Stabilization of y-radiation vulcanized EPDM rubber against accelerated aging

摘要

The influence of different polyfunctional compounds on the radiation vulcanization of ethylene-propylene diene monomer (EPDM) rubber was investigated. The effect of different antioxidants and their mixtures on the thermal aging and accelerated weathering of y-radiation vulcanized EPDM rubber was also investigated. The compounds used were synergistic blends of phenolic and phosphite antioxidants, i.e. 1:4 Irganox 1076:Irgafos 168, and a blend of arylamine and quinoline type antioxidants, i.e. 1:1 IPPD:TMQ, at different concentrations. The Tinuvin 622 LD hindered amine light stabilizer was also used. The response was evaluated by the tensile strength and elongation at break of irradiated samples after thermal aging at 100℃ for 28 days and accelerated weathering (Xenon test) up to 200 h. The correlations between the type of antioxidant, concentration and efficiency were also investigated using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC).