• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >The study and the prediction of the rheology and processing of tire compounds.
【24h】

The study and the prediction of the rheology and processing of tire compounds.

机译：轮胎胶料流变学和加工的研究和预测。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

One way to obtain a tire that exhibits both low rolling resistance and high wet traction is to use precipitated silica together with solution polymers (rather than emulsion polymers) and a silane coupling agent in the tread. However, the use of silica compounds entails considerable disadvantages in terms of raw material costs and processability (before vulcanization) compared to carbon black-filled treads. Therefore, the improvement in the processability, especially of stored, uncured silica-filled rubber stocks, is an important issue. One of the objectives of this study is to suggest new additives for silica-filled tire tread compounds that retard the degradation of processability while maintaining the mechanical properties of the vulcanizates. To achieve this objective, we improved our understanding of the phenomenon of storage of uncured filled elastomers and its effects on both rheology and processability.; Effects of storage temperature and storage time on the rheological properties of model tire compounds were characterized. Results suggest that filler particles or bound rubber domains were agglomerated to form a network structure; this leads to an increase in a peak stress during a start-up flow and a drop of the extrudate quality, especially in the case of silica-filled compounds. A new method was developed for the evaluation of extrudate roughness by using optical microscopy combined with image analysis. A good correlation was found between the yield stress as measured with the sandwich viscometer, and the peak stress measured on the Mooney viscometer in a low-shear-rate start-up flow (i.e., Mooney peak). In addition, there is good correlation between the Mooney peak and extrudate roughness. Based on rheology and the measured fraction of bound rubber, a physical model for the morphology of filler-rubber structures was proposed, wherein the strength members of an open-cell sponge-like structure comprise filler particles and bound rubber. A mechanism for extrudate distortion was suggested. Moreover, we found that it is possible to improve the processability and increase the storage stability of silica-filled tire tread compositions by using small amounts of certain low-molecular-weight epoxides as additives. In addition, a rheological model for silica-filled uncured rubber compounds was proposed.
机译：获得既具有低滚动阻力又具有高湿牵引力的轮胎的一种方法是在胎面中使用沉淀的二氧化硅以及溶液聚合物（而不是乳液聚合物）和硅烷偶联剂。但是，与填充炭黑的胎面相比，二氧化硅化合物的使用在原材料成本和可加工性（硫化之前）方面具有相当大的缺点。因此，可加工性的改善，特别是未储存的未填充二氧化硅的橡胶原料的加工性的改善是重要的问题。这项研究的目的之一是建议用于二氧化硅填充轮胎胎面胶的新型添加剂，这种添加剂可延缓可加工性的下降，同时保持硫化橡胶的机械性能。为了达到这个目的，我们提高了对未固化填充弹性体的储存现象及其对流变性和可加工性的影响的理解。表征了储存温度和储存时间对模型轮胎胶料流变性能的影响。结果表明，填料颗粒或结合的橡胶区域团聚形成网络结构。这会导致在启动过程中峰值应力增加，挤出物质量下降，尤其是在填充二氧化硅的化合物的情况下。开发了一种通过光学显微镜结合图像分析来评估挤出物粗糙度的新方法。发现在夹心粘度计上测得的屈服应力与在低剪切速率启动流中在门尼粘度计上测得的峰值应力之间有良好的相关性（即门尼峰）。另外，门尼峰与挤出物粗糙度之间具有良好的相关性。基于流变学和结合橡胶的测量分数，提出了一种填充橡胶结构形态的物理模型，其中开孔海绵状结构的强度成员包括填充颗粒和结合橡胶。提出了挤出物变形的机制。此外，我们发现通过使用少量的某些低分子量环氧化物作为添加剂，可以改善可填充二氧化硅的轮胎胎面组合物的​​加工性并提高其储存稳定性。另外，提出了二氧化硅填充的未硫化橡胶混合物的流变模型。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号