Some varieties of the dye in the dye color is pale, the imperceptible
Cosolvent to join, in addition to increase the dye solubility, but also to enhance the color, brightness and color fastness have a certain effect. Cosolvent: dissolved salt B, dithiobis ethanol, urea, ethylene glycol ethyl ether, diethylene glycol. Dissolved salt B and urea. Urea can not be excessive, otherwise it will affect the dye hair color.
Color soluble vat dyes, generally can be divided into two categories, namely, the acid bath and steaming. The representative of the acid bath of sodium nitrite method, steaming on behalf of sodium chlorate – ammonium thiocyanate method. Commonly used in direct , the sodium nitrite method and the two kinds of sodium chlorate – ammonium thiocyanate method. The sodium nitrite method is direct for a brief introduction. custom printed car flags
Acid color of the → drying → → to take the air → water washing → soaping → washing → drying.
Original paste 40 ~
Dye 1 to
Soda ash (or ammonia)
Cosolvent 0 ~
Hot water x
Sodium nitrite 0.2
The synthesis of
(3): dye and cosolvent mixture, add hot water to dissolve to clarify (blue IBC is preferable to dissolve in cold water), and the other will be added to the original paste of soda ash dissolved dye filtration and then dissolved into a paste, and finally sodium nitrite dissolved, stir, filter and set aside. Advertising Feather Flags
(4) color, and post-processing:
Sulfuric acid (500Be) 20-40ml
Color liquid temperature is divided into third gear based on the dye oxidation properties of easy oxidation of 25 ~ 3O ° C, generally 50 to 60 ° C, custom printed car flags the difficult oxidation of 70 ~
Color 15 ~ 30s, after the leak is fully washed, then boiled soap.
(B) direct the reactive dyes reactive dyes are a class of water-soluble dyes and existing dyes and fiber reaction of covalent bond in a class of dye. Active in the structure of dyes under alkaline conditions and fiber hydroxy or amino combine to form covalent bonds, it can be used for dyeing and of cellulose fibers and protein fibers.
Commonly used in domestic reactive dyes according to their active Decorative Flags And Banners genes can be divided into the X-type, KN, K and M type. The order of the size of the active X> M> (KN)> K, and its stability on the contrary, that is, the higher the reactivity of the dye, the more unstable, easily hydrolyzed stability is poor, made of paste, custom printed car flags the finished product prone to the "key" split between the dye maternal and fiber during storage. Therefore, the high reactivity of the X-type dye should not be used for with dye, K and KN reactive dyes production is often used, sometimes can be a small amount of several X-type reactive dyes to color requirements and the chromatography, .