CH100190A - Process for the preparation of a sulfur-containing cotton dye. - Google Patents

Description

  

      Process for the preparation of a cotton dye. The invention is based on the observation that arylquinones, in particular halogenated benzoquinones, interact with o. Aminoaryl mercaptans condense and the condensation products obtained in this way, when treated with the usual sulphurizing agents, are converted into higher sulphurised bodies.

    which cotton in the sulfur sodium bath or in the hydrosulphite vat really stains. The o. Aminoaryl mercaptan can be used as such or in the form of an equivalent compound which, in the course of the reaction, generates an o. Aminoaryl mercaptan, for example in the form of an o. o. Dinitro or o. o. Diaminodiaryl disulfide, an o. Aminoarylthiosulfonic acid, a product of the action of chlorosulfur on an aromatic amino body (see Swiss patent no.

   71331 and additives) or one of the compounds that result from these action products through the action of water and iXlkalien (see Swiss patent no. 72277 and additives).



  The subject of the present patent is a method for the preparation of such a sulfur-containing cotton dye. The process is based on the fact that a halogenated benzoquinone is condensed with o. Amino thiophenol and the condensation product thus formed is further sulphurised with the usual sulphurizing agents. Such a starting material can also be used from which o. Aminothiophenol is formed as an intermediate. The new dye dyes cotton bathing in sodium sulphide or red-brown directly from the vat.

   The dyeings are distinguished by good fastness properties, in particular by a remarkable fastness to chlorine.



  <I> Example: </I> 25 kg of chloranil (or the equivalent amount of di- or trichloroquinone) and 12.5 kg or similar. Aminothiophenol (or the equivalent amount of o. Aminothiophenol chlorohydrate, or o. Aminothiophenol zinc mercaptide) are mixed with about twenty times the amount of water, alcohol or glacial acetic acid and cooked in a suitable vessel for several hours with thorough stirring. It is advantageous to add an amount of sodium acetate corresponding to the amount of hydrochloric acid released.



  After the reaction has ended, the product of the condensation has almost been eliminated in the form of a violet-blue, crystalline powder; the same is filtered off.



  20 kg of the condensation product obtained in this way are introduced into a PolSsulfidlösung which is produced by heating 40 kg of crystalline sodium sulfur and 25 kg of sulfur in about 100 liters of water. The whole thing is boiled for a long time, about 60 hours, under reflux, then the melt is diluted, more sodium sulphide is added to the solution of the partially precipitated dye, filtered hot and the dye is recovered from the filtrate in the usual way, for example by blowing out with air or Precipitation with dilute acids.

    The dye dissolves in a dilute solution of Schzvefelnodium solution with an olive green color and dyes cotton from such a solution or in the hydrosulfite vat red-brown; the colors are wash, light and chlorinefast.



  In the first phase of the reaction, that is during the condensation, instead of the o. Aminothiophenols the equivalent amount o. o. Diaminodiphenyl disulfide or aniline or thiosulfonic acid can be used.

 

Claims (1)

PATENT CLAIM: Process for the preparation of a sulfur-containing cotton dye, characterized in that a halogenated benzoquinone with o. Aminothiophenol is condensed and the condensation product thus obtained is treated with a sulfurizing agent. The dye dissolves in dilute sodium sulfur solution with an olive green color and dyes cotton from such a solution or red-brown in the Hy drosulfitküpe; the colors are wash, light and chlorinefast.