STUDIES ON DYEING PROPERTIES OF ACRYLIC FIBER

Abstract

The object of this investigation is to examine the effects of heat-treatment conditions on the dyeing property of acrylic fiber, and also to determine if heat treatments prior to dyeing could be a major cause of shade variations.“Orlon” Acrylic fiber was treated by hot water (100, 110, 120, 130, 140 and 150°C), steam (100, 110, 120, 130, 140 and 150°C) and hot air (100, 120, 140, 160, 180 and 200°C) without tension at various temperatures, and then was dyed with basic dye or disperse dye. Each rate of dyeing was determined.The effects of wet heat treatments on the dyeing property was as follows: The rate of dyeing for basic dye or disperse dye was generally increased. The higher the temperature of treatment was, the more conspicuous this tendency became. The equilibrium adsorption for basic dye did not change conspicuously, but for disperse dye it increased with higher temperature.The effects of dry heat treatments on the dyeing property was negligible compared with that of wet heat treatments.Variations in dyeing property as a result of wet heat treatments may be explained as being probably due to change in the dimensions of amorphous regions, namely to make loose the intermolecular force.On the other hand heat treated “Orlon” Acrylic fibers were divided into three groups (hot water, steam, and hot air) and samples of each group were dyed together in the same dye-bath with untreated standard fiber so that they would compete for an adsorption of the limited quantity of dyestuff. Each color difference (ΔE) and total amount of dye absorbed was determined. It was shown that the temperature of thermal treatment must be carefully controlled to obtain a uniform dyeing.