Abstract:

The surface of silica was physically modified with natural astaxanthin and composited with natural rubber. The structure and properties of natural astaxanthin-modified silica/natural rubber composites were characterized by RPA, DMA and SEM. The results showed that compared with the modified silica without natural astaxanthin in the vulcanization characteristics, the scorch time and the positive vulcanization time of the rubber obtained by using natural astaxanthin-modified silica were shortened, which promoted the vulcanization process of rubber. In terms of physical and mechanical properties, the tensile strength of the obtained vulcanizate was substantially unchanged, the resilience and abrasion resistance were significantly increased and the compression heat generation was lowered. In terms of dynamic viscoelasticity, the Payne effect of the obtained vulcanizate was significantly reduced and the dispersibility of the filler was improved to some extent. In terms of dynamic mechanical properties, the rolling resistance of the obtained vulcanizate was lowered and the glass transition temperature was increased. In particular, in terms of aging resistance, the heat-resistant air aging performance of the natural astaxanthin-modified silica/natural rubber composite material was remarkably improved.

Key words: natural astaxanthin, natural rubber, polymer processing, mechanical properties, silica, aggregation

摘要：

采用天然虾青素对白炭黑表面进行物理改性，并与天然橡胶（NR）制备成复合材料。利用RPA、DMA、SEM等测试手段对天然虾青素改性白炭黑/天然橡胶复合材料的结构与性能进行表征。结果表明，在硫化特性方面，与未采用天然虾青素改性白炭黑相比，采用天然虾青素改性白炭黑所得胶料的焦烧时间和工艺正硫化时间均缩短，促进了橡胶的硫化过程；在物理力学性能方面，所得硫化胶的拉伸强度基本不变，回弹性和耐磨性明显增加，压缩生热降低；在动态黏弹性方面，所得硫化胶的Payne效应明显降低，填料的分散性在一定程度上得到改善；在动态力学性能方面，所得硫化胶的滚动阻力降低，玻璃化转变温度提高。特别地，在耐老化方面，天然虾青素改性白炭黑/天然橡胶复合材料的耐热空气老化性能明显提高。

关键词: 天然虾青素, 天然橡胶, 聚合物加工, 力学性能, 二氧化硅, 聚集