DE2808291A1 - Dyeing of cotton fabrics reserved with resins and/or waxes - using pre-reduced sulphur dyes - Google Patents

Abstract

Use of pre-reduced (levco) sulphur dyes for dyeing cotton fabrics reserved locally by application of resins and/or waxes, is claimed. Pref. the cotton is bleached, scoured and mercerised before printing with the wax reserve. Suitable waxes with their m. pts. are rosin (90-100 degrees C), paraffin wax (50-52 degrees C), ceresin (60-80 degrees C), carnauba wax (82-90 degrees C), beeswax (63-65 degrees C), Japanese wax (42-55 degrees C), and their mixts. No reducing process, which can adversely affect the wax reserve print on the fabric is required. Use of levco sulphur dyes extends the colour range possible from indigo indanthrene, anthrasol and naphthol AS dyes by this process.

Description

The present invention relates to a method for

Under-dyeing of cotton with pre-reduced sulfur dyes Use of waxes as a local reserve agent.

It has been found that cotton can be obtained under local reservation Can dye with pre-reduced sulfur dyes by acting as a reservation agent Mixtures based on resins and waxes used.

Resins and waxes of this type come into consideration (rosin): Melting point 90 to 1000C. Paraffin: Melting point 50 to 520C. Ceresin (earth wax): Melting point 60 to 800C. Carnauba wax: melting point 82 to 900C. Beeswax: Melting point 63 to 650C. Japan wax: melting point 42 to 550C and the like.

The waxes are preferred less on their own than in mixtures each other, mostly related to more expensive items. The waxes or their mixtures To make it cheaper, colophonium is sometimes preferred in varying quantities added and in general little is added for fine patterns and larger areas more rosin is added, on the other hand, the softer varieties of these waxes are used conversely, to soften the brittle colophony or paraffin reserves or the harder types of wax are used. Resin oils are also possible, most of them can be used in conjunction with rosin in machine printing. Solid fats like Beef or mutton tallow, coconut fat. Vaseline: melting point 60 to 800C.

These fats as well as petroleum jelly are mainly used to make harder waxes or To make wax mixtures smoother and softer.

The waxes and resins are used to improve applicability each according to working conditions, desired effect, climatic conditions or to increase the economic viability of petroleum distillates, turpentine and the like, as well as fillers based on kaolin or chalk added.

The cotton, in the form of mainly textile fabrics can be colored according to the invention, is preferably in bleached, causticized and mercerized Fcrm.

The wax is applied in a liquid state at a Temperature from about 40 to 1250C depending on the melting point of the axis. The printing of the fabric with the wax and resin-like mixtures takes place in a known manner and By means of printing machines with the chassis and rollers heated or by hand Model or pens.

After printing the textile material with the above waxes the textile material is cooled and the wax solidifies. It may be desirable to break the wax layer under cold water or in the open air to create a desired one To achieve a vein or break effect in the subsequent dyeing.

According to the invention, the coloring is carried out with pre-reduced sulfur dyes carried out, known in the Color Index as eucoSulhur Dyes " are.

The coloring is done with these pre-reduced sulfur dyes in a manner known in principle by dipping in a dye liquor or by a Padding process.

The subsequent removal of the wax reserve also occurs in principle known manner by means of organic solvents or by Soaps at boiling temperature. The removal is preferably carried out in such a way that the Reserve funds can be recovered for reuse.

You can remove all or part of the wax reserves, with a possibly remaining reserve (pearl) when overprinting later special effects e.g. a snow effect can be achieved.

The dyed textile material can after removing the reserve and after the Finishing, if desired, can be further overprinted (translated). This overprinting can by the most varied of processes with all known classes of dyes, the are suitable for cotton dyeing.

Coloring with waxes and resins as reserve agents is from the literature known in principle, but has so far only been used for indigo, indanthrene, anthrasol or. Naphthol AS dyes recommended. The advantage of the method according to the invention with pre-reduced sulfur dyes is that there is no reduction process takes place during dyeing at room temperature and thus the wax reserve pressure is not disadvantageous being affected. There is also the option of using a large number of pre-reduced Sulfur dyes to expand the color nuances.

In the following examples, parts are parts by weight and percentages Percentages by weight and temperatures are given in degrees Celsius.

Example 1 A 100% bleached caustic cotton fabric is used by means of a duplex roller printing machine with a mixture consisting of 80 Parts rosin 10 parts ceresin 10 parts Japan wax in a warm, liquid state printed.

After the wax has cooled and solidified, the goods are dipped stained in the bathroom.

Dye liquor: 30% indine blue 8 fl. (Dye mixture from Sodyeco) 6 g / l Sodyefide B fl. (Reducing agent based on Na2SjNaHS and polysulfide) 35 g / l Table salt liquor ratio: 1:40 Temperature: 300 Dyeing time: 30 minutes After the Dyeing, the treated goods are rinsed cold and oxidized in the air. On it will the fabric rinsed cold and to remove most of the wax reserve in the boiling Water washed. After that, the tissue is placed in a boiling aqueous bath which 2 cm / 1 of a dispersant based on a higher al iph. Polyalkylene glycol (Commercial product) and contains 1 g / l soda, soaped.

A blue pattern is obtained on a white background.

Example 2 A 100% bleached caustic cotton fabric is made by means of a duplex Rouleaux printing machine with a wax mixture consisting of 75 parts of paraffin 25 parts of carnauba wax printed in the liquid state.

After the wax has cooled and solidified, the goods are placed in a liquor consisting of 240 g / l C.I. Leuco Sulfur Green 36 40 g / l C.I. Leuco Sulfur Yellow 4 100 g / l urea 100 g / l Sodyefide B fl. (Reducing agent according to example 1) 1 g / l of a commercially available complexing agent based on metaphosphate padded at 400, squeezed off at a liquor pick-up of 25% and 2 hours at room temperature rolled up (wrapped in plastic). The goods are then rinsed cold oxidized in air and washed and soaped as in Example 1.

A green-colored pattern is obtained on a thin ground.

Claims (4)

.Process for dyeing cotton P a t e n t a n s p r ü c h e 1. Method of dyeing cotton under local reservation with pre-reduced Sulfur dyes, characterized in that mixtures are used as reservation agents based on resins and waxes. 2. The method according to claim 1, characterized in that as cotton, mercerized, causticized and bleached cotton is used. 3. The textiles dyed according to claim 1. 4. Use of resins and waxes as local reservation agents in the process of dyeing cotton.