250 results about "Methods preparation" patented technology

The present invention provides food bars for consumption by pregnant women, lactating women or women of childbearing potential that are attempting to become pregnant containing one or more vitamins and / or minerals, and one or more anti-constipation and regularity-maintaining agents, methods for preparing these food bars, and methods for supplementing the dietary requirements of pregnant women, lactating women or women of childbearing potential that are attempting to become pregnant. The food bars of the invention generally comprise one or more vitamins and minerals recommended for consumption by pregnant women, lactating women or women of childbearing potential that are attempting to become pregnant in an amount that is effective for enhancing the nutrition of pregnant women, lactating women or women of childbearing potential that are attempting to become pregnant, and that is not harmful to developing fetuses or breast-feeding babies, one or more anti-constipation and regularity maintaining agents in an amount that is effective for reducing or eliminating constipation, and that is not harmful to developing fetuses or breast-feeding babies, from about 0 to about 99 weight percent of carbohydrates, from about 0 to about 80 weight percent of proteins, and from about 0 to about 60 weight percent of fats.

The present invention provides food bars for consumption by pregnant women, lactating women or women of childbearing potential that are attempting to become pregnant containing one or more vitamins and / or minerals, and one or more anti-constipation and regularity-maintaining agents, methods for preparing these food bars, and methods for supplementing the dietary requirements of pregnant women, lactating women or women of childbearing potential that are attempting to become pregnant. The food bars of the invention generally comprise one or more vitamins and minerals recommended for consumption by pregnant women, lactating women or women of childbearing potential that are attempting to become pregnant in an amount that is effective for enhancing the nutrition of pregnant women, lactating women or women of childbearing potential that are attempting to become pregnant, and that is not harmful to developing fetuses or breast-feeding babies, one or more anti-constipation and regularity-maintaining agents in an amount that is effective for reducing or eliminating constipation, and that is not harmful to developing fetuses or breast-feeding babies, from about 0 to about 99 weight percent of carbohydrates, from about 0 to about 80 weight percent of proteins, and from about 0 to about 60 weight percent of fats.

The invention discloses a dorking composite Chinese medicinal herb feed additive capable of promoting the growth of dorkings and improving chicken quality, a preparation method thereof and use thereof. The additive comprises the medicinal components of raidx astragali, oriental waterplantain rhizome, indian buead, hawthorn, malt, codonopsis pilosula, officinal magnolia bark, medicated leaven, tangerine peel, liquoric root and the like. The raw materials are normally dried and crushed, sieved and uniformly mixed to form the green feed additive; 0.5 to 2 weight percent of the prepared additive is added into the basic daily ration of 3 to 6 years old dorkings; the additive and the basic daily ration are mixed uniformly and fed to the dorkings in a way that the dorkings takes food and water freely. Tests show that the method preparation method can improve the growth properties of the dorkings, reduce abdominal fat rate, increase the crude protein and fat content of the chicken and improve chicken quality. The dorking composite Chinese medicinal herb feed additive overcomes the drawbacks of various chemical medicament and antibiotic feed additives, avoids toxic and side effects and medicament residue, and guarantees the production of green and high quality chicken products.

The invention provides a wet-method preparation process of a ternary positive material for a lithium ion battery. The synthesis process of a ternary precursor comprises the steps of: adding complexing agent ammonia water, an aqueous solution of metal nickel-cobalt-manganese ions, and a precipitating agent aqueous solution of sodium hydroxide into a reaction kettle to prepare the liquid-phase ternary precursor under the condition of protection gas; and the synthesis process of the ternary material comprises the steps of: carrying out preliminary-stage sintering in a muffle furnace after ball grinding, mixing, smashing and fast drying the ternary precursor and lithium salt, secondarily introducing of the lithium salt into the materials according to a proportion after the preliminary-stage sintering, and carrying out secondary sintering in the muffle furnace after mixing the materials, so as to obtain the nickel-cobalt-manganese acid lithium ternary positive material. The method provided by the invention is simple in preparation process, the particle size of the prepared nickel-cobalt-manganese acid lithium ternary positive material ranges from 0.5 to 10 microns, the prepared nickel-cobalt-manganese acid lithium ternary positive material is controllable and can be uniformly distributed, and the nickel-cobalt-manganese acid lithium ternary positive material has an excellent electrochemical performance.

