Original scientific paper
Investigation of Bleach Active Compounds in Washing Bath
Tanja Pušić
; Faculty of Textile Technology, University of Zagreb, Zagreb, Croatia
Jasenka Jeličić
; Labud d.o.o., Zagreb, Croatia
Mila Nuber
; Labud d.o.o., Zagreb, Croatia
Abstract
The washing effects of standard EMPA fabric with special soilings, laboratory soiled percale fabric and control RAL fabric have been investigated. Washing with addition of hydrogene peroxide or peracetic acid was performed in the laboratory machine, Lavamac, at 60 and 80˚C. The washing performance of these bleach active compounds was evaluated in the bath composition with nonionic surfactants and sodium hydroxide for regulation of pH. Builders were not added in the laundry bath. Pre-washing was performed in the alkaline bath, pH 9-10 with different additions of enzymes and sodium hypochlorite. It was found that colored soiling such as red pepper chutney, red wine and fruit juices were removed at both temperatures, but more efficiently at the higher temperature. The washing effects with hydrogen peroxide were better than with peractic acid. The protein soiling as cocoa, milk/blood/ink and yolk were efficiently removed at lower washing temperature with enzymes in pre-wash. The effect of non-ionic surfactants was improved with enzymes. Pre-washing with sodium hypochlorite, followed by washing at 80 ˚C after 25 cycles, caused damage to textiles. The chemical wear s and the decrease of tensile strength and depolymerization were higher than the limited values according RAL. The damage of textiles washed at 60 ˚C was not evident. The whiteness degree of textiles after 25 cycles was below the limited value. The whiteness of the brightened fabric was not improved during 3 cycles indicating that the concentration of FBA should be increased or a different type of FBA should be applied.
Keywords
bleach active compounds; washing with hidrogene peroxide; washing with peracetic acid; washing effects
Hrčak ID:
22781
URI
Publication date:
20.10.2007.
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