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The invention provides an electrostatic filter material with a flame-retardant function as well as a preparation method and application thereof. The preparation method comprises the following steps: 1) melt spinning: carrying out melt spinning on a component A and a component B to form a continuous double-component composite filament with a sheath-core structure, wherein the component A at least comprises a polyolefin polymer and a functional medium with an electricity storage effect, and the component B at least comprises a polyester polymer and a functional medium with a flame retardant effect, or the component B is a polyester polymer with a flame retardant property; 2) net forming: splitting the continuous double-component composite filament with a sheath-core structure to form the net; 3) reinforcing and forming: forming a two-component spun-bonded material by hot air melting, bonding and solidifying; and 4) high-voltage electrostatic treatment: charging the double-component spun-bonded material. According to the electrostatic filter material, the electrostatic filter material is a single-layer medium-efficient filter material, so that the filter efficiency equivalent to thatof a composite filter material can be achieved, and the flame retardant standard FMVSS302 of American automobile interior trim materials and the standard of GB8410 in China can be met.

The invention provides a pleated two-component filter material, and a preparation method and use thereof. The preparation method thereof comprises the steps of: (1), performing melt spinning: performing melt spinning by adopting an A component polymer and a B component polymer, and then, forming skin-core structure continuous type two-component composite filaments, wherein a skin layer or / and a core layer contains a functional medium having the electricity storage function; (2), forming a net: forming a net after dividing the skin-core structure continuous type two-component composite filaments; (3), reinforcing and forming: performing melt gluing and solidification by adopting hot air; and (4), performing high-voltage electrostatic treatment: charging the material. According to the pleated two-component filter material in the invention, a single-layer medium-efficiency filter material can have the filtration efficiency, which is the same as the filtration efficiency of a composite filter material; simultaneously, the single-layer medium-efficiency filter material has dual filtering functions of physical blocking and electrostatic adsorption; furthermore, relatively are mechanicalstrength and stiffness are also achieved; furthermore, the filter material has very low filtration resistance and relatively high air permeability; and thus, the filter material in the invention can completely replace corresponding medium and high-efficiency filtering composite material products in the present market.