59results about How to "Meet particle size requirements" patented technology

The invention relates to a preparation method for a particle diameter controllable millimeter-scale polyurea monodisperse microsphere. The preparation method comprises the following steps: isocyanate compound is adopted as a monomer and is squeezed through syringe needles or capillary tubes to form liquid drops and the liquid drops are added into water or a polyamine aqueous solution for sedimentation and polymerization; during the settlement process of the liquid drops, the monomers on the surfaces of the liquid drops react with the water or the polyamine aqueous solution rapidly to form a gelatin layer or callus and the stability of particles is maintained. According to the method, as water is adopted as the dispersion medium, no pollution is generated; the polymerization reaction can be conducted under lower temperature, the equipment is simple and the manufacturing cost is low; the obtained microsphere is free from residual monomer and the post-processing is simple; no surface modified agent or pore-foaming agent is needed, porous polyurea microsphere with rich amino on the surface is prepared in one step; the method can be used in the fields of enzyme immobilization, chemocatalysis, dye, adsorption and separation of heavy metal ions and the like.

The invention relates to a method for preparing micro-sized monodisperse polyuria microspheres. The method comprises the following steps of: adding a mixed solvent of water and acetone and a diisocyanate compound monomer to a reaction flask at room temperature, wherein the weight ratio of the water to the acetone is 2/8-6/4, and the diisocyanate compound monomer accounts for 0.5-10.0 percent of the total weight of a mixed system; hermetically shaking up; putting in a constant-temperature water-bath vibrator; performing a polymerization reaction under the conditions that the vibration frequency is 70-150 times per minute and the temperature is 20-80 DEG C; and performing centrifugal separation and drying on a product after polymerization is ended to obtain the micro-sized monodisperse polyuria microspheres. According to the method for preparing the micro-sized monodisperse polyuria microspheres, precipitation polymerization is performed under the vibration condition by using only one monomer, thereby, the process is simple, the raw materials are single, the consumed reaction time is short, the monomer can be completely converted, and the yield of the microspheres can reach at least86 percent. All the microspheres are clean in surface and contain a large amount of amido and can be used for the field of protein adsorption and separation, enzyme immobilization and chromatographicanalysis.

The invention provides an ultrasonic wave and pressure rotary atomizer, comprising an ultrasonic wave energy converter and a pressure rotating liquid nozzle, wherein the ultrasonic wave energy converter comprises an energy converter back cover plate, a pretightening bolt and a pretightening nut, piezoelectric crystal and a nozzle front cover; the pressure rotating liquid nozzle comprises a drainage member, a gasket, a swirl member and a nozzle head; the piezoelectric crystal is clamped between the nozzle front cover and the energy converter back cover plate by the pretightening bolt and the pretightening nut; the nozzle head is installed on the drainage member and arranged at the front end of the nozzle front cover; the drainage member and the swirl member are arranged in the nozzle head; the gasket is clamped between the drainage member and the swirl member; an O-shaped seal ring is arranged between the nozzle head and the nozzle front head; and a swirl chamber is arranged in the middle of the swirl member. The atomizer can further generate liquid drops the Sauter diameters of which are several microns to one micron on the basis of the pressure rotating nozzle, thereby overcoming the pressure bottleneck of the pressure rotating nozzle after the size of the liquid drop is decreased to a certain degree.

The invention relates to the technical field of crushing treatment for hard plastic waste products, in particular to a recycling and crushing treatment machine for plastic products and a method of use. A No.1 transmission wheel is driven to rotate by a servo motor, and a No.2 transmission wheel is rotated by a transmission belt; the coaxial cam of the No.2 transmission wheel rotates along there-with and acts on a right pressure plate, a No.4 rod drives a blocking plate to move left and right with a spring to intermittently block a feeding opening to realize intermittent blanking, which is convenient for subsequent swing crushing action; the servo motor also drives a worm wheel to rotate, and the worm wheel rotates a No.1 rod to make No.2 and No.3 rods swing, thereby driving a rocking plateto swing left and right; the falling plastic products are crushed in cooperation with a left plate, the broken plastic products fall into a loading barrel through the guide of a guide plate and a guide tube, and are filtered through a screen, and plastic products that meet the requirements of particle size can be obtained by collection at the bottom of the screen.

The invention belongs to the technical field of nanocomposite materials, and discloses high-performance metal and ceramic composite powder used for feeding of a thermal spraying structure and a preparation method for the high-performance metal and ceramic composite powder. The method comprises the steps that (1) 20-40wt% of TiB2 powder and 60-80wt% of NiCrCoAlY powder are uniformly mixed so as to obtain NiCrCoAlY-TiB2 mixed powder; (2) the NiCrCoAlY-TiB2 mixed powder and a process control agent are put into a ball mill, are subjected to wet milling in an inert gas atmosphere, are dried and are cooled so as to obtain composite powder; and (3) ball milling treatment is carried out on the composite powder under the inert gas atmosphere, and plasma spheroidization is carried out so as to obtain the high-performance metal and ceramic nano composite powder. The composite powder has the advantages of being resistant to high temperature, wear, thermal fatigue, corrosion and high-temperature oxidation, the fluidity and density are good, and the particle size is mainly concentrated at 5-50 microns. The preparation method has the advantages of being simple and easy to operate and environment-friendly.

