtain the cobalt-free high-nickel positive electrode material. According to the invention, a chemical plating reaction method is adopted for coating, the anode material subjected to one-time sintering enters a container for chemical reaction to form a metal compound, so that the surface is coated with a layer of compact metal oxide. Compared with the prior art, the method is advantageous in that: the high-temperature coating or precipitation method coating effect is good, the coating uniformity of chemical plating reaction is stronger, and the cycling stability of the material is better.

The invention discloses a layered porous Fe 3 Se 4 @NC@CNTs composites and their preparation and application in sodium-ion batteries. Fe(NO 3 ) 3 , CNTs, CH 4 N 2 O, NaCl nanoparticles were encapsulated into the polymer fiber network and then calcined in protective gas to obtain hierarchical porous Fe 3 Se 4 @NC@CNTs Composites, Fe 3 Se 4 The nanoparticles are well coated in the porous carbon structure, and the CNTs are intertwined to form a 3D conductive network. The invention is easy to operate, the reaction conditions are controllable, the obtained 3D hierarchical porous structure is special, and the specific surface area is large, which not only facilitates the full contact between the electrolyte and the active material, but also effectively adapts to the volume expansion of the material during the charge and discharge process , when used as the anode material of sodium ion battery, its electrochemical performance is greatly improved.

The invention discloses a semi-dull material for a BOPP semi-dull transfer base film, and a preparation method and an application thereof. The semi-dull material comprises, by weight, 66.7-86.9 partsof PP resin, 8-18 parts of HDPE, 5-15 parts of a compatibilizer, and 0.1-0.3 part of an antioxidant. The invention also discloses a preparation method of the semi-dull material for the BOPP semi-dulltransfer base film. The preparation method comprises the following steps: proportioning materials, mixing the materials in a mixer for 8-10 min, carrying out melt extrusion to obtain strips, and pelletizing and drying the strips to prepare the finished granular product. The invention further discloses an application of the semi-dull material for the BOPP semi-dull transfer base film in the BOPP semi-dull transfer base film. The surface of a dull layer using the BOPP semi-dull transfer base film has uniform roughness and uniform raised or sunk morphology distribution, and the dull layer has a stable dull layer, has a good transfer effect and realize an excellent decoration effect.

The invention discloses a self-assembly nanosphere or hydrogel based on commercial amino acid and a preparation method thereof. The method provided by the invention comprises the following operating steps: taking a certain amount of commercial amino acid, dissolving by the use of dimethyl sulfoxide to obtain a stock solution, diluting by the use of a phosphoric acid buffer at a pH of 7.4, and performing ultrasound so as to obtain the nanosphere or hydrogel. The nanosphere prepared in the invention is simple and cheap, morphology and distribution of the nanosphere are uniform, and the size of the nanosphere is easy to regulate and control according to concentration. According to the prepared hydrogel, gelation can be realized only by ultrasound; and the hydrogel is not easy to deteriorate. The nanosphere and hydrogel obtained in the invention are based on the commercial amino acid which are cheap and can be obtained in quantity. In addition, the preparation method is simple and fast. The prepared material has good stability, and the preparation method paves the way for industrial application of the nanosphere and hydrogel.

The invention discloses a method for synthesizing CdSe / P3HT composite nanocrystals by adirect growth method. The method comprises the following steps of pouring 6 parts by weight of a polymer P3HT, 79 to 395 parts by weight of Se powder, 340 to 680 parts by weight of cadmium stearate, 1 part by volume of trichlorobenzene and 15 parts by volume of ODE into a reaction kettle for complete stirring, and performing reaction for 5 to 25h at 140 to 240 DEG C; performing acetone washing and precipitation, performing dissolution with n-hexane and performing washing and drying to obtain the CdSe / P3HT composite nanocrystals. According to the method, reaction temperature is remarkably reduced, so that implementation of industrial production is facilitated; the generated CdSe / P3HT composite nanocrystals are of a zero-dimensional nano-microsphere structure, are sized to be about 5 to 20nm, averagely about 5.3nm, are uniform in size and shape distribution and regular in arrangement, have higher photoelectric conversion efficiency and higher thermal stability, and can be decomposed at higher than 210 DEG C; moreover, use of an organic phosphonic compound which is high in toxicity and cost for a reaction system is avoided, so that the method is more environment-friendly and has higher practical significance in nowadays with promotion of green-chemistry.

The invention discloses a heat-insulating ultraviolet-resistant glass sticker film and a preparation method therefor. The preparation method comprises the steps: S1: dispersing a salicylate compound and PET resin into an aqueous solution of ethanol, so as to form a coating solution; S2: adding metal oxide solid particles into a fluidized-bed reactor, and introducing coating solution entrained supercritical carbon dioxide fluid to coat surfaces of the metal oxide solid particles with the salicylate compound and the PET resin, so as to obtain modified metal oxide solid particles; and S3: uniformly mixing the modified metal oxide solid particles, a couplant, additives and PET to form a casting solution, and pouring the casting solution into a mold, thereby obtaining the glass sticker film. According to the preparation method for the glass sticker film, disclosed by the invention, the heat-insulating and ultraviolet-resistant properties of the glass sticker film are improved, the global performance of the glass sticker film can be more uniform, the service life of the glass sticker film is prolonged, and thus, large-scale popularization and application are better facilitated.

