Table of Contents
What are the types of reactive dyes?
Classification of Reactive Dyes
- Halogen. Triazine group:procion,cibacron. pyrimidine group:reactone. Quinoxaline group:Levafix.
- Activated vinyl compound: Vinyl sulphone:remazol. Vinyl acrylamide: primazine. Vinyl sulphonamide: levafix.
Which of the following is reactive dye?
By reactive dyes the following fibres can be dyed successfully: Cotton, rayon, flax and other cellulosic fibres. Polyamide and wool fibres….Reactive Dyes: Classification, Dyeing Mechanism, Application & Stripping.
| Trade name | Manufacturer | Country |
|---|---|---|
| Ciba cron | Ciba | Switzerland |
| Remazol | Hoechst | Germany |
| Levafix | Bayer | Germany |
| Reactone | Geigy | Switzerland |
What are the 3 types of dyes?
- Synthetic Dye. All the dyes that are derived from organic and inorganic chemical compounds are synthetic dyes.
- Direct Dye. These dyes are applied to the fabric by preparing an aqueous solution and submerging the fabric in it.
- Disperse Dye.
- Reactive Dye.
Why is it called reactive dye?
The term reactive signifies that the dyes react rapidly with an inert fiber like cotton and produces co-valent bond formation with an excellent color fastness. So, this dye stuff is called reactive dye.
How many types are there in dyestuff for reactive dye?
Various types of reactive dyes are used in dyeing industry. Here I have discussed 17 types of reactive dyes with properties, structures, influencing factors like, temperatures, solubility, and fixation process.
What are the characteristics of reactive dyes?
Properties of reactive dyes:
- Reactive dye is anionic in nature.
- Reactive dye is a water soluble dye.
- They have better wash and light fastness properties.
- They have better substantivity.
- They form strong co-valent bond with the cellulosic fiber.
- Alkaline condition is must required for dyeing.
What are reactive dyes made of?
* like other environmentally damaging dyes, reactive dyes are made from synthetic petrochemicals. * the process requires very high concentrations of salt (0\%-80\% of the weight of the goods dyed), alkali and water.
Are azo dyes reactive?
Azo dyes account for 60 to 70\% of all textile dyestuffs produced and are the most common chromophore of reactive textile dyes. Colouration of textile effluents usually can be linked to the presence of water-soluble (reactive) azo dyes.
What are dyes examples?
Acid dyes are water-soluble anionic dyes that are applied to fibers such as silk, wool, nylon and modified acrylic fibers using neutral to acid dye baths….Basic Dyes.
| Basic Dyes | Acidic Dyes |
|---|---|
| Safranin | Eosin |
| Basic Fuchsin | Acid Fuchsin |
| Crystal violet | Congo Red |
| Methylene Blue |
What is reactive dyeing in textile?
Reactive dye is the dye that can react with a fibre to form a covalent link, that is forming a permanent attachment in the fibre and could not be removed by repeated treatment with boiling water under neutral conditions. Consequently, the dyes become parts of the fibre, leading to outstanding colour fastness to wash.
Where are reactive dyes used?
Reactive dyes have a wide color range and are mostly used for printing cellulosic fibers such as cotton and linen. In reactive dye printing, dye molecules are diffused into the fibers and establish chemical bonds with them after fixation occurs.
What are reactive dyes in textiles?
reactive dye, any of a class of highly coloured organic substances, primarily used for tinting textiles, that attach themselves to their substrates by a chemical reaction that forms a covalent bond between the molecule of dye and that of the fibre.
What is re-reactive dye?
Reactive dyes are so-called because this is the only type of dye that has a reactive group. This group reacts chemically with the fiber polymer molecules to form covalent bonds. This covalent bond is formed between the reactive group and terminal –OH group of cellulosic fibers and terminal –NH 2 group of polyamide and wool fiber.
What are the factors affecting the performance of rereactive dyes?
Reactive dyes have good perspiration fastness with rating 4-5. pH – Strong alkaline pH is required ranging from 10.5-11.2. Temperature – Dyeing temperature depends on the brand of dye used. Concentration of electrolyte – The depth of shade is the determining factor of electrolyte concentration.
What is the difference between medium brand reactive and low brand reactive?
Medium brand reactive dyes: This type of dyes is applied in a medium temperature range is 40 – 60 degree Celsius. Their reactivity is medium with fiber. III. Low brand reactive dyes: This type of dyes has very low reactivity properties with fiber with comparison with medium and high brand reactive dyes.
What are the different types of dyes?
Some usual types are: Dyes having –S.SO 3 H groups directly substituted in aromatic nuclei, such as Dykolite (Southern Dyesuff Corporation) and Hydrosol (Casella). Dyes having –S.SO 3 H groups attached to the aromatic nuclei through an alkyl group, usualy –CH 3 such as Inthion dyes (Hochest).