The efficiency of β-cyclodextrin in the post-dyeing removal of hydrolyzed reactive dyes

Reaktivna bojila su skupina bojila koja se najviše upotrebljavaju za bojadisanje celuloznih vlakana. Tijekom postupka bojadisanja ovim bojilima, hidroliza bojila može uzrokovati smanjenje učinkovitosti bojadisanja i otežano ispiranje bojila nakon bojadisanja. Uklanjanje hidroliziranog bojila s materijala postupkom ispiranja je vrlo važno kako bi se postigla dobra svojstva postojanosti obojenja. U ovom radu istraživana je primjena β-ciklodekstrina, nano-tvari sastavljene od 7 D-glukopiranozil jedinica povezanih alfa-(1,4) glikozidnim vezama, čime se pospješuje ispiranje hidroliziranog bojila nakon provedbe bojadisanja. Prema dobivenim rezultatima može se reći da je moguća primjena β-ciklodekstrina u ispiranju nakon bojadisanja reaktivnim bojilima za bojila koja s njima stvaraju (inclusion) komplekse.Reactive dyes are the most commonly used dye class in cellulosic fibers dyeing. But during dyeing with these dyes, the hydrolyzation of dye may decrease dyeing efficiency and may cause the washing treatments after dyeing to be much harder. It is very important to remove hydrolyzed reactive dye from the textile material by washing treatments to obtain the desired fastness properties. In this research, usage possibilities of β-cyclodextrins, that are nano-substances structurally consist of 7 D-glucopyranosyl units connected by alpha-(1,4) glycosidic linkages, to enhance hydrolyzed reactive dye in washing treatments after reactive dyeing were investigated. According to the experimental results, it can be said that usage of β-cyclodextrins is possible in washing treatments after reactive dyeing for dyes which form inclusion complex with it

The efficiency of β-cyclodextrin in the post-dyeing removal of hydrolyzed reactive dyes

Reaktivna bojila su skupina bojila koja se najviše upotrebljavaju za bojadisanje celuloznih vlakana. Tijekom postupka bojadisanja ovim bojilima, hidroliza bojila može uzrokovati smanjenje učinkovitosti bojadisanja i otežano ispiranje bojila nakon bojadisanja. Uklanjanje hidroliziranog bojila s materijala postupkom ispiranja je vrlo važno kako bi se postigla dobra svojstva postojanosti obojenja. U ovom radu istraživana je primjena β-ciklodekstrina, nano-tvari sastavljene od 7 D-glukopiranozil jedinica povezanih alfa-(1,4) glikozidnim vezama, čime se pospješuje ispiranje hidroliziranog bojila nakon provedbe bojadisanja. Prema dobivenim rezultatima može se reći da je moguća primjena β-ciklodekstrina u ispiranju nakon bojadisanja reaktivnim bojilima za bojila koja s njima stvaraju (inclusion) komplekse.Reactive dyes are the most commonly used dye class in cellulosic fibers dyeing. But during dyeing with these dyes, the hydrolyzation of dye may decrease dyeing efficiency and may cause the washing treatments after dyeing to be much harder. It is very important to remove hydrolyzed reactive dye from the textile material by washing treatments to obtain the desired fastness properties. In this research, usage possibilities of β-cyclodextrins, that are nano-substances structurally consist of 7 D-glucopyranosyl units connected by alpha-(1,4) glycosidic linkages, to enhance hydrolyzed reactive dye in washing treatments after reactive dyeing were investigated. According to the experimental results, it can be said that usage of β-cyclodextrins is possible in washing treatments after reactive dyeing for dyes which form inclusion complex with it

Low Temperature Dyeing of Plasma Treated Luxury Fibres. Part I: Results for Mohair (Angora Goat)

WOS: 000288917600016This study focused on the usage of plasma treatment for the modification of fibre surfaces to achieve the dyeing of mohair fibres at lower temperatures without causing a decrease in dye-exhaustion. The study was carried out using different gases under various powers and times. The effect was assessed in terms of colour, and the test samples were also evaluated using scanning electron microscopy (SEM). The optimum conditions of plasma treatment for improving mohair fibre dyeability are treatments carried out using Ar gas at 140 W for 60". According to the results of the experiments, it can be concluded that plasma treated mohair fibres can be dyed at lower temperatures (90 degrees C) and for shorter times (1 h instead of 1.5 h) with reactive dye without causing any decrease in colour yield. Dyeing kinetics were also researched in the study, and it was demonstrated that the rate constant and standard affinity of the plasma treated sample increased

