73results about How to "Controllable wall thickness" patented technology

The invention relates to a preparation method of polysilsesquioxane hollow microspheres. In the method, a trifunctional silane monomer is used as a raw material, an organic solvent is used as a template and the polysilsesquioxane hollow microspheres are prepared by utilizing the oil-in-water (O/W) suspension polymerization. According to the invention, the raw material is easy to obtain, the reaction condition is mild, the method is simple and convenient to operate, the step of removing a template core does not need to be carried out, and the cost is low. The hollow microspheres prepared by the method disclosed by the invention are white powder particles, have a polysilsesquioxane organic-inorganic hybrid material as a component, have low density and good mechanical strength, do not contain a surfactant, have physiological inert and can be loaded with object molecules. The particle sizes of the polysilsesquioxane hollow microspheres can be controlled in the range of 200nm to 5.0mum. The polysilsesquioxane hollow microspheres can be used as high-end packing, light scattering particles, a medicament and catalyst carrier, a microreactor and the like and are widely used for the fields of chemical industry, cosmetics, catalysis, separation, medicinal preparation, environmental protection and the like.

The invention relates to submicron narrow particle size distribution type tungsten powder and tungsten carbide powder and a preparation method thereof, and belongs to the field of metallurgic powder preparation of refractory metal powder. The submicron narrow particle size distribution type tungsten powder and tungsten carbide powder are characterized in that the average particle size is 0.1 to 1.0 micron, and the maximum particle size is not greater than twice of the average particle size. The preparation method comprises the following steps: taking an ammonium tungstate solution as a raw material and a high molecular surfactant as a dispersing agent; reinforcing the dispersion effect through alcohol or ketone; quickly crystallizing and drying by spray drying to obtain fine particle hollow thin-walled spherical ammonium tungstate crystals; and performing pyrolysis, hydrogen gas reduction and carbonizing; and then generating submicron narrow particle size distribution type tungsten powder and tungsten carbide powder in situ. According to the preparation method, the submicron narrow particle size distribution type tungsten powder and tungsten carbide powder can be prepared in situ; and the technology is reformed and upgraded on the basis of the existing production condition of the enterprise, so that the scale production is easily realized, the production efficiency is high, and the effect is great.

The invention discloses a preparation method of hollow carbon bowl powder, and belongs to the technical field of preparation of inorganic materials. According to the method, a direct biological raw material or waste is adopted as a carbon source, a soft template is used as a template, and the hollow carbon bowl powder material with high dispersity, controllable particle size distribution and size,an inner hollow structure, morphology of a concave bowl-shaped structure, controllable wall thickness of the carbon bowl, and the like is prepared. The preparation method comprises the following steps: taking the carbon source, deionized water and the soft template agent as raw materials, respectively dissolving the carbon source and two surfactants in the deionized water to form three solutions,then mixing the three solutions according to a certain ratio, uniformly carrying out stirring to obtain a mixed solution, putting the mixed solution into a hydrothermal reaction kettle, and carryingout heating for a reaction to obtain a product. The method has the advantage that the direct biological raw material or biological waste is used as the carbon source, and aims to provide the novel utilization mode of biological wastes, so that emission of wastes is reduced, the wastes are converted into the functional carbon material, the process is simple, and the preparing and removing processesof a template in a hard template method is omitted.

The invention belongs to the technical field of new materials and biological materials and discloses a hollow polyphosphazenes microsphere with magnetic particles embedded in a casing layer and a preparation method thereof. The method comprises dispersing 0.02-0.1g of polystyrene microspheres into 30-300mL of ethanol; then adding 0.01-0.1g of phosphonitrilic chloride trimerl, 0.02-0.2g of 4,4'-phosphonitrilic chloride trimerl, 0.005-0.025g of magnetic particles and 1-10mL of triethylamine into the ethanol according to mass/volume ratio; after an ultrasonic reaction of 3-10 hours at the temperature of 20-60 DEG C, performing centrifugal separation, washing and drying to obtain a composite microsphere with polystyrene serving as a core and with polyphosphazenes serving as a casing, wherein the magnetic particles are embedded in the polyphosphazenes; and adding the obtained composite microspheres into tetrahydrofuran or carbon tetrachloride, evenly stirring the mixture, performing magnetic separation, drying a separated product for 12-24 hours, and obtaining the hollow polyphosphazenes microsphere with the magnetic particles embedded in the casing layer. The hollow polyphosphazenes microsphere has a unique structure that the magnetic particles are embedded inside the casing layer of the hollow microsphere, and the preparation method of the hollow polyphosphazenes microsphere withmagnetic particles embedded in the casing layer is simple in preparation process and simple and convenient to operate.

