DE2155143A1 - Dyeing process - Google Patents

Description

Dyeing process

Priorities: November 9, 1970 and December 29, 1970 - Great Britain

The invention relates to a new dyeing process for dyeing cellulosic textile materials.

There exist a number of physical forms of cellulosic textile materials that are difficult to equalize in hues due to the obvious fact that the dye is not uniformly colored through the material to be colored diffused. Typical for such shapes are materials that "have several layers of a tightly woven textile material" Wraps made from spun yarn, such as three-strand mercerized Sewing thread or seven-strand mercerized embroidery thread,

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heavy torch canvas, ticking, belts, belt fabrics, ribbons with reinforced edges, "ladder tapes", and tapes with drawstrings for curtains, thread cakes made of viscose and all thick ones Packings made from non-spun cellulose fibers.

It has now been found that such materials by certain Classes of reactive dyes can be colored in well-penetrated and leveled colors;

wafirigen in a neutral or weakly acidic medium that contains an electrolyte, with the dye at a temperature above 10O ⁰ C in contact for a sufficient time until the desired penetration and exhaustion is reached, and then the dye on the material fixed by treating the colored material with an acid binding agent.

The essential new feature of the novel method is the unexpected finding that the vast majority of the water-soluble reactive dyes acidic in weak or neutral aqueous dye baths at temperatures of 100-140 ⁰ C are nearly as stable against hydrolysis than at the lower temperatures of 75-85 ° C, which has so far been recommended as the maximum temperature for such dye baths. The only exception of remarkable importance is the class which has a dichloro-s-triazine group as a group reactive with cellulose.

Reactive dyes, which have been found to be useful in the new process, are dyes _v the di- and tri-chloropyrimidine, sulfatoethylsulfone, sulfatoethylsulfonylamino, 5-chloro-6-methyl-2-methylsulfonylpyrimid-4-yl- , ß- (4- ♦ 5 ~ dichloropyridaz-6-one-1 -yl) propionyl-, acryloyl-, ß-phenyl sulfony Ipropionyl amino-, 2 "^ - dichloropyrimid ^ -yl-» 2-chlorobenzthiazole- 6-yl- ^ 1, ^ - Dichlorophthalazin-G-yl-, Dichloroquinoxaiin-, ß-Chloroäthylaminosulfonyl- and especially mono-chloro-s-trtazine groups, which amino,

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_ TL _

have etherified hydroxyl or anilino or substituted anilino groups. The dyes include members of the phthalocyanine, anthraquinone and azo series _t inclusive. Monoazo, disazo and metal complex azo dyes.

To determine suitability for use in the new process, the following simple test is given.

Two dyeings are carried out on cotton hanks using equal amounts of the dye. In any case, the dyebath also contains 80 g / l table salt and 5 g / l sodium t m-nitrobenzene sulfonate.

(a) The dyeing is for 45 minutes at 120 ⁰ C and at a pH of 5 * 0-5.5 CO, 15 g / l acetic acid) is carried out, then the dye bath is cooled to 80 ⁰ C, finally is sodium carbonate (2C g / l) is added, and then dyeing is continued for 45 minutes.

(b) The dyeing is carried out for 45 minutes at 8O ⁰ C under neutral conditions, then sodium carbonate (20 g / l) was added and dyeing is continued for 45 min. Both strands are then rinsed in water and boiled for 15 minutes with 0.3% detergent to remove loose dye.

In many cases it is found that the two colorations have the same depth of shade. However, if the coloration obtained by method (a) is weaker than that produced by method (b), then the difference can be determined using a geometric gray scale map such as are used for carrying out washing tests on colorations ( BS2663: 1961). A dye is considered suitable if the difference in shade depth is no greater than 4 ratings on this card. However, even at 5C ⁰ C is a reactive dye containing the dichloro- or dibromo-s-triazine, so unstable that it can not be used with the new process.

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The following dyes reactive with cellulose, which with their Color Index reference numbers (reactive) have successfully passed this test, for example:

black 8th 7, 9, 17 and 19th 55 26, 40, 46, 49 Brown 2, 5, 5, 19 * 21, 25, blue 2, and 8th 52 , 55 and 45 green 5 Is 12, 15, 25, .25, orange 2, 15, 19th , 56 and 58 Red 5, 6, 15, 18 and yellow 5,

The new method can be performed in a variety of staining devices that are suitable for dyeing at temperatures above 100 ⁰ C, such as package dyeing tanks for cylinder winding, coning, cops, trees, torpedoes * strands packed chains, belts, narrow woven fabrics or all kinds of piece goods wound on perforated holders, containers for loose goods, pressure jiggers, reels and jet dyeing machines.

The new process may conveniently be carried out by reacting the immersed material to be dyed in the dye liquor, which can already be warm and may comprise, for example, about 40 ⁰ C, the material then to the dyeing temperature, preferably 12C-125 ° C, heated, and then maintain that temperature until the desired penetration and exhaustion is achieved. This usually takes 50 minutes to 1 hour, but shorter or longer times may be advisable in special cases. Thereafter, the acid-binding agent used for fixing the dye on the Faeer the dye liquor added in the preferred mode of operation, after the latter preferably up 80-90 ⁰ C is cooled. Alternatively, the material can be transferred to a separate container for treatment with a solution of the acid-binding agent,

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or the staining liquid can be drained off and replaced with a solution of an acid binding agent.

