假塑触变性炭黑水基分散体的制备和胶体性质

Preparation of Thixotropic Water-Based Carbon Black Dispersion and Its Application

考察了采用聚苯乙烯马来酸酐高分子作为分散剂,用三种分散设备制备超细炭黑水基分散体系的研磨过程,然后采用黄原胶对分散体系增稠,测定了增稠后炭黑水基体系的粒径分布、黏度曲线特征和分散稳定性。实验结果表明采用密闭循环式研磨机,炭黑分散体粒径D99可达到2μm以下。粒径分布主要与采用的研磨介质大小有关。0.4 mm的氧化锆珠比0.8 mm的氧化锆珠能够得到更小的粒径分布。增稠后炭黑水基分散体系体现假塑性和触变性黏度。在高速离心加速度为2 300×g条件下离心7 h,分散体系不发生沉降,具有极好的动力学稳定性。

This article has described the preparation process of uhrafine water based carbon black disper- sion with polystyrene/maleic anhydride polymer as dispersant and three dispersing equipments. The disper- sion was thickened with xanthogenic gel, which was tested in terms of its particle size distribution, viscosity and stability. The results showed that the closed cyclic grinding mill enabled the D99 less than 2 μm. The particle size distribution depended on the grinding media, 0.4 mm ZrO2 beads can lead narrower particles size distribution than 0. 8 mm ZrO2 beads. The thickened dispersion showed a thixotropie viscosity. The dis- persion would not settled down by high speed eentrifugation （2 300× g） for 7 h, showing an excellent dy- namic stability.