DE1148212B - Process for the production of real dyes and prints on cellulose fibers or textiles - Google Patents

Description

Process for the production of real dyeings and prints on cellulose fibers or textiles It has been found that real dyeings and prints can be made on cellulose fibers and textiles obtained by using water-soluble anthraquinone dyes, which the Group -NH-CO-CH2-CH2-Hal in which Hal is chlorine, bromine or iodine, one or more times contained in the molecule, in the presence of acid-binding agents on the fibers or Applies textiles and the dyeings or prints, if necessary after intermediate drying, fixed by steaming or heating to a higher temperature.

For the production of the dyes, those supplying the acyl radical are used Acids converted into their acid halides or anhydrides in a known manner and the latter then with the amino groups of the dye components or the dyes implemented.

These water-soluble dyes react during dyeing and printing, which, bound to nitrogen, contain an acyl group of the type mentioned, with cellulose fibers under ether binding, and this binding is so strong that the dyeings or prints withstand a washing or soaping process.

The fixation of the dyes on the cellulose fibers is generally more complete when the remainder of the ß-halopropionic acid appears several times in the dye molecule is included.

The success of the present proceedings could not be foreseen because in the previous use of similar dyes with haloacyl groups for dyeing wool in the acidic range was worked, in which, as is known, acylamino groups are persistent. In the present case, however, it was to be expected that by heating the dye solutions in the presence of alkaline agents and water, the entire acyl radical is split off from the dye molecule at higher temperatures or that the halogen might react in some other way before it does with the cellulose reacted. It was found, however, that the solutions according to the present invention -to-use dyes against alkaline agents; which for fixation are necessary on cellulose fibers, are largely stable and therefore also durable and at higher temperatures not prematurely decomposed before they are with the cellulose react.

The dyes should expediently per se be little or no have substantive character, so after fixing the not with the cellulose The dyestuff that has undergone a chemical reaction can easily be rinsed or soaped can be removed again.

For the same reasons and to be as focused as possible when necessary Being able to produce printing pastes or block solutions gives the best results when the dyes contain at least two solubilizing groups in the molecule. SO3H or COOH groups are considered to be such.

Optionally, the pad solutions can also improve solubility Agents such as are customary in printing and dyeing practice are added.

The dyeings are now produced in such a way that the Dyestuff with the addition of an acid-binding agent and other in dyeing The usual additives dissolve, padding on the fiber, then the padding on dyeing is appropriate intermediate drying and fixed by steaming or heating; then it is rinsed and soaped.

Steaming is expedient at temperatures around 100 ° C and above carried out. The optimal fixation temperature and duration is with the individual Easy to determine dyes by means of a preliminary test.

Suitable acid-binding agents are alkali acetates, alkali formates, Alkali bicarbonates, alkali carbonates, alkali phosphates or alkali hydroxides or else the corresponding alkaline ones Ammonium compounds or aliphatic, heterocyclic or aromatic amino compounds.

In most cases one will get the carbonates or bicarbonates or Hydroxides of sodium, potassium or ammonium, especially soda, the block solutions to add.

The printing pastes are also useful with the addition of alkali carbonates, such as sodium bicarbonate, soda or potash and possibly others in the print shop Usual additives, especially urea, are made up, then printed and steamed or heated, rinsed and soaped.

The dyeings and prints have very good fastness properties and in many cases very great clarity.

Example cotton nettle is mixed with a padding solution containing about 25 g of the anthraquinone dye of the formula and contains 25 g of soda per liter. It is then dried in between and the dyeing is steamed for 1 to 10 minutes at 105.degree. Then it is rinsed and soaped.

A reddish-tinged blue is obtained which is fixed on the cotton and is washable Coloring.

Dyeings or prints with similar good fastness properties are obtained if one of the following anthraquinone dyes is used:

Claims (1)

PATENT CLAIM :. Process for the production of real dyeings and prints on cellulose fibers or textiles, dxiarch gekeaozeichset that water-soluble anthraquinone dyes, which the group - NH - CO - CH2 - CH2 - Hal is chlorine, bromine or iodine, contain one or more times in the molecule , is applied to the fibers or textiles in the presence of acid-binding agents and the dyeings or prints, optionally after intermediate drying, are fixed by steaming or heating to a higher temperature. Older patents considered: German Patent No. 1058 Q167.