Method for modifying medium and low temperature coal pitch by hydrogenated styrene-butadiene segmented copolymer

The invention provides a method for modifying medium and low temperature coal pitch by hydrogenated styrene-butadiene segmented copolymer. The method for modifying the medium and low temperature coalpitch by hydrogenated styrene-butadiene segmented copolymer comprises the steps that the medium and low temperature coal pitch is smashed below 20 meshes, soluble components of the medium and low temperature coal pitch are extracted and filtered by tetrahydrofuran, and low ash content pitch is obtained after a solvent is recovered; and air is pumped in after the low ash content pitch is mixed withthe hydrogenated styrene-butadiene segmented copolymer, heating is carried out at the heating rate of 1 DEG C-10 DEG C/min to the reaction temperature 300 DEG C-360 DEG C for staying 2-6 hours, and asolid product after cooling to the room temperature is the modified pitch. The method for modifying the medium and low temperature coal pitch by hydrogenated styrene-butadiene segmented copolymer hasthe advantages of low costs