CH203593A - Process for the preparation of a water-soluble azo dye. - Google Patents
Process for the preparation of a water-soluble azo dye.Info
- Publication number
- CH203593A CH203593A CH203593DA CH203593A CH 203593 A CH203593 A CH 203593A CH 203593D A CH203593D A CH 203593DA CH 203593 A CH203593 A CH 203593A
- Authority
- CH
- Switzerland
- Prior art keywords
- water
- soluble azo
- azo dye
- preparation
- dye
- Prior art date
Links
Landscapes
- Coloring (AREA)
Description
Verfahren zur Herstellung eines wasserlöslichen Azofarbstoffes. Gegenstand des vorliegenden Zusatz patentes ist ein Verfahren zur Herstellung eines wasserlöslichen Azofarbstoffes, welches dadurch gekennzeichnet ist, dass man diazo- tierte 2-Naphtylamin-6,8-disulfonsäure mit 2 - (.Sulfoäthylamino)-8-naphtol-6-sulfonsäure in alkalischem Medium vereinigt.
<I>Beispiel:</I> 30,.3 Gewichtsteile 2: Naphtylamin-6,8"di- sulfonsäure (112o1. Gew. 803) werden mit 200 Volumteilen Wasser und 15 Volumteilen roher Salzsäure von 20 B6 verrührt, mit Eis auf 3 C gekühlt und mit einer Lösung von 6,
9 Gewichtsteilen Natriumnitrit in 50 Volumteilen Wasser diazotiert. Die Diazo- verbindung gibt man nun bei 0'-C langsam in eine wässrige Lösung von 41 Gewichtstei len des Dinatriumsalzes der 2-(Sulfoäthyl- amino)-8-naphtol-6-suHonsäure und 30 Ge wichtsteilen calciniertem Natriumcarbonat. Nach beendeter Kupplung wird der Farb stoff ausgesalzen, filtriert und getrocknet.
Er eignet sich besonders zum Färben von Leder.
Chromgares Ziegenleder wird wie üblich entsäuert und mit 2 % des obigen Farbstof fes gefärbt. Das Leder ist vollkommen durch gefärbt und zeigt an der Oberfläche, wie auch im Schnitt eine gelbstichige Braunfär bung. Die fertig zugerichteten Leder sind gut zwickecht.
Process for the preparation of a water-soluble azo dye. The subject of the present additional patent is a process for the production of a water-soluble azo dye, which is characterized in that diazotized 2-naphthylamine-6,8-disulfonic acid with 2- (.Sulfoäthylamino) -8-naphthol-6-sulfonic acid in alkaline Medium united.
<I> Example: </I> 30.3 parts by weight of 2: Naphthylamine-6.8 "disulfonic acid (112o1. Wt. 803) are stirred with 200 parts by volume of water and 15 parts by volume of crude hydrochloric acid of 20 B6, and then stir up with ice 3 C cooled and with a solution of 6,
9 parts by weight of sodium nitrite diazotized in 50 parts by volume of water. The diazo compound is then slowly added at 0 ° C. to an aqueous solution of 41 parts by weight of the disodium salt of 2- (sulfoethylamino) -8-naphthol-6-sulfonic acid and 30 parts by weight of calcined sodium carbonate. After the coupling is complete, the dye is salted out, filtered and dried.
It is particularly suitable for dyeing leather.
Chrome goatskin is deacidified as usual and dyed with 2% of the above dye. The leather is dyed completely and shows a yellowish brown color on the surface as well as in the cut. The finished leather is well tweaked.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE203593X | 1935-10-15 | ||
CH199460T | 1938-08-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH203593A true CH203593A (en) | 1939-03-15 |
Family
ID=25723290
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH203593D CH203593A (en) | 1935-10-15 | 1936-10-09 | Process for the preparation of a water-soluble azo dye. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH203593A (en) |
-
1936
- 1936-10-09 CH CH203593D patent/CH203593A/en unknown
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