The invention provides a method for preparing a large-diameter seamless tubular product by squeezing equipment, which is used for scale production of large-diameter special alloy tubes. The method comprises the following steps: firstly, pre-processing a blank on a blank producing machine; performing turning on the outer circumference, the end face and the inner hole wall of the blank by machine tool equipment; heating the blank in a heating furnace or an electric furnace; squeezing to form a tubular billet on a large-scale squeezing machine; and finally, processing the tubular billet. The method comprises the following operation steps: a, pre-heating the squeezed blank; b, upsetting the blank; c, punching the blank; d, machining the squeezed blank; e, heating the squeezed blank; f, carrying out a squeezing process; g, cutting off an excess pressure part and taking out the squeezed tubular billet; and h, post-processing the tubular billet. According to the method provided by the invention, the large-scale squeezing equipment and the process steps with high operability are utilized, so that not only can the quality of the large-diameter seamless tubular product be ensured, but also large-diameter tubular products can be produced in scale.

The invention discloses a double-loaded core-shell hydrogel, a preparation method and an application thereof. The method includes, firstly, mixing natural polymer with adsorption functional groups anda polyacrylic acid aqueous solution, adding denitrifying bacteria, a nutrient solution and a pH regulator to obtain a core matrix after complete mixing; then adding Ca2+-containing salt and gluconicacid lactone into the nuclear matrix to obtain a mixed solution; secondly, pouring the mixed solution into a mold, dripping a hydrophilic natural polymer solution, and foaming to obtain a porous foaming shell matrix; thirdly, preforming physical crosslinking gelation forming on the porous foamed core-shell matrix to obtain a porous core-shell wet gel; placing the porous core-shell wet gel in deionized water, dialyzing and freeze drying to obtain a single-load core-shell hydrogel; and finally, soaking the single-loaded core-shell hydrogel in nitrobacteria solution and freeze-drying to obtain the double-loaded core-shell hydrogel; The preparation method has simple process operation, no pollution and wide source of raw materials, and the prepared double-loaded core-shell hydrogel has the effect of removing ammonia nitrogen.

The invention provides a preparation method of a novel glass-based porous aluminum oxide substrate. The preparation method comprises the following steps of: firstly, preparing a high purity aluminum film by using glass as a substrate and adopting a vacuum thermal evaporation method; secondly, generating a porous aluminum oxide layer by using a primary anode oxidation method or a secondary anode oxidation method; thirdly, optimizing pore diameters of the porous aluminum oxide layer by using a pore expanding process; and fourthly, improving the transmission of the whole glass-based porous aluminum oxide substrate by using high temperature annealing treatment. The glass-based porous aluminum oxide substrate has favorable mechanical strength, ordered aluminum oxide pore heights and high transmission of visible light.

The invention discloses a method for preparing rare-earth transition metal composite oxide porous hollow spheres and belongs to the field of inorganic nanometer materials and heterogeneous catalysis.The method comprises the following steps: 1, dissolving a rare-earth metal source and a transition metal source in a polyol medium, and synthesizing a solid spherical alkoxide precursor with excellentdispersion by adopting a solvothermal method; and 2, performing heat treatment on the precursor under specific conditions, and synthesizing the rare-earth transition metal composite oxide porous hollow spheres based on an unbalanced heat treatment method. The method disclosed by the invention has the advantages that the raw material price is low, the hollow structure material is directly obtained, and the prepared rare-earth transition metal composite oxide porous hollow spheres have the advantages of being uniform in metal element dispersion, controllable in composition and size, capable ofrealizing porous distribution of the shell layer and controllable in thickness; and when the hollow spheres are applied to a catalytic reaction, the contact area between the substrate molecule and catalytic active sites can be greatly enlarged, the interface synergy among different components of the rare-earth transition metal oxides contributes to transmission of reactive oxygen species at the heterogenous interface and transfer of electrons, and the activity of the catalytic oxidation reaction is obviously improved.

