229 results about "Micropore Filter" patented technology

An intraocular drainage apparatus for treatment of glaucoma, a device to be used in the insertion of the drainage apparatus, and a method of controllably regulating intraocular pressure in glaucoma patients through the use of the drainage apparatus is described herein. The drainage apparatus is comprised of a tube capable of conducting fluid disposed between an inlet assembly, where aqueous humor enters the apparatus, and an outlet assembly, where aqueous humor exits the apparatus. The inlet assembly is comprised of a beveled tip and preferably an anchor. The beveled tip allows the drainage apparatus to be more easily inserted into an eyeball and the anchor, when employed, functions to hold the beveled tip of the inlet assembly within the anterior chamber of the eyeball. An opening in the beveled tip of the inlet assembly allows aqueous humor from the anterior chamber of the eyeball to flow through the inlet assembly, through the tube to ultimately drain through the outlet assembly, situated on the external surface of the eyeball, so as to be drained out of the eyeball onto the exterior surface of the eyeball. The inserting apparatus is comprised of an insertion prong attached to a first handle. The insertion prong has a sharp, beveled insertion point. The insertion prong also defines an aperture wherein a second prong is slideably received. The drainage apparatus is seated in the inserting apparatus and is positioned at a proper point in the eyeball. The inserting apparatus is then manipulated so that the second prong drives the drainage apparatus into the proper position within the eyeball. The drainage apparatus also provides for the use of micropore filters and / or valves to prevent infection and / or to predictably regulate the flow of aqueous humor from the anterior chamber of the eyeball to the surface of the eyeball, thereby allowing for post-surgical adjustment of the intraocular pressure within the eyeball. An apparatus for removing and replacing these filters and / or valves is also disclosed, as are alternative embodiments of the drainage apparatus and inserting apparatus.

The present invention provides tangential flow filtration devices and methods for enriching a heterogeneous mixture of blood constituents for leukocytes by removal of non-leukocyte blood constituents. In one particular embodiment the device can provide a composition enriched in monocytes. One embodiment includes a remover unit (1) having a crossflow chamber (3) separated by a microporous filter (5) from a filtrate chamber (4), the remover unit (1) also having a tangential flow inlet (6), a fluid outlet (7) for a fluid enriched in leukocytes and a filtrate outlet (8).

The invention relates to a multi-layer composite micropore filter separation material, a method for preparing the material and the application thereof, wherein, the preparation method comprises the following steps: (1) the fiber which can be fibrillated is prepared into fully fibrillated fiber material by pulping process; (2) the slurry is obtained after the fully fibrillated fiber material is dispersed in water; (3) advancing to the net and shaping are carried out, a layer of nonwoven fabric is placed on a shaping net, the above slurry is dehydrated on the nonwoven fabric directly for compound molding; (4) drying is carried out for obtaining the product. The product can also be processed by hot press molding. The method can be operated easily, is applicable for application of large scale, the obtained multi-layer composite high temperature resistance micropore filter separation material has the outstanding performance of high temperature resistance, meanwhile the uniformity of the holes is excellent, the average aperture can reach 10nm-1mum, and the method can be used in such fields as preparing filter material, battery septum material, electrolytic capacitor paper and double electric layers capacitor septum, etc.

The present invention provides tangential flow filtration devices and methods for enriching a heterogeneous mixture of blood constituents for leukocytes by removal of non-leukocyte blood constituents. In one particular embodiment the device can provide a composition enriched in monocytes. One embodiment includes a remover unit (1) having a crossflow chamber (3) separated by a microporous filter (5) from a filtrate chamber (4), the remover unit (1) also having a tangential flow inlet (6), a fluid outlet (7) for a fluid enriched in leukocytes and a filtrate outlet (8).

The invention discloses a method for preparing a vehicle urea solution. The method comprises the following steps: treating industrial desalted water by a reverse osmosis device, a microporous filter and an EDI electric deionizing device and then sterilizing to obtain high purity water, wherein the resistivity of the high purity water is equal to or greater than 16 Momega.cm at 25 DEG C; mixing the high purity water with a high temperature urea solution which is subjected to ammonia and CO2 removal by virtue of flash evaporation during production of urea to prepare a urea aqueous solution with the concentration of 48-55wt% and the temperature of 68-72 DEG C; then cooling to 18-25 DEG C, filtering to obtain crystallized urea, mixing the crystallized urea and the high purity water to prepare another urea aqueous solution with the concentration of 31.8-33.2wt%; finally filtering by a filter film with the aperture of 0.2-0.5 micron to obtain the final vehicle urea solution. According to the method, the vehicle urea solution is directly produced without an external heating source, the contents of biuret, metal ions, insoluble substances and the like are relatively low, the method is especially suitable for directly producing vehicle urea in a urea production factory, and the cost during production is reduced.

