Reclaimed rubber should be considered a source of new material with an economic impact, so the recycling of waste rubber is especially important. In this paper, sulfur-cured waste tire rubber powder is successfully devulcanized in a normal-pressure continuous regeneration system under the application of an activator and aromatic oil. Then, the reclaimed rubber was subjected to further mechanical shearing using a two-roll mill, rubber extruder, and rubber strainer. The effects of the storage time at room temperature on the properties and structure of reclaimed rubber were examined by sol fraction measurement, Mooney viscosity measurement, crosslink density measurement, tensile property testing, and Rubber Process Analyzer (RPA) measurement. The results under the test conditions indicated that different postprocessing operations were not making much difference to the properties of the reclaimed rubber. But the effect of storage time is more significant; the Mooney viscosity value increased from 65 to 90 when the storage period increases to 60 days, the sol fraction decreased, and the crosslink and density storage modulus also increased with increasing storage time due to the slow recombination and aggregation of the molecular fragments with free radicals happening in the reclaimed rubber during the storage.

中文翻译：

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后处理对再生橡胶储存稳定性的影响

再生橡胶应被视为具有经济影响的新材料来源，因此废橡胶的回收尤为重要。本文在活化剂和芳香油的应用下，将硫化硫化的废轮胎橡胶粉成功地在常压连续再生系统中脱硫。然后，使用两辊磨机，橡胶挤出机和橡胶过滤器对回收的橡胶进行进一步的机械剪切。通过溶胶分数测量，门尼粘度测量，交联密度测量，拉伸性能测试和橡胶过程分析仪（RPA）测量，考察了室温下储存时间对再生橡胶性能和结构的影响。在测试条件下的结果表明，不同的后处理操作对再生橡胶的性能影响不大。但是存储时间的影响更为显着。贮存期增加到60天时，门尼粘度值从65增加到90，溶胶分数降低，并且交联和密度贮存模量也随着贮存时间的增加而增加，这是由于分子片段与自由基的缓慢重组和聚集所致。在储存过程中发生在再生橡胶中。