The invention relates to a method for manufacturing a fusion pellet based on a microfluid channel, in particular to a method for manufacturing an inertial confinement nuclear fusion pellet based on a microfluid channel technology. According to the method, dual microemulsion is formed by pellet solutions or a front fusion body in a flowing phase by adopting a microfluid channel network system, the inner diameter and the outer diameter of the dual microemulsion are adjusted in real time through an image collecting and analysis system and a flow control system, and finally a preset size is achieved. Then, hollow micro balls meeting the ICF target requirements are formed through curing and drying based on a liquid drop formwork. According to the manufacturing method, the hollow micro balls which are uniform in size and controllable in ball wall can be manufactured, and the ICF requirements are met. The manufacturing method particularly comprises the first step of manufacturing the microfluid channel, the second step of manufacturing the microemulsion, the third step of obtaining the size of the microemulsion, the fourth step of controlling the inner diameter and the outer diameter of the dual emulsion and the fifth step of manufacturing the fusion pellet.

The invention relates to a method for manufacturing a steel-plastic composite pipe with a rotational moulded inner wall and a composite glass fiber outer wall. The method aims to solve the forming problem of the steel-plastic composite pipe, the outer wall of the steel-plastic composite pipe is made of composite glass fibers, and the inner wall of the steel-plastic composite pipe is a plastic layer. The method includes the steps of manufacturing a middle steel pipe layer, founding of a rotational moulded inner layer and winding of resin glass fibers containing sand. A smooth rotational moulded inner layer of the inner wall is obtained, the process is simple, special pressing moulds are not needed, parameters such as the wall thickness and coverage are easy to control and can meet design requirements easily, viscosity between layers is strong, the bonding degree is high, and the method is especially suitable for manufacturing steel-plastic composite pipes with large apertures.

The invention relates to an automobile urea box and a forming method thereof. The automobile urea box and the forming method are characterized in that the forming method comprises the steps of (1) using an injection molding method to produce an upper half casing and a lower half casing; (2) assembling built-in parts of the upper half casing and the lower half casing after the upper half casing and the lower half casing are formed; (3) welding the assembled upper half casing and the assembled lower half casing integrally; and (4) assembling components and parts on the surfaces of the upper half casing and the lower half casing. By means of the forming method, the design free degree of the built-in parts of a box body can be improved, a large amount of raw materials can be saved, the automobile urea box is simple in structure and good in soundness, the production efficiency is improved, and a production period is shortened.

The invention discloses a method for preparing a bend t-branch pipe. The method includes the steps that a round pipe blank is cut at first according to the length required by a forming part; then an internal high-pressure forming technology is adopted to prepare the round pipe blank into a T-shaped straight tee directly; the T-shaped straight tee is bent, namely a straight tee part which has already been formed is put into a mold cavity, a mold is closed, and then the straight tee part is formed into a preforming part required; the preforming part is subjected to annealing treatment, and machining stress is removed; and a bent t-branch pipe is put into an internal high-pressure mold for conducting internal high-pressure forming after annealing, and the outer surface of the part is attached to the mold cavity to obtain a final product. The method for preparing the bend t-branch pipe has the advantages that the thickness reduction degree at the bent position is low and the using requirements can be met.

The invention provides a method of preparing linoleate isomerase micro-capsules on the basis of a polyelectrolyte layer-by-layer self-assembly technology and can solve a problem that free linoleate isomerase is poor in tolerance, is poor in stability and cannot be recycled in industrial production. The method of the invention includes the following steps: with an amorphous calcium carbonate crystal, which is obtained through co-precipitation of calcium carbonate and the linoleate isomerase, as a template and with polyallylamine hydrochloride and sodium polystyrenesulfonate as coating materials, preparing the linoleate isomerase micro-capsules through the polyelectrolyte layer-by-layer self-assembly technology. The micro-capsule is high in activity, excellent in stability and long in half life.

The invention discloses a hollow carbon sphere and a preparation method and application thereof. Firstly, a solution containing resin monomers, a surfactant, ammonia, water and alcohol is prepared, then orthosilicate is added into the solution, and orthosilicate is hydrolyzed to prepare silicon-dioxide suspension; a formaldehyde solution is added into the silicon-dioxide suspension for a polymerization reaction, and a silicon-dioxide resin composite sphere is obtained; the silicon-dioxide resin composite sphere is calcined to prepare a silicon-dioxide carbon composite sphere; silicon dioxide in the silicon-dioxide carbon composite sphere is removed through acid or alkali, and the hollow carbon sphere is obtained. The silicon-dioxide resin composite sphere is synthesized in one step, in other words, the synthesis of silicon dioxide and the resin coating process are combined to solve the problem that the two-step method of the prior art is cumbersome and needs fine regulation. The prepared hollow carbon sphere has a controllable wall thickness, a large pore volume and a large specific surface area.

