Abstract
• Antioxidant 1222 intercalated LDHs (LDHs-1222) was successfully prepared. • LDHs-1222 has good UV shielding and free radical capture properties. • LDHs-1222 has good compatibility with asphalt. • LDHs-1222 enhanced thermal oxygen and UV ageing resistances of asphalt simultaneously. This research aims to enhance the anti-thermal oxygen and anti-ultraviolet aging properties of asphalt binder simultaneously with antioxidant intercalated UV-shielding material. For this purpose, the antioxidant 1222 with excellent thermal oxygen resistance was used to modify UV-shielding material layered double hydroxides (LDHs) to synthesize antioxidant 1222 intercalated LDHs (LDHs-1222). The crystal phase, chemical structure and micro-morphology of LDHs-1222 were characterized. The physical properties, storage stability, rheological properties and aging resistance of LDHs-1222 modified asphalt before and after thermal oxygen and UV aging were also investigated. The results showed that CO 3 2– in LDHs was substituted by phosphate group from antioxidant 1222, indicating the successful intercalation of antioxidant 1222. LDHs-1222 maintained the sheet structure and demonstrated a UV reflectivity of 70% and a radical scavenging efficiency of 84.53%, endowing it with desirable UV shielding property and free radical capture property. The incorporation of LDHs-1222 improved the storage stability of modified asphalt. LDHs-1222 modified asphalt exhibited lower complex modulus aging index, carbonyl index and sulfoxide index than LDHs, antioxidant 1222, and composite anti-ageing agent modified asphalts, indicating superior thermal oxygen ageing and UV aging resistance. 4% LDHs-1222 showed the most significant enhancement effect on anti-aging properties of asphalt.
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