摘要
研究了Si69在天然橡胶(NR)的低温长时间硫化配方中对硫化胶硫化特性和力学性能的影响。结果表明:在不同的硫化温度下,随Si69用量的增加,硫化曲线平坦,返原率降低。在140℃正硫化时,硫化胶拉伸强度、定伸应力及撕裂强度较高。在145℃过硫化时,硫化胶力学性能及其保持率较高。当Si69用量为2.0份时,NR硫化胶综合性能较好。在不同硫化温度下,随硫化时间延长,NR硫化胶横向松弛时间缩短,交联密度提高。DMA结果表明,加入Si69后NR硫化胶的Tg升高。
The curing characteristics and mechanical and dynamic properties of Si69 in NR compounds by long time curing at low temperature were studied. The results indicated that the optimum curing time was lengthened and the reversion rate was decreased by adding Si69. The properties of tensile strength,modulus and tear strength were higher in optimum curing time at 140 ℃ and NR vulcanizates had better mechanical properties with Si69 2.0 phr. The mechanical properties and conservation rates were higher when long time cured in 145℃. The spin-lattice relaxation time （T2） was shortened and the crosslinking densities were increased with curing time lengthened at different curing tempera- tures. DMA results showed that Tg moved to higher temperature after adding Si69.
出处
《弹性体》
CAS
北大核心
2009年第2期50-54,共5页
China Elastomerics
关键词
SI69
NR
硫化特性
力学性能
交联密度
Si69
NR
curing characteristics
mechanical properties
crosslinking densities
