Effects of processing on the rheology of thixotropic suspensions

✍ Scribed by Thomas H. Simon; H. George DeKay; Gilbert S. Banker

• Publisher: John Wiley and Sons
• Year: 1961
• Tongue: English
• Weight: 526 KB
• Volume: 50
• Category: Article
• ISSN: 0022-3549
• DOI: 10.1002/jps.2600501021

✦ Synopsis

A study was undertaken to evaluate the effects of processing by various types of commercially available dispersion equipment under different conditions of operation on certain rheological parameters of thixotropic suspensions. Two suspending agents, bentonite U. S. P. and Veegum HV were used in the evaluation procedure and four types of dispersion equipment were used, a marine-type impeller mixer, a homogenizer, a colloid mill, and a high shear mixer. The rheological parameters were obtained from flow curves that were automatically plotted by means of a completely instrumented Ferranti-Shirley cone-plate viscometer. The type of dispersion equipment employed and the operating conditions used were related to the rheological parameters of the suspension systems. The rheological parameters evaluated were thixotropic index, yield value, spur value, and plastic viscosity.