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.
In this research, we did the optical spectral study for using
ultrasound energy in dyeing wool fibers using acid dyes. That we
dyed wool fibers using both traditional dyeing and ultrasound
techniques by using three acid dyes from different firms.
The results of exhaustion percentage of the dye had been compared "the total moving dyes from a solution to fibers after dyeing".
The exhaustion rate of some dyes increased by a large proportion
but the effect on the fastness of the light, rubbing and washing was not great.
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.
During the past few years attention has been drawn on chemical techniques
that could be used to discolour textile wastewaters. We have studied the
photocatalytic degradation of various dyes (Methyl orange, Azo carmine B,
Coomassie Brilliant blue G
250, Tartrazine, Calcon, Eriochrome blue SE,
Solamine Red 4BL, Bismarck brown Y(G), Methylen blue, Black 5, Red 120,
Morin) using TiO2 P25 Degussa as catalyst. All dye solutions underwent a
decolourization. The kinetics of reaction have been studied and were found to
be zero or first order with respect to the dye. It was compared with the
adsorption properties. The effect of the addition of hydrogen peroxide has been
studied. An enhancement of the rate has been observed in all cases and the
order with respect to the dye's concentration in presence of the additive seemed
not to change. It is difficult to give general view of the kinetics using these very
different dyes but the process was found to be effective for the decolourization
of textile wastewater.
