EP0021044B1 - Process for dyeing cellulose fibres and fibre blends containing cellulose fibres with reactive dyestuffs - Google Patents

Description

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

From FR-A-1 512 655 a process for dyeing cellulose fibers and cellulose / polyester mixed fibers with reactive dyes by the exhaust method at temperatures above 100 ° C is known, wherein in addition to alkaline substances, acid donors, in the form of halogenated organic compounds.

According to FR-A-1 507 101, cellulose fibers or cellulose / polyester mixed fibers are dyed with reactive dyes at temperatures above 95 ° C. in the presence of alkalis and by means of polyphosphates which provide hydrolysis acid.

The coloring in the presence of buffer substances in the acidic medium is not disclosed by any of the aforementioned property rights publications.

The method according to the invention is carried out in particular as a one-bath single-stage method and can therefore be used, for example, on high-temperature packing and cross-coil apparatus, jet dyeing machines, reel runners and jiggers.

• Das Textilmaterial wird 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 introduced into a dyebath which has a pH of 3.5-6.8, preferably 4.5-6.5, contains about 5-200 g / 1 of a conventional electrolyte, in particular sodium sulfate, and 1- Heated to 90-130 ° C, preferably 110-130 ° C for 2 hours, care being taken to ensure that the abovementioned 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 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 von Puffersubstanzen während des Färbevorganges.

The pH can be adjusted in different ways:

• 1. Setting the desired pH value 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 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.

• Das elektrolytische Färbebad wird bei 25-80° C mit Schwefelsäure, Essigsäure, Phosphorsäure oder Natriumbisulfat auf pH-Werte von etwa 4,5-5 eingestellt, das Textilmaterial eingebracht und anschließend 0,1-10 g/1 Mono-, Di- oder Tri-natriumphosphat, Borax oder Natriumacetat zugesetzt, bis ein pH-Wert von etwa 6-6,5 eingestellt ist. Danach wird Farbstoff zugesetzt und gefärbt.

The following procedure is particularly preferred:

• The electrolytic dyebath is adjusted to pH 4.5-5 with sulfuric acid, acetic acid, phosphoric acid or sodium bisulfate at 25-80 ° C, 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 set. 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 in order to achieve a pH value of around 6-6.5.

The dye baths preferably contain 30-120 g / 1 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 dispersion 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 laid-open documents 1 568 258, 1 469 657, 1 953069, 1 469 737, 2 430 853, 2 517 374, the German interpretation documents 1 258817, 1 258 821, 1 619 530, British patent specification 838 312, Swiss patent specification 12 274 and Austrian patent specification 206860 as well as in K. Lindner, Tenside - Textilhilfsmittel, Waschrohrstoffe, Volume 111, 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 quantity 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 mixture 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 the li-V dyes.

Example 2

und 1000 Teile Wasser enthält;100 parts of a mercerized knitted fabric are moved on a HT reel runner in a 95 ° warm liquor

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

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

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

100 parts of a mixed material made of 67 parts of polyester and 33 parts of cellulose are moved on a HT reel runner in a 90 ° warm liquor

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

Example 5

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

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 consisting of cellulose fibres or containing such fibres from dyebaths containing aqueous electolytes 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.

2. Process according to Claim 1, characterised in that the dyeing is carried out at 110-130⁰ C.

3. Process according to Claims 1 and 2, characterised in that the dyeing is carried out at pH 4.5-6.5.

4. Process according to Claims 1-3, characterised in that dyebaths which contain 5-200 g/I of electrolyte are used.

5. Process according to Claims 1-4, characterised in that the process is carried out as a one-bath single stage process.

6. Process according to Claims 1-5, characterised in that mixtures of cellulose fibres with polyester and/or polyamide and/or polyacrylonitrile are dyed with reactive dyestuffs and disperse dyestuffs, acid dyestuffs or cationic dyestuffs.