DE3906769A1 - METHOD FOR DYING TEXTILE MATERIALS FROM CELLULOSE FIBERS AFTER A PEROXIDE WHITE - Google Patents

Description

When dyeing cellulose fibers with reactive dyes already have an effect small amounts of hydrogen peroxide or other peroxide compounds in the Dye bath a reduction in the color yield. Textile materials Cellulose fibers bleached with hydrogen peroxide or per compounds after a simple rinsing of the textile material After bleaching still small amounts of hydrogen peroxide or per compounds, which are then stained with reactive dye lead to a reduction in the color yield. Even after one Drying bleached textile materials made from cellulose fibers Hydrogen peroxide or per compounds have been bleached in the subsequent dyeing in an aqueous bath with reactive dyes always a reduction in the color yield due to adhering peroxide residues in the Textile material tight.

To avoid disruptions in subsequent finishing processes Peroxide residues in the textile cellulose material, the textile goods are treated after the bleaching process or immediately before dyeing usually with Reducing agents, e.g. with sodium sulfite, sodium bisulfite, sodium pyro sulfite or thiourea. However, this method of peroxide removal has the disadvantage that the excess reducing agent, before dyeing the Textile goods with reactive dyes must be carefully rinsed out, because otherwise residues of the reducing agents are the reactive dyes would destroy or change.

The invention has for its object a method for dyeing bleached textile materials made from cellulose fibers or blends To provide cellulose fibers with synthetic fibers, in which residues of hydrogen peroxide or per compounds from a previous one Bleaching process can be removed by adding an auxiliary and in the the aid can also be used in excess without the To adversely affect the dyeing process.

The object is achieved with a method for dyeing textile materials made of cellulose fibers or mixtures of cellulose fibers with synthetic fibers with reactive dyes in an aqueous liquor Presence of dyeing aids following peroxide bleaching,  if you wash the textile materials with an aqueous liquor before dyeing brings in contact or dyes therein, each 0.05 to 5 g / l glyoxal, Contains glyoxylic acid or mixtures thereof. In a preferred one Embodiment of the method according to the invention contains the aqueous fleet

• a) glyoxal, glyoxylic acid or mixtures thereof and
• b) dispersants, surfactants, complexing agents or mixtures thereof in the weight ratio a): b) from 1: 0.5 to 5. Using the The inventive method, it is possible in the by residual peroxides Cellulose fiber materials caused a decrease in color yield to prevent when dyeing with reactive dyes.

The textile materials consist of or contain cellulose fibers Cellulose fibers mixed with other fibers. You can in any Processing state, e.g. as a flake, card sliver, yarn, skein, Woven or knitted fabric. The cellulose fibers can either be natural or regenerated cellulose, such as cellulose, or Polynosic fibers, act. Synthetic fibers mixed with Cellulose fibers present in the textile materials are, for example Polyester fibers or synthetic polyamide fibers.

The textile materials, the cellulose fibers, if necessary, in a mixture with others Fibers are usually subjected to pretreatment and bleached. Pretreatment is particularly important for textile materials required that contain raw cotton. The pretreatment consists of generally in a decoction of the textile goods in a fleet, the Contains sodium hydroxide solution, complexing agents and wetting agents. This pretreatment is carried out to remove impurities from the raw cotton, otherwise released from the textile during the dyeing process and would interfere with the dyeing process. Following this pretreatment the textile goods containing cellulose fibers are bleached. The Bleach is also in an aqueous liquor at temperatures up to 100 ° C carried out. The bleaching bath usually contains peroxide stabilizers, caustic soda and as actual bleach Water peroxide or per compounds such as perborate or peracetic acid.

After bleaching, the fabric is rinsed with water and then washed in aqueous liquor colored with reactive dyes. With discontinuous The cellulose fiber material can be bleached depending on the process Remaining amount of peroxide also without rinsing or with just one rinse dye with reactive dyes directly after bleaching if one  glyoxal and / or glyoxylic acid is added to the fresh bath according to the invention. It is advantageous here to contain the textile material containing cellulose fibers first with the solution of the glyoxal and / or the glyoxylic acid before Treat the dyes cold or warm for up to about 10 minutes e.g. at temperatures up to 50 ° C of the aqueous liquor. After that the textile is either in the same bath or in a fresh fleet dyed with reactive dyes. However, you can also do that the textile material containing bleached cellulose fibers, if appropriate after a single rinse, place it directly in a dye liquor that as essential components a reactive dye and 0.05 to 5 g / 1 Contains glyoxal, glyoxylic acid or mixtures thereof and colors them. At Both process variants are used for dyeing with reactive dyes Loss of color yield and a change in color avoided.

