海胆状钴蓝色料的形成机理及其悬浮性能研究

Study on Formation Mechanism and Suspension Performance of Urchin-like CoAl2O4 Pigment

研究了超细海胆状钴蓝色料的形成机理及其悬浮稳定性。结果表明:在水热条件下,盐溶液在微乳液中的球形水核中完成沉淀反应,生成的纳米片状晶粒相互交织形成类球形颗粒。纳米片状晶粒在水热处理过程中不断收缩,最终形成海胆状前驱体。水热熟化提高了纳米片状晶粒间的结合力,因此水热时间大于5 h时,色料才仍保持海胆状结构。超细海胆状钴蓝色料具有较大的比表面积(54.36 m2/g),表现出优异的悬浮稳定性。

In this paper, the formation mechanism and suspension stability of ultrafine urchin-like CoAl2O4 pigment were studied. The results show that the salt solution completes the precipitation reaction in the spherical water core in the microemulsion under hydrothermal treatment. Meanwhile, the resulting nanoflaky grains interweave to form spherical particles. The nano-flaky grains shrink continuously during hydrothermal treatment process, and form urchin-like precursor in finally. Hydrothermal aging would improve the bonding force between the nano-flaky grains. Therefore, the pigment still maintains the urchin-like structure only when the hydrothermal time is more than 5 h. The obtained ultrafine urchin-like CoAl2O4 pigment exhibits excellent suspension stability due to it has a large specific surface area(54.36 m2/g).