color dye that dissolves in organic solvents, creating a solution. The ability to mix
with solvents is due to the non-polar nature of the dye chemicals. This class of
colorings is used in a range of products including ink, plastics, and resins. Within
the class of solvent dyes, there are other types of dyes that relate to specific
colors, such as red or yellow and green or blue.
Chemicals that can easily dissolve in other chemicals and form a solution are
called solvents. They cannot, however, be dissolved in water. These dyes are
completely soluble in organic solvents, which means they will not form a separate
layer or residue. The ability of the dye to completely dissolve is important to
achieve a consistent color.
Unlike other colorings, Solvent Red Dyes do not easily ionize. Ionization refers to a
compound's ability to change polarity by gaining or losing an electron from
another compound. This function is why solvent dyes do not dissolve in water, a
highly polar substance. This dye class tends to be made of aromatic, colored
compounds that easily dissolve. The naming system for these dyes use a color index,
following a classification system: solvent + color + number; solvent blue 35. This
system is based strictly on color, and not the chemicals used in each of the
different dyes.
The chemical activity of these colorings are important as they can dissolve in
non-polar chemicals. Common non-polar compounds are oils, fats and fuels. Solvent
dyes are used extensively to color plastics. Other uses include coloring resins, wood
stains and waxes. The color in pen inks, candles and printing ink are made of these
colored dyes.
There are scientific uses for these dyes, as they are used in solutions that
stain the different structures found in cells. These stains are used in research as
well as medical diagnostics. Dyes can even be customized for specific processes.
Solvent Yellow
Dyes are also known as azo dyes. These are synthetic and contain a nitrogen
double bonded to another nitrogen. This is known as an azo group. As many as 70
percent of all textile and food dyes are azo colors.
Green and blue dyes are commonly known as anthraquinone dyes. Anthraquinones are
chemicals that have the molecular structure containing 14 carbons, eight hydrogens
and two oxygens. By adding an amino group of hydroxyl group to the basic structure, a
range of colors is created.
Metal Complex Dyes are
premetallised dyes that show great affinity towards protein fibers. In this dye one
or two dye molecules are coordinated with a metal ion. The dye molecule is typically
a monoazo structure containing additional groups such as hydroxyl, carboxyl or amino,
which are capable of forming a strong co-ordination complexes with transition metal
ions such as chromium, cobalt, nickel and copper.
Metal Complex Red Dyes belong to numerous application classes of dyes. For
example, they are found among direct, acid, and reactive dyes. When applied in the
dyeing processes, metal-complex dyes are used in pH conditions that are regulated by
user class and the type of fiber type (wool, polyamide, etc).
Basic Dyes and its
application in dyeing and printing process are interesting. Jute fiber and its
generated products are treated with basic dyes. I have written about the jute fabric
printing with basic dyes in one of my blog post. I think that's will help you to
know about the printing process of basic dyes.
Basic dyes are called cationic dyes because when salts of organic bases are
ionize into an-ionic and cationic part that's time cation is the responsible for
color production. On the otherhand basic dyes are basically hydro-chloride or salts
of organic bases. Generally they are in-soluble in water but it becomes in soluble
form when treated with alcohol or methyl-ated spirit. Basic dyes dyeing are carried
out in acidic form. Dyeing process for different fibers are varies.
Many new dyers are often nervous about
Acid Dyes when they first hear of
them; they think the dyes themselves are harsh flesh eating caustic acids. In reality
the acid dyes available to the home dyer are non-caustic and very safe to use. A few
are even safe enough to eat - such as those sold as food coloring or used in popular
drink mixes (please don't eat the dyes). Most broad use "over the
counter" all-purpose dyes, like Rit? and Jacquard's all-purpose iDye, have
an acid dye component included to dye protein fibers. When home dyeing, Acid Dyes
should, of course, be handled with the normal care that you would handle any
concentrated powdered dye or craft chemical, which is wear a dust mask when mixing
the powders, wear gloves, use good housekeeping procedures, you know the drill.
Direct Dyes are defined as
anionic dyes with substantivity for cellulosic fibres, normally applied from an
aqueous dyebath containing an electrolyte, either sodium chloride (NaCl) or sodium
sulfate (Na2SO4). The dyeing process with direct dyes is very simple, Direct dyeing
is normally carried out in a neutral or slight alkaline dyebath, at or near boiling
point, but a separate after treatment such as cationic dye fixing, to enhance wet
fastness has been necessary for most direct dyeing.
Chemically they are salts of complex sulfonic acids. More than 75% of all
direct dyes are unmetallised azo structures, great majority of them are disazo or
polyazo types. Their ionic nature is anionic and are soluble in water. They have an
affinity for a wide variety of fibers such as cotton, viscose, silk jute, linen etc.
They do not make any permanent chemical bond with the cellulosic fibers but are
attached to it via very week hydrogen bonding as well as vander waals forces. Their
flat shape and their length enable them to lie along-side cellulose fibers and
maximize the Van-der-Waals, dipole and hydrogen bonds.
Vat Dyes, which include
indigo and anthraquinone-based dyes, are chemically complex dyes which are insoluble
in water. They must first be reduced to the leuco form in an alkaline solution of
sodium hydrosulfite before application to the cotton or rayon fiber. Air oxidation
fixes the dye strongly on the fiber, resulting in excellent wash-fastness and light-
fastness. The vat dyes were one of the most significant textile dye inventions in the
20th century.
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