A battery cap is provided for engagement in a fill port of a cell of a deep cycle, lead-acid electrical storage battery. The battery cap is formed of a hollow, tubular body having an upper end with an expansive mouth opening, and a lower end at which a transverse floor extends radially inwardly. The floor includes a central, annular convex downwardly projecting portion that defines a central fluid passage opening. The interior of the tubular wall defines a radially inwardly projecting flame arrester seat spaced from both the upper and lower ends of the body. A pair of gas escape ports are defined in the tubular wall between the flame arrester seat and the mouth opening. A diverter is located in the lower portion of the tubular body beneath a disc shaped micropore filter that serves as the flame arrester and which is seated on the flame arrester seat. The diverter is formed with a generally disc shaped, horizontal plate having diametrically opposed notches at its peripheral edge and a pair of legs of that have an arcuate cross-section and which rest upon the floor to partially surround the central opening in the floor. A battery cap having this internal structure causes drops of electrolyte to intermittently lodge in the central floor opening, thereby forming a temporary fluid seal that is repeatedly broken to allow venting of gas and reestablished to aid in protecting the micropore filter from contaminants.

The invention discloses textile inkjet printing acid dye ink comprising the following components in percentage by weight: 0.5-10 percent of acid dye, 0.5-10 percent of viscosity modifier, 5.0-20 percent of humectant, 0.2-5 percent of osmotic agent, 0.1-2 percent of pH control agent, 0.1-1 percent of disinfectant and the balance of deionized water. The invention also discloses a production method of the textile inkjet printing acid dye ink, comprising the following steps of: (1) mixing the acid dye, the viscosity modifier, the humectant, the osmotic agent, the pH control agent, the disinfectant and the deionized water for 2 hours in the rotation speed of 100-300 revolutions per second at the temperature of 40-60 DEG C; and (2) cooling the mixture to normal temperature and sequentially filtering the mixture by micropore filters with pore diameters of 0.45 micrometer and 0.20 micrometer. The textile inkjet printing acid dye ink can be used for the inkjet printing of true silk, wool, chinlon, leather, and the like.

The invention relates to a self-supported and flexible poly(3,4-ethylenedioxythiophene) (PEDOT) nanofiber / single-walled carbon nanotubes (SWCNTs) composite thermoelectric material thin film and a preparation method thereof. The self-supported and flexible PEDOT nanofiber / SWCNTs composite thermoelectric material thin film is prepared according to the following steps of (1) dissolving an anionic surfactant in deionized water, adding an oxidizing agent, and performing stirring in oil bath to obtain a mixed solution A; (2) adding a PEDOT monomer into the mixed solution A, performing oil bath reaction, cooling, separation and cleaning to obtain a PEDOT nanofiber, and dispersing the PEDOT nanofiber in methanol for use; (3) performing ultrasonic dispersion on SWCNTs in the methanol, performing ultrasound after a PEDOT methanol solution is mixed to obtain a mixed solution B; and (4) pumping and filtering the mixed solution B onto a micropore filtering film by a vacuum pumping and filtering method, and performing drying to obtain the self-supported and flexible PEDOT nanofiber / SWCNTs composite thermoelectric material thin film. Compared with the prior art, the high conductivity of PEDOT and high Seeback coefficient of the SWCNTs are effectively combined, and the power factor under a room temperature reaches 14.4 micro volts / mK<2>; and moreover, the preparation method is simple and has the advantages of high yield, high repeatability and the like.

