文章摘要
Effect of Anti-reversion Agent KA9188 on Properties of NR Compounds
Received:August 06, 2021  Revised:August 06, 2021
DOI：10.12136/j.issn.1000-890X.2022.12.0915
Key Words: anti-reversion agent；NR；crosslinking density；tensile properties；glass transition temperature
Author NameAffiliationE-mail
WANG Chen AECC Beijing Institute of Aeronautical Materials 15174926151@163.com 
FENG Linzhao AECC Beijing Institute of Aeronautical Materials  
LAI Liangqing AECC Beijing Institute of Aeronautical Materials  
SU Zhengtao* AECC Beijing Institute of Aeronautical Materials zts@263.net 
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Abstract:
      Abstract：The effect of the amounts of anti-reversion agent KA9188 （KA9188 for short ） on the properties of natural rubber（NR） compounds of K and S series formulations with sulfur amounts of 1.2 and 0.5 phr，respectively，was studied. The results showed that the reversion rates of the NR compounds of S series formulations were much lower than those of the NR compounds of K series formulations，indicating that KA9188 could significantly improve the anti-reversion properties of the NR compounds of S series formulations.With the increase of the amounts of KA9188，the crosslinking densities，Shore A hardnesses and moduli of the NR vulcanizates of K and S series formulations increased，the tensile strengths，elongations at break and tear strengths decreased，the loss factors of the vulcanizates at the glass transition temperatures（Tg） increased and the dynamic shear moduli at Tg decreased.Compared with the Tgof the NR vulcanizates of K series formulations，the Tg of the NR vulcanizates of S series formulation had a slightly higher tendency to move to the low temperature direction，because the long methylene chains in the KA9188 molecule provided the NR vulcanizates with slightly better cross-linking network flexibilities than monosulfide bonds and disulfide bonds. The cross-linking densities of the NR vulcanizates of K series formulations were greater than that of the NR vulcanizates of S series formulations.
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