DE1045970B - Process for dyeing and printing textile material made of polyacrylonitrile and / or acrylonitrile-containing copolymers - Google Patents

Description

Process for the dyeing and printing of textile material made from polyacrylonitrile and / or acrylnitriihaltigen copolymers has been found that deep in a simple manner dyes with cationic dyes on overall form of Polyacry1nitril and / or acrylonitrile-containing copolymers obtained when weak in the dye solutions or printing pastes to moderately strong oxidizing agents are also used.

Oxidizing agents suitable for the process are for example the alkali, alkaline earth and heavy metal salts of halogenated acids and the oxygen acids of the metals of the fifth to seventh subgroup of the periodic table, also the alkali metal and alkaline earth metal hexacyanoferrate (11I) and the alkali metal and alkaline earth metal salts aromatic nitrosulfonic and nitrocarboxylic acids. They are already exercising their effect ii; smaller amounts (e.g. 0.01 to 10%), but if desired also in larger amounts which are advantageous depending on the type and concentration of the dye, the type of material to be dyed and, if necessary, the steaming conditions.

The use of weak to moderately strong oxidizing substances in dye baths or printing pastes of cationic dyes leads to a substantial increase in the Color strength when dyeing textile material such as fibers, flakes, threads, fabrics or Spun from pure polyacrylonitrile or from copolymers of acrylonitrile for example with vinyl chloride, vinylidene chloride, vinyl fluoride, vinyl acetate and propionate, vinyl pyridine, vinyl imidazole, vinyl alcohol, acrylic acid esters, methacrylic acid esters, Acrylic acid amides and / or methacrylic acid amides. The new one shows particular advantages Process in film printing, in which the subsequent steaming is best done with little (0.1 to 0.2 atmospheres), if necessary also at medium overpressure (0.2 to 2.0 atmospheres). Of course, the other common dyeing auxiliaries - including those described in patent application 39339 IVc / 8m are mentioned - also use if they are used against weakly to moderately strong oxidising agents Means are persistent.

The parts mentioned in the examples are parts by weight.

Example 1 With one as in example 1 of patent application B 39339 IVc / 8m, but using 20 parts of 25% aqueous sodium chlorate solution The paste prepared is printed on fabric made from a copolymer of 94 parts of acrylonitrile and 6 parts of methyl methacrylate using a stencil, dry it and dampens it in a star damper for 30 minutes. After the usual rinsing and soaps very strong, deep blue prints are obtained without the use of an oxidizing agent obtained prints have only a low color depth.

Example 2 10 parts of a mixture of 4 parts of the basic dye of the formula 6 parts of the sodium salt of a condensation product of naphthalenesulfonic acid and formaldehyde are dissolved in a mixture of 20 parts of thiodiglycol, 20 parts of 50% acetic acid and 100 parts of water and 20 parts of β- (N-formyl) -amino-propionitrile are added to the solution . A printing paste is then prepared by adding 700 parts of crystal rubber, 30 parts of 10% strength aqueous potassium dichromate solution and 136 parts of water. It is used to print long-thread fabric made of pure polyacrylonitrile with the aid of a film printing stencil and then steamed for 15 minutes at 1.0 atmospheric pressure in a steaming kettle. After the usual work-up, deep blue prints are obtained.

Example 3 As described in Example 1 of patent application B 39339 IVc / 8m t., 4 parts of the basic dye of the formula using 40 parts of 10% aqueous solution of the sodium salt of 1-nitrobenzene-3-sulfonic acid, a printing paste is produced and printed with its fabric made from a copolymer of 40 parts of acrylonitrile and 60 parts of vinyl chloride using a film printing stencil. The fabric 20 is dampened! Minutes at 0.1 atmospheres overpressure in a star damper, it was rinsed and soaped, giving it strong, violet prints.

Example 4 30 parts of fabric made from a copolymer of 94 parts of acrylonitrile and 6 parts of methyl methacrylate in; a about 60 ° C warm bath of 1 part of the dye mentioned in Example 1, 3 parts of sodium dichromate, 0.5 parts of concentrated sulfuric acid and 5 parts of sodium sulfate in 1000 parts Water a. Then the temperature of the dyebath increases within 20 minutes 90 ° C and increased to 100 ° C within a further 30 to 40 minutes; this temperature is maintained for 1 hour. After the usual work-up, you get a depth of color, clear blue colors.

Example 5 0.6 part of the dye described in Example 2 is dissolved and then 2 parts of sodium nitrite and 6 parts of sodium sulfate in 1000 parts Addition of acetic acid to a pH of 4.5 water. With the thus obtained Solution are 50 parts of strand yarn from the copolymer mentioned in Example 1 dyed using a spray dyeing machine, setting the dyeing temperature quickly to 85 ° C and then increased to 100 ° C within 40 minutes and then this temperature maintains it for another 40 to 50 minutes. This gives a deep blue-violet coloration.

Claims (1)

PATENT CLAIM: Process for dyeing and printing textile material made of polyacrylonitrile and / or acrylonitrile-containing copolymers with cationic ones Dyes, characterized in that the dye baths or printing pastes weakly to moderately strong oxidizing agents are also used.