▎ 摘　　要

NOVELTY - Graphene composite filter screen comprises 30-60 wt.% polyether polyol, 20-50 wt.% toluene diisocyanate, 0.1-1 wt.% graphene material, 15-40 wt.% activated carbon powder, 0.1-1 wt.% catalyst, 0.1-5 wt.% foam stabilizer, 0.1-1 wt.% surfactant and 0.1-5 wt.% additive. USE - The graphene composite filter screen is useful in air purification for removing volatile organic compounds and airborne dust, odor, toluene, methanol and other pollutants. ADVANTAGE - The graphene composite filter screen has excellent adsorption, excellent formability, less air resistance, low pressure drop and excellent purification effect. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the graphene composite filter screen, comprising (i) adding graphene oxide powder into deionized water and ultrasonically processing at room temperature, (ii) adding surfactant and additive into solution obtained in the step (i), stirring and ultrasonically treating at room temperature to obtain graphene oxide solution, (iii) adding activated carbon powder into solution obtained in step (ii), stirring, heating, reacting and drying to obtain functional graphene-activated carbon composite powder, (iv) mixing the graphene-activated carbon composite powder with polyether polyol, toluene diisocyanate, catalyst and foam stabilizer under high-speed stirring to foam, then curing and de-molding to obtain graphene composite filter cotton, and (v) processing the graphene composite filter cotton into filter screen.