Acid yellow 36 is Yellow powder, Red light yellow to orange. Soluble in water, ethanol , ethyl, benzene and ethylene glycol, slightly soluble in acetone. In purple sulfuric acid, and it will produce red after diluted precipitation. In a blue nitric acid, then turned into orange. Its water solution with hydrochloric acid was red, and the precipitation produce; Add sodium hydroxide solution unchanged, excessive yellow produced after precipitation. Copper ions in dyeing color green dark; Iron ions in a shallow color; Chrome ions in a slightly change. Discharge the gender is good.
Acid yellow 36 Soluble in water, soluble in alcohol, ether, benzene and ethylene glycol ether, slightly soluble in acetone. It is purple in concentrated sulfuric acid solution, red precipitate after dilution; in case of nitric acid is blue, then change It is orange. The hydrochloric acid is red in the aqueous solution and precipitates; the sodium hydroxide solution is added, and a yellow precipitate is formed after the excess. The copper ion is dark and dark when dyed; the iron ion is lighter; the chromium is encountered. The ions are slightly changed. The discharge is good.
TRADE NAME:Acid Golden Yellow G,methanil yellow,Acid Metanil Yellow,Acid Yellow MT,Vicoacid Yellow 36,Dycroacid Metanil Yellow R
Standard | AATCC | ISO |
Fiber | wool | wool |
Soaping | 1 | 2 |
Persperation Fastness | 4 | 2~3 |
Oxygen bleaching | — | — |
Light Fastness | 3 | 3 |
leveing(grade) | displacement | whitening | solubility(g/L) | metal ion effect(grade) | ||
copper | iron | chromium | ||||
4~5 | A | well | 100(90℃) | 3~4 | 4 | 4~5 |
Test Methods | fiber | Alkali resistance | Carbonization | Chlorination discoloration | potting | Alkali fluff color change | seawater | soaping color change | Perspiration | Sun exposure | |
discolor | Staining | ||||||||||
AATCC | wool | 5 | 4 | — | 4 | 1 | 5 | 1 | 1 | 4 | 3 |
ISO | wool | 4 | 3~4 | 3 | 4 | 1~2 | — | — | 2 | 2~3 | 3 |
Mainly used for soap shading, in strong acid dye bath dyeing wool, also can dye leather. When used for paper to measure good color. Also can be used in the manufacture color amylum, paint, wood products, biological dyeing. Can also be used in medicine and cosmetics.
Acid Yellow 36 performs best on protein fibers (wool, silk) and on polyamide (nylon). It can be used on leather in acid dyebath systems designed for soluble acid dyes. It is not recommended for direct cotton dyeing without a mordant or special pretreatment.
As a starting point for protein fibers: 0.5–2.0% owf (on weight of fiber) depending on shade depth; liquor ratio 20:1–30:1; acidify to pH 3.0–4.0 with acetic acid; raise temperature slowly to 80–95°C and hold until exhaustion; cool and rinse. Adjust concentrations, pH and time for lab trials — fiber type, machinery and desired fastness significantly affect the final recipe.
Improve fixation by optimizing pH (keep it acidic during dyeing), extending fixation time at elevated temperature, and using a suitable after-fixation or leveling/stabilizing agent recommended for acid dyes. Post-dyeing acid rinse and proper drying also reduce migration and bleeding.
Common acid-dye auxiliaries (buffers, leveling agents, mild carriers for nylon) are generally compatible. Avoid strong oxidizing agents during dyeing. For specific formulations (dispersing aids, leveling agents) test compatibility in small trials, as additives can alter shade and fixation.
Store in a cool, dry, well-sealed container away from direct sunlight and moisture. Typical shelf life under proper storage is 12–24 months; perform batch checks (solubility and shade) if stored longer. Keep containers tightly closed to prevent caking.
Handle with standard industrial chemical precautions: avoid inhalation of dust, use gloves and eye protection, and provide good local ventilation. Follow SDS instructions for spill response and disposal. Waste dye baths should be treated according to local wastewater regulations to remove color and chemical oxygen demand before discharge.
