DE1794412C1 - Process for coloring acrylic fibers - Google Patents

Description

The dyeing and printing of synthetic fibers on the basis of polymers or copolymers Acrylonitrile is generally done with the help of basic dyes, more soluble in plastics Dyes or metal complex dyes.

In order to be fixed with a maximum of color yield, certain dyes make the application elevated temperatures required, such as steam treatment under pressure at 105-140 ° C or heat setting with hot air at 140 to 200 ° C.

In order to be able to work in lighter conditions, one gives the printing pastes and dye baths Solvents, propellants or carriers, such as certain glycols, phenylmethylcarbinol, urea, Thiourea, formamide, dimethylformamide, dimethyl sulfoxide, methyl ethyl ketone, y-butyrolactone, Alcoyl phthalate, adiponitrile, suberonitrile, nitrophenols, nitromethane, ethylene glycol carbonate or Sodium perchlorate too. These auxiliary products make it possible to determine the duration or level of the temperature of the Lower heat setting. However, the results obtained are not satisfactory in all cases. Certain auxiliaries are few in the case of certain classes of dyes, such as metal complex dyes effective. In addition, a considerable number of these auxiliaries are volatile under the conditions of use, leads to spots or color irregularities on the fibers or reduces their dynamometric properties Resilience.

From the Belgian patent 5 55 356 a process for dyeing polyacrylonitrile fibers with basic dyes, metalized dyes free of sulfo groups and disperse dyes known, in which, as an aid, it contains certain CN groups bonded to nitrogen via an alkylene bridge Connections are used. But even these aids are not very effective.

It has now been found that the following compound

HO-CH ₂ CH ₂ -S-CH ₂ CH (Ch ₃ ) CN (I)

a valuable tool for dyeing and printing fibers based on polymers or copolymers of acrylonitrile.

With the help of this connection, the vividness and the color yield can be improved and at the same time the Conditions of use can be alleviated by shortening the fixing time and lowering the temperature can be.

The dyeings obtained are of good uniformity and have improved fastness properties in humid conditions. With the help of the above compound you will get good results with a larger number of dyes, such as metal complex dyes and acidic dyes,

ίο received. The thermosetting can take place at higher Temperature can be carried out without the risk of premature volatilization. the The mechanical qualities of the fibers are largely retained. It is also possible to use this connection better white or colored discharge prints on colored or difficult to etch ground to obtain.

The invention therefore relates to a method for coloring fibers on the basis of polymers

ao and copolymers of acrylonitrile, in which in Presence of a compound of formula (I) plastic-soluble dyes, metal dyes, basic ^ Dyes and modified basic dyes, acidic ^ P Dyes, vat dyes and optical brighteners

as can be applied to the fibers.

The compound of formula (I) has a swelling effect on the fibers, behaves compared to the above-mentioned dyes as a carrier and has partially dissolving properties in relation to these dyes. It also has the effect of improving the diffusion of molecules in the polymers or copolymers.

The auxiliary used in the process according to the invention is added to the dye baths or printing pastes. Its concentration can vary within wide limits, for example for printing from 0.5-25%, based on the total weight of the printing paste, and for dyeing from 5 to 200 g / l, preferably from 50 to 100 g / l, of the dyebath . The compound used in the present process can flj in the presence of Anteigmitteln, dispersing agents, surface active agents and various aids generally used for dyeing and printing

be applied.

The dyes are fixed in a manner known per se, for example by dyeing under Pressure, steam treatment with or without pressure or heat setting with hot air.

The invention also relates to the use of the compound of the formula (I) for the production of etching pastes.

The following example illustrates the invention. Parts are parts by weight.

example

A printing paste is made from the following components from:

3 parts of l-methylamino-4-y? -Hydroxyäthylamino-

anthraquinone

5 parts of a condensation product of 1 mol of 2-mercaptoethanol and 1 mol of methacrylonitrile [HO - CH ₂ CH ₂ --S - CH ₀ CH (CH ₃ ) - CN]
37 parts of water at 50 ° C

55 parts of a thickener based on 33% synthetic resin

100 parts

3 4

This paste is printed with the help of a roller-drier. A blue tint is obtained, whose

Printing machine on a polyacrylonitrile fabric. In terms of color strength and liveliness are superior to those

After drying, the fabric is treated for 15 minutes, which in the absence of the above-mentioned condensation

ten at 105 ° C with steam. One rinses, washes and sation product can be obtained.

Claims (2)

Patent claims: 1. Process for dyeing fibers based on acrylonitrile polymers or copolymers, in which plastic-soluble dyes, metal dyes, basic dyes, modified basic dyes, acidic dyes, vat dyes or optical brighteners in the presence are brought into action by dyeing auxiliaries, characterized in that the compound the formula HO-CH ₂ CH ₂ -S-CH ₂ CH (Ch ₃ ) CN (I) used. 2. Use of the compound of formula (I) of claim 1 in etching agents for printing of polyacrylonitrile fiber material.