DE3206093A1 - Aftertreatment process for reactive dyeings - Google Patents

Abstract

The present invention relates to a novel aftertreatment process for reactive dyeing on cellulose fibres. The process according to the invention is characterised in that aftertreatment liquors are used whose pH continuously decreases during the aftertreatment process. The continuous pH decrease, preferably from a starting pH range of pH 10 to 13 to a final pH range of pH 6 to 9, is preferably achieved by single addition or by metering in of acid donors.

Description

Post-treatment process for reactive dyeings

The present invention relates to a new post-treatment method for reactive dyeing on cellulose fibers.

The method according to the invention is characterized in that aftertreatment liquors are used whose pH is continuous during the post-treatment process slowly decreasing.

The continuous decrease in pH, preferably from the starting pH range pH 10 to 13 to the final pH range pH 6 to 9 is preferably achieved by one-off Added or achieved by metering in acid donors.

The preferred starting pH range is between pH 10.5 and 12.5 and the preferred final pH is between pH 6 and 8.

If in the method according to the invention a single addition of acid donors takes place, the initial aftertreatment liquors can be characterized by that they contain 0.1 to 10 g / l of an acid donor effective in the alkaline medium.

The inventive method is particularly suitable for Post-bleaching of cellulose fibers or such fiber components dyed with reactive dyes containing fiber blends, in particular cotton materials dyed in the raw state. This is done using bleach liquors that contain hydrogen peroxide and alkali.

The aftertreatment process according to the invention makes it possible to obtain peel-free To achieve colorations.

Due to the preferred embodiment of the post-treatment method according to the invention, the re-bleaching of the cellulose fiber continues to save a costly and time-consuming process Operation, namely the thorough washing of the pre-bleached cellulose fiber before the actual dyeing process.

As acid donors particularly suitable for the process according to the invention are for example: sodium chloroacetate, sodium dichloroacet, sodium salt trichloropropionic acid, monochloroacetamide, butyrolactone, half-esters of sulfuric acid such as lauryl sulfate, hexadecyl sulfate or octadecyl sulfate, 2-ethylhexyl sulfate, butyl sulfate and sulfuric acid esters of oxyethylated and oxpropylated alcohols such as butyl glycol sulfate also C1-C4 alkyl esters of phosphoric acid or phosphorous acid, of phosphonic and Phosphinic acids such as dimethyl phosphate, triethyl phosphate, trishydroxyethyl phosphate, Dipropyl phosphite, diisopropyl phosphite, methane phosphoric acid dimethyl ester, ethyl phosphonic acid diethyl ester, 2-chloroethanephosphonic acid dimethyl ester Phosphonosuccinic acid tetramethyl ester.

The aforementioned compounds cleave under the reaction conditions Hydrogen ions from lowering the pH of the starting solution.

Mixtures are particularly suitable as acid donors to be metered in of acid-releasing agents with ammonium, alkylammonium and / or oxyalkylammonium salts.

Examples of suitable ammonium salts are: ammonium chloride Ammonium sulfate, ammonium acetate, diammonium phosphate, ammonium cabaminate, ammonium oxalate, Ammonium citrate, ammonium aminoacetate, ammonium lauryl sulfate, ammonium stearyl sulfate, paraffin sulfonic acid ammonium, paraffin sulfonic acid triethanolamine, dibutylnaphthalenesulfonic acid Ammonium, triethanolamine salt of dodecylbenzenesulfonic acid, monoethanolamine salt of Stearic acid, ammonium stearate, ammonium oleate, ammonium laurate, ethanolammonium laurate, Diethanolamine salt of monobutylphosphoric acid, diethanolamine salt of dibutylphosphoric acid, Diethanolamine salt of the acid sulfuric acid ester of alkyl or alkylaryl polyglycol ethers, The ammonium, ethanolammonium or triethanolammonium salt of stearyl sarcosidic acid.

