What are Azoic dyes used for?
Azo dyes are the most important synthetic colorants which have been widely used in textile, printing, paper manufacturing, etc.
What is Azoic dye process?
Introduction: Azoic dyes are not ready-made dyes but are produced by reaction of two components-Diazocomponent or Base/Salt and Coupling component (Naphthol). Dye formation in Fibre occurs on the basis of coupling reaction.
What is Azoic Colour?
Azoic Color is called Ice Color or magic color because it needs low temperature and after coupling color is produced within a few seconds. Color fastness properties are good to excellent. Azoic Dyes.
What is Azoic dye in textile?
Azo dyes are a type of direct dye – meaning that they color the fibers “directly”, which eliminates the need for a mordant. Azo dyes are one of the main types of dye used by the textile industry. They are known to be potential carcinogens.
Why Azoic dyes are so called?
Why Azo Dye is so called? This color contains insoluble azo groups in its chemical structure. That’s why this color is called Azo color.
Why Azoic Colour is called ice Colour?
Azoic dye is produced by the reaction of coupling component and diazo component. The procedure of producing azoic dye is different from that of producing other dyes. Azoic dye is also called ice color because it needs low temperature after the dye is produced.
Why Azoic colour is called ice colour?
Why azoic dyes are so called?
What is azo group in chemistry?
IUPAC defines azo compounds as: “Derivatives of diazene (diimide), HN=NH, wherein both hydrogens are substituted by hydrocarbyl groups, e.g. PhN=NPh azobenzene or diphenyldiazene.” The more stable derivatives contain two aryl groups. The N=N group is called an azo group.
Why azoic dyes are also known as naphthol dyes?
Napthols are azoic dyes which are largely used in handloom sector to dye cellulosic fibers. They are termed as such because their molecules hold an azo group. Distinguished by their brightness, magnificence and overall fastness features, they help to create some of the vividly colored fabrics.
Which processes are essential for dyeing fabric with Azoic dye?
Dyeing Process of Cotton Fabric with Azoic Dyes
- Naphtholation: Naphthols are insoluble in water and they are converted into water soluble compound by treating with alkali.
- Diazotization:
- Coupling/Developing:
- Naphtholation:
- Base solution (for diazotization):
- Procedure:
Why is azo dye important?
Azo dyes are widely used in textile, fiber, cosmetic, leather, paint and printing industries. Besides their characteristic coloring function, azo compounds are reported as antibacterial, antiviral, antifungal and cytotoxic agents.
Why is Azoic dye called ice color?
Why it is called azo dye?
Why Azo Dye is so called? This color contains insoluble azo groups in its chemical structure. – N=N – Azo group. That’s why this color is called Azo color.
What is azo dye give example?
Azo dye are a large class of synthetic organic dyes, that contain nitrogen as the azo group or −N=N− as a part of their molecular structures. Orange-1 is an example of azo dye.
What is azo dye chemistry?
Azo dyes are organic compounds bearing the functional group R−N=N−R′, in which R and R′ are usually aryl. They are a commercially important family of azo compounds, i.e. compounds containing the linkage C-N=N-C. Azo dyes are widely used to treat textiles, leather articles, and some foods.
What is azo free dye?
Azo-free refers to any dyes that do not contain the main known carcinogenic compounds that have been regulated by the EU. The main countries that dye textiles tend to be in Asia and India and do not have the same strict regulations as in the EU, although legislation is slowing changing.
What is azo paint?
Name given to any of the bright Synthetic Organic Pigments from which fairly permanent pigments are produced for industrial paints, printing inks and varnishes. A few Azo pigments can be used in Artists’ Paints especially Acrylics and some oils but most are too fugitive.
What is azo dye reaction?
Azo dyes are prepared by diazo coupling reaction. It is a reaction in which diazonium ions are coupled with rings of phenol or aromatic amines. It is an electrophilic aromatic substitution reaction in which diazonium ion acts as an electrophile while aromatic compounds act as nucleophiles.
What colors are azo dyes?
Azo dyes are also known as azoic or nepthol dyes. The azo dyes are chiefly of red, brown and yellow colors. The chemicals from which these dyes are manufactured are called fragrant amines. These dyes are not directly applied on the fabrics but, they are constructed within the fibres.