Micromechanical modeling of devulcanized ground tyre rubber, graphene platelets, and carbon black in recycled natural rubber blends
Micromechanical modeling of devulcanized ground tyre rubber, graphene platelets, and carbon black in recycled natural rubber blends
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DOI：
10.1002/app.54435
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发表时间：
2023-07
影响因子：
3
通讯作者：
J. Innes;Nehnah Siddique;M. Hebda;G. Thompson;Xiaolei Wang;P. Coates;B. Whiteside;H. Benkreira-H.-Benkr
中科院分区：
文献类型：
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作者：
J. Innes;Nehnah Siddique;M. Hebda;G. Thompson;Xiaolei Wang;P. Coates;B. Whiteside;H. Benkreira-H.-Benkr
废旧轮胎是一个全球性问题，每年产生15亿个废旧轮胎。为了减少这一问题，应该发展轮胎循环经济。这需要在轮胎产品中加入回收的轮胎橡胶。然而，大多数回收橡胶的质量不够高。再生橡胶必须与原胶发生足够好的反应，才能在3D交联网络中发挥弹性效果。虽然已经开发了广泛的脱硫化技术，但与原始橡胶相比，许多回收原始橡胶共混物的硬度显著降低。本文论证了填料补强的细观力学模型可以用来评估再生橡胶是否具有弹性有效的行为。此外，通过固态剪切球磨对磨胎橡胶(GTR)进行机械脱硫化，可以得到再生胶粉，该胶粉与天然橡胶(VNR)共混时具有弹性效果。尽管回收量很高(30/70VNR/Gtr)，但这些共混物的硬度与同等的原始橡胶相当。将纳米填料(炭黑和石墨烯纳米片)添加到这些共混物中进行评估，以了解它们与原始化合物和填料增强理论的比较情况。这一过程可能允许将硫化橡胶纳入现有产品，促进高价值橡胶回收的循环经济。
Waste tyres are a global problem, with 1.5 billion being generated annually. To reduce this problem, a circular economy for tyres should be developed. This requires the incorporation of recycled tyre rubber in tyre products. Yet, most recycled rubber is of insufficient quality. Recycled rubber must react sufficiently well with virgin rubber to be elastically effective in the 3D crosslinked network. Although a broad range of devulcanization techniques have been developed, many recycled‐virgin rubber blends show significant reductions in stiffness compared with their virgin counterparts. This paper demonstrates that micromechanical models for filler reinforcement can be used to evaluate whether recycled rubber behaves in an elastically effective manner. Furthermore, mechanical devulcanization of ground tyre rubber (GTR) by solid‐state shear milling was shown to produce a recycled rubber powder that is elastically effective when blended with virgin natural rubber (vNR). These blends match the equivalent virgin rubber stiffness, despite high‐recyclate content (30/70 vNR/GTR). The addition of nanofillers (carbon black and graphene nanoplatelets) to these blends was evaluated to see how they compared with virgin compounds and filler reinforcement theories. This process may allow for incorporation of devulcanized rubber into existing products, promoting a circular economy for high‐value rubber recycling.