硫化促进剂NOBS含量测定方法的探讨

Approach of Vulcanizing Accelerator NOBS's Assaying Method

硫化促进剂NOBS纯度的测定方法有三种:电位滴定法、指示剂滴定法和液相色谱法。电位滴定法比批示剂滴定法测得结果高0．42％,高效液相色谱法比电位滴定法测得结果高0．39％。通过对硫化促进剂NOBS三种测定方法优缺点的比较,阐明了修订后的GB／T8829纯度测定采用电位滴定法的原因。

There are three purity measuring methods of vulcanizing accelerator NOBS ： potentiometric titration, indicator titration and liquid chromatography. The result of potentiometric titration is 0.42% more than indicator titration＇s. The result of HPLC is 0.39% more than potentiometric titration＇s. Through the comparison of the three measuring methods of vulcanizing accelerator NOBS , the reason of adopted potentiometric titration in the revised GB/T8829 is illuminated.