3417results about How to "Achieve preparation" patented technology

A microfluid-based microballoon preparation method adopts a microfluid channel system to lead a colloidal solution or a pre-polymer solution to form liquid drips in a mobile phase. The formation of the liquid drip-based template is used for bioanalysis and polymeric micro spheres of protein, gene and drug screening carrier. The preparation method includes the following steps: preparation of the microfluid channel: establishing a microfluid channel network by adopting the micro-machining technology or connecting a T-shaped channel with a pinhead, a polymer pipe and a tee joint (the channel is provided with two inlets, namely, a dispersed phase inlet and a continuous phase inlet and an outlet); preparation of the liquid drip template: encasing the two phase solutions of a dispersed phase solution and a continuous phase solution respectively into a pin case, connecting with the respective inlet, digital controlling an ejector jet pump to control the velocity of flow of the two phase solutions and acquiring even and stable liquid drip template from the outlet; preparation of the microballoon: drying and solidifying the liquid drip template and removing the impurities on the surface or inside to acquire a polymer microballoon according with the requirement of bioanalysis and protein, gene and drug screening carrier.

The invention discloses a method for manufacturing a printed circuit board edge connector, relates to the field of manufacturing process for a printed circuit board, and can solve the residue problemsof an edge connector plating lead of the printed circuit board. The method for manufacturing the printed circuit board edge connector comprises the following steps: forming the edge connector platinglead and an edge connector area on the printed circuit board once, wherein the width of adjacent parts of the edge connector plating lead and the edge connector area is equal to the width of the edgeconnector area; coating a covering substance to form an edge connector plating reserved area, and plating the edge connector plating reserved area to form the edge connector; and removing the covering substance, and etching the edge connector to obtain the edge connector without the plating lead. The method is suitable for manufacturing the edge connector without the lead for the printed circuitboard.

The invention relates to soft magnetic composite powder and a magnetic powder core preparation method thereof, and belongs to the technical field of powder metallurgy and magnetic materials. According to different magnetic performance characteristics of metal soft magnetic powder, amorphous and nano-crystalline powder and ferrite powder, magnetic performances are linearly calculated and optimally designed, so that the requirements of different magnetic properties are met. Besides, powder sizes are calculated and coordinately designed, the powder is shaped, screened, annealed, coated in an insulated manner and mixed, and the powder with different components is respectively passivated and insulated, weighed according to weight ratio and uniformly mixed to form the composite powder. The prepared soft magnetic composite powder is regular in morphology and good in dispersity and has good apparent density and flowability. In addition, the magnetic performance of a magnetic powder core prepared from the soft magnetic composite powder can be calculated and designed as required, the magnetic powder core has high cost performance and good comprehensive magnetic performance, and the blank of the performance and application of an existing magnetic powder core is effectively filled in.

The invention relates to a method for manufacturing a wear-resistant antiskid dry-particle ceramic tile, which comprises the following steps: (1) forming a ceramic tile plane matrix and carrying out pattern decoration; (2) preparing dry particles with wear-resistant and antiskid properties; (3) mixing the wear-resistant antiskid dry particles, flashing dry particles and transparent dry particles according to a certain proportion for distribution; (4) applying the mixed dry particles to the surface of a decorative glazed body and spraying a temperature-resistant fixing agent; (5) conveying the obtained product to a roller kiln for firing and preparing the finished product of the ceramic tile through subsequent processes. According to the method for manufacturing the wear-resistant antiskid dry particle ceramic tile, the dry particles with good wear resistance are mixed with the transparent dry particles and the flashing dry particles, a dry powder distribution mode is adopted and the wear-resistant antiskid dry particles are bulged due to different melting performance of various dry particles in the firing process, so that the problems of wear resistance of the surface and thickness of a wear-resistant layer are solved; by distributing the transparent dry particles, a decorative pattern has a stereoscopic decorating effect under the covering of a glass layer, so that unification of wear-resistant and antiskid properties and decoration of the ceramic tile is achieved.

The invention discloses a preparation method of a high-specific-surface-area porous nitrogen-doped graphitizing carbon nanomaterial, relating to a preparation method of a carbon material and aiming at solving the problems of small specific surface area, low nitrogen content, low productivity, poor graphitizing degree and high cost of the nitrogen-doped graphitizing carbon nanomaterial prepared by the prior art. The preparation method comprises the steps of: I. preparing a complex; II. curing and carbonizing the complex; and III. carrying out acid leaching method treatment, and drying. Compared with an existing nitrogen-doped graphitizing carbon nanomaterial, the prepared high-specific-surface-area porous nitrogen-doped graphitizing carbon nanomaterial has the advantages that the graphitizing degree is improved, the nitrogen content is increased, and the specific surface area is obviously increased, and the high-specific-surface-area porous nitrogen-doped graphitizing carbon nanomaterial has obvious pore diameter distribution. The preparation method is used for preparing the high-specific-surface-area porous nitrogen-doped graphitizing carbon nanomaterial.