The invention provides sirolimus micro-emulsion particles and a preparation method and an application thereof. The sirolimus micro-emulsion preparation and sirolimus micro-emulsion particles are prepared from the following steps: mixing an emulsifier, a co-emulsifier and water; adding sirolimus into the mixture obtained, and heating up to a melting state at a temperature ranging from 70 DEG C to 90 DEG C; shearing and stirring the mixture in the melting state by adopting a high speed tissue stamping machine, wherein the shearing and stirring rotating speed is 8000-12000r/m, and the shearing and stirring time is 10-30 minutes to obtain an initial micro-emulsion; circularly emulsifying the initial micro-emulsion to obtain a micro-emulsion; and drying the micro-emulsion to obtain the sirolimus micro-emulsion particles. The stability of the sirolimus preparation provided by the invention is improved, the dissolution rate of the preparation is improved, and the bioavailability is increased.

The invention relates to a method for preparing micro-sized monodisperse polymer microspheres in static condition. The method comprises the steps that diisocyanate monomers and a water-acetone mixed solvent are added into a reaction bottle, wherein the mass ratio of water to acetone ranges from 20/80 to 60/40, and the diisocyanate compound accounts for 0.5-13.0% of the total mass of the polymerization system; after the reaction bottle is sealed and the mixed solvent is shaken up, the reaction bottle is placed in thermostatic waterbath of 20-80 DEG C for polymerization; after polymerization, the products are centrifugalized and dried to obtain the micro-sized monodisperse polyurea microspheres. The method for preparing micro-sized monodisperse polymer microspheres in static condition has the advantages that one monomer is used for precipitation polymerization completely in static condition without any stirring or oscillation, so that the reaction time is short, the monomer can be transformed completely, the yield of microspheres is high, and the operation is simple; the method is conducive to scale production of monodisperse microspheres; and the produced microspheres have clean surfaces and a large amount of amido, and can be used in various fields of protein adsorption and separation, enzyme immobilization, chromatographic analysis and the like..

The invention relates to a high-yield preparation method of functional monodisperse polyurea microspheres. The method adopts a precipitation polymerization process and comprises the following step: with water and acetonitrile as solvents and isophorone diisocyanate as monomers, reacting isocyanate with the water to prepare the monodisperse polyurea microspheres with rich amine groups on the surfaces. According to the method, single raw material is used, the reaction time is short, the monomers are completely converted, and the monomer content and the microsphere yield during preparation of the monodisperse microspheres are remarkably increased; the microsphere preparation process can be carried out in a complete standing condition, the functional polyurea microspheres can be obtained in one step without any surface modification, the process is simple, and the obtained microspheres can be used in the fields of enzyme immobilization, chemical catalysis, chromatographic analysis and the like.

The invention discloses a preparation method of a propofol fat emulsion injection. The preparation method comprises the following steps: uniformly mixing soybean oil, lecithin and oleic acid and adding propofol; spraying an oil phase into a water phase under the protection of nitrogen gas to prepare emulsion; shearing the emulsion to obtain primary emulsion; homogenizing the primary emulsion under the pressure of 10000psi-20000psi to prepare an emulsion semi-finished product; and filtering, inflating nitrogen and sterilizing to prepare the propofol fat emulsion injection. According to the preparation method, the grain diameter uniformity is enhanced and the disadvantage that the grain diameter deviation of the primary emulsion is too great is improved; the stability of finished-product emulsion is improved; the average grain diameter of the detected emulsion is 210nm-230nm and the grain diameter deviation is 0.20-0.30; the requirements on the grain diameters by the fat emulsion injection are met; the emulsion grains with the size being more than 1 micron are not detected, and the grain diameters are obviously better than the standards that the content of the emulsion grains with the size being 1 micron in emulsion large grains of national drug standards is not more than 3%; the physicochemical properties are stable, the toxic side effect is low, the pains caused by injection are reduced, and the compliance of using drugs by patients is increased, so that the application prospect is very good.

The invention discloses a method for preparing a lithium battery anode material precursor, which comprises the following steps of: adding a surfactant into a reaction cylinder; adding salt solution of nickel, salt solution of manganese or/and cobalt to carry out aging reaction with alkali solution; and dewatering and drying after the reaction is finished to obtain the lithium battery anode material precursor. The invention provides the method for preparing the lithium battery anode material precursor having regular topography, large specific surface area and high tap density.