The invention discloses an epoxy self-leveling floor coating and a preparation method thereof. The epoxy self-leveling floor coating comprises a component A and a component B, wherein the mass ratio of the component A to the component B is (4:1)-(6:1); the component A is prepared from the following raw materials by weight percent: 35.0-38.0 parts of liquid epoxy resin, 5.0-10.0 parts of an epoxy active diluent, 0.3-0.5 part of a dispersing agent, 0.3-0.5 part of a defoaming agent, 1.0-2.0 parts of pigment, 10.0-15.0 parts of talcum powder, 15.0-20.0 parts of quartz powder, 20.0-25.0 parts of barium sulfate, 0.3-0.5 part of a flatting agent and 2.0-3.0 part of benzyl alcohol; the component B is a curing agent. The epoxy self-leveling floor coating is low in VOC (Volatile Organic Compound) and high in flowbility, can meet the environment-friendly theory, and is harmless to human bodies; a prepared paint film is smooth, bright and attractive in surface, the brightness is greater than 95%, and the effect of mirror surface is achieved; the paint film is low in viscosity, good in flowbility even at a low temperature, and high in drying speed; a high stirring method preparation process is adopted, so that the waste of raw materials is reduced, and the energy consumption is reduced.

The invention discloses a method for hydrothermal method preparation of a graphene-loaded flower-type titanium dioxide composite material and belongs to the technical field of composite materials. The method utilizes graphite oxide and a titanium salt as precursors, a low carbon alcohol-water mixed solvent as a medium and a surfactant as a soft template and comprises carrying out functionalization modification on the graphite oxide, adding an acid solution of the titanium salt into the modified graphite oxide, carrying out stirring so that the titanium ions are combined to the functionalized graphite oxide, adding the functionalized graphite oxide into a reactor, and carrying out a hydro-thermal reaction process so that the graphene-loaded flower-type titanium dioxide composite material is prepared by one step. The graphene-loaded flower-type titanium dioxide composite material comprises a rutile phase titanium dioxide nanometer rod-assembled flower-type structure with nanometer rod diameters of 15-35nm on the graphene surface, and through graphene connection, the structure has high specific surface area and can promote electron transmission on the material. Therefore, the graphene-loaded flower-type titanium dioxide composite material has good application prospects in the fields of photocatalysis, solar cells and gas-sensitive sensors.

The invention relates to a Claus tail-gas hydrogenation catalyst and a preparation method thereof. The Claus tail-gas hydrogenation catalyst is mainly characterized in that a carrier of the catalyst is made of silicon modified titanium and aluminum composite dry glue, a cementing agent, a chambering agent and an auxiliary agent, wherein the auxiliary agent is one or more of zinc oxide, iron oxide, magnesium oxide or salts thereof; and an active component is a ternary active component consisting of molybdenum or tungsten and cobalt as well as nickel. The Claus tail-gas hydrogenation catalyst is prepared by adopting an immersion method preparation process. The catalyst has the characteristics of no pollution in the preparation process, low temperature SO2 hydrogenation activity, hydrogenolysis activity of organic sulfurs of CS2, COS and the like and good hydrolysis activity, can be used in a Claus tail gas hydrogenation process, and has remarkable energy-saving and consumption-reducing effects because the use temperature of the Claus tail-gas hydrogenation catalyst is lower than over 60 DEG C as comparison with the common Claus tail-gas hydrogenation catalyst.

The invention discloses an integrated stack double-junction perovskite solar cell and a preparation method thereof. The integrated stack double-junction perovskite solar cell is characterized in that the integrated stack double-junction perovskite solar cell comprises FTO transparent conductive glass, a high temperature sintering compact titanium dioxide layer, a wide band-gap perovskite light absorption layer, a silver nanowire transparent conductive ink intermediate electrode, a low temperature sintering compact titanium dioxide layer, a narrow band-gap perovskite light absorption layer, a hole transmission layer and a carbon electrode which are arranged from the bottom to the top in turn. Two perovskite light absorption layers with different band gaps are adopted so that range of light absorption spectrum of the cell is widened, an all-solution method preparation technology, which has advantages of ultralow energy consumption, simple technology equipment, low cost and short preparation period, is adopted, and thus photoelectric conversion efficiency of the perovskite solar cell can be greatly enhanced.