The amounts of glyoxal and / or glyoxylic acid to be used are dependent on the amount of residual peroxides in the textile. Generally you need when dyeing in a long liquor (liquor ratio 1:10 to 40) 0.05 to 2 g / l glyoxal and / or glyoxylic acid and when dyeing after cold retention procedure 0.5 to 5 g / l glyoxal and / glyoxylic acid in the pad dye bath (Fleet consumption 70-120%). Glyoxal or glyoxylic acid or their Mixtures can also be used as a component of a dyeing aid Contains dispersants, surfactants and / or complexing agents, the dye bath are fed.

Suitable dispersants are, for example, homopolymers of acrylic acid, methacrylic acid, maleic acid, copolymers of acrylic acid and methacrylic acid, copolymers of acrylic acid or methacrylic acid and maleic acid, acrylamide, methacrylamide, acrylonitrile, methacrylonitrile, C ₁ - to C ₆ -alkyl esters of ethylenically unsaturated C ₃ - to C₅ -Carboxylic acids or itaconic acid, hydrolyzed copolymers of maleic anhydride and styrene, vinyl esters or vinyl ethers or the alkali metal or ammonium salts of the homo- and copolymers mentioned. Homopolymers of maleic acid are also understood to mean hydrolyzed polymers of maleic anhydride which are obtainable, for example, by polymerizing maleic anhydride in aromatic hydrocarbons, such as xylene or toluene, using peroxy esters or conventional polymerization initiators, such as tertiary butyl hydroperoxide or ditertiary butyl peroxide. The homopolymers and copolymers or the salts thereof are water-soluble in all cases. The molecular weight 0 of the polymers is 1000 to 100,000, preferably 50,000 to 80,000. The use of polyacrylic acid or copolymers of acrylic acid and methacrylic acid as a dispersant is particularly preferred.

Also suitable as dispersants are condensation products of β- naphthalenesulfonic acid and formaldehyde.

Mixtures which also contain anionic or nonionic surfactants in addition to glyoxal and / or glyoxylic acid and optionally dispersants are also suitable as dyeing auxiliaries. Suitable surfactants are, for example, C ₁₂ - to C ₂₀ -alkyl sulfates, C ₈ - to C ₁₈ -alkylbenzenesulfonates, C ₃ - to C ₁₂ -alkylphosphoric acid esters, both mono-, di- or triphosphoric acid esters being suitable, the addition products of 6 to 80 mol of ethylene oxide in 1 mol of a C ₁₂ to C ₂₀ alcohol and sulfuric acid ester of the ethoxylated long-chain alcohols and C ₈ to C ₁₂ sulfosuccinic acid ester. Instead of the ethoxylation products of C ₁₂ to C ₂₀ alcohols, the water-soluble alkoxylation products of these alcohols can be used, which can be obtained by alkoxylation of the alcohols with propylene oxide and ethylene oxide, butylene oxide and ethylene oxide, or ethylene oxide and butylene oxide. In the mixed alkoxylated compounds, the alkylene oxides can be present either in statistical distribution or in blocks.

In the process according to the invention, glyoxal and / or glyoxylic acid can be used can also be used in a mixture with complexing agents which bind the Water hardness is commonly used in dyeing processes, e.g. Polyphosphates, ethylenediaminetetraacetic acid, nitrilotriacetic acid and the corresponding alkali or ammonium salts of the above Complexing agent.

If dispersants, surfactants and / or complexing agents are used are used, for example, dispersants in amounts of 0.5 up to 5 g / l, surfactants in amounts of 0.5 to 5 g / l and complexing agents in Quantities from 0.2 to 5 g / l of dye liquor. The dye liquor or the aqueous one Liquor used for the pretreatment of the cellulose fiber material the bleach used contains

• a) glyoxal, glyoxylic acid or mixtures thereof and
• b) dispersants, surfactants, complexing agents and / or mixtures thereof in Weight ratio a) to b) from 1: 0.5 to 5. In some cases it may still be advantageous if the dye liquor contains additional auxiliaries contains, e.g. Solubilizers such as urea, glycols, methyl pyrrolidones, thioglycols, lactones.

