A kind of preparation method of reinforced composite hollow fiber membrane

Abstract

The invention discloses a preparation method of an enhanced compound hollow fiber film, belonging to the technical field of the preparation of hollow fiber films. According to the preparation method,a PET braided pipe is degreased by virtue of an NaOH solution, so that a spinning oil agent and blots remained on a braided pipe are removed, and the bonding strength between a separation layer formedby film casting liquid and a transition layer formed by gel liquid is enhanced; sodium alginate is partially oxidized by virtue of sodium periodate so as to generate oxidized sodium alginate containing aldehyde groups, and oxidized sodium alginate can be chemically crosslinked with high-molecular compounds such as amino so as to generate hydrogel, so that the flux of water-base components can beincreased; the surface of cellosilk of the braided pipe is coated with polymer film casting liquid by virtue of a padding process, and the padding braided pipe is subjected to round pipe formation, sothat the pollution resistance and entrapment capacity of the compound film are improved; and the prepared gel liquid contains toughening fibers such as bone gelatin liquid and cobwebs, so that the radial and axial tensile properties of the hollow fiber film are improved, and the hollow fiber film has wide application prospects.

Description

technical field [0001] The invention discloses a method for preparing a reinforced composite hollow fiber membrane, which belongs to the technical field of hollow fiber membrane preparation. Background technique [0002] The hollow fiber membrane looks like a fiber-like, self-supporting membrane. The hollow fiber membrane is made of polysulfone and dimethylacetamide as raw materials to process into a hollow fiber filament, and then divided by a high-permeability polymer, which has selective permeability characteristics. Since water vapor, hydrogen, ammonia and carbon dioxide permeate quickly, while methane, nitrogen, argon, oxygen and carbon monoxide permeate slowly, this separates the fast permeating from the slow permeating. The outer diameter of the hollow fiber is usually 500-600 pum, and the inner diameter is 200-300 pum. It is made into a fiber bundle of 3-6 meters and loaded into a high-pressure metal shell. One end of the fiber bundle is sealed, and the other end is...

AI Technical Summary

Problems solved by technology

[0005] The main technical problem to be solved by the present invention is that the strength of the hollow fiber membrane wall is relatively poor at present. After most hollow fiber membranes undergo heterogeneous reinforcement, the reinforcement body will expand and contract with the swing of the membrane, resulting in damage to the structure of the reinforcement body, and the reinforcement Excessive stretching deformation of the body will cause irreversible physical damage to the separation layer on the surface of the membrane, resulting in a decrease in the separation function of the membrane, a decrease in flux, and a decrease in interception. The existing hollow fiber membrane still has the problem of interlayer compatibility. After gelation, a smooth interface will be formed, and the bonding strength between the separation layer and the transition layer is still poor. A method for preparing a reinforced composite hollow fiber membrane is provided.