| Study on Properties of Powdered NR |
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| DOI： |
| Key Words: powdered NR；NR；property；microstructure |
| Author Name | Affiliation | | JIANG Shi-kuan | Yunnan Institute of Tropical Crops | | ZHANG Gui-mei | Yunnan Institute of Tropical Crops | | ZOU Jian-yun | Yunnan Institute of Tropical Crops | | XU Rong | Yunnan Institute of Tropical Crops | | ZHENG Wen-dai | Yunnan Institute of Tropical Crops |
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| Abstract: |
| The properties of powdered NR(PNR) were investigated，and compared with those of acid coagulated natural rubber (NR-a).The results showed that，compared with NR-a，the ash content，nitrogen content，volatile content，initial plasticity and plasticity retention index of PNR were higher，and the impurity content，acetone soluble content and Mooney viscosity were lower.Compared with NR-a，the PNR mix possessed higher MH，t10，t50 andt90，lowerML，ts1 and ts2，and had a lower curing rate.The tensile strength，the moduli at 300% and 500% elongation of PNR vulcanizate were higher than those of NR-a vulcanizate，but the elongation at break was lower.The optimum addition level of release agent was 2～3 phr. |
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