38results about How to "Regular particle shape" patented technology

The invention discloses a preparation method for rate type artificial graphite negative-pole material with high energy density. The preparation method comprises the following steps: subjecting raw material cokes to coarse breaking and pulverizing directly or coarse breaking, high-temperature modifying and then pulverizing, and carrying out reshaping treatment, so as to obtain primary granules A; kneading the primary granules A and an organic carbon source, then, carrying out dynamic thermal coating, and carrying out screening, so as to obtain primary granules B; uniformly mixing the primary granules A with a binder, then, subjecting the mixture to granulating in a granulating reactor, and carrying out screening, so as to obtain secondary granules C; subjecting the primary granules B and the secondary granules C to graphitizing separately, and carrying out screening, so as to obtain graphitized primary granules B and graphitized secondary granules C; and uniformly mixing the graphitizedprimary granules B and the graphitized secondary granules C proportionally, and carrying out screening, thereby obtaining a finished product. The preparation method is simple in process and easy in quality control; and by applying the artificial graphite negative-pole material prepared by adopting the method to a lithium-ion battery, the lithium-ion battery is large in capacity, good in cycle andexcellent in quick charging performance.

The present invention discloses a microwave producing method for nano-silver or gold; the reactants are added into the reactor according to the proportion of 1 to 1; the reactants are silver nitrate or auric chloride acid and starch or sodium carboxymethyl cellulose; the reactor is put into a microwave oven; with a mixer of a rotation speed of 100/min and the microwave power of 0.3 Kw, the reaction time of the reactant starch is one hour while the time of the reactant sodium carboxymethyl cellulose is seven hours; the solution is dried by air or vacuum freeze or spraying after the reaction is over to produce nano-silver or gold powder or concentrated to nano-silver or gold colloid of the needed consistency through vacuum concentration. The present invention discards the ordinary reducing agent in thermochemical synthesis and takes the microwave heating to replace the traditional local heating method and realize homogeneous growing of nano-silver or gold; the grain size distribution of the nano-silver and gold is narrow and the grain shapes are regular; the method is widely used in biochemical and antiseptic material field.

A process for preparing the medical polyvinyl chloride resin with high polymerization degree includes such steps as adding vinyl chloride, trigger, disperser, assistant and water to reactor, polymerizing reaction, adding reaction-stopping agent, removing excessive vinyl chloride, centrifugal dewatering and drying.

The invention discloses a preparation method of a hexaazaisowurtzitane crystal. The preparation method of the hexaazaisowurtzitane crystal comprises the following steps of: carrying out wet-crushing onto explosives until the particle dimension is 0.1 micron to 5 microns, centrifuging, washing, freezing and drying the crushed materials; placing the material in the step I to a solvent for carrying out ultrasonic treatment, heating, re-filtering, washing and drying under the standing condition or the stirring condition to obtain a hexaazaisowurtzitane explosive crystal. According to the preparation method of the hexaazaisowurtzitane crystal, the high-quality explosive crystal product, which is prepared by a preparation technology adopting a two-step process including mechanical crushing and solvent thermal-induction growing, is regular in particle shape, jewel-shaped, uniform in particle dimension, smooth in surface, less in internal defects of the crystal, and lower in mechanical sensitivity. Besides, the preparation method of the hexaazaisowurtzitane crystal is simple in process, gentle in reaction conditions, good in reproducibility, high in yield and suitable for large-scale industrial production.

The invention relates to a method for preparing submicron polycrystalline diamond abrasive with narrow particle size distribution, which comprises the following steps: (1) preparing pulp; (2) reshaping; and (3) centrifugally grading. In the invention, a submicron diamond product can be prepared by reshaping polycrystalline diamond powder of a particle size of 0.5 to 10 micrometer in a planet mill, superfine mill or supersonic pneumatic mill and grading in a high-speed centrifugal machine, wherein the particle sizes of the product may be 0.125 micrometer, 0.25 micrometer, 0.5 micrometer, 0.75 micrometer, 1 micrometer and 1.5 micrometers. The performance of the product is represented by the narrow particle size distribution of the product and regular particle shape. The product of the method is very suitable for fine polishing of sapphire, precision ceramics, optical crystals and metal molds; and after a sapphire wafer for an LED substrate is polished by the 0.5-micrometer diamond prepared by the method, the surface roughness of the sapphire wafer is 2.81 nanometers. The method is short in production period and is convenient for enlarging production scale.

The invention discloses a composite graphite negative electrode material for lithium ion batteries and a preparation method thereof. The preparation method comprises the following steps: mixing a synthetic graphite raw material, a natural graphite raw material and an adhesive in a mass proportion of 100: (55 to 65): (3 to 7); under inert gas shielding, putting the mixed materials into a low-temperature surface modification reaction kettle, warming and stirring to obtain a cladding body; carrying out carbonizing treatment on the cladding body; enabling the cladding body through carbonizing treatment to enter into a fusing machine for normal temperature modification to prepare a fusing body, and carrying out graphitization treatment on the fusing body in inert gas to prepare the negative electrode material for lithium ion batteries. According to the graphite negative electrode material for lithium ion batteries disclosed by the invention, the specific capacity is not smaller than 355 mAh/g, and the first charging and discharging efficiency is more than 91.0%; and the graphite negative electrode material has relatively high gram volume, is extremely high in rate capacity and cycle performance and stable in performance, and can be widely applied to negative electrode materials of the lithium ion batteries.

