DE2440756C3 - Dye preparation for dyeing using the dipping vat method - Google Patents

Description

2. Preparation according to claim 1, characterized in that

S ^{that as c) sodium carbonate}

Process only deliver uneven colorations. indigo

SSe r SS

substantial oxidation to indigo occurs.

_{It has now} been found that _pen after Tauchkü method can obtain red colors with good fastness properties in use, when applying a dye _to b _ere itung that a) 25 to 35 weight percent finely dispersed perylene-SA ^ lO-tetracarbonsä _acid .to -N, N '- (p-chlorphenylimid), b) 35 to 60 weight percent of one or more dispersants, ^ 3 to 7 percent by weight of anhydrous alkali metal carbonate d) 13-8 weight percent Natriumdithio _{njt and} g e) _ege appropriate, 0 to 24 weight percent _inert Contains thinner.
With ^^^ i

The pigment preparation according to claim 1 or 2, consisting of 32 percent by weight (a), 52 percent by weight (b), 8 percent by weight (c) and 8 percent by weight (d)
8 percent by weight (d).

The invention relates to a dye preparation for dyeing cellulose or similar vegetable Fibers, using the immersion vat method.

Fabric webs and yarns made of cotton or similar vegetable fibers can be dyed by dipping them into a dye liquor containing indigo, reducing agents and alkali, followed by oxidation with atmospheric oxygen by hanging in the air (so-called air passage) at room temperature. This process, which is also known as dyeing in trains, can be repeated one or more times, whereby the fiber material can be dyed in different shades of blue. This dyeing process, known as the dipping vat process, is mainly used in less industrialized countries such as Africa. Latin America and East Asia, for dyeing certain textile articles, e.g. B. after the batik, Adire and wax print technique applied. This process can be used both under the simplest of conditions, e.g. in watertight holes in the ground or sheet metal canisters, as well as in modern continuous systems, e.g. B. for the continuous dyeing of cotton warp yarns for the production of denim articles, _who applied the

Dyes for coloring after Tauchküpen methods are suitable, the following conditions must be met: The dyes must a) be easily verküpbar,) b at room temperature (20 to 3O ⁰ C) colorable (ie, the dyes must not in the vat to the cellulose fiber or have only low substantivity) c) form a so-called vat skin on the vat, which protects the vat from further oxidation. In addition, d) the vat of the dye should have a high stability so that it can be used for a period of up to several weeks (upright vat).

This dipping vat process has so far only been carried out with indigo, because the vat dyes, because of their coloring properties, are based on this The dye preparation contains the perylene-3,4,9,10-tetracarboxylic acid-b ^ N ^ - p-chloramhd) m finely dispersed form The: D spe g.erung de Perytentetracarbonsäurednmids takes place in a known manner ^^ _{action of high} shear forces on the

Dye in the presence of dispersants, e.g. B. by kneading in kneaders or by grinding a aqueous suspension in a sand or bead mill. The kneaded material obtained or the aqueous material obtained Dispersion is dried in a known manner e.g. in drying cabinets or by atomizing

drying. ,. _n .

The dispersing agent used is ζ. Β the known anionic, such L.gninsu sulfonates, condensation products of Naphthal.nsu ^onsaure _n ^{u "d} .f ³ ^^" thol- or naphthalenesulfonic m «t Forma dehyd, condensation products of phenolsulfonic acids and / or phenols, formaldehyde and urea mn

into consideration. _M .. _m

The alkali carbonates are anhydrous sodium and Mentioning potassium carbonate, but it is preferable to use water-free for economic reasons Use sodium carbonate as an alkaline agent. The amount of your anhydrous alkali carbonate depends on the dye content. As a rule, based on dye, one will be approximate 20 to 55 percent by weight, preferably 25 to 45 Use percent by weight anhydrous sodium carbonate. The amount of sodium dithionite is in general, based on the dye, not really 20 to 55 percent by weight, preferably 25 to 45 percent by weight. The amount of the educational agent can be increased even further in exceptional cases for reasons of safety when dyeing, however, this is usually not necessary.

The dyeing process is carried out in the usual manner. The dye preparation is in a pre-sharpened Bath entered slowly with stirring, the vatting being complete in 5 to 20 minutes is done.