The post-treatment and / or post-bleaching bath can still be commercially available Hydrogen peroxide stabilizers, plasticizers, wetting agents, detergents and defoaming agents as well as sequestering agents. As for the inventive method for adjustment Alkalis suitable for the starting pH range (pH 10 to pH 13) are preferred: Soda, potash, caustic soda, potassium hydroxide, trisodium phosphate and water glass.

Suitable reactive dyeings for the process according to the invention are preferred to mention those that contain at least one chloroquinoxalinyl, halotriazinyl, Have halopyrimidinyl and / or ethylsulfonyl radical. As reactive dyes water-soluble organic dyes containing sulfo groups are preferred the series of the anthraquinone, azo, azo metal complex, formazan, oxazine and phthalocyanine series into consideration. The reactive dyes specified in the application examples are exemplary listed.

The process according to the invention is generally carried out as follows: A) If the post-treatment process is a post-bleaching process: 1. Post-bleaching process in the remaining liquor: After completion of the reactive dyeing process is in the exhausted dye bath with a pH between 10 and 12, which Contains 30 to 120 g of table salt or sodium sulphate, 0.5 to 4 ccm / l of hydrogen peroxide 30% and 1 to 6 g / l of the acid dispenser to be used according to the invention and 1 to 3 g / l of an ammonium salt and with a heating rate of 0.5 brought to 85-950C up to 20C / minute. After staying at this temperature for 30 minutes the liquor is drained hot and rinsed with fresh water hot and cold.

2. Post-bleaching process with fresh liquor: The process according to the invention can also be carried out in such a way that the residual liquor is removed after dyeing and after rinsing a bleach bath is made up consisting of: 0.5 to 2 ccm / l 30% hydrogen peroxide 1 - 5 g / l peroxide stabilizer 1 - 5 g / l Detergent 1 - 3 g / l trisodium phosphate or soda or sodium hydroxide 1 - 4 g / l Acid donor B) If the post-treatment process is not a post-bleaching process acts: An aftertreatment process can for example be carried out in the manner be that after dyeing the exhausted dye liquor is drained and a post-treatment process corresponding to A 2, but without the use of hydrogen peroxide.

The "parts" identified in the following examples are in all cases they are parts by weight.

Example 1 100 parts of an unbleached cotton knitted fabric are in a reel skid treated in a 400 warm dye bath consisting of: 2 parts of the dye I 50 parts of table salt, 5 parts of soda and 942 parts of softened water It is dyed for 1 hour with brisk circulation of goods and then 1 part Caustic soda 380 Be added.

puts.

After a further 30 minutes, 1 part of sodium paraffin sulfate is added 2 parts of 30% hydrogen peroxide and 4 parts of sodium monochloroacetate were added.

After treating at 95 "for 30 minutes, the liquor is cooled to 800 and drained and the dyeing unit filled with 650 warm softened water.

It is then circulated for 10 minutes and the liquor is drained off. This The process is repeated. Then it is topped up with 650 warm softened water and brought to a boil. After 15 minutes of boiling, the cools Drained the liquor to 800 and rinsed with 600 warm water for 10 minutes. Man receives a deep red, clear, peel-free dyeing with good fastness properties.

Example 2 100 parts of an unbleached cotton knitted fabric are applied a nozzle dyeing machine treated with a 400 warm dye liquor consisting of: 0.035 part of dye 1 0.032 part of dye II 0.078 part of dye III 40 parts of sodium sulfate 5 parts of soda and 954.9 parts of softened water Es is dyed for 1 1/2 hours with vigorous liquor circulation and then once rinsed with cold and once with 650 warm water. The unit will then made up with softened water and 1.5 parts of caustic soda 380fle 2 parts Ammonium sulfate 1.5 parts of 30% hydrogen peroxide and 1 part of the reaction product of stearic acid diethanolamide mixed with 20 moles of ethylene oxide and slowly within 1 hour brought to 950. After 30 minutes of treatment at this temperature rature is cooled to 80 ° the liquor is drained once at 80 ° and once with cold Rinsed with water and then boiled with fresh water for 20 minutes.

A clear gray coloration with good fastness properties is obtained.