The present invention discloses a single-chamber microfiltration membrane self-mediator coupling type microbial fuel cell, comprises a single-chamber type cell body, an anode plate, a cathode plate and a top cover, wherein, the single-chamber type cell body is in a square cavity structure; the cathode plate consists of a micropore filter layer, a catalyst layer, a carbon paper base layer and a waterproof layer which are connected in order; the micropore filter layer is a hydrophilic microfiltration membrane with micropores; the catalyst layer is the mixture of platinum catalyst and carbon powder, which covers one side of the carbon paper base layer in contact with solution inside the cell body; the other side of the carbon paper base layer in contact with air is plastered with 2-3 polyfluortetraethylene thin coatings so as to form the waterproof layer. The device of the present invention can have a plurality of anode plates placed inside and flexibly adjust the relative distance between the anode plates and an anode. In the whole operation process, the system does not need to keep strict anaerobic environment. The cell is simple in structure, cheap in material, flexible to operate, fast to charge / discharge, stable in performance and capable of constantly and efficiently purifying sewage and producing electric energy which can be directly utilized.

A battery cap is provided for engagement in a fill port of a cell of a deep cycle, lead-acid electrical storage battery. The battery cap is formed of a hollow, tubular body having an upper end with an expansive mouth opening, and a lower end at which a transverse floor extends radially inwardly. The floor includes a central, annular convex downwardly projecting portion that defines a central fluid passage opening. The interior of the tubular wall defines a radially inwardly projecting flame arrester seat spaced from both the upper and lower ends of the body. A pair of gas escape ports are defined in the tubular wall between the flame arrester seat and the mouth opening. A diverter is located in the lower portion of the tubular body beneath a disc shaped micropore filter that serves as the flame arrester and which is seated on the flame arrester seat. The diverter is formed with a generally disc shaped, horizontal plate having diametrically opposed notches at its peripheral edge and a pair of legs of that have an arcuate cross-section and which rest upon the floor to partially surround the central opening in the floor. A battery cap having this internal structure causes drops of electrolyte to intermittently lodge in the central floor opening, thereby forming a temporary fluid seal that is repeatedly broken to allow venting of gas and re-established to aid in protecting the micropore filter from contaminants.

The invention relates to a preparation method of electronic grade tetraethoxysilane and particularly relates to a preparation method of electronic grade tetraethoxysilane for chemical vapor deposition in semiconductor industry. The preparation method comprises the steps of firstly complexing most of metal impurities in raw materials by using a complexing agent, and then filtering by using a microporous filter of 0.1 micron; passing through a cation exchange tower, a quartz plate type distillation tower and a sub-boiling distiller, strictly controlling temperature, and removing trace metal impurities, ethanol, other organic impurities and water. The preparation method provided by the invention adopts conventional purification equipment and has the advantages of convenience in operation, effect of being conductive to industrial large-scale production and low product cost.

The invention discloses a composite micropore filter material comprising a base cloth layer, an upper attachment layer attached to the upper side of the base cloth layer and a lower attaching layer attached to the lower side of the base cloth layer, wherein the base cloth layer is one of polyimide short yarn base cloth, aromatic polysulphone shot yarn base cloth and polytetrafluoroethylene filament base cloth; the upper attaching layer is a mixture of aromatic polysulphone staple fibers and polyimide staple fibers; the lower attaching layer is pure aromatic polysulphone staple fiber; and the upper attaching layer and the lower attaching layer are paved on two sides of the base cloth layer and formed by closely stabling, wherein the close stabling is compounded by a needling process with aspun-lacing process. The filtering material has the characteristics of high temperature and corrosion resistance, low production cost and high filter precision.

A method for extracting multiple active ingredients of blueberry fruits comprises the steps that dried and smashed blueberry peel residues are firstly subjected to enzyme hydrolysis, then microwave extraction and solid-liquid centrifugal separation are performed, refined filtration is performed by using micropore filter bags, and filtrates are combined; discoloring and impurity removal are conducted on the mixed filtrate by using an ultra-filtration membrane, membrane re-separation is performed, vacuum concentration, alcohol precipitation and drying are conducted on the trapped filtrate to obtain a blueberry polysaccharide extract; passing-column absorption is conducted on the ultra-filtrated dialyzate through macroporous resin, then ethyl alcohol is used for elution and desorption, a desorbed solution is separated and concentrated by using a nano-filtration membrane, and vacuum concentration and freeze drying are conducted on the trapped solution to obtain a blueberry anthocyanin and original anthocyanin combined extract; nano-filtration membrane dialysate is subjected to further separation and dehydration by using a reverse osmosis membrane, vacuum concentration and spray drying are conducted on the trapped solution to obtain a blueberry ellagic acid etract. By means of the method, multiple effective ingredients including polysaccharide, original anthocyanin, anthocyanin, ellagic acid and the like of blueberries can be obtained, the extracts are higher in purity, good in quality, and a production process is green and capable of saving energy and is environmentally friendly.

