Seamless expansion joint filling material sealant and preparing method and application thereof

The invention provides a seamless expansion joint filling material sealant and a preparing method and application thereof, and belongs to the field of road building materials and engineering. The seamless expansion joint filling material sealant is prepared from, by mass, 100 parts of 90# asphalt, 1-2 parts of a tackifier, 4-6 parts of SBS, 1-2 parts of a plasticizer, 2-4 parts of a toughening agent P4U, 0.2-0.5 part of a stabilizer and 0.2-0.5 part of a bulking agent. According to the seamless expansion joint filling material sealant and the preparing method and application thereof, by designing the raw materials and proportion of the sealant, the sealant has good viscoelasticity, toughness, rut resistance and resistance to shock-produced deformation, the requirement for adapting to deformation, load and other complicated working conditions in high-temperature and low-temperature environments is met, the problems that existing materials are easily cracked and moved under pushing, andthe adhesion power betwee