液相臭氧法改性炭黑及分散性能研究

Modification and dispersive performance of carbon black by liquid ozone method

为了提高炭黑在水溶液中的分散性,通过液相臭氧氧化法对炭黑表面进行氧化改性,并利用沉降实验表征炭黑在水溶液中的分散稳定性,同时也利用TEM、纳米粒度与电位分析仪表征改性前后炭黑的分散性及平均粒径。此外,还分别利用傅里叶红外光谱仪、热重分析仪、元素分析仪表征臭氧改性炭黑的表面基团结构及含量、元素组成。结果表明:炭黑经过臭氧改性后,引入了大量的羧基、羟基等酸性含氧官能团,并且在水溶液中的分散性明显提高。在3 500 r/s的离心机中离心60 min时,其透光率为26.1%,而此时原样炭黑分散液的透光率却为96.7%。

In order to improve the dispersion of carbon black in aqueous solution, the carbon black surfaces were modified by ozone oxidation in liquid phase. The dispersion stability of carbon black in aqueous solution was characterized by the sedimentation experiment, and at the same time the dispersion and the average particle size of original and modified carbon blacks were character- ized by TEM, nano particle and potentiometric analyzer. In addition, the surface groups and content, elements of the ozone modified carbon black and the original one were investigated by using Fourier transform infrared spectrometer, thermogravimetric analyzer and element analysis instrument. The results showed that a number of acidity oxygen-containing functional groups such as carboxyl and hydroxyl were introduced on the carbon black after ozone modification, and the dispersion of carbon black in aqueous solution was obviously improved. The dispersion sample was centrifuged at 3 500 r/s in a centrifuge for 60 min, the transmittance was 26.1%, while the transmittance of original carbon black dispersion liquid was 96.7%.