68results about How to "Particle size and" patented technology

The present invention describes methods for preparing high quality nanoparticles, i.e., metal oxide based nanoparticles of uniform size and monodispersity. The nanoparticles advantageously comprise organic alkyl chain capping groups and are stable in air and in nonpolar solvents. The methods of the invention provide a simple and reproducible procedure for forming transition metal oxide nanocrystals, with yields over 80%. The highly crystalline and monodisperse nanocrystals are obtained directly without further size selection; particle size can be easily and fractionally increased by the methods. The resulting nanoparticles can exhibit magnetic and/or optical properties. These properties result from the methods used to prepare them. Also advantageously, the nanoparticles of this invention are well suited for use in a variety of industrial applications, including cosmetic and pharmaceutical formulations and compositions.

The invention discloses a preparation method of an intelligent nano-foam oil-displacing agent. By grafting a temperature-sensitive polymer onto magnetic nano particle surfaces, compound nano particleswith the temperature-sensitive property and magnetic response are prepared, and the nano particles have the property of stabilizing foam. The oil-displacing agent has the characteristics that the hydrophilia and lipophilicity of the oil-displacing agent can be adjusted and controlled; when the formation temperature is high, the nano particles show the lipophilicity, and when the foam meets crudeoil, the foam bursts, which is beneficial to peeling the crude oil off a rock stratum surface and improving the recovery ratio; when the temperature is low, the nano particles show the hydrophilia, which is beneficial to separation of oil and water, and through an applied magnetic field, recovery of the nano particles can be fast achieved; moreover, the foam-displacing liquid can respond to the magnetic field, so that through the applied magnetic field, flow of the displacing liquid can be controlled.

The invention relates to a levocarnitine composition for injection and a preparation method of the levocarnitine composition; the levocarnitine composition is lyophilized powder containing levocarnitine and mannitol, wherein the weight ratio of the levocarnitine to the mannitol is 1:(0.75-1.25); the average particle diameter of the lyophilized powder is 90-130 nm, and the porosity is 94-98%. The preparation method comprises the steps of: 1) preparing: weighing levocarnitine and mannitol, putting the levocarnitine and the mannitol in a preparing tank, adding injection water, agitating to enable the levocarnitine and the mannitol to be completely dissolved and uniformly mixing, regulating the pH to 5.7-6.3 through a 0.1mol/L hydrochloric acid solution; 2) decarburizing and sterile filtering; 3) sterile packaging; 4) vacuum freeze drying to obtain the levocarnitine composition . The levocarnitine composition has the advantages of simple preparation, advanced technique, uniform quality, excellent stability, better redissolution capability and clinic medicine application safety.

The invention discloses a preparation method of adriamycin nano-drug particles, belongs to the field of drug preparation and provides an adriamycin containing solution and a proper anti-solvent. The adriamycin containing solution and the anti-solvent are put in a first storage tank for a drug solution and a second storage tank for the anti-solvent; the two kinds of liquid are conveyed out through a pump, flow through a flowmeter, enter a supergravity reactor at the same time and are sprayed to the rotating inner edge of a packing layer, so that adriamycin is recrystallized out through an anti-solvent precipitation crystallization method; adriamycin suspension liquid is collected, and adriamycin nano-drug powder is obtained after dialysis and freeze-drying. By the adoption of the method, the nanoscale adriamycin drug particles with a controllable average particle size and narrow particle size distribution can be obtained by using different surfactants, regulating the volume flow ratio of the two kinds of liquid, changing motor frequency and the like.

The process of preparing monodisperse nanometer metal oxide particle includes the following steps: 1. preparing solution with surfactant 0.25-1 weight portions and dispersing medium 2-10 weight portions, adding metal oxide to the concentration of 0.05-0.5 mol/L, and heating in the temperature raising rate of 3-6 deg.c/min to the nucleation temperature 150-300 deg.c to react for 0.5-3.5 hr; and 2. heating to the dispersing medium boiling temperature 210-370 deg.c in the temperature raising rate of 5-12 deg.c/min for controlling the growth and reflux reaction in boiling state for 0.5-5 hr to form the monodisperse nanometer metal oxide particle. The present invention realizes the preparation of monodisperse nanometer particle, and may be used in preparing different kinds of nanometer metal oxide particle.

