EM-1 is an electret master batch applied to PP meltblown cloth. It can effectively adsorb the free charge generated during electret, maintain the electret charge ability after electret treatment, and increase the electrostatic adsorption and negative ions of the mask. The ability to sterilize can effectively block droplets, dust, viruses, etc. below the micron. Under the condition of the same fiber fineness and gram weight, the resistance of non-woven products is reduced, and the filtration efficiency of non-woven products is improved at the same time.