Types of Dyes in Textile Industry | Texhour.com
One of the types of dye is direct dyes and direct Dyes are widely used and most economical of all classes. They are soluble in water and have an affinity for a wide variety of fibers. Good for pastels and light shades, but medium and heavy colors have poor washing and light fastness.
Types of Dyes
According to their chemical properties and solubility, dyes are classified as
• Direct Dyes
• Reactive Dyes
• Sulfur Dyes
• Vat dyes
• Naphthol dyes
• Acid dyes
• Basic dyes
• Mordant dyes
some of the dyes are described below,
• They are widely used and most economical of all classes. Direct dyes are soluble in water and have an affinity for a wide variety of fibers.
• Good for pastels and light shades, but medium and heavy colors have poor washing and lightfastness.
• These type of dyes can produce a large range of colors and are today the accepted industry standard for dyeing cotton and rayon.
• Very bright shades of pink, green, blue and turquoise can be produced with reactive dyes.
• Colorfastness properties are good except to chlorine. These dyes are soluble in water.
• Reactive dyes can also be applied on wool, silk, and nylon; here they are applied under weakly acidic conditions.
• They are the most commonly used dyes for cotton.
• Generally, they are cheap, light-fastness, and easy to apply. Sulfur dyes are predominantly black, brown, and dark blue.
• Shades in sulfur dyes are dull. They are insoluble in water and have to be chemically applied to the fabric. Results are satisfactory for dry crocking, but poor for wet crocking and chlorine fastness.
• They are best for all-around fastness (except crocking) and are generally the most expensive. They are insoluble in water and they have the best chlorine fastness.
• Reasonably bright shades can be produced except for brilliant red.
• The indigo dyestuff used for denim is an example of a vat dye.
• They are soluble in water and have a limited color range.
• They are used mostly for brilliant reds, and also for maroon, brown and black.
• Washing fastness is equal to vat dyeing, but light fastness is less, while crocking fastness varies with the color.
• The azo dyes are the most important class of synthetic dyes and pigments, representing 60 - 80% of all organic colorants.
• They are used widely in the textile, leather, plastic, paper, mineral oil, waxes, foodstuff and cosmetic industries