Method for thermal decomposition of used rubber, and rubber material for thermal decomposition

The present invention provides a method for thermal decomposition of used rubber, in which the method exhibits excellent yields of isoprene and limonene without lowering the thermal decomposition efficiency. The method for thermally decomposing the used rubber is characterized in that the used rubber is brought into contact with a medium or swelled with the medium and then thermally decomposed, the SP value of the medium is 8.3-11 (cal/cm3) 1/2, the endothermic peak temperature measured by thermogravimetric analysis (TGA) is 235 DEG C or higher, and the medium is liquid at 150 DEG C. 本发明提供了一种使用过的橡胶的热分解方法，其中所述方法表现出异戊二烯和柠檬烯的收率优异，而不降低热分解效率。所述使用过的橡胶的热分解方法的特征在于，在使所述使用过的橡胶与介质接触或用介质溶胀后进行热分解，所述介质的SP值为8.3～11(cal/cm3)1/2，通过热重分析(TGA)测量的吸热峰温度为235℃以上，并且在150℃下为液状。