SU108810A1 - The method of integration of leather and products from them - Google Patents

Description

The problem of wear (durability) of leather, especially the plantar, is of considerable interest to the leather industry. To improve the durability of leather and products from them, various methods have been proposed, including those based on impregnation (impregnation) of their various resins. However, most of these methods suffer from a number of disadvantages, such as: labor intensiveness and high material consumption with little efficiency.

A method of impregnating leathers and products made from them, devoid of the above disadvantages, i.e., allowing very simple and costly amounts of impregnating material to sushi, is proposed to achieve sush: a natural increase in wear resistance and water resistance. A feature of this method is that polyurethane resins are used for impregnation. In this case, in the case of treatment of the plantar skin, only the subdue part of the cut-out soles is impregnated.

Example. Getting wear-resistant leather soles.

1. Raw ash operations are carried out according to a uniform procedure — the variant with the shortest duration.

2. Further operations prior to pickling are carried out as usual.

3. Pickling; LCD 0.9-1.0; NaCl 55-60.

In 20 minutes. after the start of pickling, chromic extract with a basicity of 40% is given - Consumption of Cr2O3 — at least 1.2% by weight of a mole; the duration of chromium plating before penetration and to obtain a welding temperature of at least RP = 3.8-4.2 for the outer layers and 4.5-5.0 for the inner layers.

4. Flushing and neutralization (optional).

5. Dubing - single phase; LCD 0.8-1.2; temperature is 35-42 °; consumption of tannids 15-17% by weight of the mole; pH of juices - 3.8-4.5; sulfozhir consumption 1%. The duration of tanning with continuous rotation of the drum is 36 hours.

Bouquet of tannins;

a) 100% of syntans: PS, ATP, I ° 4, No. 5;

b) 50% of tanned spruce + 50% of syntan PS. or L 5;

c) 40% willow tannins + 20% tannins of spruce –f– 40% of syntans;

d) 30% of oak tannins + 40% of spruce tannins + 30% of syntans (PS, ATP, No. 4, No. 5).

6. Stroke 24-36 hours.

7. Flush (optional). In case of any skin contamination, it is allowed to rinse them in the drum or other equipment for 1 minute.

8. Pressing, filling and greasing - as usual.

9. Laying and drying.

10. Spraying to a moisture content of 15–18%, aging for 24 hours.

11. Easy polishing or ironing at a pressure of 24-40 atm and 50 - 60 °.

12. Cutting of leather on the part; at the same time, the stretch parts do not impregnate, and the soles are impregnated with a special solution (see below), and only that part of them that is worn, i.e., sweeping. For this purpose, the soles are lowered to the required depth in the impregnation and kept there until the air bubbles are released, which usually takes 15 minutes.

After impregnating, the soles are removed from the solution, the excess impregnate is allowed to drain and dried at ordinary temperature to remove the solvent. Area and thickness, insoles does not change.

The experienced sock of the soles produced in this way and the impregnated soles showed a significant increase in wear, as compared with the soles worked out according to a single technique.

Impregnation with the proposed resins (polyurethanes) can be subjected to the soles produced by any other method, as well as the soles produced by a single technique; in this case, the rises are slightly less. In the case of the impregnation of the soles of pure chrome tanning, their wear rises even more than in the first case.

Preparation of impregnating solution (impregnat)

Technical castor oil is dissolved in turpentine. A solution of toluene diisocyanate in butyl acetate is separately prepared. After dissolution, the components are drained together with good stirring. The mixture is left for four hours, after which the prepared solution is used for impregnation.

, To prepare 1 kg of impregnate, take: toluene diisocyanate. . 95 g

butyl acetate95

castor oil. . . 360 turpentine450

Subject invention

1. A method of impregnating leathers and products made from them with resins, characterized in that polyurethane resins are used to increase wear resistance and water resistance.

2. Acceptance of the method according to and. 1, characterized in that, when treating the sole, only the sub-skid part is impregnated.