SU1451169A1 - Method of processing fur pelts - Google Patents

Abstract

The invention relates to light industry and allows for an improvement in the quality of the flap skins and the intnsinification. cite the process. Fur sheepskins of acid-salt preservation with thickened leather fabric are subjected to washing, washing and degreasing, and then they are etched and reduced by oxidizing dyes in the presence of sodium hydrosulfite. After dyeing, the skins are peaked, oak t and fattened. Tanning is carried out in a solution containing chromic and aluminum tanning agents masked with sodium phthalate. I zp f-ly, 1 tab. cl

Description

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This invention relates to light industrialization and can be used in fur production when lashing fur skins with thickened leather fabric.

The purpose of the invention is to increase the quality of fur skins and intensify the process.

The essence of the invention is that the etching and dyeing with oxidizing dyes in the presence of sodium hydrosulfite is carried out after degreasing, and tanning is carried out in a solution containing chromium and aluminum tanning agents, masked by sodium phthalate.

Conducting etching and dyeing with oxidative dyes in the presence of sodium hydrosulfite after degreasing provides not only high-quality dyeing of the hairline, but also preparation for tanning significantly degrades the structure of the leather tissue, activates collagen, which makes it possible to pique and shake time

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Fixing the loosened structure of the leather fabric during etching and dyeing contributes to a more rapid achievement of the required temperature for welding the leather fabric and a more uniform introduction of tanning substances, which in turn causes uniformity of properties over all the skin, softness, plasticity and greater yield over the area. Phthalate masked sodium compounds of aluminum and chromium improve the quality of leather and promote its filling, softness and plasticity.

The method is as follows.

The batch of semi-coarse fur sheepskins of acid-salt preservation with thickened leather fabric, is subjected to washing, washing - degreasing according to a single technology of processing fur sheepskins.

Then, pickling is carried out at LC-7 II temperature for 3 hours. For pickling:, use a composition containing, g / l:

Cooking salt 30

Chrompik3

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0

five

0

five

0

five

0

five

0

five

Sulfuric acid (110%) 2

Prevocatell W-OF-100 0.5 B boiling soda solution of sodium chloride, give acid, diluted in 5-fold amount of water, dissolved bichromate, Prevocell W-OF-100 and load sheepskin. Rotation when loading sheepskins 30 minutes, then 10 minutes in each subsequent hour of processing. The residual content in the chromic solution is 1.0-1.5 g / l, sulfuric acid 0.1-0.4 g / l. This is followed by a drain for 1 h, and then dyeing with black oxidative dyes at LC 7 and a temperature for 3 h. Solution composition: Black d / m D, g / l 3.0 Pyrocatechin, g / l 1.5 Ammonia (25%), ml / l 3.0 Sodium hydrosulfite (85%), g / l 0.8

Cooking salt, g / l 30.0 B of the barkas, sodium chloride solution is poured, ammonia, dyes, previously dissolved in 10-fold amount of water, and half of sodium hydrosulfite are given. pH of the solution is 9.0-9.6. Load sheepskin. The other half of sodium hydrosulfite is given after 1 h from the beginning of the dyeing. The rotation of the blades is unalterable.

Stoke - after dyeing for 1 h This is followed by pickling - tanning - greasing at LC 7 and a temperature of 42 C.

Duration: pickeling 4 hours, tanning 5-7 hours. Composition of the solution: Cooking salt, g / l 40.0 Acetic acid (100%), g / l4.0

Chrome tanning agent from the calculation

Contains no chromium oxide, g / l -1.3

Aluminum sulfate at the rate of

alumina content, g / l1,0

Phthalate sodium:

phthalic anhydride, g / l1,0

caustic sodium, g / l 0,5 Fat emulsion:

industrial oil

I-12 A, g / l 14,0

Prevocell W-OP-l00, g / l1,4

Turpentine, ml / l0,7

Urotropin, g / l 0.5

A solution of salt is poured into a boat with sheepskin, give acetic acid, diluted in 10-fold amount of water. After analyzing the content of salt and acid, a solution of chrome tanning with a concentration of 0.3 g / l in terms of chromium oxide is added. Next, add a part of the fat emulsion (I-12 A-5.0 g / l industrial oil, W-OF-100 precella 0.5 g / l) and turpentine 0.25 ml / l. After 4 hours, a solution of chrome tanning containing 1 g / l of oxvda chromium, a solution of aluminum sulfate and sodium phthalate, the rest of the fat emulsion, and turpentine are added.

After 1 h from the onset of tanning, urotropine is added and after 5 h the welding temperature is checked. It should not be below 73 ° C and the pH of the solution, which should be equal to 4, the pH is adjusted with sodium carbonate solution.

The rotation of the blades for 20 minutes when loading and adding materials and I0-20 minutes in each subsequent hour of processing. .. Dry chrome tanning agents are used as chromium compounds, and aluminum sulphate as aluminum compounds. After pickling - tanning - the fattening is followed by a laydown for 2-4 hours and finishing according to a single technology of processing fur sheepskins.

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Data characterizing the quality of sheepskins, processed by the proposed and known methods are shown in the table.

From the above data it can be seen that sheepskins treated according to the proposed method are distinguished by increased tensile strength and firmly Q with the design of the face layer, as well as ductility. The softness of the knife cloth is 0.4 points higher than the softness of the sheepskins, processed by a known method. This makes it possible to increase the yield of sheepskins from raw materials by 1.4%, and the grade by 2%.

The proposed method is characterized by simplicity and manufacturability, allows the processing cycle to be reduced by

20 69.0-77.0 hours compared with izg, st.

F o

rmula of invention

Claims (2)

one . The method of treating fur skins mainly with thickened leather fabric, including washing, washing, degreasing, pickling, tanning, fattening, dressing and dyeing with oxidative dyes in the presence of sodium hydrosulfite, characterized in that, in order to improve the quality of fur skins and intensify the process , pickling and dyeing are carried out after degreasing. 2. The method according to claim 1, characterized by the fact that tanning is carried out in a solution containing chrome and aluminum tanning agents, massed with sodium phthalate. Content unrelated fatty substances,% Strength at stretching, MPa Full extension at voltage 4.9 MPa, Z 19.016.0 26.6 21.8 45.137.4 Strength of the facial layer, MPa Bending elongation,% Color fastness hair coat to dry friction points Softness, points (by rating) Output square sheepskins from - raw materials,% Grade,% of grade raw materials Duration of treatment h, excluding master, washing and degreasing and finishing operations Table continuation 16.4 105.9 12.3 88.6 3.4 74.8 81.9 49.5-118.5- -56.5 -133.5,