61results about How to "Consistent pore size" patented technology

The invention discloses a method and technique for preparing and transferring an ultrathin perforated anode alumina template and aims to mainly solve the problem that an existing anode alumina template cannot be used for directly preparing a mono-crystal nanometer point array. The method comprises the following steps: oxidizing an electrochemically-polished aluminum plate twice in an oxalic acid solution; oxidizing twice again, spin-coating polystyrene PS on the surface of anode alumina and removing an aluminum base and a barrier layer from the bottom surface of the anode alumina to obtain a perforated anode alumina template; finally transferring the template to a substrate of a subsequent required growth material; removing the spin-coated polystyrene PS from the surface by using chloroform to obtain a base plate of the perforated anode alumina template. The base plate of the perforated anode alumina template, obtained by the method disclosed by the invention, is uniformly distributed and uniform in hole diameter; the thickness of the template is nanometer grade; in comparison with the micrometer-grade thickness in the prior art, the thickness of the template prepared by the method disclosed by the invention can guarantee the adhesion between the template and the substrate, and the template can be used for preparing the mono-crystal nanometer point array.

The invention relates to a technology for preparing a micropore pipe through semi-molten continuous extrusion of high molecular powder. The technology is characterized by comprising the following steps: (1) feeding solid powdered material in a screw extruding device through a hopper; (2) heating a barrel entering the screw extruding device, and performing initial compaction by a threaded rod at the same time so as to enable materials to be in a semi-molten state; (3) feeding the material in a handpiece for further compaction; (4) feeding the materials in a mould cavity of a neck mould of the screw extruding device to be tubular, determining inner and outer diameters under the effect of a vacuum cooling forming sleeve, and initially cooling; (5) cutting through a cutting device to obtain the micropore pipe. According to the technology, the high molecular powder is continuously extruded and formed when being in semi-molten state and the produced product does not need to be subjected to aftertreatment simultaneously when production of micropore pipes is realized, so that the production efficiency is greatly improved. According to the technology, a solvent is not used, and thus the micropore pipe is beneficial to environmental protection and health of operators.

The invention provides a method for preparing pore-size-controllable silicon carbide ceramic by means of three dimensional (3D) molding, belonging to the technical field of 3D printing. The method comprises the following steps: separately and uniformly coating two types of silicon carbide powder, having different particle sizes, with a mixture of polycarbosilane and silicon dioxide powder to obtain coarse, median and fine coated composite powder with three particle sizes, and mixing the obtained coarse, median and fine coated composite powder with three particle sizes according to a mass ratioof 100 to (0.2-1.6) to obtain printing powder; molding the printing powder by using a direct three-dimensional printing molding machine to obtain a ceramic green body, wherein ink used for the three-dimensional printing molding machine is a tetrahydrofuran solution of polycarbosilane having a mass concentration of 0.5-1.3%; sintering the ceramic green body obtained in the step (4) at a high temperature to obtain the pore-size-controllable silicon carbide ceramic. The method provided by the invention realizes the control of the pore size of the silicon carbide ceramic product by adjusting thecoarse powder median particle diameter D50.

The invention discloses an auxiliary laser repeating punching method for ceramics based on a static solution. The method comprises the steps that a fixing workpiece is soaked in a cooling solution ofa solution groove, the defocus amount of a laser to the to-be-processed workpiece is adjusted to 0, then a mist removal device and a laser emitter are started for primary punching, after primary punching, the defocus amount of the laser is adjusted to a negative value, secondary punching is conducted, and after secondary punching, the to-be-processed workpiece is taken out for cleaning. The invention further a laser repeating punching device. The device comprises a laser system, a mist removal fan, a machine tool working table, the solution groove, a workpiece clamp, a machine tool base and areflection mirror. According to the method and device, through the cooking and flushing effect of the static cooling solution and a laser repeating punching mode, processing cracks are reduced, the hole taper is lowered, the hole roundness is improved, and the effect of slag attachment and a recasting layer is reduced. Therefore, the punching quality is improved, the device is suitable for being transformed on the basis of existing equipment, simple in structure, easy to implement and low in cost, and the implementation method is simple.

