Certain materials such as wax, when incorporated into rubber formulations, bloom and form a surface barrier layer against ozone attack. The ozone resisting film results in an unpleasant appearance on the rubber surface. In tyres, sidewalls are more susceptible to ozone attack leading to degradation both in dynamic and static conditions. Also, tyre appearance is an important factor in quality control visual inspections and the acceptance of the final product in the market. In this paper, the effect of oil contents in different waxes on the physico-mechanical properties of rubber vulcanisates was investigated. It was found that in UV–Vis spectra, at different ageing times, the absorbance of extracted cured tyre sidewall compound samples at 472 nm showed the concentration of the antidegradants in the rubber vulcanisates. The migration, based on protecting function leading to degrading the antidegradants after the ageing time of 72 h. With 72 h of ageing time in the ozone chamber, the waxes with higher oil content showed a faster migration of antidegradants to the surface of the rubber vulcanisates and degraded faster than the waxes with lower oil content.

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保护蜡对轮胎胎侧配方中防污渍性能的影响

当某些材料（例如蜡）掺入橡胶配方时，它们会起霜并形成防止臭氧侵蚀的表面阻挡层。耐臭氧膜导致橡胶表面不愉快的外观。在轮胎中，侧壁更容易受到臭氧的侵蚀，从而导致其在动态和静态条件下均退化。同样，轮胎外观是质量控制外观检查和最终产品在市场上的接受程度的重要因素。本文研究了不同蜡中的含油量对橡胶硫化橡胶的物理力学性能的影响。发现在紫外-可见光谱中，在不同的老化时间下，提取的硫化轮胎胎侧胶样品在472 nm处的吸光度显示出橡胶硫化物中抗降解剂的浓度。迁移，基于保护功能，导致老化72小时后降解抗降解剂。在臭氧室中老化72小时后，含油量较高的蜡比含油量较低的蜡显示出抗降解剂向橡胶硫化橡胶表面的迁移更快，并且降解得更快。