Direct Yellow 27

Application Features

Direct Yellow 27 alias direct light fast yellow 5G, direct bright yellow 5G, direct fast yellow 5G, direct bright yellow L-4G, tin yellow 5G. Appearance is dim yellow uniform powder. Water soluble, slightly sensitive to hard water, Dissolved in water, it is lemon yellow, soluble in cellosolve, slightly soluble in alcohol, slightly oozing in benzene and carbon tetrachloride. It is insoluble in other organic solvents. It is golden yellow in concentrated sulfuric acid. Light, soluble in concentrated nitric acid, a yellowish solution; partially dissolved in concentrated hydrochloric acid to yellow-orange. The aqueous solution with concentrated hydrochloric acid has a golden yellow precipitate, and concentrated sodium hydroxide has a golden orange precipitate. The copper and iron ion color changes. 

Most suitable for dyeing of viscose like cotton, flax, viscose rayon, acetate and jute, also for Ink, Leather and Paper coloration.

Use condition:

1. It has been used to dye cotton or viscose fiber to be bright yellow. It has good leveling and transferability, and has a certain hiding power for viscose fiber with uneven quality. The dyeing rate is general. The stage dyeing solution should be naturally cooled to 25~40 °C, which is good for dye exhaustion.

2. It has been used for dyeing rich fiber, dyeing rate is still good, color light is similar to dyeing cotton. It has also been used for dyeing silk, wool, nylon and vinylon. Dyeing silk, wool plus yuan powder and acetic acid, Dyeing nylon with formic acid. The dyeing rate of dyed vinylon is poor, and the color light is brighter than that of viscose fiber. When cotton, viscose fiber and other fibers are dyed in the same bath, silk, nylon, wool and cotton and viscose fiber are similar in color. Slim and stained, polyester and acrylic are not stained.

3. It has been used for direct printing of cotton or viscose fabrics, printing deep dark color should be added with urea modulation printing paste.

4. Direct Yellow 27 has been dyed with high-temperature dyeing and blending fabrics with disperse dyes. The dyeing bath is heated to 120 ° C under neutral conditions, or the body is boiled. After the dye is dyed with polyester, the dye is dyed. For half an hour, the cellulose fibers are fully colored to promote the dye exhaustion.

5. It has been blended with direct fast blue GL to form direct light green, as a commercial dye supply.

6. It has been used in dyeing and printing of viscose fiber and its fabrics. It has also been used for dyeing and printing of knitted fabrics and velvet blankets. It has been used in combination with other low temperature dyed dyes. The dosage is large. It is easy to yellow when it is dyed, so it should be noted.

Precautions

Direct Yellow 27 contains a carcinogenic aromatic amine o-aminoanisole, which is a banned dye.