Rheological characterisation of coating colours -comparison between conventional techniques and a slit die system

摘要

An experimental rheological evaluation of coating colours has been performed. The pigments studied were three kao- lin grades (Brazilian, English and American delaminated clay) and two aragonite grades (precipitated calcium carbonate, PCC). The aspect ratios of the clay pigments ranged from quite low to very high values. Two different grades of thickener (carboxymethyl cel- lulose, CMC) with different molecular weights were also studied.