The present invention relates to nanosilver-loaded organic functional silica, a preparation method thereof and application thereof, and belongs to the field of silica materials. The first object of the present invention is to provide a method effectively loading nanosilver on organic functionalized silica, including: adding organic functionalized silica to deionized water, adjusting the pH value at 9-11, adding a monovalent state silver compound and a complexing agent, and stirring and mixing for 2-8h, wherein the adding amount of the organic functionalized silicon material is 1-500g / L, the adding amount of a monovalent state silver compound is 0.1-100g / L, and the adding amount of the complexing agent is 0.1-200g / L. The second object of the present invention is to provide nanosilver-loaded organic functionalized silica prepared by the above preparation method. The third object of the present invention is to provide the application of nanosilver-loaded organic functionalized silica in the purification of drinking water. The present invention can be filled into a microporous filter to be used as a water purifier.

The invention relates to a method for removing a boron element from silicon, which comprises the following steps of: (1) selecting high-quality silicon generally based on 2202-qualtiy silicon; (2) weighing a certain amount of silicon, and adding the silicon into a refining furnace for refining; (3) heating the refining furnace by electricity to fully melt the silicon; (4) weighing an alkali slag forming agent in a total weight ratio of the alkali slag forming agent to the silicon of 1:!-1:5; (5) dividing the weighed alkali slag forming agent into 10 equal parts, adding the alkali slag forming agent into the refining furnace by 10 times, filtering the surface slag liquid when smelting once every one hour, and repeatedly adding the agent into the refining furnace to smelt the filter slag for 10 times; and (6) preparing a directional pouring container with a micropore filter device, pouring the silicon liquid into the directional container through the micropore filter device to perform directional cooling, detecting the boron content of less than 0.4PPm, and preparing the low-boron high-purity silicon. The method has the advantages of simple process, simple and convenient operation, low energy consumption and no pollution discharge.

The invention relates to the field of biotechnology and especially relates to a preparation method of a grass carp scale collagen protein facial mask. The preparation method includes the steps of: 1) soaking grass carp scales in a solvent containing carbonates, and adding the grass carp scales to an acid solution, treating the grass carp scales under microwave, soaking the grass carp scales in an alkali solution, and filtering the solution to obtain a first filtrate and a first filter residue; 2) treating the first filter residue in an enzyme preparation, washing and filtering the mixture to obtain a second filtrate and a second filter residue; 3) mixing the first and the second filtrates, filtering the filtrates through a micropore filter membrane to obtain a third filtrate, and drying the third filtrate to prepare grass carp scale collagen protein; and 4) uniformly mixing the grass carp scale collagen protein with a film-forming agent, plant extracts, a thickening agent and a penetrant in a solvent to obtain the grass carp scale collagen protein facial mask. The method is high in extraction efficiency of the grass carp scale collagen protein. The extracted grass carp scale collagen protein is free of irritation substances, so that the facial mask has high safety.

The invention discloses a trace amount microorganism quick detection system which includes a scanning light path unit and a control unit. The scanning light path unit includes a laser device, a beam expanding lens, a first grating, a first light filter set, a second light filter set, a dichroic mirror, a two-dimensional scanning galvanometer, a scanning lens, a lens, a second grating and a photoelectric detector. The scanning light path unit is used for filtering incident laser, focusing light beam, moving a light spot, separating the incident laser and a fluorescent signal, and converting a photoelectric signal. The control unit includes a two-dimensional galvanometer control card, a data collection card and a terminal controller. The data collection card converts an analogue electric signal, which is outputted to the photoelectric detector, into a digital electric signal, and sends data to the terminal controller for processing the data, thereby finally displaying a two-dimensional image. The system is mainly used for detecting and counting fluorescently-dyed microorganisms attached to the surface of a micropore filter membrane and achieves the quick scanning detection on the microorganisms in trace amount.

