DE2911454A1 - Dyeing of wool with anionic dyes - using tri:methylol-acetaldehyde to reduce fibre damage - Google Patents

Abstract

Dyeing of wool-contg. fibre materials is carried out using anionic dyes in the presence of trimethylolacetaldehyde (I). Process can be used to dye wool or wool/polyamide blends (with anionic dyes alone) or wool/polyester blends (with dispersion and anionic dyes). Addn. of (I) to dye bath reduces fibre damage (esp. loss of tensile strength); redn. is greater than that achieved with N-methylolurea (II).

Description

Process for dyeing wool-containing fiber materials

For dyeing wool and wool / polyamide mixtures with anionic Dyes and of wool / polyester blends with dispersion and anionic Dyes is a process known (DE-OS 27 24 644) in which as a fiber protection agent an optionally etherified N-methylolurea is added to the dyebath for the wool will.

It has now been found that when dyeing wool and wool / polyamide mixtures with anionic dyes and of wool / polyester blends with dispersion and anionic dyes, the fiber damage to wool can be further reduced can if the wool-containing fiber materials with anionic dyes in the presence be colored by trimethylol acetaldehyde.

When carrying out the process according to the invention, the dye liquor usually 0.2 to 15% by weight, preferably 1 to 5% by weight of trimethylol acetaldehyde added. Trimethylolacetaldehyde is a well-known compound and can be used in the context of of the present invention can also be used in the form of their aqueous solution. The rest of the time is dyed as usual. The wool-containing fiber material, i.e. fiber material from pure wool or from mixtures of wool / polyamide or wool / polyester, can available in all processing states, e.g. as yarn, flake, knitted fabric or Fleece. All anionic metal or metal-containing dyes can be used be used for dyeing suitable for wool or synthetic polyamide are. Such dyes can also contain reactive groups that are involved in dyeing react with the substrate. For dyeing the polyester part in wool / polyester blends the known disperse dyes are used. Appropriately come to Dyeing of wool / polyester blends the commercial blends of anionic and disperse dyes are used.

The dye liquors are determined in terms of the amount of dye and other additives prepared as usual. In particular, the pH of the dye liquors is adjusted with acids or acidic salts adjusted to about 2 to 6.5, preferably 4.0 to 5.8. Inorganic and organic acids such as sulfur, Phosphoric, formic, acetic and oxalic acid suitable. Acid reacting salts are e.g. sodium, ammonium acetate or ammonium sulfate. When dyeing wool / polyester blends the liquor can also use dye accelerators (carriers) in quantities of approx. 0.1 to 4 g / l contain. Known carrier-active substances are e.g.

Methyl naphthalene, diphenyl, diphenylene oxide, polychlorobenzenes, benzoic acid esters etc. Furthermore, the dye liquors can use the usual electrolyte leveling, dispersing and / or wetting agents and / or defoamers. The liquor ratio can e.g. 1: 1 to 1: 100. The 0 dyeing temperature can be 60 to 130 0. It is colored until the desired color is achieved. Pure wool can after the exhaust process at temperatures of 60 to 1200C, in particular 95 to 1060C to be colored. Polyester / wool blends can either be without a carrier the HT process at temperatures of over 100 ° C in closed apparatus or be dyed in the presence of carriers at temperatures below 1060C. Usually the material to be dyed is put into an approx. 40 to 5000 warm liquor, which contains all auxiliaries but not the dye and leaves the material approx. 5 to 15 minutes in this fleet. Then the dye is added and the Temperature increased to dyeing temperature. After completion of the dyeing process the staining is completed as usual.

Strong, level dyeings with good fastness properties are obtained.

Compared to the use of N-methylolureas as a wool preservative occurs, especially when dyeing under HT conditions, by the invention The addition of trimethylolacetaldehyde provides better protection for the wool, e.g. manifests itself in a lower loss of tear strength.

Compared to the known addition of formaldehyde, one becomes essential lower odor nuisance achieved.

Example 1 a) 25 g of a wool yarn are in a closed dyeing machine with a liquor containing 1.25 g of calcined Glauber's salt, 0.125 g of a fatty amine polyglycol ether (Commercial product EganalX GE from Hoechst AG, Frankfurt am Main) and 0.75 g of ammonium sulfate in 300 ml of water and adjusted to pH 5.5 with acetic acid, 10 minutes Treated at 0 40 C. Now 0.5 g of the commercial dye CI Acid Blue 213 is used and heats up to 1200C within 30 minutes and colors at this for 30 minutes Temperature.

0 It is cooled to 60 ° C. and rinsed in the usual way. You get one Rub-resistant, level, blue color.

b) Proceed as described under a), but continue with the rest Chemicals and auxiliaries 0.75 g of the N-methylolurea described in DE-OS 27 24 644 a.

c) Proceed as described under b), but instead of the N-methylolurea 0.75 g trimethylol acetaldehyde.

Example 2 The procedure described in Example 1 a) to 1 c) is followed, dyeing however not 30 minutes at 1200C, but 120 minutes.

In examples lb), lc), 2a) to 2c), dyeings are obtained with same coloristic properties as in example la). Compared to the untreated Wool yarn surrendered however, the following loss of tensile strength (in each case Average of 10 individual exams).

a b c Example 1 -39.0% -27.9% -22.2% Example 2 -83.0% -72.7 % -53.1%

Claims (6)

P A T E N T A N S P R Ü C H E 1. Process for dyeing wool-containing Fiber materials with anionic dyes, characterized in that in the presence is colored by trimethylol acetaldehyde. 2. The method according to claim 1, characterized in that in one Float is colored, which contains 0.2 to 15 wt.% Trimethylolacetaldehyde. 3. The method according to claim 1, characterized in that in one Float is colored, which contains 1 to 5 wt.% Trimethylolacetaldehyde. 4. The method according to claims 1 to 3, characterized in that that at temperatures of 60 to 130 0C is dyed. 5. Process according to claims 1 to 4, characterized in that that as wool-containing fiber material polyester / wool mixed fiber material with dispersion and anionic dyes. 6. The method according to claims 1 to 5, characterized in that that dyeing is carried out at temperatures from 100 to 1300C.