有氧再生废轮胎橡胶粉的制备与表征

在管式炉中对废轮胎橡胶粉进行了有氧再生，并考察了气氛、再生温度和再生时间对废轮胎橡胶粉有氧再生过程的影响。结果表明，有氧条件下橡胶粉的质量损失和溶胶质量分数均随温度升高而增大，溶胶中合成胶分子链之间易发生二次重组再交联反应，天然橡胶分子链则主要发生断裂。240 ℃下橡胶粉在有氧条件下再生10 min时，溶胶质量分数达55.9%。橡胶主链和交联键断裂主要发生了氧化反应，生成含羰基和亚砜基的化合物，同时伴有水和二氧化碳等生成，说明橡胶粉中的橡胶分子链有效断链。

Preparation and characterization of aerobic recycled waste tire rubber powder

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.