DE946976C - Process for producing black prints - Google Patents

Description

Process for producing black prints It has been found that deep black prints of great abundance are obtained by using antidiazo or hydrazine sulfonic acids from 4-aminodiphenylamines, which apart from the amino group still others are not soluble may contain making substituents, together with i, 3, 5-trioxybenzene applies the fiber and subjects the goods treated in this way to a steaming process.

The use of antidiazo or hydrazine sulfonic acids of the diphenylamine series together with azo components containing hydroxyl groups for the production of insoluble azo dyes on the fiber has already become known from German patents 560797 and 563 o6z. To produce black prints by the known processes, however, one has hitherto relied on either combinations of antitetrazosulphonic acids of 4, q @ -diaminodiphenylamine with an azo component of the ice color series or v - i antidiazosulphonic acids of monoaminodiphenylamine with mixtures of the azo components that are technically suitable for printing purposes apply. Both working methods require very careful execution in order to achieve perfect results.

In contrast, the present method is a much larger one Security in the achievement of even prints given, 'because of the combination one Monoamine of the diphenylamine series with a single azo component is used. In addition, the present process allows either with either alkaline, neutral or acidic preparations work. The development of the prints can carried out in an alkaline or neutral, but preferably in an acidic medium especially the development in an acidic medium for dyes from antidiazo- or hydrazinesulfonic acids and azo components a new and surprising discovery represents. The possibility of both in the manufacture of the printing inks as well to work within a wider pH range when developing prints, gives the new method over the already known method the preference of a ', with greater ability to be combined with other dye classes and permitted its application to the most diverse, within certain pH ranges more sensitive Fiber types.

The new method is therefore in several respects the already known Process superior and is a valuable asset to technology. Example To a solution of 159 l, 3, 5-trioxybenzene and 45 g of a technical, powdery q'-methoxydiphenylamine-4-antidiazosulfonic acid sodium (with a purity of 57%, calculated on 4-amino-4'-methoxydiphenylamine) in 200g warm water at 40 ° 100 g of an aqueous ammonium thiocyanate solution (i: I) and 50 g of an aqueous one Sodium chlorate solution (I: 2). The solution thus obtained becomes neutral in 500 g Stir in the starch and tragacanth thickening and adjust to 100 g with 90 g of cold water.

Instead of the ammonium rhcodanide solution I: i, 25% acetic acid can also be used or 42% lactic acid can be used.

After the printing paste thus obtained has been printed on bleached cotton fabric and dried, it is steamed for 8 to 10 minutes at about 100 °, rinsed cold and then warm, with 2 g of a condensation product of an aminoalkylsulfonic acid and a higher molecular weight fatty acid, and 1 g of soda per liter of water Soaped, rinsed and dried at boiling point. This gives a deep black print. Instead of 45 g of 4'-methoxydiphenylamine 4-antidiazosulfonic acid sodium, in the above-mentioned printing paste So g of 4'-methoxydiphenylamine-4-hydrazinesulfonic acid sodium (with a purity of 27.6%, calculated on 4-amino-4 - methoxydiphenylamine) can be used. Example e 159 I, 3, 5-trioxybenzene and 55g of a technical powdery diphenylamine-4-antidiazosulfonic acid sodium (with a purity of 38.8%, calculated on 4-aminodiphenylamine) are dissolved with 250 g of warm water at 40 ° and poured into 5oo g neutral starch and tragacanth thickening stirred in. After addition of 5o g of an aqueous sodium chlorate solution (I: 2) is adjusted with 1 g 30 g cold water iooo.

Instead of sodium chlorate, sodium chlorite or sodium chromate can also be used be used.

After the printing paste thus obtained has been printed onto bleached cotton fabric and drying is carried out for 5 minutes in the presence of acetic acid-formic acid vapors about -Ioo ° steamed, rinsed, with 2 g of a condensation product of an aminoalkylsulfonic acid and a higher molecular weight fatty acid and 1 g soda per liter of water at boiling temperature soaped, rinsed and dried. A deep black print is obtained.

. If 90 g of 3-methoxydiphenylamine-4-antidiazosulphonic acid are used instead of 55 g of sodium diphenylamine-4-antidiazosulphonic acid (with a purity of 24.7%, calculated on 4-amino-3-methoxydiphenylamine), a low one is also obtained black print:

Claims (2)

PATENT CLAIMS: i. Process for producing black prints, characterized in that one antidiazo or hydrazine sulfonic acids from 4-aminodiphenylamines, which, in addition to the amino group, contain other non-solubilizing substituents can, together with I, 3, 5-trioxybenzene on the fiber and the so treated Was a steaming process. subject. 2. The method according to claim I, characterized in that that the steaming process is carried out in an acidic medium.