Low-density graphene-containing polythioether sealant as well as preparation and use methods thereof

The invention belongs to the technical field of materials, and relates to a low-density graphene-containing polythioether sealant as well as preparation and use methods thereof. The sealant is composed of a component A and a component B, wherein the weight ratio of the component A to the component B is (10 to 12): 1. According to the room-temperature-vulcanization double-component polythioether sealant as well as the preparation and use methods thereof, which are disclosed by the invention, modified graphene oxide has a large shape coefficient ratio and higher barrier property than a common spherical filler, thus the sealant is enabled to obtain higher air tightness and medium resistance; the compatibility between the modified graphene oxide and a polythioether rubber is improved through grafting a long-chain alkyl group on the surface of the graphene oxide, thus the sealant is higher in mechanical property and ageing resistance; and the sealant has a density of lower than 1.0g/cm , is high in air tightness,