Tire tread rubber composition for truck / bus with improved wear resistance and rolling resistance

摘要

The present invention relates to a tire tread rubber composition for a truck / bus with improved wear resistance and rolling resistance. More specifically, the carbon reinforcement is improved by using carbon black which has better surface functional group than the conventional carbon black, has a large particle size and agglomerates, and a large distribution of agglomerates, thereby improving wear resistance, rolling resistance and The present invention relates to a tire tread rubber composition for trucks and buses that can improve cut and chip performance.;The characteristics of the carbon black used in the present invention are 60 to 80 mg / g of iodine adsorption value, 60 to 80 m ² / g of nitrogen adsorption specific surface area, 120 to 140 cc / 100 g of dibutyl phthalate absorption, and 90 to 110% coloration. The carbon black has a maximum frequency (Dst) of 0.9 to 0.15 µm, a half width of the maximum frequency (ΔD50) of 0.060 to 0.068 µm, and an aggregate distribution of 0.03 to 0.45 µm. Dispersion and vulcanization characteristics are similar to the previous ones, but the rubber reinforcement improves the modulus by 300%, which greatly improves the abrasion resistance and the interaction with rubber. In addition, the 60 ° C Tanδ value, which is an index of rotational resistance, is improved by 30%, and the cut and chip characteristics can be improved.