Wool is still dyeing with media black PV?

Media black PV, as a acid -based media dye, has a wide range of applications on wool chromatography due to its excellent uniformity and coloring fastness, but there are problems such as environmental pollution and fibrous damage caused by high temperature and dyeing agents. In order to solve this problem, several types of hairy dyes are used to contrast the dyeing effects of the media black PV, and explore the use of active dyeing media for the black PV to reduce the pollution of the environment and the consumption of resources.

1 The advantages and disadvantages of media black PV

advantage

Has excellent color fastness and color stability.

shortcoming

Dyeing usually adopts post -media method. Excessive potassium chromate is interacted with residual dyes in the dye bath to generate metal complexes, which becomes a floating color on the surface of the wool and affects the color fastness. At the same time, wool is easily oxidized in the environment of high temperature and heavy chromium for a long time, and the opposite feel, elasticity and texture have a certain impact.

ways to improve

Use several common hair active dyes (British CE-2B, British CFE-G, British CFE-2B, British Black CFER, Mao active black MF-PV ) Replace the media black PV and optimize its craftsmanship.

Dye

40 ℃ dye (plus 1.3 ml HAC, pH value 3.9) → 98 ℃ insulation dyeing 45min (add 1 ml 3%HAC to maintain pH of 4.5 dyeing 15min → Add 0.5ml 3%HAC to keep pH 4.5 dyeing 15min → Add 1.6ml 1.6ml 3%HAC maintains a pH of 3.6 dyeing 15min) → cooling to 70 ° C to 70 ° C, 8.4ml K2Cr2O7 to keep it for 10 minutes → heat the temperature to 98 ° C 45min → cool down to 60 ° C.

Dye

40 ℃ dye (pH value 4.5) → heating up to 98 ° C stains 95min (add 0.75 ml 3%HAC to keep pH of 4.5 dyeing 15min → Add 0.75ml 3%HAC to keep pH 4.5 dyeing 15min → Add 0.75ml 3%HAC for maintenance 20min → Add 0.75ml 3%HAC for 20min → Add 0.75ml 3%HAC for 25min) → cool down to 50 ° C. The dyeing process changes in pH

As a typical protein fiber, wool has gender characteristics. The binding amount of wool fibers and anionic dyes during dyeing is related to the number of amino groups in its cocoa, and depends on the pH value of the dye or hydrogen ion concentration. Therefore, the change of the pH value in the process of controlling the dyeing process, maintaining a stable pH value is the key to obtaining the effect of high -quality chromatography.

4 base washing

In order to clean the floating color and improve the color fastness, wool dyeing, especially dark colors, usually requires alkaline washing. Several types of hair are washed by ammonia (0.4 ml ammonia water is added to 1 L distilled water, boiled, then 0.4 mL ammonia water, boiled for 5 min, add 0.4 mL ammonia water, and then cook for 5 min. Then put the cloth sample in the containing containing it. 0.1 ml of icoin acetic acid soak 2min in water for 2 minutes, dehydrate and dry).

5 Conclusion

The demand for acidic dyes on the hair is similar to the media black PV. During the dyeing process, it is necessary to obtain excellent dyeing effects by supplementing the best dyeing conditions.

From the perspective of dyeing effects, Mao's active black MF-PV is closest to the media black PV color light. The soap of various hair with active dyes is equivalent to the media black PV, but the stains and frictionality of sweat resistance are slightly better than the media black PV.

When the hair is dyed with active dyes, the surface of the wool fiber is severely floated on the surface, so it is necessary to use ammonia water boiling to fix it and treat it. However, during ammonia water treatment, its smell is more serious, so it can be replaced with sodium carbonate or sodium bicarbonate.