The present invention provides food bars for consumption by pregnant women, lactating women or women of childbearing potential that are attempting to become pregnant containing one or more vitamins and / or minerals, and one or more anti-constipation and regularity-maintaining agents, methods for preparing these food bars, and methods for supplementing the dietary requirements of pregnant women, lactating women or women of childbearing potential that are attempting to become pregnant. The food bars of the invention generally comprise one or more vitamins and minerals recommended for consumption by pregnant women, lactating women or women of childbearing potential that are attempting to become pregnant in an amount that is effective for enhancing the nutrition of pregnant women, lactating women or women of childbearing potential that are attempting to become pregnant, and that is not harmful to developing fetuses or breast-feeding babies, one or more anti-constipation and regularity-maintaining agents in an amount that is effective for reducing or eliminating constipation, and that is not harmful to developing fetuses or breast-feeding babies, from about 0 to about 99 weight percent of carbohydrates, from about 0 to about 80 weight percent of proteins, and from about 0 to about 60 weight percent of fats.

The invention provides formula powder for phenylketonuria children and a preparation method thereof. The formula powder comprises solid glucose syrup, amino acid, fatty acid, nucleotide, fish oil, dietary fiber, composite vitamins, composite mineral substances and an emulsifier, and is prepared by using a wet-method preparation process of materials. According to the formula powder, special free amino acid is adopted, a proper amount of free L-tyrosine is screened and optimized, and phenylalanine is removed, so that the physiological needs of sick children are met, and at the same time hypersensitivity of phenylketonuria infants is effectively prevented; in the formula, the components have the mutual synergistic effect, the powder is approximate to breast milk in absorption, taste and the like, children can absorb sufficient nutrition after taking the powder, and meanwhile anaphylaxis such as diarrhea can be effectively reduced; and the formula powder is simple in preparation method and applicable to requirements of large-scale industrial production.

The solution method for preparing metal photonic crystal belongs to the technical field of nano photoelectron materials and devices thereof. The existing method for preparing metal photonic crystal is faced with the problems such as high cost, low efficiency and small area of preparation, etc. In the invention, sequentially, optical resist is rotatably coated on a substrate; the interference photolithography is adopted to prepare one-dimensional or two-dimensional nano optical grating structures; metal nano particle sol is rotatably coated and goes through low temperature heat treatment, thus obtaining the metal photonic crystal. The invention has the advantages of low cost, high efficiency and preparation of the metal photonic crystal in a large acreage and the like.

The invention belongs to the technical field of preparation of graphene quantum dots, and relates to a method for preparing graphene quantum dots with adjustable oxygen content. The method comprises the steps that a brown graphene quantum dot water solution containing impurities is prepared through an electrochemistrical cyclic voltammetry method and then dialyzed, and a transparent flavescent graphene quantum dot water solution is obtained; the graphene quantum dots with different oxygen contents are prepared by regulating the oxidoreduction degree of an electrolyte in the electrochemistrical method preparation process. According to the method, the oxygen contents of the graphene quantum dots are effectively regulated, and the speed of preparing the graphene quantum dots through the electrochemistrical cyclic voltammetry method is increased. Meanwhile, the method is simple in preparation procedure, and has the advantages of being environmentally friendly and low in production cost and facilitating industrialization.

A method prepares an ankle joint of a patient for replacement. The patient includes a tibia (20) having a medial portion (22), a talus (40), and an ankle (10) having a medial portion. The method employs a cutting alignment apparatus (50) including a first portion external to the patient and a second portion, and surgically prepares and exposes the medial portion of the ankle for replacement. The second portion of the cutting alignment apparatus is coupled to the tibia, and a cutting guide (90) is disposed with respect to the cutting alignment apparatus. The medial portion of the tibia is detached, a portion of the tibia proximate the talus is cut, and a portion of the talus proximate the tibia is cut. An ankle prosthesis (100) is installed to the ankle, and the medial portion of the tibia is reattached.