The dyeing process can be carried out batchwise and continuously will. Reactive dyes are those dyes which form a chemical bond when staining with the cellulose. they contain, for example, the following reactive anchors: monochlorotriazine, Dichlorodiazine, monofluorotriazine, dichloroquinoxaline or vinyl sulfone groups. Reactive dyes are common commercial products. you will be for example in the Color Index, 3rd edition, volume 3, pages 3391 to 3560 (1971). Staining with reactive dyes is more common wise at temperatures from 30 to 90 ° C. After dyeing, this will be dyed textile material usually rinsed with water and with a soaped wetting agent and then again if necessary or rinsed several times with water.

The percentages in the examples are percentages by weight.

example 1

Raw cotton knitwear was made in an aqueous liquor in a liquor ratio of 1:20 with 5 g / 1 caustic soda, 2 g / l of the tetrasodium salt of ethylenediaminetetraacetic acid and 1 g / l of an adduct of 6 mol ethylene oxide with 1 mol of a C ₁₃ / C ₁₅ alcohol 2 Boiled for hours at 100 ° C, then rinsed twice with hot and twice with cold water. The textile material was then bleached in an aqueous bleaching bath in a liquor ratio of 1:20 for about 45 minutes at 98 ° C. The bleaching bath contained 1 g / l of a commercially available peroxide stabilizer (sodium silicate), 1 g / l caustic soda and 6 ml / l 35% Hydrogen peroxide.

After bleaching, the aqueous bath was drained and the bleached Cotton knitwear rinsed once with water and then in a fresh one entered aqueous liquor (liquor ratio 1:20) containing 0.2 g / l glyoxal contained. After a dwell time of the cotton knitwear of 10 minutes in the bath described was placed in the bath at 1% by weight the cotton knitwear, the red reactive dye C.I.18200, 5 g / l Sodium carbonate and 30 / l sodium chloride. The textile was in this Colored liquor for 30 minutes at 30 ° C and then rinsed as usual and soaped.

The result was a red color with a standard color yield that corresponds to a color yield in a dyeing process in which Connection to a peroxide bleach the textile material with 0.5 g / l sodium bisulfite pretreated and then rinsed carefully hot and cold.  

Comparative Example 1

The raw cotton knitwear described in Example 1 was made according to the there boiled and bleached the specified regulations. After draining the Bleach bath, the cotton knitted fabric was rinsed once with cold water, the rinse bath then drained and fresh water into the staining jar let in. After this treatment, the liquor still contained 0.1 ml 35% hydrogen peroxide. This bath was then set at 1%, based on the Weight of the textile goods, the red reactive dye C.I.18200, 5 g / l Sodium carbonate and 30 g / l sodium chloride and dyed the textile 90 minutes at 30 ° C. Then, as is usual with reactive dyeing, rinsed and soaped. The red color obtained was significantly lighter as a corresponding dyeing on a textile material, which after the Peroxide bleach pretreated with 0.5 g / l sodium bisulfite and then was rinsed carefully hot and cold. The color was also clear lighter than the corresponding coloring according to Example 1.

Example 2

A raw cotton knitted fabric pretreated and bleached according to Example 1 was rinsed once with cold water after bleaching. The The knitted fabric was then rinsed once and washed with a fresh fleet in the Treated liquor ratio 1:20, which contained 0.2 g / l glyoxal. To a residence time of 10 minutes in the fleet was given

0.5%, based on textile, of the orange reactive dye CI18260,
5 g / l sodium carbonate and
30 g / l sodium chloride

to. The textile material was 90 minutes at 30 ° C in the specified fleet colored and then rinsed and soaped. The color yield was much better than with a comparative staining in the absence of Glyoxal was made.

Example 3

Raw cotton knitwear was manufactured according to the instructions given in Example 1 boiled and bleached and after bleaching once with cold water rinsed. The knitted fabric was then rinsed once and with a fresh one Fleet treated in a 1:20 liquor ratio, the 0.2 g / l glyoxal contained. After a dwell time of 10 minutes in the fleet, they were given  

0.5%, based on textile goods, of the blue reactive dye CI61205,
5 g / l sodium carbonate and
30 g / l sodium chloride

and dyed the cotton knitwear for 90 minutes at a temperature of 30 ° C. After dyeing, rinsing and soaping took place as usual. The color yield was significantly better than with a comparison stain without glyoxal was obtained.

