DE1283795B - Process for leveling felt and shrinkage resistant textile goods containing wool - Google Patents

Description

It is known that wool can be used with aqueous preparations for the purpose of reducing its fiIz- and shrinkage capacity to treat, the trichloroisocyanuric acid, dichloroisocyanuric acid or an alkali metal salt of dichloroisocyanuric acid contain. The treatment of the wool can take place at a pH value between 0.5 and 10 can be carried out. Treatment in the alkaline range usually leads to an even treatment Chlorination of the wool, however angilbene is often noted, and the duration of the reaction is relatively long. When using impregnation baths with a pH of 4 or less have, these disadvantages are eliminated, but you get unevenly finished textile material. Such Textile material has the disadvantage that staining with dyes unevenly takes place that a non-uniform feel and places with diminished mechanical Properties arise.

The German Auslegeschrift 1126 838 discloses a rather cumbersome two-bath process for making wool felt and shrink-proof, which consists of several individual, time-consuming process steps. First, the woolen fabrics must be impregnated with a polyacrylamide solution, then dried and then treated with a dichloro or trichloroisocyanuric acid solution. This process has two or even three stages and takes up to 3 ¹ ^ hours. The chlorination takes place at a pH value of 4 to 8.5. However, no level chlorinations are obtained with this multi-step process.

It has been found that level equipment is obtained when the acidic treatment bath is one Has a pH of 4 or less, also a water-soluble organic compound with at least contains an exchangeable hydrogen atom bonded to a nitrogen atom.

The invention relates to a process for the level felting and shrink-proofing of wool containing Textiles by treatment with an aqueous bath, the trichloroisocyanuric acid and / or Contains dichloroisocyanuric acid or an alkali metal salt thereof and has a pH of 4 or less, characterized in that the treatment bath additionally contains a water-soluble compound, which has at least one exchangeable hydrogen atom bonded to a nitrogen atom.

As water-soluble compounds that have at least one exchangeable, bonded to a nitrogen atom Have hydrogen atom, ammonia, primary or secondary mono- or polyamines are suitable, Alkanolamines, cyclic amines, amino acids, amides, urethanes, urea or dicyandiamide. Particularly polyalkylenepolyamines, glyoxal diurine, 5,5-dimethylhydantoin, 2-monooxyethylamino-4,6-diammo-1,3,5-triazine are advantageously used or water-soluble condensation products of formaldehyde with carbamides such as urea, dicyandiamide, biuret and especially melamine. Of the chlorinated isocyanuric acid products in question, is advantageously the sodium or potassium salt of dichloroisocyanuric acid is used. The salts have opposite the free dichloroisocyanuric acid or trichloroisocyanuric acid a better water solubility and Resistance.

The treatment bath can also contain dispersants to increase the solubility of the water chlorinated isocyanuric acid products, dyes, polymerization products, wetting agents, oxidizing agents, such as per compounds, as well as inorganic salts such as sodium chloride, sodium bromide or sodium sulfate, can be added.

The treatment bath has a pH of 4.5 or less, preferably a pH of 1.5 to 2.5. The temperature is 10 to 50 ° C. The amount of the chlorinated isocyanuric acid product is usually 1 to 10%, preferably 3 to 6 ° / ₀ , based on the weight of the wool, and the amount ίο of the water-soluble compound, which is at least one replaceable , has a hydrogen atom bonded to a nitrogen atom, is generally 1 to 10%, preferably 2 to 5%, based on the weight of the wool. The liquor ratio is generally from 1:30 to 1:60, preferably from 1:40 to 1:50.

The wool finished according to the invention is then treated with a reducing agent, e.g. B. with an alkali bisulfite or alkali thiosulfate.

The treatment bath is produced by

so separate or simultaneous addition of the chlorinated Isocyanuric acid product and the compound, which has at least one exchangeable, to a nitrogen atom has bonded hydrogen atom.

WoIla5 is used as a textile material containing wool sliver, wool yarn, knitted wool or woven fabrics, such as. B. blankets, into consideration.

Wool will have good felt strength at a low pH value and at the same time slow flow achieved according to the following examples:

^. . 1 Λ

Example 1
Yarn 15 minutes at 3O ⁰ C with 24/4

2% sulfuric acid 98% and

0.5 g / l of a 30% solution of a condensation product of 8 to 15 moles of ethylene oxide to 1 mole of a mixture of C ₁₆ -C ₁₈ alcohols, acid-prewashed and rinsed.

The yarn is then treated with a bath at a liquor ratio of 1:40

1 g / l of the above-mentioned ethylene oxide condensate

tion product,

2.25% dimethylol melamine and
5.3% sodium salt of dichloroisocyanuric acid,

corresponding to 3.0% active chlorine.

The bath is adjusted to pH 1.8 with 10% sulfuric acid.

Is one begins with the treatment at 18 ⁰ C, and the temperature within 30 minutes at 25 ° C brought. 5 g / l of sodium chloride are added and the temperature is increased to 35 ° C. over the course of 15 minutes. The temperature is constant for 45 minutes.

For dechlorination, 0.5 g / l of sodium thiosulphate is added to the liquor and, after 15 minutes, the Treatment.

