A preparation method of an antifouling and hydrophilic polyethersulfone ultrafiltration membrane includes through the .sup.60Co- radiation grafting chemical modification method, evenly distributing an ionic liquid on a surface of a polyethersulfone material, wherein the ionic liquid containing unsaturated bonds is connected with the polyethersulfone material through chemical bonds, and then obtaining an asymmetric porous membrane by the immersion-precipitation phase transformation method, and finally performing Soxhlet extraction on the porous membrane, so as to migrate the grafted ionic liquid from an interior of the porous membrane to a surface of the porous membrane to be enriched, so that the adsorption and antibacterial properties of the porous membrane are improved. A mass ratio of the ionic liquid to the polyethersulfone material is in a range of (2-11):100. The ultrafiltration membrane is an asymmetric porous membrane, and has excellent antifouling properties, good pure water flux and a good BSA retention rate.

The invention disclosed herein generally relates to matrices comprising polymers and methods for preparing them.

The present invention is an integral multilayered composite membrane having at least one ultrafiltration layer made by cocasting or sequentially casting a plurality of polymer solutions onto a support to form a multilayered liquid sheet and immersing the sheet into a liquid coagulation bath to effect phase separation and form a multilayered composite membrane having at least one ultrafiltration layer.

A method of sewage treatment includes: immersing a separation membrane module into sewage, wherein the separation membrane module has a plurality of separation membrane elements, each having a supporting plate, a separation membrane and a filtered water outlet; separating water into filtered water and suspended solids by having the water permeated through the separation membrane; and having the filtered water flow toward the exterior from the filtered water outlet;
wherein the separation membrane has a nonwoven fabric and a porous resin layer on at least one surface of the nonwoven fabric; and
a part of the resin permeates into the nonwoven fabric to form a composite layer with the nonwoven fabric.

Disclosed is a method for manufacturing a composite porous film having a stable film quality and a desired hollow shape by controlling the entrance of a film-forming resin solution into a hollow part of a hollow reinforcement support. The method is provided with a step of adhering a film-forming resin solution to the outer peripheral surface of the hollow reinforcement support and thereby forming a film intermediate, a step of adhering a coagulating liquid to the outer peripheral surface of the film intermediate, and a step of flowing the coagulating liquid along the outer peripheral surface of the film intermediate so that at least a part of the outermost interface of the coagulating liquid in the circumferential direction is a free surface and thereby coagulating the film-forming resin solution adhering to the outer peripheral surface of the hollow reinforcement support.

This invention provides a polymeric separation membrane that has excellent durable antibacterial effect and stain resistance, and a preparation method thereof. The polymeric separation membrane can be widely applied for water treatment, which belongs to the field of water treatment and membrane separation science and technology. The polymeric separation membrane containing quaternary ammonium salt is prepared by the immersion precipitation phase inversion method, using quaternary ammonium salt mixed with polymer and additives. This modification method effectively improves the antibacterial and antifouling ability of the polymeric separation membrane prolongs the service life of membranes and significantly inhibits the reproduction of bacterial and microbial. The preparation method has the advantages of simple process, easy operation, easy for promotion, and also avoids expensive equipment. The polymeric separation membrane has great antibacterial ability and stain resistance, therefore, it has potential application in the field of water treatment.

The present invention relates to a method of manufacturing a hydrophilized hollow fiber membrane by a continuous process using an extruder. According to the method of the present invention, thermal curing agent in the form of a monomer or a oligomer is added to a polymer solution, and in the melt state before a separation membrane is manufactured, thermal polymerization occurs due to an initial reaction of a thermal initiator at the appropriate temperature within a cylinder of the extruder. Thus, a hydrophilic component is evenly distributed into the membrane at the micro-level, and the hydrophilic component is not washed out, resulting in very high stability. Another advantage is high economic value and efficiency because the process for hydrophilizing the membrane as well as the process for manufacturing the membrane is carried out by the continuous process using the extruder without using conventional extrusion equipment in the form of an agitator.

The present invention is an integral multilayered composite membrane having at least one ultrafiltration layer made by cocasting or sequentially casting a plurality of polymer solutions onto a support to form a multilayered liquid sheet and immersing the sheet into a liquid coagulation bath to effect phase separation and form a multilayered composite membrane having at least one ultrafiltration layer.

Disclosed are membranes formed from self-assembling block copolymers, for example, a diblock copolymer of the formula (I): ##STR00001##
wherein R.sup.1-R.sup.4, n, and m are as described herein, which find use in preparing nanoporous membranes. Embodiments of the membranes contain the block copolymer that self-assembles into a cylindrical morphology. Also disclosed is a method of preparing such membrane which involves hybrid casting a polymer solution containing the block copolymer to obtain a thin film, followed by evaporation of some of the solvent from the thin film, and coagulating the resulting this film in a bath containing a nonsolvent or poor solvent for the block copolymer.

Disclosed are membranes formed from self-assembling diblock copolymers of the formula (I): ##STR00001##
wherein R.sup.1-R.sup.4, n, and m are as described herein, which find use in preparing porous membranes. Embodiments of the membranes contain the diblock copolymer that self-assembles into a cylindrical morphology. Also disclosed is a method of preparing such a membrane which involves hybrid casting a polymer solution containing the diblock copolymer to obtain a thin film, followed by evaporation of some of the solvent from the thin film, and coagulating the resulting this film in a bath containing a nonsolvent or poor solvent for the diblock copolymer.