▎ 摘　　要

NOVELTY - Method for preparing hollow fiber reverse osmosis membrane, involves (i) twisting fiber filament into S-twisted yarn or Z-twisted yarn to obtain twisted yarn, (ii) blending cellulose triacetate, plasticizer and additives to obtain cellulose triacetate separation layer film-forming system, (iii) melt extruding film-forming system, uniformly coating melt on outer surface of twisted yarn, drawing into coagulation bath (A) and cooling to form fiber-reinforced cellulose triacetate reverse osmosis base membrane, (iv) uniformly dispersing adhesive and graphene oxide in solvent to obtain ultra-thin graphene oxide outer separation layer film-forming system, and (v) co-extruding reverse osmosis base membrane and film-forming system, drawing coating, uniformly coating ultra-thin graphene oxide outer separation layer film-forming system on outer surface of reverse osmosis base membrane, drawing to coagulation bath (B) to solidify film, and removing solvent. USE - The method is useful for preparing hollow fiber reverse osmosis membrane. ADVANTAGE - The method ensures high permeability flux and high desalination rate of the reverse osmosis membrane, has graphene oxide directly embedded in the outer surface of the base membrane to form a water molecule channel, which is not easy to fall off under external force and prolongs the service life of the reverse osmosis membrane. DETAILED DESCRIPTION - Method for preparing hollow fiber reverse osmosis membrane, involves (i) twisting fiber filament into S-twisted yarn or Z-twisted yarn to obtain twisted yarn, (ii) blending cellulose triacetate, plasticizer and additives in a mass ratio of (3-6):(2-5):(1-3) to obtain cellulose triacetate separation layer film-forming system, (iii) melt extruding the film-forming system obtained in step (ii) through a screw extruder, uniformly coating the melt on the outer surface of the twisted yarn obtained in step (i) through an annular spinneret, drawing into coagulation bath (A) and cooling to form a fiber-reinforced cellulose triacetate reverse osmosis base membrane, (iv) uniformly dispersing adhesive and graphene oxide in solvent to obtain an ultra-thin graphene oxide outer separation layer film-forming system, where the mass ratio of adhesive, solvent and graphene oxide is (5-20):(85-89):(0.1-10), and (v) co-extruding the reverse osmosis base membrane obtained in step (iii) and the film-forming system obtained in step (iv) from a circular spinneret using a concentric circle coating spinning process, drawing the coating in the form of a tubular liquid film around the center of the circular spinneret, uniformly coating the ultra-thin graphene oxide outer separation layer film-forming system on the outer surface of the reverse osmosis base membrane, drawing to coagulation bath (B) to solidify the film, and removing the solvent to obtain high uniformity of graphene oxide arranged in the traction direction of hollow fiber reverse osmosis membrane. An INDEPENDENT CLAIM is included for a hollow fiber reverse osmosis membrane obtained by the above method comprising an ultra-thin graphene oxide outer separation layer, a cellulose triacetate separation layer and a twisted yarn reinforcement layer from outside to inside, where the thickness of the ultra-thin graphene oxide outer separation layer is 50-200 nm, the thickness of the cellulose triacetate separation layer is 20-200 mu m, the thickness of the twisted yarn reinforcement layer is 100-500 mu m, and the reverse osmosis membrane has a permeation flux of 50-500 l.MPa/m2.hour, and desalination rate of 97-99.99%.