光棒废料中提取的白炭黑的疏水化改性

Hydrophobic modification of white carbon black obtained from optical fiber preform waste

为找出光纤预制棒废料中提取的白炭黑的改性效果好的硅烷偶联剂,用KH-560、KH-151、KH-171、KH-602和CG-551等10种硅烷偶联剂对该白炭黑进行改性。白炭黑在140℃下活化20 h,将活化的白炭黑3 g分别与10种不同的偶联剂0.3 m L在45 m L二甲苯溶剂中130℃加热搅拌13 h,离心分离后,固体样品加适量的无水乙醇洗涤烘干后即得到改性的白炭黑。改性后样品的沉降性、亲油化度、表面羟基数等实验结果表明,10种硅烷偶联剂都能对白炭黑进行改性,其中KH-560、CG-8030、KH-151、KH-171、KH-172、KH-570对白炭黑的改性效果优于含氨基或巯基的KH-602、KH-792、CG-551、KH-550等。

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 using 10 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 ~C for 20 h, then 3 g white carbon black and 0.3 mL coupling agent was heated in 45 mL xylene under 130~C 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.