Uses
Naphthol AS-OL is mainly used as a base agent for dyeing cotton and viscose fibers and printing cotton fabrics. Its properties are similar to Naphthol AS, and it can be blended to improve colorfastness. Combined with different color bases, it can produce a variety of colors such as orange, red, maroon, and blue. It is also used for dyeing vinylon, viscose, silk, nylon, and diacetate fibers, and for producing insoluble dyes, as well as fast pigments, fast amines, fast sulfonates, and lake pigments. It can also serve as an intermediate for organic pigments.
Preparation
O-Anisidine and 3-Hydroxy-2-naphthoic acid condensation.
Properties and Applications
m brown powder, melting point for 167 ~ 168 ℃. Insoluble in water, slightly soluble in sodium carbonate solution, soluble in ethanol. In sodium hydroxide solution for yellow. A little sensitive to the air. This product is mainly used for cotton yarns, cotton, cotton cloth, towel, bath towel, PVA, viscose, silk, polyamide fiber and two vinegar fiber and cotton cloth dyeing of direct printing, the printing and dyeing discharge printing. Can also be used to make quick pigment, fast amine element, element and organic pigment fast sulfonylurea medications. The affinity of cotton low, coupled ability medium.
