论文部分内容阅读
丁苯橡胶(SBR)脱硫再生是一个挑战,因为聚合物的断链倾向于重排。这影响了回收橡胶的性能,也降低了再生橡胶的质量。在这项研究中,我们在不同的条件下将硫磺硫化SBR再生:脱硫的温度范围是180℃~300℃,试验是在空气和用氮气排除氧气的空气中进行的。根据所用的参数,溶胶分数就像预期的那样增加,交联密度先减小,当温度达到230℃时又开始增加。交联密度增加的原因是不受控制的,降解和氧化反应能使断链链段的分子重排。在热处理过程中防止氧化降低重排能够改善再生SBR的物性。
SBR desulfurization regeneration is a challenge because polymer chain scission tends to rearrange. This affects the performance of the recycled rubber and also reduces the quality of the recycled rubber. In this study, we regenerated sulfur-cured SBR under different conditions: the desulfurization temperature ranged from 180 ° C to 300 ° C. The tests were run in air and air with oxygen exclusion. Depending on the parameters used, the sol fraction increases as expected, the crosslink density first decreases, and then begins to increase again when the temperature reaches 230 ° C. The reason for the increase in crosslinking density is uncontrolled. Degradation and oxidation reactions can rearrange molecular rearrangement of the fragmented chain segment. Preventing oxidation during heat treatment Reducing rearrangement can improve the properties of regenerated SBR.