The present invention relates generally to the field of CT and X-ray scanning units. More specifically, the invention relates to scanning unit with the capability to scan impressions and patients at the same location. Even more specifically, the invention involves a method of using data and images received from the same scanning unit to fabricate a surgical stint or guide device that snap fits onto a preparation site, and further allows a dental practitioner or a lab to prepare permanent prosthetics using the data and images from the same scanning unit. Even more specifically, the invention relates to a method of allowing the clinician to place high-fidelity teeth back into the correct location within the jaw taus and create models and treatment plans using hi-fidelity 3D images. Additionally, the invention relates to attaching an imaging capturing device (such as a digital camera) that allows the transmission of digital images or data from the capturing device to reconstructing software that reconstructs the 3D volume of the head topography to superimpose over the CT scan of head. The reconstructing software may reconstruct data from the captured digital images or data, from the data received from scanning patients and from scanning impressions. Thus, in an industry that previously required three different machines to scan impressions, the interior of the head and the topography of the head. SLD printers can print out a wax model utilizing crowns and bridges that is accurate and ultimately replaces lab technicians.

The invention relates to a mild preparation method of fluorinated graphene. The method adopts cheap and easily available graphene oxide and a liquid or solid fluorinating reagent as raw materials, and by changing the reaction solvent, time, pressure and other conditions, fluorinated graphene with an adjustable fluorine content can be obtained at room temperature. According to the invention, the filtration washing means is also utilized to remove the excess reaction reagents, solvents and other impurities during solution method preparation, thus obtaining a pure fluorinated graphene product.

The invention relates to a preparation method of spherical (CuS) particles. The preparation method comprises the steps that: copper nitric acid trihydrate is added into a mixed solvent consisting of de-ionized water and ethylene glycol to obtain solution A; thiourea is added into the solution A to obtain solution B; polyvinylpyrrolidone K30 is added into the solution B to form precursor solution C; the precursor solution C is poured into a microwave hydrothermal reaction kettle, then, the reaction kettle is sealed and is put into a temperature and pressure dual-control microwave hydrothermal reaction instrument, a temperature control mode or a pressure control mode is selected for reaction, and the solution is naturally cooled to the room temperature after reaction completion; and the hydrothermal reaction kettle is opened, products are respectively washed by the de-ionized water and absolute ethyl alcohol after centrifugal collection, and final products of spherical CuS particles are obtained after drying. The method has the advantages that a simple microwave hydrothermal method preparation process is adopted, the reaction period is short, the energy consumption is low, the reaction is completed in one step in liquid phases, and the later-period treatment is not needed. The prepared CuS particles have regular sphere shapes and uniform size.

The invention relates to a high strength and high toughness epoxy resin composition applicable for hot melt method preparation of a carbon fiber reinforced composite prepreg. The high strength and high toughness epoxy resin composition comprises epoxy resin with multiple degrees of functionality and high epoxy value, bisphenol A polyether epoxy resin with low viscosity, high performance thermoplastic resin and a solid curing agent. The high strength and high toughness epoxy resin composition provided by the invention has the advanategs of flexible formula, simple preparation process and adjustable viscosity, is especially suitable for hot melt preparation of prepreg; and the cured material has the characteristics of high strength and high toughness, and can used for preparation of composite materials with high mechanical properties.

Two-dimensional tungsten disulfide is a novel graphene-like two-dimensional material and has the great application potential on the aspects of electrical devices, energy, biotechnology and composites. A preparation method for the two-dimensional tungsten disulfide comprises a mechanical stripping method, an electrochemical lithium ion intercalation method, a liquid phase stripping method, a hydrothermal method, a chemical vapor deposition method and the like. The chemical vapor deposition method has the advantages of the controllable size, the controllable layer number, high material crystallization quality and the like when used for preparation of the two-dimensional tungsten disulfide. The study on CVD method preparation of the tungsten disulfide is less, the size of prepared two-dimensional tungsten disulfide in existing reports is only dozens of micrometers to a hundred micrometers, and the purpose of the controllable growth cannot be achieved. According to the controllable preparation method, by means of the chemical vapor deposition method, the growth process is improved, the vacuum low-pressure condition is not needed any more in the growth process, the growth can be conducted under the normal pressure, the high-quality two-dimensional tungsten disulfide can be grown through a simple single-temperature-zone pipe type furnace, the experiment process is simpler, the experiment cost is lowered greatly, and the experiment preparation controllability is improved.

