Melt-blown polypropylene material with long-acting filtering function and preparation method and application thereof

The invention belongs to the field of high polymer materials, and particularly relates to a melt-blown polypropylene material with a long-acting filtering function and a preparation method and application of the melt-blown polypropylene material. The melt-blown polypropylene material comprises the following components in parts by weight: 100 parts of polypropylene; 0.2-0.5 part of a peroxide initiator; 0.1-1 part of nano diatomite; 0.1-2 parts of nano tourmaline powder; 0.1-2 parts of a silane coupling agent; 0.05-0.3 part of a lubricating agent; 0.05-0.3 part of an antioxidant; and 0.05-0.2 part of a nucleating agent. The nano tourmaline powder is conveyed into pores of the nano diatomite to form the nano composite material through organic solvent infiltration and ultrasonic treatment bymeans of electronegativity and a multi-stage open pore structure of the nano tourmaline powder, so that the problem that electronegativity of melt-blown cloth taking the tourmaline powder as an electret declines due to long-t