Vat Black 27

Colour Fastness Test

The appearance of reduced Vat Black 27(olive R) is generally black powder, insoluble in water, acetone, alcohol, toluene and xylene. Slightly soluble in chloroform and pyridine; It is red in concentrated sulfuric acid and flocculent in fluorescence olive green after dilution.

Mainly used in cotton fiber dyeing, suitable for suspension pad dyeing, also used for cotton yarn of the jig dyeing cotton and the impregnation, rarely used for printing. Can with other VAT dye spell dyed noise. Dyeing silk, affinity and levelness were good, also used for Fiber/cotton blended fabric dyeing.

Vat Black 27 Use condition:

1.Reduction Vat black 27(Vat olive R) for jig dyeing of cotton products or impregnation, the most suitable method with b, usable a method or c method. When the color matching with dry cylinder restore advisable, also the original time take 10 ~ 15 min, the temperature of 40 ~ 50 ℃, the dry cylinder stable time 40 min. Reduction and dyeing temperature is unfavorable and exorbitant, otherwise it will occur to varying degrees of hydrolysis, the influence of dyeing and color fastness.

2.Reduction of cotton goods of olive R leuco high affinity, good levelness, dyeing curve as shown in figure 4, 5-45. With dead cotton cover. We must strengthen soaping after dyeing, to normal hair. Mainly used as suspension pad dyeing, jig dyeing process can also be used for dyeing cotton yarn and cotton cloth. Often used with other dye VAT dye spell gray, brown, dark green and dark blue color.

3.Reduced Vat Black 27(vat olive R) is rarely used in printing.

4.Reduction vat olive R low temperature dyeing viscose fiber, color is very shallow, colored cotton fiber is just slightly green. Dye whalen below color cotton fiber, and colored light blue and dark. Used for cotton blended fabric dyeing, color is a bit blue. Used for polyester/cotton blended fabric dyeing (65/35), polyester composition with a small amount of color (dark reddish light), can be the thermosol dyeing with disperse dye bath.

5.Reduced olive R dyed fabric is treated with urea formaldehyde or cyanaldehyde resin, and the color is slightly lighter and greenish.

Precaution

1.Reduction olive R jig dyeing or disseminated, dyeing temperature 50 ℃ will produce yellow. And prone to black side, black flowers, may be because of partial oxidation, generally, the insurance powder fluid can be used to process improvement.

2.Reductive olive R structure has amino acid, the amount of caustic soda should be controlled (7.5~8mL/L), otherwise the dye is easy to hydrolyze.

3.Vat Black 27(Vat olive R) dyed fabric turns green after mercerizing, and the soaping fastness is also poor. In the finishing of yarn-dyed fabric, if the mercerized alkali concentration is too heavy, the luster will turn green, so attention should be paid in the specific application.

4.The ironing fastness of reduced olive R is poor (red), and it is often used to match and dye gray.

5.Restore olive R should be stored in dry and ventilated place to avoid damp.