The disposal of recycled tires is a problem that has gained considerable importance since it has involved the environmental as well as various disciplines and points of view. Currently, the burning and outdoor storage of disposed tires are forbidden practices because of their polluting effect, damage to health and the fact that they contribute to the spread of diseases due to vectors such as insects. Therefore, it is important to research alternative methods that provide added value. In this work, waste ground tire rubber was treated by applying a combination of oxidation with potassium permanganate/hydrogen peroxide, followed by microwave exposure in the presence of a devulcanizing agent. Devulcanized tire rubber was analyzed by Fourier transform infrared spectroscopy, differential scanning calorimetry, thermogravimetric analysis, cross-link density and sol fraction. Styrene butadiene rubber composites were prepared using devulcanized tire rubber and sulfur cure system. The blends were mixed in a two roll mill laboratory. The vulcanized specimens were obtained by compression molding. Curing properties, tensile and tear strength, elongation at break, hardness (Shore A units), abrasion resistance (mm³), and compression set of these rubber composites were evaluated and the morphology of the fractured surfaces from tensile specimens were analyzed with scanning electron microscopy. The results showed that microwave exposure with devulcanizing agent reduced the cross-link density and increased the soluble fraction of rubber tire. Improved flow through viscosity reduction (low torque) and higher mechanical strength were obtained by compounding styrene butadiene rubber with ground rubber tire (thermo-oxidized followed by microwave exposure with devulcanizing agent), whose market values were similar to those obtained for virgin styrene butadiene rubber/silica composite.

中文翻译：

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地面轮胎橡胶的脱硫：热氧化，然后在脱硫剂存在下进行微波暴露

回收轮胎的处理已经变得相当重要，因为它涉及环境以及各种学科和观点。目前，废弃轮胎的焚烧和户外存放是禁止的，因为它们会造成污染，损害健康，并且由于诸如昆虫的病媒而导致疾病的传播。因此，研究提供附加值的替代方法很重要。在这项工作中，对废磨碎的轮胎橡胶进行了处理，方法是将其与高锰酸钾/过氧化氢进行氧化反应，然后在脱硫剂的存在下进行微波照射。通过傅里叶变换红外光谱，差示扫描量热法，热重分析，交联密度和溶胶分数。苯乙烯丁二烯橡胶复合材料是使用脱硫轮胎橡胶和硫磺硫化体系制备的。将混合物在两辊磨机实验室中混合。通过压缩成型获得硫化样品。固化性能，拉伸强度和撕裂强度，断裂伸长率，硬度（邵氏A单位），耐磨性（毫米）³），评估这些橡胶复合材料的压缩永久变形，并用扫描电子显微镜分析拉伸样品的断裂表面的形态。结果表明，脱硫剂暴露于微波下会降低交联密度，并增加橡胶轮胎的可溶性分数。通过将苯乙烯丁二烯橡胶与磨碎的橡胶轮胎混合（热氧化，然后与脱硫剂进行微波暴露），可获得改善的流动性以降低粘度（低扭矩）和更高的机械强度，其市场价值与原始苯乙烯丁二烯橡胶的市场价值相似。 /二氧化硅复合材料。