SU468973A1 - Method of dyeing natural fur - Google Patents

Description

one

The invention relates to the fur industry, in particular to the method of dyeing natural fur in black.

There is a known method of dyeing natural fur to black by treating it in a weakly alkaline solution (neutralization), washing, dressing with copper-ammonia, then chromic acid compounds, processing with oxidative dyes, washing and finishing.

However, this method does not provide for obtaining deep black color on the fur with a guard hair (rabbit, muskrat, etc.).

In order to obtain a deep black color on the guard hair, a combination of the pasting and diving methods is carried out. The nasal method of dyeing includes three to four times spreads with a mixture of aniline hydrochloride, bertolet salt, copper sulfate, followed by layings for 6–8 hours and parked for 3–4 hours after each spread. After the namaz dyeing is followed by the diving method of dyeing, which consists in the treatment of the hair with a chrome pick and the subsequent dyeing with a mixture of ca: idimensional dyes;

However, this method has a long processing cycle, is laborious, and also has unfavorable working conditions.

The purpose of the invention is to obtain an intensive lightfast coloring on the fur with a guard hair, as well as to simplify the dyeing technology.

To do this, before dressing the fur, it is processed in a bath containing the leucovine of the cubic dye, followed by oxidation and washing.

Dedicated natural fur is neutralized for 1-3 hours at a bath temperature of 38 ° C. The composition of the bath g / l: soda ash 1.5-3; non-ionic surfactant (surfactant), for example, Prevocell, 0.25-0.75.

Then drainage is carried out without discharge from the launch for 1 hour, the first washing in pure water at 38 ° C for 0.5 hour. After that - drain without discharge from the launch for 1 hour, vat dyeing at a bath temperature of 45 ° C for 1 hour with the following bath composition:

Ammonia (25%) mg / l1,5-3,0

Hydrosulfite g / l1,5-3,0

The mother liquor composition: Dye (indigo)

100%), g / l1,5-3

Caustic soda g / l 0.8-1.3

Hydrosulfite g / l 2.5-3.5

Drainage is carried out for 1 hour without discharging the latch pike, then oxidation

at a bath temperature of 35 ° C for 1 hour (the bath contains 1.5-4.0 mg / l of 30% nerhydrol).

Then drain for 1 hour without discharging skins from the longline, washing at a bath temperature of 35 ° C for 1 hour (the composition includes 0.25-0.75 g / l of surfactant — precellar).

Drainage is carried out for 1 hour without discharging the skins from the longline, then pickling (first) at 35 ° C for 2 hours with the following bath composition:

Copper vitriol g / l4.0-6.0

Ammonia (25%) ml / l 12.0-18.0

Surfactant (Prevocell) g / l0.5-1.5

Thereafter, discharge from the sledge, pressing and the second dressing is carried out at a temperature of 35 ° C for 3 hours with the following bath composition: Chrompeak g / l 2.0-4.0 Acetic acid g / l. 2.0-4.0 surfactant (precellar) g / l 0.1-0.3 Salt g / l 20.0-40 Drain without discharging skins from the sledge for 1 hour, then dyeing oxidation at 35 ° С

for 3 hours with the following bath composition: Dye, for example, black for fur D g / l

7.0-9.0

Resorcinol g / l 0.4-0.6 Ammonia (25%) mg / l 1.5-2.5 Perhydrol (30%). ml / l

4.0-8.0

Then it is washed and finishing operations are carried out by known methods.

Subject invention

A method of dyeing natural fur to black color by treating it in a weakly alkaline solution, washing, dressing with copper-ammonia, then chromic acid compounds, processing with oxidative dyes, washing and finishing, characterized in that, in order to obtain an intense, light-fast coloring on the fur hair treatment and simplification of the spraying process, before weeding the fur, process it in a bath containing the leucine compound of the cubic dye, followed by oxidation and washing.