The invention belongs to the field of agricultural machinery, and is applicable to biomass carbonization, in particular relates to a movable carbonization furnace for nearby carbonization and field returning of stalks and a carbon preparation method thereof. The invention can realize nearby treatment and field returning of stalks and reduce the large amount of freight of straw and biological carbon, does not require external energy, has low operation cost, and can continuously produce and save labor and time; multiple parallel pumping horn boxes (5) are used to realize uniform gas distribution and carbonization, short carbonization time, high receiving rate and good quality of carbon; exhaust is subjected to washing to recover useful wood-vinegar, so as to avoid the pollution to the environment. The invention can reach a three-win effect in the perspectives of carbon sequestration emission reduction, improvement of soil fertility to increase yield and increase of the income of farmers.

Preparation of barley grass powder and domestic fungus powder compounded chewing tablet, and a medium short wave infrared drying method, and belongs to the field of the research and development of health-care foods. The chewing tablet is prepared by using the barley grass powder and the domestic fungus fine powder as main raw materials and recombining with other food filling agents. The chewing tablet is prepared by the steps of smashing barley grass crude powder with a PM100 planetary mill; screening the smashed barley grass crude powder with a 200-mesh screen; and mixing the barley grass micro powder and the domestic fungus fine powder with the other food filling agents according to a certain proportion, adopting wet granulation, demoulding and medium short wave infrared drying. The moisture in a final product of the chewing tablet is not higher than 7%. The chewing tablet has the functions of nutrition and health; influences on heat sensitive components during the smashing process can be reduced by employing the PM100 planetary mill, because PM100 planetary mill has large diameter of a sun wheel, high speed ratio and high efficiency; drying time is shortened; work efficiency is increased; and energy is saved by using the medium short wave infrared drying. The obtained product has stronger frangrance, relatively good conservation for flavor components, relatively low product hardness and relatively good chewiness, and is helpful for the manufacture of the product.

The invention relates to polyurethane foam for wet-method preparation and a preparation method thereof, and belongs to the field of polyurethane foam production. The polyurethane foam is used for wet-method preparation of an automobile skylight sun shield or an automobile top. The polyurethane foam comprises a material A composed of polyether polyol, glycerin, silicone oil, water, a catalyst 1, a reaction catalyst 2, a low-volatility catalyst, an opening agent, and an anti-oxidant, and also comprises a material B composed of a mixture of pure MDI or polymerized MDI and MDI. The material A and the material B are mixed according to the above ratio and then are foamed to form the polyurethane foam for wet-method preparation of an automobile skylight sun shield or an automobile top. The preparation method is mainly used for a foaming continuous-production line. The preparation method is suitable for large-scale multi-size production. The more yield is, the higher foaming rate is. The preparation method has the advantages that in the industry, it is recognized that continuous foaming and box type foaming have the advantages of high foaming quality, accurate raw material metering, and uniform foam apertures; difference of upper, middle and lower parts of the foam block is reduced; unavailable upper and lower parts of the foam block can be controlled; and through multiple top flattening technologies, a foam yield is improved.

The invention relates to a preparation method of annular self assembled copper sulfide hollow spheres. The method comprises the steps that: soluble copper salt is added into de-ionized water to obtain solution A; polyvinylpyrrolidone K30 is added into the solution A to form precursor solution B; thiourea or sodium thiosulfate is added into solution B to obtain solution C; the solution C is poured into a microwave hydrothermal reaction kettle, then, the reaction kettle is sealed and is put into a temperature and pressure dual-control microwave hydrothermal reaction instrument, a temperature control mode or a pressure control mode is selected for reaction, and the solution is naturally cooled to the room temperature after reaction completion; and the hydrothermal reaction kettle is opened, products are respectively washed by the de-ionized water and absolute ethyl alcohol after centrifugal collection, and final products of annular self assembled copper sulfide hollow spheres are obtained after drying. The method has the advantages that a simple microwave hydrothermal method preparation process is adopted, the reaction period is short, the energy consumption is low, the reaction is completed in one step in liquid phases, and the later-period treatment is not needed.

