Abstract:
The present invention provides a method for preparing a reverse osmosis separation membrane which achieves highly improved water transmittance and fouling resistance as well as high level of salt rejection. To this end, the method for preparing a reverse osmosis separation membrane comprises: a middle layer forming step of forming a middle layer on a porous supporter; a first selection layer forming step of dipping the porous supporter on which the middle layer is formed in an organic solvent including first organic monomers to form a first selection layer on the middle layer; and a second selection layer forming step of dipping the porous supporter on which the first selection layer is formed in an organic solvent including second organic monomers to form a second selection layer on the first selection layer, wherein the first and second selection layer forming steps are alternately repeated one time or more.
Abstract:
PURPOSE: A membrane for water treatment is provided to be able to implement a membrane for water treatment with a high water permeability and membrane pollution prevention, and a manufacturing method thereof, and to be able to reduce the operation cost and to maintain the lifespan of the membrane for a long time. CONSTITUTION: A membrane (10) for water treatment includes nanofibers (20) and has a surface charge (30). The nanofibers form a net form, and have the diameter of 10-1000 nm. The nanofibers include ionic polymer and non-ionic polymer. The ionic polymer has an ionic functional group. The ionic functional group includes at least one selected from the group consisting of sulfonate, carboxylate, phosphate, amine and ammonium. The polymer having at least one functional group selected from the group consisting of sulfonate, carboxylate and phosphate includes at least one selected from the group consisting of Nafion, sulfonated polyether-ether-ketone, and carboxylated polyether-ether-ketone. A manufacturing method of a membrane for water treatment comprises a step of manufacturing a mixed solution by mixing ionic polymer and non-ionic polymer; a step of manufacturing a membrane including nanofibers with the mixed solution by using the elctrospinning method; and a step of heat-treating the membrane.
Abstract:
PURPOSE: A manufacturing method of a thermoconductive composite is provided to improve the thermal conductivity of a thermoconductive composite by controlling the direction of fibrous filler or coating the surface of the fibrous filler with a metal material with excellent thermal conductivity. CONSTITUTION: A manufacturing method of a thermoconductive composite includes a step of forming a metal layer with thermal conductivity on the surface of fibrous filler (S10); a step of impregnating the fibrous filler into a melted polymer resin (S20); and a step of curing the fibrous filler and the melted polymer resin (S30). The metal material used in the step of forming the metal layer has a higher thermal conductivity than that of the fibrous filler. The metal material is at least one selected from Al, Ag, Cu, Ni, Sn, and Pt. [Reference numerals] (S10) Step of forming a metal layer with thermal conductivity on the surface of fibrous filler; (S20) Step of impregnating the fibrous filler with the metal layer into a melted polymer resin; (S30) Step of curing the impregnated fibrous filler and the melted polymer resin