Method for adjusting thickness of functional layer on surface of hollow fiber membrane
The invention relates to a method for adjusting the thickness of a functional layer on the surface of a hollow fiber membrane. Comprising the following steps: mixing a hydroxyl-containing compound with water to obtain a pre-coating liquid; mixing resin, an additive and a solvent to obtain a membrane...
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Format: | Patent |
Sprache: | chi ; eng |
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Zusammenfassung: | The invention relates to a method for adjusting the thickness of a functional layer on the surface of a hollow fiber membrane. Comprising the following steps: mixing a hydroxyl-containing compound with water to obtain a pre-coating liquid; mixing resin, an additive and a solvent to obtain a membrane casting solution; the pre-coating liquid is filled into an infiltration tank, the supporting pipe enters the infiltration tank to be infiltrated, after the surface of the supporting pipe is fully infiltrated with the pre-coating liquid, excessive material liquid outside the supporting pipe is scraped away through an extrusion device, drying is conducted, and a prefabricated supporting pipe is obtained; extruding and coating the membrane casting liquid on the surface of a prefabricated supporting tube through a spinneret plate, and airing to obtain a hollow fiber membrane with a functional layer; the method for adjusting the thickness of the functional layer on the surface of the hollow fiber membrane is used for s |
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