The invention discloses a medium temperature solid oxide fuel cell anode-electrolyte-cathode components and its method preparation, which is made from the anode that is made of NiO and GYDC made, cathode that is made of LSFC and GYDC, and electrolyte that is made of GYDC. GYDC is the composite oxide of cerium, gadolinium and yttrium according to the chemical ratio of Ce1-xGdx -yYyO2-0.5x and 0.1<=x<=0.2, 0 H01M 8 / 02 H01M 4 / 86 H01M 4 / 88 H01M 8 / 10 2 15 1 2006 / 12 / 22 101000965 2007 / 7 / 18 100449834 2009 / 1 / 7 2009 / 1 / 7 2009 / 1 / 7 Tsinghua Univ. Beijing 100084 Zhou Heping Guang Xiangfeng Liu Zhihui Wang Yanan Zhang Jun guanchang renfeng hua 11245

The invention provides a fiber reinforced composite dot matrix core board mold and a wet method preparation process and relates to a mold and a wet process preparation process; the invention solves the problems that at present, no mold can manufacture the fiber reinforced composite dot matrix core board specially and no wet method preparation process can prepare the fiber reinforced composite dot matrix core board by utilizing the mold; a plurality of mold monomers are tiled at interval in an upright-inverting way to form a panel shape, and a plurality of the mold monomers are arranged between the two fixing bars; the preparation process comprises the following steps: step I: mold processing; step II: mold fixation; step III: fiber column rolling; step IV: fiber spreading and pre-impregnating; step V: pressurizing and curing; step VI: demolding. The fiber reinforced composite dot matrix core board mold has simple structure, low cost and convenient operation; the fiber reinforced composite dot matrix core board prepared by the wet method preparation process has higher specific strength and specific stiffness compared with the traditional metal dot matrix core board.

A Fischer-Tropsch synthesis iron / manganese catalyst whose atomic ratio is composed of: Fe: Mn: IIA main group metal elements: K = 100: 4-100: 1-50: 0.5-10, and the precursor of the catalyst composition is carried out by precipitation method Prepare the catalyst. The present invention has chemical agent activity higher, low carbon olefin (C 2-4 ＝ ) and C 5 + Good selectivity, low methane selectivity, suitable for coal-based synthesis gas with low hydrogen-carbon ratio and natural gas-based synthesis gas with high hydrogen-carbon ratio.

The invention aims to solve the problems in the prior art, such as low degree of utilization of konjac resources and lack of clean and high-efficiency full-biomass utilization method, and provides a comprehensive utilization method for konjac. Based on steam explosion classification in combination with glucomannan wet-method preparation techniques and in consideration of physicochemical properties of individual components, the method achieves co-production eco-industrial development and comprises the following steps: extracting alkaloids from konjac skin, making konjac tuber powder by wet grinding, extracting ceramide from konjac fly powder, and producing biogas and ethanol by fermentation of a grinding waste liquid. The method can not only increase the utilization ratio of konjac resources and reduce environmental pollution but also achieve full-biomass utilization of konjac. The method is advantageous in having low energy consumption and high efficiency, increasing purity of the refined powder and achieving full-biomass clean high-value utilization of konjac.

