Waste tires are mainly composed of natural rubber, synthetic rubber, carbon black, steel wires, and fibers. Rubber, which is a valuable resource, is one of the raw materials used for membrane preparation. In this study, a convenient and environmentally friendly synthetic technology, hot-pressing method was developed for reusing reclaimed tire rubber to prepare gas-separation membranes. The effects of the preparation conditions, including hot-pressing temperature, pressure, and time on the membrane structure and separation performance, were investigated. Thermogravimetric analysis and field-emission scanning electron microscopy were carried out. The Thermogravimetric analysis, Fourier-transform infrared spectroscopy, and cross-linking degree results showed that the reclaimed tire rubbers used in this study consisted mainly of styrene-butadiene rubber and polybutadiene rubber. Reclaimed tire rubbers with low carbon contents and low degrees of cross-linking are beneficial for fabricating membranes by hot-pressing. The hot-pressing technique proposed in this study yielded dense gas-separation membranes from the reclaimed tire rubbers, proved to be an efficient approach for simplified recycling of waste tires and can in fact inspire the development of new recycling routes. The hot-pressed membranes derived from reclaimed tire rubber showed competitive results with a CO/N selectivity of 12.8 and CO permeability of 161 Barrer.

中文翻译：

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轮胎再生胶热压制备气体分离膜的再利用


废旧轮胎主要由天然橡胶、合成橡胶、炭黑、钢丝、纤维等组成。橡胶是一种宝贵的资源，是用于膜制备的原材料之一。本研究开发了一种方便、环保的合成技术——热压法，用于回收轮胎橡胶来制备气体分离膜。考察了热压温度、压力、时间等制备条件对膜结构和分离性能的影响。进行了热重分析和场发射扫描电子显微镜。热重分析、傅里叶变换红外光谱和交联度结果表明，本研究中使用的轮胎再生胶主要由丁苯橡胶和聚丁二烯橡胶组成。低碳含量、低交联度的轮胎再生胶有利于热压制膜。本研究提出的热压技术从再生轮胎橡胶中产生致密的气体分离膜，被证明是简化废旧轮胎回收的有效方法，并且实际上可以激发新回收路线的开发。由再生轮胎橡胶制成的热压膜显示出具有竞争力的结果，CO/N 选择性为 12.8，CO 渗透性为 161 Barrer。