The invention relates to a cleaning production process of preparing iminodiacetic acid with iminodiacetic acid sodium salts as raw materials. The invention is characterized in that iminodiacetic acid sodium salts are used as the raw materials and a membrane integration technique is used to prepare iminodiacetic acid. The particular process comprises the following steps: 1) iminodiacetic acid sodium salts are used as the raw materials, softened water or crystallized mother liquors of diacetate is added, and the weight percentage of the iminodiacetic acid sodium salts is diluted to 5%-30%; 2) the solution in the step 1 passes through a multi-medium filter containing activated carbons at a flow rate of 2-20 m / h for removing mechanical impurities and sticky substances and is filtered through one or more combination of a precision filter, a micropore filter and a ultrafiltration membrane for removing micron, sub-micron and macromolecular impurities; 3) the solution is introduced to an electrodialyzer for electrodialysis to control PH=1-5 at a salt chamber for obtaining the iminodiacetic acid solution and obtain a sodium hydroxide solution at a base chamber; 4) the temperature of the iminodiacetic acid solution obtained in the step 3) is reduced to the temperature of -5 to 20 DEG C or the temperature of 5 DEG C below zero to 20 DEG C following the regulation of PH=1.2 -3 to precipitate the IDA solid, and then the residual mother liquor is concentrated with a membrane to remove water and the concentrated liquid returns to crystallization.

The invention relates to a dexrazoxane freeze-dried powder injection and the preparation method. The preparation is used for resisting the cardiac toxicity which is induced by the cumulate quantity of adriamycin. The dexrazoxane freeze-dried powder injection contains the active components of the dexrazoxane and hydrochloric acid, the weight proportion of which is 1 to 0.05 to 0.5, and the preferential proportion is 1 to 0.2 to 0.5. The preparation method is that the hydrochloric acid is put into an aseptic vessel; the water for injecting is added till 80 percent of the preparation quantity, and the temperature is reduced and kept at 2 to 6 DEG C; the dexrazoxane is added to be mixed, and the hydrochloric acid of 1.0mol / L is dripped slowly into the solution to be solved while mixing the solution; the water for injecting is added till the full quantity; active carbon of 0.3 percent is added for absorbing for thirty minutes, and then the solution is decarbonized; after the medium body content is mensurated as being eligible, the solution is filtered by a 0.22 micron-micropore filtering filer; the filtrate is filled into a 25ml cillin bottle according to the filling quantity of 10ml each bottle, and the bottles are partially plugged by buna plugs and filled onto a plate to be sent into a freeze-drying box; a temperature probe is inserted, and the box door is closed; the filtrate is warmed, sublimed and dried be stages; nitrogen is puffed; the plugs are pressed; the filtrate is taken out from the box for rolling the openings, detecting the quality and packaging and the preparation can be obtained.

The invention relates to a method for separating and determining multiple phenolic substances in saliva, and belongs to the technical field of analytical chemistry. The method comprises the steps of collecting a saliva sample by adopting a saliva collection tube, carrying out high-speed centrifugation after collection and then taking a supernatant; carrying out acidification, adding an internal standard and carrying out vortex oscillation until mixing evenly in sequence; and filtering with a micropore filter membrane, separating and determining multiple phenolic substances in saliva from filtrate by adopting an ultra-high performance liquid chromatography-multiwavelength fluorescence method, fabricating a standard curve and quantifying through an internal standard method. The method can be effectively used for separating and determining the multiple phenolic substances in the saliva, and the method is good in separation effect, low in detection limit, good in precision, accurate and reliable, and has popularization and application values.

The invention discloses a graphene lyogel thin-film preparation method. The method includes the steps that firstly, graphene micro-sheet colloid dispersion liquid is subjected to suction and filtration through a micropore filtering membrane, and then a graphene gel thin-film is obtained; secondly, a mixed solution of volatile liquid and non-volatile liquid is made to enter an internal three-dimensional hole network of the gel thin-film under the capillary action, the volatile liquid in the gel thin-film is removed through a vacuum drying method, and the non-volatile liquid is reserved in the gel thin-film. Since the gel thin-film contains the non-volatile liquid, the problems that graphene becomes graphite again due to lamination and then the conductivity of the graphene and the overall specific surface area of the gel thin-film are reduced due to collapse of internal holes of the gel thin-film in the preparation process of the graphene gel thin-film in the past are effectively solved; the thickness of the graphene lyogel thin-film is greatly reduced, so that the energy density is greatly increased when the graphene lyogel thin-film is used as electrodes of supercapacitors.