The vat can be used in the same way as with be dyed in several strokes of an indigo vat, between each puff the dyestuff has to be oxidized by hanging in the air. The dye preparation is also suitable for dyeing warp yarns for denim articles. The warp yarns pass through this In the form of a cable harness, there are continuously several vats with air ducts in between.

A continuous system suitable for this application advantageously has one or two network compartments with squeezing device, 4 to 5 immersion vats after the type of roller skids with squeezing device and 4 to 5 air passages over the immersion vats are arranged. This is followed by 1 or 2 compartments with squeeze devices for rinsing and washing and a drying unit.

With the preparations according to the invention, with the aid of the dyeing processes mentioned, red dyeings are obtained, those of indigo in terms of their application properties and other behavior correspond. In terms of shade, the colorations obtained come close to that of Alizarin red.

The parts and percentages given below relate to weight. For the The following dye preparation was used in the following dyeing process:

32 parts of finely dispersed perylene-3,4,9,10-tetra-

carboxylic acid-N, N'-bis- (p-chlorophenylimide),

48 parts of lignin sulfonate (sodium salt),
8 parts anhydrous sodium carbonate,
8 parts of sodium dithionite (90%) and

4 parts of purified, sulfated cellulose waste liquor as a further diluent.

example 1
Discontinuous dyeing

In a dye bath that has been pre-sharpened with 2 ml / 1 sodium hydroxide solution (38 Βέ) and 1.5 g / l sodium dithionite (90%) 7.5 g / l of the above-mentioned preparation are slowly stirred in at room temperature. After 15 minutes the dye is vat.

A fabric web or strands of yarn are dyed in 3 draws at a liquor ratio of 1:50:

1st puff 15 minutes residence time in the vat.

3 Toe I ^ ^{e 5} minutes residence time in the vat.

After each pull, the fiber material is squeezed off to about 100% moisture absorption and 15 Oxidized minutes by hanging in the air. After the 3rd hanging, rinsing is done in cold water. A red-dyed fabric web or red-dyed yarn strands are obtained which, in terms of their application technology Properties such as rubbing fastness, color change during washing, those obtained with indigo Colorations correspond. The dye bath can be used for further dyeing after the addition of a dye preparation used (2nd dye batch).

After every 2 batches of dyeing must be added to the dye preparation nor alkali and reducing agents are added, z. B. 2 ml sodium hydroxide solution of 38 ° Βέ and 1.5 g of sodium dithionite per liter of liquor. The ίο pH of the dye bath should be used at the beginning of the dyeing process not be less than 11.

Example 2
Continuous dyeing

Dyeing warp yarns for denim items:

The warp yarns - either as a cable strand or

as threads lying next to each other - are wetted in 1 or 2 compartments with a squeezing device,

ao then by 4 or 5 immersion vats in the manner of a

Roller runner guided with a squeeze device. Over

the air passage is located on each diving vat. To

The last air passage is washed and rinsed in 1 or 2 rinsing compartments. The dyed good will then

z. B. dried on a cylinder dryer.

The dwell time in the dipping vat is 50 to 60 seconds, while the dyed material remains below the Fleet surface. At a working speed of 20 m / min, the contents of each immersion vat are located at about 20 m 100% squeezed. The squeezed off liquor runs back into the immersion tank.

The air oxidation should last at least 3 minutes, ie the air passages must be designed for at least 60 m.
The following dye liquor was used:

Per liter of dye liquor
2 ml sodium hydroxide solution 38 ° Βέ

1.5 g sodium dithionite and
7.5 g of the above
riding applied.

Dye additive

To calculate the amount of dye to be added, the amount removed from the vat with the material is used The amount of dye determined analytically is used as a basis.

Claims (1)

Godmother: i vFTfzr ^{containing (based on} . a) 25 to 35 weight percent finely dispersed Perylene-SA ^ 10-tetracarboxylic acid-N.N'-bis-ipchlorphenylimide), b) 35 to 60 percent by weight of one or more ^ dispersants, c) 13 to 7 percent by weight anhydrous alkali carbonate, d) 13 to 8 percent by weight of sodium dithionite and optionally e) 0 to 24 percent by weight inert diluents.