Formulation of reactive dye, manufacture thereof and method for dyeing fiber material using the same

Abstract

Abstract PURPOSE:To produce an aqueous liquid formulation of a reactive dye excellent in storage stability by causing components which are present in an aqueous solution of a crude reactive dye which contains by-products and are insoluble or hardly soluble in water to be adsorbed into an absorbent and separated, and then desalting and condensing the solution by the membrane separation method. CONSTITUTION:An adsorbent (e.g. activated clay) is added to an aqueous solution of a crude reactive dye (e.g. compounds of formulae I and II), thereby subjecting them to adsorption treatment to separate components which are present in the aqueous solution and are insoluble or hardly soluble in water. Then, the solution is desalted and condensed by the membrane separation method (e.g. the reverse osmotic membrane separation or electrodialysis method) to obtain an aqueous liquid formulation of the reactive dye. The resulting formulation can be stored for a long period of time without giving crystals, precipitates, etc. The solid formulation obtained by drying the aqueous liquid formulation is excellent in solubility, mechanical strength, flowability, etc., and can be suitable used for dyeing a fiber material, etc.

Inventors

• 👤 Shinji Nishimura
• 👤 信司 西村
• 👤 Noriaki Yamauchi
• 👤 山内　法明
• 👤 Toru Fujiwara
• 👤 亨 藤原

Bibliographic Details