Filter material for air filter, and method for manufacturing same

Abstract

An object of the present disclosure is to provide a filter medium, for an air filter, which contains no PFASs or siloxane compounds and has a good physical property balance among the PF value, the water repellency, and the strength. A filter medium, for an air filter, according to the present disclosure is a filter medium, for an air filter, composed of a wet-laid nonwoven fabric, the filter medium including a binder resin and a water repellent, wherein the water repellent contains, as a main component, an acrylic polymer free of fluorine and silicon in a molecule thereof. A method for producing a filter medium, for an air filter, according to the present disclosure includes a step of forming a sheet in a wet state by forming a slurry of fibers into the sheet by a wet papermaking method, a step of impregnating the sheet in the wet state with an aqueous dispersion that contains a binder resin and a water repellent containing, as a main component, an acrylic polymer free of fluorine and silicon in a molecule thereof, and a step of obtaining a dry sheet by heating and drying the sheet, in a wet state, impregnated with the aqueous dispersion.

Dependencies are inferred from the claim text.