Rubber composition for tire tread of high-speed racing car

Abstract

The invention provides a rubber composition for the tire surface of a tire for racing. The composition is provided with 100 to 200 weight portions of carbon blacks relative to 100 weight portions of raw rubber. The carbon black consists of 5 to 90 weight portions of carbon black whose iodine (I<2>) absorption quantity is 130 to 250mg / g and DBP oil absorption quantity is 120 to 140ml / g, and 10 to 95 weight portions of carbon black whose iodine (I<2>) absorption quantity is 250 to 400mg / g and DBP oil absorption quantity is 100 to 140ml / g. the invention can increase the traction performance and even increase the durability by combining two carbon blacks whose particle sizes are different with each other.

Description

technical field [0001] The present invention relates to a rubber composition for tire treads of drag racing cars, and provides a rubber composition capable of improving grip performance especially on dry road surfaces. Background technique [0002] In rubber compositions for tire treads of drag racing cars, carbon black with a small particle size is usually used to increase the rate of heat generation and improve the grip performance on dry road surfaces. [0003] And based on such a concept, attempts have been made to add carbon black with a small particle size in an amount greater than that in general rubber compositions for tire treads in order to maximize performance improvement. [0004] However, when the amount of carbon black with a small particle size is increased in this way, the grip performance at the time of braking and handling (Handling) is improved, but on the other hand, there is a problem that the durability of the tire during running and the tire durability...

AI Technical Summary

Problems solved by technology

[0004] However, when the amount of carbon black with a small particle size is increased in this way, the grip performance at the time of braking and handling (Handling) is improved, but on the other hand, there is a problem that the durability of the tire during running and the tire durability due to the increase in continuous heat generation Disadvantages of significantly reduced wear resistance

[0005] In addition, as a method for improving the grip performance on a dry road surface, there is a technical proposal in which the glass transition temperature of the rubber is increased by using a large amount of raw material rubber containing a large amount of styrene in the rubber composition for treads ( Tg), thereby increasing the dynamic loss factor (Tanδ) on the road surface, but this still cannot avoid the decrease in tire durability and wear resistance due to the increase in heat generation during driving

[0006] Korean Patent Publication No. 2005-32414 relates to tire tread rubber compositions for racing cars, and in more detail relates to the use of novel carbon with small particle size and developed structure to increase the braking force at low temperature and the maintenance of physical properties after aging, Thereby the racing tire tread rubber composition that abrasion resistance performance is improved, and the iodine (I 2 ) adsorption capacity is 170 to 190 g / kg, and surface activity is -4 to -10, so significant improvement in grip performance cannot be expected