The invention discloses a hot melt laminating device and hot melt laminating method of a membrane filter material. A high-temperature hot roller, a composite glue roller and a cooling roller are sequentially arranged in the vertical direction from top to bottom; a gap adjusting device is arranged between the high-temperature hot roller and the composite glue roller; and a stripping roller is tightly abutted against the cloth outlet side of the composite glue roller. A polytetrafluoroethylene membrane and a base material are synchronously input between the high-temperature hot roller and the composite glue roller in a hot melt laminating process, and are stripped by the stripping roller and rolled after a hot press forming process. The roller diameters of the high-temperature hot roller and the cooling roller are the same, and the diameters of the high-temperature hot roller and the cooling roller are phi 360-600mm; the roller diameters of the composite glue roller and the stripping roller are the same, the diameters of the composite glue roller and the stripping roller are phi 150-300mm, and a diameter ratio of the composite glue roller and the stripping roller is in a range of 1.8-2.4. The hot melt laminating device is reasonable in structure; the composite glue roller has good cooling effect and long service life; the service life is up to 8-12 months; and the composite glue roller has convenience in replacement and maintenance. The polytetrafluoroethylene membrane filter material produced by the invention ensures the physical properties and the chemical properties of the polytetrafluoroethylene membrane, and has small damage on the polytetrafluoroethylene membrane; the prepared membrane filter material and the used polytetrafluoroethylene membrane have the same pore size; and the filter efficiency of the membrane filter material is improved.

The invention discloses a method for preparing a zirconia ceramic ultrafiltration membrane. The method is characterized by comprising the following steps: preparing a zirconia sol by using a sol-gel method; uniformly mixing the zirconia sol with a certain amount of water as well as one or more of polyethylene glycol, polyvinyl alcohol, methylcellulose and glycerinum so as to obtain a film coating liquid; impregnating the film coating liquid onto the surface of a ceramic filtering membrane substrate; and drying the substrate after the coating, further soaking the dried substrate into a nitric acid solution of which the pH value is 1-3 in a high-temperature reaction kettle, and carrying out a hydrothermal reaction at 180-220 DEG C, so as to obtain a ceramic ultrafiltration membrane with a uniform aperture of 10-20nm.

The invention provides a production method of a nano-attapulgite composite catalyst for 3-methylpyridine preparation. The method comprises following steps: nano-attapulgite raw ore is added to an aqueous hydrochloric acid solution for separating and washing, then a silver nitrate solution is utilized for washing, a mixed solution is heated and boiled by distilled water, centrifugal washing is performed, and acid modified nano-attapulgite is obtained; the acid modified nano-attapulgite is mixed uniformly with zeolite molecular sieves, a mixture is added to an aqueous aluminium hydroxide solution and mixed uniformly, a mixed solution is dried, ground and calcined at high temperature, and nano-attapulgite composite supports are obtained; the nano-attapulgite composite supports are added to silicon dioxide sol, sufficient adsorption, drying and grinding are performed, and the nano-attapulgite composite catalyst for the 3-methylpyridine preparation is obtained. According to the prepared catalyst, the zeolite molecular sieves and attapulgite are taken as the composite supports, and aluminium oxide and silicon dioxide are adsorbed into multi-stage support pores, so that catalyst is high in strength, low in cost and good in dispersibility and has good selectivity and high product yield in the 3-methylpyridine preparation.

The invention discloses a nuclear pore film-based solid electrolyte film and a preparation method thereof. A polyimide heavy ion track etching porous film is used as a base film, polyimide can resisthigh temperature of 400 DEG C, can stably work within the temperature range of -200 to 300 DEG C, has extremely low contractibility, and has excellent mechanical properties and insulativity. Due to the excellent performance of the polyimide film, the high mechanical property and thermal stability of the prepared electrolyte diaphragm are ensured. The film (nuclear pore film) prepared by the heavyion track etching technology has the advantages of consistent pore diameter, controllable size and convenient and adjustable pore density. The polymer chain electrolyte is filled in the nanopores of the polyimide heavy ion track etching film, and the spatial confinement effect of the directionally arranged nanopores enables the polymer chain to extend along the direction of the nanopores, so thatthe glass transition temperature of the polymer is reduced, and the lithium ion conductivity of the polymer electrolyte is improved; therefore, the all-solid-state lithium ion battery or the lithium metal battery has excellent safety performance and battery performance.

