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Changes in the Specific Charge Amount on the Surface of Cotton Fibres during the Alkali Pre-treatment Process

Research and development

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Nr DOI: 10.5604/01.3001.0013.1817

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Abstract:

The aim of the pre-treatment process is to prepare cotton fabrics for subsequent technological operations, which are, in the majority, carried out in aqueous solutions. The pre-treatment processes modify, to some extent, the properties of cotton, resulting in a significant change in their zeta potential, the amount of specific surface charge or free energy surface. This study makes an assessment of the effect of the alkali pre-treatment process on changes in the amount of negative specific charges on cotton knitted surfaces, known as cationic demand. A “back-titration” method with the use of a Muetek PCD device was adopted for these experiments. It was found that the conventional process of alkali treatment of raw cotton knitted fabrics using sodium hydroxide in the presence of non-ionic surfactant reduced by nearly 50% the amount of negative specific surface charge. Also, changes in weight loss and improvements in the whiteness index, as well as the wettability of alkali pre-treated cotton knitwear, were observed.

Tags:

cotton, alkali pre-treatment, specific charge on cotton surface, cationic demand.

Citation:

Prus S, Kulpinski P, Matyjas-Zgondek E. Changes in the Specific Charge Amount on the Surface of Cotton Fibres during the Alkali Pre-treatment Process. FIBRES & TEXTILES in Eastern Europe 2019; 27, 4(136): 30-37. DOI: 10.5604/01.3001.0013.1817

Published in issue no 4 (136) / 2019, pages 30–37.

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