100results about How to "Uniform pore size" patented technology

The invention relates to a fat cutting filter, a fat cutting filtering method and a fat cutting filtering device.The fat cutting filter comprises a shell, the interior of the shell is a treatment cavity, and the shell is provided with a first connector and a second connector which communicate with the treatment cavity; the cutting part is located in the treatment cavity and located between the first connector and the second connector, the cutting part comprises a rigid silk screen used for cutting fat, and the silk diameter of the rigid silk screen ranges from 0.05 mm to 1 mm. The mesh wires of the rigid silk screen are used for fat cutting, the structure is simple, operation is easy, convenient and efficient, the machining cost is low, the mesh diameter can be customized according to needs, the porosity can reach 90% or above, the cutting efficiency is high, and the problem of filtering blockage during fat cutting can be effectively solved.

The invention discloses a low-temperature sintering asymmetric porous silicon carbide ceramic membrane separation layer and a preparation method thereof, the preparation method comprises the following steps: a) preparation of a coating liquid: firstly dispersing a binder in a solution, adding silicon carbide particle powder, carrying out magnetic stirring dispersion for a period of time, then adding a dispersant, and stirring; then putting the stirred and mixed film coating liquid and the grinding balls into a ball milling tank for ball milling; and adjusting the pH value of the ball-milled silicon carbide coating liquid with ammonia water, and carrying out vacuum defoaming to finally obtain the high-stability and uniformly-dispersed silicon carbide coating liquid. Wherein the addition amount of the silicon carbide coarse particles is 0.5-50 wt% of the mass of silicon carbide; b) coating; c) drying; and d) sintering. The asymmetric porous silicon carbide ceramic membrane prepared by the method is low in sintering temperature, and the prepared separation layer membrane is controllable in pore size and uniform in pore size distribution; the method has excellent application prospects in the field of membrane separation.

The invention relates to the field of sponge materials, and provides an antibacterial degradable sponge material and a preparation method thereof. The material is prepared from protocatechuic acid modified quaternized chitosan, quaternary ammonium salt grafted gelatin, sodium alginate, polyhydroxybutyrate, polycaprolactone, a polylactic acid-glycolic acid copolymer, hexamethylene diisocyanate, a foaming agent, nano cellulose, vitamin E, polyethylene glycol, triethylamine and dimethylformamide. Protocatechuic acid and quaternized chitosan are subjected to amidation modification, and chitosan and gelatin are subjected to quaternization treatment by adopting 2, 3-epoxypropyl trimethyl ammonium chloride, so that the antibacterial property and biodegradability of the material are improved. In the material preparation process, through vacuum degassing, foaming vacuum degree and humidity control and a multi-step drying process, it is ensured that the average pore size of the material is uniform (50-200 microns) and the porosity is high (50%-90%), and the obtained material has excellent antibacterial property and degradability and has wide application value.

The invention discloses a preparation method of a modified polyphenylene sulfide filament fiber diaphragm for an alkaline water electrolysis hydrogen production device, and belongs to the technical field of diaphragm preparation. The preparation method comprises the following steps: modifying polyphenylene sulfide resin by using sulfuric acid (H2SO4), hydrogen peroxide (H2O2) and acetic acid (CH3COOH), then spinning to prepare polyphenylene sulfide modified filament fibers, plying and steaming the modified filament fibers, then weaving into diaphragm base cloth, and then carrying out a hot rolling process to prepare the polyphenylene sulfide modified filament fiber diaphragm. Oxygen is introduced into the modified fiber, so that the hydrophilic performance of the diaphragm is improved, and the surface resistance and the energy consumption are further reduced; the filament fiber improves the mechanical strength of the diaphragm, optimizes the pores and aperture of the diaphragm, and reduces hairiness; the hot rolling process improves the air tightness of the diaphragm and reduces the thickness of the diaphragm, so that the surface resistance is indirectly reduced. The prepared diaphragm is high in strength, free of hairiness, high in porosity, uniform in pore diameter, good in hydrophilicity, low in surface resistance, high in air tightness, good in hot alkali durability, simple and low in cost.

The invention relates to the field of preparation of diaphragms for hydrogen production through alkaline water electrolysis, and discloses a preparation method of a polyphenylene sulfide filament fiber diaphragm for hydrogen production through an alkaline water electrolysis tank. The preparation method comprises the following steps: melting polyphenylene sulfide resin to prepare filament fibers, carrying out yarn steaming, plying and plied yarn steaming on the filament fibers, weaving the filament fibers into plain weave diaphragm base cloth, and carrying out sulfonation, hot rolling shaping and other processes to prepare the polyphenylene sulfide filament fiber diaphragm. The polyphenylene sulfide filament fiber used in the invention can provide high mechanical strength for the diaphragm, and can optimize the pore structure and aperture of the diaphragm; the hydrophilic performance of the diaphragm can be remarkably improved through sulfonation treatment, so that the surface resistance and the electrolysis energy consumption of the diaphragm are reduced; the hot rolling shaping treatment can improve the air tightness of the diaphragm and reduce the thickness of the diaphragm. Therefore, the prepared diaphragm is high in mechanical strength, free of hairiness, high in porosity, uniform in pore diameter, good in hydrophilicity, low in surface resistance, high in air tightness and good in hot alkali durability, and the preparation method is simple and good in economical efficiency.