The invention relates to the technical field of basic cupric carbonate micro-powder preparation and especially relates to a sheet-shaped self-assembled basic cupric carbonate flower-type ball and a simple preparation method thereof. The sheet-shaped self-assembled basic cupric carbonate flower-type ball is prepared from basic cupric carbonate nanosheets through assembling, the diameter of the flower-type ball is 1 to 10 microns, and the particle shapes of the flower-type balls are uniform. The preparation method comprises carrying out ultrasonic mixing on an aqueous solution of a soluble copper salt and an absolute ethanol-water solution of L-aspartic acid, putting the mixture in a constant-temperature blast oven, carrying out a reaction process and then treating the product to obtain a basic cupric carbonate flower-type ball powder material. The L-aspartic acid, the soluble copper salt, the anhydrous ethanol and the deionized water are mixed under ultrasonic agitation and undergo a hydrothermal reaction to produce the sheet-shaped self-assembled basic cupric carbonate flower-type ball. A series of characteristics show that the sheet-shaped self-assembled basic cupric carbonate flower-type ball produced through a system using L-aspartic acid as a template and a raw material has narrow particle size distribution, uniform distribution of morphology and controllability.

The invention discloses a preparation method of porous BiOCl / g-C3N4 heterogeneous nano-powder, and relates to the technical field of composite materials suitable for new energy and environmental sewage remediation. The preparation method comprises the following steps: putting urea or melamine into a quartz boat tightly wrapped by tinfoil, putting the quartz boat into a tubular furnace, carrying out a reaction, washing, and drying to obtain faint yellow porous g-C3N4 nano-powder; and ultrasonically dispersing a certain amount of g-C3N4 powder into a solvent to obtain a g-C3N4 turbid liquid, sequentially adding a certain amount of bismuth nitrate pentahydrate and potassium chloride into the g-C3N4 turbid liquid, continuously carrying out an ultrasonic reaction on the mixture of the g-C3N4 turbid liquid, the bismuth nitrate pentahydrate and the potassium chloride, and carrying out post-treatment to obtain faint yellow porous BiOCl / g-C3N4 heterogeneous nano-powder. According to the invention, the porous BiOCl / g-C3N4 heterogeneous nano-powder is successfully obtained by combining tubular furnace pyrolysis with an ultrasonic in-situ precipitation method, and has the characteristics of narrow particle size distribution, uniform morphology distribution, controllable particle size and the like.

The invention discloses a preparation method of a MoO2 / Mo4O11 hybrid-phase nanometer electrode material. The preparation method comprises the step s of 1) dissolving a molybdenum source in an enough amount of alcohol-water mixed solvent according to a formula ratio, performing full stirring, and adjusting pH to 1-5 with an oxidization oxygen-containing acid; 2) performing solvothermal reaction onthe product, wherein the reaction temperature is 90-150 DEG C, and the reaction time is 6-24 hours; 3) cooling, washing and drying the product after reaction is completed; and 4) placing the product under an inert atmosphere of 500-800 DEG C for thermal processing for 1-3 hours to obtain a target product MoO2 / Mo4O11. The invention also discloses the MoO2 / Mo4O11 hybrid-phase nanometer electrode material. The material has conductivity similar to metal, the theoretical capacity of two phases is considerable, and the lithium ion battery electrode has great advantage. The method is simple to operate, and the prepared product is uniform in morphology distribution.

The invention provides a preparation method of ultrathin chalcogenide glass. The preparation method comprises the following steps: prefabricated ultrathin chalcogenide glass with an average thickness D is provided; the prefabricated ultra-thin glass is fixed on a lifting device of a wire drawing tower, and the prefabricated ultra-thin glass is put into a wire drawing cavity, so that the lower part of the prefabricated ultra-thin glass is aligned with the center of a heating area of the wire drawing cavity; the temperature in the wire drawing cavity is a preset temperature T1, the prefabricated ultra-thin glass product is heated and softened, and the preset temperature T1 meets the condition that T1 is larger than Tg and smaller than Tx; the temperature of the heating area of the wire drawing cavity is kept at the preset temperature T1, and the prefabricated ultra-thin glass descends relative to the heating area of the wire drawing cavity through a lifting device of the wire drawing tower; in the descending process of the prefabricated ultra-thin glass, the heated and softened ultra-thin glass part leaves the heating area of the drawing tower and is cooled and annealed to the room temperature, and a chalcogenide ultra-thin glass product with the average thickness d is obtained. According to the preparation method, the defects of a micron-level ultrathin chalcogenide glass forming method in the prior art are overcome, and better flexibility and controllability are achieved.

