粒径分布法测试条件对白炭黑WK分散系数的影响

Effect of Measurement Conditions for Particle Size Distribution Method on WK Dispersion Coefficient of Silica

为了准确测定白炭黑的分散性,将市售白炭黑超声分散后采用激光粒度仪进行分析,研究分散液种类、超声功率、超声时间等对白炭黑WK分散系数的影响。结果表明:随着超声功率的增大和时间的延长,白炭黑WK分散系数开始减小幅度较大,随后变缓;表面性能不同的白炭黑要在不同种类分散液中分散后测试,疏水性白炭黑需要在疏水介质中分散;具有稳定WK分散系数的白炭黑测试条件为超声功率为840 W,超声时间为10 min,系数误差小于10%。

To measure the dispersion of silica accurately, the effect of type and concentration of solutions, ultrasonic power and time in dispersion process on WK dispersion coefficient of silica were studied by laser granularity analyzer after ultrasonic dispersion. The results show that WK dispersion coefficient of silica decreases with the increase of ultrasonic power and time. The dispersion solution should be selected according to the surface property of silica. The hydrophobic silica should choose hydrophobic dispersion solution. The measurement conditions for WK dispersion coefficient of silica include that the ultrasonic power is 840 W,the ultrasonic time is 10 min, and the error of the coefficient is less than10%.