"Preparation and characterization of aerobic recycled waste tire rubber powder"

Abstract

The aerobic regeneration of waste tire rubber powder was carried out in a tubular furnace, and the effects of atmosphere, regeneration temperature and regeneration time on the aerobic regeneration process of waste tire rubber powder were investigated. The results showed that the mass loss and mass fraction of sol of rubber powder increased with the increasing temperature under aerobic conditions. The secondary recombination and re-crosslinking reaction occurred in the molecular chains of synthetic rubber, while the main chain of natural rubber was mainly broken. When the rubber powder was treated under aerobic conditions for 10 min at 240 ℃, the mass fraction of sol reached 55.9%. The fracture of rubber main chain and cross-link bond was mainly broken by oxidation reaction. The aerobic reclamation of waste rubber generated the compounds containing carbonyl and sulfoxide groups, accompanying the formation of water and carbon dioxide. These phenomena indicated that the rubber molecular chain in rubber powder was effectively broken by oxidative reaction.

Keywords

• waste tire rubber powde
• aerobic regeneration
• regeneration temperature
• regeneration time
• oxidation reaction