The invention relates to a method for preparing a forming filter medium, in particular to a method for preparing a modified ultra-high molecular weight polyethylene micro porous filter element. The invention solves the problems of incomplete filtration in the prior art of micro porous membrane. The modified ultra-high molecular weight polyethylene micro porous filter element is prepared by mixing and sintering modified zeolite, active carbon and ultra-high molecular weight polyethylene. The invention has the novelty that the micro porous filtration membrane is modified by means of mixing the active carbon and the modified zeolite into the ultra-high molecular weight polyethylene. Therefore, the physical structure of the filtration membrane can be changed, and the filtration membrane is granted wide chemical absorption function.

The invention discloses a manufacturing method of a nucleopore filtration film to optimize flow passages in the technology field of liquid filtration. The manufacturing method is that a heavy ion accelerator or a reactor is used to radiate an insulation film and radiation damage is formed inside the insulation material; a solvent type release layer is coated on the insulation film; an alkalifast adhesive film is compounded on the surface of the release layer at low temperature to form a composite film; subsequently, under the optimized etching condition, the composite film is etched on one side under the protection of the adhesive film, thus forming non-biconical micropores; the release layer is stripped off at ordinary temperature; the microporous film is washed in de-ionized water before the composite film is dried. The microporous film made by using the method can have the thickness more than 10 micrometers, the opening rate on the upper surface of the film less than 1 percent and the porosity on the lower surface more than 10 percent. When the microporous film is used for liquid filtration, the flow resistance is small, the flow is large, granules are unlikely to be absorbed and cause dead end filtration. The method provided by the invention is applicable for producing films in batch; the process is well-developed; product quality is controlled easily and the cost is low.

The invention relates to a multichannel membrane enrichment device comprising a multichannel input unit, an enrichment filter membrane and a filter liquor collection container, wherein the multichannel input unit is a wafer with holes and at least one smooth face and in butt joint with the enrichment filter membrane by the smooth face; connection pipelines are arranged on the holes in the other face of the multichannel input unit for inputting a sample solution; the filter liquor collection container is arranged below the enrichment filter membrane; the filter liquor collection container comprises a micropore filter core and a filter liquor container; the lower end of the micropore filter core is connected with the opening end of the filter liquor container by a rubber plug; the filter liquor container is provided with a vacuum pump connection hole. By utilizing the multichannel membrane enrichment device, a plurality of samples can be treated on the same filter membrane simultaneously or according to a certain order to improve repeatability of enrichment process. Filter hole diameter can be changed according to needs, and the enrichment efficiency is high under the condition that the samples are the same in size. By utilizing the multichannel membrane enrichment device, multichannel simultaneous enrichment can be realized, enrichment process can be accelerated, batch operation is easy to realize, different number of channels can be selectively used, and the number of the samples is easy to control.

A micropore filter material sintered plate for a dust separator. The sintered plate solves the problems that the existing dust separator can not process fine dust of multiphase fluid and dust accumulated and attached to an outside surface of a sintered plate is difficult to be shed. The sintered plate comprises a sintered plate body, a division plate and a bottom framework. The sintered plate is characterized in that: the sintered plate body is composed of two pieces of V-shaped corrugated plates which are symmetrical; bonding surfaces of the V-shaped corrugated plates are glued to form corrugated inner cavities separated from each other; outside surfaces of the glued V-shaped corrugated plates are coated with teflon coatings and are inserted in an upper and a lower connecting seats; the upper connecting seat is encapsulated above the division plate; and the lower connecting seat is fixed on the bottom framework. Compared with similar products, the sintered plate has the advantages ofreasonable design, compact structure, easy manufacture, easy operations of loading and unloading, small volume, great improvement of dust gathering efficiency, long service life, convenient maintenance, and unique functions of filtering dust which can absorbs moisture and has a high water content, and dust which contains oil and fiber.

