Acid dye is a dye which is typically used for colouring protein based fibres like nylon, wool and silk. The dyeing process usually requires an acidic environment to achieve effective coloration. This is achieved by adding an acid like acetic acid or citric acid to the dye bath. The acidic environment helps the dye molecules bind with the fibre.
Acid dyes require heat to set the colour. The heat setting process involves simmering, steaming or using dry heat, depending on the specific dye and fibre. Heat ensures that the dye molecules penetrate the fibre and become colour fast. Also the heat helps in the distribution of the dye equally across the surface of the fibre resulting in uniform and consistent colouration.
Acid dyes produce vibrant and intense colours and the colours resist fading when exposed to light or washed. They are available in a wide range of colours permitting extensive colour options and creative expression in dyeing projects.
Classification
Acid dyes can be classified into several categories basis their chemical composition and characteristics, some of them are as under:
Leveling Acid Dyes
These dyes are designed to achieve an even and uniform coloration on the fibre, helping to mitigate issues associated with uneven dye distribution. They are used where there is a requirement for maintaining consistent colours, especially in cases of solid coloured textiles, fabrics and garments.
Milling dyes
Milling dyes are associated with the milling process, which involves the production of densely woven, felted woollen materials. They are used primarily in the dyeing of woollen textiles and fabrics. The dyed colour remains stable and does not readily fade out when exposed to water and detergents.
Metal Complex Acid Dyes
Metal complex acid dyes contains metal ions within their chemical structure. They are particularly used in the dyeing of wool and silk materials where maintaining the quality and appearance of the fibre is essential. They resist fading and maintain their vibrancy when exposed to light and environmental factors.
DU Organics manufactures various dye intermediates which are used in a wide range of industries. For obtaining more information with respect to the same, visit our website or contact us today.