The challenges of silica-silane reinforcement of natural rubber
The challenges of silica-silane reinforcement of natural rubber
复制标题
天然橡胶二氧化硅-硅烷补强的挑战
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
J. Noordermeer
中科院分区：
文献类型：
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作者：
W. Dierkes;S. S. Sarkawi;J. Noordermeer
近年来，高分散性二氧化硅已成为炭黑的首选替代品，作为低滚动阻力轮胎的补强填料。然而，这种填充系统的应用到目前为止仅限于乘用车轮胎，因为它们的胎面含有苯乙烯丁二烯橡胶（SBR）。与此相反，卡车轮胎主要由天然橡胶（NR）制成；这是目前使用的1100万吨天然橡胶的主要用途。不幸的是，NR 与二氧化硅和偶联剂的组合仍然是一个挑战。天然橡胶是一种耐用的自然资源，但缺点是含有多种非橡胶成分，例如蛋白质。对二氧化硅与天然橡胶中存在的蛋白质相互作用的橡胶内研究表明，后者在硅烷化反应过程中与偶联剂竞争；蛋白质的存在使得硅烷改善分散性和填料聚合物偶联的效率降低，从而对橡胶材料的最终性能产生负面影响。此外，蛋白质
含量影响流变性能以及填料与填料以及填料与聚合物的相互作用。应力应变特性也随着蛋白质含量的变化而变化，动态特性也是如此。由于 NR 中存在大量蛋白质，蛋白质和二氧化硅之间的相互作用能够破坏二氧化硅-二氧化硅网络并改善二氧化硅分散性。大量的蛋白质降低了填料-聚合物网络形成的热敏感性。当不使用硅烷时，蛋白质的效果最为明显；然而，蛋白质不能替代偶联剂。为了实现良好的性能平衡，偶联剂的存在是必不可少的。关键词：二氧化硅、硅烷、天然橡胶、蛋白质、滚动阻力。
In recent years, highly-dispersible silica has become the preferred alternative to carbon-black as reinforcing filler for low rolling-resistance tires. However, the application of this filler system is so far limited to passenger car tires, as their treads contain styrene butadiene rubber (SBR). In contrast to this, truck tires are mainly made from natural rubber (NR); this is the main application of the currently used 11 million tons of natural rubber. unfortunately, the combination of NR with silica and a coupling agent remains a challenge. Natural rubber is a durable, natural resource, but has the disadvantage of containing a variety of non-rubber components such as proteins. An in-rubber study of the interaction of silica with proteins present in natural rubber shows that the latter compete with the coupling agent during the silanization reaction; the presence of proteins makes the silane less efficient for improving dispersion and fillerpolymer coupling, and thus negatively influences the final properties of the rubber material. Furthermore, the protein
content influences the rheological properties as well as filler-filler and filler-polymer interactions. Stress strain properties also vary with protein content, as do dynamic properties. With high amounts of proteins present in NR, the interactions between proteins and silica are able to disrupt the silica-silica network and improve silica dispersion. High amounts of proteins reduce the thermal sensitivity of the filler-polymer network formation. The effect of proteins is most pronounced when no silane is used; however, proteins are not able to replace a coupling agent. In order to achieve a good balance of properties, the presence of a coupling agent is essential. Keywords: silica, silane, natural rubber, protein, rolling resistance.