The embodiment of the invention discloses a building waste treatment device for civil engineering in the technical field of civil engineering. The building waste treatment device comprises a first conveying mechanism, a height limiting adjusting mechanism, an air hammer knocking mechanism and a second conveying mechanism; the first conveying mechanism is transversely arranged, the height limitingadjusting mechanism is used for filtering waste particles on the first conveying mechanism, the air hammer knocking mechanism is used for conducting waste crushing on the conveying starting end of thefirst conveying mechanism, and the second conveying mechanism is obliquely arranged on one side of the bottom of the conveying tail end of the first conveying mechanism for shaking and conveying waste materials. According to the building waste treatment device for civil engineering, through the three procedures of waste knocking treatment, metal part separation treatment and crushing treatment, the waste particles with different particle sizes can be fully knocked and crushed, so that the metal parts and the waste particles are thoroughly separated, and the metal parts and the waste particlesare conveyed through shaking, an electromagnet is used for better completing the recovery work of the metal parts, and meanwhile, the particle size requirements of the waste particles with differentrequirements can be met by adjusting crushing treatment.

The invention relates to the fields of pulping and papermaking, and concretely relates to a process for removing stickies in a waste paper pulping process. According to the process, inorganic mineral matters such as cation modified talc powder, bentonite, attapulgite soil and calcium carbonate are added after heat dispersion and before secondary floatation in a waste paper pulping workshop section, cations of the inorganic mineral matters are used to adsorb the micro-fine stickies with negative charges, relatively large particle aggregate of the stickies is formed, a particle size requirement of floatation is achieved, the aggregate of the stickies is brought out from a liquid surface by utilizing floatation bubbles, the content of the stickeis in slurry is reduced, and the obstacle caused by the stickies in a papermaking workshop section is solved fundamentally.

The invention relates to the field of olefin polymerization catalysts and discloses a grading method for an olefin polymerization catalyst suspension liquid. Grading is conducted in a cyclone; the cyclone comprises a cyclone body and a collecting chamber; the cyclone body comprises a cylindrical pipe section and a conical pipe section from top to bottom; a first overflow pipe in airtight connection with the collecting chamber is arranged inside the cylindrical pipe section; and the cyclone body communicates with the collecting chamber through the first overflow pipe only. The method comprises steps as follows: the olefin polymerization catalyst suspension liquid is introduced into the cyclone body via a feeding port and rotates in the cyclone body; large particles are discharged via an outlet in the lower part of the conical pipe section; and small particles enter the collecting chamber through the first overflow pipe and are discharged via an outlet in the collecting chamber. The olefin polymerization catalyst suspension liquid is graded with the cyclone, the product particle sizes at the upper outlet and the lower outlet of the cyclone can be effectively controlled, and requirements of different olefin production technologies for the particle sizes of olefin polymerization catalyst particles can be met.

The invention discloses a dissociation agent for water wetting type oil sand slurrying. The dissociation agent is prepared from a penetrating agent, mineral oil, an asphalt emulsifier, a stripping agent, a PH value regulator and water, wherein the penetrating agent and the mineral oil constitute a mixture A, the penetrating agent accounts for 0.020%-0.025% of the mixture A in percentage by mass and is prepared from Oep-70 and Aep-98, and a mass ratio of Oep-70 to Aep-98 is (10:13)-(1:1); the asphalt emulsifier, the stripping agent, the PH value regulator and water constitute a mixture B, the asphalt emulsifier accounts for 0.2%-0.4% of the mixture B in percentage by mass, the asphalt emulsifier is prepared from Span-80 and Tween-80, a mass ratio of Span-80 to Tween-80 is (1:12)-(1:8), the stripping agent accounts for 0.005%-0.010% of the mixture B in percentage by mass, and the PH value regulator accounts for 0.3%-0.5% of the mixture B in percentage by mass. The dissociation agent is higher in physicochemical stability, and not only can meet the requirement of follow-up thermochemical washing for grain size of water wetting type oil sand grains, but also can improve the oil-sand separation effect.

The invention belongs to the technical field of constructional engineering, and particularly relates to a device for producing superfine sand from waste bricks and tiles. The device for producing superfine sand from waste bricks and tiles comprises a crushing box, a feeding belt, a crushing roller, a crushing motor, a first vibrating screen, a second vibrating screen, a coarse material guiding and conveying belt, a material returning belt, a scraper type lifting belt I and a grinding machine. The two-stage crushing structure is arranged to circularly crush waste bricks and tiles, the first-stage crushing adopts a double-roller mode to mainly crush large materials into small materials, and the second-stage crushing adopts a grinding mode to grind the small materials, so that the crushing efficiency is high, the crushed materials can basically meet the particle size requirement of superfine sand, and the crushing effect is good.

The invention provides a preparation method of isoniazid slow release microspheres. The method comprises the following steps: 1, uniformly mixing an isoniazid solid component (S) with an oil phase (O) and an organic solvent to form a solid-in-oil (S/O) suspension; and 2, carrying out spray drying on the suspension prepared in step 1 to prepare the slow release microspheres. The method adopting a solid-in-oil spray drying technology to prepare the isoniazid slow release microspheres overcomes the disadvantages of large particle size, burst release of drugs, low entrapment rate, complex preparation method and long preparation time of microspheres in the prior art. The method has the advantages of simple and controllable operation, suitable particle size, high entrapment rate, good slow release effect and no obvious burst release.