METHOD FOR PRE-TREATING AND DYEING CELLULOSE

Abstract

A method for pretreating and dyeing cellulose (2), comprising the steps of: providing a cellulose (2), carrying out a cationization reaction and carrying out a bleaching reaction by means of a bleaching agent, wherein the bleaching agent is stabilized by means of at least one stabilizer.

Claims

1. A method of pretreating cellulose, comprising the steps of: Providing a cellulose in the form of a textile web, thread or fiber composite; providing treatment means comprising bleaching agents, a stabilizer and cationizing agents; carrying out a cationization reaction; carrying out a bleaching reaction by means of bleaching agents, the bleaching agent being stabilized with the aid of at least one cationic or a non-ionic stabilizer.

2. The method according to claim 1, wherein the bleaching reaction, the stabilization of the bleaching agent and the cationization reaction are carried out essentially simultaneously.

3. The method according to claim 1, wherein the bleaching reaction and the cationization reaction are carried out in the presence of an alkaline reacting substance.

4. The method according to claim 1, wherein carrying out the cationization reaction leads to the formation of a covalent bond between cationization agent and the hydroxyl groups of the cellulose.

5. The method according to claim 1, wherein it is a continuous process.

6. The method according to claim 5, wherein the continuous process is carried out according to an impregnation method, wherein the mass ratio of the applied treatment agent to the mass of the textile is between 0.5 and 1.5.

7. The method according to claim 1, wherein the method is carried out essentially at room temperature or at temperatures between 40° C. and 80° C.

8. The method according to claim 1, wherein after the cationization reaction has been carried out, a coloring treatment is carried out by dyeing or printing the cellulose by means of a treatment agent, the treatment agent being an anionic water-soluble dye or an insoluble pigment.

9. A device for treating a textile substrate in the form of a fabric web, a thread or fiber composite, comprising a feed device of treatment means, a reservoir for receiving the treatment means, wherein the device further comprises a circulation device for circulation of the treatment means.

10. The device according to claim 9, wherein the reservoir has at least one outlets which is connected to the circulation device and the circulation device additionally comprises an inlet for new treatment agents, so that fresh and recirculated treatment agents can be mixed.

11. The device according to claim 9, wherein the reservoir is designed in the form of a gusset between two roller rolls and two sealing plates arranged at the ends of the rollers, and an outlet is arranged on each side of the two sealing plates, and the reservoir comprises a level sensor.

12. The device according to claim 9, wherein the reservoir is designed in the form of a submersible basin.

13. The device according to claim 9, wherein the feed device is designed in the form of a casting mechanism, an overflow weir or a slotted nozzle and in interchangeable form, the width of which is 20 to 100% of the length of one of the roller rolls.

14. The device according to claim 13, wherein the longest dimension of the casting unit, the slot die or the overflow weir is between 50 and 5400 mm.

15. The device according to claim 9, wherein the circulation device is designed in such a way that a treatment agent can be fed uniformly and without interruption, at a rate of 25-35 l/min and meter of the width of the feed device or, in the case of viscosity-increased treatment agents, at a rate of 20 l/min and meter of the width of the feed device, over the width of the feed device to the reservoir.

16. A method of dyeing a textile substrate, in particular using an device according to claim 9, comprising the steps of: Providing a textile substrate, in particular a substrate which has been pretreated by means of a method as described above; providing a treatment agent, carrying out a dyeing method by bringing the cellulose into contact with the dyeing agent.

Description

[0080] The invention is further explained below with reference to examples of embodiments shown in figures. Hereby show:

[0081] FIG. 1: Side view of a device in a first embodiment

[0082] FIG. 2: Top view of a device in a first embodiment

[0083] An device 1 shown in FIG. 1 is used for the treatment of a cellulose-containing textile fabric web 2, which is moved in a continuous process at room temperature in a direction of movement b. The device 1 comprises a casting unit, a caster, and a calender.

[0084] The device 1 comprises a casting unit 3 for feeding 30 treatment agent 4, which is in an anionic dyeing agent, a gusset 5, which forms a reservoir 5 by means of lateral sealing plates 50 and a pair of squeeze rollers 6. In addition, FIG. 1 shows a level sensor 51 which prevents the treatment agent 4 from overflowing from the gusset 5.

[0085] The caster 3 feeds the treatment agent 4 uniformly and without interruption along the cellulose-containing textile fabric web 2 into the gusset 5 via the feed 30 over its entire width of 2400 mm. 0.5 to 1.5 kg of treatment agent 4 is added to 1 kg of cellulose-containing textile fabric web 2.

[0086] The cellulose-containing textile fabric web 2 is passed through the gusset 5 and the nip roller pair 6. With the aid of the treatment means 4, the cellulose-containing textile fabric web 2 is dyed.

[0087] FIG. 2 shows the device 1 for treating the cellulose-containing textile fabric web 2 and its circulation device 7 in plan view. The circulation device 7 comprises an outlet 70 at each of the two lateral sealing plates 50 arranged at the gusset 5 and an inlet 31 at the casting unit 3. With the aid of the two outlets 70, the treatment agent 4 can be fed from the gusset 5 back into the casting unit 3. Via the inlet 31, fresh treatment agent 4 is fed to the casting unit 3, which mixes with the recycled treatment agent 4 from the gusset 5 and is used again to treat the cellulose-containing textile fabric web 2.