Example 3 100 parts of an unbleached cotton knitted fabric are used with 70 parts of a liquor impregnated, which consists of 3.0 parts of di- (2-ethylhexyl) phosphoric acid Sodium 1.0 part of dye IV 0.6 part of dye V 0.48 part of dye VI 10 parts soda and 984.92 parts softened water.

The goods are then stored for 12 hours at room temperature. The goods are then drawn into a reel skid and one with 1500 parts mixed with process water set liquor, which in 1000 parts 0.11 parts Caustic soda 1.8 parts hydrogen peroxide 30 Zig 1.0 part hexametaphosphate 5 parts Monochloroacetamide and 1 part oleyl alcohol octadecyl glycol ether contains.

The liquor is slowly brought to 95 "over a period of 1 hour and the temperature is then held for 30 minutes with good product circulation cooled to 80 "the liquor is drained and topped up with fresh process water, it is heated to 80 "and the liquor is drained again, then with fresh Water topped up and boiled for 15 minutes and treated as usual rinsed warm and cold. A clear beige color is obtained.

Example 4 100 parts of a cotton knitted fabric are made on a jet dyeing machine treated in a 400 warm liquor, consisting of: 2.0 parts of the dye IV 1.1 parts of the dye V and 3.1 parts of the dye VI 2.0 parts of anhydrous soda 80.0 parts of sodium sulfate and 911.8 parts of softened water.

It is treated at this temperature for 30 minutes and then in Heated 1/20 / minute to 50 °. After 20 minutes at 50 °, 2.0 parts of sodium hydroxide solution are added 380Be added and a further 30 minutes at this temperature colored. The float is then drained off and made up with 700 parts of cold water and run at room temperature for 5 minutes. This rinsing process is repeated then it is made up with 700 parts of water and 0.5 part of trisodium phosphate and 1.5 parts of monochloroacetamide and 0.5 part of the monoethanolamine salt of stearic acid added.

The aftertreatment liquor prepared in this way is brought to the boil and the dyed material treated at the boil for 15 minutes.

The liquor is then drained off and then heated twice at 60C and rinsed once in cold water. A deep black coloration with good results is obtained Reality properties.

Example 5 100 parts of a mercerized cotton cheesecloth yarn are treated with a liquor on a yarn dyeing machine at 500 90 minutes, consisting of: 0.6 parts of the dye VI 5.4 parts of the dye V 4.0 parts Trisodium phosphate 80.0 parts of table salt and 710.0 parts of water To this time the liquor is drained and three times with water at a temperature flushed from 600. It is then made up with fresh liquor, which is 2.0 parts Contains butyrolactone and 0.5 parts ammonium dibutylnaphthalene sulfonate.

It is brought to a boil and taken at this temperature for 15 minutes treated with good fleet circulation.

The aftertreatment liquor is drained off and then rinsed twice with 800 warm water. A deep ruby color with good fastness properties is obtained.

Claims (7)

Claims 1) Process for the aftertreatment of reactive dyeings on cellulose fibers, characterized in that aftertreatment liquors are used, whose pH value continuously decreases during the post-treatment process. 2) Method according to claim 1, characterized in that as Aftertreatment liquor uses a bleach liquor containing hydrogen peroxide. 3) Process according to Claims 1 to 2, characterized in that after-treatment liquors are used whose initial pH is between pH 10 and 13 and their final pH is between pH 6 and 9. 4) Process according to Claims 1 to 3, characterized in that after-treatment liquors are used whose initial pH is between pH 10.5 and 12.5 and whose final pH value is between pH 6 and 8. 5) Process according to Claims 1 to 4, characterized in that the decrease in pH value due to the one-time addition of acid donors or through metering is achieved by acid or acid donors. 6) Process according to Claims 1 to 5, characterized in that after-treatment liquors are used, which 0.1 to 10 g / l of a contain acid donors effective in the alkaline range. 7) Process according to Claims 1 to 6, characterized in that after-treatment liquors are used which have a temperature of 60 to 950C.