关于印花糊料流变性的测定

Rheometric Test of Printing Thickener

流变特性是印花糊料一个重要的性能 ,直线方程logη=logK +QlogD因粘度和剪切速率的对数之间存在极好的相关性 ,而能正确描述所有印花糊料的这一特性 ,PVI值为这直线方程中斜率的反对数而更为清晰方便地表示这一特性。上述方程作图时 ,粘度和剪切速率应采用双对数坐标 ,粘度测定时要注意因存在结构粘度而出现剪切变稀现象所引起的粘度波动。

Rheological property is one of the major behaviours of printing thickeners. Linear equation logη=logK+QlogD can exactly describe such a behaviour due to its excellent correlation between viscosity and shear rate logarithm, while the value PVI, i.e. antilogarithm of the slope in the linear equation just expresses the behaviour in a more clear_cut and convenient way. In mappping the above equation, log_log plot should be introduced. However, in testing the viscosity, attention should be paid to such factors affecting the rheological property as stock thickener concentration and molecular weight, and viscosity fluctuation caused by shear thinning in structural viscosity.