The invention belongs to the preparation technology of a continuous fiber reinforced ceramic based composite, and relates to a preparation method of a continuous oxide fiber reinforced oxide ceramic based composite. The technology comprises the steps that an organic ceramic precursor solution is utilized to serve as solvent to prepare slurry with ceramic powder, the slurry is smeared on the surface of oxide fiber fabric to prepare oxide fiber prepreg, the technological processes of laminating, mold pressing and sintering are conducted on the prepreg, a low-porosity ceramic based composite preform is obtained, the repeated processes of soaking and splitting are conducted by adopting an organic ceramic precursor, and the continuous fiber reinforced ceramic based composite with the ideal density is obtained. According to the preparation method of the continuous oxide fiber reinforced oxide ceramic based composite, the organic ceramic precursor is adopted to serve as the solvent to prepare the ceramic slurry, the organic ceramic precursor can play a role of bonder for bonding the ceramic powder, low-temperature inorganic characteristics of the organic ceramic precursor can be utilized, fiber is protected against thermal damage caused by high temperature in the composite preparation process, and the composite strength is improved.

The invention discloses a three-dimensional (3D) printing method of a micro-nano structure based on near-field electrostatic spinning. According to the method, a layered manufacturing principle of a 3D printing technology is combined with a near-field electrostatic spinning droplet or micro-nano fiber filament forming control technology. The method comprises the following steps: firstly, designing a part model through a computer, and processing contour data and padding data of the model to obtain relative movement data of a spray nozzle and a receiving platform; secondly, preparing micro-nano liquid flow or micro-nano fiber filaments from material liquid by controlling factors such as voltage, receiving distance, flow speed, temperature and humidity; thirdly, orderly stacking the micro-nano liquid flow or the micro-nano fiber filaments through the relative movement of the spray nozzle and the receiving platform; and finally, performing layered manufacturing and layer-by-layer stacking to further form and manufacture the micro-nano structure. According to the method, the micro-nano structure can be quickly manufactured in a multi-material and low-cost manner.

The invention relates to a microflow droplet technology-based method for one-step continuous preparation of multi-chamber calcium alginate microgel for immobilization of bioactive substances. The method realizes high-throughput continuous production of a microgel material. The method comprises forming a parallel and stable flow field through different hydrogel prepolymer solutions in a microfluidic channel, pouring the hydrogel prepolymer solutions for forming different chambers of the microgel into a microfluidic chip to form water phase solutions of multiple phase parallel fluids, mixing thewater phase solutions and an immiscible fluid (oil phase) through a T-shaped channel or a fluid focusing design to obtain water-in-oil emulsion drops and then alginic acid in the drops is linked immediately so that multi-chamber microgel is prepared, and cleaning the emulsion drops on the microfluidic chip so that the microgel is fast conveyed into a water phase. The method realizes one-step preparation of the calcium alginate microgel immobilized with bioactive substances and is suitable for industrial application.

The invention discloses hydrophilic polyethylene hollow fiber microporous membrane and preparation process thereof. Said membrane is characterized in that it mainly comprises polyethylene, amphoteric copolymer containing polyethylene oxide, and inorganic nano particles. The membrane preparing process is carried out based on thermally induced phpase separation and surface segregation principles, comprising the steps of (1) preparing membrane blank by fusion and blending of amphoteric copolymer containing polyethylene oxide, diluent, and inorganic nano particles; (2) preparing hollow fiber membrane precursor by hollow process spinning of membrane blank in molten state; (3) extracting diluent in hollow fiber membrane precursor by using organic solvent to obtain said hydrophilic polyethylene hollow fiber microporous membrane, wherein the porosity of said membrane is between 40% and 80%, and average pore diameter is between 0.1mum and 5.0mum. The microporous membrane in the invention has the characteristics of high hydrophilicity, narrow pore size distribution, high strength, and good chemical stability, and serves as micro-filtration and ultra-filtration membrane material with high performance, low cost, pollution resistance, and long serve life for water treatment.

