摘要
提出了一种新的表征陶瓷纤维分散性的方法—以搅拌后料浆中产生陶瓷纤维球的质量比来表征纤维的分散效果,可以快速有效地对纤维的分散效果进行评价。使用机械搅拌对陶瓷纤维进行分散,探讨了搅拌工艺对陶瓷纤维分散性能的影响和陶瓷纤维成球的规律。加入羟丙基甲基纤维素,聚丙烯酰胺等分散剂,研究了不同分散剂的分散效果和机理。实验发现,搅拌不仅对陶瓷纤维有剪切、分散作用,还具有聚集成球的作用。当速度达到400rpm时成球化作用最明显,此时纤维最难分散。随着搅拌时间的增大,陶瓷纤维成球率先变大再减少最后达到一个动态平衡。此后增大搅拌时间对陶瓷纤维的分散并无效果。加入羟丙基甲基纤维素能大大降低陶瓷纤维的聚集现象;加入PAM的纤维料浆具有良好的分散性,当加入量为0.4%时,成球率几乎为0,此时陶瓷纤维分散良好。
A new characterization method of ceramic fiber dispersion was presented to test the amount of ceramic fiber ball to reflect the dispersive property of ceramic fiber. This method can be rapidly and effectively used to evaluate the dispersive property of ceramic fiber. The mechanical stirring was used to disperse ceramic fiber. The effect of stirring on the ceramic fiber dispersion properties and the principle of fiber glomeration was discussed. Hydroxypropyl methyl cellulose and polyacrylamide were added. The dispersive effect and dispersion mechanism of different dispersants were studied. It was found that the effect of stirring is not only shearing and dispersion but also glomeration. When the stirring speed was 400rpm, the effect of glomeration was obvious and it was most difficult to disperse. With the increase of stirring time, the amount of ceramic fiber ball was increased firstly, then decreased, and in the end achieved a dynamic equilibrium. After the equilibrium, the increase in stirring time has no effect on ceramic fiber dispersion. Hydroxypropyl methyl cellulose can greatly reduce the congregation of ceramic fiber; polyacrylamide has a good effect on dispersion of fiber. When the concentration of polyacrylamide is 0.4%, the number of created fiber balls is nearly zero. This showed that the fiber was dispersed well.
出处
《陶瓷学报》
CAS
2008年第4期324-328,共5页
Journal of Ceramics
关键词
陶瓷纤维
陶瓷纤维球
分散
分散剂
ceramic fiber, ceramic fiber ball, dispersion, dispersant
