DE1240035B - Process for the continuous dyeing of webs made of fiber material with Kuepen and / or sulfur dyes - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

Int. Cl .:

D06p A-

GERMAN

PATENT OFFICE

EDITORIAL

German class: 8 m - 3/01

Number: 1 240 035

File number: B66556IVc / 8m

Filing date: March 27, 1962

Open date: May 11, 1967

The invention relates to a process for the continuous dyeing of webs of any desired Fiber material with vat and / or sulfur dyes due to the development of steam; it exists in that the reducing agent used is compounds of the general formula

Z® QO ₂ S - C - A OH

used, in which A is a phenyl radical or a phenyl radical in which one or more hydrogen atoms are replaced by alkyl, hydroxyl, alkoxyl, amino, halogen and / or sulfo groups, and Z® a Means alkali or ammonium cation.

The continuous dyeing of fiber material with vat dyes using the so-called vat block process can known using the reducing agent sodium dithionite and / or Sodium formaldehyde sulfoxylate can be run. The use of these reducing agents is however associated with considerable disadvantages in the process mentioned.

Sodium dithionite unfolds its reducing effect already at room temperature, which is the case with Dyeing after the vat padding process has a very disruptive effect, as it causes the dyes to prematurely be dumped in the padder chassis. This is particularly useful when using mixtures of different Vat dyes as a result of the different substantivity of the sodium-leuco compounds often to differences in the depth of color at different points on a longer textile web.

In addition, sodium dithionite decomposes at a temperature of about 100 ⁰ C very quickly, so that a portion of the sodium dithionite remains unused during steaming of the material to be dyed vorgeklotzten due to decomposition.

The main disadvantage that sodium dithionite has as a reducing agent is also particular when used for the continuous dyeing of textiles with certain sulfur dyes (e.g. S c h u 11 ζ, color tables, 1931, no. 1111 and 1113, Vol. 1, pp. 481 and 482) expresses that as a result of the premature vatting, the sulfur dyes mentioned in the case of insufficient fine distribution to cause staining tend.

When using sodium dithionite as a reducing agent in the vat padding process for the continuous dyeing of
Sheets of fiber material with vat and resp.
or sulfur dyes

Applicant:

L. Brüggemann K.-G.,
Heilbronn / Neckar, Salzstrasse 123/129

The disadvantages that arise can largely be avoided if, instead of sodium dithionite, mixtures of sodium dithionite and sodium formaldehyde sulfoxylate or sodium formaldehyde sulfoxylate are used alone. In aqueous solution at 20 ⁰ C. The last-mentioned reducing agent has good resistance and acts at this temperature not vat dyes / eduzierend. When the textile material is padded, the dyes do not prematurely vat in the padder chassis.

Sodium formaldehyde sulfoxylate develops its reducing effect above 90 ^° C. in contrast to sodium dithionite, but relatively slowly, so that steaming times of 3 to 5 minutes are necessary when it is used in the process mentioned. These relatively long steaming times make continuous dyeing much more difficult. For this reason, sodium formaldehyde sulfoxylate has so far hardly been used as a reducing agent for the vat block process.

This prior art therefore makes it necessary to look for processes in which reducing agents come to use, both the advantageous properties of sodium dithionite as well as that of sodium formaldehyde sulfoxylate.

According to the invention, textile goods with vat and / or sulfur dyes can now be used dyeing the vat block process continuously under certain circumstances of the aforementioned difficulties, if the reducing agent used is compounds of the general formula

Z®eo ₂ S - C - AI

OH
used, where A is a phenyl radical or a phenyl

709 579/409

rest, in which one or more hydrogenTatomc by alkyl, hydroxyl, alkoxyl, amino, halogen and / or Sulpho groups have been replaced, and Z® denotes an alkali metal or ammonium ion.

In the same way, compounds can also be used which are derived from ammonia or primary or secondary low molecular weight, aliphatic amines and urea derive in that a or several hydrogen atoms of ammonia or of the amines mentioned on the nitrogen or of urea by residues of the general formula

25 parts of the Vat Black 19 / C dye. I. 59 855 (Color Index, 1956, Vol. 2, p. 2528),

80 parts of an aqueous sodium hydroxide solution (38 ° Be),

50 parts of the compound of formula

Na®

- C

845 parts of water,

Parts

Z® ^G O ₂ S - C - A

are replaced, in which A and Z® have the same meaning as in general formula I.

There are various options for the named derivatives of ammonia or its derivatives to win, for example, by adding ammonia or the amines or ureas mentioned can act on compounds of general formula I.

The new process has the advantage that the compounds of the type mentioned used according to the invention therein as reducing agents at room temperature even in the presence of strongly alkaline agents such as. B. sodium or potassium hydroxide do not reduce vat dyes and therefore cannot cause premature coupling or detachment of the dyes in the padder chassis. At temperatures above 60 ^° C., however, these compounds develop their reducing effect so quickly that the same short steaming times as when using sodium dithionite as a reducing agent are sufficient to fix the dyes on the textile material. The continuous dyeing of textile webs with mixtures of vat dyes, the sodium-glyco compounds of which have different substantivities, therefore does not present any difficulties when the compounds mentioned are used according to the invention as reducing agents, either by the padding or by the pad-and-stick method.

In addition, continuous dyeing with black dyes of the type already mentioned Trouble-free work while avoiding the formation of flakes is possible if instead of sodium dithionite Reducing agents can be used according to the invention.

The parts mentioned in the example are weight parts.

example

A bleached cotton canvas is made at room temperature in a double-roll foulard

padded. The textile web is then fed to a continuously operating steamer, ^{steamed for 80 to 90 seconds at 110 to 120 °} C. and finished in the usual way. The result is textile webs that are dyed the same side and end.

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Claims (1)

Claim: Process for the continuous dyeing of webs made of fiber material with vat and resp. or sulfur dyes according to the principle of vapor development, characterized in that that compounds of the general formula are used as reducing agents Z® ⁰ O ₂ S - C - A
OH used, in which A is a phenyl radical or a Phcnylrest in which one or more hydrogen atoms replaced by alkyl, hydroxyl, alkoxyl, amino, halogen and / or sulfo groups are, Z® is an alkali or ammonium cation, or compounds as reducing agents used that differ from ammonia or primary or secondary, low molecular weight, aliphatic Derive amines or urea by having one or more ammonia hydrogen atoms on the nitrogen or of the amines mentioned or of urea by radicals of the general formula H
Z® ®O ₂ S - C - A are replaced, in which A and Z® have the same meaning as in general formula I. Considered publications:
German Auslegeschriftcn No. 1 025 825,
654, 1 116 190.