The invention discloses a plug of a wire terminal. In the prior art, a plug is processed by the following steps: a column is made of a metal strip or block by a lathe, then a hole is drilled in the column by a drill press and later an expansion joint is cut by a cutting knife. Such a process has many steps, complicated technology, large processing difficulties and low production efficiency; and the plug in the technical proposal is formed by fixing a sheath block and a sheath body, wherein the sheath body is obtained by stamping a metal piece and the stamping technology is used for the manufacturing and fast formation, thus being convenient. The plug in the technical proposal is characterized by simple processing steps, small processing difficulties, high production efficiency, little processing amount, high utility rate of raw materials, secured processing quality and high yield rate, and is used in the assembly of various wire terminals and widely applicable to the wire connection of electronic and electric appliances.

The invention discloses a manufacturing process of a cross beam of a planer type milling machine. The manufacturing process comprises the following steps: making a mold of the cross beam of the planer type milling machine; putting resin sand into a mold so as to make a resin sand model; drying and patching a modeled casting mold; brushing a coating at the surface of the casting mold; preparing a pond furnace material; filling the pond furnace material into an intermediate frequency furnace to obtain a pond furnace; drying the pond furnace; making a fire in the intermediate frequency furnace; loading materials into the pond furnace; smelting materials in the intermediate frequency furnace; opening the intermediate frequency furnace to release molten iron; pouring the molten iron into a cast mold by using a crane ladle for pouring; staying the cast mold for 1-5 minutes; when a solidified layer reaches a desired thickness, pouring out excessive molten iron; after the cast mold is cooled, cleaning the cast mold so as to obtain a desired cast; carrying out shot-blasting to the cast; polishing and cleaning the cast; and brushing an anti-rust paint to the cast so as to obtain a finished product. The manufacturing process of the cross beam of the planer type milling machine, disclosed by the invention, has the advantages as follows: the production can be continuously carried out, the lifting is reduced, the production efficiency is increased and the production cost is reduced.

The invention belongs to the field of laser inertial confinement fusion, and concretely relates to a method for preparing SiC hollow microspheres. The method comprises the following steps: uniformly depositing a silicon doped glow-discharge polymer on the surface of poly-alpha-methylstyrene or polystyrene hollow microspheres in a chemical vapor deposition manner, decomposing and removing the poly-alpha-methylstyrene or polystyrene hollow microspheres at the inner layer, and pyrolyzing the silicon doped glow-discharge polymer at the outer layer to form SiC in order to obtain the SiC hollow microspheres. The SiC hollow microspheres prepared through the method have the characteristics of controllable diameter and wall thickness, good sphericility and high wall thickness uniformity, and is applied to fusion igniting engineering as a pelleting layer of a fusion target pellet.

The invention provides a high-temperature dust-removing and filtering sleeve. The high-temperature dust-removing and filtering sleeve comprises a first dust-removing pipe, a second dust-removing pipeand a plug, wherein a bottom-end pipe opening of the first dust-removing pipe is inward sealed to form a blind hole, and a top-end pipe opening of the first dust-removing pipe extends outward to forman annular plane; the porosity of the first dust-removing pipe is 85 percent to 95 percent and the pore diameter of air pores is 30 mum to 50 mum; the second dust-removing pipe is embedded into the first dust-removing pipe; the bottom-end pipe opening of the second dust-removing pipe is inward sealed to form a blind hole, and the top-end pipe opening of the second dust-removing pipe extends outward to form an annular plane; the outer diameter of the second dust-removing pipe is smaller than the inner diameter of the first dust-removing pipe and a cavity is formed; a plurality of exhausting holes, which penetrate through the cavity, are formed in the annular plane of the second dust-removing pipe; the porosity of the second dust-removing pipe is 75 percent to 85 percent and the pore diameter of the air pores is 10 mum to 30 mum; the plug is used for sealing the second dust-removing pipe; the plug is provided with exhausting hole plugs corresponding to the exhausting holes. The high-temperature dust-removing and filtering sleeve provided by the invention adopts a specific structure and rapid and deep filtering can be realized; when being used for purifying high-temperature flue gas and dust, the high-temperature dust-removing and filtering sleeve has a relatively good effect and relatively high efficiency.