The wool yarn is not yellowed, but remains white. After the yarn felt test of 30 minutes, there was a length shrinkage of + 1.8% compared to -28.5% of the untreated material. The yarn felt samples are tested by pulling the wool strands on a laboratory reel which runs at a constant number of turns of 50 turns / minute. The temperature of the bath containing 5 g / l soap and 0.5 g / l of sodium carbonate is 40 ⁰ C. In addition to the visual evaluation of the felting shrinkage is the length of the conditioned strands

measured, expressed as a percentage of the starting ^length 8 ^e · Example 2

Woolen yarn 24/4 is, as described in Example 1, acid prewashed and with a liquor ratio of 1:40 treated with a bath that

Example 4

Wool yarn 24/4 is pretreated as described in Example 1. One treats at a liquor ratio by 1:40 with a bath that

1 g / l of the ethylene oxide mentioned in Example 1

condensation product,
2.53% dimethylol melamine and
4.40% trichloroisocyanuric acid, corresponding to 3.5%

Active chlorine, pre-dissolved in 40 times the amount

a 5% solution of tetrasodium

pyrophosphate.

The pH of the bath is adjusted to 2.0 _{with 10% H 2} SO _4. It is treated for 15 minutes at 2O ⁰ C, whereupon the temperature is raised in 30 minutes at 35 ⁰ C with the addition of 10 g / l sodium chloride. After a further 45 minutes, the chlorination is complete, after which it is dechlorinated in the usual way with 1% sodium bisulfite solution (in the form of a 40% solution).

The yarn felt sample of 30 minutes shows a length shrinkage of + 0.9% compared to -27.5% of the untreated material.

Example 3

Wool yarn 24/4 is pretreated as described in Example 1. One treats at a liquor ratio of 1:40 with a bath that

2.25% 5,5-dimethylhydantoin and
Contains 5.3% sodium salt of dichloroisocyanuric acid, corresponding to 3.0% active chlorine.

The bath is adjusted to pH 1.8 _{with 10% H 8} SO _4. The treatment and dechlorination are carried out as described in Example 1. A white woolen yarn is obtained whose length shrinkage is + 2%.

1 g / l of the ethylene oxide condensation product mentioned in Example 1,

2.60% oxyethylamino-triazine and

Contains 5.3% sodium salt of dichloroisocyanuric acid, corresponding to 3.0% active chlorine.

The pH of the bath is adjusted to 1.8 _{with 10% H 2} SO _4.

The treatment and dechlorination are carried out as described in Example 1, but with the addition of 10 g Table salt per liter. A white yarn is obtained, the length shrinkage of which is -1%.

Example 5

25 g of woolen sliver, pretreated with acid as described in Example 1, are stuffed into a vertically positioned glass tube (about 2.5 cm in diameter) over a distance of 40 cm. At a constant temperature of 20 ^° C., 1000 ml of chlorination liquor (1:40) according to 1., 2. and 3. of the table below are allowed to flow through in the course of 5 10 minutes. After the anti-chlorine treatment with 0.5 g / l of sodium thiosulfate, and neutralized with 3 g / l of sodium acetate for 15 minutes at 3O ⁰ C, the Wollkammzugproben a staining test are subjected, which is specific for acidic chlorinated wool.

Staining test
Coloration 1:40

1% of a turquoise blue dye, obtainable from

the aminomonophenylamide of Cu-phthalocyanuretetrasulfonic acid, monocyanurated and

converted into a monohalotriazine,
0.5% dinaphthylmethanedisulfonic acid,
5% acetic acid 40%.

You enter at 60 ° C and bring to a boil within 30 minutes. It is then rinsed.

25 g wool sliver with
1000 ml of liquor treated consumption
at
Active chlorine Assessment of the staining test 1. 4.45% potassium salt of dichloroisocyanur 2.42% Strongly unequal; upper part deep coloring; acid, pH 1.8 lower part very light color. Addition of 1.88% dimethylol melamine, pH 1.8 Evenly spreading medium to light Coloring. 2. 4.40% Na salt of dichloroisocyanuric acid, 2.36% Strongly unequal; upper part deep coloring; corresponding to 2.5% active chlorine, pH 1.8 lower part light color. Addition of 1.88% dimethylol melamine 0.90% Evenly spreading medium color. 1.88% 5,5-dimethylhydantoin 0.90% Evenly spreading medium to light Coloring. 2.20% oxyethylaminotriazine 0.82% Evenly spreading medium color. 3. 3.1% trichloroisocyanuric acid, accordingly 2.66% Strongly uneven upper part, deep colouration; 2.8% active chlorine, pH 2.0 lower part light color. Addition of 2.1% dimethylol melamine 1.04% Evenly spreading medium color. 2.1% 5,5-dimethylhydantoin 1.19% Evenly spreading light color. 15% condensed product made of polyethylene 1.51% Somewhat uneven coloring; upper part lenpolyamine and ethylene chloride medium color, lower part light color. Combed wool untreated Even, very light color.

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These experiments show the great advantage of the invention Method by taking at a pH of less than 4 and adding a compound with at least one exchangeable hydrogen atom bonded to nitrogen, uniform colors can be obtained. Without the addition of this aid, uneven colorations will result, which are due to the uneven Are due to chlorination.

Claims (2)

Patent claims: 1. A method for level felting and shrink-proofing of wool-containing textiles by treating with an aqueous bath containing trichloroisocyanuric acid and / or dichloroisocyanuric acid or an alkali metal salt thereof and having a pH of 4 or less, characterized in that the treatment bath is additionally contains a water-soluble compound having at least one replaceable, attached to a nitrogen atom hydrogen atom, and that the treatment comprises temperatures of 10 to 5O ⁰ C and in that the textile is subsequently treated with a sodium bisulfite or sodium thiosulfate. 2. The method according to claim 1, characterized in that the compound, the at least one contains exchangeable hydrogen atom bonded to a nitrogen atom, a water-soluble condensation product of formaldehyde with a carbamide, preferably urea or melamine.