EP0021044A1 - Process for dyeing cellulose fibres and fibre blends containing cellulose fibres with reactive dyestuffs - Google Patents

Abstract

1. Process for dyeing textiles consisting of cellulose fibres or containing such fibres from dyebaths containing aqueous electrolytes by the exhaustion process, using reactive dyestuffs with a reactive group which can be split off as an anion, characterised in that the dyeing is carried out in the acidic range in the presence of buffer substances.

Description

The invention relates to a process for dyeing textiles consisting of or containing cellulose fibers with reactive dyes with an anionically removable reactive group after the exhaust process from aqueous electrolyte-containing dye baths, characterized in that in the acidic range in the presence of acid acceptors, in particular buffer substances at 90 - 130 ° C colors.

The process is carried out in particular as a one-bath, one-step process and can therefore be used, for example, on high-temperature packers and cross-winder units, jet dyeing machines, reel runners and jiggers.

• Das Textilmaterialwird in ein Färbebad eingebracht, das einen pH-Wert von 3,5 - 6,8, vorzugsweise 4,5 - 6,5, aufweist, etwa 5 - 200 g/1 eines üblichen Elektrolyten, insbesondere Natriumsulfat enthält und 1 - 2 Stunden auf 90 - 130°C , vorzugsweise 110 - 130°C erhitzt, wobei darauf geachtet wird, daß während des gesamten Färbevorganges der oben genannte pH-Bereich eingehalten wird. Vorteilhafterweise geht man mit dem Fasermaterial in ein Färbebad ein, das eine Temperatur von mindestens 70°C aufweist.

The process is generally carried out as follows:

• The textile material is placed in a dyebath which has a pH of 3.5-6.8, preferably 4.5-6.5, about 5-200 g / l of a conventional electrolyte, contains in particular sodium sulfate and heated for 1 - 2 hours to 90-130 ° C, preferably 110-130 ° C, taking care that the above-mentioned pH range is maintained during the entire dyeing process. The fiber material is advantageously used in a dyebath which has a temperature of at least 70 ° C.

• 1) Einstellung des gewünschten pH-Wertes beispielsweise mit Säure und Puffersubstanzen in ausreichender Menge um während des gesamten Färbevorganges den gewünschten pH-Bereich einzuhalten. Besonders interessant ist diese Variante für HT-Apparate ohne Dosiereinrichtung im HT-Bereich.
• 2) Laufende pH-Korrektur durch Zusatz geeigneter Substanzen, insbesondere Puffersubstanzen während des Färbevorganges.

The pH can be adjusted in different ways:

• 1) Setting the desired pH value, for example with acid and buffer substances, in sufficient quantity to maintain the desired pH range during the entire dyeing process. This variant is particularly interesting for HT devices without a metering device in the HT area.
• 2) Continuous pH correction by adding suitable substances, especially buffer substances during the dyeing process.

Suitable buffer substances are, for example, mono-, di- and trisodium phosphate, sodium bisulfate, sodium acetate / acetic acid and others, which are described in large numbers in the literature.

The following procedure is particularly preferred:

The electrolyte-containing dyebath is adjusted to pH 4.5-5 at 25-80 ° C with sulfuric acid, acetic acid, phosphoric acid or sodium bisulfate. the textile material is introduced and then 0.1-10 g / 1 mono-, di- or trisodium phosphate, borax or sodium acetate are added until a pH of about 6-6.5 is established. Then dye is added and dyed.

In the process with pH correction, the dyebath is first adjusted to pH 4.5-5 with 0.1-2 g / 1 sodium bisulfate and / or monosodium phosphate, and di- or trisodium phosphate is added continuously during the dyeing process to achieve a pH value of around 6-6.5.

The dye baths preferably contain 30-120 g / l of electrolyte, especially sodium sulfate.

The process is of particular interest for the single-bath, single-stage dyeing of cellulose-polyester or polyamide or polyacrylonitrile mixtures with mixtures of reactive and disperse or acid or cationic dyes.

In the case of blends of cellulose and polyamide, both types of fibers can also be dyed with the reactive dyes tone-on-tone.

The method is suitable in principle for all cellulose reactive dyes with an anionically removable reactive group, which are described in large numbers. It is very particularly suitable for dyes with dichlorotriazinyl, monochlorotriazinyl, monofluorotriazinyl, fluoropyrimidinyl, dichloroquinoxalinyl, methylsulfonylpyrimidinyl and vinylsulfonyl or sulfatoethylsulfonyl reactive groups.

If necessary, customary auxiliaries, for example basic leveling agents such as are used in dyeing wool or polyacrylonitrile, can be added to the dye baths.