The invention relates to a dust cup device for a dust collector, which comprises a cup body provided with a tangential total air inlet, and a separator arranged in the cup body. The dust cup device is characterized in that the separator comprises a cylindrical micropore filter which is arranged between the cup bottom and a cup cover through an end sleeve at the upper end and an end sleeve at the lower end, the transition part between the micropore filter and the end sleeve at the lower end is extended with a dust blocking cover tilting outwards, and a deposition cavity for large granule dust is formed between the dust blocking cover and the cup body. The dust cup device is further provided with a cyclone with a tangential air inlet, the lower part of the cyclone is provided with a dust blocking sheet, and the lower end of the cyclone is directly or indirectly fixed in the end sleeve at the lower end to form a deposition cavity for small granule dust; and the center of the cup cover is provided with a total air outlet and an air outlet pipe, and the air outlet pipe is matched with the air inlet on the cyclone. The dust cup device adopts various separation structures and multi-stage separation, has good separation effect, is easy to separate the large and small granule dust, is not easy for entrainment, has few components, and is easy to assemble and use.

The present invention relates to a nimodipine lipid nano granular composition and its preparation method. It can be made into injection, its composition includes 0.002-0.2% of nimodipine, 0.02-10% ofphospholipid and 0-2% of Poloxamer. Its preparation method includes the following steps: dissolving the above-mentioned materials in ethyl alcohol, adding injection water, making hydration for 1-2 hr. to obtain nimodipine lipid granular solution, high-pressure homogenizing for 10 min. under the condition of nitrogen gas flow, filtering with 0.2 micrometer micropore filtering membrane, adding injection water, filling, sealing, sterilizing so as to obtain the invented product.

The invention discloses an anti-refluxing sealing test tube cap. The anti-refluxing sealing test tube cap comprises a top cap and a cylindrical cap body, wherein the cap body is matched with a test tube opening in size and shape, a through hole is formed in the top cap, a micropore filtering membrane ring and a check valve ring are sequentially arranged at the lower end of the top cap, a downward duckbill valve hole is formed in the middle position of the check valve ring, the lower end of the duckbill valve hole is closed up towards the middle to form a flat opening, and vent holes are formed in the corresponding positions of the top cap and the check valve ring respectively. According to the test tube cap, due to the improved reasonable structure, and particularly due to a sealing structure formed by a duckbill mechanism and the micropore filtering membrane ring, the good sealing property is ensured, substances can be added into a test tube conveniently, and the air pressures inside and outside the test tube can be kept to be balanced, so that leakage or refluxing of substances or bacteria, caused by pressure difference, can be avoided, and the anti-refluxing sealing test tube cap has good using value in the aspect of biological security application.

The invention discloses lincomycin hydrochloride freeze-dried powder injection for livestock injection and a preparation method thereof and belongs to the technical field of veterinary medicines. The lincomycin hydrochloride freeze-dried powder injection comprises the following components: 3 to 30 percent of lincomycin hydrochloride, 0.1 to 90 percent of excipient and 0.1 to 90 percent of additive. The preparation method comprises: adding lincomycin hydrochloride and prescription amount of excipient in water for injection in a sterile environment under a dark condition and fully stirring for dissolution; adding the additive to regulate the pH value to between 4.0 and 6.5; performing ultrafiltration, adding medicinal active carbon, stirring, absorbing and removing a heat source; filtering by 0.45-micrometer micropore filtering film, and fixing volume; filtering by a 0.22-micrometer micropore filter film terminal for sterilization; and charging with nitrogen, filling separately, freeze drying, capping, sealing and storing. The product of the invention is based on a simple formula, has safe quality and high stability, can be prepared by a simple process at low cost and is easy to store and transport.

The invention provides an anti-pollution aging method for putting black tea into a packaging container with a ventilated extraction valve having sealing and filter films and specially designed packaging container for implementing the method, wherein the method comprises the following steps of: a) putting the black tea into the packaging container with the ventilated extraction valve, and keeping the black tea in a sealing state; b) screwing on a first regulation protecting cover of aventilated valve, wherein the ventilated extraction valve comprises a ventilated valve and an extraction valve; c) screwing off a sealing cover of the extraction valve, pumping by a vacuum pump so that the vacuum degree in the packaging container is smaller than or equal to 150-250 Pa, reducing air, dust particles and microorganism carried by the air in the container to least, and screwing on the sealing cover of the extraction valve so as to keep the extraction valve in the sealing state; and d) loosening the first regulation protecting cover of the ventilated valve reversely by screwing, causing the air to pass through a micropore filter film to enter in and out the bag, preventing the particles and microorganism outside from entering into the packaging container, naturally oxidizing the tea to finish the anti-pollution aging so that the tea is more fragrant when the time is longer. The invention also provides the packaging container for implementing the method.