颜料悬浮液高剪切流变性的研究

Study on High Shear Rheology of Pigment Slurry

采用毛细管黏度计研究了颜料悬浮液高剪切流变性的影响因素。结果表明,碱和分散剂的用量超过最佳用量能明显提高低剪切黏度,但并没有恶化高剪切流变性能。pH值变化对高剪切黏度影响不明显;提高分散剂用量能有效改善颜料悬浮液的高剪切流变性。相同固含量下,粗重钙(<2gm,66%)的高剪切流变性明显好于细重钙(<2μm,95%～96%),而高光重钙(<2gm,99%)最优。浆状重钙经过静置后,尽管低剪切黏度明显上升,但高剪切流变性能基本保持不变。

High shear rheology of pigment slurry was studied by using the capillary viscometer.The results showed that the high shear rheology of pigment slurry is not deteriorated,even though the low shear viscosity increases significantly when the dosages of alkali and dispersant are higher than the optimal ones.There is no obvious effect of pH value on high shear viscosity of pigment slurry.When the dosage of dispersant is close to the optimal one,the increase of dosage can notablely decrease the high shear rheolog...