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...