The invention discloses a low-efficiency and low-consumption water seal lithium ion battery film extraction process and belongs to the field of battery film wet-method preparation extraction. According to the process, a battery film is extracted in extraction equipment filled with an extraction agent; the extraction equipment comprises an extraction tank which is filled with the extraction agent and is sealed, a guide roller which is arranged inside the extraction tank and is used for conveying the film, and extraction agent heating devices; the film is submerged into the extraction agent; a water seal layer is further arranged on the upper layer of the extraction agent; a group of partition plates which are arranged high and low in a staggered manner are arranged inside the extraction tank; the partition plates inside the extraction tank form a snake-shaped extraction agent flowing channel; the heating devices are arranged on the partition plates; multi-stage counter flow extraction is implemented; the flowing direction of the extraction agent is opposite to the conveying direction of the film; the extraction agent is continuously conveyed into the extraction tank; the concentration of the extraction agent is greater than 99.5%; the liquid feeding amount is (2-5)*10<5>*(v<2>*W / L)m<3> / h; W represents the width of the film and has the unit of m; L represents the extraction length and has the unit of m; v represents the speed of the film and has the unit of m / h. By adopting the process, the extraction temperature of the extraction agent can be increased, and the extraction activity can be greatly improved.

The invention provides a method for preparing an apatite coating on a pure magnesium surface. The specific proposal is adopting a two-step acid and alkali method, which comprises the steps of activating the surface of a buffed and cleaned pure magnesium substrate, soaking the substrate in the solvent of CaCl2 and K2HPO4 for pre-calcification treatment, forming a layer of unformed calcium phosphate on the pure magnesium surface, putting the pure magnesium substrate into a calcium phosphorus saturated solution for certain time, and forming a layer of even apatite coating on the surface of the pure magnesium substarte.

The invention discloses a 800MPa-level aluminum alloy extruded section and a preparation method thereof, belongs to the technical field of metal materials, and provides a large-size 800MPa-level aluminum alloy extruded section which can be used for semicontinuous casting method preparation. The 800MPa-level aluminum alloy extruded section comprises the following components in percentage by weight:9.0-12.5% of Zn, 2.5-3.5% of Mg, 0.8-1.5% of Cu, 0.08-0.15% of Zr, 0.05-0.25% of Sc, less than or equal to 0.10% of Fe, less than or equal to 0.10% of Si, less than or equal to 0.15% of other impurities and the balance of Al, wherein the percentage of each impurity is less than or equal to 0.05%. The 800MPa-level aluminum alloy extruded section is prepared through the steps of batching the raw materials according to the alloy components, melting the raw materials, carrying out furnace refining and standing, and casting an alloy ingot with a required specification by adoption of a semicontinuous casting method; and carrying out tertiary homogenization processing and extrusion process forming in the conditions that the thickness of the extruded section is not smaller than 40mm and the widthis not smaller than 150mm, and carrying out thermal treatment for using. The novel aluminum alloy extruded section is uniform in microscopic structure and stable in performance; in the L direction, the tensile strength can be above 800MPa, the yield strength can be up to 750MPa and the ductility is higher 8%; in the the LT direction, the tensile strength can be up to 750MPa, the yield strength can be up to 700MPa and the ductility is higher than 6%; and the prepared section can be widely applied in the fields of aviation, spaceflight, nuclear industry, transportation, weapons and the like.

The invention provides a rubber band filter. A rubber band is mounted on a rack through a driving roller, a driven roller and a tensioning roller; filter cloth is mounted above the rubber band; a filter cloth pressing roller is arranged at the upper part of the filter cloth; a discharging hopper is mounted above the left side of the filter cloth; isolators are uniformly distributed on the filter cloth; vertical roll devices are arranged on side surfaces of the rubber band; a rinsing hopper is arranged above the filter cloth; lifting devices, rubber band bearings, rubber band carrier rollers and a friction tape are arranged at the lower part of the rubber band; a bend roller and a scraping device are arranged on the right side of the rubber band bearings; vacuum boxes are connected with the rubber band through pipelines; automatic liquid discharging tanks are arranged on one side surface of the rack; a washing tank is arranged on the right side of the rubber band; an automatic filter cloth rectifying device is arranged on the rack and connected with a control cabinet. The rubber band filter has the advantages that the equipment is combined with a precipitation method preparation process, the goal of continuity and automation of the process is achieved, the production quality and the yield are substantially improved, the equipment utilization rate and the production efficiency are improved, and the rubber band filter has innovativeness in preparation of a catalyst with a precipitation method and other aspects.