64 results about "Modified ultrafiltration" patented technology

The invention relates to a preparation method and application of a double-modified ultrafiltration membrane of hydrophilicity and antibacterial properties. The invention belongs to the technical field of ultrafiltration membranes and aims to solve the problem that the existing ultrafiltration membrane materials are difficult to achieve double modification of hydrophilicity and antibacterial properties at the same time. Preparation method: add condensing agent and 3-dimethylaminopropylamine to the graphene oxide suspension to react, add the cleaned reactant and long-chain halogenated alkanes into an organic solvent, and fully react at 20-80°C for 8-24 hours , to obtain a quaternized graphene oxide modifier; 2. Add the quaternized graphene oxide modifier to an organic solvent for ultrasonic dispersion to obtain a GO-Q suspension, and dissolve the polymer membrane matrix material and the membrane modifier into the GO-Q suspension to obtain a uniform casting solution and cast it into shape. The invention prepares the ultrafiltration membrane with dual functions of hydrophilicity and antibacterial through the immersion precipitation phase inversion method, and the modified ultrafiltration membrane shows better mechanical performance, water treatment performance, hydrophilicity and antibacterial performance.

The invention discloses a method for preparing an amidogen-modified oxidized graphene grafting modification ultra-filtration or micro-filtration membrane. The method is characterized by including the steps of mixing oxidized graphene, dimethylformamide, an organic solvent and dicyclohexyl carbimide, conducting the ultrasonic reaction, adding absolute ethyl alcohol, obtaining amidogen-modified oxidized graphene after obtained precipitation is washed and dried, placing a basement membrane in a dopamine buffer solution with a certain concentration after being processed through infiltration, conducting surface coating on the membrane under the aeration condition, soaking the membrane in ethyl alcohol for standby application, preparing amidogen-modified oxidized graphene dispersion liquid through the amidogen-modified oxidized graphene, adding an appropriate volume of the amidogen-modified oxidized graphene dispersion liquid to a Tris-HCL buffer solution to obtain a mixed solution, soaking the basement membrane coated with polymerization dopamine in the mixed solution, and conducting the grafting reaction to obtain the amidogen-modified oxidized graphene grafting modification ultra-filtration or micro-filtration membrane. The amidogen-modified oxidized graphene grafting modification ultra-filtration or micro-filtration membrane prepared through the method has the advantages of being high in mechanical strength and high in hydrophily.