The invention relates to (HfTaZrTiNb) C high-entropy ceramic powder and preparation methods of the high-entropy ceramic powder and high-entropy ceramic blocks. Five-face centered cube (FCC) carbonizedpowder is made into ceramic powder through a high-energy ball milling method, then a discharging plasma method is adopted to realize preparation of the high-entropy ceramic blocks, and quick sintering of ceramic within a temperature range of 1700-2350 DEG C can be realized to obtain high-entropy ceramic with single-phase-face centered cube (FCC) structure. The preparation method of (HfTaZrTiNb) Chigh-entropy block ceramic is solved; the high-entropy ceramic with the FCC structure is finally obtained by strictly controlling parameters of a discharging plasma sintering furnace or a hot press furnace and characterizing XRD, so that the ceramic material system is enriched.

The invention relates to a preparation process and a device of a nano-particle reinforced bimetal composite, the nano-particle reinforced bimetal composite comprises the following chemical components by weight percent: 6-25% of Cr, 4-18% of Ni, 1.0-4% of Mo, 1.0-1.8% of Si, 1.2-3% of Mn, 0.4-2.2% of B, 0.1-1.2% of MgO, 0.2-2% of CaF2, 0.2-0.7% of C, 0.2-0.8% of Nb, not more than 0.9% of one or the combination of CeO2, Y3O2 and La2O3, 0.0-0.8% of Co, and the balance of Fe, and mixed particles of nano-sized carbides, nitrides, borides or carbonitrides are added in alloy powder. The vacuum induction melting and the cladding processes and equipment are adopted for melting and cladding the mixture on a workpiece, the thickness of a cladding layer is 0.1-25mm, the cladding layer contains 1%-50% of nano-reinforcing particles of one or the combination of the carbides, the nitrides, the borides and silicides, and the cladding layer has special performances of wear resistance, corrosion resistance, electrical conductivity, self-lubrication performance and the like. A coating layer and a base material form the metallurgical bonding, thereby having high bonding strength, overcoming the drawbacks in various coating processes at home and abroad, leading the coating layer to avoid the defects of shrinkage cavities, inclusion, cracking, shedding and the like and having the advantages of high heating temperature, fast speed, high production efficiency, small energy consumption, simple preparation process and low cost.

The invention discloses a C/C composite material superhigh temperature ceramic coating, and a preparation method thereof. The C/C composite material superhigh temperature ceramic coating is composed of an anti-oxidation SiC transition internal layer and a superhigh temperature ablation-resistant ceramic external layer; the superhigh temperature ablation-resistant ceramic external layer is composedof more than one ingredients selected from SiC, ZrC, HfC, TaC, TiC, ZrB2, HfB2, TaB2, and TiB2. The preparation method is suitable for industrialized production, is simple in equipment, is convenientin operation, is capable of controlling coating thickness, satisfying preparation requirements of large size C/C composite material superhigh temperature ceramic coating with complex shapes, and is asuperhigh temperature ceramic coating preparation method with excellent development potential.

A process for preparing nano-class metal particles by dual-pouring method features that under the existance of protector and regulator, the metallic salt is reduced by reducing agent to obtain one ormore (30-100 nm) metallic particles. Its advantages are high dispersity, easy control of diameter, high output rate up to 95%, and preparing the particles of more metals by a single equipment.

The invention belongs to the technical field of concrete structure non-destructive microscopic detection, and specifically discloses a concrete microscopic three-phase structure visualization method based on a 3D printing technology. The method comprises the following steps: step one, subjecting a concrete test piece to CT scanning to obtain a plurality of two-dimensional tomography images of the concrete test piece in sequence; step two, cutting the obtained two-dimensional tomography images, and subjecting the cut images to three-dimensional model reconstruction; step three, sending the reconstructed three-dimensional model to a 3D printing machine, and printing a solid model by the 3D printing machine according to the received three-dimensional model. The provided method is based on a three-dimensional digital model, and is combined with a 3D printing technology. Aiming at three phases: mortar in concrete, aggregate, and pores, different composite materials are adopted to carry out 3D printing, a concrete three-phase structure interior visualization model, which cannot be produced by a conventional manufacturing technology, can be produced, and the printing is high efficient and repeatable.

This invention provides one method for producing PTFE long fiber. The raw materials for this invention is 100% PTFE, the use of processing equipment includes spiral extrusion machine, calendar, stretching machine, heating tensile machine, Slitter, twisting machines, extrusion tensile machine, and roll-up. Firstly put the PTPE into spiral extruder and crash, secondly put into heating tensile machine to heat and stretch, do it once more, thirdly cut through slitter, twist into beam by twisting Machine, fourthly roughly stretch by squeeze tensile machine, and then stretch finely by squeeze tensile machine, finally put into heating tensile machine to heat and stretch, roll up by the roll-up machine, after which the production of PTFE long fiber is done. The PTFE long fiber in this invention can produce the monofilament long fiber and multi long fiber which can be used as the fabric filter substrate of bag filter as well as high-intensity industrial sewing thread which longer the durability of the filter bag for Teflon bag.