Effect of the ozonation process on the dyeability of mohair fibres

WOS: 000290539500003This work has focused on the use of ozonation in order to improve the dyeability of mohair fibres. The study was carried out using a known concentration of ozone and involved process parameters such as wet pick-up, level of pH and treatment time. The effect of fibre ozonation was assessed in terms of colour, and test samples were also evaluated using scanning electron microscopy and Fourier transform-infrared spectroscopy. The optimum conditions of the ozonation process were determined as 60% wet pick-up, pH 7 and 30 min. According to the experimental results, it can be concluded that ozonated mohair fibres can be dyed both at 90 and 80 degrees C with all dye classes without causing any decrease in colour yield. Dyeing kinetics and thermodynamics were also studied and it was demonstrated that the rate constant and the standard affinity of the ozonated sample increased

Ultrasonic Assisted Dyeing of Angora Fibre

WOS: 000384960400021In this study it was aimed to determine the effect of ultrasound usage on the colour yield in dyeing angora fibres, and it was found that dyeing in the presence of ultrasound energy increases the dye-uptake of angora fibres, hence higher colour yield values were obtained. According to experimental results, it can be said that at all points the colour yield values were higher in the presence of ultrasound than in its absence. The difference between them was greater for darker shades and for dyeing carried out in an acidic medium (pH 5), and also for moderate dyeing periods (90 min). Furthermore there is no important difference between washing fastness, alkali solubility and strength values of fibres dyed in the presence and absence of ultrasound

The effect of the usage of fiber protecting agent and dye class on the damage of Angora fibers occurred during dyeing process

WOS: 000294657700009Angora fiber's properties are affected adversely when dyed for prolonged periods at the boiling temperature, and to preserve its luster, one of the alternatives is to use a fiber protecting agents in dyeing. This study has focused on the use of fiber protecting agent to preserve Angora fiber during dyeing treatments carried out at boiling point. Furthermore the effect of dye class on fiber damage during dyeing was also determined. According to the experimental results, in dyeing process at 100 degrees C by adding fiber protecting agent into the liquor degree of fiber damage decreases and reaches to damage value of fiber dyed at 80 degrees C. Furthermore, it can be concluded that bifunctional reactive dye usage is advantageous for the aim of fiber protecting during dyeing

Effects of warp-weft density variation and fabric porosity of the cotton fabrics on their colour in reactive dyeing

WOS: 000246527800018One of the main problems in dyehouses is caused by the differences between the structural parameters of the reference fabric of which the dyeing recipe is known and the fabric to be dyed. In such a case, knowledge of the effects of the parameters such as warp and weft density and fabric porosity on the colour efficiency is of great importance for 'right first-time' dyeing. Cotton fabrics with different warp & weft densities and porosities were dyed with reactive dyes, and the colour measurements were carried out with a spectral photometer. Warp & weft densities and porosity do not have any evident effect on the colour shade, although a considerable change in colour yield was determined

Zastosowanie modyfikacji chemicznej w celu skrócenia czasu parowania podczas drukowania tkanin wykonanych z mieszanki nylon/elastan

Nylon fibres are commonly used in blends with elastane. One of the problems encountered in the printing of nylon/elastane blend fabrics is the necessity of long steaming times for fixation, which causes an increase in energy consumption. In this study, the possibility of printing polyamide fabrics with 1:2 metal complex dyes for short steaming times was investigated. For this aim, laboratory and sample scale trials were performed to develop a method of chemically modifying fibres so that polyamide fabrics can be printed in short steaming times. Based on the results obtained in both trials, it was noticed that the steaming time for fixation could be reduced from 30 minutes to 15 minutes by printing with 1:2 metal complex dyes without causing a loss of printing yield and without affecting the fastness adversly in case of applying cationisation pretreatment with a modified quaternary polyalkylamine compound based product.Włókna nylonowe są powszechnie stosowane w mieszankach z elastanem. Jednym z problemów napotykanych przy drukowaniu tkanin z mieszanki nylon/elastan są długie czasy parowania podczas drukowania, które powodują wzrost zużycia energii. W pracy zbadano możliwość drukowania na tkaninach poliamidowych barwnikami metalokompleksowymi 1:2 dla krótkich czasów parowania. W tym celu przeprowadzono próby laboratoryjne i produkcyjne. Opracowano metodę modyfikacji chemicznej włókien, tak aby tkaniny poliamidowe mogły być drukowane w krótkim czasie parowania. Na podstawie wyników uzyskanych w obu próbach zauważono, że czas naparowywania, utrwalania można skrócić z 30 do 15 minut. Pożądany efekt uzyskano drukując z użyciem barwników metalokompleksowych 1:2 z zastosowaniem obróbki wstępnej kationizacyjnej produktem na bazie modyfikowanego czwartorzędowego związku polialkiloaminy. Skrócenie czasu parowania nie powoduje utraty wydajności drukowania i nie ma negatywnego wpływu na trwałość druku