The invention relates to a reduced nano-grade silver antibiotic finishing agent containing spherical polymer brushes, and a preparation method thereof. The spherical colloidal particles are prepared through steps that: nano-grade polystyrene microspheres are prepared through emulsion polymerization; the polystyrene microspheres are adopted as cores, and styrene sulfonic acid (SS) is further initiated, such that transition layers are formed; a photo-initiator 2-hydroxyl-2-methyl-1-phenyl-1-acetone (HMPP) is firmly adhered onto the polystyrene sulfonic acid layers under the effect of hydrogen bonds with which the particle sizes of the colloidal particles can be controlled by temperatures; polyethylene glycol methacrylate (PEGMA) is added, ultraviolet light radiation is carried out, such that polymerization is initiated, and shells are formed. The brush-shaped shells can be used for reducing and immobilizing nano-grade silver particles. The nano-grade silver particles have a narrow particle size distribution of 710nm. More importantly, the colloidal particles have good stability, such that the nano-grade silver particles can stably exist for a long time, and the antibiotic effect is good and long-lasting.

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 discloses an organic/inorganic composite microcapsule fire-extinguishing agent, and belongs to the field of fire-fighting materials. The organic/inorganic composite microcapsule fire-extinguishing agent comprises the following components in percentage by weight: 15 to 25 percent of monoammonium phosphate, 60 to 75 percent of ammonium sulfate, 0.5 to 1.5 percent of urea, 1 to 2.5 percent of potassium chloride, 4 to 9 percent of sodium silicate, 0.1 to 0.5 percent of fatty acid zinc, 0.2 to 0.5 percent of fatty acid magnesium and 1.5 to 2 percent of methyl silicane, wherein the sum of the components is 100 percent. According to the organic/inorganic composite microcapsule fire-extinguishing agent, grain diameters of the components are controlled, and the components are microencapsulated by a special process to prepare the fire-extinguishing agent, so that the fire-extinguishing agent cannot deteriorate after being used for 7 years and is inert at the temperature of less than 60 DEG C, and the standard of a product is applicable to international standard organization (ISO), European norm (EN) 615 and national standard (GB) 4066.2-2004; and the fire-extinguishing agent contains nutrient elements such as N, P, K and B which are required by plants and is absolutely harmless to human and animals, and microbes can be degraded within three days, so the organic/inorganic composite microcapsule fire-extinguishing agent is the most ideal 'reen' fire-extinguishing agent which is environment-friendly and low in cost and does not have carbon emission, is efficient in fire-extinguishing performance, wide in fire-extinguishing range and low in production cost and has high economic and social benefits.

The invention discloses a method for refining and grading lead powder. The method comprises the following steps of: crushing a lead pig to obtain lead powder by using a lead powder machine; refining the lead powder entering an air current classifier system through the air current classifier system and classifying the lead powder into rough lead powder and fine lead powder; allowing the rough lead powder and the fine lead powder to respectively enter different hoppers; feeding the lead powder into a paste combining machine by using the hoppers filled with the lead powder; adding an acid water anode accessory and uniformly mixing to obtain positive lead paste; feeding the lead powder into the paste combining machine by using the hoppers filled with the rough lead powder; and adding an acid water anode accessory and uniformly mixing to obtain negative lead paste. According to the method disclosed by the invention, during lead powder processing, the lead powder is fully refined as required and is classified into the rough lead power and the fine lead powder, thus the classification of proper refining and any proportion can be conveniently achieved according to the purposes and the requirements, the requirements of the anode on the mean particle size and narrower particle size of the lead powder can be fully met (the requirements of the cathode can be met simultaneously), the particle size distribution of the anode active substance lead powder and the cathode active substance lead powder is smaller, the uniformity of the active substances is improved, further the utilization rate of the active substance of the battery is improved and the service life of a battery pack is prolonged while the lead loss is reduced. Since the yield of the lead powder machine is in positive correlation with the mean particle size of the lead powder, the yield cannot be influenced while the quality of the lead powder is improved after a refining and classifying device is additionally arranged.