| Properties of Different Constant Viscosity NR with Low Viscosity |
| Received:August 15, 2018 Revised:August 15, 2018 |
| DOI：10.12136/j.issn.1000-890X.2019.04.0280 |
| Key Words: constant viscosity NR；natural latex；viscosity stabilizer；Mooney viscosity；storage performance；hydroxylamine hydrochloride；hydroxylammonium sulphate |
| Author Name | Affiliation | E-mail | | ZHANG Guimei | Yunnan Institute of Tropical Crops,666100 Jinghong,China | zgm1027@163.com | | JIANG Shikuan | Yunnan Institute of Tropical Crops,666100 Jinghong,China | | | YAN Li | Yunnan Institute of Tropical Crops,666100 Jinghong,China | | | XU Rong | Yunnan Institute of Tropical Crops,666100 Jinghong,China | | | ZOU Jianyun* | Yunnan Institute of Tropical Crops,666100 Jinghong,China | zoujianyunbn@sina.com |
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| Abstract: |
| Several kinds of constant viscosity natural rubber（NR） with low viscosity（NR-HH，NR-HS，NR-SH and NR-MB） were prepared with hydroxylamine hydrochloride，hydroxylammonium sulphate，semicarbazide hydrochloride and accelerator M as viscosity stabilizer，respectively，and their physicochemical properties，storage performance，curing behavior and physical properties were studied. The results showed that，P0 values of NR-HH，NR-HS，NR-SH and NR-MB were lower than that of NR-CK，and PRI of NR-MB was significantly lower compared with that of NR-CK. The curing rate of NR-MB compound was faster than that of NR-CK compound，and the curing rates of NR-HS，NR-HH and NR-SH compound were slower than that of NR-CK compound. The tensile strength and tear strength of NR-HH，NR-HS and NR-SH vulcanizates were equivalent and all worse than those of NR-CK vulcanizate，but the tensile strength and tear strength of NR-MB vulcanizate were higher than those of NR-CK vulcanizate，respectively. All these viscosity stabilizers could effectively decrease the Mooney viscosity of NR and improve the hot air aging resistance. Among them，hydroxylamine hydrochloride and hydroxylammonium sulphate showed a better effect on the stabilization of NR viscosity. |
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