Wyniki wyszukiwania - BazTech

1

Influence of Bleach Activators in Removing Different Soils from Cotton Fabric

Tavčer Petra Forte

Fibres & Textiles in Eastern Europe

|

2020

|

Vol. 28, no. 3 (141)

74--78

EN

The influence of adding Sodium Perborate Tetrahydrate (NaPB) and tetraacetylethylenediamine (TAED) on the efficiency of removing soils from cotton fabric was evaluated in the study. NaPB as inorganic peroxide and TAED as a bleach activator were added to a commercial washing powder agent. Four standard soils applied on cotton fabric (EMPA standard soiled fabrics) were used in the study, i.e. 101 – carbon black/olive oil, 114 – red wine, 116 – blood/milk/ink and 160 – chocolate. The washing of fabrics was conducted in accordance with the SIST EN ISO 105-C06 standard at 40, 60 and 90 °C in Launder-Ometer apparatus. The washing efficiency was evaluated by determining the CIE L* colour coordinates of the unwashed and washed fabric samples, and the difference in ΔL* colour coordinates among them. The results showed that NaPB and TAED improve the efficiency of washing for two standard soils, have no effect on one, and deteriorate the washing results of one standard soil.

PL

W pracy oceniono wpływ dodania tetrahydratu nadboranu sodu (NaPB) i tetraacetyloetylenodiaminy (TAED) na skuteczność usuwania zabrudzeń z tkaniny bawełnianej. NaPB jako nadtlenek nieorganiczny i TAED jako aktywator wybielacza dodano do handlowego proszku do prania. W badaniu wykorzystano cztery standardowe zabrudzenia na tkaninie bawełnianej (standardowe zabrudzone tkaniny EMPA), tj. 101 – sadza/oliwa z oliwek, 114 – czerwone wino, 116 – krew/mleko/tusz i 160 – czekolada. Pranie tkanin przeprowadzono zgodnie z normą SIST EN ISO 105-C06 w 40, 60 i 90 °C w aparacie Launder-Ometer. Wydajność prania oceniano przez określenie współrzędnych kolorów CIE L* niepranych i pranych próbek tkanin oraz różnicy między nimi we współrzędnych kolorów LL*.

2

Kinetics and mechanism of meso-tetraphenylporphyriniron(III) chloride (TPP) catalysed oxidation of indole by sodium perborate

Kungumathilagam D., Karunakaran K.

Polish Journal of Chemical Technology

|

2013

|

Vol. 15, nr 2

107–111

EN

Developing catalyst is very significant for biologically important reactions which yield products, used as drugs. Mechanistic study on meso-tetraphenylporphyriniron(III) chloride (TPP) catalysed oxidation of indole by sodium perborate in aqueous acetic acid medium have been carried out. The reaction follows a fractional order with respect to substrate and catalyst. The order with respect to oxidant was found to be one. Increase in the percentage of acetic acid and increase in the concentration of [H+] decreased the rate. The reaction fails to initiate polymerization, and a radical mechanism is ruled out. Activation and thermodynamic parameters have been computed. A suitable kinetic scheme based on these observations has been proposed. Significant catalytic activity is observed for the reaction system in the presence of TPP.

3

New method of discharge printing on cotton fabrics using horseradish peroxidase

Karthikeyan K., Dhurai B.

Autex Research Journal

|

2011

|

Vol. 11, no. 2

61--65

EN

Textile discharge printing is the most versatile and important of the methods used for introducing design to textile fabrics. In discharge styles, the pattern is produced by the chemical destruction of the original dye in the printed areas. The discharging agents used can be oxidising or reducing agents, acids, alkalis and various salts. However, the most important methods of discharging are based formaldehyde sulphoxylates and thiourea dioxide. Recently, environmental and industrial safety concerns have increased the potential for the use of enzymes in textile processing to ensure eco-friendly production. Formaldehyde sulphoxylate (NaHSO2.CH2O.2H2O) is one of the most powerful discharging agents; however, it is quite toxic and produces formaldehyde, a known human carcinogen associated with nasal sinus cancer and nasopharyngeal cancer. In this work, a hazardous chemical has been replaced with eco-friendly horseradish peroxidase enzyme in textile discharge printing. Enzymatic discharge printing was carried out with a phenol oxidising enzyme system such that the reactive dye was selectively discharged from the cotton fabric in selected areas, creating a printed surface. The effects of enzyme concentration, pH of the printing paste, treatment time and the temperature of enzymatic treatment were studied. The optimum conditions for enzymatic discharge printing were found to be pH 8.5 at 70°C with a dye concentration of 80 g/L and 60 min as the treatment time.

4

Sodium Perborate Usage instead of Hydrogen Peroxide for the Reinforcement of Oxygen Delignification

Pesman E., Kalyoncu E. E., Kirci H.

Fibres & Textiles in Eastern Europe

|

2010

|

Vol. 18, no. 6 (83)

106--109

EN

Oxygen has always been an attractive oxidant for the pulp and paper industry due to it being cheap and harmless for the environment. However, it has lower lignin-cellulose selectivity, therefore the degree of delignification achieved at the oxygen stage is ultimately limited by its industrial pulp strength – 45-50%. In this study, to enhance the degree of delignification, the addition of sodium perborate and hydrogen peroxide at the oxygen stage was examined. At the same active oxygen (approximately 0.5%) content, the degree of delignification increased from 45.56% to 49.42% using hydrogen peroxide and to 52.96% with sodium perborate. For the same selectivity parameter with control, the delignification degree can be increased to 57.59% with the addition of sodium perborate, which includes 1% active oxygen. Moreover, the costs of using sodium perborate and hydrogen peroxide were compared with respect to commercial employability. It was determined that the use of sodium perborate was more effective than that of hydrogen peroxide for delignification of the oxygen stage.

PL

Tlen, od dawna chętnie stosowany oksydant w przemyśle papierniczym wykazuje niższą selektywność w stosunku do lignin, dlatego stopień delignifikacji w fazie tlenowej jest ograniczony właściwościami pulpy. W pracy badano wpływ dodatku nadboranu sodu i nadtlenku wodoru w fazie tlenowej w celu zwiększenie stopnia delignifikacji. Przy stałej zawartości tlenu aktywnego (średnio 0.5%), stopień delignifikacji wzrósł od 45.56% do 49.42% w przypadku nadtlenku wodoru i do 52.96% w przypadku nadboranu sodu. W stosunku do próby kontrolnej stopień delignifikacji wzrasta do 57.59% przy zastosowaniu nadboranu sodu, zawierającego 1% tlenu aktywnego. Ponadto porównano koszty stosowania nadboranu sodu jak i nadtlenku wodoru uwzględniając zastosowanie handlowe. Wykazano większą efektywność delignifikacji w fazie tlenowej przy zastosowaniu nadboranu sodu niż nadtlenku wodoru.