engleski

The study of esterquat adsorption on cotton and polyester/cotton fabrics

Esterquat-based softeners belong to the group of cationic surfactants, which are presently gaining importance due to their functionality and environmental benefits. The work explores their adsorption affinity for the fabrics of cotton and cotton blends with polyester. Considering the importance of the substrate surface, adsorption preceding characterisation of fabric surface charge depending on the pH of the electrolyte solution in the concentration of 0.001 mol/l have been determined. Electrokinetic behaviour of the fabric in adjustable cell is evaluated by the streaming potential method in the SurPASS device. This method is subsequently applied to study the adsorption of esterquats on the fabrics, as well as to monitor their desorption. In the final stage, the adsorption of esterquats is conducted technologically through the exhaustion process at 20 °C for 15 minutes. Adsorption of softeners is evaluated by electrokinetic and technological indicators. Streaming potential measured, depending on the amount of gradually added softener, is indicated as a fabric point of zero charge (PZC) and as the stability of the adsorbed softener through desorption process. Measuring spectral characteristics of softened fabrics, subsequently dyed with Bromo Phenol Blue, is certain uniformity of adsorbed fabric softener. Results have confirmed a significant impact of the fabric surface charge on the adsorption of esterquat on cotton and polyester/cotton fabrics. The appropriateness of electrokinetic measurements prior to the implementation of adsorption through exhaustion process has been confirmed.

softeners; esterquats; adsorption; cotton; zeta potential

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