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Register a new userA study of washing-off stage for cotton dyed fabrics by reactive dye and their effect on fastness to wet treatments
دراسة مرحلة الغسيل النهائي للأقمشة القطنية المصبوغة بالأصبغة النشطة و تأثيرها في تحسين الثباتية للمعالجات الرطبة
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زياد سفور( باحث )
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تعتبر الأصبغة النشطة من الأصبغة ذات الاستخدام الواسع على الخامات القطنية . تم تطبيق صباغ نشط على قماش قطني منسوج , ثم تم إجراء غسيل نهائي و ذلك باستخدام الماء و ثلاثة مواد قلوية هي ماءات الأمونيوم و بيكربونات الصوديوم و ماءات الصوديوم كلا على حدة . يهدف الغسيل النهائي إلى إزالة الأصبغة غير المثبتة جيدا على القماش و ذلك لتجنب انحلالها أثناء الغسيل المنزلي مما يؤدي إلى انخفاض الثباتية تجاه الغسيل . تم تثبيت مدة ودرجة حرارة الغسيل النهائي و تغيير تراكيز المواد القلوية المستخدمة و تم تحديد أثر ذلك على ثباتية الصباغة تجاه الغسيل المنزلي . وجد بعض الاختلاف بين هذه المواد القلوية الثلاثة من حيث تأثيرها على الثباتية للغسيل , و كذلك أفضل النتائج بوجود بيكربونات الصوديوم وماءات الصوديوم .
A reactive dye was applied to woven cotton fabric then washed-off using water and three alkaline agents (ammonium hydroxide, sodium bicarbonate, sodium hydroxide). The aim of washing-off is to eliminate of dyes no fixed on fabric to avoid its dissolution during washing what reduces fastness to washing. The duration and temperature of wash-off were fixed, and the concentrations of alkaline agents used were varied, and the effects of these variables on the wash fastness of the dyeing were determined. There was little difference between the three alkaline agents, in terms of the level of wash-fastness achieved. The best result was with sodium bicarbonate and sodium hydroxide
References used
BROADBENT D, 2001 - Basic Principles of Textile Coloration. Society of Dyers and Colorists, UK, 578p
GILES C H, 1957 - Notes for a Laboratory Course in Dyeing. Society of Dyers and Colorists, UK, 92p
PARK J, SHORE J, 2004 - Practical Dyeing. Society of Dyers and Colorists, UK, 200p
ROUETTE H K, 2000 - Encyclopedia of Textile Finishing. Springer, Aachen, 2777p
SHORE J, 1995 - Cellulosics Dyeing. Society of Dyers and Colorists, UK, 396p
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In this study, samples of cotton fabric were dyed using direct dye
by the traditional method as well as using microwave energy at
different energy levels. It was noted that the use of microwave
energy increase the dye exhaustion at the used energy
levels
compared to the traditional method, as well as improving the
fastness to washing and wet rubbing.
In this study , a dyeing process of vat dyes was carried out for
cotton fabrics (100%) at an optimal conditions for material's
concentrations (sodium hydrosolphite , oxidization agent
,alkaline agent) to obtained a reference sample using for
comp
arison with another samples which dyeing at difference
concentrations of materials and different oxidization agent and
conditions of works ( work at close condition or open) , and it
was observed the decrease of fastness's values for the tester
samples against dry and wet rubbing opposite of reference
sample and that due to the difference of concentration of
reducing agent and the weakness of bonds between the dye
and textile because of the difference of oxidization conditions.
In this study a process of dying cotton fabrics 100% was carried out
by direct dye Solophynel GLE Yellow and after that it was treated by
cationic softening agent for improving the fastness to washing and
rubbing for the fabrics which were dyed by
direct dyes .we increased
the molecular weight after absorbing it on the cellulosic fiber and the
result is decreasing the solubility of the dye in water and increasing
the fastness to washing and rubbing . and after that we carried out the washing and friction tests and evaluated the results.
This research is based on the use of different types of mineral
mordants, mineral salts, in the dyeing process using the aqueous
extract of eucalyptus leaves. The used mordants are aluminum
potassium sulphate, copper sulphate, iron sulphate and mi
xtures of
these mordants. Study the effect of these mordants on the dyeing
process.
Print pastes contain thickeners ''thickening agents'' that are often
natural or synthetic polymers. The role of thickeners is
thickening of print paste and making it more viscous to avoid
lateral diffusion and improve finesse of motifs. The aim of
this
paper is to study the effect of type and concentration of
thickeners in print paste (using vat dyes and Two-stage method)
on fastness properties and color yield. Thickeners used usually, in
this method, are sodium alginate, guar gum and starch ether.
Conventional print paste recipe applied in this method give low
fastness to dry and wet rubbing when we print in dark shade. We
used only two thickeners in various concentrations, and then the
fastness to rubbing is evaluated. The viscosity of print pastes is
measured because of its effect on the penetration of the print
paste across the fabric, thus its effect on color yield.
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