The invention provides a method for preparing pore-size-controllable silicon carbide ceramic by means of three dimensional (3D) molding, belonging to the technical field of 3D printing. The method comprises the following steps: separately and uniformly coating two types of silicon carbide powder, having different particle sizes, with a mixture of polycarbosilane and silicon dioxide powder to obtain coarse, median and fine coated composite powder with three particle sizes, and mixing the obtained coarse, median and fine coated composite powder with three particle sizes according to a mass ratioof 100 to (0.2-1.6) to obtain printing powder; molding the printing powder by using a direct three-dimensional printing molding machine to obtain a ceramic green body, wherein ink used for the three-dimensional printing molding machine is a tetrahydrofuran solution of polycarbosilane having a mass concentration of 0.5-1.3%; sintering the ceramic green body obtained in the step (4) at a high temperature to obtain the pore-size-controllable silicon carbide ceramic. The method provided by the invention realizes the control of the pore size of the silicon carbide ceramic product by adjusting thecoarse powder median particle diameter D50.

A construction method for the renovation of fair-faced concrete facings on existing building exterior walls, including formwork processing, steel bar binding, fair-faced formwork installation, fair-faced concrete pouring, clear-water formwork removal, fair-faced concrete curing, open joint cutting, and installation of pull bolt holes Sealing and trimming, protective paint coating, the construction method uses the steel formwork with stainless steel plates on the inner surface as the clear-water formwork, the steel mesh as the structural reinforcement, and the self-compacting clear-water concrete as the clear-water concrete mixture. The construction of the thin-layer clear-faced concrete facing wall is completed in the way of repeated molding construction from the bottom of the building exterior wall to its top section. The invention not only improves the appearance quality of the fair-faced concrete, but also ensures the close combination of the freshly poured fair-faced concrete and the exterior wall of the existing building.

The invention discloses a preparation method of cement foamed heat insulation board, and belongs to the field of building materials. The preparation method comprises the following steps of : taking raw materials in parts by weight, afterwards, firstly uniformly agitating and mixing cement, a silicon-acrylate emulsion, a water reducer and a catalyst in the raw materials, adding water, agitating, next, adding a compound foaming agent and an additive in the raw materials, continuously agitating, then collecting an agitated mixture, and standing, foaming, standing at a room temperature and demolding to obtain a demolded matter, and maintaining and drying the demolded matter, so that the cement foamed heat insulation board can be obtained. The preparation method has the beneficial effects that pores of the cement foamed heat insulation board are consistent in aperture size and uniformly distributed; meanwhile, the cement foamed heat insulation board has higher compression strength, and is worth to be popularized and used.

The invention belongs to the technical field of capacitive pressure sensors, and particularly relates to a capacitive pressure sensor and a preparation method thereof. The sensor comprises electrodes,an ionic gel dielectric layer and wires, wherein the electrode is composed of a substrate of which the surface is provided with a silver nanowire layer; a wire extending to the outside of the silvernanowire layer is embedded in the silver nanowire layer; the ionic gel dielectric layer is arranged on the surfaces of the silver nanowire layers on the top electrode and the bottom electrode; the structure of the ionic gel dielectric layer is as follows: columnar ionic gel is distributed on the surface of a substrate layer; wherein the substrate layer in the ionic gel dielectric layer is arrangedon the silver nanowire layer of one electrode, and the silver nanowire layer of the other electrode is arranged on the columnar ionic gel in the ionic gel dielectric layer. The prepared sensor is high in sensitivity, small in hysteresis and good in repeatability, and can be widely applied to electronic skin, wearable products, implantation equipment and multifunctional sensor systems.

The invention discloses a method for preparing a zirconia ceramic ultrafiltration membrane. The method is characterized in that: a sol-gel method is used to prepare a zirconia sol; Mix one or more of vinyl alcohol, methyl cellulose, and glycerin evenly to prepare a coating solution; impregnate the coating solution on the surface of the ceramic filter membrane substrate; dry the coated substrate, and then immerse it in a high-pressure reaction In the nitric acid aqueous solution with a pH of 1-3 in the kettle, a hydrothermal reaction is carried out at 180-220°C to form a ceramic ultrafiltration membrane with a uniform pore size of 10-20nm.