Particularly suitable connections are those in the Belgian patents 599 761, 686 619, 644 880, 717 693, the German published documents 15 68 258, 14 69 657, 19 53 069, 14 69 737, 24 30 853, 25 17 374, the German patent specifications 1 258 817, 1 258 821, 1 619 530, British patent specification 838 312, Swiss specification 12274 and Austrian patent specification 206 860 as well as in K. Lindner, Tenside - Textilhilfsmittel, Waschrohstoffe, Volume III, Wissenschaftliche Verlagsgesellschaft mbH, Stuttgart , 1971, pp. 2785-2787.

Without the usual alkali fixation, the process provides well-colored, level dyeings.

example 1

besteht.100 parts of a rayon yarn in the form of a spin cake are inserted into an HT yarn dyeing machine, which contains a 85 ° C warm liquor

consists.

The flow through the winding body is 8 minutes from the inside out and 8 minutes from the outside in. The resulting pH is between 4.5 and 5. The liquor is then heated to 110 ° C. in 25 minutes and the amount of 2.25 parts of trisodium phosphate dissolved in the batch vessel is slowly pumped in by means of an additional pump for 2 hours, so that sets a pH of 6.2 - 6.8 in the dyeing liquor and is maintained throughout the dyeing process.

After the two-hour dyeing treatment at 110 ° C., the mixture is cooled to 80 ° C. and the liquor is drained off. After rinsing twice with water at 80 ° C., the volume is topped up and treated for 15 minutes. Deep red spinning cakes with excellent fastness properties are completely uniformly colored. Similar good results are obtained when using dyes II - V.

Example 2

und

• 1000 Teile Wasser enthält; der sich einstellende pH-Wert beträgt 6,2. Die Flotte wird auf 115°C gebracht und zwei Stunden bei dieser Temperatur unter guter Flottenbewegung gefärbt.

100 parts of a mercerized knitted fabric are moved on a HT reel runner in a 95 ° warm fleet

and

• Contains 1000 parts of water; the resulting pH is 6.2. The liquor is brought to 115 ° C. and dyed at this temperature for two hours with good liquor agitation.

After the usual rinsing and washing, a level ruby-red color with good fastness properties is obtained.

If, instead of the dye V, the same parts of the dye VI are used, a level turquoise coloration with good fastness properties is obtained.

Example 3

und

• 1000 Teile Wasser enthält. Die Flotte wird auf 112° gebracht und zwei Stunden bei dieser Temperatur unter guter Flottenzirkulation gefärbt.

100 parts of a jersey material consisting of 59 parts of polycaprolactam, 13 parts of viscose and 28 parts of cotton are moved on a jet dyeing machine in a 90 ° warm liquor

and

• Contains 1000 parts of water. The liquor is brought to 112 ° and dyed at this temperature for two hours with good liquor circulation.

After the usual soaping and washing, a level red color is obtained.

Example 4

Die Flotte wird auf 130° gebracht und 1 Stunde bei dieser Temperatur unter guter Flottenzirkulation gefärbt. Man erhält eine egale Gelbfärbung.100 parts of a blending material made of 67 parts of polyester and 33 parts of cellulose are advertised on a HT reel runner in a 90 ° warm fleet

The liquor is brought to 130 ° and dyed for 1 hour at this temperature with good liquor circulation. A level yellow coloration is obtained.

3eis ^p iel 5

und

• 1000 Teile Wasser enthält.

100 parts of a knitted fabric, mercerized in one piece, consisting of 50 parts of cotton and 50 parts of polyester, are mixed on a cotton HT dyeing machine with a 60 ° warm liquor

and

• Contains 1000 parts of water.

The resulting pH is 6.2. The dyebath is brought to 125 ° and kept at this temperature for two hours with good liquor circulation.

After the usual boiling soap, a deep blue level dyeing with good fastness properties is obtained.

Claims (6)

1) Process for dyeing textiles which consist of cellulose fibers or which contain reactive dyes with an anionically cleavable reactive group after the exhaust process from aqueous electrolyte-containing dye baths, characterized in that in particular acid buffering agents are dyed in the presence of acid acceptors. 2) Method according to claim 1, characterized in that dyeing at 110 - 130 ° C. 3) Process according to claims 1 to 2, characterized in that dyeing at pH 4.5 - 6.5. 4) Process according to claims 1-3, characterized in that dye baths are used which contain 30-200 g / 1 electrolyte. 5) Process according to claims 1-4, characterized in that one carries out the process as a one-bath one-step process. 6) Process according to claims 1-5, characterized in that mixtures of cellulose fibers with polyester and / or polyamide and / or polyacrylonitrile with reactive dyes and disperse dyes or acid dyes or cationic dyes are dyed.