Abstract：In order to find the silane coupling agents with good modification effect to the white carbon black recycled from the optical fiber preform waste, the modification was studied by using10 kinds of silane coupling agent such as KH-151, KH-171,KH-172 and CG-551. The modification processes are as follows:the white carbon black was activated under the condition of temperature 140 ℃ for 20 h, then 3 g white carbon black and0.3 m L coupling agent was heated in 45 m L xylene under 130℃for 13 h, after centrifugation, the solid sample was washed by using the right amount of anhydrous ethanol, and the modified white carbon black was gotten after the sample was dried. By comparing the test results of the sedimentation, the lipophilic degree and the surface hydroxyl number, it is shown that 10 kinds of silane coupling agents can all modify the white carbon black,and the modification effects of KH-560, CG-8030, KH-8030,KH-171, KH-172, KH-570 are better than that of silane coupling agents(KH-602, KH-792, CG-551, KH-550)containing amino or sulfhydryl group.

Keywords: silane coupling agent; modification; white carbon black; optical fiber preform waste