The present invention is liquid benzene medium arc discharge process of preparing onion-shaped fullerene. Through arc discharge with liquid benzene as material and discharge medium, ferrocene as catalyst, deionized water as coolant, air as isolator and graphite rod as electrodes, inside arc discharge trough, and at DC voltage of 22V-25 V, current of 50 A and power of 800-1200 W, suspension solution is prepared; and through further filtering in a filtering machine, purification in a tubular high temperature furnace, grinding, sieving and vacuum drying, nanometer level onion-shaped fullerene is obtained at yield of 70 %. The nanometer level onion-shaped fullerene has regular layered molecule arrangement, powder size of 10-30 nm, stable chemical and physical properties and high graphitization degree, and may be used in many industrial fields.

The invention provides a preparation method of a monodisperse ferrum-acid-nickel-zinc nano material. In the method, acetylacetone nickel, acetylacetone zinc and acetylacetone ferrum are used as raw materials, octadecylamine is used as a ligand, diphenyl ether is used as a solvent, and thus the monodisperse ferrum-acid-nickel-zinc nano material is prepared by adopting high-temperature pyrolysis in an air atmosphere. The invention has the characteristics that the octadecylamine is adopted as one ligand and is also a solvent during reaction so that the raw materials are saved; the method has no need of nitrogen protection; and the conditional operation is simplified, and the preparation cost is lowered. The ferrum-acid-nickel-zinc nano material prepared by using the method has the advantages of high purity and regular particle shape, wherein the particles are both regularly approximate spheres, and the sizes of the nano particles are 6-12 nm.

The invention discloses a preparation method of special PVC resin for CPVC. The method includes the steps that water, a main dispersing agent, an assistant dispersing agent, a surface active agent, VCM, an initiating agent, an anti-fisheye agent and a pH regulating agent are added into a reaction kettle to be subjected to a polymerization reaction for 4.5-5.5 h at 50-65 DEG C, and then a terminator and an antioxidant are added into the reaction system at the same time to obtain the special PVC resin for CPVC. According to the special PVC resin, prepared through the method, for CPVC chlorination, the particle size distribution width of the resin is reduced, the particle shape of the resin is regular, and the inherent quality of the resin is improved. The polymerization reaction is stable in the production process, the quality repeatability of all batches of resin is good, and therefore the novel assistant compound preparation method can be applied to large kettle industrial production.

The method for preparing polyvinyl chloride resin by adopting composite dispersion system includes the following steps: adding vinyl chloride monomer and composite dispersion system into polymerization reactor, and making them produce polymerization reaction under the condition of conventional polymerization. The composition and weight ratio of said composition dispersion system are IB:IC:ID=1:0.60-0.70:0.17-0.42, in which IB is polyvinyl alcohol, IC is hydroxypropyl methyl cellulose and IC is PVA with low alcohol-solubility, for example one of LM-22 and LW-300.

The present invention discloses the production process of polyvinyl chloride resin specially for high antishock building material product. Composite polyacrylate latex grain is first prepared through multiple-step emulsion polymerization, then pH regulated to neutrality and grafting polymerized with vinyl chloride suspension to prepare vinyl chloride grafted acrylate copolymer. The copolymer may be used widely in specially shaped material, pipe, plate and other plastic building material with antishock performance requirement.

The invention belongs to the field of preparation of functional foaming materials. The invention particularly relates to a low-pressure kettle type preparation method of thermoplastic polyester elastomer foamed particles. The preparation method comprises the following steps: fully mixing initial materials, spraying a liquid foaming agent as a spraying liquid onto an obtained initial raw material mixture, granulating by a granulator, carrying out high-pressure heating and heat preservation treatment on obtained granules in a reaction kettle, carrying out normal-pressure high-temperature foaming, and filtering after full foaming to obtain the foamed particles.

The invention relates to a color printing toner and a preparation method thereof, and belongs to the technical field of toner preparation. The color printing tone is prepared from the following raw materials in parts by weight: 60-70 parts of pigment powder, 10-15 parts of modified starch, 10-20 parts of styrene-acrylic resin, 10-15 parts of talcum powder and 1-5 parts of sodium silicate. The preparation method comprises the following steps: mixing pigment powder, modified starch, talcum powder and sodium silicate evenly; carrying out ball-milling for 30-35 minutes; adding 100-110 parts of deionized water; adding styrene-acrylic resin, heating to 50-56 DEG C, and keeping for 50-55 minutes; cleaning with 8-10fold deionized water, filtering and drying into a granular material; and screening the material, selecting 2-10micron granules, and drying at 50-55 DEG C for 30-40 minutes, so as to obtain the product. The toner granules are regular and uniform in shape, clear to develop and image, distinct in color layer, suitable for different models, and relatively low in preparation cost; and industrialized production is easy to achieve.