METHOD FOR MANUFACTURING FILTER MEDIUM FOR AIR FILTER

摘要

The purpose of the present invention is to provide a method for manufacturing a filter medium for an air filter in which particle-collection performance is improved using cellulose nanofibers. The method for manufacturing a filter medium for an air filter according to the present invention is a method in which a liquid mixture that contains cellulose nanofibers and a dispersion medium is caused to adhere to an air-permeable support, whereupon freeze-drying is performed, wherein the number-average fiber diameter of the cellulose nanofibers is 1-50 nm, the dispersion medium comprises a mixture of water and a water-soluble organic solvent, and the solids concentration of the cellulose fibers in the liquid mixture is 0.001-0.150% by mass.