The coloring liquid can contain the usual additives, of which a neutral or weakly acidic salt in general is essential to achieve sufficient exhaustion. In this regard, sodium chloride or sodium sulfate can be used can be used in concentrations of 10 to 100 g / l, optionally with small amounts of acidic salts, e.g. Sodium dihydrogen phosphate to adjust the pH of the dye liquid in a range from 6.0 to 7 * 0. It can too other usual accessories may be present. In particular, it is desirable that a mild oxidizing agent, such as sodium nitrobenzene sulfonate, is present.

The invention is explained in more detail by the following example * wherein the parts are by weight.

example

The material to be dyed consisted of a cotton ribbon with a width of approximately 3 A ^^ mm, which had been wrapped around a piece of cord and sewn through in the middle. The cotton ribbon had the following characteristics:

Tape 2 poly / 18's cotton 20 twists / 25 mm

Cord 4 χ 4 ply. 4.1 "" 4 ply. 8.8

Single / 14's. 28

It consisted a.i so of a dense cotton mass with a weight of 12.0 g per 0 * 9 m. It should be used in the production of Hot seals can be used.

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2155U3

When dyeing in the usual way at 80 ^° C., it was found that the penetration of the dye into the centrally sewn part was insufficient. Not only the cord * but also the cotton ribbon itself was dyed a much paler color than the outer surface. On the other hand, completely uniform coloring inside and outside was achieved by the following procedure;

A piece of tape was wrapped around a penholder for a cylinder wrap wound around until a cylinder roll weighing 700 g was obtained, and then the roll was placed in a laboratory package dyeing machine used and dyed after cleaning and acid rinsing in 7 kg of a dye liquid, which contained the following:

dye No. -1 4th 1.5 VJl g / l ti No. 2 3 100 g / l ti No. 3 g / l Sodium nitrobenzene sulfonate g / l Table salt g / l

The Färbef] _r uid was placed for 20 minutes at 120 ° C and 30 maintained at 120-125 ⁰ C min and then cooled to 9O ° C. Then, sodium carbonate was / l was added in an amount of 20 g, and the dye liquor has a further 60 min at 90 ⁰ C is circulated.

The material was then rinsed in cold water and in hot water, in a 0.1% detergent solution 15 ml at the boil cleaned, rinsed again in hot and cold water and finally drained and dried.

The following was used:

Dye 1: The 1: 2 chromium complex of the monoazo compound Cyanuric chloride, 4-nitro-4'-aminostilbene-2,2 ■ -

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di8ulfonic acid and 6 ~ amino-2- (o-carbo; xj?} henylazo) -1-naphthol-3-sulfonic acid (equimolecular proportions).

Dye 2: 2- ^ '- ^ "- Chloro-V'-amino-s-triazine-e" -ylamino) 2' ureidophenylazcQnaphthalin-3-6.8-trisulfonic acid.

Dye 5- The copper complex of 6- (2 '-chloro-4'-aniino-s-triazine-6' -yl) -N-aethylamino-2 ~ [4 "- (2"', 5 "' -disulfophenylazo ) -5 "-methyl-2" -hydroxyphenylazo] - '1-naphthol-3-sulfone ~ 3 acid.

A very dark brown color was obtained.

The following table provides a list of other dyes that have been found to be suitable for Suitable for use in the new process. Column I gives the Color Index designation or the trade name, provided the dye is used does not appear in the Color Index, and column II gives the respective cellulose-reactive group.

Color Index

black 8 brown 2 brown 7 bra "on 9 brown 17 brown 19 blue 2
blue 3
blue 5
blue 19 blue 21 blue 25 blue 26 blue 40 blue 4-6 blue 49

Monochloro-s-triazine

π
η
η

2,3-dichloroquinoxaline Monochloro-s-triazine ß-chloroethylaminosulfonyl Monochloro-s-triazine ß-sulfatoethylsulfonyl

It

ß-chloroethylaminosulfonyl Monochloro-s-t-tiazine

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blue blue 64-blue 71 green 5 green 8 orange orange orange orange orange orange orange orange orange

red 3 red 9 red 13 red 56 red 58 yellow 3 yellow 6 yellow 15 yellow 18 yellow 33

Heatex Brilliant Yellow Elisiane Brllliant Red B

3,6-dichloropyrid8zin-4-ylcarbonylamino Monochloro-s-triazine

It

Il

ß-sulfatoethylsulfonyl Monochloro-s-triazine

ß-sulfatoethylsulfonylamino Ac ry1oy1amide

ß-phenyl sulfonylproptanylamino Monochloro-s-triazine

5-chloro-6-methyl-2-methyl8-sulfonylpyrimid-4-ylamino

Monochloro-s-triazine

t!
It

Trichloropyrimidine monochloro-s-triazine

ß-sulfatoethylsulfonyl Monochloro-s-triazine

ß- (4-, 5-dichloropyridaz-6-on-1 -yl) propionyl

2-chlorobenzothiazol-6-ylcarbonylamino

1 ^ -p carb onylamino

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Claims (2)

.9-2155U3 claims 1. A method for dyeing cellulose textile materials, the physical form of which makes dyeing in equalized shades difficult, characterized in that the material is in a neutral or weakly acidic aqueous medium containing an electrolyte with a water-soluble reactive dye at a temperature above 100 ⁰ C brought into contact his, the desired penetration and exhaustion are achieved, and that one then fixing the dye on the material by treatment of the dyed material with an acid binding i Kittel, wherein the dye is selected according to the above described test. 2. The method according to claim 1, characterized in that the dye used has a monochloro-atriazine group as a reactive group, the «« amino »etherified hydroxy, Anilino or substituted «anilino group · contains. 209820/1073