2425-85-6
Toluidine Red
CAS: 2425-85-6
Molecular Formula: C17H13N3O3
2425-85-6 - Names and Identifiers
| Name | Toluidine Red |
| Synonyms | C.I. 12120 Toluidine Red Pigment Red 3 C.I.Pigmentred3 Basoflex Red 361 adctoluidineredb atlasolspiritred3 C.I. Pigment Red 3 C.I.PigmentRed3(12120) C.I. Pigment Red 3 (8CI) toluidine red (C.I. 12120) ((4-Methyl-2-nitrophenyl)azo)-2-naphthol 1-(4-Methyl-2-nitrophenylazo)-2-naphthol 1-((2-nitro-4-methylphenyl)azo)-2-naphthol 1-[(4-methyl-2-nitrophenyl)hydrazono]naphthalen-2(1H)-one (1Z)-1-[(4-methyl-2-nitrophenyl)hydrazono]naphthalen-2(1H)-one |
| CAS | 2425-85-6 |
| EINECS | 219-372-2 |
| InChI | InChI=1/C17H13N3O3/c1-11-6-8-14(15(10-11)20(22)23)18-19-17-13-5-3-2-4-12(13)7-9-16(17)21/h2-10,18H,1H3/b19-17- |
2425-85-6 - Physico-chemical Properties
| Molecular Formula | C17H13N3O3 |
| Molar Mass | 307.3 |
| Density | 1.1873 (rough estimate) |
| Melting Point | 270-272°C(lit.) |
| Boling Point | 447.81°C (rough estimate) |
| Flash Point | 251.3°C |
| Water Solubility | 211μg/L at 20℃ |
| Vapor Presure | 8.02E-10mmHg at 25°C |
| Appearance | neat |
| pKa | 13.45±0.50(Predicted) |
| Stability | Stable. May be moisture sensitive. Incompatible with strong oxidizing agents. |
| Refractive Index | 1.6500 (estimate) |
| Physical and Chemical Properties | solubility: slightly soluble in ethanol, acetone, benzene, dark red-purple in concentrated sulfuric acid, orange precipitation after dilution; Dark vermilion in case of concentrated nitric acid; in dilute sodium hydroxide does not change. hue or color: yellow Red relative density: 1.34-1.52 Bulk density/(lb/gal):11.1-12.6 melting point/℃:276-278 average particle size/μm:0.26-0.53 particle shape: rod-like specific surface area/(m2/g):8-25 pH value/(10% slurry):6.0-7.1 oil absorption/(g/100g):33-80 hiding power: translucent diffraction curve:  reflection curve:  This product is bright red powder, melting point 258 ℃, fine powder, high coloring power and hiding power Good heat resistance, acid and alkali resistance, soluble in concentrated sulfuric acid for Deep Purple, diluted orange precipitation. Dissolved in concentrated nitric acid is dark red, dilute sodium hydroxide does not change color, slightly soluble in ethanol, acetone and grass. |
| Use | Used for printing ink, paint, cultural materials coloring The pigment is also known as toluidine red, belonging to the larger varieties, large particle size of the dosage form is blue red, in the alkyd resin with the extension of drying time, the gloss decreased, resulting in light fog; Small particle size of yellow light, light fog phenomenon is not obvious; Light fastness 7, light color (1:4 TiO2) for the 4 level. It is mainly used in air self-drying paint hard PVC, less used for printing ink, and the number of products on the market is 95. it can be used for the coloring of mud, pencil, crayon, water color and oil color pigments and rubber products; It is also suitable for paint cloth, paint, plastic and natural lacquer, and brushing sand tube, coloring of arts and crafts and cosmetics. |
2425-85-6 - Risk and Safety
| Risk Codes | R41 - Risk of serious damage to eyes R50/53 - Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S39 - Wear eye / face protection. S60 - This material and its container must be disposed of as hazardous waste. S61 - Avoid release to the environment. Refer to special instructions / safety data sheets. |
| UN IDs | UN 3077 9/PG 3 |
| WGK Germany | 3 |
| RTECS | QK4247000 |
2425-85-6 - Upstream Downstream Industry
2425-85-6 - Reference Information
| color index | 12120 |
| LogP | 5.4 at 25℃ |
| NIST chemical information | Information provided by: webbook.nist.gov (external link) |
| (IARC) carcinogen classification | 3 (Vol. 57) 1993 |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| application | toluidine red, like para red, belongs to azo series of chemical synthetic dyes. it is mainly used for coloring oil paint and rubber products and is solid at room temperature. |
| use | toluidine red is widely used in paint, inkpad, ink, pencil, crayon, watercolor and oil paint, as well as natural raw paint, rubber and plastic coloring. It can also be used for coloring cosmetics, arts and crafts products, yarn tubes, etc. it can be used for coloring inkpad, ink pencil, crayon, watercolor and oil paint and rubber products. It is also suitable for coloring lacquer cloth, paint, plastic and natural raw lacquer, sand pipe, arts and crafts and cosmetics. used for coloring ink, paint, stationery used for coloring plastic, rubber products, stationery, paint printing, etc. |
| preparation | using the low solubility of the coupling component 2-naphthol in an acidic or neutral pH aqueous solution at a temperature below 65 ℃, the coupling reaction of diazo and 2-naphthol is carried out at a temperature below 65 ℃, and the PH value is controlled at 2~9, then the unreacted 2-naphthol is precipitated out in the crystalline form of reactants, and then the coupling reaction is carried out to prepare toluidine red. |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-10 22:29:15
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