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Title:: Comparison of intrinsic characteristics and properties of natural rubber from different origins

Author(s):: ZHAO Xin; ZHANG Hao; SUN Quan; JING Yu-long; JIANG Mei-juan; YANG Jing-ting; DU Ming-xin; Shandong Institute of Nonmetallic Materials, Jinan 250031, China

Keywords:: natural rubber; molecular weight and its distribution; nitrogen content; Mooney viscosity; mechanical property; aging resistance

摘要:: 选择国内生产的3种天然橡胶生胶与进口烟片胶进行了分子量及其分布、凝胶含量、氮磷含量、湿强度、门尼黏度、力学性能、耐老化性能等的对比。结果表明，在四种天然橡胶中，进口烟片胶的分子量最高、分布较窄，氮含量也最高，磷含量与凝胶含量适中，湿强度表现最佳，门尼黏度最高，拉伸性能较好，但压缩疲劳生热最高；中国热带农业科学院产品的分子量及其分布适中，凝胶含量最高，湿强度表现较好，门尼黏度最低，扯断伸长率及撕裂强度最高,耐老化性能最好；海南天然橡胶产业集团股份有限公司产品的分子量最低、分布较窄，氮含量较低，磷含量最高，湿强度表现较差，耐老化性能较好，但焦烧时间最短；云南天然橡胶产业集团股份有限公司产品的分子量较高但分布最宽，凝胶含量和氮磷含量均为最低，湿强度表现较差，耐老化性能最差，但焦烧时间最长、压缩疲劳生热最低。

Abstract:: Molecular weight and its distribution, gel content, nitrogen and phosphorus content, wet strength, Mooney viscosity, mechanical properties and aging resistance of three kinds of domestic raw natural rubber were compared with those of imported ribbed smoked sheet. The results showed that among the four kinds of natural rubber, the imported ribbed smoked sheet had the highest molecular weight with a narrower distribution, the highest nitrogen content, moderate phosphorus content and gel content, the best wet strength, the highest Mooney viscosity, and better tensile properties, but the highest compression fatigue heat generation; The product of Chinese Academy of Tropical Agricultural Sciences had moderate molecular weight and its distribution, the highest gel content, better wet strength, the lowest Mooney viscosity, the largest elongation at break and tear strength, and the best aging resistance; The product of Hainan Natural Rubber Industry Group Co Ltd had the lowest molecular weight with a narrower distribution, lower nitrogen content, the highest phosphorus content, poor wet strength, and good aging resistance, but the shortest scorch time. The product of Yunnan Natural Rubber Industry Group Co Ltd had higher molecular weight with the widest distribution, the lowest gel content and nitrogen and phosphorus content, poor wet strength, and the worst aging resistance, but the longest scorch time and the lowest compression fatigue heat generation.