An LED tube light having LED light sources, a light tube, end cap, power supply, and an LED light bar is disclosed. LED light bar is a bendable circuit board. One end of the light tube is attached to the end cap; a power supply disposed in end cap and the LED light bar is disposed inside light tube, LED light sources are mounted on LED light bar, the LED light sources and the power supply are electrically connected. LED light bar being bendable circuit board, includes a conductive layer, electrically connected to power supply, and a dielectric layer, the two layers are stackingly arranged, dielectric layer is disposed on the conductive layer away from the LED light sources, and fixed to an inner circumferential surface of the light tube. Bendable circuit board, at two ends thereof, is not fixed to an inner circumferential surface of the light tube.

An LED tube lamp having LED light sources, a lamp tube, end cap, power supply, a reflective film layer and an LED light bar is disclosed. The LED light bar is a bendable circuit sheet. One end of the lamp tube is attached to the end cap; a power supply disposed in end cap and the LED light bar is disposed inside lamp tube. The end cap includes an electrically insulating tubular part, sleeved with the end of the lamp tube and a magnetic metal object disposed between an inner circumferential surface of the electrically insulating tubular part and the end of lamp tube. The reflective film layer is disposed on inner circumferential surface of lamp tube, and occupying a portion of inner circumferential surface of lamp tube along circumferential direction thereof. LED light sources are disposed above or adjacently to one side of reflective film layer.

The invention relates to a rapid preparation method for a C/SiC composite material. The method is characterized by including the steps of: 1. depositing a pyrolytic carbon interface on a thin layer carbon fiber preform surface by a chemical vapor deposition process; 2. infiltrating the thin layer carbon fiber perform of the deposited PyC interface in a polycarbosilane mixed solution, and then carrying out cross-linking curing and pyrolysis in order under protective atmosphere to obtain a thin layer C/SiC composite material; 3. repeating the previous step 2-3 times; and 4. stacking a plurality of single-layer composite materials in a graphite die to conduct spark plasma sintering (SPS), thus rapidly obtaining a compact C/SiC composite material finally. The method provided by the invention makes full use of the characteristics of short thin layer infiltration time of PIP (precursor infiltration and pyrolysis) method and rapid sintering of SPS method to realize preparation of the C/SiC composite material, is suitable for compaction of small compact components, saves 95% of time than the traditional CVI (chemical vapor infiltration) method and PIP method, also significantly improves the compactness of the composite material, and reduces the making cost of the composite material.

An LED tube light which includes LED light sources mounted in LED leadframes is disclosed. The LED leadframe has a recess, a first sidewall and a second sidewall. Each LED light source includes an LED leadframe and an LED chip, in which LED chip is disposed in recess of LED leadframe. A height of first sidewall of LED leadframe is lower than a height of second sidewall thereof. Inner surface of the first sidewall is a sloped flat or curved surface facing towards outside the recess. First sidewalls of the LED leadframe are arranged along a length direction of the light tube, and second sidewalls of the LED leadframe are arranged along a width direction of the light tube. The LED tube light further includes an LED light bar. The LED light sources together with the LED leadframes are mounted on the LED light bar.

The invention discloses a chemical preparation method of nickel nano-wire which belongs to the field of the nanometer technology. The invention utilizes the mixed solution of water and ethanol to prepare the nickel ion solution which reacts with sodium hydroxide solution to generate nickel hydroxide precipitation, then utilizes hydrazine hydrate to dissolve precipitation and reduces the nickel ion under the heating condition and in the applied uniform magnetic field, finally the nickel nano-wire is assembled. Compared with the prior art, using the invention can prepare the nickel nano-wire which is 217 to 1900 nanometer in diameter, 15 to 69 micrometer in length, 20 to 300 in length-diameter ratio and has the composition of pure nickel. The invention has the advantages that the beforehand preparation process of formwork is not required, the chemical process is simple, the preparation cycle is short, the preparation cost is low and the mass preparation can be realized.

An end cap for LED tube lamp along with the LED tube lamp adopting thereof is disclosed. LED tube lamp includes a lamp tube. One end of the lamp tube is attached to the end cap; a LED light bar is disposed inside the lamp tube. The end cap includes an insulating tubular part, sleeved with the end of the lamp tube and a magnetic object disposed between an inner circumferential surface of the insulating tubular part and the end of the lamp tube. The magnetic object being of a magnetic metal member and the lamp tube are adhesively bonded by a hot melt adhesive. An inner circumferential surface of the magnetic metal member can be fully covered by the hot melt adhesive. Magnetic metal member can be in the structure of a circular or oval ring, with at least one opening, and has indentation structure on a surface thereof.