Low shear viscometry in relation to brushing

Summary The flow of decorative paints should be capable of prediction from a rheological study of the paint. By taking into consideration the loss of solvent from a film during the early drying stages, a good estimation of its flow properties in relatively high film thicknesses can be obtained.Compensation for loss of solvent during drying can be made for arbitrary drying conditions which eliminate much of the complications of testing films under practical conditions. This technique is generally applicable to brushing systems where only loss of solvent is expected to occur during the period of time in which flow takes place, and cannot be applied to systems in which other changes might occur.Factors affecting the rate of change of flow with film thickness have not been studied, although the technique described may be capable of extension in this field.Presented at the Joint Meeting of the British Society of Rheology and Research Association of British Paint, Colour and Varnish Manufacturers at Teddington, April 29, 1964.