CH200681A - Process for the preparation of a new monoazo dye. - Google Patents
Process for the preparation of a new monoazo dye.Info
- Publication number
- CH200681A CH200681A CH200681DA CH200681A CH 200681 A CH200681 A CH 200681A CH 200681D A CH200681D A CH 200681DA CH 200681 A CH200681 A CH 200681A
- Authority
- CH
- Switzerland
- Prior art keywords
- sulfuric acid
- monoazo dye
- preparation
- dye
- new monoazo
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B29/00—Monoazo dyes prepared by diazotising and coupling
- C09B29/24—Monoazo dyes prepared by diazotising and coupling from coupling components containing both hydroxyl and amino directing groups
- C09B29/28—Amino naphthols
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Coloring (AREA)
Description
Verfahren zur Herstellung eines neuen Monoazo-Farbstoffes. Vorliegende Erfindung bezieht sich auf die Herstellung eines neuen Monoazo-Farb- stoffes, der Acetat-Kunstseide in grünlich blauen Tönen von guter Haltbarkeit färbt.
Gemäss der Erfindung wird der Farb stoff durch Kuppeln von diazotiertem 2 -Brom -4-nitroanilin mit 1-N ,B- hydrogyy- äthylamin-5-naphtol und Umwandeln des so erhaltenen unlöslichen Farbstoffes in seinen löslichen Schwefelsäureester durch Behand lung mit einem Sulfonierungsmittel herge stellt.
Beispiel: Die aus 21,7 Teilen 2-Brom-4-nitroanilin entstandene Diazoverbindung wird mit 20,3 Teilen des 1-N-ss-hydrogyäthylamin-5-naph- tol in saurem Medium gekuppelt. Die so er haltene unlösliche Verbindung wird abge trennt, getrocknet und dann langsam in Pulverform in 250 Teile 80%iger Schwefel säure eingerührt. Man rührt so lange um, bis die darauffolgende Löslichkeitsprobe befrie- digend ist.
Zu diesem Zweck wird eine kleine Probe entnommen, auf Eis gegossen und die entstandene Suspension filtriert. Das Feste wird mit Wasser umgerührt, mit Natrium- karbonat gerade alkalisch gemacht und er wärmt. Es soll eine klare Lösung geben. Die ganze Schwefelsäurelösung wird dann auf Eis gegossen. Der neue sich abtrennende Farbstoff wird abfiltriert und wieder in kaltem Wasser suspendiert.
Die Suspension wird mit 10% Salz (Volumgewicht) behan delt, mit Natriumkarbonat alkalisch gemacht und der neue Farbstoff abfiltriert und ge trocknet.
Der Farbstoff bildet ein schwarzes Pul ver, das sich in heissem Wasser zu einer blauen Lösung und in konzentrierter Schwe felsäure zu einer dunkelvioletten Lösung löst. Er färbt Acetat-Kunstseide in grünlich blauen Tönen von guter Haltbarkeit, wenn aus einem neutralen, 155 Salz enthaltendem Färbebad angewandt.
Process for the preparation of a new monoazo dye. The present invention relates to the production of a new monoazo dye which dyes acetate rayon in greenish-blue tones with good durability.
According to the invention, the dye is produced by coupling diazotized 2-bromo -4-nitroaniline with 1-N, B-hydrogyy- äthylamin-5-naphthol and converting the insoluble dye thus obtained into its soluble sulfuric acid ester by treatment with a sulfonating agent represents.
Example: The diazo compound formed from 21.7 parts of 2-bromo-4-nitroaniline is coupled with 20.3 parts of 1-N-ss-hydrogyethylamine-5-naphthol in an acidic medium. The insoluble compound thus obtained is separated off, dried and then slowly stirred in powder form into 250 parts of 80% sulfuric acid. The mixture is stirred until the subsequent solubility test is satisfactory.
For this purpose, a small sample is taken, poured onto ice and the resulting suspension filtered. The solid is stirred with water, made alkaline with sodium carbonate and it warms up. There should be a clear solution. The whole sulfuric acid solution is then poured onto ice. The new dyestuff which separates out is filtered off and suspended again in cold water.
The suspension is treated with 10% salt (volume weight), made alkaline with sodium carbonate and the new dye is filtered off and dried.
The dye forms a black powder that dissolves in hot water to form a blue solution and in concentrated sulfuric acid to form a dark purple solution. It dyes acetate rayon in greenish blue shades of good durability when applied from a neutral dye bath containing 155 salt.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB200681X | 1936-11-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH200681A true CH200681A (en) | 1938-10-31 |
Family
ID=10139832
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH200681D CH200681A (en) | 1936-11-30 | 1937-11-08 | Process for the preparation of a new monoazo dye. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH200681A (en) |
-
1937
- 1937-11-08 CH CH200681D patent/CH200681A/en unknown
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