Solvent Yellow 21
Solvent Yellow 21
CAS: 5601-29-6;12220-52-9;12220-77-8;12220-85-8;12220-90-5;12235-24-4;12270-05-2;155067-80-4;15977-59-0;2
Molecular Formula: C34H25CrN8O6
Solvent Yellow 21 - Names and Identifiers
Solvent Yellow 21 - Physico-chemical Properties
| Molecular Formula | C34H25CrN8O6 |
| Molar Mass | 693.62 |
| Density | 1.445[at 20℃] |
| Boling Point | 461.9°C at 760 mmHg |
| Flash Point | 233.1°C |
| Water Solubility | 170.1mg/L at 20℃ |
| Vapor Presure | 0Pa at 25℃ |
| Physical and Chemical Properties | Dark yellow powder. Slightly soluble in water, soluble in ethylene glycol ether, DMF and ethanol. |
Solvent Yellow 21 - Reference Information
| LogP | 1.098 at 20℃ |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| introduction | solvent yellow 21 is also called solvent yellow BL. its characteristic is that it has good solubility in organic solvents, bright colors and good sun resistance. it is a kind of high-grade colorant, which is mainly used in wood dyeing and various natural and synthetic leather coloring, and all kinds of metal transparent coating, solvent-based ink, aluminum foil, vacuum plating thin and bronzing material coloring. |
| preparation | a clean production process of solvent yellow 21, with o-aminobenzoic acid and 1-phenyl -3-methyl -5-pyrazolone as basic raw materials, including the following process steps: 1) coupling reaction: after 350g of o-aminobenzoic acid is dissolved in 500g of hydrochloric acid, 185g of sodium nitrite is added for diazotization reaction, the obtained diazo liquid is added to 400 grams of 1-phenyl -3-methyl -5-pyrazolone for coupling reaction for 2 hours, and the obtained suspension of azo is not filtered, washed with water, Drying, directly carry out the complexation reaction; 2) Complexation reaction: add 30 grams of acid binding agent and 150 grams of complexing agent CRF to the suspension of azo, stir evenly, add it to the pressure kettle for reaction, heating to 120 ℃-reaction for 1 hour, heating to 130 ℃ for 1 hour, heating to 140 ℃ for 1 hour, heating to 145 ℃ for 1 hour, heating to 150 ℃ for 2 hours, heating to 155 ℃ for 3 hours; After falling to normal temperature, it precipitates into water, filters, and washes to obtain complex B;3) Substitution reaction: The complex B is beaten in water, add 250g of nonionic surfactant R'-NH2Cl(R' is an alkyl group with carbon atoms in 10-12), raise to 60 ℃, react for 4 hours, filter, wash with water, and dry to obtain solvent yellow 21 finished product. |
| use | leather spraying yellow GL is mainly used for spraying or curtain coating of natural leather such as pigskin, cowhide, sheepskin, etc., especially suitable for spraying and coloring aniline leather. solvent amount BL is mainly used for coloring various plastic products, as well as for coloring coatings, inks and other articles. Neutral yellow 2GL is used for dyeing wool, silk and nylon and direct printing of fabrics. Excellent light fastness, also used for leather coloring, as well as plastic, paint, ink, etc. |
| Production method | Using anthranilic acid and 1-phenyl-3-methyl-5-pyrazolone as raw materials. The former is first diazotized, coupled with the latter, and then complexed with chromium formate in formamide solution to obtain the product. The finished product is filtered and dried.. using anthranilic acid and 1-phenyl-3-methyl-5-pyrazolone as raw materials. First, the former is diazotized, then coupled with the latter, and then the chromizing agent chromium formate is added to obtain the product. The finished product is filtered and dried.. Using 2-aminophenol-4-sulfonic acid and acetoacetanilide as raw materials, the former is first diazotized and coupled with the latter. Then add cobalt chloride for cobalt complexation to get the original dye. After filtration, drying, and crushing, the mixed solvent of ethylene glycol ether and ethanol is added to dissolve, and the impurities are filtered to obtain the dye product.. |
Last Update：2024-04-10 22:29:15
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