Example 4

Example 3 was repeated with the exception that the coloring of the Cotton knitwear after treatment with Glyoxal with a liquor performed the

0.5%, based on textile goods, of the yellow reactive dye CI13245 0.8 g / l sodium hydroxide
5 g / l sodium carbonate and
30 g / l sodium chloride

contained. The coloring was carried out at 80 ° C. within 60 minutes. The textile material was then rinsed and soaped. The color yield was much better than with a comparison staining, in which the treatment the cotton knit with Glyoxal has not been carried out.

Example 5

Example 3 was repeated with the only exception that instead of of the blue reactive dye mentioned there the same amount of the red Reactive dye C.I.25810 used. Here too it turned out that the Color yield was much better than with a comparative staining of the textile material not containing a fleet containing glyoxal was pretreated.

Example 6

Example 3 is repeated with the only exception that 1% is obtained on textile material, the blue reactive dye C.I.61211 instead of the reactive dye used there. The color yield of this Staining was better than that of a comparative staining in which under otherwise identical conditions the textile material is not with a glyoxal contained fleet had been treated.  

Example 7

A bleached cotton knitwear, which still contained peroxide residues, was dyed after the cold dwelling process in which the material with the following fleet stuck with a fleet intake of 80%:

10 g / l of the blue reactive dye CI61205,
2 g / l sodium carbonate,
8 g / l sodium bicarbonate,
50 g / l urea and
1 g / l glyoxal.

The padded material was wound up with a sheet of polyethylene packed tightly and stored for 24 hours at room temperature. After that was the coloring rinsed and soaped as usual. The color yield of this Coloring was significantly better than that of a comparative coloration in which was stained only in the absence of glyoxal.

Example 8

A cheese made of alkaline-boiled cotton yarn (Nm34 / 2, Weight 750 g) was in a laboratory stainer according to the following recipe Fleet ratio 1:20 bleached:

6 mm / l hydrogen peroxide 35%,
1 g / l of a commercially available peroxide stabilizer and
1 g / l caustic soda.

The bleaching liquor was raised from room temperature within 30 minutes Heated to 98 ° C and left at 98 ° C for 45 minutes. Then it was raised to 60 ° C cooled and drained. The textile material was then made with the same Amount of cold water rinsed for 10 minutes and then the rinsing liquor drained. The apparatus was then rinsed with cold water filled, the bath 1 g / l glyoxal and 1 g / l of a polyacrylic acid from Molecular weight 60,000 added and the yarn in 10 minutes Pretreated at room temperature. Then you added to the bathroom

0.5%, based on textile goods, of the blue reactive dye CI61211,
5.0 g / l sodium carbonate,
0.8 g / l sodium hydroxide and
30 g / l sodium sulfate.

The color was then within 1 hour at a temperature of 80 ° C. The colored material was then washed with fresh water rinsed cold and hot as usual, soaped and rinsed again. The one there The blue color obtained was much darker than a comparison color the same recipe but in the absence of glyoxal received.

Claims (3)

1. A process for dyeing textile materials made of cellulose fibers or mixtures of cellulose fibers with synthetic fibers with reactive dyes in an aqueous liquor in the presence of dyeing aids following a peroxide bleaching, characterized in that the textile materials are brought into contact with an aqueous liquor before dyeing or dyes therein, each containing 0.05 to 5 g / l glyoxal, glyoxylic acid or mixtures thereof. 2. The method according to claim 1, characterized in that the aqueous liquor

• a) glyoxal, glyoxylic acid or mixtures thereof and
• b) contains dispersants, surfactants, complexing agents or their mixtures in the weight ratio (a): (b) of 1: 0.5 to 5.

3. The method according to claim 2, characterized in that the aqueous liquor

• a) glyoxal and
• b) as dispersant homopolymers of acrylic acid, methacrylic acid, maleic acid, copolymers of acrylic acid and methacrylic acid, copolymers of acrylic acid or methacrylic acid and maleic acid, acrylamide, methacrylamide, acrylonitrile, methacrylonitrile, C ₁ - to C ₆ -alkyl esters of ethylenically unsaturated C ₃ - C _6- carboxylic acids or itaconic acid, hydrolyzed copolymers of maleic anhydride and styrene, vinyl esters or vinyl ethers or the alkali or ammonium salts of the homo- and copolymers.