The invention discloses a ceramic bullet-proof sheet and a preparation method thereof. The ceramic bullet-proof sheet is prepared from the following raw materials in percentage by mass: 94 to 96 percent of silicon carbide, 2.8 to 3.2 percent of maltodextrin and 1.8 to 2.2 percent of boron carbide. The ceramic bullet-proof sheet is prepared by the steps of weighing the raw materials according to the proportion, adding process water and completely mixing to obtain slurry, feeding the slurry into a pelletizing tower, performing spray pelletization to form granules, performing coarse and fine granule separation by a circular vibration sieve, putting the granules into a debugger, debugging the water content, pressing the granules by a press to form a bullet-proof sheet blank with the required specification, performing turning processing, putting into a non-pressure sintering furnace to sinter, grinding the plane and the vertical plane of the ceramic piece by grinding and milling equipment after sintering formation, and polishing to obtain the ceramic bullet-proof sheet with the required size and precision. The product provided by the invention is simple in burdening, adopts only two auxiliary materials, and is small in use amount and low in raw material cost; the production process has high controllability, parameters can be adjusted at any time, the product granularity and shape are distributed uniformly, the product has high hardness, small specific gravity and high ballistic performance, energy consumption in the production process is low, and the finished product ratio is high.

The invention discloses a heat-insulating and anti-ultraviolet glass film and a preparation method thereof. The preparation method is as follows: S1: dispersing a salicylate compound and a PET resin in an aqueous solution of ethanol to form a coating liquid; S2: dissolving the In the fluidized bed reactor, metal oxide solid particles are passed into supercritical carbon dioxide fluid entrained with coating liquid, so that salicylate compounds and PET resin are coated on the surface of metal oxide solid particles, and modified metal oxides are obtained. Oxide solid particles; S3: Mix the modified metal oxide solid particles, coupling agent, additives and PET uniformly to form a casting solution and pour it into a mold to obtain the glass film. The preparation method of the glass film of the present invention not only improves the heat insulation and anti-ultraviolet performance of the glass film, but also makes the overall performance of the glass film more uniform, prolongs its service life, and is more conducive to large-scale popularization and application.

The invention is a method for preparing a chrysotile nanofiber, comprising the steps of: using chrysotile commercial asbestos or asbestos gangue as raw materials, and purifying the raw material with water washing purification; mixing the purified raw material with anion surface active agent and water and soaking; dispersing; centrifugating and obtaining a white chrysotile nanofiber product by liquid-solid separation. And it can implement large-scale production and has a diameter generally 30-60 nm long, a length greater than 10 um, high purity, good crystallization degree, and relatively uniform appearance distribution.

The invention discloses a preparation method of a dopamine-modified glass fiber-epoxy resin composite material. The preparation method comprises preparing a dopamine hydrochloride solution, adjusting pH, immersing glass fibers into the dopamine hydrochloride solution, carrying out shaking in dark, cleaning the glass fibers, carrying out drying and blending the dopamine-modified glass fibers and epoxy resin to obtain the composite material. The preparation method adopts dopamine to modify the surfaces of glass fibers. The dopamine polymerization conditions are simple and the environment is mild. The dopamine on the surfaces of the modified glass fibers has uniform morphological distribution and controllable thickness. The dopamine self-polymerization process is simple, is easy to operate, has good reproducibility, realizes a low cost and realizes large-scale modification and application of the glass fibers. Through effective combination of the dopamine function group and the epoxy resin composite material, the dopamine-modified glass fiber-epoxy resin composite material having high performances is prepared.

A lanthanum-cerium co-doped neodymium-iron-boron isotropic bonded magnetic powder and a preparation method thereof, the chemical formula of the magnetic powder is expressed as: [RE 1‑x (LR) x ] a Fe 100‑a‑b‑c m b B c , where 0.05≤x≤0.7, 11≤a≤13, 0≤b≤1.55, 5.5≤c≤6.2, RE is Nd or a combination of Nd and any one or several rare earth elements except La and Ce, LR Represents rare earth elements La and Ce, M is Al and / or Nb. Wherein, the grain size of the magnetic powder is 20-70nm. The present invention uses relatively surplus and cheap rare earth lanthanum and cerium to partially replace the neodymium element in NdFeB, and controls the ratio of lanthanum and cerium and the ratio of lanthanum and cerium to neodymium, and adds an appropriate amount of Nb and / or Al elements to suppress α-Fe The precipitation can reduce the irreversible loss of magnetic flux and increase the coercive force. By combining the rapid quenching process and parameter control, while saving costs, it can also maintain good magnetic properties and make comprehensive and balanced utilization of rare earth elements.