| 摘要 |
Process of forming compact, high flux, fouling resistant gas filters by coating continuous ultra thin layer of non-porous gas permeable polymer over filter surface by contacting one side of microporous substrate with dilute coating solution of polymer, preferably amorphous copolymer of perfluoro-2,2-dimethyl-1,3-dioxole, which is hydrophobic and oleophobic. Substrate pore size filters polymer from solution as solvent flows through, leaving ultra thin layer of polymer. Residual solvent evaporated off. Process useful to coat sheet and hollow fiber substrates, particularly multiple hollow fibers assembled in modules. Coating prevents solid particles and liquid droplets from blocking flow through gas filter, which is also easily cleaned and reusable. The coated fiber modules are useful as high flow rate gas filters, including collecting suspended droplets, filtering air for microelectronic assembly plants and filtering atmosphere in biomedical clean rooms. |
