Hollow fiber film and method for producing the same

Abstract

The invention relates to a hollow fiber membrane and a manufacturing method thereof. The weight percentage prescription of the membrane forming system of the membrane is: 25 to 45 percent of polyurethane; 35 to 60 percent of compound pore-forming agent; 15 to 20 percent of organic low molecular; the sum of each component is 100 percent; wherein, the polyurethane is a fiber grade; the weight ratio of a hard section and a soft section is 1/1 to 1/5; the compound pore-forming agent is the mixture of an interface cavity pore-forming agent and a non-interface cavity pore-forming agent; the organic low molecular liquid is a good water-soluble polyurethane solvent with a high boiling point; the manufacturing method of the membrane adopts the following melt spinning technique: firstly the prescription of the invention demands the preparation of a polymer membrane forming system; then the polymer membrane forming system is poured into a mixing tank to carry out heating, reinforcing and pre-mixing with a heating temperature of 130 to 140 DEG C; the polymer membrane forming system is injected into a double screw extruder after being uniformly mixed; melt blending spinning is carried out to manufacture the membrane under the temperature of 130 to 155 DEG C; then the hollow fiber membrane is obtained after the normal working procedure of water extraction washing.

Description

technical field [0001] The invention relates to a preparation technology of a hollow fiber membrane, specifically a hollow fiber membrane with good elastic function and a manufacturing method thereof. The International Patent Main Classification No. is intended to be Int. Background technique [0002] Polyurethane (polyurethane) is a kind of block copolymer formed by alternating connection of soft and hard segments. Excellent resilience, and the hard segment provides nodes for the elongation deformation and rebound of the soft segment. The unique chemical structure of polyurethane makes it have many properties such as high elasticity, high strength, heat resistance, wear resistance, and chemical resistance, and has been widely used in industries such as automobiles, shoemaking, and wires and cables. In 1970, Bowen proposed that polyurethane could be used as a selective adsorbent for certain substances. Since then, the application of polyurethane in membrane materials has gr...

AI Technical Summary

Problems solved by technology

However, this technology consumes a large amount of solvent, which is easy to pollute the environment, and the mechanical properties of the obtained fiber membrane and the shape recovery during the pressure response process are not ideal.

Conventional melting or melt spinning methods do not require solvents, and the process flow is short, but the structure of the obtained fiber membrane is usually relatively dense, difficult to form holes, and the pore size is difficult to control; especially its high spinning temperature consumes more energy. There are many, and the thermal stability requirements for polymers and porogens are also relatively strict. Therefore, reducing the temperature of melt spinning to save energy, controlling the precision and structure of membrane pores, and improving product performance are the advantages of melt spinning. , and the key technology to make it suitable for spinning hollow fibers

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