Preparation method of high-temperature-resistant electret filtering material

The invention provides a preparation method of a high-temperature-resistant electret filter material, which comprises the following steps: dispersing nano SiO2 particles in an electret filter material, and introducing the nano SiO2 particles into a polysulfonamide spinning solution as electret particles to obtain the high-temperature-resistant SiO2/polysulfonamide electret nano composite filter material. The invention also provides a high-temperature-resistant electret nano composite filter material prepared by the method. The preparation method is simple in process and strong in operability,SiO2 particles are uniformly dispersed in a polysulfonamide matrix in a nano scale by utilizing an ultrasonic blending technology, and the composite fiber material is subjected to an electret treatment by virtue of a corona discharge technology, so that the obtained electret air filtering material has the characteristics of high filtering efficiency, small air resistance, high temperature resistance and long service life.