|
| | Naphthol AS Basic information |
| | Naphthol AS Chemical Properties |
| Melting point | 246-248 °C(lit.) | | Boiling point | 406.53°C (rough estimate) | | density | 1.1138 (rough estimate) | | refractive index | 1.4500 (estimate) | | storage temp. | Refrigerator | | solubility | Insoluble in water; sparingly soluble in ethanol | | pka | 9.70(at 25℃) | | form | Powder | | Colour Index | 37505 | | color | Beige | | PH Range | Non& uorescence (8.2) to yellow/green & uorescence (10.3) | | λmax | 394nm | | Major Application | Sensors, recording materials, photovoltaic cells, copying materials, photoreceptors, lithographic printing plates, inks, toner, paints, textiles, detecting cancer | | CAS DataBase Reference | 92-77-3(CAS DataBase Reference) | | EPA Substance Registry System | 3-Hydroxy-2-naphthanilide (92-77-3) |
| Hazard Codes | Xi,N | | Risk Statements | 43-51/53 | | Safety Statements | 36/37-61 | | RIDADR | UN 3077 9/PG 3 | | WGK Germany | 1 | | RTECS | QJ1897400 | | F | 10-21 | | HazardClass | 9 | | PackingGroup | III | | HS Code | 29242990 |
| | Naphthol AS Usage And Synthesis |
| Description | Naphtol AS is a coupling agent in cotton dying.
Occupational dermatitis was reported in a woman
involved in needlework, probably sensitized from
occupational contact with clothes. | | Chemical Properties | beige powder | | Uses | Naphtol AS was used as off-the-shelf color-based anion sensors in organic solvents. | | Preparation | aniline and 3-Hydroxy-2-naphthoic acid?condensation. | | Hazard | Low toxicity by ingestion. | | Contact allergens | Naphthol AS is a coupling agent in cotton dyeing, inducing
occupational dermatitis or contact allergy in consumers
in contact with cotton-dyed clothing. It has been
indirectly reported as a cause of occupational allergy due
to its coupling with Diazo Component 51, or as a crosssensitizer
or sensitizer associated with Pigment Red 23
in red parts of tattoos. Pigmented contact dermatitis is
usual in patients with a high phototype. | | Purification Methods | Crystallise it from xylene or AcOH which forms plates m 243-244o [Schnopper et al. Anal Chem 31 1542 1959]. [Beilstein 12 H 505.] | | Properties and Applications | rice or small red powder, melting point of 243 ~ 244 ℃, more sensitive to the air. In sodium hydroxide solution for yellow in liquid, insoluble in water and sodium carbonate solution, slightly soluble in ethanol, soluble in hot the difficulties. This product is widely used in the cotton fabric dyeing and printing. Dyeing cotton, cotton affinity is low, medium coupled ability. Can also be used for cotton yarn, polyester/cotton, PVA, viscose, silk and vinegar fiber dyeing, also can undertake direct printing, and reactive dye printing and cotton fabrics with the dye printing, discharge printing, the reactive dyes color printing and dyeing, and used to make quick pigment, fast amine element, element and organic pigment fast sulfonylurea medications. |
| | Naphthol AS Preparation Products And Raw materials |
|
