CH312366A - Process and device for controlling a steam turbine group with reheating. - Google Patents

Description

Process for dyeing polyester bare textile fibers In beige patent 568049, an has described a process for the preparation of anthraquinone dyes suitable for dyeing polyester fibers which consists in acylating 1,4-dihydroxy-5-amino anthraquinone with a reactive derivative of a monocarboxylic acid, for example 1st trifluoromethyl-3 benzoyl chloride.

On the other hand, an has described, in the first Swiss patent 363633 a process for dyeing synthetic polyamide fibers by means of anthraquinone dyes containing at least one halogeno-alkyl group, for example -CH,cl, linked to an aromatic nucleus.

The present invention relates to a process for dyeing textile fibers based on polyesters. The process according to the invention is characterized in that at least one formalin dye is applied in the dispersed state to said fibers.

wherein one of the Xs represents a hydroxy group and the other an amino group.

The new formale dyes (1) can be prepared by condensing 4,5-dinitro chrysazine or 4,8-dinitro anthrarufin or a mixture of these isomers with a trifluoromethylaniline and subjecting the products obtained to reduction. The condensation can be carried out in an excess of amine or in an inert solvent, such as nitrobenzene, at temperatures between 120° and 210° C., preferably between 160 and 200° C. The condensation products can be iso- them by dilution in a dilute acid, such as hydrochloric acid or by distillation of the solvent with steam and filtration. The reduction can be carried out, for example, in a solution of sodium sulphide at around 90° C.

The formale dyes (I) can also be obtained by reacting 4,5-diamino chrysazine or 4,8-diamino anthrarufin or a mixture of these isomers with a trifluoromethylchlorobenzene. This reaction can be carried out in an organic solvent; It does very well in phenol or nitrobenzene at temperatures between 140 and 180 C in the presence of a copper bar catalyst, such as cuprous chloride, and an alkaline agent capable of fixing the acid formed, such as potassium carbonate.

The process according to the invention is applicable to the coloring of fibers based on polyesters. Such fibers are known on the market under the names of Terylene, Dacron, RTI ID="0001.0269" WI="10" HE="4" LX="1424" LY="2058"> Tergal, Vestan. It is possible to obtain on these fibers by dyeing or printing strong and vivid blue shades, remarkably fast to light.

The formalin dyes (1) have a better affinity for polyester fibers than the formalin dye.

described in example 4 of beige patent N 568049, and, subsequently, make it possible to obtain more full-bodied shades on said fibers.

In the following examples, parts and percentages are by weight and temperatures are in degrees Centigrade.

Example <I>1</I> 3.3 parts of 4,8-dinitroanthrarufin with 3.35 parts of m-trifluoromethylaniline in 30 parts of nitrobenzene are heated for about 8 hours at 180° C. The nitrobenzene is then removed by steam stripping. Leave to settle, take up with cold water, filter and wash with water. The product thus obtained is taken up in 100 parts of a 5% sodium sulphide solution. The mixture is heated for one hour at 90-95°C. The dye is partially dissolved. Ort completes the precipitation by adding ammonium chloride, filtering, washing the precipitate with a dilute solution of ammonium chloride and then with water until neutral. The dye thus obtained, put in the dispersed state, tints the Tergal in a full-bodied and vivid blue shade, very fast to light. Example 0n appears as in Example 1, but replacing the 4,8-dinitro anthrarufin with a 50/50 mixture of 4,8-dinitro anthrarufin and 4,5-dinitro chrysazine. 0n obtains a blue dye of similar shade possessing a very good light fastness. Example '<I>3</I> 0n heated for 8 hours at 155°C, 5.4 parts of 4,8-diamino anthrarufin with 8 parts of p-trifluoromethylchlorobenzene in 50 parts of phenol in the presence of 0.3 part cuprous chloride and 3 parts potassium carbonate. The phenol is then Amine by stripping with steam. 0n filter and wash with water. The dye thus prepared is dispersed. It dyes the Tergal to a lightfast, blue shade slightly redder than that of the dye of Example I. Example <I>4</I> If in Example 3, an replaces 4-diamino, 8 anthrarufin with an equal amount of 4,5-diamino chrysazine, an obtains a blue dye with a slightly less red shade, but just as solid.

Example <I>5</I> 1 part of the dye obtained in Example 2 is dissolved in 10 parts of concentrated sulfuric acid at room temperature. 0n pours the solution over a mixture of water and ice, filters and washes. The cake thus obtained is ground with 1 part of sodium dinaphthylmethanedisulfonate and added to a dye bath prepared with 2000 parts of water and 4 parts of a wetting agent in a high temperature dyeing apparatus. RTI ID="0002.0269" WI="5" HE="4" LX="1643" LY="644"> 0n introduces <B>100</B> parts of a Terylene fabric and closes the apparatus. 0n then heated in 40 minutes to 130 C and maintained for an hour and a half this temperature. The fabric is then taken out, rinsed with water and dried. It is dyed a full-bodied blue shade that is very fast to damp and light proof.

Claims (1)

CLAIM Process for dyeing textile fibers based on polyesters, characterized in that at least one dye of formula (1) is applied in the dispersed state thereto In which one of the Xs represents an OH group and the other an NH group:,.