Professional China Direct Yellow D-Rl - Manufacurer of Direct Copper Blue 2B –

Chemical properties:It is soluble in water as blue purple solution, and easily soluble in alcohol as red purple. It is emerald blue in case of concentrated sulfuric acid and purple after dilution. The aqueous solution is purple precipitated with concentrated hydrochloric acid, and the concentrated sodium hydroxide solution is red purple to wine red. For cellulose fiber dyeing, the dye absorption is very good, and the affinity * is at 100 ℃. Good discharge.

Application:It is mainly used for dyeing cellulose fibers such as cotton, hemp and viscose, viscose / nylon blended fabrics, leather and paper. After treatment with copper sulfate during dyeing, the light fastness can be improved. After treatment with formaldehyde, its washing fastness can be improved. Direct copper salt blue m has been developed to replace NW acid with L acid, and its color light is slightly darker than that of direct copper salt blue 2R.
Quality guarantee period: 24 months.
Packing: 25kgs iron drum.
Storage:Store in a cool and ventilated room and prevent moisture and heat.